• 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 present invention relates to a movement allowing a reduction in size, as well as a timepiece. More specifically, it relates to a movement (10) comprising: a ratchet wheel (30) which is rotatable about a first axis (O) and which is arranged to be able to raise a main barrel spring; and a pawl (40) arranged to be rotatable about a second axis (P), and which includes a detent portion (42) engaged with the ratchet wheel (30). A contact portion (60) of the detent portion (42) and the ratchet wheel (30) is located downstream of the center line (C) of the pawl (40) and the ratchet wheel (30). relative to a first direction of rotation (D1) of the ratchet wheel (30) when the main spring is raised. A distal end surface (46) of the detent portion (42) is directed downstream in the first direction of rotation (D1) at the contact portion (60).
    公开号:CH714613A2
    申请号:CH00077/19
    申请日:2019-01-24
    公开日:2019-07-31
    发明作者:Arakawa Yasuhiro
    申请人:Seiko Instr Inc；
    IPC主号:
    专利说明:

    Description
    TECHNOLOGICAL BACKGROUND OF THE INVENTION
    1. Technical Field of the Invention The present invention relates to a movement and a timepiece.
    2. Description of the Prior Art [0002] Conventionally, the movement of a mechanical timepiece is equipped with a barrel housing a main power supply spring, a ratchet wheel winding up the main spring, and a winding cog turning the röchet wheel. In order to prevent the main spring, which has been reassembled, from slackening, the röchet wheel is engaged with a ratchet regulating its reverse rotation. For example, patent document 1 (JP-UM-A-52-162 172) discloses a regulating lever which is formed by a plate and an end which is used as a ratchet.
    According to the technique disclosed in patent document 1, however, the regulating lever is arranged so as to be offset relative to the röchet wheel in the radial direction, so that it is necessary to '' arrange a space to place the regulation lever in a position in which it covers the röchet wheel. Thus, the size of the movement is increased in the thickness direction of the röchet wheel. Furthermore, according to the technique disclosed in patent document 1, it is necessary to provide a structure making it possible to maintain the position of the pawl, so that it is also feared that the size of the movement is also increased in the plane. Thus, the conventional technique poses a major problem for a movement and a timepiece equipped with such a movement, which must be sought to reduce.
    SUMMARY OF THE INVENTION According to one aspect of the present application, it is sought to provide a movement and a timepiece allowing a reduction in size.
    According to the present application, there is provided a movement comprising: a röchet wheel which is mounted movable in rotation about a first axis and which is arranged so as to be able to reassemble a main barrel spring; and a pawl arranged to be movable in rotation about a second axis, and which has a latching part in engagement with the röchet wheel, and in which a contact portion of the latching part and the röchet wheel is located downstream of a line connecting the center of the pawl to the center of the röchet wheel with respect to a first direction of rotation of the röchet wheel when the main spring is wound up; and in which a surface of the latching part is directed downstream in the first direction of rotation at the level of the contact portion.
    According to the present application, when a torque is exerted on the röchet wheel in a direction opposite to the first direction of rotation due to the relaxation of the main spring, the röchet wheel is brought into contact with the part of latching of the pawl from the downstream side in the first direction of rotation, at a position located downstream of the center line of the pawl and the ratchet wheel in the first direction of rotation. Thus, the latching portion of the pawl extends to meet the röchet wheel so as to regulate the rotation in the first direction of rotation of the röchet wheel. In this way, it is possible to regulate the rotation of the röchet wheel by maintaining the positioning of the locking part without using any other element. Thus, even if the size of the latching part is reduced, it is possible to cause the pawl to function as an element for regulating the rotation of the röchet wheel in the opposite direction to that corresponding to the first direction of rotation. . Thus, compared to the conventional case where part of the regulating lever is used as a ratchet, it is possible to provide a movement of reduced size.
    In the above movement, it is desirable that a perpendicular to the contact portion intersects the second axis, in a view corresponding to its own axial direction.
