Calendar mechanism, movement and timepiece.

专利摘要:
The invention relates to a calendar mechanism which can be constituted in a simple manner, which can avoid the application of a load on a wheel and which can automatically achieve a catch of date at the end of February at a time in a normal year and in a leap year. A calendar mechanism (10) includes a short month calendar drive wheel (25) that rotates one turn in one day about a first axis (C1); a date indicator (50), which has an end-of-month finger (53) and rotates one turn in one month; as well as a short month forward advancement finger (35) which is provided on the short month calendar drive wheel (25), which rotates in synchronism with the short month calendar drive wheel (25); 25) while being moved, which pushes the end-of-month finger (53) to rotate the date indicator (50) by a first angle on the last day of a short month other than February among the short months in each of which the number of months is equal to or less than 30 days, which pushes the end-of-month finger (53) to rotate the date indicator (50) by a second angle larger than the first angle on the last day of a February of a leap year and pushing the end-of-month finger (53) to rotate the date indicator (50) by a third angle larger than the second angle on the last day of the month February of a normal year. The invention also relates to a movement and a timepiece comprising such a calendar mechanism.
公开号:CH714690A2
申请号:CH00241/19
申请日:2019-02-27
公开日:2019-08-30
发明作者:Mori Yuichi
申请人:Seiko Instr Inc；
IPC主号:

专利说明:

Description
BACKGROUND OF THE INVENTION
1. Field of the invention The present invention relates to a calendar mechanism, a movement and a timepiece.
2. Description of the Related Prior Art [0002] In a timepiece with a calendar that can display a calendar and a month, it is known to provide a calendar mechanism which advances two calendars so as to minimize the correction. from date to the end of a short month that is thirty days or less.
For example, Japanese patent no. 4,624,848 (patent document 1) described below provides a calendar mechanism comprising a planetary gear mechanism having a satellite unit of months which has five drive teeth and a set of fixed planetary teeth which is coaxial with a slider date indication and which has a direct training relationship with the month satellite unit.
In addition, the article by Soichiro MATSUZAKI in "Chronos, Japanese version", Simsum Media Co., Ltd., February 3, 2011, pages 114 to 115 (non-patent document 1), described below, provides a mechanism calendar comprising a control cam, a month indicator locking shaft which is operated by the control cam, a month indicator locking arm finger, a date finger, as well as a month star (month indicator) and a date indicator arranged so as to be coaxial with each other.
[0005] In addition, there is a calendar mechanism in which an advancement of four dates takes place at the end of February in a normal year, in which an advancement of three dates takes place at the end of a month of February of a leap year and in which an advancement of two calendar days takes place at the end of a short month other than the month of February (for example, see Soichiro MATSUZAKI, in "Chronos, Japanese version", Simsum Media Co., Ltd., February 3, 2011, pages 108 to 111 (non-patent document 2)). The non-patent document 2 describes a calendar mechanism comprising a main lever, a 24-hour wheel claw provided for tilting the main lever once a day, a 48-month cam provided for changing the tilt angle of the main lever. by the wheel claw 24 hours a month, as well as a date indicator turning at least one tooth per day under the action of the main tilting lever. In the calendar mechanism described in non-patent document 2, a projection provided to rotate the date indicator by one tooth per day on the end of the tilting by the 24-hour wheel claw, as well as a lever for main claw to make an additional rotation to the date indicator according to the tilting angle of the main lever at the end of the short months equips the main lever.
However, in the prior art described in patent document 1, the constitution is complicated due to the planetary gear mechanism employing several gears. In addition, in the prior arts described in patent document 1 and in non-patent document 1, since the date advance is two calendar days at the end of the short months, it is necessary to manually perform an additional date advance every year at the end of February. In addition, in the prior art described in the non-patent document 2, since the main lever is tilted every day, the load applied to the gear train causing the 24-hour wheel claw can be increased by an amount which is that required for flip the main lever.
SUMMARY OF THE INVENTION One aspect of the present invention is to provide a calendar mechanism which can be constituted in a simple manner, which makes it possible to avoid the application of a load to a gear train and which can automatically carry out a date catch-up at the end of February both in a normal year and in a leap year, as well as a movement and a timepiece.
According to the present application, a calendar mechanism is proposed comprising a calendar drive wheel for a short month which rotates by one revolution in one day around a predefined axis; a date indicator which has an end-of-month finger and which rotates one turn in a month; and a short month calendar advancement finger which equips the short month calendar drive wheel, which rotates in synchronism with the short month calendar drive wheel while being moved, which pushes the end finger of months so as to rotate the date indicator by a first angle on the last day of a short month other than February from among the short months in each of which the number of days is less than or equal to 30 days, which pushes the end of month finger so as to rotate the date indicator by a second angle larger than the first angle on the last day of February in a leap year and which pushes the end of month finger so as to rotate the date indicator by a third angle larger than the second angle on the last day of February in a normal year.
According to the present invention, without the need to use a complicated planetary gear mechanism as described in the related prior art, it is possible to constitute a calendar mechanism with a simple constitution comprising a date drive wheel for short month, a calendar advancement finger for month
CH 714 690 A2 short, as well as a date indicator with an end of month finger. In addition, the date advancement finger for short month pushes the end of month finger so as to rotate the month indicator by a first angle on the last day of a short month other than February among short months, each of which has a number of days less than or equal to 30 days, and it pushes the end of month finger so as to rotate the date indicator by a second angle larger than the second angle the last day of February in a leap year, so that the number of calendar catch-up dates performed at the end of February in a leap year is greater than the number of calendar catch-up dates carried out at end of a short month other than February. In addition, the date advancement finger for short month pushes the end of month finger on the last day of February in a normal year so as to rotate the date indicator by a third angle larger than the second angle. Consequently, the number of calendar catch-up dates performed at the end of February in a normal year may be greater than the number of calendar catch-up dates performed at the end of February in a leap year . Consequently, the date catch-up at the end of February, which is carried out manually in the related prior art, can be carried out automatically both in a normal year and in a leap year. In addition, the date advancement finger for short month pushes the end of month finger on the last day of the short month so as to rotate the date indicator, so that the period over which there is an increase of the load applied to the gear train driving the date driving wheel for short month provided with the date advancement finger for short month can take place only on the last day of the short month. Therefore, it is possible to propose a calendar mechanism which can be constituted in a simple manner, which makes it possible to remove the application of a load on the gear train and which can automatically carry out a date correction at the end of February even in both a normal and a leap year.
In the calendar mechanism, it is preferable that the calendar mechanism further comprises a month cam which is coaxial with the calendar drive wheel for a short month and which rotates by one revolution in a year; a year cam which is carried by the month cam so as to be rotatable; a drive mechanism that rotates the cam for years relative to the cam for months; and a short month calendar advancement lever which includes a sliding contact portion coming into sliding contact with an outer peripheral surface of the month cam and an outer peripheral surface of the year cam, which is provided so as to be rotatable relative to the date wheel for short months and which rotates around the month cam in synchronism with the date wheel for short months, while the external peripheral surface of the month cam comprises several first protruding portions which each correspond to one month among the short months other than February, and a second protruding portion which corresponds to February and which is larger than the first protruding portions in a circumferential direction around the predefined axis, while the outer peripheral surface of the years cam includes a third projecting portion ie, while when looking in the axial direction of the predefined axis, the third protruding portion extends the second protruding portion in February of a normal year and is moved out of the position extending the second portion in protrusion in February of a leap year, due to the rotation of the years cam by the drive mechanism, while the date advancement finger for short month equips the date advancement lever for short month, and while the short month advance lever causes the short month advance finger to be engaged with the month end finger, being in sliding contact with the first protruding portions on the last day of the month. one month among the short months other than February, causes the calendar advancement finger for the short month to be engaged with the month-end finger, while being in sliding contact with the has the second protruding portion on the last day of February in a leap year and causes the calendar advancement finger for the short month to be engaged with the month-end finger, while being in sliding contact with the second portion protruding and the third protruding portion on the last day of February in a normal year.
According to the present application, when the sliding contact portion of the date advancement lever for the short month is in sliding contact with any protruding portion among the first protruding portions, the second protruding portion and the third protruding portion, the date advancement lever for the short month can be moved relative to the state where the sliding contact portion is not in sliding contact with any of the protruding portions. The second protruding portion is larger than the first protruding portion in the circumferential direction around the predefined axis. Consequently, the duration during which the sliding contact portion is in sliding contact with the second protruding portion and during which the calendar advance lever for short month is thus moved is longer than the duration during which the contact portion sliding is in sliding contact with any of the first protruding portions and during which is moved the date advance lever for short month. Therefore, the length of time the short month advance lever causes the short month advance finger to be engaged with the month finger on the last day of February is longer than the length of time the short month advance lever causes the short month advance finger to be engaged with the month finger on the last day of a short month other than February.
In addition, when looking from the axial direction of the predefined axis, the third protruding portion extends the second protruding portion in February of a normal year and is moved out of the position extending the second portion in protrusion in February of a leap year, so that in February of a normal year, the duration during which the date advancement lever for a short month is moved relative to the state where the sliding contact portion does not is in sliding contact with any of the protruding portions is longer than in February of a leap year. Consequently, the duration for which the date advancement lever for the month runs brings the date advancement finger
CH 714 690 A2 for short month to be engaged with the end of month finger on the last day of February of a normal year is longer than the period during which the date advance lever for short month brings the calendar advance finger for the short month to be engaged with the month-end finger on the last day of February in a leap year.
It follows that the date advance finger for short month can push the month end finger to rotate the date indicator of the second angle larger than the first angle on the last day of February d '' a leap year, and the number of calendar days of the catch-up carried out at the end of February in a leap year may be higher than the number of calendar days of the catch-up carried out at the end of a short month other than the February. In addition, the date advancement finger for the short month can push the end of month finger so as to rotate the date indicator by a third angle larger than the second angle on the last day of February d 'a normal year, and the number of days of catch-up at the end of February in a normal year may be higher than the number of days of catch-up carried out at the end of February of a leap year. Therefore, it is possible to propose a calendar mechanism which is able to automatically catch up at the end of February even a normal year and also a leap year.
