Gear train for a timepiece movement

Abstract

The invention relates to a transmission mechanism for a timepiece movement. The transmission timepiece mechanism (1) comprises a driving wheel comprising a driving plate (40) intended to pivot about a first axis in response to the movement of the driving wheel and a linking element (2) having a flexible portion (36) and carrying a one-way transmission element (18, 20) arranged to cooperate with an output wheel (4) intended to drive the driving wheel when the latter is displaced in a first displacement direction, said linking element (2) comprising a base (6) fixed to the driving plate (40) and arranged to exhibit a rotational movement about a first fixed rotation axis in response to the movement of the driving wheel and a first arm (8, 10) extending from the base (6) and carrying the one-way transmission element (18, 20) at its distal end, the flexible portion (36) being arranged on the first arm (8, 10).

Description

Technical Field

[0001] The present invention relates to a transmission mechanism for a watch movement, the transmission mechanism being designed to transmit motion of a drive wheel of the watch movement to a driven wheel, the mechanism comprising a transmission wheel including: a drive plate designed to be kinematically linked to the drive wheel and to pivot about a first fixed axis of rotation in response to motion of the drive wheel; and a linking element having a flexible portion and supporting a one-way transmission element arranged to engage with a drive surface of an output wheel designed to be linked to the driven wheel and to drive the drive surface when the drive wheel is displaced in a first displacement direction.

[0002] According to a preferred embodiment, the present invention relates to an automatic winding mechanism that includes a transmission mechanism of this type to form a link between a winding mass and a mechanical energy storage device.

[0003] The present invention also relates to a watch movement having such a transmission mechanism and a watch including such a watch movement. Background Technology

[0004] This type of watch mechanism is already known in the prior art, especially regarding automatic winding mechanisms.

[0005] Therefore, for example, patent EP3203326B1 illustrates and describes a transmission mechanism matching the aforementioned features. More specifically, this transmission mechanism is designed to convert the bidirectional rotational motion of the winding block into a unidirectional motion, which ensures the winding of the collet spring. For this purpose, the mechanism includes a first rotating wheel designed to be driven in one direction or the other by the motion of the winding block. This first wheel has a transmission disc eccentric relative to the axis of rotation of the first wheel and is arranged to drive a transmission element by a circular translational motion. This transmission element then engages with a clutch element arranged to allow unidirectional rotational drive of an output wheel, which is designed to be linked to one end of the collet spring to ensure its loading. For this purpose, the transmission element has two drive surfaces, which may have an eccentric connection to the clutch element, each of which is associated with a given direction of rotation. For each direction of rotation of the winding block, the drive surfaces alternately move closer to and further away from the clutch element by means of the circular translational motion of the transmission element in a reciprocating motion. Therefore, the driving surface alternately engages with the clutch element to drive the clutch element to rotate in the same direction of rotation.

[0006] This structure requires high precision in the production and positioning of the various components involved to ensure that the trajectory of the drive surface allows for an effective eccentric connection to the clutch elements. Summary of the Invention

[0007] A primary objective of this invention is to provide a watch transmission mechanism having an alternative configuration that is more compact and responsively simplified compared to the conversion mechanism just described.

[0008] Therefore, the present invention relates more specifically to a transmission mechanism of the type described above, characterized in that the linking element includes a base fixed to a drive plate and arranged to exhibit rotational movement about a first fixed axis of rotation in response to the movement of a drive wheel; and the linking element includes a first arm extending from the base and having the unidirectional transmission element at its distal end, with a flexible portion arranged on the arm.

[0009] Because of these characteristics, the shape and size of the arm of the linking element (including the shape and size of its flexible portion) can be designed to ensure good unidirectional drive of the output wheel by the unidirectional transmission element, while driving the linking element according to simple rotational motion.

[0010] Preferably, the arm has at least one additional flexible portion.

[0011] This feature provides the builder of the mechanism with greater flexibility in choosing the arm type.

[0012] Typically, when the output wheel is intended to pivot about a second fixed axis of rotation, it may also be provided that the distal end of the arm is fixed to a radial guide arm, which is arranged to pivot about the second fixed axis of rotation while rotating freely relative to the output wheel.

