Micromechanical actuation system with flexible guide for tumeworking

Abstract

The invention relates to an actuation system (20) for a timepiece movement, the actuation system (20) being configured to be able to at least partially displace a component between a plurality of positions, the actuation system (20) comprising a micromechanical actuator (30) intended to engage with said component, the actuator (30) comprising a stationary portion (33) intended to be mounted such as to remain stationary relative to a board of the timepiece movement, the invention relates to an actuation system comprising a stationary part (33), and a movable part (37) movable 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 setting means cooperating with the actuator (30), the spring portion (35) is arranged 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.

Description

Technical Field

[0001] The invention relates to the field of mechanical watch manufacturing.

[0002] The invention relates more particularly to a micromechanical actuation system with flexible guides for use in watchmaking. Background Art

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

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

[0005] Such an actuation system comprises in particular an actuator, which may be a gear wheel or a setting element, engaging with the component to be actuated.

[0006] These actuators often need to be accurate enough to be used in certain applications where the displacement of the actuator must be controlled very precisely.

[0007] Furthermore, play between the various components of the actuator should be avoided in order to obtain the required precision and prevent hysteresis. More specifically, some actuation systems include a plurality of components connected by contacts.

[0008] Some actuators include a stationary part assembled on a support, such as a pivot mounted on a base plate, and a part movable relative to the stationary part, such as a rod pivoting about the pivot. In order to move the movable part while avoiding play between the parts, a return force is applied to the movable part by a spring to keep the movable part in place or to push the movable part. In the case of a rod, the spring holds the rod in a reference position.

[0009] In order to move the rod, the support pushes the rod from the reference position to the module actuation position. When the support is retracted, the rod returns to its initial position under the action of the spring.

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

[0011] The object of the present invention is to overcome some or all of the above-mentioned drawbacks by providing a high-precision actuation system for a timepiece movement.

[0012] To this end, the invention relates to an actuation system for a timepiece movement, the actuation system being configured to enable a component to be at least partially displaced between a plurality of positions, the actuation system comprising a micromechanical actuator intended to engage the component, the micromechanical actuator comprising a stationary part intended to be mounted so as to remain stationary, for example relative to a plate of the timepiece movement, and a movable part capable of moving relative to the stationary part, the actuator comprising a spring part connecting the movable part to the stationary part, the spring part carrying the movable part, the actuation system also comprising a setting device cooperating with the actuator so as to enable the movable part of the actuator to be displaced between a plurality of positions.

[0013] The invention is characterized in that the spring portion comprises a guide having flexible blades.

[0014] Thus, the present invention provides an actuation system having a high precision actuator, since the actuator can occupy a large number of closely spaced positions. Furthermore, the spring portion of the actuation system avoids problems associated with play.

[0015] According to a particular embodiment of the invention, said guide with flexible blades comprises at least two translation stages / stages arranged in series, wherein a first translation stage is connected to said stationary part and a last translation stage is connected to said movable part.

[0016] According to a particular embodiment of the invention, each translation stage comprises a pair of substantially parallel flexible blades and a rigid section on which the pair of flexible blades are mounted.

[0017] According to a particular embodiment of the invention, two consecutive translation stages are arranged end to end with respect to each other.

[0018] According to a particular embodiment of the invention, the actuation system comprises an even number of translation stages.

[0019] According to a particular embodiment of the invention, said rigid section is elongated so that a next translation stage can be associated with said rigid section.

[0020] According to a particular embodiment of the invention, at least the spring portion is substantially defined in one plane and is thus substantially flat. Preferably, the same is true for the movable portion or even the stationary portion.

[0021] According to a particular embodiment of the invention, at least a second translation stage is arranged on a first side of said first translation stage, said first side facing away from said movable part with respect to said first translation stage.

[0022] According to a particular embodiment of the invention, at least said last translation stage is arranged on a second side of said first translation stage, said second side facing said movable part.

[0023] According to a particular embodiment of the 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 an outer peripheral side of the spring portion.

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

[0025] According to a particular embodiment of the invention, said spring portion is arranged below said stationary portion.

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

[0027] According to a particular embodiment of the invention, said movable portion comprises a hook.

[0028] According to a particular embodiment of the invention, the actuator is made in one piece, wherein the actuator is obtained, for example, using a process of the LIGA type or of the DRIE type.

