CH720978A2 - Flexible-guided micromechanical actuation system for watchmaking - Google Patents

Abstract

The invention relates to an actuation system for a watch movement, the actuation system being configured to be able to at least partially move a part according to a plurality of positions, the actuation system comprising a micromechanical actuator (30) intended to be engaged with said part, the micromechanical actuator (30) comprising a part (33) intended to be fixedly mounted, for example relative to a watch movement plate, and a movable part (37) relative to the fixed part (33), the actuator (30) comprising a spring part (35) connecting the movable part (37) to the fixed part (33), the spring part (35) carrying the movable part (37), the actuation system further comprising adjustment means cooperating with the actuator (30) so as to be able to move the movable part (37) of the actuator (30) according to a plurality of positions, the spring part (35) comprising a flexible blade guide.

Description

Technical field of the invention

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

[0002] The invention relates more specifically to a micromechanical actuation system with flexible guidance for watchmaking.

Technological background

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

[0004] For example, in the field of watchmaking, to trigger or actuate a particular watch module of a movement, we know, for example, pushers, levers or rockers, arranged in the mechanical movement, and which make it possible to transmit a movement or a force between two parts of the movement.

[0005] Such an actuation system notably comprises an actuator engaged with the part to be actuated, which may be a gear wheel or an adjustment element.

[0006] These actuators generally need to be quite precise for certain applications, where the actuator displacement must be controllable with great finesse.

[0007] In addition, it is desired to avoid having play between the parts of the actuator in order to obtain the desired precision, and to avoid hysteresis phenomena. Indeed, certain actuation systems comprise several parts connected by contact.

[0008] Some actuators comprise a fixed part assembled on a support, for example a pivot mounted on the plate, and a part movable relative to the fixed part, for example a rocker pivoting about the pivot. To move the movable part while avoiding play between the parts, a spring exerts a restoring force on the movable part, either to retain it or to push it. In the case of a rocker, the spring retains the rocker in a reference position.

[0009] To move the rocker, a support piece pushes the rocker to move it from a reference position to an actuation position of the module. When the support piece is withdrawn, the rocker returns to its initial position under the effect of the spring.

[0010] However, for certain functions, these actuation systems are not precise and sensitive enough, in particular for adjustment devices, which require a plurality of precise positions of the actuator.

Summary of the invention

[0011] The aim of the present invention is to overcome all or part of the drawbacks mentioned above by proposing an actuation system for a highly precise clock movement.

[0012] For this purpose, the invention relates to an actuation system for a watch movement, the actuation system being configured to be able to at least partially move a part according to a plurality of positions, the actuation system comprising a micromechanical actuator intended to be engaged with said part, the micromechanical actuator comprising a part intended to be fixedly mounted, for example relative to a watch movement plate, and a part movable relative to the fixed part, the actuator comprising a spring part connecting the movable part to the fixed part, the spring part carrying the movable part, the actuation system further comprises adjustment means cooperating with the actuator so as to be able to move the movable part of the actuator according to a plurality of positions.

[0013] The invention is remarkable in that the spring part comprises a flexible blade guide.

[0014] Thanks to the invention, an actuation system is obtained with a highly precise actuator, since it can take a large number of very close positions. Furthermore, the actuation system avoids play problems thanks to its spring part.

[0015] According to a particular embodiment of the invention, the flexible blade guide comprises at least two translation tables arranged in series, a first translation table is connected to the fixed part, and a last translation table is connected to the mobile part.

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

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

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

[0019] According to a particular embodiment of the invention, the rigid sections are extended to be able to associate the following translation table with them.

[0020] According to a particular embodiment of the invention, at least the spring part is defined substantially in a plane so as to be substantially flat, preferably the movable part also, or even the fixed part.

[0021] According to a particular embodiment of the invention, at least the second translation table is arranged on a first side of the first translation table, which is opposite the movable part relative to the first translation table.

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

[0023] According to a particular embodiment of the invention, the rigid section of the translation table arranged on the first side, which is furthest from the first translation table, extends to a translation table arranged on the second side to form a peripheral side of the spring part.

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

[0025] According to a particular embodiment of the invention, the spring part is arranged under the fixed part.

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

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

[0028] According to a particular embodiment of the invention, the actuator is a single-piece, the actuator being for example obtained by a LIGA or DRIE type process.

