Stud holder for a timepiece regulating member provided with means for adjusting the running and / or isochronism

Abstract

The invention relates to a stud holder for a regulating member (150) of a watch movement, the regulating member (150) comprising an inertial mass, for example a balance (41), a balance spring (44) comprising a ribbon wound on itself in several turns, and a balance bridge (42), the stud holder (120) comprising a main body (2) intended to be mounted on the balance bridge (42), a secondary body (3) arranged at a distance from the main body (2) and configured to suspend the balance spring (44), the regulating member (150) comprising a flexible element (5) connecting the main body (2) to the secondary body (3), the stud holder (120) comprising prestressing means (6) for applying a variable force or torque to the flexible element (5) in order to adjust the rate and / or the isochronism slope of the member regulating (150).

Description

Technical field of the invention

[0001] The invention relates to the field of watchmaking, and more particularly to the field of mechanical watchmaking, where the regulation of the driving energy is provided by a regulating organ.

[0002] The invention relates more specifically to a stud holder for a timepiece regulating organ provided with means for adjusting the rate and / or isochronism, as well as a regulating organ comprising such a stud holder, and a timepiece movement comprising such a regulating organ. Technological background

[0003] In most mechanical watches, the energy required to rotate the hands (e.g., the minute and hour hands) is stored in a barrel and then delivered by a balance-spring system, which includes a flywheel called a balance wheel, combined with a spring in the form of a spiral-wound ribbon called a balance spring.

[0004] At one internal end, the balance spring is fixed to a shaft which rotates with the balance wheel; at one external end, the balance spring is fixed to a stud mounted on a stud holder which is itself fixed to a fixed bridge (or balance cock).

[0005] The balance wheel's rotation is maintained - and its oscillations counted - by an escapement mechanism comprising an anchor driven by a low-amplitude oscillating movement, equipped with two pallets which engage the teeth of an escape wheel. Thus engaged, the escape wheel is imposed a step-by-step rotational movement whose frequency is determined by the oscillation frequency of the anchor, itself set to the oscillation frequency of the sprung balance.

[0006] In a traditional escapement mechanism, the oscillation frequency is about 4 Hz, or about 28,800 vibrations per hour (A / h). One of the goals of good watchmakers is to ensure isochronism and regularity of oscillation (or constant rate) of the sprung balance.

[0007] It is known to regulate the rate of the balance spring by adjusting the active length of the balance spring, defined as the curvilinear length between its internal end and a counting point, located near the external end of the balance spring and generally defined by a pair of stops carried by a key mounted on a rack system.

[0008] In operation, this index system is fixed in rotation relative to the balance spring axis. However, it is possible, by manual intervention, to finely adjust its angular position, e.g. by pivoting, using a screwdriver, an eccentric acting on the index system in the manner of a cam.

[0009] The assembly comprising the bridge, the index system, the key, the stud holder, the stud, the arbor, the balance spring and the balance wheel is commonly referred to as the "regulating organ". Examples of regulating organs are provided by international application WO 2016 / 192957 and by European patent EP 2 876 504, both in the name of the watch manufacturer ETA.

[0010] There are indexing systems that have a stud holder to which one end of the hairspring is attached, and whose indexing system key leaves a clearance to allow the hairspring to move between the two stops. However, the chronometric properties, in particular the anisochronism as a function of the amplitude, are very sensitive to the play in the index key, while this play is difficult to control precisely.

[0011] In some devices, the stops are adjustable to tighten the hairspring to eliminate play, especially during operation of the hairspring. In this case, the rate is first adjusted by moving the index key, then the hairspring is tightened with the key. But tightening the hairspring with the index key risks constraining it, and creating timekeeping defects, particularly by off-centering of the coils. In addition, removing play also modifies the rate, and once the hairspring is tightened, the index key can no longer be moved along the hairspring to finish fine-tuning the rate.

[0012] Other hairsprings have integrated rate adjustment means. In these hairsprings, the rate 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. This allows the stiffness of the flexible element and therefore of the hairspring as a whole to be changed. Adjusting the stiffness of the hairspring makes it possible to adjust the rate of the regulating member. Such a hairspring with a flexible element is, for example, described in patent applications EP21202213.1 and CH0700385 / 2021.

[0013] In these cases, the usual systems cannot be used, as they are not compatible with the balance spring adjustment device. In addition, since the rate is to be adjusted very finely, it is essential that there is no play between the balance spring and its interaction zones with the index assembly. Indeed, otherwise, there would be a risk of modifying the rate in the event of an impact, if the balance spring does not reposition itself in exactly the same way after the impact.

