Actuation system for timepiece movement, timepiece movement and timepiece

Abstract

The utility model relates to an actuating system (20) for a clock movement, the actuating system (20) is configured to enable a component to at least partially shift among a plurality of positions, and the actuating system (20) comprises a micromechanical actuator (30) which is intended to be jointed with the component. The utility model relates to an actuation system for a timepiece movement, comprising an actuator (30) comprising a stationary part (33) intended to be mounted such as to remain stationary with respect to a plate of the timepiece movement, and a movable part (37) movable with respect to the stationary part (33), the actuator (30) comprising a spring part (35) connecting the movable part (37) to the stationary part (33), the spring part (35) carrying the movable part (37), the actuation system further comprising a setting device, the setting means cooperate with the actuator (30) so as to be able to displace the movable portion (37) of the actuator (30) between a plurality of positions, the spring portion (35) comprising a guide with flexible vanes. The utility model also relates to a clock movement comprising the actuating system and a clock comprising the clock movement.

Description

Technical Field

[0001] The present utility model relates to the field of mechanical watch manufacturing.

[0002] More specifically, the present utility model relates to a micromechanical actuation system with a flexible guide for the watchmaking industry. Background Art

[0003] In the field of micromechanical devices, micromechanical actuation systems are used to transfer motion between two elements of a micromechanical device.

[0004] For example, in the watchmaking field, to trigger or actuate a specific watch module of a movement, buttons, levers or rockers are known, which are arranged in a mechanical movement and enable the transfer of motion or force between two components of the movement.

[0005] Such an actuation system particularly includes an actuator that engages with the component to be actuated, and the actuator can be a gear or a setting element.

[0006] These actuators usually need to be precise enough for certain applications, where the displacement of the actuator must be controlled very precisely.

[0007] In addition, play between the components of the actuator should be avoided to obtain the required precision and prevent hysteresis. More specifically, some actuation systems include multiple components connected by contact.

[0008] Some actuators include a stationary component assembled on a support, such as a pivot mounted on a mainplate, and a component movable relative to the stationary component, such as a lever pivoting around the pivot. To move the movable component while avoiding play between the components, a return force is applied to the movable component by a spring to hold the movable component in place or push the movable component. In the case of the lever, the spring holds the lever in a reference position.

[0009] To move the lever, a support pushes the lever from the reference position to the module actuation position. When the support retracts, the lever returns to its initial position under the action of the spring.

[0010] However, for certain functions, these actuation systems are not precise and sensitive enough, especially for setting devices, which require the actuator to have multiple precise positions. Summary of the Utility Model

[0011] The object of the present utility model is to overcome some or all of the above defects by providing a high-precision actuation system for a watch movement.

[0012] To this end, the present utility model relates to an actuation system for a watch movement, the actuation system being configured to be able to at least partially displace a component between a plurality of positions. The actuation system includes a micromechanical actuator intended to engage with the component. The micromechanical actuator includes a stationary portion intended to be mounted, for example, stationary relative to the mainplate of the watch movement, and a movable portion capable of moving relative to the stationary portion. The actuator includes a spring portion connecting the movable portion to the stationary portion, the spring portion supporting the movable portion. The actuation system further includes setting means cooperating with the actuator so as to be able to displace the movable portion of the actuator between a plurality of positions.

[0013] The present utility model is characterized in that the spring portion includes a guide having flexible blades.

[0014] Thereby, the present utility model provides an actuation system with a high-precision actuator, because the actuator can occupy a large number of closely spaced positions. In addition, the spring portion of the actuation system avoids problems related to play.

[0015] According to a specific embodiment of the present utility model, the guide having flexible blades includes at least two translation stages / translation levels arranged in series, wherein the first translation stage is connected to the stationary portion, and the last translation stage is connected to the movable portion.

[0016] According to a specific embodiment of the present utility model, each translation stage includes a pair of flexible blades that are substantially parallel, and a rigid section on which the pair of flexible blades is mounted.

[0017] According to a specific embodiment of the present utility model, two consecutive translation stages are arranged end-to-end relative to each other.

[0018] According to a specific embodiment of the present utility model, the actuation system includes an even number of translation stages.