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

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

[0031] The invention also relates to a timepiece, for example a watch, comprising such a timepiece movement.

Brief description of the figures

[0032] The aims, advantages and characteristics of the present invention will become apparent upon reading the detailed description of several embodiments given solely as non-limiting examples, with reference to the appended drawings in which: - Figure 1 schematically represents a perspective view of a regulating member comprising an actuation system according to an embodiment of the invention, the regulating member being arranged in a watch movement, - Figure 2 schematically represents a perspective view of a part of the regulating member of Figure 1, without a balance bridge, - Figure 3 schematically represents a top view of a part of the regulating member of Figure 1, without a balance bridge and without a bearing, - Figure 4 schematically represents a top view of a hairspring of the regulating member of Figure 1, - Figure 5 schematically represents a side view of the actuator of the actuation system of the regulating member of figure 1, – figure 6 schematically represents a side view of the actuator of the actuation system of figure 5 mounted on the balance bridge, – figure 7 schematically represents an enlarged perspective view of the actuator and the offset lever of the actuation system of the regulating member, and – figure 8 schematically represents a bottom view of the regulating member of figure 1, – figure 9 schematically represents an enlarged perspective view of the actuator and the offset lever of the actuation system of the regulating member in a first position, and – figure 10 schematically represents an enlarged perspective view of the actuator and the offset lever of the actuation system of the regulating member in a second position.

Detailed description of the invention

[0033] In the following description, the subject matter of the invention, which is an actuation system, is configured to actuate means for adjusting the rate of a timepiece regulating organ. However, such an actuation system may be used for other applications in a timepiece movement, and it is in no way limited to an application in a regulating organ.

[0034] Figures 1 to 3 show a schematic representation of an embodiment of a regulating member 1 intended to be arranged in a timepiece movement comprising a plate (not shown in the figures) provided with a housing. Such a movement is for example arranged in a timepiece, such as a watch.

[0035] The regulating member 1 comprises an inertial mass, here an annular balance wheel 23, a balance spring 25 as an elastic return element of the inertial mass configured to make it oscillate, a balance shaft 24, and a balance bridge 22. The elements are superimposed from bottom to top in the following order: the balance wheel 23, the balance spring 25, and the balance bridge 22.

[0036] The balance shaft 24 passes through the balance center, the hairspring 25, and the balance bridge 22. The balance shaft 24 is held by two shock-absorbing bearings 28 arranged at both ends of the balance shaft 24. A first bearing is arranged below, and the second bearing 28 is arranged above in the balance bridge 22. The balance bridge 22 is provided with a through hole in which the second bearing 28 is held.

[0037] Shown in Figures 3 and 4, the hairspring 25 preferably extends substantially in one plane. The hairspring 25 comprises a flexible ribbon 2 wound on itself in several turns, the ribbon 2 having a predefined stiffness. The internal end 9 of the ribbon 2 is made of material or is assembled to a rigid support 3, generally called a collet. The rigid support 3 has a substantially triangular shape, and is threaded around the balance shaft 24.

[0038] The spiral spring 25 further comprises means for adjusting its stiffness. For example, the adjustment means are in particular operable by a user when the regulating member is mounted in the plate of the watch movement.

[0039] The adjustment means comprise a flexible element 5 arranged in series with the strip 2, that is to say following the strip, preferably in its extension, the flexible element 5 connecting an external end 4 of said strip 2 to a rigid support 17. The flexible element 5 is integral with the external end 4 of the strip 2. The flexible element 5 is an element different from the strip 2.

[0040] The flexible element 5 adds additional stiffness following that of the strip 2. The flexible element 5 preferably has a stiffness greater than that of the strip 2. The flexible element 5 is here arranged in the extension of the strip 2. Preferably, the adjustment means and the strip 2 are in one piece, or even formed from the same material, for example silicon.

[0041] The flexible element 5 of the spiral spring 25 comprises a first flexible blade 19 and a movable semi-rigid part 18, which extends from the external end of the ribbon 2, and is connected to the first flexible blade 19, preferably on the same side of the rigid part 18. The first flexible blade 19 is connected on the other hand to the rigid support 17.

[0042] The rigid support 17 has an L shape, a first branch 46 of the L serving as a connection with the first flexible blade 19, the second branch 47 of the L being oriented on the side opposite the first flexible blade 19 so that it can be assembled to the clock movement.