[0013] In this case, a one-way drive element may also be provided, which is arranged at the distal end to be able to pivot about a third axis of rotation relative to the distal end, and has a contact surface arranged to have an eccentric relationship with the drive surface of the output wheel, such that: the contact surface drives the drive surface along a first relative rotational direction between the radial guide arm and the output wheel, and the contact surface is displaced from driving the drive surface along the opposite relative rotational direction between the radial guide arm and the output wheel.

[0014] Advantageously, it can then be provided that the arm or radial guide arm of the linking element has a resilient return element arranged to act on the unidirectional drive element and tend to position the unidirectional drive element in a predetermined rest position.

[0015] Typically, the linking element may be provided with a second arm having structural features similar to those of the first arm, and with an additional one-way drive element arranged to drive the drive surface of the output wheel when the drive wheel is displaced in a second displacement direction opposite to the first displacement direction.

[0016] Considering that the arm with at least one flexible part is associated with each of the unidirectional transmission elements, such a construction is less restrictive than the mechanism of the prior art described above, from the point of view of the production of the components and their arrangement.

[0017] In this case, it is advantageous to provide that the first arm and the second arm extend in corresponding approximate directions at an angle between 70 and 110 degrees relative to each other.

[0018] According to a preferred embodiment, the present invention relates to an automatic winding mechanism comprising a transmission mechanism that fully or partially matches the features just described, and the automatic winding mechanism comprising a winding block intended to be mounted on a frame element of a watch movement so as to be pivotable relative to the frame element and having a kinematic link with the drive plate.

[0019] In this case, it is preferable that the winding block is arranged to exhibit a low-amplitude oscillating motion, preferably less than 20 degrees, more preferably less than 10 degrees.

[0020] The present invention generally relates to a watch movement comprising a transmission mechanism matching the above features (regardless of whether the transmission mechanism is incorporated in an automatic winding mechanism) and a watch comprising such a watch movement. Attached Figure Description

[0021] Other features and advantages of the invention will become more apparent from the following detailed description of preferred embodiments given with reference to the accompanying drawings, which are provided by way of non-limiting example and are illustrated in the drawings:

[0022] Figure 1 A schematic diagram of a portion of the transmission mechanism according to the present invention is shown, which allows for the explanation of the operating principle of the transmission mechanism;

[0023] Figure 2 A simplified perspective view of a portion of a transmission mechanism according to a preferred embodiment of the present invention, viewed from a first perspective, is shown; and

[0024] Figure 3a and Figure 3b This shows the view from the second side and is in two different corresponding operational phases. Figure 2 The same front view of the transmission mechanism. Detailed Implementation

[0025] The following detailed description will depict a watch transmission mechanism according to a preferred embodiment of the invention as an illustrative and non-limiting example. More specifically, according to the illustrated and described embodiments, the transmission mechanism is intended to be incorporated into the automatic winding mechanism of a watch; however, it will be apparent to those skilled in the art that the transmission mechanism according to the invention will be able to implement, relative to other types of watch mechanisms, without departing from the scope of the invention as defined by the claims.

[0026] Figure 1 A schematic diagram of a portion of the transmission mechanism 1 according to the present invention is shown, which allows for the explanation of the operating principle of the transmission mechanism.

[0027] Typically, the transmission mechanism 1 according to the invention is intended to convert the bidirectional rotational motion of the drive wheel (not shown) into the unidirectional rotational motion of the driven wheel. For this purpose, the transmission mechanism 1 specifically includes a linking element 2, which is intended to be driven by the motion of the drive wheel in a bidirectional rotation and, consequently, to drive the output wheel 4 according to the unidirectional rotational motion.

[0028] When the transmission mechanism 1 according to the invention is incorporated into an automatic winding mechanism, the transmission mechanism can be advantageously arranged to convert the bidirectional rotational motion of the winding block (not shown) into a unidirectional rotational motion, which is then transmitted to a mechanical energy storage element to load it with mechanical energy, the mechanical energy storage element being typically a cylindrical spring (not shown).

[0029] Back Figure 1 The schematic diagram shows that the linking element 2 includes a base 6, which is designed to be mounted on the frame element of the watch movement for rotation.

[0030] The base 6 has two arms 8 and 10 that extend toward the periphery of the output wheel 4 in a generally inclined direction relative to each other. In the case of an automatic winding mechanism, these two arms are designed to be kinematically linked to the mechanical energy storage element.