[0019] According to a specific embodiment of the present utility model, the rigid section is elongated so that the next translation stage can be associated with the rigid section.

[0020] According to a specific embodiment of the present utility model, at least the spring portion is substantially defined in a plane and is thus substantially flat. Preferably, the movable portion or even the stationary portion is also like this.

[0021] According to a specific embodiment of the present utility model, at least the second translation stage is arranged on a first side of the first translation stage, the first side facing away from the movable portion with respect to the first translation stage.

[0022] According to a specific embodiment of the present invention, at least the last translation stage is arranged on the second side of the first translation stage, and the second side faces the movable part.

[0023] According to a specific embodiment of the present invention, the rigid section of the translation stage arranged on the first side and farthest from the first translation stage extends to the translation stage arranged on the second side to form the outer peripheral side of the spring part.

[0024] According to a specific embodiment of the present invention, each rigid section of the translation stage extends beyond the pair of flexible blades of the translation stage.

[0025] According to a specific embodiment of the present invention, the spring part is arranged below the stationary part.

[0026] According to a specific embodiment of the present invention, when the actuator is in the rest position, the flexible blades of the translation stage of the spring part are substantially parallel.

[0027] According to a specific embodiment of the present invention, the movable part includes a hook portion.

[0028] According to a specific embodiment of the present invention, the actuator is made as a single piece, and the actuator is obtained by a process such as using LIGA type or DRIE type.

[0029] According to a specific embodiment of the present invention, the movable part has an elbow shape and is formed by a first section arranged perpendicular to the rigid section of the last translation stage and a second section forming a right angle with the first section.

[0030] The present invention also relates to a timepiece movement including such an actuation system.

[0031] The present invention also relates to a timepiece including such a timepiece movement, such as a wristwatch. Description of the Drawings

[0032] From the following detailed description of several embodiments given by way of non-limiting examples with reference to the accompanying drawings, the objects, advantages and features of the present invention will become apparent, in the drawings:

[0033] - Figure 1 A perspective view schematically showing a speed regulation mechanism according to an embodiment of the present invention, the speed regulation mechanism being arranged in a timepiece movement and including an actuation system;

[0034] - Figure 2 Schematically shows Figure 1 A perspective view of a part of the speed regulation mechanism shown in

[0035] - Figure 3 Schematically shows a top view of a part of the speed regulating mechanism shown in Figure 1 without the balance spring holder and bearings;

[0036] - Figure 4 Schematically shows a top view of the hairspring of the speed regulating mechanism shown in Figure 1 ;

[0037] - Figure 5 Schematically shows a side view of the actuator of the actuation system of the speed regulating mechanism in Figure 1 ;

[0038] - Figure 6 Schematically shows a side view of the actuator of the actuation system in Figure 5 mounted on the balance spring holder;

[0039] - Figure 7 Schematically shows an enlarged perspective view of the actuator and the offset lever of the actuation system of the speed regulating mechanism;

[0040] - Figure 8 Schematically shows a bottom view of the speed regulating mechanism in Figure 1 ;

[0041] - Figure 9 Schematically shows an enlarged perspective view of the actuator and the offset lever of the actuation system of the speed regulating mechanism in the first position; and

[0042] - Figure 10 Schematically shows an enlarged perspective view of the actuator and the offset lever of the actuation system of the speed regulating mechanism in the second position. DETAILED DESCRIPTION

[0043] In the following description, the actuation system that is the subject of the present invention is configured to actuate a device for adjusting the timekeeping error of a clock speed regulating mechanism. However, such an actuation system can be used for other applications in a clock movement and is not limited to applications in the speed regulating mechanism.

[0044] Figures 1 to 3 Schematically shows an embodiment of a speed regulating mechanism 1 intended to be arranged in a clock movement, which clock movement includes a main plate (not shown in the figure) provided with a recess. For example, such a movement is arranged in a clock such as a watch.

[0045] The speed regulating mechanism 1 includes: an inertial mass body, in this example a ring-shaped balance wheel 23; a hairspring 25 as an elastic restoring element of the inertial mass body, which is configured to oscillate the inertial mass body; a balance staff 24; and a balance spring holder 22. These elements are stacked in the following order from bottom to top: the balance wheel 23, the hairspring 25, and the balance spring holder 22.