[0043] The spring-balance adjustment means 25 further comprise pre-stressing means 6 for applying a variable force or torque to the flexible element 5. Thus, the stiffness of the spring-balance can be adjusted. The torque or force is continuously adjustable by the pre-stressing means 6. In other words, the torque or force is not restricted to point values. Thus, the stiffness of the flexible element 5 can be adjusted with great precision.

[0044] The prestressing means 6 comprise a secondary flexible blade 21, arranged on an opposite side of the rigid part 18 in the extension of the first flexible blade 19.

[0045] The secondary flexible blade 21 is connected by the other end to a curved lever 14 going around the strip 2. The lever 14 is connected, in addition to the secondary flexible blade 21, to a semi-rigid structure 27 linked to the rigid support 17. The semi-rigid structure 27 deforms in part when the lever 14 is actuated by force or torque.

[0046] The force or torque is exerted on the free end 15 of the lever 14. Thus, the lever 14 of the prestressing means 6 transmits the force or torque to the flexible element 5 via the secondary flexible blade 21 and the semi-rigid structure 27, so as to modify the stiffness of the spiral spring 25.

[0047] In order to be able to apply the variable force or torque to the spiral spring 25, the regulating member comprises a particular actuation system 20 according to the invention.

[0048] The actuation system 20 is configured to be able to at least partially move a part according to a plurality of positions. In this embodiment, the part is the lever 14 of the prestressing means 6.

[0049] In the embodiment of Figures 1 to 3, the regulating member 1 comprises a stud holder 31 provided with a suspended stud 34. The stud holder 31 is mechanically connected to the flexible element 5, but it does not block the ribbon 2. The stud holder 31 surrounds the second bearing 28. For this, the stud holder 31 comprises a central ring 38 arranged around the second bearing 28, and which rests on the balance bridge 22.

[0050] The stud 34 cooperates with the second branch 47 of the rigid support 17. Thus, the prestressing means 6 and the flexible element 5 are supported by the stud holder 31 from which they are suspended.

[0051] Furthermore, the stud 34 is rigidly connected to the rigid support 17. In other words, the stud 34 is integral with the rigid support 17. The assembly of the stud 34 and the spiral spring 25 is for example carried out by gluing, brazing, welding, by deformation of metallic glass, or by mechanical fixing.

[0052] The stud 34 is movable relative to the balance bridge. For this purpose, the stud holder 31 is movable in rotation about the second bearing 28 relative to the balance bridge 22. The stud holder 34 can for example be moved over an angular range of 20°, or even 10°.

[0053] The movement of the stud 34 relative to the balance bridge 22 makes it possible to adjust the reference of the regulating organ 1.

[0054] The actuation system 20 further comprises an actuator 30 configured to actuate the lever 14. The actuator 30 is mechanically connected to the prestressing means 6, the actuator 30 being configured to perform at least part of a movement, preferably substantially linear, or even rectilinear, to actuate the prestressing means 6.

[0055] In other words, at least a portion of the actuator 30 moves substantially along a straight line, unlike, for example, the stud holder 31 which undergoes rotation by turning around an axis. Thus, at least a portion of the actuator 30 moves closer to or further away from the spiral spring 25 in a direction oriented substantially toward the spiral spring.

[0056] Preferably, the direction of movement of the actuator 30 is substantially radial relative to the balance 23 and the balance spring 25. Thus, the straight line along which the actuator 30 moves is directed towards the center of the balance 23 and the balance spring 25. Furthermore, this makes the adjustment of the rate independent of the adjustment of the reference mark.

[0057] The actuator 30 is eccentric relative to the regulating member, that is to say mounted at a distance from the center of the regulating member 1, and is connected only to the lever 14 of the adjustment means. Thus, the actuator 30 is not mounted directly on the regulating member 1, like a stud holder on a bearing 28 of the regulating member 1 for example.

[0058] In this embodiment, the actuator 30 is mounted on the balance bridge 22. Preferably, the actuator 30 is mounted substantially perpendicular to the plane of the balance bridge 22. More precisely, it is assembled on a slice of the balance bridge 22.