In the calendar mechanism, it is preferable for the drive mechanism to rotate the cam for years intermittently.
According to the present application, it is possible to have a period during which the years cam is stopped relative to the months cam. Therefore, it is possible to place the years cam in a predetermined rotating position at the end of February compared to the case where the years cam rotates continuously. Therefore, it is possible to reliably perform the date catch at the end of a short month, by moving the date advancement lever for the short month with the desired trajectory.
In the calendar mechanism, it is preferable that the date drive wheel for the short month includes a degree adjustment rod which regulates the pivoting range of the advance lever for the date for the short month.
According to the present application, the range on which the date advance lever for the short month can be pivoted is defined. Consequently, it is possible to prevent the advance lever for the date for the short month from accidentally touching another component. Therefore, problems can be prevented from arising in various mechanisms including the calendar mechanism.
In the calendar mechanism, it is preferable that the month-end finger includes a pushing portion which comes into contact with the calendar advancement finger for a short month to push, in a direction away from the finger. at the end of the month, the calendar advancement finger for the short month rotating in synchronism with the calendar drive wheel for the short month.
According to the present application, the date advancement finger for the short month can be pushed in a direction away from the end of month finger. Consequently, it is possible to move the calendar advancement finger for short month away from the end of month finger during a month (a long month whose number of days is 31 days) other than a short month, without using a reminder device intended to recall the calendar advancement finger for a short month in the direction of removal of the end of month finger. Therefore, it is possible to avoid malfunctions of the calendar mechanism.
A movement according to the present application comprises a calendar mechanism as defined above. In addition, a timepiece according to the present application comprises the movement as defined above.
According to the present application, the calendar mechanism which can be constituted simply, which can avoid the application of a load on the gear train and which can automatically carry out a date catching up at the end of February even as well a normal year than a leap year, so it is possible to offer a movement and a timepiece which are excellent in terms of reliability and convenience.
According to the present application, it is possible to propose a calendar mechanism which can have a simple constitution, which makes it possible to avoid the application of a load on the train and which can automatically carry out a date catching up with the end of February including both a normal year and a leap year, as well as a movement and a timepiece.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a plan view of a timepiece, a movement and a calendar mechanism according to one embodiment.
Fig. 2 is a plan view of a date advancement mechanism according to the same embodiment.
Fig. 3 is an exploded view showing the shapes of a month cam and a year cam.
CH 714 690 A2
Fig. 4 is a plan view showing a rotational position of the years cam relative to the months cam.
Fig. 5 is a plan view showing a rotational position of the year cam relative to the month cam.
Fig. 6 is a plan view showing a Maltese cross mechanism.
Fig. 7 is a plan view of a month advancement mechanism according to the above-mentioned embodiment.
Fig. 8 is a block diagram illustrating the power transmission path in the calendar mechanism according to the above-mentioned embodiment.
Fig. 9 is a view explaining a change of state of the calendar mechanism according to the above-mentioned embodiment.
Fig. 10 is a view explaining a change of state of the calendar mechanism according to the above-mentioned embodiment.
Fig. 11 is a view explaining a change of state of the calendar mechanism according to the above-mentioned embodiment.
Fig. 12 is a view explaining a change of state of the calendar mechanism according to the above-mentioned embodiment.
DESCRIPTION OF THE EMBODIMENTS In the following, an embodiment of the present invention will be described with reference to the drawings.
Generally, a device body comprising the drive part of the timepiece is called a "movement". The state of the finished product obtained by fitting the movement with a dial, hands or the like, and placing the movement in a timepiece box is called a "complete timepiece". Among the two sides of the plate forming a frame of the timepiece, the side with the crystal of the timepiece case, i.e. the side with the dial is called the back side of the movement . In addition, among the two sides of the plate, the side with the bottom of the timepiece box, i.e. the side opposite the dial, is called the front side of the movement. Further, in the following description, the clockwise direction is called the clockwise direction and the counterclockwise direction is called the counterclockwise direction on each plan views in fig. 1 and the following figures.
[0027] FIG. 1 is a plan view of a timepiece, a movement and a calendar mechanism according to the above-mentioned embodiment. Fig. 1 is a plan view obtained when looking from the rear side of a movement 100. Furthermore, in FIG. 1, each component of constitution is seen as if one saw through a dial 2, for practical reasons.
As shown in fig. 1, a timepiece 1 is provided with a dial 2 comprising an indicator indicating information relating to time or the like. The timepiece 1 is provided with an hour hand (not shown) indicating the hours, a minute hand (not shown) indicating the minutes and a second hand (not shown) indicating the seconds.
In addition, the timepiece 1 has a month 4 display area and a date 6 display area.
The month display area 4 includes a month display window 4a placed between a position approximately six hours from the timepiece and the center of the timepiece 1. For example, the timepiece watchmaking 1 displays a month to a user by exposing, in view, in the month display window 4a, the letters indicating the month (for example, the letters “FEB” representative of the month of “February” in FIG 1) present on a month 5 display disc.
The date display area 6 is located over a range from approximately 12 hours to 6 hours. The timepiece 1 has a date hand 7 indicating the date. Timepiece 1 displays the date to a user by making the date hand 7 indicate one of the characters "1" to "31" present on the dial 2.
The movement 100 has a winding stem 8 and a crown 9 placed at a distal end of the winding stem 8. The movement 100 allows a correction of the date and the month so that the crown 9 is pulled towards the outside with respect to a timepiece box 1 a, then is turned in a predefined direction so as to rotate a date indicator 50 and a month indicator 80 (both described below) and be able to correct the date and the month.
The movement 100 has a calendar mechanism 10. The calendar mechanism 10 has a date advancement mechanism 20 and a month advancement mechanism 60. In the following, the mechanism will be described in detail. calendar 10 with the date advancement mechanism 20 and the advancement mechanism
CH 714 690 A2 of month 60, referring to the respective drawings. In addition, the calendar mechanism 10 of the embodiment is a mechanism conventionally called a perpetual calendar which automatically performs a calendar advance on February of a normal year until the first calendar and automatically performs a calendar catch-up on February of a leap year until the first calendar day. In addition, a normal year is a year that is not a leap year and the last calendar day of February is 28.
Date advancement mechanism [0034] FIG. 2 is a plan view of the date advancement mechanism according to the embodiment.
As shown in fig. 2, the date advancement mechanism 20 mainly comprises an hour wheel 21, a date driving wheel for short month 25, a date advancement lever for short month 30, a month cam 27, a cam from the 28s, a Maltese cross mechanism 90 (corresponding to what is called a "drive mechanism" in the appended claims), a date indicator drive wheel 40, a date indicator 50 and a jumper date 56.
The hour wheel 21 is rotated by a power transmitted from a power source (not shown) which is housed inside the timepiece box 1a, such as a motor or a movement barrel, for example. The hour wheel 21 rotates around a predetermined axis, in a clockwise direction. For example, the rotation of the hour wheel 21 is transmitted to the short month calendar drive wheel 25, via a gear train such as a minute wheel 22 or an intermediate date indicator 23.
The date drive wheel for short month 25 includes a small date drive gear for short month 25a which meshes with an intermediate date indicator pinion 23a of the intermediate date indicator 23. The wheel calendar drive for short month 25 rotates on a first axis C1 (corresponding to what is called "predefined axis" in the appended claims) counterclockwise, at the rate of one revolution per day (i.e. in 24 hours). The month cam 27 is provided at a central axis of the short month calendar wheel 25, so as to be coaxial with and relatively rotatable with respect to the month calendar wheel short 25. As will be described later in detail, since the cam for months 27 completes a revolution in December, the cam for months 27 rotates according to a different cycle from that of the date drive wheel for short month 25.
The date advance lever for short month 30 is provided on the date drive wheel for short month 25. The date advance lever for short month 30 is placed so as to extend along of an outer edge of the date wheel for the short month 25 and has a general shape of a substantially circular arc. The short month calendar advancement lever is secured to the short month calendar drive wheel 25 at a position overlapping the month cam 27 and the year cam 28 in a direction orthogonal to the axial direction of the first axis C1. The short month calendar advancement lever 30 rotates around the month cam 27 in synchronism with the short month calendar drive wheel 25. In addition, the expression “in synchronism” means that several elements are moving. simultaneously and covers both the case in which the elements have the same angle of rotation and the case in which their angles of rotation are different.
The date advance lever for short month 30 comprises a main lever body 31 which is carried by the date drive wheel for short month 25 so as to be rotatable on an axis parallel to the first axis C1, a shank 33 which extends from a base end of the main lever body 31, in a direction opposite to the main lever body 31, a sliding contact finger 34 (corresponding to what is called the sliding contact portion in the appended claims), which projects from a distal end of the main lever body 31, as well as a date advancement finger for short month 35. The main lever body 31 extends from the center of rotation, clockwise around the first axis C1. The tail 33 extends from the base end of the main lever body 31, counterclockwise around the first axis C1. The tail 33 is formed so as to be shorter than the main lever body 31. The tail 33 is in abutment against a degree 37 adjustment rod (described below), from the outside of the wheel. calendar drive for short month 25 in a radial direction.
The sliding contact finger protrudes from the distal end of the main lever body 31, towards the inside of the short month calendar drive wheel 25, in a radial direction. The sliding contact finger 34 is capable of being in sliding contact with an external peripheral surface of the cam for months 27 and an external peripheral surface of the cam for years 28.
The date advancement finger for short month 35 protrudes from the distal end of the main lever body 31, towards the outside of the date drive wheel for short month 25, according to a radial direction. The short month advance finger 35 presses on an end of month finger 53 (described below) disposed on the date indicator 50, so as to rotate this date indicator 50. The date lever for short month 30 rotates around the first axis C1 counterclockwise, one revolution per day, in response to a rotation of the calendar drive wheel for short month 25. Although details will be supplied later, it is now indicated that the date advancement finger for short month 35 rotates while being moved inward and outward in a radial direction.