[0031] Each of the arms 8 and 10 includes a support 14 or 16 at its distal end, on which a one-way drive element 18 or 20, having the form of a generally circular wheel, is mounted for rotation on rotation axes 22 and 24. Finally, in this exemplary embodiment, radial guide arms 26 and 28 are provided to link each support 14 or 16 to the rotation axis 30 of the output wheel 4, and thus maintain the corresponding rotation axes 22 and 24 at a constant distance from the rotation axis 30.

[0032] It can be seen that each of the rotation axes 22 and 24 is slightly offset relative to the rotation axis 30 passing through the output wheel 4 and the radius of the contact point between the output wheel and the corresponding one-way transmission element. In addition, each rotation axis 22 and 24 is preferably slightly off-center relative to the circular periphery of the corresponding one-way transmission element, which defines the contact surface that contacts the output wheel 4.

[0033] Therefore, from Figure 1 Starting with the configuration shown, it can be seen that if the one-way drive element 18 pivots in a clockwise direction, the radius of the one-way drive element 18 will become increasingly larger along the rotation axis 30 passing through the output wheel 4 and the radius of the contact point between the output wheel and the one-way drive element 18. Figure 1 This occurs in the view when link element 2 is rotated clockwise.

[0034] The distance between the rotation axis 22 of the one-way drive element 18 and the periphery of the output wheel 4 remains constant. The pivoting of the one-way drive element 18 will, after a certain period, create an eccentric connection with the output wheel 4. That is, the radius between the one-way drive element's rotation axis 22 and its contact point with the periphery of the output wheel 4 becomes sufficiently large to prevent eccentric connection with the output wheel 4 from occurring during free pivoting of the one-way drive element 18. From then on, due to the significant friction generated between the output wheel 4 and the one-way drive element 18, the linking element 2 rotates in the same direction (in... Figure 1 Any subsequent rotation on the axis (clockwise in the view) also drives the output wheel 4 to rotate in the same direction of rotation, and the one-way drive element 18 is no longer able to pivot on its axis of rotation 22.

[0035] Conversely, when link element 2 is in Figure 1 In the view, when rotated counterclockwise, the one-way drive element 18 also rotates counterclockwise. By following this movement, the radius of the one-way drive element between its axis of rotation 22 and its contact point with the periphery of the output wheel 4 tends to decrease. Therefore, the one-way drive element 18 can rotate freely relative to the output wheel 4 (again, if it is in the case of an eccentric link). Therefore, when the link element 2 pivots in the counterclockwise direction of rotation, the one-way drive element 18 does not drive the output wheel 4 to rotate.

[0036] from Figure 1As can be seen, another one-way drive element 20 is mounted on its support 16 in a manner similar to that of one-way drive element 18. However, arms 8 and 10 extend on either side of a straight line passing through the center of the link element 2 and the output wheel 4. Therefore, for a given direction of rotation of the link element 2, the two one-way drive elements 18 and 20 engage with the periphery of the output wheel 4 such that they pivot in their respective opposite directions of rotation. Thus, each of the one-way drive elements 18, 20 is associated with a given direction of rotation of the link element 2, in which each of the one-way drive elements 18, 20 has an eccentric connection with the output wheel 4 to drive the output wheel 4 to rotate.

[0037] exist Figure 1 In the configuration shown, the clockwise rotation of the linking element 2 thus drives the one-way drive element 18 to rotate in the same direction. This tends to place the one-way drive element 18 in an eccentric connection with the output wheel 4 to drive the output wheel in a clockwise direction of rotation. At the same time, the one-way drive element 20 rotates freely in a counterclockwise direction without exerting any specific action on the periphery of the output wheel 4.

[0038] Conversely, the rotation of the linking element 2 in the counterclockwise direction drives the one-way transmission element 18 to rotate freely relative to the output wheel 4 in the same direction. At the same time, the one-way transmission element 20 rotates in the clockwise direction, which tends to place it in an eccentric connection with the output wheel 4 to drive the output wheel 4 to rotate in the clockwise direction.

[0039] Therefore, regardless of the rotation direction of the linking element 2, the one-way transmission elements 18 and 20 alternately ensure that the output wheel 4 is driven in the same direction.