[0059] In FIGS. 5 and 6, the actuator 30 comprises in particular a part 33 intended to be fixedly mounted, for example relative to a watch movement plate, a movable part 37 relative to the balance bridge 22 and connected to the lever 14, as well as a spring part 35 joining the movable part 37 to the fixed part 33. The fixed part 33 is mounted here on the balance bridge 22, and is therefore fixed relative to the latter. The fixed part 33 and the movable part 37 are preferably rigid. The fixed 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 a single-piece, the actuator 30 being for example obtained by a LIGA type lithography process, or a DRIE type deep reactive ion etching process.

[0060] To actuate the lever 14, the actuator 30 comprises a hook 39 engaged with the lever 14, the hook 39 being mounted on the movable part 37. The hook 39 at least partly surrounds the lever 14, but it can also be closed around the lever 14.

[0061] A radial movement of the movable part 37 of the actuator 30 pulls or pushes the lever 14 radially relative to the spiral spring 25. Thus, the stiffness of the flexible element 5 is modified, because the movement of the lever 14 exerts a greater or lesser force or torque on the flexible element 5, so that the stiffness of the flexible element 5 varies, and consequently the stiffness of the spiral spring 25 as a whole. The actuation system 20 thus makes it possible to adjust the operation of the regulating member 1.

[0062] The fixed part 33 here has a substantially square shape, and is provided with at least one fixing notch 41, preferably two fixing notches 41, 42, each to receive a stud 43, 44 extending from the balance bridge 22. The fixing notches 41, 42 are for example arranged on two diagonally opposite sides of the fixed part 33.

[0063] Each notch 41, 42 is provided with a flexible tab 48, 49 arranged in the notch 41, 42. The first notch 41 is open on the side to slide it laterally around the first stud 43. The second notch 42 is closed, and can receive the second stud 44 by insertion into the second notch 42. The flexible tabs 48, 49 deform when a stud 43, 44 enters the notch 41, 42, and they serve as a support means to retain the stud 43, 44 in the notch 41, 42. In addition, the flexible tabs 48, 49 make it possible to improve the positioning accuracy by taking up the positioning clearances of the studs 43, 44 in the notches 41, 42, preferably in the same sense.

[0064] As shown in the figures, the actuator 30 is mounted on the balance bridge 22, so as to be substantially perpendicular to the plate and to the balance bridge 22. Thus, it is mounted on the edge of the balance bridge 22.

[0065] The spring portion 35 is arranged under the fixed portion 33, so that it extends below the level of the balance bridge 22.

[0066] According to the invention, the spring part 35 comprises a flexible guide. The flexible guide here comprises several translation tables 51, 52, 53, 54 with flexible blades arranged in series, one after the other. They are defined as being in series, because the movements of each translation table add up at least in part.

[0067] Each translation table 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 is mounted.

[0068] The first translation table 51 is arranged under the fixed part 33 and has a first rigid section 56 extended to associate therewith a second translation table 52 arranged head to tail relative to the first translation table 51. Thus, 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 is offset by half the length of the first rigid section.

[0069] The second rigid section 57 is also extended to associate a third translation table 53 arranged head to tail with respect to the second translation table 52, and therefore substantially parallel to the first translation table 51. The third pair of flexible blades 63 is substantially parallel to the first 61 and to the second pair of flexible blades 62.

[0070] The actuator 30 comprises a fourth translation table 54 arranged on the other side of the first translation table 5 relative to the second 52 and the third translation table 53. The fourth translation table 54 is arranged head-to-tail relative to the third translation table 53.

[0071] Thus, the fourth pair of flexible blades 64 is substantially parallel to the other pairs of flexible blades, and the fourth section 59 is arranged substantially in the same direction as the second section 57.

[0072] The third 53 and the fourth translation table 54 are connected by an arm 55 extending from the third section 58, and passing below the first rigid section 56 of the first translation table 51.

[0073] Such an arrangement of translation tables 51, 52, 53, 54 makes it possible to obtain a movement of the movable part 37, which is substantially linear, preferably rectilinear, while retaining a compact actuator 30.

[0074] Preferably, the actuator 30 comprises an even number of translation tables, since two translation tables arranged head to tail make it possible to mutually compensate for the vertical deviation of the hook 39 generated by each. Thus, the hook 39 remains substantially at the same height when it moves.

[0075] The movable part 37 extends from the fourth section 59. The movable part 37 is preferably rigid. The movable part 37 here has the shape of an elbow formed by a first segment 66 arranged perpendicular to the fourth section 59 and a second segment 67 forming a right angle with the first segment 66.