CH 714 690 A2 The date drive wheel for short month 25 is equipped with the degree adjustment rod 37. The degree adjustment rod 37 touches the tail 33 of the date advance lever for short month 30, from inside the calendar drive wheel for short month 25, in a radial direction. The degree adjustment rod 37 determines one end of the angular travel of the date advance lever for the short month 30. In other words, the degree adjustment rod 37 prevents the main lever body 31 of the lever from 'advancement of date for short month 30 moves outward of the date drive wheel for short month 25, in a radial direction, beyond a predefined stroke.
The month cam 27 rotates on the first axis C1, counterclockwise, step by step, at a step of 30 ° per month, and rotates one turn in one year. The month cam 27 is coaxial with the month indicator 80 (see fig. 1) and rotates in synchronism with the month indicator 80.
FIG. 3 is an exploded view showing the shapes of the month cam and the year cam.
As shown in fig. 3, several protruding portions 27a to 27e are disposed at an external peripheral surface of the month cam 27. The protruding portions 27a to 27e of the month cam 27 are formed respectively in positions corresponding to the short months ( February, April, June, September and November) each of which has 30 days or less than 30 days when the external peripheral surface of the cam for months 27 is divided into 12 portions around the first axis C1 and successively dedicated to the months of the year , from January to December clockwise. The bottoms between the protruding portions 27a to 27e are formed in positions corresponding to the long months, each of which has 31 days. In addition, the protruding portions 27a to 27e consist of first protruding portions 27b to 27e corresponding to the months (April, June, September and November) other than the month of February among the short months and a second protruding portion 27a corresponding to the month of February.
The first projecting portions 27b to 27e are formed so as to become thinner from the inside towards the outside of the calendar drive wheel for short month 25 in a radial direction, in a plan view ( see fig. 2). The first protruding portions 27b to 27e include vertices provided at the ends of the date drive wheel for short month 25 on the outside in the radial direction. The vertices of the first protruding portions 27b to 27e are in the form of cylindrical surfaces around the first axis C1. The top of the first protruding portion 27b is formed so as to face a finger portion 55 of the month-end finger 53 in a position corresponding to the thirtieth day of April (see fig. 2). This applies to the first protruding portions 27c to 27e.
The second projecting portion 27a is formed so as to be larger than the first projecting portions 27b to 27e in the circumferential direction around the first axis C1. The second projecting portion 27a is formed so as to become thinner from the inside to the outside of the short month calendar drive wheel 25 in a radial direction, in a plan view. The second protruding portion 27a includes a top at one end of the short month calendar drive wheel 25, outward in a radial direction. The top of the second projecting portion 27a is in the form of a cylindrical surface around the first axis C1. A radius of curvature of the apex of the second protruding portion 27a is equal to the radius of curvature of the apexes of the first protruding portions 27b to 27e. The dimension of the apex of the second protruding portion 27a in the circumferential direction around the first axis C1 is larger than each of the dimensions of the apexes of the first protruding portions 27b to 27e in the circumferential direction around the first axis C1. The apex of the second protruding portion 27a is formed so as to correspond to the finger portion 55 of the month-end finger 53 at a position corresponding to a period going from the 29 ^th day to the 30 ^th day of February.
The bottoms between the projecting portions 27a to 27e are in the form of cylindrical surfaces around the first axis C1. Each of the funds is formed so as to be opposite the finger portion 55 of the month-end finger 53 at a position corresponding to the period going from the 28 ^th day to the 30 ^th day of each corresponding month (long month).
The cam of the 28 years is carried by the cam of the months 27 so as to be rotatable. The cam of the 28 years performs revolutions around the first axis C1 in synchronism with the cam of the months 27 and rotates relative to this cam of the months 27. The cam of the 28 years is provided between a position corresponding to the months of February and March of the outer peripheral surface of the month cam 27 and the first axis C1 when looking in the axial direction of the first axis C1. The external peripheral surface of the cam from the 48s is provided with three protruding portions which are third protruding portions 28a. The third projecting portions 28a are provided at three of the four zones into which the cam of the years 28 is divided and which are distributed around the axis of rotation of this cam of the years 28. In the following, among the four division zones, the three zones where the third protruding portions 28a are located are respectively called the protruding zones and the single region where there is no third protruding portion 28a is called the non-protruding zone.
Figs. 4 and 5 are plan views showing angular positions of the year cam with respect to the month cam. Furthermore, in FIGS. 4 and 5, a shading coincides with the cam of the 28s.
As shown in fig. 4, in a state where a protruding area is positioned outside the month cam 27 in a radial direction relative to the axis of rotation of the year 28 cam, the year 28 cam is such that a third protruding portion 28a extends the second protruding portion 27a of the month cam 27, when viewed in the axial direction of the first axis C1. This third protruding portion 28a is located downstream of the second
CH 714 690 A2 protruding portion 27a of the month cam 27, clockwise around the first axis C1, when it extends the second protruding portion 27a of the month cam 27 when viewed according to the axial direction of the first axis C1. In addition, as shown in fig. 5, in a state where the protruding area is outside the month cam 27 in a radial direction relative to the axis of rotation of the 28 year cam, the 28 year cam is formed so to be completely covered by the month cam 27 when looking in the axial direction of the first axis C1. In other words, in a state where the zone without projection is outside the cam of the months 27 in a radial direction relative to the axis of rotation of the cam of the years 28, the cam of the years 28 is such that the third protruding portions 28a are moved back out of the position extending the second protruding portion 27a of the month cam 27, when looking in the axial direction of the first axis C1. In February of a normal year, the third protruding portion 28a of the cam for years 28 extends the second protruding portion 27a of the cam for months 27, when looking in the axial direction of the first axis C1. In addition, in February of a leap year, the third protruding portions 28a of the cam of years 28 are moved out of the position extending the second protruding portion 27a of the cam of months 27, when we look at the axial direction of the first axis C1.
As shown in fig. 4, each third protruding portion 28a comprises a top located at one end on the outside of the cam of the years 28 in a radial direction. In a state where a third protruding portion 28a extends the second protruding portion 27a of the month cam 27 when viewed in the axial direction of the first axis C1, the top of this third protruding portion 28a extends along a arcuate shape with the same center as the top of the second protruding portion 27a of the month cam 27. In a state where the apex of a third protruding portion 28a is aligned with the second protruding portion 27a of the cam month 27 when looking in the axial direction of the first axis C1, the apex of the third protruding portion 28a is continued by the apex of the second protruding portion 27a. In other words, the top of a third projecting portion 28a is formed so as to be opposite the finger portion 55 of the month-end finger 53 in a position corresponding to the 28 ^th calendar of the month of February d 'a normal year.
As shown in fig. 3, the Maltese cross mechanism 90 intermittently rotates the cam from the 28s. The Maltese cross mechanism 90 comprises a finger wheel 91 and a Maltese cross cam from the 95s. The finger wheel 91 and the Maltese cam crosses from the 95s are placed in the same position in the axial direction of the first axis C1. The finger wheel 91 is placed on the first axis C1. The finger wheel 91 is fixed to a support element (for example to the plate, to the gear train, or the like (not shown)) in order to support the cam for months 27 in rotation. In other words, the month finger 91 rotates around the first axis C1 in a relative manner with respect to the month cam 27. An external peripheral surface of the finger wheel 91 comprises an arc segment 92 extending in an arc shape around the first axis C1 when looking in the axial direction of the first axis C1, as well as a advancement finger of the cam from the 93s which is placed between the two ends of the arc segment 92 and which projects in a direction orthogonal to the first axis C1.
The Maltese cross of the cam of the 95s is linked to the cam of the 28s. The Maltese cross of the cam of the 95s is coaxial with the cam of the 28s and fixed to this cam of the 28s. in other words, the Maltese cross of the years 95 is supported by the cam of the months 27 so as to be rotatable and turns around the first axis C1 in synchronism with the cam of the months 27. For example, the Maltese cross of cam from the 95s and the 28s cam are arranged on opposite sides with the 27s cam interposed therebetween. The 95's Cam Maltese Cross has four teeth 96. The four 96 teeth are arranged at regular angular intervals around the axis of rotation of the 95's Cam Maltese cross. A distal end of each tooth 96 is formed with a distal end surface 96a capable of being in sliding contact with the arc segment 92 of the finger wheel 91. The distal end surface 96a of each tooth 96 extends in an arc shape having a diameter identical to that of the arc portion 92 of the finger wheel 91 when looking in the axial direction of the first axis C1.
The Maltese cross of the 95's cam turns around the first axis C1 in synchronism with the cam of the months 27 while allowing the distal end surface 96a of a tooth 96 to be in sliding contact with the portion in arc 92 of the finger wheel 91. In a state where the distal end surface 96a of a tooth 96 is in sliding contact with the arc portion 92 of the finger wheel 91, the rotation of the Maltese cross of cam of the 95s compared to the cam of the 27 months is prevented. In a state where any of the protruding portions 28a of the cam for years 28 extends the second protruding portion 27a of the cam for months 27 when viewed in the axial direction of the first axis C1, the Maltese cross of cam from the 95s is linked to the cam from the 28s so that the distal end surface 96a of a tooth 96 is in sliding contact with the arc portion 92 of the finger wheel 91.
FIG. 6 is a plan view showing the Maltese cross mechanism. Furthermore, in FIG. 6, a state before the Maltese cam cross of the 95s is engaged with the cam advancement finger of the 93 is shown in phantom in two points.
As shown in fig. 6, the 95's Cam Maltese Cross engages once with the 93 Cam advancement finger during a 360 ° revolution made by it. When the Maltese Cam Cross of the 95s is engaged with the 93 cam advancement finger, the 95s cam rotates 90 ° with respect to the 27 months cam while continuing its revolution. Then, the teeth 96 of the Maltese cross of the years 95 in sliding contact with the arc segment 92 of the finger wheel 91 are switched. Therefore, the
CH 714 690 A2 Maltese cross mechanism 90 allows the cam from the 28s (see fig. 3) linked to the Maltese cross from the 95s cam to rotate 90 ° with each 360 ° rotation of the cam of the 27 months.