[0046] The balance staff 24 passes through the centers of the balance wheel, the hairspring 25, and the balance cock 22. The balance staff 24 is held by two shock-absorbing bearings 28 disposed at both ends of the balance staff 24. The first bearing is disposed below the balance cock 22, and the second bearing 28 is disposed above the balance cock 22. The balance cock 22 has a through hole, and the second bearing 28 is held within the through hole.

[0047] As Figure 3 and 4 shown, the hairspring 25 preferably extends substantially in a plane. The hairspring 25 includes a flexible strip 2 wound around itself several turns, and the strip 2 has a predetermined stiffness. The inner end 9 of the strip 2 is integral with or assembled to a rigid support 3, which is commonly referred to as the inner collet. The rigid support 3 is substantially triangular and is assembled around the balance staff 24.

[0048] The hairspring 25 further includes an adjusting device for adjusting its stiffness. For example, when the speed regulating mechanism is installed in the main plate of the watch movement, the adjusting device can be actuated by the user in particular.

[0049] The adjusting device includes a flexible element 5, which is arranged in series with the strip 2, that is, immediately after the strip. Preferably as an extension of the strip, the flexible element 5 connects the outer end 4 of the strip 2 to the rigid support 17. The flexible element 5 is integral with the outer end 4 of the strip 2. The flexible element 5 is an element distinct from the strip 2.

[0050] The flexible element 5 adds additional stiffness to the strip 2. The flexible element 5 is preferably stiffer than the strip 2. In this case, the flexible element 5 is arranged as an extension of the strip 2. Preferably, the adjusting device is integral with the strip 2 or even made of the same material, such as silicone resin.

[0051] The flexible element 5 of the hairspring 25 includes a first flexible blade 19 and a movable semi-rigid portion 18, which extends from the outer end of the strip 2 and is connected to the first flexible blade 19, which is preferably on the same side as the rigid portion 18. The first flexible blade 19 is also connected to the rigid support 17.

[0052] The rigid support 17 is L-shaped, where the first leg 46 of the L serves as a connecting member with the first flexible blade 19, and the second leg 47 of the L faces away from the first flexible blade 19 so that it can be assembled to the watch movement.

[0053] The adjusting device for adjusting the hairspring 25 further includes a prestressing device 6, which is used to apply a variable force or torque to the flexible element 5. In this way, the stiffness of the hairspring can be adjusted. Due to the prestressing device 6, it is possible to continuously adjust the torque or force. In other words, the torque or force is not limited to isolated values. Therefore, the stiffness of the flexible element 5 can be adjusted very precisely.

[0054] The prestressing device 6 includes a second flexible blade 21, which is arranged on the opposite side of the rigid part 18 and is located within the extension range of the first flexible blade 19.

[0055] The other end of the second flexible blade 21 is connected to a curved rod 14 that extends around the strip 2. In addition to the second flexible blade 21, the rod 14 is also connected to a semi-rigid structure 27 attached to the rigid support 17. When the rod 14 is actuated by a force or torque, the semi-rigid structure 27 will be partially deformed.

[0056] The force or torque is applied to the free end 15 of the rod 14. In this way, the rod 14 of the prestressing device 6 transfers the force or torque to the flexible element 5 via the second flexible blade 21 and the semi-rigid structure 27 in order to modify the stiffness of the hairspring 25.

[0057] In order to be able to apply a variable force or torque to the hairspring 25, the speed regulating mechanism includes a specific actuation system 20 according to the present utility model.

[0058] The actuation system 20 is configured to be able to at least partially displace a component between multiple positions. In this embodiment, the component is the rod 14 of the prestressing device 6.

[0059] In Figures 1 to 3 In the illustrated embodiment, the speed regulating mechanism 1 includes an outer stud holder 31 provided with a suspended outer stud 34. The outer stud holder 31 is mechanically connected to the flexible element 5 but does not block the strip 2. The outer stud holder 31 surrounds the second bearing 28. For this purpose, the outer stud holder 31 includes a central ring 38 arranged around the second bearing 28, and the central ring 38 rests on the balance staff plate 22.