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

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

[0031] The invention also relates to a timepiece, such as a wristwatch, comprising such a timepiece movement. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0033] - Figure 1 A perspective view schematically shows a regulating organ according to one embodiment of the invention, which regulating organ is arranged in a timepiece movement and includes an actuation system;

[0034] - Figure 2 The schematic diagram shows Figure 1 A perspective view of a portion of the regulating organ shown in , without the pendulum cock;

[0035] - Figure 3 The schematic diagram shows Figure 1 A top view of a portion of the regulating organ shown in , without the pendulum cock and the bearings;

[0036] - Figure 4 The schematic diagram shows Figure 1 A top view of the hairspring of the regulating mechanism shown in FIG.

[0037] - Figure 5 The schematic diagram shows Figure 1 A side view of an actuator of an actuation system of a speed regulating mechanism in FIG.

[0038] - Figure 6 The diagram shows the mounting of the Figure 5 A side view of an actuator of an actuation system in FIG.

[0039] - Figure 7 An enlarged perspective view schematically showing an actuator and an offset lever of an actuation system of a speed regulating mechanism;

[0040] - Figure 8 The schematic diagram shows Figure 1 A bottom view of the speed regulating mechanism in FIG.

[0041] - Fig. 9 an enlarged perspective view schematically showing an actuator and a biasing rod of an actuation system of a speed regulating mechanism in a first position; and

[0042] - Fig.10 An enlarged perspective view of an actuator and a biasing rod of an actuation system of a speed regulating mechanism is schematically shown in a second position. DETAILED DESCRIPTION

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

[0044] Figures 1 to 3 An embodiment of a regulating organ 1 to be arranged in a timepiece movement is schematically shown, the timepiece movement comprising a plate (not shown) provided with a recess. For example, such a movement is arranged in a timepiece such as a watch.

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

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

[0047] like Figure 3 and 4 As shown, the balance spring 25 preferably extends substantially in one plane. The balance spring 25 comprises a flexible strip 2 wound several times around itself, the strip 2 having a predetermined rigidity. The inner end 9 of the strip 2 is integral or assembled with a rigid support 3, which is usually called a collet. The rigid support 3 is substantially triangular and is assembled around the balance staff 24.

[0048] Balance spring 25 also comprises adjustment means for adjusting its stiffness. This adjustment means can be actuated in particular by the user, for example when the regulating organ is mounted in a plate of a timepiece movement.

[0049] The adjustment means comprise a flexible element 5 arranged in series with the strip 2, i.e. immediately after it, preferably as an extension of it, connecting the outer end 4 of said 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 rigidity 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 adjustment device is integral with the strip 2, or even made of the same material, such as silicone.

[0051] Flexible element 5 of balance spring 25 comprises a first flexible blade 19 and a movable semi-rigid portion 18 extending from the outer end of strap 2 and connected to first flexible blade 19, preferably on the same side as rigid portion 18. First flexible blade 19 is also connected to rigid support 17.

[0052] Rigid support 17 is L-shaped, with a first leg 46 of the L serving as connection to first flexible blade 19 and a second leg 47 of the L facing away from first flexible blade 19 so that it can be assembled to a timepiece movement.

[0053] The adjustment device for adjusting the balance spring 25 also comprises a prestressing device 6 for applying a variable force or torque to the flexible element 5. In this way, the stiffness of the balance spring can be adjusted. Thanks to the prestressing device 6, the torque or force can be adjusted continuously. In other words, the torque or force is not limited to an isolated value. Therefore, the stiffness of the flexible element 5 can be adjusted very accurately.

[0054] The prestressing means 6 comprise a second flexible blade 21 which is arranged on the opposite side of the rigid portion 18 and in the extension of the first flexible blade 19 .

[0055] The other end of the second flexible blade 21 is connected to a curved rod 14 extending 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 is partially deformed.

[0056] The force or torque is exerted on the free end 15 of the rod 14 . In this way, the rod 14 of the prestressing device 6 transmits the force or torque to the flexible element 5 via the second flexible blade 21 and the semi-rigid structure 27 , so as to modify the stiffness of the balance spring 25 .

[0057] In order to be able to apply a variable force or torque to balance spring 25 , the regulating organ comprises a specific actuation system 20 according to the invention.

[0058] The actuation system 20 is configured to enable at least partial displacement of a component between a plurality of positions. In the present embodiment, the component is the rod 14 of the prestressing device 6 .

[0059] exist Figures 1 to 3 In the embodiment shown, regulating organ 1 comprises a stud holder 31 provided with a suspended stud 34. Stud holder 31 is mechanically connected to flexible element 5, but does not block strap 2. Stud holder 31 surrounds second bearing 28. To this end, stud holder 31 comprises a central ring 38 arranged around second bearing 28 and resting on balance cock 22.