As shown in fig. 2, the date advance lever for the short month 30 rotates around the first axis C1 in a state where the sliding contact finger 34 is able to be in sliding contact with the external peripheral surface of the month cam 27. The distal end of the short month calendar advancement finger 35 is positioned on the outermost side of the short month calendar drive wheel 25 in a radial direction, in a state where the calendar finger sliding contact 34 is in sliding contact with the top of one of the projecting portions 27a to 27e of the cam for months 27 or with the top of the third projecting portion 28a of the cam of years 28. Furthermore, the distal end of the short month calendar advancement finger 35 is positioned on the innermost side of the short month calendar drive wheel 25 in a radial direction, in a state where the contact finger slides ssant 34 is in sliding contact with the bottoms between the projecting portions 27a to 27e. Consequently, the month cam 27 causes the short month calendar advancement finger 35 to move inward and outward in a radial direction of the short month calendar drive wheel 25, response to the rotation of the date advance lever for short month 30 rotating in synchronism with the date drive wheel for short month 25. In the following, a position in which the date advance finger for short month 35 is on the innermost side of the short month calendar wheel 25 in a radial direction is called an "innermost position", while a position in which the finger short month calendar advancement 35 is on the outermost side of the short month calendar drive wheel 25 in a radial direction is called a "most outside ".
The rotation of the date drive wheel for short month 25 is transmitted to the date indicator drive wheel 40, via a date transmission wheel 24, for example. The date indicator drive wheel 40 rotates one revolution per day (that is to say in 24 hours) counterclockwise, on an axis different from the first axis C1.
A date finger 42 is disposed on the date indicator drive wheel 40. The date finger 42 has a spring portion 43 having a circular arc shape in a plan view, as well as a portion contact 45 disposed at a distal end of the spring portion 43. The date finger 42 is arranged so as to be covered by the date indicator drive wheel 40 in a plan view. The date finger 42 is integral with the date indicator drive wheel 40 and rotates in synchronism with this date indicator drive wheel 40. The spring portion 43 is elastically deformable in the direction circumferential and in the radial direction of the date indicator driving wheel 40. The contact portion 45 rotates around the central axis of the date indicator driving wheel 40 due to the rotation of this date indicator drive wheel 40 and thus pushes on the date indicator teeth 51 to rotate the date indicator 50.
The date indicator 50 has the shape of a disc and on the outer peripheral edge of the latter, the teeth of date indicator 51 are formed. The date indicator teeth 51 have 31 teeth formed with a step of 360731 = approximately 11.6 ° and corresponding to 31 days which represent the number of days in a long month. The date indicator teeth 51 are pushed once a day by the contact portion 45 of the date finger 42 which rotates one revolution per day. Consequently, the date indicator 50 rotates step by step, around a second axis C2, clockwise, one step per day having the same angle as the angular step (of approximately 11.6 °) of the date indicator gear 51, and performs one turn in one month (that is to say in 31 days).
The date indicator 50 has the month end finger 53. The month end finger 53 is provided in the same position as the date advance lever for short month 30 along the axial direction of the first axis C1. The month-end finger 53 extends in a radial direction of the date indicator 50. The distal end of the month-end finger 53 forms the finger portion 55 which tapers from the inside towards the outside of the date indicator 50 in a radial direction in a plan view. A lateral surface 55a (corresponding to what is called the "thrust portion" in the appended claims) on the finger portion 55, which is turned downstream with regard to a rotation in the counterclockwise direction of a shows around the second axis C2, is inclined towards the outside of the date indicator 50 in the radial direction. The distal end of the finger portion 55 is configured so as to pass inside a rotation path of the calendar advancement finger for short month 35 in its outermost position when the indicator date 50 is in a position corresponding to the period from the 28 ^th day to the 30 ^th day.
For example, when the finger portion 55 is positioned opposite the month cam 27 on the last day of a month (for example in the state shown in FIG. 2), the advancement finger of date for short month 35 of the date advancement lever for short month 30 which is in its outermost position can come into contact with the lateral surface 55a of the finger portion 55. At this instant, in the case where the sliding contact finger 34 of the date advance lever for the short month 30 is in sliding contact with the top of one of the projecting portions 27a to 27e of the month cam 27 or else with the top of the third protruding portion 28a of the cam for years 28, the finger portion 55 and the date advancement finger for short month 35 are engaged since the date advancement finger for short month 35 is prevented from moving towards the inside the date drive wheel e for short month 25 in the radial direction. Consequently, the date indicator 50 is pushed by the advancement finger
CH 714 690 A2 calendar for short month 35 rotating with the calendar drive wheel for short month 25 and turning. Furthermore, in a case where the sliding contact finger 34 of the date advance lever for the short month 30 is not in sliding contact with the top of one of the protruding portions 27a to 27e of the month cam 27 or with the apex of the third protruding portion 28a of the cam of the years 28, the lateral surface 55a of the finger portion 55 pushes, towards the center of the cam of the months 27, the calendar advancement finger for months short 35 which comes into contact with the lateral surface 55a. Consequently, the date advancement finger for short month 35 avoids the finger portion 55 and does not engage with this finger portion 55.
The date jumper 56 is in abutment against the date indicator 50. The date jumper 56 is a component intended to adjust the position of the date indicator 50 in rotation. The date jumper 56 comprises a portion forming a date jumper spring 58, the distal end 57 of which is a free end and which is elastically deformable. The distal end 57 of the date jumper spring portion 58 can be engaged with the date indicator teeth 51. The date jumper 56 regulates the rotation of the date indicator 50 by the fact that the distal end 57 is engaged with the date indicator teeth 51. Consequently, the date indicator 50 can rotate step by step, one step per day having the same angle as the angular step (of approximately 11.6 °) of the date indicator teeth 51.
Month advancement mechanism [0065] FIG. 7 is a plan view of the month advancement mechanism according to the embodiment.
As illustrated in FIG. 7, the month advancement mechanism 60 mainly comprises a date cam 61, a hammer 70, a date hand wheel 67, the month indicator 80, a month jumper 86, as well as a reminder 78.
The date cam 61 is in synchronism with the date indicator 50 and rotates one revolution in a month (that is to say in 31 days) clockwise, around of the second axis C2. The outer peripheral surface of the date cam 61 forms a cam surface 62 which is formed in the form of a spiral so that its radius gradually increases in the counterclockwise direction. The cam surface 62 has an outermost portion 63 whose distance from the second axis C2 is a maximum separation distance. The cam surface 62 has an innermost portion 64, the distance of which from the second axis C2 is a minimum separation distance.
The hammer 70 has, as a whole, an L shape by a portion forming a follower 71 and a portion forming a main lever body 73. A connection portion between the follower 71 and the main lever body 73 in the hammer 70 serves as a pivot portion 72 and is supported so as to be rotatable and to go back and forth around a predetermined axis.
The follower 71 is formed so as to have a distal end which curves towards the cam surface 62 of the date cam 61.
Opposite the pivot portion 72, one end of the main lever body 73 is fan-shaped and has an edge at which a lever toothing 74 is formed. The lever toothing 74 meshes with the calendar hand wheel 67.
The hammer 70 is connected to the return wheel 78, by means of the calendar needle wheel 67. The hammer 70 is biased clockwise around the pivot portion 72, by the return wheel 78. Consequently, the follower 71 is pushed against the cam surface 62 of the date cam 61 and it is in sliding contact with the date cam 61 by the rotation of this date cam 61.
The follower 71 of the hammer 70 is moved relatively when it is in sliding contact with the cam surface 62, in response to the rotation of the date cam 61.
When the follower 71 is at the innermost portion 64, the hammer 70 is in a position in which it is tilted as far as possible clockwise around the axis of the pivot portion 72. In what follows, the position where the hammer is tilted as far as possible clockwise is called the "initial position". In addition, when the follower 71 is at the outermost portion 63, the hammer 70 is in a position in which it is tilted as far as possible counterclockwise around the axis of the pivot portion 72. In what follows, the position in which the hammer 70 is tilted as far as possible counterclockwise is called the "final position". In fig. 7, the hammer 70 in its initial position is shown in phantom in two points while the hammer 70 in its final position is shown in solid line. Here, as mentioned above, the date cam 61 rotates one turn in a month. Consequently, the hammer 70 performs a round trip between the initial position and the final position once a month.
A month advancement finger 75 is disposed on the main lever body 73. The month advancement finger 75 is provided between the pivot portion 72 and the lever teeth 74. The advancement finger of month 75 is formed so as to project towards the month indicator 80 disposed on the side opposite to the date cam 61 relative to the main lever body 73. The month advancement finger 75 is worn so as to be pivotable on an axis of
CH 714 690 A2 predetermined pivoting, relative to the main lever body 73. The month advancement finger 75 pushes and turns the month indicator 80 on the last day of each month.
In addition, a leaf portion forming a spring 76 is formed at a central portion of the main lever body 73 so as to extend in an extension direction of the main lever body 73. The portion in leaf spring 76 is resiliently deformable as a whole, while one end on the side of the lever teeth 74 is fixed to the main lever body 73 and the other end on the side of the pivot portion 72 is a free end . The blade portion forming a spring 76 urges the month advancing finger 75 counterclockwise around the pivot axis, while the other end is in abutment against a finger portion of advancement of month 75.
The lever teeth 74 of the hammer 70 meshes with the calendar needle wheel 67. The calendar needle wheel 67 is connected to the calendar needle 7 (see FIG. 1), thereby rotating this date hand 7. When the hammer 70 is in the initial position, the date hand wheel 67 is in a state where it is turned as far as possible counterclockwise. At this time, the date hand 7 indicates "1" among the numbers ranging from "1" to "31" on dial 2 to indicate the dates. In addition, when the hammer 70 is in the final position, the date hand wheel 67 is in a state in which it is turned as far as possible clockwise. At this time, the date hand indicates "31" among the numbers ranging from "1" to "31" on dial 2 to indicate the date. Consequently, the date hand 7 is maneuvered one step every day in response to the rotation of the date cam 61 and the movement of the hammer 70.