    According to the present application, among the components of the röchet wheel force exerted on the latching part at the contact portion, the force component in a normal direction, that is to say perpendicular to the contact portion, is exerted in the direction of the second axis, so that the latching part of the pawl rotates around the second axis in order to eliminate any deviation from the röchet wheel. Thus, the röchet wheel can extend reliably against the latching part of the pawl, thus allowing reliable regulation of the rotation of the röchet wheel in the opposite direction to that corresponding to the first direction of rotation.
    In the above movement, it is desirable that the latching part has an arcuate contact surface, comprising the contact portion, the center of which is located at the level of the second axis when the latter is seen in the direction of its own axis.
    According to the present application, whatever the portion of the contact surface with which the latching part of the röchet wheel is brought into contact, the normal component of the force of the röchet wheel acting on the part latching is exerted towards the second axis. Thus, a deviation of the position of the contact portion involving a position deviation such as that of the relative position of the pawl relative to the röchet wheel is permitted.
    CH 714 613 A2 In the above movement, it is desirable to provide moreover a compression means in mutual engagement with the pawl, and acting on the latching part to encourage it to move towards the wheel at röchet; and that this compression means is arranged so as to cover at least partially the pawl in the axial direction of the second axis.
    According to the present application, compared to the case where the compression means taken as a whole is disposed side by side with respect to the pawl in the front-rear direction, it is possible to reduce the space where the pawl and the compression means are arranged. Thus, it is possible to further reduce the size of the movement.
    In the above movement, it is desirable that the compression means is formed by a cantilever, one distal end of which is in mutual engagement with the pawl, and of which an intermediate part is arranged at a more distant position. of the second axis than those of the proximal end and the distal end thereof.
    According to the present application, it is possible to preserve the length of the cantilever by eliminating any increase in the maximum diameter of the compression means by using the second axis as a reference. Thus, it is possible to ensure compatibility between the reduction in the size of the compression means and the level of flexibility in the design having regard to the compression force exerted by the compression means.
    According to the present application, there is also provided a timepiece equipped with the above movement.
    According to the present application, a movement is provided the size of which can be reduced, so that it is also possible to reduce the size of the timepiece.
    Thus, according to the present application, it is possible to provide both a movement and a timepiece of reduced sizes.
    BRIEF DESCRIPTION OF THE DRAWINGS
    Fig. 1 is an external view of a timepiece according to a preferred embodiment.
    Fig. 2 is a plan view, from the front face, of a movement according to a preferred embodiment.
    Fig. 3 is a sectional view, taken along the axis III-III of FIG. 2.
    Fig. 4 is a plan view, from the front face, of the essence of a movement according to a preferred embodiment.
    Fig. 5 is a sectional view taken along the axis V-V of FIG. 2.
    Fig. 6 is a diagram illustrating the operation of a movement according to a preferred embodiment.
    Fig. 7 is a diagram illustrating the operation of a movement according to one embodiment.
    DESCRIPTION OF PREFERENTIAL EMBODIMENTS In the following, a preferred embodiment for the present invention will be described with reference to the drawings. In the following description, the components having the same or equivalent functions will be indicated by the same reference numbers. No description will be repeated or repeated for such components.
    In general, we refer to the "movement" to speak of the mechanical body comprising the drive part of the timepiece. A dial and hands are fitted to this movement, and all of it is inserted into a case of the timepiece. The resulting product is referred to as the "integral" of the timepiece. Among the two sides of a plate constituting the base plate of the timepiece, reference is made to the side where the crystal of the timepiece is arranged (that is to say the side where the dial) as the "back side" of the movement. Among the two sides of the plate, we refer to the side where the bottom of the timepiece case is placed (in other words the side opposite the dial) as the "front face" of the movement. Each wheel and / or mobile described in the following has its axis of rotation oriented in the front-rear direction of movement.