[0014] To use such a balance spring, a counter-rotation system has been described in patent applications EP22177059.7 and CH000678 / 2022. The counter-rotation system comprises a stud holder in two parts that can move relative to each other, each element being provided with a stud on which the flexible element is mounted on the one hand, and the pre-stressing means acting on the flexible element on the other hand. Thus, by moving the two elements relative to each other, the force or torque applied to the flexible element is modified, in order to adjust the stiffness of the balance spring.

[0015] However, the index system is complex to implement, because the moving elements of the piton holder each perform a rotary movement above the balance spring.

[0016] Furthermore, in these patent applications, the spiral spring has a particular shape, because the flexible element and the pre-stressing means are mounted directly on the spiral spring, or even the spiral spring and the adjustment means are monobloc. Thus, it is not possible to use a conventional spiral spring with this index system.

[0017] Furthermore, it may also be necessary to be able to adjust the isochronism slope of the regulating organ. Summary of the invention

[0018] The aim of the present invention is to overcome all or part of the drawbacks mentioned above by proposing a stud holder compatible with conventional balance springs, and which can provide the same advantages of precision in the adjustment of the rate and / or isochronism as a balance spring provided with adjustment means such as that of the state of the art.

[0019] For this purpose, the invention relates to a stud holder for a regulating member of a watch movement, the regulating member comprising an inertial mass, for example a balance, a balance spring comprising a ribbon wound on itself in several turns, and a balance bridge, the stud holder comprising a main body intended to be mounted on the balance bridge, a secondary body arranged at a distance from the main body and configured to suspend the balance spring, the regulating member comprising a flexible element connecting the main body to the secondary body.

[0020] The invention is remarkable in that the stud holder comprises prestressing means for applying a variable force or torque to the flexible element in order to adjust the rate and / or the isochronism slope of the regulating member.

[0021] Thanks to the invention, it is possible to use hairsprings of conventional shape, that is to say, in particular without a flexible element mounted or formed directly on the hairspring. Indeed, the flexible element is arranged on the stud holder, so that it is sufficient to mount the hairspring on the stud holder to obtain the same advantages as a hairspring provided with means for adjusting the stiffness of the state of the art.

[0022] The flexible element and the prestressing means of the stud holder form means for adjusting the rate and / or isochronism of a regulating organ fitted with a spiral spring.

[0023] By acting on the prestressing means, the force or torque applied to the flexible element is modified, which results in a modification of the stiffness of the assembly comprising the flexible element and the ribbon. Indeed, the flexible element placed in series with the ribbon provides additional stiffness to the ribbon, which is added to the remainder of the ribbon. Thus, when the prestressing means apply a variable force or torque to the flexible element, they modify the stiffness of the flexible element and therefore of the assembly comprising the ribbon and the flexible element.

[0024] Thus, on the one hand, the stiffness of the flexible element can be adjusted, to adjust the operation of the regulating organ. On the other hand, the flexible element allows the secondary body to rotate relative to the main body, and consequently, to adjust the isochronism slope of the regulating organ.

[0025] In addition, the need for complex spiral spring manufacturing is avoided.

[0026] According to a particular embodiment of the invention, the flexible element comprises two crossed flexible blades connecting the main body to the secondary body.

[0027] According to a particular embodiment of the invention, the two flexible blades are attached to each other at their crossing.

[0028] According to a particular embodiment of the invention, the flexible element comprises two uncrossed flexible blades connecting the main body to the secondary body.

[0029] According to a particular embodiment of the invention, the flexible element comprises a flexible neck connecting the main body to the secondary body.

[0030] According to a particular embodiment of the invention, the flexible element comprises a flexible blade connecting the main body to the secondary body.

[0031] According to a particular embodiment of the invention, the flexible element comprises two substantially parallel flexible blades connecting the main body to the secondary body to form a translation table.

[0032] According to a particular embodiment of the invention, the main body comprises an arm on which the flexible element is assembled.

[0033] According to a particular embodiment of the invention, the flexible element has a stiffness greater than that of the ribbon.

[0034] According to a particular embodiment of the invention, the torque or force is continuously adjustable by the prestressing means.

[0035] According to a particular embodiment of the invention, the prestressing means comprise a movable lever arranged to bear against the flexible element.

[0036] According to a particular embodiment of the invention, the prestressing means comprise a spring connected to the secondary body and a first movable body making it possible to stretch or compress the spring.

[0037] According to a particular embodiment of the invention, the spring comprises a secondary flexible blade.

[0038] According to a particular embodiment of the invention, the spring comprises several tertiary flexible blades connecting the main body to the first mobile body.

[0039] According to a particular embodiment of the invention, the spring comprises several quaternary flexible blades connecting the first mobile body to a second mobile body of the prestressing means.

[0040] According to a particular embodiment of the invention, the prestressing means comprise a plurality of rigid sections connected by flexible necks or flexible blades.