In addition, the follower 71 of the hammer 70 is instantly moved from its outermost position 63 to its innermost position 64, by a biasing force of the return wheel 78 and the hammer 70 is moved from its final position to its initial position, so that the date hand wheel 67 pivots very rapidly in the anticlockwise direction. At the same time, the date hand 7 very quickly rotates anti-clockwise and it is instantly switched from a state of indication of the number "31" present on the dial to indicate the date by one state of indication of the number "1". Consequently, the date hand 7 is moved back and forth over a fan shape at the date display area 6.
The month indicator 80 is arranged on the side opposite to the date cam 61 relative to the hammer 70, so as to be rotatable around the first axis C1. The month indicator 80 is disc-shaped and, at its outer peripheral edge, there is a month indicator toothing 81. The month indicator toothing 81 has twelve teeth formed with a pitch of 30 ° corresponding to twelve months which represent the number of months in a year. The month indicator toothing 81 is pushed once by the month advancing finger 75 disposed on the hammer 70, when the hammer 70 moves from its final position to its initial position. The hammer 70 makes a round trip once a month. Consequently, the month indicator teeth 81 are pushed once a month by the month advancing finger 75.
The month jumper 86 is in abutment against the month indicator 80. The month jumper 86 is a component provided for adjusting the position of the month indicator 80 in rotation and comprises a portion forming a jumper spring of month 88, the distal end 87 of which is a free end and which is elastically deformable. The distal end 87 of the month jumper spring portion 88 can be engaged with the month indicator toothing 81. The month jumper 86 controls the rotation of the month indicator 80 by the fact that the distal end 87 is engaged with the month indicator teeth 81. Consequently, the month indicator 80 rotates step by step around the first axis C1, with a step of 30 ° per month counter-clockwise of a watch and performs a tour in one year.
In addition, the month display disc 5 (see fig. 1) is arranged on the month indicator 80. The month display disc 5 is arranged so as to be coaxial with the indicator of month 80 and to cover the indicator of month 80 and it rotates in synchronism with this indicator of month 80. Characters from “JAN” (January) to “DEC” (December) which indicate each month are present on a surface of the month 5 display disc so as to be distributed with a pitch of 30 ° clockwise.
The return wheel 78 is connected to the hammer 70 via the calendar needle wheel 67 and biases the hammer 70 towards the month indicator 80. The return wheel 78 has a portion forming a spring in a spiral 79 at a portion of central space, while a main body 78a has an annular shape, for example. One end of the spiral spring 79 is fixed to the gear train (not shown) of the timepiece 1 and the other end of the spiral spring 79 is connected to the main body 78a of the return wheel 78. The spring in spiral 79 is coaxial with the return wheel 78 and it is in the form of a spiral in the anticlockwise direction so as to extend along an Archimedes curve, for example. The return wheel 78 rotates anti-clockwise, causing the spiral spring 79 to decrease in diameter and be deformed elastically.
The hammer 70 moves from its initial position to its final position, thereby rotating the return wheel 78 anticlockwise, by means of the calendar needle wheel 67. Consequently, a biasing force is accumulated in the spiral spring 79 of the return wheel 78 so as to rotate this return wheel 78 clockwise. Furthermore, immediately after the hammer 70 has reached its final position and the follower 71 has passed the outermost portion 63 of the date cam 61, the biasing force of the spiral spring 79 is released and the return wheel 78 rotates very quickly clockwise. Consequently, the hammer 70 can instantly move from its final position to its initial position.
CH 714 690 A2
Operation [0083] FIG. 8 is a block diagram showing the power transmission path within the calendar mechanism according to the embodiment. In fig. 8, an arrow shown in solid lines indicates the direction of the power transmission, while an arrow shown in broken lines indicates a positioning maneuver and a double line indicates a state of coaxial union.
Now we will describe an operation of the calendar mechanism described above. In the description which follows, reference is made to FIGS. 1 to 8 for the reference numbers of the constituents of the calendar mechanism 10. In addition, in what follows, an operation of the calendar mechanism 10 will be described in the case where the date becomes the first day of the following month from first day of a month until the last day.
As shown in fig. 8, the power supplied by a power source (not shown) such as a motor or a movement barrel is transmitted to the calendar drive wheel for short month 25, via a gear train such as the hour wheel 21, minute wheel 22 and intermediate date indicator 23. Consequently, the short month calendar drive wheel 25 rotates around the first axis C1 in an anticlockwise direction, at a speed of one revolution per day. In addition, the short month calendar advancement finger 35 mounted on the short month calendar drive wheel 25 rotates around the first axis C1 counterclockwise at a speed of one. revolution per day, synchronized with the calendar drive wheel for short months 25.
In addition, the power transmitted to the calendar drive wheel for short month 25 is transmitted to the calendar indicator drive wheel 40, via the calendar transmission wheel 24 meshing with the short month calendar drive wheel 25. Therefore, the calendar indicator drive wheel 40 rotates counterclockwise at a speed of one revolution per day. In addition, the date finger 42 disposed on the date indicator drive wheel 40 rotates counterclockwise at a speed of one revolution per day, in synchronism with the watch wheel. calendar indicator drive 40.
After coming into abutment against the date indicator teeth 51 of the date indicator 50 by rotation, the contact portion 45 of the date finger 42 pushes the date indicator teeth 51 with the time passing by. In addition, the time at which the contact portion 45 of the date finger 42 abuts against the date indicator teeth 51 of the date indicator 50 is generally set to a predetermined time before midnight when the date is changed ( for example between 11 p.m. and midnight, i.e. 0 a.m. the next day). Then, if the date indicator teeth 51 are pushed by the contact portion 45 of the date finger 42 and are turned clockwise by a predetermined angle, the distal end 57 of the jumper date 56 and date indicator teeth 51 temporarily disengage from each other and are engaged with each other again. Therefore, the date indicator 50 rotates clockwise, at a predetermined angular step per day, and rotates one revolution in a month.
In addition, the date cam 61, which is linked to the date indicator 50 and which rotates in synchronism with this date indicator 50, rotates step by step clockwise, from one step a day, and turns one turn in a month.
Here, the follower 71 is moved relatively from the innermost portion 64 to the outermost portion 63 due to the rotation of the date cam 61, and thus displaces the hammer 70 from the initial position (position corresponding to the first day of the month) to the final position (position corresponding to the last day of the month). Consequently, the date needle wheel 67 meshing with the lever teeth 74 of the hammer 70 rotates clockwise, one step per day. In addition, the date hand 7 linked to the date hand wheel 67 is operated by an amount corresponding to one day, at midnight when the date is changed, in response to the rotation of the hand of the calendar 67. As described above, the calendar mechanism 10 operates the calendar hand 7 step by step from the first day to the last day of the month.
So, when the date is changed from the last day of the month to the first day of the following month, the calendar mechanism 10 operates the date hand 7 as explained below.
First, an operation for a long month will be described.
[0092] In the case of a long month, the last day is the ^31st day, advancing end of the month is performed only by the indicator driving wheel of calendar 40. Specifically, date finger 42 disposed on the wheel of calendar indicator drive 40 engages the toothing of indicator calendar 51 to rotate the indicator 50 of a calendar not the ^31st day of a month long. In other words, it is necessary to prevent the date advancement finger for the short month 35 from acting on the finger portion 55 of the end of month finger 53 over the period from the 28 ^th day to the 30 ^th day. a month long.
FIG. 9 is a view which explains a change of state of the calendar mechanism according to the embodiment and which is a plan view representing a state of part of the date advancement mechanism on the 28 ^th day of a long month .
CH 714 690 A2 As shown in fig. 9, the month cam 27 is such that a bottom is positioned at a region opposite the center of the date indicator 50 on the external peripheral surface in the long month. Therefore, the finger of advancement of calendar months for short 35 is recessed in its position most to the inside by the month cam 27, the ^28th day to the ^30th day, and with the passage of time, rotates without engaging the month-end finger 53. Consequently, the date indicator 50 is stopped in a state where its position is fixed by the date jumper 56 without being pushed by the date advancement finger to short month. In addition, the date cam 61 rotating in synchronism with the date indicator 50 is also stopped without rotating.
Then, after having come into abutment against the date indicator teeth 51 of the date indicator 50 by rotation, the date finger 42 disposed on the date indicator drive wheel 40 pushes on the date indicator teeth 51 with the passage of time. Then, if the date indicator teeth 51 are pushed by the contact portion 45 of the date finger 42 and are turned clockwise by a predefined angle, the distal end 57 of the jumper date 56 and date indicator teeth 51 are temporarily released from each other and are engaged with each other again. Consequently, the date indicator 50 and the date cam 61 rotate by one step at a predefined angular step. Therefore, the needle of dates 7 is switched from the ^31st day to the ^1st day and is thus operated by an amount corresponding to one day.
Operation for a short month other than February will now be described.
In the case of a short month among the short months other than the month of February, since the last day is the 30 ^th day, the advancement of the end of month calendar is carried out both by the wheel d date indicator drive 40 and by the date drive wheel for short month 25. More specifically, on the 30 ^th day of a short month other than February, the date advancement finger for month short 35 engages the date portion 55 of the month-end finger 53 in order to rotate the date indicator 50 by one step, and the date finger 42 disposed on the indicator driving wheel date 41 engages the date indicator teeth 51 to rotate the date indicator 50 by one step. In other words, the date advancement finger for short month 35 is avoided with respect to the finger portion 55 of end of month finger 53 and the date advancement finger for short month 35 is engaged with the portion of the finger 55 of the 53 month-end finger to rotate the indicator 50 of a calendar not the ^30th day of the period from the ^28th day to the ^29th day of a month short one short month other than February.
[0098] FIG. 10 is a view which explains a change of state of the calendar mechanism according to the embodiment and which is a plan view showing a state of part of the date advancement mechanism on the 30 ^th day of a short month other than February.