    [0021] FIG. 1 is an external view of the timepiece according to a preferred embodiment.
    As illustrated in FIG. 1, the entire timepiece 1 of this present embodiment comprises, within a timepiece case 3 consisting of a base (not shown) and a crystal 2 (also called glass), a movement 10, a dial 4 having a scale or the like indicating at least one information related to time, an hour hand 5 indicating the current time, a minute hand 6 indicating the current minute, and a second hand 7 indicating the seconds that pass. Timepiece 1 is a wristwatch of the automatic winding type. When an oscillating mass (not shown) is actuated in rotation following movements of the user, a main barrel spring 23 (illustrated in fig. 3), which constitutes the energy source for the timepiece 1, is reassembled via an automatic winding gear train. In timepiece 1, the main spring
    CH 714 613 A2 can also be reassembled manually. By rotating a crown 8, the main spring 23 is wound up via a manual winding gear train.
    [0023] FIG. 2 is a plan view of the movement of this same embodiment, seen from the front face. Fig. 3 is a sectional view taken along the axis III-III of FIG. 2.
    As illustrated in FIGS. 2 and 3, the movement 10 is provided with a plate 11, a barrel bridge 12 arranged on the side of the front face of the plate 11, a movement barrel 20 housing a main spring 23, a röchet wheel 30 arranged so as to be able to reassemble the main spring 23, a ratchet 40 having a latching part 42 in engagement with the röchet wheel 30, and a ratchet spring 50 (as a means of compression) in mutual engagement with the pawl 40. The movement 10 is equipped with a front gear train comprising a movement barrel 20, a mobile - that is to say a wheel and a pinion - of center (not shown), a third mobile (always formed by a wheel and a pinion), a second mobile - that is to say a wheel and a second pinion - etc., and an exhaust / regulator mechanism comprising a balance-spring, an exhaust mobile formed by an exhaust wheel and pinion, an anchor, etc. . A description of these usual elements will however not be provided in detail.
    As illustrated in FIG. 3, the movement barrel 20 has a barrel shaft 21, a barrel drum 22 mounted on a barrel shaft 21, and a main barrel spring 23 housed in the barrel drum 22. The barrel shaft 21 is supported on one side by the plate 11 and on the other by the barrel bridge 12 so as to be movable around the first axis of rotation O. The barrel drum 22 is movably mounted on the barrel shaft 21. The internal end of the main spring 23 is connected to the barrel shaft 21. The external end of the main spring 23 is connected to the internal peripheral surface of the barrel drum 22. The main spring 23 is wound, or respectively reassembled under the action of the rotation of the barrel shaft 21. The barrel drum 22 is rotated under the action of the return force of the main spring 23 when the latter relaxes, which generates a driving force of the train before .
    The röchet wheel 30 is arranged coaxially with respect to the barrel movement 20. The röchet wheel 30 is fixed to the portion of the barrel shaft 21 between the barrel drum 22 and the barrel bridge 12. The wheel röchet 30 rotates synchronously with the barrel shaft 21 according to a first direction of rotation D1 (see fig. 4) around a first axis of rotation O, thus raising the main spring 23 housed in the barrel drum 22. A torque is exerted in a second direction of rotation D2, opposite to the first direction of rotation D1, on the röchet wheel 30 due to the restoring force when the main spring 23 relaxes. Teeth 31 are formed on the outer periphery of the röchet wheel 30. A toothed wheel (for example, a crown wheel) which is part of the automatic winding cog or the manual winding cog is engaged with the röchet wheel 30.