[0076] The hook 39 of the actuator 30 is arranged at the end of the second segment 67. At the free end of the first segment 66, a bulge 68 serves as a support to be able to move the movable part 37.

[0077] By pressing more or less hard on the bulge 68, the movable part 37 comes closer or less to the fixed part 33, thanks to the deformation of the translation tables 51, 52, 53, 54 of the spring part 35.

[0078] Thus, the hook 39 pulls more or less strongly on the lever 14 to actuate the means for adjusting the stiffness of the flexible element 5.

[0079] The direction of movement of the movable part 39 of the actuator 30 and of the lever 14 is substantially orthogonal to the direction of the lever 14.

[0080] Furthermore, the lever 14 is preferably movable in the hook 39, so as to be able to slide when the lever 14 performs an angular displacement. For this purpose, the lever 14 comprises a free end 15 cooperating with the hook 39.

[0081] For example, in order to be able to adjust the reference mark of the regulating member 1, it is necessary to be able to rotate the stud holder 31. Consequently, the spiral spring 25 rotates with the stud holder 31, and the free end 15 of the lever 14 slides in the hook 39.

[0082] Thanks to such an actuation system 20, the reference mark can be adjusted without having to modify the position of the actuator 30, in particular relative to the plate of the movement. The mechanical connection between the actuator 30 and the lever 14 is maintained regardless of the position of the lever 14 relative to the actuator 30.

[0083] Thus, this actuation system 20 makes it possible to adjust the rate and the reference independently of each other, while having a constant predetermined position of the actuator in the movement, for example relative to the plate and the balance bridge 22.

[0084] The actuation system 20 further comprises adjustment means cooperating with the actuator 30 so as to be able to move the movable part 37 of the actuator 30 according to a plurality of positions.

[0085] As shown in FIGS. 7 to 10, the adjustment means comprise a pivoting control rocker 45 arranged to move the movable part 37 of the actuator 30. The control rocker 45 is preferably arranged in a plane substantially perpendicular to the plane of, and is in contact with the bulge 68 of the movable part 37.

[0086] The control rocker 45 comprises a pivot arm 69 and a support arm 71 connected to a hub 72 of the pivoting control rocker 45.

[0087] The support arm 71 cooperates with the movable part 37 of the actuator 30 to move it mechanically by contact. The support arm 71 pushes back more or less the bulge 68 of the movable part 37 to move it. Thus, the hook 39 pulls more or less the lever 14 of the spiral spring 25. The control rocker 45 is configured to pivot in a plane substantially perpendicular to the plane of the actuator 30.

[0088] The control lever 45 is configured to be mounted on the plate of the movement via the hub 72, which can rotate about a screw body 73, the screw 73 being mounted on the plate.

[0089] Thus, by the rotation of the control rocker 45 around the screw body 73, the movable part 37 moves closer to or away from the fixed part 33 by the more or less pronounced deformation of the spring part 35 of the actuator 30 in order to modify the position of the lever 14.

[0090] The adjustment means further comprise a control screw 70 mechanically connected to the pivot arm 69, in order to control the pivoting of the control rocker 45. The axis of the control screw 70 is arranged in the plane of the control rocker 45 in the direction of the pivot arm 69.

[0091] Thus, by screwing or unscrewing the control screw 70, the control lever 45 and the actuator 30 are actuated to move the hook 39 and therefore the lever 14 of the prestressing means 6.

[0092] The restoring force of the spring portion 35 of the actuator 30 pushes the control rocker 45 against the control screw 70. Thus, the pivot arm 69 of the control rocker 45 is held against the control screw 70.

[0093] In Figure 9, the control screw 70, the control rocker 45, the movable part 37 of the actuator 30, and the lever 15 are each in a first position, in which the hook 39 pulls little on the lever 15. In dotted lines, the control rocker 45, the movable part 37 of the actuator 30, and the lever 15 are shown in a second position corresponding to Figure 10.

[0094] In Figure 10, the control screw 70, the control rocker 45, the movable part 37 of the actuator 30, and the lever 15 are each in a second position, in which the hook 39 pulls the lever 15 more than in Figure 9.

