Speed regulating mechanism for timepiece movement, timepiece movement and timepiece

Abstract

The utility model relates to a speed regulating mechanism (1) for a clock movement, which comprises an inertial mass body such as a balance wheel (23), a hairspring (25) comprising a strip (2) wound for multiple circles, and an actuating system used for regulating the travel time difference of the speed regulating mechanism (1), the actuating system comprises an actuator (30) mechanically connected to the hairspring (25), the travel time difference of the speed regulating mechanism can be changed by the displacement of the actuator, the actuator (30) comprises a hook (39) engaged with the hairspring (25), and the stiffness of the hairspring (25) can be changed by the displacement of the actuator (30). The utility model also relates to a clock movement comprising the speed regulating mechanism and a clock comprising the clock movement.

Description

Technical Field

[0001] The present utility model relates to the field of watchmaking, and more particularly to the field of mechanical watchmaking, in which the regulation of the driving energy is provided by a speed regulation mechanism.

[0002] More specifically, the present utility model relates to a speed regulation mechanism provided with an actuation system, a watch movement including such a speed regulation mechanism, and a watch including such a watch movement. Background Art

[0003] In most mechanical watches, the energy required to rotate the hands (such as the minute hand and the hour hand) is stored in a barrel and then transmitted by a balance spring system, which includes a flywheel called a balance wheel that is combined with a spring called a balance spring, which is in the form of a helically wound strip.

[0004] The inner end of the balance spring is attached to a balance staff that rotates integrally with the balance wheel; the outer end of the balance spring is attached to an outer stud, which is mounted on an outer stud holder, and the outer stud holder itself is rigidly connected to a fixed bridge plate.

[0005] The rotation of the balance wheel is maintained by an escapement mechanism, and its oscillations are counted by the escapement mechanism, which includes an escapement lever that exhibits a low-amplitude oscillatory motion and is provided with two escapement pallets that engage with the teeth of an escape wheel. When the escape wheel is engaged in this way, it causes a stepwise rotation, the rotation frequency of which is determined by the oscillation frequency of the escapement lever, and the oscillation frequency of the escapement lever itself is set to the oscillation frequency of the balance spring system.

[0006] In a traditional escapement mechanism, the oscillation frequency is approximately 4 Hz, or approximately 28,800 vibrations per hour (V / h). One of the goals of an excellent watchmaker is to ensure the isochronism and regularity of the balance wheel oscillations (or the constancy of the rate).

[0007] The rate of the balance wheel can be adjusted in a known manner by adjusting the effective length of the balance spring, which is defined as the curved length between the inner end of the balance spring and the counting point, which is located near the outer end of the balance spring and is usually defined by a pair of stops carried by a key mounted on a regulator system.

[0008] During operation, the regulator system cannot rotate about the axis of the balance spring. However, its angular position can be finely adjusted by manual intervention, for example, using a screwdriver to pivot an eccentric that acts on the regulator system like a cam.

[0009] The assembly including the bridge plate, the regulator system, the key, the outer stud holder, the outer stud, the balance staff, the balance spring, and the balance wheel is usually referred to as a "speed regulation mechanism". An example of a speed regulation mechanism is given in European Patent EP 2876504 filed by watchmaker ETA.

[0010] Some hairspring systems have such an outer stud retainer: that is, one end of the hairspring is attached to the outer stud retainer, and there is play in the key of the hairspring system to allow the hairspring to move between two stops. However, the timing characteristics, especially the non-isochronism according to the change in amplitude, are very sensitive to the play of the hairspring at the hairspring key, and it is very difficult to precisely control such play.

[0011] In some devices, the stops can be adjusted to clamp the hairspring, thereby eliminating the play, especially when the hairspring is working. In this case, the rate error is first adjusted by moving the hairspring key, and then the hairspring is clamped to the key. However, clamping the hairspring to the hairspring key may stress the hairspring and cause a timing error, especially due to the coiled hairspring being off-center. In addition, eliminating the play also changes the rate error, and once the hairspring has been clamped, it is no longer possible to move the hairspring key along the hairspring to complete the fine adjustment of the rate error.