    The pawl 40 is arranged so that it covers the röchet wheel 30, when the latter is seen in the front-rear direction. The pawl 40 is carried by the barrel bridge 12 so as to be movable in rotation around a second axis P. More specifically, the pawl 40 is mounted and fixed on a cylindrical support tube 13 which stands forward from the barrel bridge bridge 12. The front end of the support tube 13 has a shape of smaller diameter than the part of the support tube 13 on which the pawl 40 is adjusted. A ring 14 is inserted on the front end of the support tube 13. The ring 14 is held between a shoulder of the support tube 13 and a support surface of a screw 15 which is inserted by screwing into the support tube 13 from the front panel. At the rear end of the ring 14 is a sidewall 14a projecting outward in the radial direction. The external diameter of the flank 14a is larger than the part of the support tube 13 on which the pawl 40 is fixed. The outside diameter of the part of the ring 14 on the front side of the sidewall 14a is smaller than the outside diameter of the screw head 15. The pawl 40 is supported by the support tube 13 between the barrel bridge 12 and the sidewall 14a of the ring 40 while including a vertical flap. The vertical flap is a clearance in the direction of the stop relative to the shaft.
    [0028] FIG. 4 is a plan view, seen from the front face, of the main part of the movement according to this same preferred embodiment.
    As illustrated in FIG. 4, the pawl 40 is equipped with an annular base part 41 fixed to the support tube 13 (see fig. 3), a latching part 42 extending from the base part 41 in a direction orthogonal to the second axis P, an operating part 43 and an actuating lever 44, and a pin 45 arranged on the actuating lever 44. The latching part 42 extends in the direction of the röchet wheel 30. The part d 'snap 42 is in contact with the röchet wheel 30 at the contact portion 60. The contact portion 60 of the latching part 42 and the röchet wheel 30 is located downstream of the center line C of the pawl 40 and of the röchet wheel 30 according to the first direction of rotation D1. According to a view in the front-rear direction, the center line C of the pawl 40 and the röchet wheel 30 is a segment connecting the center of the ratchet 40 (the second axis P) and the center of the röchet wheel 30 ( the first axis O).
    The snap-in portion 42 has a distal end surface 46 (contact surface) including the contact portion 60. The distal end surface 46 of the snap-in portion 42 extends in an arcuate fashion of the second axis P when the latter is seen in the front-rear direction. The distal end surface 46 of the locking part 42 is oriented on the downstream side according to the first direction of rotation D1. The surface of a tooth 32 of the röchet wheel 30 abuts on the distal end surface 46 of the locking part 42 from the downstream side with respect to the first direction of rotation D1. In the following description, among the peripheral directions around the second axis P, reference will be made
    CH 714 613 A2 in the direction that the distal end of the latching portion 42 moves toward the center line C as the "direction of engagement".
    The operating part 43 is a lever-shaped part which is actuated when the pawl 40 must be rotated manually. The operating part 43 is arranged at a position different from that of the pawl 42. According to the present embodiment, the operating part 43 is arranged on the side opposite to the latching part 42, the second axis P being interposed between the two. As illustrated in fig. 2, at the position where it covers the distal end of the operating part 43, seen in a front-rear direction, the barrel bridge 12 has an avoidance portion 12a formed so as to avoid the operating part 43. In the present embodiment described, the avoidance portion 12a is a through hole extending through the barrel bridge 12 in the front-rear direction. The avoidance portion 12a serves as a space to prevent a tool acting on the operating part 43 from being able to come into mutual contact with the barrel bridge 12 when the pawl 40 must be actuated manually.
    As illustrated in FIG. 4, the actuation lever 44 is arranged in a position different from that of the latching part 42 and the operating part 43. In the present embodiment, according to a view taken in the front-rear direction, the actuating lever 44 is disposed between the operating part 43 and the center line C, and on the side opposite to the latching part 42, with the center line C interposed between the two.
    [0033] FIG. 5 is a sectional view taken along the axis V-V of FIG. 2.
    As illustrated in FIG. 5, the actuation lever 44 has a pin insertion portion 44a, into which the pin 45 is inserted. The pin insertion portion 44a is a hole extending in the front-to-back direction. The pin 45 is inserted into the pin insertion portion 44a from the front, and is fixed to the actuation lever 44. The pin 45 has a column shape extending in the front-rear direction. At the front end of the pin 45 is formed a flange 45a projecting outward in the radial direction.