[0095] In the second position, the control screw 70 pushes the pivot arm 69 of the control rocker 45, so that the support arm 71 in contact with the bulge 68, in turn pushes the movable part 37 of the actuator 30 towards the fixed part 33 by deformation of the spring part 35. Thus, the hook 39 pulls on the lever 14, which performs a centrifugal movement.

[0096] In the deformed configuration of the spring portion 35, the flexible blades of the first translation table 51 and of the third translation table 53 deform in the same first direction, while the flexible blades of the second translation table 52 and of the fourth translation table 54 deform in the same second direction, the second direction being opposite to the first direction.

[0097] A spring 74 is arranged around the screw body 73 to press the actuator 30 against the balance bridge 22, so that it does not come loose.

[0098] The spring 74 tightens the screw body 73. The spring 74 has a U shape surrounding the screw body 73. One branch of the U here extends from the fixed part 33 of the actuator 30 to which it is attached.

[0099] Naturally, the invention is not limited to the embodiments of regulating members described with reference to the figures, and variants could be envisaged without departing from the scope of the invention.

Claims (17)

1. Actuation system for a watch movement, the actuation system (20) being configured to be able to at least partially move a part according to a plurality of positions, the actuation system (20) comprising a micromechanical actuator (30) intended to be engaged with said part, the micromechanical actuator (30) comprising a part (33) intended to be fixedly mounted, for example relative to a watch movement plate, and a movable part (37) relative to the fixed part (33), the actuator (30) comprising a spring part (35) connecting the movable part (37) to the fixed part (33), the spring part (35) carrying the movable part (37), the actuation system further comprises adjustment means cooperating with the actuator (30) so as to be able to move the movable part (37) of the actuator (30) according to a plurality of positions, characterized in that the spring part (35) comprises a blade guide flexible. 2. Actuation system according to claim 1, characterized in that the flexible blade guide comprises at least two translation tables (51, 52, 53, 54) arranged in series, a first translation table (51) is connected to the fixed part (33), and a last translation table (54) is connected to the movable part (37). 3. Actuation system according to claim 2, characterized in that each translation table (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) is mounted. 4. Actuation system according to claim 2 or 3, characterized in that two consecutive translation tables (51, 52, 53, 54) are arranged head to tail with respect to each other. 5. Actuation system according to any one of claims 2 to 4, characterized in that it comprises an even number of translation tables (51, 52, 53, 54). 6. Actuation system according to any one of claims 2 to 5, characterized in that the rigid sections (56, 57, 58, 59) are extended to be able to associate the following translation table (51, 52, 53, 54) with them. 7. Actuation system according to any one of claims 2 to 6, characterized in that at least the spring part (35) is defined substantially in a plane so as to be substantially flat, preferably the movable part (37) also, or even also the fixed part (33). 8. Actuation system according to any one of claims 2 to 7, characterized in that at least the second translation table (52) is arranged on a first side of the first translation table (51), which is opposite the movable part (37). 9. Actuation system according to any one of claims 2 to 8, characterized in that at least the last translation table (54) is arranged on a second side of the first translation table (51), which is towards the movable part (37). 10. Actuation system according to any one of claims 2 to 9, characterized in that the rigid section (55) of the translation table (53) arranged on the first side, which is furthest from the first translation table (51), extends to a translation table (54) arranged on the second side to form a peripheral side of the spring part (35). 11. Actuation system according to any one of claims 2 to 10, characterized in that each rigid section (56, 57, 58, 59) of a translation table (51, 52, 53, 54) extends beyond the pair of flexible blades of said translation table (51, 52, 53, 54). 12. Actuation system according to any one of claims 2 to 11, characterized in that the spring part (35) is arranged under the fixed part (33). 13. Actuation system according to any one of claims 2 to 12, characterized in that the flexible blades of the translation tables (51, 52, 53, 54) of the spring part (35) are substantially parallel in the rest position of the actuator (30). 14. Actuation system according to any one of claims 2 to 13, characterized in that the movable part (37) comprises a hook (39). 15. Actuation system according to any one of the preceding claims, characterized in that the actuator (30) is a single-piece, the actuator (30) being for example obtained by a LIGA or DRIE type process. 16. Clock movement, characterized in that it comprises an actuation system (20) according to any one of the preceding claims. 17. Timepiece, for example a watch, characterized in that it comprises a timepiece movement according to claim 16.