As shown in fig. 10, the month cam 27 is such that the apex of a first protruding portion associated with the corresponding months among the first protruding portions 27b to 27e is opposite the finger portion 55 of the end-of-month finger 53 in a position corresponding to the 30 ^th day in a short month other than February. Therefore, the finger of advancement of calendar months for short 35 is recessed into the innermost position by the month cam 27 on the ^28th day and the ^29th day, and it is placed in the position further outside by the cam for 27 months on the 30 ^th day. When the date indicator 50 is in the position corresponding to the 30 ^th day, the finger portion 55 of the month-end finger 53 has entered inside the trajectory of the date advancement lever for short month 30 in the outermost position. Consequently, after having come into abutment against the end of month finger 53 by the rotation of the calendar drive wheel for short month 25, the date advancement finger for short month 35 pushes the finger portion 55 end of month finger 53 to rotate the date indicator 50 by a first angle with the passage of time. The time when the date advancement finger for short month 35 abuts against the finger portion 55 of the end of month finger 53 is generally set to a predefined time before midnight when the date is changed (for example between 9 pm and 10 p.m.). In addition, the moment when the date advancement finger for the short month 35 abuts against the finger portion 55 of the end of month finger 53 can be adjusted in any way by changing the angular adjustment of the date finger 42 (that is to say by adjusting the position of the contact portion 45 of the date finger 42) and the angular adjustment of the date advancement finger for short month 35.
In the embodiment, the date advancement finger for the short month 35 abuts against the finger portion 55 of the end of month finger 53 at a predefined time before midnight, but the advancement finger of calendar for short month 35 can also come into abutment against the finger portion 55 of the end-of-month finger 53, for example, between one hour and three in the morning.
Then, if the end of month finger 53 is pushed by the date advancement finger for short month 35 and that the date indicator 50 rotating in synchronism with the end of month finger 53 is turned in the clockwise by a predetermined angle, the distal end 57 of the date jumper 56 and the date indicator teeth 51 are temporarily released from each other and are again engaged l with each other. Consequently, the date indicator 50 and the date cam 61 rotate by one step at a predetermined angular step. Consequently, the date hand 7 passes from the 30 ^th day to the 31 ^st day and is thus operated by an amount corresponding to one day.
CH 714 690 A2 [0102] In addition, after having come into abutment against the teeth of the date indicator 51 of the date indicator 50 due to the rotation, the date finger 42 disposed on the drive wheel d the date indicator 40 pushes on the date indicator teeth 51 with the passage of time. Therefore, similar to what happens on the last day of a long month as described above, the date indicator 50 and the date cam 61 rotate at a predetermined angular step. Therefore, the needle of dates 7 is switched from the ^31st day to the ^1st day and is thus operated by an amount corresponding to one day.
In the case of a short month other than February, the operation described above causes the date indicator 50 and the date cam 61 to rotate two steps in one day at a predefined angular step . In other words, this operation causes the needle 7 of dates to be switched from the ^30th to the ^1st calendar calendar causing that the ^31st calendar is passed quickly.
The operation during the month of February of a leap year will now be described.
In the case of February in a leap year, since the last day is the 29 ^th day, the advancement of the month-end calendar is carried out both by the indicator driving wheel. date 40 and by the date driving wheel for short month 25. More specifically, the date advancement finger for short month 35 engages with the finger portion 55 of the end of month finger 53 to rotate the indicator of 50 calendar two not the ^29th day of February in a leap year, and the date finger 42 provided on the driving wheel of 40 calendar indicator engages the teeth indicator of date 51 to rotate the date indicator 50 by one step.
[0106] FIG. 11 is a view which explains a change of state of the calendar mechanism according to the embodiment and which is a plan view showing a state of part of the date advancement mechanism on the 29 ^th day of February d 'a leap year.
As shown in FIG. 11, the month cam 27 is such that the top of the second protruding portion 27a is opposite the finger portion of the month-end finger 53 in a position corresponding to the period from the 29 ^th day to the 30 ^th day of February. Therefore, the finger of advancement of calendar months for short 35 is placed in its outermost position by the month cam 27 on Day ^29. In addition, the finger portion 55 of the month-end finger 53 is on the trajectory of the date advance lever for short month 30 which is in its outermost position when the date indicator 50 is placed in a position corresponding to the period from the 29 ^th day to the 30 ^th day. Here, the apex of the second protruding portion 27a is longer than the dimension of the apexes of the first protruding portions 27b to 27e in the circumferential direction around the first axis C1. Consequently, the date advancement finger for short month 35 is placed in its outermost position over a longer period of time than in the case described above for a short month other than February. . Consequently, after having come into abutment against and engaged with the month-end finger 53 on the 29 ^th day by the rotation of the calendar drive wheel for short month 25, the date advancement finger for month short 35 pushes on the finger portion 55 of the month-end finger 53, with the passage of time, to rotate the date indicator 50 by a second angle greater than the first angle mentioned above.
When the month-end finger 53 is pushed by the date advancement finger for the short month 35 and the date indicator 50 rotating in synchronism with the month-end finger 53 rotates from the second angle in the clockwise, uncoupling between the distal end 57 of the date jumper 56 and the date indicator teeth 51 and re-engagement of the distal end 57 of the date jumper 56 and the teeth date indicator 51 with each other are repeated twice. Consequently, the date indicator 50 and the date cam 61 rotate by two steps having a predefined angular value. Therefore, the needle of dates 7 is operated by an amount corresponding to two days from the ^29th day to the ^31st day.
In addition, after having come into abutment against the date indicator teeth 51 of the date indicator 50 due to the rotation, the date finger 42 provided on the date indicator driving wheel 40 pushes on the date indicator teeth 51 with the passage of time. In a similar manner to that which occurs at the end of a long month as described above, the date indicator 50 and the date cam 61 rotate by a step having a predefined angular value. Therefore, the date hand 7 passes the ^31st day ^1st day and is thus operated by an amount corresponding to one day.
In the case of February in a leap year, the operation described above results in the date indicator 50 and the date cam 61 rotating by three steps having a predefined angular value, in one day. In other words, this operation causes the date hand 7 to pass from the 29 ^th day to the 30 ^th day and to the 31 ^st day, causing rapid advancement, and to pass to the first calendar.
Operation in February of a normal year will now be described.
[0112] In the case of February a normal year, since the last day is the ^28th day, the progress of month-end calendar is made by both an indicator of the drive wheel date 40 and by the date drive wheel for short month 25. More precisely, the date advancement finger for short month 35 engages with the finger portion 55 of the end of month finger 53 to rotate three steps the date indicator 50 and the date finger 42 provided on the date indicator drive wheel 40 engages
CH 714 690 A2 with the teeth of 51 calendar indicator to turn a no indicator calendar 50, the ^28th day of February of a normal year.
[0113] FIG. 12 is a view which explains a change of state of the calendar mechanism according to the embodiment and which is a plan view showing a state of part of the date advancement mechanism on the 28 ^th day of February d 'a normal year.
As shown in FIG. 12, the month cam 27 is such that the top of the second protruding portion 27a is opposite the finger portion 55 of the month-end finger 53 in the position corresponding to the period from the 29 ^th day to the 30 ^th February day. In addition, the year cam 28 is such that the top of the third projecting portion 28a is in front of the portion of finger 55 of end finger month 53 in the position corresponding to the 28 ^th day of February of a normal year. Consequently, the date advancement finger for short month 35 is placed in its outermost position by the cam of the years 28. In addition, the finger portion 55 of the end of month finger 53 is placed on the trajectory of the date advance lever for the month runs 30 in the outermost position when the date indicator 50 is placed in the position corresponding to the period going from the 28 ^th day to the 30 ^th day. Here, the apex of the second protruding portion 27a is longer than the dimensions of the apexes of the first protruding portions 27b to 27e in the circumferential direction around the first axis C1. In addition, the apex of the third protruding portion 28a extends the apex of the second protruding portion 27a when viewed in the axial direction of the first axis C1. Consequently, the date advancement finger for short month 35 is placed in its outermost position over a longer period of time than in the case of February in a leap year. Consequently, after having come into abutment against and engaged with the month-end finger 53 due to the rotation of the calendar drive wheel for the short month 25 on the 28 ^th day, the date advancement finger for short month 35 pushes on the finger portion 55 of the month-end finger 53 and rotates the date indicator 50 by a third angle greater than the second angle mentioned above, with the passage of time.
If the end of month finger 53 is pushed by the date advancement finger for short month 35 and the date indicator 50 rotating in synchronism with the end of month finger 53 rotates from the third angle in the clockwise, uncoupling between the distal end 57 of the date jumper 56 and the date indicator teeth 51 and re-engagement of the distal end 57 of the date jumper 56 and the teeth date indicator 51 with each other are repeated three times. Consequently, the date indicator 50 and the date cam 61 rotate by three steps by a predefined angular value. Therefore, the calendar needle 7 is operated by an amount corresponding to three days passing from the 28 ^th day to 31 ^th day.
In addition, after having come into abutment against the date indicator teeth 51 of the date indicator 50 due to the rotation, the date finger 42 provided on the date indicator driving wheel 40 pushes on the date indicator teeth 51 with the passage of time. Therefore, in a similar manner to what occurs on the last day of a long month as described above, the date indicator 50 and the date cam 61 rotate by a step of a predefined angular value. Therefore, the needle 7 passes of dates the ^31st day ^1st day and is thus operated by an amount corresponding to one day.
In the case of February in a normal year, the operation described above leads to the date indicator 50 and the date cam 61 rotating four steps by a predefined angular value in one day. In other words, this operation causes the date hand 7 to pass from the 28 ^th day to the 29 ^th day, to the 30 ^th day and to the 31 ^st day by causing rapid advancement.
[0118] Then, the cam 61 calendar turns a step on the ^31st day of a month long, turns throw the ^30th day of a month other than short-February, three turns not 29 ^th day of February in a leap year or turns four steps on the 28 ^th day of February in a normal year, thus causing the follower 71 of the hammer 70 to go beyond the most the outside 63 of the date cam 61. Furthermore, after the follower 71 has gone beyond the outermost portion 63, the hammer 70 is instantly moved from its final position to its initial position, by a biasing force produced by the return wheel 78 (see the dashed line at two points in fig. 7). Consequently, the follower 71 of the hammer 70 is moved relatively to the innermost portion 64 of the date cam 61.