    The pawl spring 50 is disposed in front of the barrel bridge 12. The pawl spring 50 is a cantilever acting on the pawl 40 to push it in the direction of engagement. The proximal end 51 of the pawl spring 50 is configured in an annular shape and is fitted to the front end of the ring 14. The proximal end 51 of the pawl spring 50 is supported by the support tube 13 via the ring 14 while presenting a vertical flap between the flank 14a of the ring 14 and the support surface of the screw 15.
    As illustrated in FIG. 4, the pawl spring 50 is configured in a “U” shape, so that the intermediate part 52 is disposed in a position further from the second axis P than the proximal end 51 and the distal end 53. According to In this embodiment, the pawl spring 50 extends linearly from the proximal end 51 when viewed in the front-back direction. Then, it is bent 180 degrees at the level of the intermediate part 52, and extends linearly towards the distal end 53. A first part 54 between the proximal end 51 and the intermediate part 52 is located downstream, in the direction of engagement direction of a second part 55 between the intermediate part 52 and the distal end 53. Between the first part 54 and the second part 55 is disposed the pin 45 of the pawl 40. The second part 55 is in contact with the pin 45 from upstream in the direction of the engagement direction. The first part 54 is in contact with a stop pin 16 fixed to the barrel bridge 12 from the downstream side in the direction of the direction of engagement. In the area between the first part 54 and the second part 55 according to a view taken in the front-rear direction, the stop pin 16 is arranged so as to stand up from the front face of the barrel bridge 12. Consequently, the pawl spring 50 is regulated in rotation in the direction opposite to that of the direction of engagement with respect to barrel bridge 12. And the pawl spring 50 acts on pin 45 to move it in the direction of engagement with respect to the barrel bridge 12. Thus, the pawl spring 50 compresses the latching part 42 of the pawl 40 to move it towards the röchet wheel 30.
    In the following, the force exerted on the pawl 40 and the röchet wheel 30 will be described.
    Figs. 6 & 7 are diagrams illustrating the operation of the movement according to the preferred embodiment described so far. They consist of plan views, from the front face, of the movement according to this embodiment.
    As illustrated in FIG. 6, the contact portion 60 of the latching part 42 of the pawl 40 and the röchet wheel 30 is located downstream of the center line C in the first direction of rotation D1. At the contact portion 60 of the pawl 40 and the röchet wheel 30, the distal end surface 46 of the latching part 42 directed downstream in the first direction of rotation D1. The surface of a tooth 32 of the röchet wheel 30 is in contact with the distal end surface 46 of the locking part 42 from the downstream in the first direction of rotation D1. When the röchet wheel 30 receives the torque in the second direction of rotation D2 due to the restoring force when the main spring 23 relaxes, a force F of the röchet wheel 30 acts on the distal end surface 46 of the snap-in part 42. The force F of the röchet wheel 30 is exerted in the tangential direction of the circle along the first axis O from the contact portion 60 of the pawl 40 and of the röchet wheel 30.
    Here, the distal end surface 46 of the latching portion 42 extends in an arcuate shape around the second axis P seen in the front-rear direction, so that a perpendicular (or normal) N at the contact portion 60 of the distal end surface 46 of the latching portion 42 and the röchet wheel 30 is
    CH 714 613 A2 intersecting with the second axis P. Thus, among the components of the force F exerted by the röchet wheel 30 on the distal end surface 46 of the latching part 42, a component F1 of the force in the direction of the perpendicular N is exerted towards the second axis P. As a result, the latching part 42 of the pawl 40 does not rotate around the second axis P but extends against the röchet wheel 30, thus regulating the rotation of the röchet wheel 30 according to the second direction of rotation D2.