[0012] Other hairsprings have integrated speed control devices. In these hairsprings, the rate error is not adjusted by changing the effective length of the hairspring, but by applying a force or torque to a flexible element arranged in series with the hairspring. In this way, the stiffness of the flexible element can be changed, thereby changing the overall stiffness of the hairspring, that is, the stiffness of the strip and the flexible element. The rate error of the speed control mechanism can be adjusted by adjusting the stiffness of the hairspring. For example, such hairsprings provided with flexible elements are described in patent applications EP4009115 and CH0700385 / 2021.

[0013] In these cases, conventional systems cannot be used because they are not compatible with the hairspring speed control device. In addition, since the rate error must be adjusted to a very fine degree, there must be no play between the hairspring and the area where it interacts with the hairspring regulating mechanism. More specifically, if this is not the case, the rate error may be changed in the event of an impact if the hairspring does not reposition itself in exactly the same way.

[0014] To use such a hairspring, a hairspring system is described in patent applications EP22177059.7 and CH000678 / 2022. The hairspring system includes an outer stud retainer divided into two relatively movable parts, each part being provided with an outer stud. On the one hand, the flexible element is mounted on the outer stud, and on the other hand, a prestressing device acts on the flexible element. Therefore, by moving the two parts relative to each other, the force or torque applied to the flexible element can be changed in order to adjust the stiffness of the hairspring assembly.

[0015] However, since the movable parts of the outer stud retainer each perform a rotational movement above the hairspring, the implementation of this hairspring system is complex. In addition, using two outer studs to suspend the hairspring and modify the rate error requires the use of a two-piece outer stud retainer. Summary of the Invention

[0016] The object of the present invention is to overcome some or all of the above - mentioned drawbacks by providing a simplified actuation system that is compatible with this type of speed - regulating device.

[0017] To this end, the present invention relates to a speed - regulating mechanism for a watch movement, the speed - regulating mechanism comprising: an inertial mass body such as a balance wheel, and a hairspring comprising a strip wound in multiple turns, the speed - regulating mechanism comprising an actuation system for adjusting the time - keeping error of the speed - regulating mechanism, the actuation system comprising an actuator mechanically connected to the hairspring, and the time - keeping error of the speed - regulating mechanism can be changed by the displacement of the actuator.

[0018] The present invention is characterized in that the actuator comprises a hook portion engaged with the hairspring, and the stiffness of the hairspring can be changed by the displacement of the actuator.

[0019] By avoiding the need to use two outer studs for suspending the hairspring, the present invention provides a simplified actuation system. This enables the use of a single - piece / one - piece outer stud holder, which is easier to manufacture.

[0020] Furthermore, the actuator can be positioned at a certain distance from the hairspring, and only the hook portion is connected to the hairspring.

[0021] According to a specific embodiment of the present invention, the hairspring comprises an adjusting device for adjusting the stiffness of the hairspring, the adjusting device being provided with a flexible element arranged in series with the wound strip, the adjusting device comprising a prestressing device for applying a variable force or torque to the flexible element to change the stiffness of the flexible element, thereby adjusting the time - keeping error of the speed - regulating mechanism, and the actuator is mechanically connected to the prestressing device.

[0022] According to a specific embodiment of the present invention, the prestressing device comprises a rod connected to the flexible element, and actuation of the rod allows changing the variable force or torque applied to the flexible element.

[0023] According to a specific embodiment of the present invention, the hook portion engages with the rod so that the rod can be displaced when actuated.

[0024] According to a specific embodiment of the present invention, the rod can move within the hook portion such that when the rod undergoes an angular displacement, the rod can slide.

[0025] According to a specific embodiment of the present invention, the hook portion surrounds the rod to form a closed contour.

[0026] According to a specific embodiment of the present utility model, the actuator is configured to at least partially perform a substantially linear, preferably rectilinear displacement in order to actuate the prestressing device.

