• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a timepiece mechanism (100) comprising a structure (20) in which a shaft (30) of a mobile (40) is pivoted along an axis of rotation (D) and comprising a braking device ( 10) for the constant torque mechanical braking of this shaft (30), this braking device (10) comprises a removable braking component relative to the structure (20) and which comprises, for its attachment to the structure, a serge mass, which carries a plurality of elastic elements, regularly distributed about a common axis about which these elastic elements (3) each comprise a contact zone, these contact zones together defining an opening arranged to cooperate by driving and elastic clamping with the shaft (30), so as to make this common axis coincide with the axis of rotation (D) of the shaft (30), and to apply to the shaft (30) a substantially constant tangential braking force .
    公开号:CH713718A2
    申请号:CH00542/17
    申请日:2017-04-24
    公开日:2018-10-31
    发明作者:Villar Ivan
    申请人:Eta Sa Mft Horlogere Suisse；
    IPC主号:
    专利说明:

    Description
    Field of the Invention [0001] The invention relates to a clockwork mechanism comprising at least one structure in which at least one shaft of a mobile is pivoted along an axis of rotation, said mechanism comprising at least one braking device for the constant torque mechanical braking of a said shaft.
    The invention further relates to a watch movement comprising at least one such clock mechanism.
    The invention also relates to a watch comprising at least one such movement and / or at least one such clock mechanism.
    The invention relates to the field of watch mechanisms, in particular display mechanisms.
    BACKGROUND OF THE INVENTION [0005] In an untensioned gear train, the angular clearance of the display mobiles results in an unpleasant visual effect for the user, called a ruffle, as conventionally visible on a needle of a display. small second wheel without tension.
    Some systems already exist such as magnetic brakes, flexible teeth or springs acting as a brake. These are often springs chips (foils) or blades rubbing on the mobile, which have the disadvantage of inducing a large variation of friction force and thus a variable disturbance of walking. SUMMARY OF THE INVENTION [0007] The invention proposes to simply and economically reduce the angular clearance at the level of the display mobiles in an untensioned gear train.
    For this purpose, the invention relates to a watch mechanism according to claim 1.
    The invention also relates to a watch movement comprising at least one such clock mechanism.
    The invention also relates to a watch comprising at least one such movement and / or at least one such clock mechanism.
    BRIEF DESCRIPTION OF THE DRAWINGS [0011] Other characteristics and advantages of the invention will appear on reading the detailed description which follows, with reference to the appended drawings, in which: FIG. 1 represents, schematically, partially, and in section, a part of a clockwork movement comprising a mechanism according to the invention, with a mobile whose shaft is pivoted, on a first side, in a conventional manner, relative to the structure of the movement, and, from a second opposite side, in a braking device arranged for the constant torque mechanical braking of this mobile, in a first variant; fig. 2 represents, schematically, and in plan view, the braking device according to this first variant, comprising a substantially circular massive serge, carrying elastic elements arranged to carry and brake the shaft of the mobile; fig. 3 represents, schematically, partially, and in perspective, such a mechanism with a braking device according to the first variant; fig. 4 represents, in a similar manner to FIG. 1, another mechanism according to the invention, according to a second variant of the braking device which comprises a fork on one side of its serge, and where this fork cooperates with clearance with a limitation lock, which is fixed on the structure of the movement ; fig. 5 shows, similarly to FIG. 2, the braking device according to this first variant; fig. 6 shows, similarly to FIG. 3, this mechanism according to the second variant; fig. 7 shows schematically and in plan view, this mechanism according to the second variant; fig. 8 represents, schematically, partially, and exploded perspective, this mechanism according to the second variant; fig. 9 represents, schematically, and in perspective, the same mechanism during the cooperation of a narrow portion of the limitation lock through the opening of the fork; fig. 10 represents, in the same way, the same mechanism during the cooperation of a large portion of the limitation lock in axial limitation of the fork; fig. 11 represents, in the same way, the same mechanism in its service position after the cooperation of a wide portion of the limitation lock in axial limitation of the fork; fig. 12 represents, in the same way, the same mechanism in another implantation, with respect to the structure of the movement, of the same lock, with respect to the same braking device; fig. 13 is a block diagram showing a watch having a movement with such a mechanism.
    DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0012] The invention relates to a clockwork mechanism 100 comprising at least one structure 20 in which at least one shaft 30 of a mobile 40 is pivoted along an axis of rotation D.
    This mechanism 100 comprises at least one braking device 10 for mechanical braking at constant torque of a shaft 30.
    According to the invention, this braking device 10 comprises a braking component 1, which is removable relative to the structure 20, and which comprises, for its attachment to the structure, a massive serge 2, which carries a plurality of elastic elements 3.