    The latching part 42 of the pawl 40 is compressed by the pawl spring 50 which pushes it to move towards the röchet wheel 30. Thus, the latching part 42 is in contact, from upstream in the direction of engagement direction, with the tooth 31 among the plurality of teeth 31 of the röchet wheel 30 located upstream of a tooth in the first direction of rotation D1 relative to the tooth 31 in contact with the surface distal end 46 of the latching part 42. Thus, the latching part 42 is regulated in rotation in the direction of engagement, and it is maintained in the state in which it extends against the röchet wheel 30.
    On the other hand, as illustrated in fig. 7, when the torque acts on the röchet wheel 30 in the first direction of rotation D1 when the main spring 23 is raised, the röchet wheel 30 rotates the latching part 42 of the pawl 40 in the direction opposite to that of the direction of engagement, against the compression force of the pawl spring 50. Consequently, the ratchet wheel 30 rotates in the first direction of rotation D1, letting the latching part 42 of the pawl 40 pass one of the teeth 31 of the röchet wheel 30.
    As described in detail above, in this embodiment, the contact portion 60 of the latching portion 42 of the pawl 40 and the röchet wheel 30 is located downstream of the center line C of the pawl 40 and the ratchet wheel 30 in the first direction of rotation D1, and the distal end surface 46 of the latching part 42 and of the pawl 40 is directed towards the downstream side in the first direction of rotation D1 .
    In a structure like this, when the torque in the opposite direction to the first direction of rotation D1 (the second direction of rotation D2) acts on the röchet wheel 30 due to the relaxation of the main spring 23, at level of a position downstream of the center line C in the first direction of rotation D1, the röchet wheel 30 is brought into contact with the latching part 42 of the pawl 40 from downstream in the first direction of rotation D1. Thus, the latching part 42 of the pawl 40 comes up against the röchet wheel 30 in order to regulate the rotation of the röchet wheel 30 according to the first direction of rotation D1. Consequently, it is possible to regulate the rotation of the röchet wheel 30 by maintaining the positioning of the locking part 42 without having to use any other element. Thus, even when the size of the latching part 42 is reduced, it is possible to encourage the pawl 40 to function as a member for regulating the rotation of the röchet wheel 30 in the direction opposite to the first direction of rotation. D1. Thus, compared to the conventional technique according to which a part of the regulation lever is used as a ratchet, it is possible to provide a movement 10 and a timepiece 1 allowing further reduction in size.
    According to a view taken in the front-rear direction, the perpendicular / normal N to the contact portion 60 of the latching part 42 of the pawl 40 and the röchet wheel 30 intersects the second axis P. In such a structure, among the components of the force F exerted by the röchet wheel 30 on the latching part 42 at the level of the contact portion 60, the force component F1 in the direction of the perpendicular / normal N is exerted towards the second axis P. Thus, it is possible to suppress the rotation of the latching part 42 of the pawl 40 around the second axis P so that it moves away from the röchet wheel 30. Thus, the wheel röchet 30 is reliably retained by the latching part 42 of the pawl 40 which rises against it, thus making possible reliable regulation of the rotation of the röchet wheel 30 in the opposite direction to the first direction of rotation D1 .
    Furthermore, in a view taken in the front-rear direction, the latching portion 42 of the pawl 40 has a distal end surface 46 having the contact portion 60 and which extends in an arcuate fashion around the second axis P. According to such a structure, whatever the portion of the distal end surface 46 of the latching part 42 with which the röchet wheel 30 is brought into contact, among the components of the force F exerted by the röchet wheel 30 on the latching part 42, the force component F1 in the direction of the perpendicular / normal N is exerted in the direction of the second axis P. Thus, it is possible to allow a deviation of the position of the contact portion 60, implying a deviation of the position or the like of the relative positions of the pawl 40 and of the röchet wheel 30. Furthermore, according to a view taken in the front-rear direction, the spring of c liquet 50 is arranged so that at least a part of the latter covers the pawl 40. In such a structure, it is possible to obtain an additional reduction in size in the space where the pawl 40 and the pawl spring 50 are arranged, compared to the case where the entire pawl spring is arranged side by side with respect to the pawl in a view taken in the front-rear direction. Thus, it is possible to obtain an even greater size reduction for movement 10.