[0027] According to a specific embodiment of the present utility model, the actuator is eccentric with respect to the speed regulating mechanism and is preferably mounted at a certain distance from the center of the speed regulating mechanism.

[0028] According to a specific embodiment of the present utility model, the actuator includes a stationary part, a spring part, and a movable part that is stationary relative to the balance staff and can move due to the spring part. The movable part includes the hook portion.

[0029] According to a specific embodiment of the present utility model, the movable part can move orthogonally to the direction of the rod.

[0030] According to a specific embodiment of the present utility model, the speed regulating mechanism includes an outer stud holder that is mechanically connected to the flexible element. The outer stud holder includes an outer stud on which the flexible element is mounted.

[0031] According to a specific embodiment of the present utility model, the outer stud holder can rotate relative to the balance staff, so that the beat of the speed regulating mechanism can be adjusted.

[0032] The present utility model also relates to a timepiece movement including such a speed regulating mechanism.

[0033] The present utility model also relates to a timepiece, such as a wristwatch, including such a timepiece movement. Description of the Drawings

[0034] The objects, advantages, and features of the present utility model will become apparent from the following detailed description of several embodiments given by way of non-limiting example with reference to the accompanying drawings, in which:

[0035] - Figure 1 A perspective view of a speed regulating mechanism according to an embodiment of the present utility model is schematically shown. The speed regulating mechanism is arranged in a timepiece movement and includes an actuator provided with a hook portion;

[0036] - Figure 2 A perspective view of a part of the speed regulating mechanism shown in Figure 1 is schematically shown, without the balance staff;

[0037] - Figure 3 A top view of a part of the speed regulating mechanism shown in Figure 1 is schematically shown, without the balance staff, the outer stud holder, and the bearing;

[0038] -Figure 4 Schematically shows Figure 1 a plan view of the hairspring of the speed control mechanism shown in

[0039] - Figure 5 Schematically shows Figure 1 a side view of the actuator of the actuation system of the speed control mechanism in

[0040] - Figure 6 Schematically shows the Figure 5 actuator mounted on the balance cock shown in

[0041] - Figure 7 Schematically shows a perspective view of the actuator and the control lever of the speed control mechanism;

[0042] - Figure 8 Schematically shows Figure 1 a bottom view of the speed control mechanism in

[0043] - Figure 9 Schematically shows a perspective view of the actuator and the control lever of the speed control mechanism in a first position; and

[0044] - Figure 10 Schematically shows a perspective view of the actuator and the control lever of the speed control mechanism in a second position. DETAILED DESCRIPTION

[0045] Figures 1 to 3 Schematically shows an embodiment of a speed control mechanism 1 intended to be arranged in a watch movement, which watch movement includes a main plate (not shown in the figures) provided with a recess. For example, such a movement is arranged in a timepiece such as a watch.

[0046] The speed control mechanism 1 includes: an inertial mass, which in this example is an annular balance wheel 23; a hairspring 25 as an elastic restoring element of the inertial mass, which is configured to oscillate the inertial mass; a balance staff 24; and a balance cock 22. These elements are stacked in the following order from bottom to top: the balance wheel 23, the hairspring 25, and the balance cock 22.

[0047] 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 arranged at both ends of the balance staff 24. The first bearing is arranged below the balance cock 22, and the second bearing 28 is arranged within the balance cock 22. The balance cock 22 has a through hole, and the second bearing 28 is held within this through hole.

[0048] As shown in Figure 3 and 4As shown, the hairspring 25 preferably extends substantially in a plane. The hairspring 25 includes a flexible strip 2 wound around itself for 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 an inner stud. The rigid support 3 is substantially triangular and is assembled around the balance axis 24.

[0049] The hairspring 25 further includes an adjusting device for adjusting its stiffness. For example, when the speed regulating mechanism is installed in the mainplate of a watch movement, the adjusting device can be actuated by the user in particular.

[0050] The adjusting device includes a flexible element 5, which is arranged in series with the strip 2, wherein 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.