[0060] The outer stud 34 cooperates with the second leg 47 of the rigid support 17. In this way, the prestressing device 6 and the flexible element 5 are supported by the outer stud holder 31 that suspends them.

[0061] In addition, the outer stud 34 is rigidly attached to the rigid support 17. In other words, the outer stud 34 is integral with the rigid support 17. The outer stud 34 and the hairspring 25 are assembled, for example, by adhesion, brazing, welding, deformation of metallic glass, or mechanical fastening.

[0062] The outer stud 34 is capable of moving relative to the balance bridge plate. To this end, the outer stud holder 31 is capable of rotating relative to the balance bridge plate 22 about the second bearing 28. The outer stud holder 34 can be displaced, for example, over an angular range of 20° or even 10°.

[0063] By displacing the outer stud 34 relative to the balance bridge plate 22, the yaw of the speed regulation mechanism 1 can be adjusted.

[0064] The actuation system 20 further includes an actuator 30, which is configured to actuate the rod 14. The actuator 30 is mechanically connected to the prestressing device 6, and the actuator 30 is configured to perform at least partially a preferably substantially linear or even rectilinear displacement in order to actuate the prestressing device 6.

[0065] In other words, at least a part of the actuator 30 moves substantially along a straight line, different from, for example, the outer stud holder 31 that rotates by rotating about an axis. In this way, at least a part of the actuator 30 moves towards or away from the hairspring 25 in a direction substantially oriented towards the hairspring.

[0066] Preferably, the displacement direction of the actuator 30 is substantially radial with respect to the balance wheel 23 and the hairspring 25. In this way, the straight line along which the actuator 30 moves points to the center of the balance wheel 23 and the hairspring 25. This also makes the setting of the time difference independent of the setting of the yaw.

[0067] The actuator 30 is eccentric with respect to the speed regulation mechanism, that is, it is mounted at a certain distance from the center of the speed regulation mechanism 1 and is only connected to the rod 14 of the adjusting device. Therefore, the actuator 30 is not directly mounted on the speed regulation mechanism 1, for example, mounted on the bearing 28 of the speed regulation mechanism 1 like the outer stud holder.

[0068] In this embodiment, the actuator 30 is mounted on the balance bridge plate 22. Preferably, the actuator 30 is mounted substantially perpendicular to the plane of the balance bridge plate 22. More specifically, the actuator 30 is assembled on the edge of the balance bridge plate 22.

[0069] In Figure 5 and 6In it, the actuator 30 particularly includes a stationary part 33 designed to be mounted, for example, stationary relative to the main plate of the timepiece movement, a movable part 37 movable relative to the balance cock 22 and connected to the rod 14, and a spring part 35 connecting the movable part 37 to the stationary part 33. In this example, the stationary part 33 is mounted on the balance cock 22 and is thus stationary relative to the balance cock 22. The stationary part 33 and the movable part 37 are preferably rigid. The stationary part 33, the spring part 35, and the movable part 37 are arranged in the same plane. Thus, the actuator 30 is generally flat and extends substantially in one plane. The actuator 30 is preferably made as a single piece, where the actuator 30 can be obtained, for example, by a lithography process of the LIGA type or by a deep reactive ion etching process of the DRIE type.

[0070] To actuate the rod 14, the actuator 30 includes a hook part 39 engaging with the rod 14, and the hook part 39 is mounted on the movable part 37. The hook part 39 at least partially surrounds the rod 14, but can also surround the rod 14 to close.

[0071] The radial displacement of the movable part 37 of the actuator 30 will radially pull or push the rod 14 relative to the hairspring 25. This will change the stiffness of the flexible element 5, because the displacement of the rod 14 exerts a greater or smaller force or torque on the flexible element 5, causing the stiffness of the flexible element 5 to change, and thus the overall stiffness of the hairspring 25 also changes. Therefore, the actuation system 20 allows the adjustment of the rate difference of the speed regulating mechanism 1.

[0072] Here, the stationary part 33 has a substantially square shape and is provided with at least one attachment notch 41, preferably two attachment notches 41, 42, and each attachment notch is respectively used to receive the posts 43, 44 extending from the balance cock 22. The attachment notches 41, 42 are arranged, for example, on the diagonally opposite sides of the stationary part 33.