[0060] The stud 34 cooperates with the second leg 47 of the rigid support 17. In this way, the prestressing means 6 and the flexible element 5 are supported by the stud holder 31 from which they are suspended.

[0061] Furthermore, stud 34 is rigidly attached to rigid support 17. In other words, stud 34 is integral with rigid support 17. Stud 34 and balance spring 25 are assembled, for example, by gluing, soldering, welding, deformation of metallic glass or mechanical fastening.

[0062] Stud 34 is movable relative to balance cock. To this end, stud holder 31 is rotatable relative to balance cock 22 about second bearing 28. Stud holder 34 is displaceable over an angular range of 20° or even 10°, for example.

[0063] By displacing the stud 34 relative to the balance cock 22 , the deflection of the speed regulating mechanism 1 can be adjusted.

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

[0065] In other words, at least a portion of actuator 30 moves substantially along a straight line, unlike stud holder 31 which rotates, for example by turning about an axis. In this way, at least a portion of actuator 30 moves towards or away from balance spring 25 in a direction substantially oriented towards the balance spring.

[0066] Preferably, the direction of displacement of actuator 30 is substantially radial relative to balance wheel 23 and balance spring 25. In this way, the straight line along which actuator 30 moves is directed towards the center of balance wheel 23 and balance spring 25. This also makes the setting of the travel time independent of the setting of the runout.

[0067] The actuator 30 is eccentric with respect to the regulating mechanism, i.e. it is mounted at a distance from the center of the regulating mechanism 1 and is connected only to the rod 14 of the regulating device. The actuator 30 is therefore not mounted directly on the regulating mechanism 1, for example on a bearing 28 of the regulating mechanism 1 like a stud holder.

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

[0069] exist Figure 5 and 6 , the actuator 30 comprises in particular a stationary part 33 intended to be mounted, for example, stationary relative to the plate of a timepiece movement, a movable part 37 movable relative to the swing cock 22 and connected to the lever 14, and a spring part 35 connecting the movable part 37 to the stationary part 33. In this case, the stationary part 33 is mounted on the swing cock 22 and is therefore stationary relative to the swing 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. Therefore, the actuator 30 is flat overall and extends substantially in one plane. The actuator 30 is preferably made in one piece, wherein the actuator 30 can be obtained, for example, by a LIGA type photolithography process or by a DRIE type deep reactive ion etching process.

[0070] In order to actuate said rod 14, the actuator 30 comprises a hook 39 engaging with the rod 14, the hook 39 being mounted on the movable part 37. The hook 39 at least partially surrounds the rod 14, but can also be closed around it.

[0071] The radial displacement of the movable part 37 of the actuator 30 pulls or pushes the rod 14 radially relative to the balance spring 25. This changes the stiffness of the flexible element 5, since the displacement of the rod 14 exerts a greater or lesser force or torque on the flexible element 5, causing a change in the stiffness of the flexible element 5 and therefore of the balance spring 25 as a whole. Thus, the actuation system 20 allows the regulation of the rate difference of the regulating organ 1.

[0072] Here, stationary part 33 has a substantially square shape and is provided with at least one attachment recess 41, preferably two attachment recesses 41, 42, each intended to receive a stud 43, 44 extending from balance cock 22. Attachment recesses 41, 42 are arranged, for example, on diagonally opposite sides of stationary part 33.

[0073] Each recess 41, 42 is provided with a flexible tongue 48, 49 arranged in the recess 41, 42. The first recess 41 is open at the side so that it can slide laterally around the first column 43. The second recess 42 is closed and can receive the second column 44 by inserting it into the second recess 42. When the column 43, 44 enters the recess 41, 42, the flexible tongues 48, 49 are deformed and serve as supporting means to keep the column 43, 44 in the recess 41, 42. In addition, the flexible tongues 48, 49 make it possible to improve the positioning accuracy by overcoming the play when the column 43, 44 is positioned in the recess 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 machine plate and the balance cock 22. Therefore, 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 comprises an even number of translation stages, because two translation stages arranged end to end allow the vertical deviations of the hook 39 produced by each translation stage to compensate each other. In this way, the hook 39 is kept at substantially the same height during movement.

[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, a projection 68 serves as a bearing against which the movable part 37 can be moved.

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

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

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

[0090] Furthermore, the rod 14 is preferably movable in the hook 39 so that the rod 14 can slide when the rod 14 is angularly displaced. To this end, the rod 14 comprises a free end 15 cooperating with the hook 39.