    Furthermore, the pawl spring 50 is a cantilever in mutual engagement with the pawl 40 at its distal end 53, and the intermediate part 52 is arranged in a position further from the second axis P than the proximal end 51 and the distal end 53. In such a structure, it is possible to preserve the length of the cantilever by eliminating any increase in the maximum external diameter of the pawl spring 50 when the second axis P is used as a reference. Thus, it is possible to guarantee compatibility between a reduction in size of the pawl spring 50, and a level of flexibility in the choice of configuration for the compression force exerted by the pawl spring 50.
    CH 714 613 A2 Furthermore, the pawl 40 is equipped with the operating part 43 extending from the proximal end 41, and the barrel bridge 12 has the avoidance portion 12a formed so as to avoid the operating part 43 in the position where it covers the distal end of the operating part 43 in a view taken in the front-rear direction. In such a structure, when the pawl 40 must be rotated manually, it is possible to prevent a tool acting on the operating part 43 from being able to come into mutual contact with the barrel bridge 12, in such a way so that it is possible to provide improvements in handling of the movement 10 when maintenance or the like is performed.
    The present invention is not limited to the embodiment described above with reference to the drawings, but also includes different variants without departing from the technical scope thereof.
    For example, while according to the preferred embodiment described above the pawl spring 50 is a cantilever, such a configuration should not be interpreted in a limiting manner. For example, the pawl spring could also be formed by a helical torsion spring.
    Furthermore, while according to the preferred embodiment describes the perpendicular / normal N to the contact portion 60 of the distal end 46 of the latching part 42 and to the surface of a tooth 32 of the röchet wheel 30 intersects the second axis P, such a configuration should not be interpreted restrictively. The perpendicular to the contact portion of the distal end surface of the latching portion and to the surface of a tooth 32 of the röchet wheel 30 could be intersecting with the center line C between the first axis O and the second axis P. In this case, among the force components exerted by the röchet wheel 30 on the latching part, the force component in the perpendicular or normal direction would be deflected downstream in the direction of engagement relative to the direction towards the second axis P, so that the torque in the engagement direction acts on the latching part. The latching part, however, is in contact, from upstream in the direction of engagement, with the tooth 31 located upstream of a tooth, in the first direction of rotation D1, relative to the tooth 31 in contact with the distal end surface, so that it can extend to meet the ratchet wheel 30 without rotating in the direction of engagement.
    Furthermore, the perpendicular / normal to the contact portion of the distal end surface of the latching part and of the surface of a tooth 32 of the röchet wheel 30 may not be intersecting with the center line C. In such a case, among the components of the force exerted by the röchet wheel 30 on the latching part, the force component in the normal or perpendicular direction is deflected upstream in the direction d engagement with respect to the direction towards the second axis P, so that the torque in the direction opposite to that of the direction of engagement acts on the latching part. However, by suitably adjusting the friction force at the contact portion of the latching portion and the röchet wheel 30, it is possible to suppress any rotation of the latching portion in the opposite direction to that of the engagement direction and make sure that it stands up against the röchet wheel 30.
    Furthermore, while in the embodiment described above the distal end surface 46 of the latching part 42 extends in the form of an arc around the second axis P seen in the forward direction- rear, such a configuration should not be interpreted restrictively. For example, the distal end surface of the latching portion may extend linearly in a view taken in the front-back direction.
    Furthermore, while in the embodiment described above the pin 45 of the pawl 40 is arranged on actuation lever 44, there is no particular restriction on the part where the pin is arranged. Moreover, the pawl spring can be arranged so as to come to engage with a portion other than the pin, such as the actuation lever.