[0040] It should be noted that the return spring 32 is preferably associated with each one-way drive element 18, 20 by cooperating with the pin 34 fixed to the one-way drive element 18, 20, to prevent its orientation from moving too far from the orientation in which the eccentric interaction with the output wheel 4 occurs, and thus ensures greater responsiveness of the drive mechanism according to the invention, especially when the drive direction of the link element 2 changes.

[0041] Clearly, the operating principle just described can be implemented using a single arm carrying a single unidirectional drive element. In this case, when the drive mechanism is incorporated into, for example, an automatic winding mechanism, the single direction of rotation of the winding block will contribute to the loading of the mechanical energy storage element.

[0042] According to a preferred embodiment of the invention, but in a non-limiting manner, each of the arms 8, 10 has two flexible portions 36 between its proximal end, which is fixed to the base 6 of the linking element 2, and its distal end, which includes corresponding supports 14, 16. These two flexible portions 36 are designed to allow the arms 8, 10 to deform when the linking element 2 is driven to rotate, while ensuring proper guidance of the corresponding one-way transmission devices 18, 20.

[0043] Those skilled in the art will have no particular difficulty in adjusting the form of the arm to suit their specific needs, and in particular, in modifying the number of its flexible portions without departing in any way from the scope of the invention as defined by the claims.

[0044] In the case where the transmission mechanism comprises two arms 8, 10, the arms 8, 10 can advantageously have an angle of approximately 70 to 110 degrees between them; however, it will obviously be able to adjust this indicated value according to the final form used for production arms and according to the number of flexible parts they include. In this regard, it should also be noted that the two arms do not necessarily include the same number of flexible parts.

[0045] Figure 2 A simplified perspective view of a portion of the transmission mechanism 1 according to a preferred embodiment of the present invention, viewed from a first perspective, is shown, thereby allowing for a better understanding of certain configuration details. Furthermore, Figure 3a and Figure 3b This shows the view from the second side and is in two different corresponding operational phases. Figure 2 The same front view of transmission mechanism 1.

[0046] According to this embodiment, which is illustrated as a non-limiting example, the linking element 2 is associated with a drive plate 40 to define a drive wheel, the drive plate 40 having teeth and being rotatably fixed to the base 6. The drive plate 40 is intended to have a kinematic link with the drive wheel (e.g., a winding block) via its teeth to ensure the drive of the base 6 and thus the drive of the arms 8, 10.

[0047] Alternatively, the drive plate 40 can, of course, be manufactured as a single workpiece with the base 6 without departing from the scope of the invention, and / or can include other linking devices linked to the drive wheel. In fact, other linking methods between the linking element 2 and the drive wheel can be implemented without departing from the scope of the invention in any way.

[0048] The output wheel 4 includes a drive surface defined by the periphery of a first driven wheel 42, which is arranged to engage with the peripheral contact surfaces of one-way transmission elements 48, 50 by friction and is fixed to a toothed drive wheel 44, which is intended to have a kinematic link with a driven wheel (not shown) (e.g., a coiled ratchet of a cylindrical spring). Therefore, the one-way transmission elements 48, 50 are intended to drive the first driven wheel 42 in a single direction of rotation, such that the toothed drive wheel 44 can drive the driven wheel to rotate in the same direction, regardless of the direction of rotation of the drive wheel. Alternatively, the driven wheel may be directly driven by the output wheel 4.

[0049] It should be noted that the unidirectional transmission elements 48 and 50 here have the same characteristics as... Figure 1 The conveying elements shown take different forms. In fact, each of these elements takes the form of a pad with a slight asymmetry relative to its intermediate plane. From Figure 3a and Figure 3b A closer look reveals that the radius of each pad is slightly larger on the left side of its central plane than on the right.

[0050] The drive plate 40 is arranged to engage with an intermediate link wheel 52, which is intended to be driven to rotate by the drive wheel. Figure 2 , Figure 3a and Figure 3b The embodiment shown provides the drive wheel with small oscillations around the equilibrium position in a non-limiting manner, such that the intermediate link wheel 52 is driven to exhibit a reciprocating motion similar to that of the link element 2.