[0091] For example, in order to be able to adjust the runout of regulating organ 1 , stud holder 31 must be able to rotate. Balance spring 25 thus rotates together with stud holder 31 , and free end 15 of stem 14 slides in hook 39 .

[0092] With this actuation system 20, the yaw can be adjusted without changing the position of the actuator 30, in particular relative to the movement plate. The mechanical link between the actuator 30 and the rod 14 is maintained whatever the position of the rod 14 relative to the actuator 30.

[0093] Such an actuation system 20 thus enables the rate difference and the runout to be adjusted independently of one another while maintaining a constant predetermined position of the actuator in the movement, for example relative to the plate and balance-cock 22 .

[0094] The actuation system 20 also comprises adjustment means cooperating with the actuator 30 so as to be able to displace the movable portion 37 of the actuator 30 between a plurality of positions.

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

[0096] The control lever 45 has a pivot arm 69 and a support arm 71 which is connected to a hub 72 which pivots the 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 a greater or lesser extent to move it. Thus, the hook 39 pulls the rod 14 of the balance spring 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] Control lever 45 is configured to be mounted on the plate of the movement via a hub 72 rotatable about a screw 73 mounted on the plate.

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

[0100] The adjustment device also comprises a control screw 70 which is mechanically connected to the pivot arm 69 in order 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 pivot arm 69.

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

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

[0103] exist Fig. 9 In the embodiment, the control screw 70, the control rod 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 that the control rod 45, the movable part 37 of the actuator 30 and the rod 15 are in the same position as the first position. Fig.10 The corresponding second position.

[0104] exist Fig.10 In the embodiment, the control screw 70, the control rod 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 39 on the rod 15 is greater than Fig. 9 Medium is bigger.

[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 in turn pushes the movable part 37 of the actuator 30 towards the stationary part 33 by deformation of the spring part 35. In this way, the hook 39 pulls the rod 14, which is displaced eccentrically.

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

[0107] A spring 74 is arranged around the screw 73 for pressing the actuator 30 against the swing bridge 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 invention is not limited to the embodiments of the speed regulating mechanism described with reference to the drawings and that alternatives may be considered without departing from the scope of the invention.

Claims

1. An actuation system 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 micromechanical actuator (30) comprising a stationary part (33) intended to be mounted so as to remain stationary, for example 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 according to claim 1, characterized in that: The guide with flexible blades comprises at least two translation stages (51, 52, 53, 54) 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 according to claim 2, characterized in that: 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.

4. The actuation system according to claim 2 or 3, characterized in that: Two consecutive translation stages (51, 52, 53, 54) are arranged end to end relative to each other.

5. The actuation system according to any one of claims 2 to 4, characterized in that: The actuation system includes an even number of translation stages (51, 52, 53, 54).

6. The actuation system according to any one of claims 2 to 5, characterized in that: The rigid section (56, 57, 58, 59) is lengthened so that the next translation stage (51, 52, 53, 54) can be associated with the rigid section.

7. An actuation system according to any one of claims 2 to 6, characterized in that: At least the spring portion (35) is substantially defined in one plane and is thus substantially flat, and preferably so is the movable portion (37) or even the stationary portion (33).

8. An actuation system according to any one of claims 2 to 7, 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 according to any one of claims 2 to 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 according to any one of claims 2 to 9, characterized in that: The rigid section (55) of the translation stage (53) arranged on the first side and farthest from the first translation stage (51) extends to the translation stage (54) arranged on the second side to form an outer peripheral side of the spring portion (35).

11. An actuation system according to any one of claims 2 to 10, characterized in that: Each rigid section (56, 57, 58, 59) of the translation stage (51, 52, 53, 54) extends beyond the pair of flexible blades of the translation stage (51, 52, 53, 54).

12. An actuation system according to any one of claims 2 to 11, characterized in that The spring portion (35) is arranged below the stationary portion (33).

13. An actuation system according to any one of claims 2 to 12, characterized in that: When the actuator (30) is in the rest position, the flexible leaves of the translation stage (51, 52, 53, 54) of the spring portion (35) are substantially parallel.

14. An actuation system according to any one of claims 2 to 13, characterized in that The movable portion (37) includes a hook portion (39).

15. Actuation system according to any one of the preceding claims, characterized in that The actuator (30) is made in one piece, wherein the actuator (30) is obtained, for example, using a LIGA process or a DRIE process.

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

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

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