[0073] Each notch 41, 42 is respectively provided with a flexible tongue 48, 49 arranged in the notch 41, 42. The first notch 41 is open on the side so that it can slide laterally around the first post 43. The second notch 42 is closed and can receive the second post 44 by inserting it into the second notch 42. When the posts 43, 44 enter the notches 41, 42, the flexible tongues 48, 49 are deformed and serve as supporting means to hold the posts 43, 44 in the notches 41, 42. In addition, the flexible tongues 48, 49 enable the improvement of the positioning accuracy by overcoming the play when the posts 43, 44 are positioned in the notches 41, 42 (preferably in the same direction).

[0074] As shown in the figure, the actuator 30 is mounted on the balance cock 22 so as to be substantially perpendicular to the main plate and the balance cock 22. Thus, the actuator 30 is mounted on the edge of the balance cock 22.

[0075] Spring portion 35 is arranged below stationary portion 33 in such a way that it extends below the level of balance cock 22 .

[0076] According to the invention, the spring portion 35 comprises a flexible guide. In this example, the flexible guide comprises a plurality of translation stages / translation stages 51, 52, 53, 54 with flexible blades arranged in series one after another. They are defined as "in series" because the displacement of each translation stage is at least partially cumulative.

[0077] Each translation stage 51, 52, 53, 54 comprises a pair of substantially parallel flexible blades 61, 62, 63, 64, and a rigid section 56, 57, 58, 59 on which the pair of flexible blades 61, 62, 63, 64 are mounted.

[0078] The first translation stage 51 is arranged below the stationary part 33 and has a first rigid section 56 which is lengthened so as to be associated with the second translation stage 52 which is arranged end to end with the first translation stage 51. In this way, the second pair of flexible blades 52 is substantially parallel to the first pair of flexible blades 51. The second rigid section 57 is substantially parallel to the first rigid section 56 but offset by half the length of the first rigid section.

[0079] The second rigid section 57 is also lengthened to associate the third translation stage 53 with the second translation stage 52 in an end-to-end arrangement and thus the third translation stage 53 is substantially parallel to the first translation stage 51. The third pair of flexible blades 63 is substantially parallel to the first and second pairs of flexible blades 61,62.

[0080] The actuator 30 includes a fourth translation stage 54, which is arranged on a different side of the first translation stage 51 from the second translation stage 52 and the third translation stage 53. The fourth translation stage 54 is arranged end to end with the third translation stage 53.

[0081] In this manner, the fourth pair of flexible blades 64 are substantially parallel to the other pairs of flexible blades, and the fourth section 59 is arranged in substantially the same direction as the second section 57 .

[0082] The third translation stage 53 and the fourth translation stage 54 are connected by an arm 55 , which extends from the third section 58 and passes under the first rigid section 56 of the first translation stage 51 .

[0083] This arrangement of translation stages 51 , 52 , 53 and 54 enables the movable portion 37 to be displaced in a substantially linear, preferably rectilinear, manner while keeping the actuator 30 compact.

[0084] Preferably, the actuator 30 includes an even number of translation stages because the vertical deviations of the hooks 39 generated by each translation stage can be compensated for each other when two translation stages are arranged end to end. In this way, the hooks 39 remain at substantially the same height when moving.

[0085] The movable part 37 extends from the fourth section 59. The movable part 37 is preferably rigid. In this example, the movable part 37 has an elbow shape, which is formed by a first section 66 arranged perpendicular to the fourth section 59 and a second section 67 forming a right angle with the first section 66.

[0086] The hook 39 of the actuator 30 is located at the end of the second section 67. At the free end of the first section 66, the protrusion 68 serves as a support for moving the movable part 37.

[0087] By pressing the protrusion 68 with more or less force, due to the deformation of the translation stages 51, 52, 53, 54 of the spring part 35, the movable part 37 moves more or less closer to the stationary part 33.

[0088] In this way, the hook 39 pulls the rod 14 with more or less force in order to actuate the adjusting device for adjusting the stiffness of the flexible element 5.