    These elastic elements 3 are preferably identical and regularly distributed around a common axis AC around which these elastic elements 3 each comprise a contact zone 4. The contact zones 4 together define an opening 5, which is arranged to cooperate by driving and elastic clamping with a shaft 30, so as to make the common axis AC coincide with the axis of rotation D of the shaft 30, and to apply to the shaft 30 a substantially constant tangential braking force.
    The value of the clamping on the shaft depends of course on the application. For current horological applications this clamping can be achieved between a low clamping, of the order of 5 micrometers to the radius, and a strong clamping, of the order of 10 micrometers to the radius.
    It is understood that these elastic elements 3 can also each be a combination of elastic elements, not necessarily identical, nor necessarily regularly distributed around the common axis AC, but it is necessary that the resultant forces of their support on a shaft 30 is zero, and that the distribution of torque that they exert on this shaft 30 is regular.
    We can of course consider hunting in the structure 20 a braking component 1 as shown in FIG. 2. However, such a configuration requires the total absence of burrs, and high machining precision which results in manufacturing costs.
    Also it is advantageous, in a particular implementation, to produce a self-centering braking component 1, free according to two degrees of freedom in a plane, but maintained on the third dimension, in height, by a lock.
    Thus, more particularly, the braking device 10 further comprises a positioning lock 6. This lock 6 is arranged to be fixed on an implantation 26 that includes the structure 20, by trapping the braking component 1 so as to allow it an axial play limited to a bounded axial value, in the direction of the common axis AC, and / or to allow it an angular clearance limited to a bounded angular value, in a plane perpendicular to the common axis AC. Thus, in this advantageous variant, the braking component 1 is no longer lodged in the structure 20, but positioned by this latch 6, which does not block the braking component 1. The latch 6 leaves a radial and axial degree of freedom brake component 1, so that it self-center and thus compensates for geometric variations.
    In a particular variant illustrated by the figures, the braking component 1 comprises, in a plane perpendicular to the common axis AC, a fork 7. This fork 7 is arranged to surround a bearing 9 of the lock 6 with a set corresponding to the bounded angular value. An upper face 71 of this fork 7 is arranged to cooperate in abutment abutment with at least one lower face 81, which comprises a collar 8 of the lock 6, to limit the axial stroke of the brake component 1.
    More particularly, this flange 8 comprises, in a first direction, a narrow portion of width LE less than the opening of the fork 7, to allow the insertion of the brake component 1 on the shaft 30 near the lock 7 fixed in a first angular insertion position, on the structure 20. The collar 8 comprises, in a second direction, preferably but not limitatively orthogonal to the first direction, a wide portion, which is of width LL greater than opening LO of the fork 7. This wide part carries the at least one lower face 81 which axially immobilizes the fork 7 in a second angular position of locking the lock 6.
    The latch 6 can be simply driven into the implantation 26 of the structure 20, in other variants it can be mounted screwed, or with a bayonet connection, or other. The axial clearance, such as the radial clearance, is preferably, and not exclusively, between 10 and 30 microns, more particularly between 15 and 25 microns.
    权利要求:
    Claims (11)
    [1]
    In a particular variant, the serge 2 of the braking component 1 comprises, in a plane perpendicular to the common axis AC, hollow recesses 12, diametrically opposite two by two with respect to the common axis AC, and which are provided for the handling of the brake component 1 by robotic manipulator clamp, or for easy gripping by the tweezers of an operator. The braking component 1 can be simply placed on a bearing surface of the structure 20, on which it is preferably held by the latch 6. In a particular variant, the serge 2 of the braking component 1 comprises, in a plane perpendicular to the common axis AC, radial stops 11 which are arranged to cooperate in radial abutment abutment with a recess 21 that includes the structure 20, to limit the radial stroke of the common axis AC relative to the axis of rotation D of the shaft 30. More particularly, these radial stops 11 are alternated with all or part of the clearances 12, when the brake component 1 comprises. In a particular application of this clockwork mechanism 100, a mobile 40 is a small second display mobile, whose shaft is generally rolled and slightly conical. The solution offered by the invention is well suited to this case, because of the moderate cost, the small size, the accuracy and the surface condition of the components in the presence, and the easy assembly because of the cone of the mobile tree. In another variant, the structure 20 comprises a plurality of implantations, which are arranged for the pivoting of different shafts 30 of mobile 40 different around a single implantation 26, which is arranged to receive a lock 6 fit to cooperate with a braking component 1 arranged on any one of the shafts 30. Thus, for example, the system can handle different distances of small seconds, while using the same components. In another variant, the serge 2 of the braking component 1 comprises a peripheral bearing which is arranged for, in a plane perpendicular to the common axis AC, cooperate with clamping with a recess 21 that includes the structure 20. In a particular embodiment, the braking component 1 is monobloc and micro-machinable