[0051] The flexible element 5 adds additional stiffness to the strip 2, that is, immediately after the strip, preferably as an extension of the strip. 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.

[0052] 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.

[0053] The rigid support 17 is L-shaped, wherein the first leg 46 of the L serves as a connecting member to 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.

[0054] 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.

[0055] The prestressing device 6 includes a second flexible blade 21, which is arranged on the opposite side of the rigid portion 18 and within the extension range of the first flexible blade 19.

[0056] 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 will be partially deformed.

[0057] A 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.

[0058] 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.

[0059] In Figures 1 to 3 In the illustrated embodiment, the speed regulating mechanism 1 includes a stud holder 31 provided with a suspended outer stud 34. The stud holder 31 is mechanically connected to the flexible element 5 but does not block the strip 2. The stud holder 31 surrounds the second bearing 28. For this purpose, the stud holder 31 includes a central ring 38 arranged around the second bearing 28, and the central ring 38 rests on the balance cock 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 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, fusion welding, deformation of metallic glass or mechanical fastening.

[0062] The outer stud 34 is capable of moving relative to the balance cock. For this purpose, the stud holder 31 is capable of rotating relative to the balance cock 22 around the second bearing 28. The stud holder 34 is capable of shifting, for example, in an angular range of 20° or even 10°.

[0063] By shifting the outer stud 34 relative to the balance cock 22, the yaw of the speed regulating 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 at least partially perform a substantially linear, preferably straight-line 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 stud holder 31 that rotates by rotating around 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 towards 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 beat error.

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

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

[0069] In Figure 5 and 6 the actuator 30 particularly includes a stationary part 33 mounted on the balance cock 22, a movable part 37 movable relative to the balance cock 22 and connected to the rod 14, and a spring part 35 formed by a flexible guide, the spring part 35 connecting the movable part 37 to the stationary part 33. 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 generally flat and extends substantially in one plane.

[0070] According to the present invention, in order to actuate the rod 14, the actuator 30 includes a hook part 39 engaged 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.

[0071] In an alternative embodiment, as shown in the figure, the hook part 39 surrounds the rod 14 to form a closed contour. This avoids the risk of the hook part 39 separating from the rod 14. Preferably, the contour is substantially square.

[0072] The hook part 39 may further include a rounded part located within the hook part in order to reduce the contact area between the hook part 39 and the rod 14.

[0073] In addition, the rod 14 can move within the hook part 39 so that when the hairspring 25 undergoes an angular displacement, the rod 14 can slide.

[0074] The radial displacement of the movable part 37 of the actuator 30 will radially pull or push the lever 14 relative to the hairspring 25. This will change the stiffness of the flexible element 5 because the displacement of the lever applies a greater or smaller force or torque to 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 adjustment of the beating time difference of the speed regulating mechanism 1.

[0075] 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, each attachment notch being adapted to receive a stud 43, 44 extending from the balance cock 22. The attachment notches 41, 42 are arranged, for example, on diagonally opposite sides of the stationary part 33.

[0076] Each notch 41, 42 is provided with a flexible tongue 48, 49 arranged in the notch 41, 42. The first notch 41 is open on the side such that it can slide laterally around the first stud 43. The second notch 42 is closed and can receive the second stud 44 by inserting it into the second notch 42. When the studs 43, 44 enter the notches 41, 42, the flexible tongues 48, 49 are deformed and serve as support means to hold the studs 43, 44 in the notches 41, 42. In addition, the flexible tongues 48, 49 enable improvement of the positioning accuracy by overcoming the play when the studs 43, 44 are positioned in the notches 41, 42 (preferably in the same direction).

[0077] As shown in the figure, the actuator 30 is mounted on the balance cock 22 so as to be substantially perpendicular to the mainplate and the balance cock 22. Therefore, the actuator 30 is mounted on the edge of the balance cock 22.

[0078] The spring part 35 is arranged below the stationary part 33 such that it extends below the horizontal level of the balance cock 22.

[0079] In this example, the spring part 35 includes a plurality of translation stages / translation levels 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.