At this instant, in the case of the last day of a long month, in response to the movement of the hammer 70 from the final position to the initial position, the date hand wheel 67 instantly turns in the opposite direction to the Clockwise. Consequently, the date hand 7 linked to the date hand wheel 67 instantly moves from the position indicating "31" on the last day to the position indicating "1" on the first day.
In addition, in the case of the 30 ^th day of a short month other than February, in the calendar hand wheel 67, in response to the rotation of a step of the date indicator 50 and the date cam 61 caused by the month-end finger 53, the hammer 70 reaches the final position. At the same time, the date hand wheel 67 rotates one step clockwise. In addition, the date hand 7 linked to the date hand wheel 67 moves from a position indicating "30" of the last day to the position indicating "31".
Then, as in the case of a long month, in response to the movement of the hammer 70 from the final position to the initial position, the date hand wheel 67 instantly rotates counterclockwise
CH 714 690 A2 shows. Consequently, the date hand 7 linked to the date hand wheel 67 instantly moves from the position indicating "31" on the last day to the position indicating "1" on the first day.
In addition, in the case of the 29 ^th day of February in a leap year, the date hand wheel 67 rotates in a manner corresponding to the rotation of two steps of the date indicator 50 and of the date cam 61 by the month-end finger 53, so that the hammer 70 reaches the final position. At the same time, the date hand wheel 67 rotates two steps clockwise.
In addition, the date hand 7 linked to the date hand wheel 67 moves from the position indicating "29" of the last day of February in a leap year to the position indicating "31" .
Then, as in the case of a long month, the date hand wheel 67 instantly rotates anti-clockwise in a manner corresponding to the movement of the hammer 70 from the final position to the initial position. Consequently, the date hand 7 linked to the date hand wheel 67 instantly moves from the position indicating "31" on the last day to the position indicating "1" on the first day.
In addition, in the case of the 28 ^th day of February in a normal year, in the calendar hand wheel 67, in response to the rotation of three steps of the date indicator 50 and the date cam 61 caused by the month-end finger 53, the hammer 70 reaches the final position. At the same time, the date hand wheel 67 rotates three steps clockwise. In addition, the date hand 7 linked to the date hand wheel 67 moves from the position indicating "28" of the last day of February in a normal year to the position indicating "31".
Then, as in the case of a long month, in response to the movement of the hammer 70 from the final position to the initial position, the calendar needle wheel 67 instantly rotates counterclockwise by one shows. Consequently, the date hand 7 linked to the date hand wheel 67 instantly moves from the position indicating "31" on the last day to the position indicating "1" on the first day.
As described above, according to the calendar mechanism 10 of the embodiment, the last day of a long month, the date indicator 50 is pushed by the date finger 42 and it is rotated by one step , thus causing the date hand 7 to be operated by an amount corresponding to one day. In addition, according to calendar mechanism 10, the last day of a short month other than February, if the month-end finger 53 is pushed by the date advancement finger for short month 35 and the date indicator 50 turns one step, this date indicator 50 is pushed by the date finger 42 so as to turn one more step, thus causing the date hand 7 to be operated by an amount corresponding to two days. In addition, according to calendar mechanism 10, the last day of February in a leap year, if the month-end finger 53 is pushed by the date advancement finger for short month 35 and the indicator of date 50 is turned two steps, this date indicator 50 is pushed by the date finger 42 so as to turn one more step, thus causing the date hand 7 to be operated by an amount corresponding to three days . In addition, according to the calendar mechanism 10, the last day of February in a normal year, if the month-end finger 53 is pushed by the short month calendar advancement finger 35 and the indicator of date 50 is rotated by three steps, this date indicator 50 is pushed by the date finger 42 so as to turn one more step, thus causing the date hand 7 to be operated by an amount corresponding to four days .
In addition, when the date is changed from the last day of the month to the first day of the following month, the hammer 70 moves from the final position to the initial position, thus causing the month advancement finger 75 to push on. the month indicator teeth 81 of the month indicator 80. Then if the month indicator teeth 81 are pushed by the month advancing finger 75 and rotates counterclockwise d at a predefined angle, the distal end 87 of the month jumper 86 and the month indicator toothing 81 temporarily disengage from each other and are engaged with each other again. Consequently, the month indicator 80 and the month cam 27 rotate in an angular value of 30 °. Consequently, it is possible to rotate the month display disc 5 secured to the month indicator 80, and to unlock the month. Furthermore, in this case, the positions of the projecting portions 27a to 27e of the month cam 27 and the year cam 28 are also changed. Consequently, the date advancement finger for short month 35 can be moved depending on whether it is a long month, a short month other than February, February month of a year. leap and February of a normal year.
The operation described above takes place repeatedly and thus allows the calendar mechanism 10 to carry out a date advancement of the date indicator 50 by one day and an operation of the date hand 7 d one day the last day of a long month, that the calendar mechanism 10 carries out a date advancement of the date indicator 50 by two days and a maneuver of the date hand 7 by two days on the last day d '' a short month other than February, that the calendar mechanism 10 performs a date advancement of the date indicator 50 of three days and a maneuver of the date hand of three days on the 29 ^th day of the month February of a leap year, that the calendar mechanism 10 carries out a date advancement of the date indicator 50 by four days and a maneuver of the date hand 7 by four days on the 28 ^th day of February d 'a normal year and that the calendar mechanism 10 displays the date. In addition, the calendar mechanism 10 of this embodiment realizes the month and displays the month by rotating the month display disc 5 on the last day of the month.
CH 714 690 A2 [0130] As described in detail above, according to the present embodiment, it is possible to constitute the calendar mechanism 10 using a simple constitution comprising the calendar drive wheel for short month 25, the calendar advance finger for short month 35, as well as the date indicator 50 having the month end finger 53, without the need to use a complicated planetary gear mechanism as disclosed in the related prior art. In addition, the date advancement finger for short month 35 pushes on the end of month finger 53 on the last day of a short month other than February among the short months, each of which has a lower number of days. or equal to thirty days, to rotate the date indicator 50 by a first angle, and pushes the month-end finger 53 on the last day of February in a leap year to rotate the date indicator 50 by a second angle larger than the first angle. Consequently, the number of days of calendar catch-up carried out at the end of February in a leap year may be greater than the number of days of calendar catch-up carried out at the end of a short month other than the month from February. In addition, the date advancement finger for short month 35 pushes the end of month finger 53 on the last day of February in a normal year to rotate the date indicator 50 by a third larger angle. than the second angle. Consequently, the number of days of calendar adjustment carried out at the end of February in a normal year may be greater than the number of days of calendar adjustment carried out at the end of February of a leap year . Consequently, it is possible to automatically carry out the date adjustment at the end of February which is carried out manually in the related prior art both in the case of a normal year and in the case of a leap year . In addition, the calendar advance finger for short month 35 pushes the month-end finger 53 on the last day of a short month to rotate the date indicator 50, so that the moment at which the load applied on the gear train driving the date drive wheel for short month 25 provided with the date advancement finger for short month 35 is larger may exist only on the last day of short months. Consequently, it is possible to propose a calendar mechanism 10 which can have a simple constitution, which makes it possible to eliminate the application of a load on the gear train and which is able to automatically carry out the date catching up at the end of the February even in both a normal and a leap year.
In addition, the calendar mechanism 10 includes the sliding contact finger 34 which is in sliding contact with the external peripheral surface of the cam for months 27 and with the external peripheral surface of the cam for years 28, as well as the date advancement lever for short month 30 which revolves around the month cam 27. The external peripheral surface of the month cam 27 has several first projecting portions 27b to 27e corresponding to short months other than February, as well as a second projecting portion 27a corresponding to the month of February. The outer peripheral surface of the years cam has the third protruding portion 28a, which, when viewed in the axial direction of the first axis C1, extends the second protruding portion 27a in February from a normal year and which, when 'we look in the axial direction of the first axis C1, is retracted from the position extending the second protruding portion 27a in February of a leap year, by the rotation of the cam of the years 28.
According to the configuration, when the sliding contact finger 34 of the date advancement lever for the short month 30 comes into sliding contact with any protruding portion among the first protruding portions 27b to 27e, the second portion protruding 27a and the third protruding portion 28a, it is possible to move the date advancement lever for short month 30 relative to a state in which the sliding contact finger 34 is not in sliding contact with any of the portions projecting. Since the second projecting portion 27a is larger than the first projecting portions 27b to 27e around the first axis C1 in the circumferential direction, the time during which the sliding contact finger 34 is in sliding contact with the second projecting portion 27a and during which the short month advance lever 30 is thus placed otherwise is longer than the time during which the sliding contact finger 34 is in sliding contact with any of the first projecting portions 27b to 27e and during which the date advance lever for short month 30 is thus otherwise placed. Consequently, the duration during which the date advance lever for short month 30 causes the date advancement finger for short month 35 to be engaged with end-of-month finger 53 the last day of February is longer than the length of time that the lever calendar for short month 30 causes the calendar advancement finger for short month 35 to be engaged with the month-end finger 53 on the last day of a short month other than February.
In addition, when looking in the axial direction of the first axis C1, the third protruding portion 28a extends the second protruding portion 27a in February of a normal year and is set back from the position extending the second portion projecting 27a in February of a leap year. Consequently, the period during which the date advancement lever for short month 30 is otherwise placed in February of a normal year with respect to the state in which the sliding contact finger 34 is not in sliding contact with any protruding portions is longer than that in February of a leap year. Thus, a period during which the date advance lever for short month 30 allows the date advance finger for short month 35 to be engaged with the end of month finger 53 on the last day of February d '' a normal year is longer than the period during which the date advance lever for short month 30 allows the date advance finger for short month 35 to be engaged with the end of month finger 53 the last day of February in a leap year.