[0051] Figure 3a The operation of the transmission mechanism 1 is illustrated when the intermediate link wheel 52 is driven to rotate clockwise. Consequently, the link element 2 is driven to rotate counterclockwise, and the distal ends of the arms 8 and 10 move away from the base 6 of the link element 2. In this case, Figure 3a In the view, the one-way drive element 50 engages with the first driven wheel 42 to pivot in a clockwise direction of rotation, while element 48 pivots in a counterclockwise direction of rotation. In this configuration, element 50 exhibits a radius that increases with respect to the first driven wheel 42, while element 48 exhibits a radius that decreases with respect to the same wheel 42. Therefore, element 50 is eccentrically related to the first driven wheel 42, while element 48 rotates freely without acting on the same wheel 42. This is... Figure 3a The view is reflected by the drive of the first driven wheel 42 in the clockwise rotation direction, as shown by arrow H.

[0052] Figure 3bThe operation of the transmission mechanism 1 is illustrated when the intermediate link wheel 52 is driven to rotate counterclockwise. Consequently, the link element 2 is driven to rotate clockwise, and the distal ends of the arms 8 and 10 move closer to the base 6 of the link element 2. In this case, Figure 3b In the view, the one-way drive element 50 engages with the first driven wheel 42 to pivot counterclockwise, while element 48 pivots clockwise. In this configuration, element 48 exhibits a radius that increases with respect to the first driven wheel 42, while element 50 exhibits a radius that decreases with respect to the same wheel 42. Therefore, element 48 is eccentrically positioned with respect to the first driven wheel 42, while element 50 rotates freely without acting on the same wheel 42. This again... Figure 3b The view is reflected by the drive of the first driven wheel 42 in the clockwise rotation direction, as shown by arrow H.

[0053] As previously explained, with each change in the direction of rotation, the one-way drive elements 48 and 50, which are eccentrically related to the first driven wheel 42, rapidly move away from this state, thus presenting a reduced radius, allowing the one-way drive elements to pivot without interacting with the first driven wheel 42. Conversely, the other one-way drive element rapidly presents an increased radius relative to the first driven wheel 42 and forms an eccentric relationship with it.

[0054] By utilizing the features just proposed, a clock mechanism is obtained that transmits rotational motion between the driving and driven wheels in a unidirectional manner. This mechanism exhibits a simple, precise, and reliable configuration and assembly pattern. Furthermore, compared to the aforementioned prior art solutions, this mechanism operates with less friction, thus providing excellent efficiency.

[0055] The implementation of the present invention is not limited to the precise geometry of the various components of the mechanisms already illustrated and described. In fact, those skilled in the art will not have particular difficulty adapting this teaching to implementations of transmission mechanisms that match the features of the present invention by implementing multiple arms of the linking elements to suit their specific needs, such as the number and arrangement of their flexible portions, or even the form of the unidirectional transmission elements or the way they are positioned in the transmission mechanism.

[0056] As described above, this transmission mechanism is perfectly suited for integration into an automatic winding mechanism to transmit the bidirectional motion of the winding block to the mechanical energy storage element, but it can be implemented relative to any other suitable type of watch system without departing from the scope of the invention. It should be noted that, in this case, the winding block can advantageously be arranged to exhibit a low-amplitude oscillating motion, preferably less than 20 degrees, more preferably less than 10 degrees, to facilitate a compact configuration of the automatic winding mechanism.

Claims

1. A transmission mechanism (1) for a watch movement, the transmission mechanism (1) being designed to transmit motion from a drive wheel to a driven wheel of the watch movement, the transmission mechanism (1) comprising: A drive wheel, comprising: a drive plate (40) kinematically linked to the drive wheel and pivoting about a first fixed axis of rotation in response to the movement of the drive wheel; and a linking element (2) having a flexible portion (36) and a one-way drive element (18) arranged to engage with a drive surface of an output wheel (4) of the driven wheel, which is intended to rotate about a second fixed axis of rotation (30) and is intended to be linked to the driven wheel, and drives the drive surface when the drive wheel is displaced in a first displacement direction. The linking element (2) is characterized in that it includes a base (6) which is fixed to the drive plate (40) and is arranged to exhibit rotational motion about the first fixed axis of rotation in response to the motion of the drive wheel. The linking element (2) includes a first arm (8) extending from the base (6) and having the one-way drive element (18) at its distal end. The flexible portion (36) is arranged on the first arm (8), and the distal end of the first arm (8) is fixed to a radial guide arm (26) arranged to pivot about the second fixed axis of rotation (30) while rotating freely relative to the output wheel (4).

2. The transmission mechanism (1) according to claim 1, characterized in that, The first arm (8) has at least one additional flexible portion.