[0080] Each translation stage 51, 52, 53, 54 includes 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.

[0081] The first translation stage 51 is arranged below the stationary part 33 and has a first rigid section 56 that is lengthened so as to be associated with a 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 56.

[0082] The second rigid section 57 is also lengthened so as to associate a third translation stage 53 arranged end-to-end with the second translation stage 52, 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 pair of flexible blades 61 and the second pair of flexible blades 62.

[0083] The actuator 30 includes a fourth translation stage 54, which is arranged on a side of the first translation stage 51 different 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.

[0084] In this way, the fourth pair of flexible blades 64 is substantially parallel to the other pairs of flexible blades, and the fourth section 59 is arranged in a direction substantially the same as that of the second section 57.

[0085] The third translation stage 53 and the fourth translation stage 54 are connected by an arm 55 that extends from the third section 58 and passes under the first rigid section 56 of the first translation stage 51.

[0086] This arrangement of the translation stages 51, 52, 53, and 54 enables the movable part 37 to be displaced in a substantially linear, preferably straight-line, manner while keeping the actuator 30 compact.

[0087] 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 during movement.

[0088] 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 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.

[0089] 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 protrusion 68 serves as a support for being able to move the movable part 37.

[0090] By pressing on the projection 68 with more or less force, due to the deformation of the translation platforms 51, 52, 53, 54 of the spring part 35, the movable part 37 moves more or less closer to the stationary part 33.

[0091] In this way, the hook part 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.

[0092] 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.

[0093] Furthermore, the rod 14 is preferably movable in the hook part 39 such that when the rod 14 undergoes an angular displacement, the rod 14 can slide. To this end, the rod 14 includes a free end 15 that cooperates with the hook part 39.

[0094] 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. Accordingly, the hairspring 25 rotates together with the outer stud holder 31, and the free end 15 of the rod 14 slides in the hook part 39.

[0095] With this actuation system 20, it is possible to adjust the yaw without changing the position of the actuator 30 (in particular its 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.

[0096] Therefore, this actuation system 20 enables the rate error and the yaw to be adjusted independently of each other while maintaining a constant predetermined position of the actuator in the movement, for example its position relative to the mainplate and the balance bridge 22.

[0097] The actuation system 20 further includes an adjustment device that cooperates with the actuator 30 in order to be able to displace the movable part 37 of the actuator 30.

[0098] As Figures 7 to 10 shown, the adjustment device includes a pivoting control lever 45 that is arranged to displace the movable part 37 of the actuator 30. The control lever 45 is preferably arranged in a plane that is substantially perpendicular to the plane of the actuator 30 and contacts the projection 68 of the movable part 37.

[0099] The control lever 45 has a pivoting arm 69 and a support arm 71 that are connected to the hub 72 of the pivoting control lever 45.

[0100] 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. Accordingly, the hook part 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.

[0101] The control lever 45 is configured to be mounted on the mainplate of the movement via a hub 72 which is rotatable about a screw 73 mounted on the mainplate.

[0102] Accordingly, by rotating the control lever 45 about the screw 73, the movable part 37 moves towards or away from the stationary part 33 due to the spring part 35 of the actuator 30 being deformed to a greater or lesser extent, thereby changing the position of the rod 14.

[0103] The adjustment device further includes a control screw 70 which is mechanically connected to the pivot 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 pivot arm 69.

[0104] Accordingly, by tightening or loosening the control screw 70, the control lever 45 and the actuator 30 are actuated so as to move the hook part 39 and thus move the rod 14 of the prestressing device 6.

[0105] 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 pivot arm 69 of the control lever 45 is held against the control screw 70.

[0106] 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 part 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 .

[0107] In Figure 10 , the control screw 70, the control lever 45, the movable part 37 of the actuator 30 and the rod 15 are all in a second position, in which the pulling force of the hook part 39 on the rod 15 is greater than that in Figure 9 .

[0108] In the second position, the control screw 70 pushes the pivot arm 69 of the control lever 45, such that the support arm 71 in contact with the projection 68 then pushes the movable part 37 of the actuator 30 towards the stationary part 33 due to 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.