[0041] The invention also relates to a timepiece regulating organ comprising an inertial mass, for example a balance wheel, a spiral spring comprising a ribbon wound on itself in several turns, a balance bridge, and such a stud holder.

[0042] The invention also relates to a clockwork movement comprising such a clockwork regulating organ. Brief description of the figures

[0043] The aims, advantages and characteristics of the present invention will appear on reading several embodiments given solely as non-limiting examples, with reference to the appended drawings in which: there Figure 1 schematically represents a top view of a piton holder according to a first embodiment of the invention, the Figure 2 schematically represents a top view of a piton holder according to a second embodiment of the invention, the Figure 3schematically represents a top view of a piton holder according to a third embodiment of the invention, the Figure 4 schematically represents a top view of a piton holder according to a fourth embodiment of the invention, the Figure 5 schematically represents a top view of a piton holder according to a fifth embodiment of the invention, the Figure 6 schematically represents a top view of a piton holder according to a sixth embodiment of the invention, the Figure 7 schematically represents a top view of a piton holder according to a seventh embodiment of the invention, the figure 8 schematically represents a perspective view of a piton holder according to an eighth embodiment of the invention, the Figure 9 schematically represents a top view of a piton holder according to a ninth embodiment of the invention, the Figure 10schematically represents a top view of a piton holder according to a tenth embodiment of the invention, the Figure 11 schematically represents a top view of a piton holder according to an eleventh embodiment of the invention, the Figure 12 schematically represents a top view of a piton holder according to a twelfth embodiment of the invention, the figure 13 schematically represents a top view of a piton holder according to a thirteenth embodiment of the invention, the Figure 14 schematically represents a top view of a regulating member provided with a stud holder according to a thirteenth embodiment of the invention, the Figure 15 schematically represents a top view of a piton holder according to a fourteenth embodiment of the invention, and the figure 16 schematically represents a top view of a piton holder according to a fifteenth embodiment of the invention. Detailed description of the invention

[0044] THE figures 1 to 16 show, each, a schematic representation of a different embodiment of a stud holder 1, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140 according to the invention. Such a stud holder 1, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140 is intended to be arranged in a regulating member of a watch movement. The piton holders 1, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140 preferably extend substantially in the same plane.

[0045] The regulating organ generally comprises an inertial mass, for example a balance wheel, a hairspring, and a balance bridge allowing it to be assembled on a plate of a watch movement.

[0046] In particular, the function of the stud holder 1, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140 is to suspend the spiral spring extending substantially in a plane. Such a spiral spring comprises a flexible ribbon wound on itself in several turns, the ribbon having a predefined stiffness.

[0047] On the figures 1 to 16 , the stud holder 1, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140 comprises a main body 2 intended to be mounted on the balance bridge, for example around a bearing holding the balance shaft. The main body 2 has for example a ring shape, which can be arranged around the bearing.

[0048] The stud holder 1, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140 further comprises a secondary body 3 arranged at a distance from the main body 2. The secondary body 3 comprises a housing for inserting and holding a first end of a stud, preferably towards the underside of the balance bridge.

[0049] Depending on the embodiments, the secondary body 3 has an annular or rectangular shape.

[0050] The main body 2 and the secondary body 3 are connected, preferably only, by a flexible element 5. Thus, the stiffness of the flexible element 5 is added to the stiffness of the spiral spring. The stiffness of the flexible element 5 is preferably greater than that of the spiral spring. Thanks to the deformation of the flexible element 5, the secondary body 3 can be movable relative to the main body.

[0051] According to the invention, the stud holder 1, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140 comprises pre-stressing means 6 for applying a variable force or torque to the flexible element 5 in order to adjust the rate of the spiral spring. Thus, the stiffness of the assembly comprising the spiral spring and the flexible element 5 can be adjusted.

[0052] The prestressing means 6 preferably allow the flexible element 5 to perform a translational or rotational movement in the plane of the spiral spring, to modify the isochronism slope of the regulating member.

[0053] Thus, the stiffness of the flexible element 5 is varied, which deforms little under the effect of the prestressing means 6, preferably in a rest position of the spiral spring. The flexible element 5 deforms more or less when the prestressing means 6 act on it. Thus, by varying the force or torque provided by the prestressing means 6, the stiffness of the flexible element 5 is modified.

[0054] Preferably, to modify the step without having an effect on the isochronism curve, the end of the ribbon remains substantially immobile, regardless of the adjustment of the prestressing means 6. The force or torque applied to the flexible element 5 does not substantially modify the position of the end of the ribbon to which the flexible element is assembled. Only the flexible element 5 is acted upon to modify its stiffness without acting directly on the ribbon. This provides even greater precision because a single element is used for adjusting the stiffness. During oscillations, the end 4 of the ribbon may be mobile.