As described above, the date advancement finger for short month 35 can push the end of month finger 53 on the last day of February in a leap year to rotate the date indicator 50 of the second angle larger than the first angle and the number of days of the date adjustment made at the end of the month
CH 714 690 A2 of February in a leap year may be greater than the number of days of calendar adjustment made at the end of a short month other than February. In addition, the short month calendar advancement finger 35 can push the month end finger 53 to rotate the date indicator 50 by a third angle greater than the second angle on the last day of February. of a normal year and the number of days of calendar adjustment carried out at the end of February in a normal year may be greater than the number of days of calendar adjustment carried out at the end of February of a leap year. Consequently, it is possible to propose a calendar mechanism 10 which can automatically carry out the date catch up at the end of February even in both a normal and a leap year.
In addition, in the calendar mechanism 10, the Maltese cross mechanism 90 causes the cam of the 28s to rotate intermittently.
Consequently, it is possible to have a period during which the cam for the 28 years is stopped relative to the cam for the months 27. Therefore, it is easy to position the cam for the 28 years in a rotating position predefined at the end of February, compared to the case where the cam of the years turns continuously. Consequently, it is possible to reliably carry out the date catching up at the end of the short months by moving the date advancement lever for the short month 30 with a desired trajectory.
In addition, the short month calendar drive wheel 25 is provided with the degree adjustment rod 37 defining the range on which the short month advance lever 30 pivots 30. Therefore, for example , in a state where the date advance lever for short month 30 is on the side opposite to the date indicator 50 with respect to the first axis C1, or the like, the range on which the advance lever of the date for short month 30 is defined and it is possible to prevent the advance lever for date for short month 30 from accidentally touching another component. Therefore, the occurrence of problems in various mechanisms including the calendar mechanism 10 can be avoided.
In addition, the month-end finger 53 is formed so as to have the lateral surface 55a which comes into contact with the calendar advancement finger for short month 35 to repel this calendar advancement finger for month short 35 rotating in synchronism with the short month calendar wheel 25, in a direction away from the month end finger 53. Consequently, the short month calendar advancement finger 35 can be pushed back into a direction for moving away from the end of month finger 53. Consequently, it is possible to move the date advancement finger for short month 35 from the end of month finger 53 during long months without using a biasing element of the short month calendar advancement finger 35 in the direction away from the end of month month finger 53. Therefore, the short month calendar advancement finger 35 can prevent the qu indicator antième 50 is turned by a push on the end of month finger during long months. Therefore, it is possible to prevent a malfunction of the calendar mechanism 10.
In addition, the month indicator 80 rotates around the first axis C1 and the date indicator rotates around the second axis C2. Consequently, it is possible to freely dispose the date display means such as the month display disc 5 which is integral with the month indicator 80 and the date hand 7 which is integral with the indicator 50, compared to the arrangement in which the month indicator and the date indicator are coaxial with each other. Therefore, it is possible to propose the calendar mechanism 10 which can have a simple constitution and which is excellent as regards degree of freedom for the arrangement of the display of the month and the calendar.
According to the movement 100 and the timepiece 1 of the embodiment, there is provided therein the calendar mechanism 10 which can be constituted in a simple manner, which can avoid the application of a load on the train and who can automatically catch up with the date at the end of February even in both a normal and a leap year. Therefore, it is possible to provide the movement 100 and the timepiece 1 which are excellent in terms of reliability and convenience.
The present invention can adopt various examples of modification within its technical scope and is not limited to the embodiment which has been described above with reference to the drawings.
For example, in the embodiment described above, the month cam 27 rotates one revolution in one year in synchronism with the month indicator 80, but the present invention is not limited to this mode of achievement. For example, the month cam can be configured to rotate one revolution in a whole number of several years (two years or more) in synchronism with the month indicator. In this case, the outer peripheral surface of the month cam is provided with the first protruding portion and the second protruding portion by the number of years required for one revolution of the month cam and the year cam is arranged. by the number of years required for a month cam turn. Therefore, it is possible to obtain the same operating effects as with the calendar mechanism 10 described above.
In addition, in the embodiment described above, the cam from the 28s is configured to turn one turn in four years. However, it is not limited to that. The years cam can be configured to rotate one revolution in a number of years equal to a multiple of four.
In addition, in the embodiment described above, the third protruding portion 28a is arranged downstream of the second protruding portion 27a of the month cam 27 in the clockwise direction around the first axis
CH 714 690 A2
C1 when looking at the axial direction of the first axis C1. However, it is not limited to that. The third protruding portion can be arranged upstream of the second protruding portion of the month cam clockwise around the first axis C1 when looking in the axial direction of the first axis C1.
In addition, in the embodiment described above, the Maltese cross mechanism 90 includes the finger wheel 91 and the Maltese cross cam from the 95s. However, the constitution of the Maltese cross mechanism n is not particularly limited. For example, the Maltese cross mechanism may include a toothing linked to the cam of the years, a jumper which defines the rotational position of the toothing, a advancement finger which rotates the toothing by one step in connection with the revolution movement of the teeth.
In addition, in the embodiment described above, the cam from the 28s is configured to be rotated intermittently by the Maltese cross mechanism 90. However, the cam from the 28s can be configured to rotate continuously .
In addition, in the embodiment described above, the calendar mechanism 10 is configured in such a way that the month cam 27, the calendar month drive wheel 25 and the advancement finger of date for short month 35 rotate around the first axis C1 and the date indicator drive wheel 40 and the date finger 42 rotate around an axis different from the first axis C1. However, the present invention is not limited to this embodiment and the month cam, the short month calendar drive wheel, the date indicator drive wheel, the date advancement finger for short month and the date finger can rotate around the first axis C1 by means of providing that the month cam, the date drive wheel for short month and the date indicator drive wheel are coaxial. Therefore, the size of the calendar mechanism can be reduced.
In addition, in the embodiment described above, the date hand 7 is linked to the date hand wheel 67 and is intended to go back and forth, but the present invention does not is not limited to this embodiment. For example, the date hand can be attached to the date indicator and actuated to turn.
The embodiment uses the return wheel 78 which includes the spiral spring 79 as a biasing element to bias the hammer 70 towards the month indicator 80, but it is not limited to this. Consequently, for example, a helical spring can be used as an element to stress the hammer 70.
In addition, the embodiment uses the month display disc 5 as the month display means, but it is not limited to this. For example, as a means of displaying months, one can adopt an arrangement in which the characters indicating the months are present on the dial 2 and the indication is carried out by a month hand. In addition, in the embodiment described above, as date display means, the date hands 7 and 7B are adopted, but not limited to this. For example, as date display means, one can adopt an arrangement in which characters indicating the days are present on a day display disc and characters designating a day are visible by a date window.
In addition, the components of the embodiment described above can be replaced in an appropriate manner by known components within the scope which do not depart from the concept of the present invention.

权利要求:
Claims (7)
[1]
claims
1. Calendar mechanism comprising:
a short month calendar drive wheel which rotates one revolution in one day around a predefined axis; a date indicator which has an end-of-month finger and which rotates one turn in a month; and a short month calendar advancement finger which equips the short month calendar drive wheel, which rotates in synchronism with the short month calendar drive wheel while being moved, which pushes the end finger of months so as to rotate the date indicator by a first angle on the last day of a short month other than February from among the short months in each of which the number of days is less than or equal to 30 days, which pushes the end of month finger so as to rotate the date indicator by a second angle larger than the first angle on the last day of February in a leap year and which pushes the end of month finger so as to rotate the date indicator by a third angle larger than the second angle on the last day of February in a normal year.
[2]
2. Calendar mechanism according to claim 1, further comprising:
a month cam which is coaxial with the date wheel for the short month and which rotates one turn in a year;
a year cam which is carried by the month cam so as to be rotatable;
a drive mechanism that rotates the cam for years relative to the cam for months; and a short month calendar advancement lever which includes a sliding contact portion coming into sliding contact with an outer peripheral surface of the month cam and an outer peripheral surface of the year cam, which is provided so as to be rotatable with respect to the date wheel for short months and which rotates around the month cam in synchronism with the date wheel for short months, where the external peripheral surface of the month cam comprises:
CH 714 690 A2 several first protruding portions which each correspond to one month among the short months other than February, and a second protruding portion which corresponds to February and which is larger than the first protruding portions according to a circumferential direction around the predefined axis, where the external peripheral surface of the years cam includes a third protruding portion, where, when viewed in the axial direction of the predefined axis, the third protruding portion extends the second protruding portion in February of a normal year and is moved out of the position extending the second protruding portion in February of a leap year, by the rotation of the cam for years by the drive mechanism, where the date advancement finger for short month equips the date advancement lever for short month, and where the quant advancement lever ith for short month causes the date advancement finger for short month to be engaged with the end of month finger, being in sliding contact with the first protruding portions on the last day of a month among the short months other that the month of February, brings the date advancement finger for the short month to be engaged with the end of month finger, by being in sliding contact with the second protruding portion on the last day of February of a leap year and causes the date advancement finger for the short month to be engaged with the end of month finger, being in sliding contact with the second protruding portion and the third protruding portion on the last day of February of a normal year.
[3]
3. Calendar mechanism according to claim 2, wherein the drive mechanism rotates the cam of the years intermittently.
[4]
4. Calendar mechanism according to claim 1, in which the short month calendar drive wheel comprises a degree adjustment rod which regulates the pivoting range of the short month advance lever. .
[5]
5. Calendar mechanism according to one of claims 1 to 4, wherein the month-end finger comprises a pushing portion which comes into contact with the calendar advancement finger for short month to push, in a direction d distance from the end of month finger, the date advancement finger for short month rotating in synchronism with the date drive wheel for short month.
[6]
6. Movement including:
a calendar mechanism according to one of claims 1 to 5.
[7]
7. Timepiece including:
a movement according to claim 6.

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同族专利:

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公开号 | 公开日

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CN110209037B|2021-09-24|

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JP2019148549A|2019-09-05|

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CN110209037A|2019-09-06|

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法律状态:

优先权:

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申请号 | 申请日 | 专利标题

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JP2018034517A|JP2019148549A|2018-02-28|2018-02-28|Calendar mechanisms, movement and watch|

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