[0109] In this deformed configuration of the spring portion 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.

[0110] A spring 74 is arranged around the screw 73 for pressing the actuator 30 against the balance bridge plate 22 to prevent the actuator 30 from falling off.

[0111] 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 portion 33 of the actuator 30 to which it is attached.

[0112] It goes without saying that the present utility model is not limited to the embodiments of the speed regulating 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. A speed regulating mechanism (1) for a watch movement, the speed regulating mechanism (1) comprising: The invention relates to a speed regulating mechanism (1) comprising a balance wheel (23) as an inertial mass body, and a hairspring (25) comprising a strip (2) wound multiple times, the speed regulating mechanism (1) also comprising an actuation system for adjusting the time difference of the speed regulating mechanism (1), the actuation system comprising an actuator (30) mechanically connected to the hairspring (25), the time difference of the speed regulating mechanism being able to be changed by the displacement of the actuator, characterized in that the actuator (30) comprises a hook (39) engaged with the hairspring (25), the stiffness of the hairspring (25) being able to be changed by the displacement of the actuator (30).

2. The speed regulating mechanism (1) for a watch movement according to claim 1, characterized in that: The balance spring (25) comprises an adjusting device for adjusting the stiffness of the balance spring (25), the adjusting device being provided with a flexible element (5) arranged in series with the wound strip (2), the adjusting device comprising a prestressing device (6) for applying a variable force or torque to the flexible element (5) to change the stiffness of the flexible element (5), thereby adjusting the travel time of the regulating mechanism (1), the actuator (30) being mechanically connected to the prestressing device (6).

3. The speed regulating mechanism (1) for a watch movement according to claim 2, characterized in that: The prestressing device (6) comprises a rod (14) connected to the flexible element (5), the actuation of which makes it possible to vary a variable force or torque exerted on the flexible element (5).

4. The speed regulating mechanism (1) for a watch movement according to claim 3, characterized in that: The hook (39) engages with the rod (14) so ​​as to be able to displace the rod (14) when actuated.

5. The speed regulating mechanism (1) for a watch movement according to claim 4, characterized in that: The rod (14) is movable in the hook (39) so that the rod (14) can slide when the rod (14) is angularly displaced.

6. The speed regulating mechanism (1) for a watch movement according to claim 4 or 5, characterized in that: The hook (39) surrounds the rod (14) to form a closed contour.

7. The speed regulating mechanism (1) for a watch movement according to claim 2, characterized in that: The actuator (30) is configured to perform at least partially a linear displacement in order to actuate the prestressing device (6).

8. The speed regulating mechanism (1) for a watch movement according to any one of claims 1 to 5, characterized in that: The actuator (30) is off-center relative to the speed regulating mechanism (1) and is mounted at a distance from the center of the speed regulating mechanism (1).

9. The speed regulating mechanism (1) for a watch movement according to claim 3, characterized in that: The actuator (30) comprises a stationary part (33) stationary relative to the swing cock (22), a spring part (35), and a movable part (37) movable due to the spring part (35), the movable part (37) comprising the hook (39).

10. The speed regulating mechanism (1) for a watch movement according to claim 9, characterized in that: The movable portion (37) is movable in a direction orthogonal to the rod (14).

11. The speed regulating mechanism (1) for a watch movement according to claim 9, characterized in that: The speed regulating mechanism comprises a stud holder (31) mechanically connected to the flexible element (5), the stud holder (31) comprising a stud (34) on which the flexible element (5) is mounted.

12. The speed regulating mechanism (1) for a watch movement according to claim 11, characterized in that: The stud holder (31) can rotate relative to the balance cock (22) to adjust the deflection of the speed regulating mechanism (1).

13. A watch movement, characterized in that: The timepiece movement comprises a regulating organ (1) for a timepiece movement according to any one of the preceding claims.

14. A timepiece, characterized in that: The timepiece comprises a timepiece movement according to claim 13 .

Images