material, such as silicon, DLC, or other. Manufacture by a lithographic process or similar ensures high geometric accuracy, and a good surface and is mostly repetitive. The invention also relates to a watch movement 200 comprising at least one such watch mechanism 100. [0031] A particular application of the invention relates to its application to a chronograph mechanism. The invention also relates to a watch 300 comprising at least one such movement 200 and / or at least one such clock mechanism 100. In short, the use of a braking component, as described. above, similar to a washer with flexible arms rubbing on the pivot of a mobile, including a small seconds wheel, is particularly advantageous, because of the reproducibility of the behavior of the mobile, due to the manufacturing process of the brake component. In the example of the pivot of the small second wheel, the invention also benefits from the good geometric accuracy and good surface condition induced by rolling. The friction force variation, unacceptable in the prior art, is reduced or even eliminated, which induces a lower variation of the gait. claims
    1. Clock mechanism (100) comprising at least one structure (20) in which at least one shaft (30) of a mobile (40) is pivoted along an axis of rotation (D), said mechanism (100) comprising at least one braking device (10) for the constant torque mechanical braking of a said shaft (30), characterized in that said braking device (10) comprises a brake component (1) removable from said structure (20) and which comprises, for its attachment to said structure, a serge (2) massive, which carries a plurality of identical elastic elements (3) and regularly distributed around a common axis (AC) around which said elements elastic members (3) each comprise a contact zone (4), said contact zones (4) together defining an opening (5) arranged to cooperate by driving and elastic clamping with a said shaft (30), so as to coincide said common axis (AC) with said axis of rotation (D) dud it shaft (30), and to apply to said shaft (30) a substantially constant tangential braking force.
    [2]
    2. timepiece mechanism (100) according to claim 1, characterized in that said braking device (10) further comprises a latch (6) for positioning, arranged to be fixed on an implantation (26) that includes said structure ( 20) by trapping said braking component (1) so as to allow it an axial clearance limited to a bounded axial value, in the direction of said common axis (AC), and / or to allow it an angular clearance limited to an angular value bounded in a plane perpendicular to said common axis (AC).
    [3]
    3. timepiece mechanism (100) according to claim 2, characterized in that said braking component (1) comprises, in a plane perpendicular to said common axis (AC), a fork (7) arranged to surround a range (9). ) of said latch (6) with a clearance corresponding to said bounded angular value, and an upper face (71) of said fork (7) is arranged to cooperate abutting abutment with at least one lower face (81) that comprises a flange (8) of said latch (6) for limiting the axial stroke of said brake component (1).
    [4]
    4. timepiece mechanism (100) according to claim 3, characterized in that said flange (8) comprises, in a first direction, a narrow portion of width less than the opening of said fork (7), to allow l insertion of said braking component (1) on said shaft (30) in the vicinity of said latch (7) fixed in a first insertion angular position, on said structure (20), and comprises, in a second direction orthogonal to said first direction, a wider portion of width greater than the opening of said fork (7), and carrying said at least one lower face (81) which axially immobilizes said fork (7) in a second angular position of locking said latch (6) .
    [5]
    5. timepiece mechanism (100) according to one of claims 2 to 4, characterized in that said serge (2) of said brake component (1) comprises, in a plane perpendicular to said common axis (AC), stops radial bearings (11) arranged to cooperate in radial abutment abutment with a recess (21) that comprises said structure (20), to limit the radial stroke of said common axis (AC) relative to said axis of rotation (D) of said shaft (30); ).
    [6]
    6. timepiece mechanism (100) according to one of claims 2 to 5, characterized in that said structure (20) comprises a plurality of implantations arranged for the pivoting of said so-called shafts (30) of said mobiles (40). ) different, around the same said implantation (26) arranged to receive a said latch (6) adapted to cooperate with a said brake component (1) arranged on any one of said shafts (30).
    [7]
    7. timepiece mechanism (100) according to claim 1, characterized in that said serge (2) of said brake component (1) comprises a peripheral surface arranged for, in a plane perpendicular to said common axis (AC), cooperate with clamping with a recess (21) that comprises said structure (20).
    [8]
    8. timepiece mechanism (100) according to one of claims 1 to 7, characterized in that said brake component (1) is monobloc and micro-machinable material.
    [9]
    9. timepiece mechanism (100) according to one of claims 1 to 8, characterized in that said mobile (40) is a small second display mobile.
    [10]
    Timepiece movement (200) comprising at least one watch mechanism (100) according to one of claims 1 to 9.
    [11]
    11. Watch (300) comprising at least one watch mechanism (100) according to one of claims 1 to 9.
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    同族专利:
    公开号 | 公开日
    CH713718B1|2021-05-14|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    CH00542/17A|CH713718B1|2017-04-24|2017-04-24|Mechanical braking device for mobile watchmaker.|CH00542/17A| CH713718B1|2017-04-24|2017-04-24|Mechanical braking device for mobile watchmaker.|
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