[0089] The displacement direction of the movable part 39 of the actuator 30 and the rod 14 is substantially orthogonal to the direction of the rod 14.

[0090] In addition, the rod 14 is preferably movable in the hook 39 so that when the rod 14 undergoes an angular displacement, the rod 14 can slide. For this purpose, the rod 14 includes a free end 15 that cooperates with the hook 39.

[0091] For example, in order to be able to adjust the yaw of the speed regulating mechanism 1, the outer stud holder 31 must be able to rotate. Therefore, the hairspring 25 rotates together with the outer stud holder 31, and the free end 15 of the rod 14 slides in the hook 39.

[0092] With this actuation system 20, the yaw can be adjusted without changing the position of the actuator 30 (especially the position relative to the movement mainplate). Regardless of the position of the rod 14 relative to the actuator 30, the mechanical connection between the actuator 30 and the rod 14 is maintained.

[0093] Therefore, this actuation system 20 enables the travel time difference and the yaw to be adjusted independently of each other while maintaining a constant predetermined position of the actuator in the movement, such as the position relative to the mainplate and the balance cock 22.

[0094] The actuation system 20 further includes an adjustment device that cooperates with the actuator 30 so as to be able to shift the movable part 37 of the actuator 30 between a plurality of positions.

[0095] As Figures 7 to 10 shown, the adjusting device includes a pivoting control lever 45 which is arranged to displace the movable part 37 of the actuator 30. The control lever 45 is preferably arranged in a plane substantially perpendicular to the plane of the projection 68 of the movable part 37 and is in contact with the projection 68.

[0096] The control lever 45 has a pivoting arm 69 and a support arm 71 which are connected to the hub 72 of the pivoting control lever 45.

[0097] The support arm 71 cooperates with the movable part 37 of the actuator 30 so as to mechanically displace the movable part 37 by contact. The support arm 71 pushes the projection 68 of the movable part 37 to move it to a greater or lesser extent. Thus, the hook 39 pulls the rod 14 of the hairspring 25 to a greater or lesser extent. The control lever 45 is configured to pivot in a plane substantially perpendicular to the plane of the actuator 30.

[0098] The control lever 45 is configured to be mounted on the mainplate of the movement via the hub 72 which is capable of rotating about a screw 73 mounted on the mainplate.

[0099] Thus, by rotating the control lever 45 about the screw 73, the movable part 37 moves towards or away from the stationary part 33 as the spring part 35 of the actuator 30 is deformed to a greater or lesser extent, thereby changing the position of the rod 14.

[0100] The adjusting device further includes a control screw 70 which is mechanically connected to the pivoting arm 69 so as to control the pivoting of the control lever 45. The axis of the control screw 70 is arranged in the plane of the control lever 45 in the direction of the pivoting arm 69.

[0101] Thus, by tightening or loosening the control screw 70, the control lever 45 and the actuator 30 are actuated so as to move the hook 39 and thus move the rod 14 of the prestressing device 6.

[0102] The restoring force of the spring part 35 of the actuator 30 pushes the control lever 45 against the control screw 70. In this way, the pivoting arm 69 of the control lever 45 is held against the control screw 70.

[0103] In Figure 9 the control screw 70, the control lever 45, the movable part 37 of the actuator 30 and the rod 15 are all in a first position in which the hook 39 slightly pulls the rod 15. The dashed lines show the control lever 45, the movable part 37 of the actuator 30 and the rod 15 in a second position corresponding to Figure 10 ...

[0104] In Figure 10In this case, the control screw 70, the control lever 45, the movable part 37 of the actuator 30, and the rod 15 are all in the second position, in which the pulling force of the hook part 39 on the rod 15 is greater than that Figure 9 in

[0105] In the second position, the control screw 70 pushes the pivot arm 69 of the control lever 45, so that the support arm 71 in contact with the protrusion 68 then pushes the movable part 37 of the actuator 30 towards the stationary part 33 through the deformation of the spring part 35. In this way, the hook part 39 pulls the rod 14, and the rod 14 undergoes a centrifugal displacement.

[0106] In this deformed configuration of the spring part 35, the flexible blades of the first translation stage 51 and the third translation stage 53 are deformed in the same first direction, while the flexible blades of the second translation stage 52 and the fourth translation stage 54 are deformed in the same second direction, and the second direction is opposite to the first direction.