    Apart from the above, the components as described in the context of the preferred embodiment above can be replaced by other well-known components as required without departing from the technical framework or the spirit of the present invention.
    List of reference numbers and signs 1 ... timepiece, 10 ... movement, 23 ... main spring, 30 ... ratchet wheel, 40 ... ratchet, 42 ... snap-in part, 46 ... distal end surface (contact surface), 50 ... pawl spring (compression means), 51 ... proximal end 52 ... intermediate part, 60 ... portion contact, O ... first axis, P ... second axis, D1 ... first direction of rotation, C ... center line, N ... perpendicular / normal.
    权利要求:
    Claims (6)
    [1]
    claims
    1. Movement (10) comprising: a röchet wheel (30) which is rotatable around a first axis (O) and which is arranged so as to be able to reassemble a main spring (23) of the barrel ; and a pawl (40) arranged so as to be movable in rotation about a second axis (P), and which has a latching part (42) engaged with the röchet wheel (30),
    CH 714 613 A2 a contact portion (60) of the latching part (42) and the röchet wheel (30) being located downstream of a line connecting the center of the pawl (40) to the center of the wheel röchet (30) relative to a first direction of rotation (D1) of the röchet wheel (30) when the main spring (23) is raised; and a surface of the latching part (42) being directed downstream in the first direction of rotation (D1) at the level of the contact portion (60).
    [2]
    2. Movement according to claim 1, in which a perpendicular (N) to the contact portion (60) intersects the second axis (P), according to a view taken in the axial direction corresponding to the second axis (P).
    [3]
    3. Movement according to claim 2, wherein the latching part (42) has an arcuate contact surface, comprising the contact portion (60), and whose center is located at the second axis (P) along a view taken in the axial direction corresponding to the second axis (P).
    [4]
    4. Movement according to one of claims 1 to 3, further comprising a compression means in mutual engagement with the pawl (40), and acting on the latching part (42) to encourage it to move towards the röchet wheel (30); and wherein the compression means is arranged to at least partially cover the pawl (40) in the axial direction of the second axis.
    [5]
    5. Movement according to claim 4, the compression means being formed by a cantilever, one distal end (53) of which is in mutual engagement with the pawl (40); and of which an intermediate part (52) is arranged in a position further from the second axis (P) than the proximal end (51) and the distal end (53) thereof.
    [6]
    6. Timepiece equipped with a movement according to one of claims 1 to 5.
    类似技术:
    公开号 | 公开日 | 专利标题
    EP2827202B1|2018-03-21|Control device for a timepiece
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    同族专利:
    公开号 | 公开日
    JP2019128320A|2019-08-01|
    CN110083044A|2019-08-02|
    CN110083044B|2021-10-29|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JPS5542356B2|1972-12-22|1980-10-30|
    JPS52162172U|1976-06-03|1977-12-08|
    DE60040591D1|2000-03-20|2008-12-04|Audemars Piguet Renaud Et Papi|Ratchet drive mechanism for elevator wheel in a clock|
    ES2327350T3|2006-04-07|2009-10-28|Eta Sa Manufacture Horlogere Suisse|INVESTING MECHANISM FOR UNIDIRECTIONAL ROTARY DRIVING OF A MOBILE.|
    CN201302658Y|2008-12-01|2009-09-02|浙江西尔灵钟表有限公司|Movement device of progressive ringing mechanical alarm clock|
    JP5411081B2|2010-07-30|2014-02-12|セイコーインスツル株式会社|Hand-wound wheel train, watch movement equipped with the train wheel, and watch equipped with the movement|
    JP6040063B2|2013-03-12|2016-12-07|セイコーインスツル株式会社|Torque adjustment device, movement and mechanical watch|
    EP3185080B1|2015-12-22|2019-12-18|Montres Breguet S.A.|Timepiece mechanism comprising a pivoting member provided with magnetic return means|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    JP2018011773A|JP7023124B2|2018-01-26|Movement and watches|
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