3. The transmission mechanism (1) according to claim 1, characterized in that, The unidirectional transmission element (18) is arranged on the distal end to be able to pivot about the third axis of rotation (22) relative to the distal end, and has a contact surface arranged to be eccentrically related to the drive surface of the output wheel (4), such that: The contact surface drives the driving surface along a first relative rotational direction between the radial guide arm (26) and the output wheel (4); and The contact surface is displaced so that the drive surface is not driven in the opposite relative rotational direction between the radial guide arm (26) and the output wheel (4).

4. The transmission mechanism (1) according to claim 2, characterized in that, The unidirectional transmission element (18) is arranged on the distal end to be able to pivot about the third axis of rotation (22) relative to the distal end, and has a contact surface arranged to be eccentrically related to the drive surface of the output wheel (4), such that: The contact surface drives the driving surface along a first relative rotational direction between the radial guide arm (26) and the output wheel (4); and The contact surface is displaced so that the drive surface is not driven in the opposite relative rotational direction between the radial guide arm (26) and the output wheel (4).

5. The transmission mechanism (1) according to claim 3, characterized in that, The first arm (8) or the radial guide arm (26) has an elastic return element (32) which is arranged to act on the one-way drive element (18) and tend to position the one-way drive element (18) in a predetermined rest position.

6. The transmission mechanism (1) according to claim 4, characterized in that, The first arm (8) or the radial guide arm (26) has an elastic return element (32) which is arranged to act on the one-way drive element (18) and tend to position the one-way drive element (18) in a predetermined rest position.

7. The transmission mechanism according to any one of claims 1 to 6, characterized in that, The linking element (2) has a second arm (10) extending from the base (6) and having at least one flexible portion (36), and has an additional one-way drive element (20) arranged to drive the drive surface of the output wheel (4) when the drive wheel is moved in a second displacement direction opposite to the first displacement direction.

8. The transmission mechanism according to claim 7, characterized in that, The first arm (8) and the second arm (10) extend in corresponding directions at an angle between 70 and 110 degrees relative to each other.

9. An automatic winding mechanism comprising a transmission mechanism (1) according to any one of claims 1 to 6, characterized in that, The automatic winding mechanism includes a winding block designed to be mounted on the frame element of the watch movement so as to be pivotable relative to the frame element and to have a kinematic link with the drive plate (40).

10. The automatic winding mechanism according to claim 9, characterized in that, The winding block is arranged to exhibit an oscillating motion with an amplitude of less than 20 degrees.

11. An automatic winding mechanism comprising the transmission mechanism (1) according to claim 7, characterized in that, The automatic winding mechanism includes a winding block designed to be mounted on the frame element of the watch movement so as to be pivotable relative to the frame element and to have a kinematic link with the drive plate (40).

12. The automatic winding mechanism according to claim 11, characterized in that, The winding block is arranged to exhibit an oscillating motion with an amplitude of less than 20 degrees.

13. An automatic winding mechanism comprising the transmission mechanism (1) according to claim 8, characterized in that, The automatic winding mechanism includes a winding block designed to be mounted on the frame element of the watch movement so as to be pivotable relative to the frame element and to have a kinematic link with the drive plate (40).

14. A watch movement comprising a transmission mechanism (1) according to any one of claims 1 to 6.

15. A watch movement comprising the transmission mechanism (1) according to claim 7.

16. A watch movement including an automatic winding mechanism according to claim 9, wherein the output wheel (4) includes a toothed drive wheel (44) having a kinematic link with an end of an elastic mechanical energy storage element so as to enable loading of the elastic mechanical energy storage element.

17. A watch movement including an automatic winding mechanism according to claim 10, wherein the output wheel (4) includes a toothed drive wheel (44) having a kinematic link with an end of an elastic mechanical energy storage element so as to enable loading of the elastic mechanical energy storage element.

18. A watch movement including the winding mechanism according to claim 13, wherein the output wheel (4) includes a toothed drive wheel (44) having a kinematic link with an end of an elastic mechanical energy storage element so as to enable loading of the elastic mechanical energy storage element.

19. A watch comprising a watch movement according to claim 14.

20. A watch comprising a watch movement according to claim 15.

21. A watch comprising the watch movement according to claim 17.

22. A watch comprising the watch movement according to claim 18.

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