[0107] A spring 74 is arranged around the screw 73 to press the actuator 30 against the balance staff plate 22 to prevent the actuator 30 from falling off.

[0108] The spring 74 clamps the screw 73. The spring 74 is U-shaped and surrounds the screw 73. In this example, one leg of the U-shape extends from the stationary part 33 of the actuator 30 to which it is attached.

[0109] It goes without saying that the present utility model is not limited to the embodiments of the speed control mechanism described with reference to the accompanying drawings, and alternative solutions can be considered without departing from the scope of the present utility model.

Claims

1. An actuation system (20) for a watch movement, the actuation system (20) being configured to enable a component to be at least partially displaced between a plurality of positions, the actuation system (20) comprising a micromechanical actuator (30) intended to engage with the component, the actuator (30) comprising a stationary part (33) intended to be mounted so as to remain stationary relative to a plate of the watch movement, and a movable part (37) capable of moving relative to the stationary part (33), the actuator (30) comprising a spring part (35) connecting the movable part (37) to the stationary part (33), the spring part (35) carrying the movable part (37), the actuation system further comprising a setting device cooperating with the actuator (30) so as to enable the movable part (37) of the actuator (30) to be displaced between a plurality of positions, characterized in that The spring portion (35) comprises a guide having flexible blades.

2. The actuation system (20) for a timepiece movement according to claim 1, characterized in that: The guide with flexible blades comprises at least two translation stages arranged in series, wherein a first translation stage (51) is connected to the stationary part (33) and a last translation stage (54) is connected to the movable part (37).

3. The actuation system (20) for a timepiece movement according to claim 2, characterized in that: Each translation stage includes a pair of parallel flexible blades and a rigid section on which the pair of flexible blades are mounted.

4. An actuation system (20) for a watch movement according to claim 2 or 3, characterized in that: Two consecutive translation stages are arranged end to end relative to each other.

5. An actuation system (20) for a watch movement according to claim 2 or 3, characterized in that: The actuation system includes an even number of translation stages.

6. The actuation system (20) for a timepiece movement according to claim 3, characterized in that: The rigid section is lengthened so that the next translation stage can be associated with the rigid section.

7. An actuation system (20) for a timepiece movement according to any one of claims 1 to 3, characterized in that: At least the spring portion (35) is defined in one plane and is thus flat.

8. An actuation system (20) for a timepiece movement according to claim 2 or 3, characterized in that: At least a second translation stage (52) is arranged on a first side of the first translation stage (51), the first side facing away from the movable part (37).

9. An actuation system (20) for a timepiece movement according to claim 8, characterized in that: At least the last translation stage (54) is arranged on a second side of the first translation stage (51), the second side facing the movable part (37).

10. An actuation system (20) for a timepiece movement according to claim 9, characterized in that: The rigid section of the translation stage arranged on the first side and farthest from the first translation stage (51) extends to the last translation stage (54) arranged on the second side to form the outer peripheral side of the spring portion (35).

11. The actuation system (20) for a timepiece movement according to claim 3, characterized in that: The rigid section of each translation stage extends beyond the pair of flexible blades of the translation stage.

12. An actuation system (20) for a timepiece movement according to claim 2 or 3, characterized in that: The spring portion (35) is arranged below the stationary portion (33).

13. An actuation system (20) for a timepiece movement according to claim 2 or 3, characterized in that: When the actuator (30) is in the rest position, the flexible leaves of the translation stage of the spring portion (35) are parallel.

14. An actuation system (20) for a timepiece movement according to any one of claims 1 to 3, characterized in that: The movable portion (37) includes a hook portion (39).

15. An actuation system (20) for a timepiece movement according to any one of claims 1 to 3, characterized in that: The actuator (30) is made in one piece, wherein the actuator (30) is obtained using a LIGA process or a DRIE process.

16. A watch movement, characterized in that: The timepiece movement comprises an actuation system (20) for a timepiece movement according to any one of the preceding claims.

17. A timepiece, characterized in that: The timepiece comprises a timepiece movement according to claim 16 .

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