[0055] In addition, the torque or force is continuously adjustable by the prestressing 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.

[0056] In most of the embodiments of the bolt holder 1, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140 described below, the prestressing means 6 are represented by a screw 7, which presses more or less strongly on the secondary body 3 or on an intermediate structure. However, other prestressing means 6 are of course possible, such as a lever, a pusher or an eccentric for example.

[0057] The prestressing means 6 are applied directly to the secondary body 3.

[0058] The first embodiment of piton holder 1, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140 of the Figure 1 describes a flexible element 5 comprising a substantially straight flexible blade 4 connected to the main body 2 and to the secondary body 2. Under the effect of the prestressing means 6, the stiffness of the flexible blade 4 changes.

[0059] In the example of the Figure 2, the flexible element 5 of the spiral spring 1 comprises a neck 8 thinned in the thickness of the material, the neck 8 being flexible. Thus, by applying a variable force or torque to the secondary body, the stiffness of the neck 8 and therefore of the assembly comprising the ribbon 2 and the flexible element 5 is modified.

[0060] On the Figure 3 , the flexible element 5 comprises a translation table. The translation table comprises at least one flexible blade, here two flexible blades 9, and a rigid part 11 comprising the secondary body 3. The flexible blades 9 are joined by one end to the secondary body 3, and by another end to the main body 2. The flexible blades 9 are substantially parallel and are arranged on different lines.

[0061] The secondary body 3 is preferably arranged in the middle of the rigid part 11. In the figure, the variable force or torque is applied to the rigid part 11, in the direction of the flexible blades 9. Due to the bending of the flexible blades 9, the rigid part 11 can move slightly. The movement of the rigid part 11 varies the stiffness of the flexible element 5.

[0062] In the embodiments of the piton doors 30, 40, 50, 60, 70 of the figures 4 to 8 , the main body 2 comprises an arm 12 extending substantially tangentially to the ring. The flexible element 5 is connected to the arm. In these embodiments, the force or torque is not directed towards the main body, as in the first embodiments, but towards the arm 12, perpendicular to the arm 12.

[0063] There Figure 4shows an embodiment, in which the piton holder 30 comprises a translation table similar to that of the third embodiment of the Figure 3 , but the translation table is mounted on the arm 12, perpendicularly. The flexible blades 9 of the translation table are connected to the arm 12 and extend tangentially to the main body 3.

[0064] The flexible element 5 of the piton holder 40 of the Figure 5 comprises a pivot with crossed flexible blades, the pivot comprising two crossed flexible blades 13 connected on the one hand to the secondary body 3, and on the other hand to the main body 2. The pivot with crossed flexible blades 13 is arranged so that the crossing of the flexible blades 13 is in the extension of the direction of the variable force or torque applied to the secondary body 3.

[0065] There Figure 6shows an embodiment of a piton holder 50 comprising a pivot with crossed flexible blades 14, the pivot comprising two crossed flexible blades 14 joined at their crossing 15. The flexible blades 14 are connected on the one hand to the main body 2, and on the other hand to the secondary body 3.

[0066] In the embodiments of the piton holders 60, 70, 80, 90, 100, 110, 120 of the figures 7 to 14 , the flexible element 5 comprises a pivot with uncrossed flexible blades. The pivot comprises two uncrossed flexible blades 16. The flexible blades 16 are joined, on the one hand laterally to the main body 2 directly or to a peripheral arm 12, and on the other hand to the secondary body 3 by approaching each other. The center of rotation of the pivot with uncrossed flexible blades is the virtual crossing point of the blades 16. This center of rotation is preferably located at the center of the secondary body 3, or on the stud axis 41.

[0067] The 60 piton holder of the Figures 7 and 8 comprises an arm 12 oriented differently and to which the pivot with uncrossed blades 16 is attached.

[0068] On the figure 8 , a stud 41 is shown extending below the stud holder 70, in order to hold a spiral spring 17. The stud 41 comprises a notch 42 at its second end. The notch 42 is configured to retain an outer end of the spiral spring 17. The stud 41 and the housing preferably have a substantially cylindrical shape. The assembly of the stud 41 and the spiral spring 17 is for example carried out by gluing, brazing, welding, by deformation of metallic glass, or by mechanical fixing.

[0069] In the embodiment of the 80 piton holder of the Figure 9 , the flexible blades 16 of the flexible element 5 extend on either side of the main body 2, to be connected to tabs connected to the main body 2.

[0070] The prestressing means 6 comprise a lever 19 in direct contact with the secondary body 3 at a first end 18, and comprising fixing means 22 at a second end. The prestressing means 6 further comprise a cam 21 on which the lever 19 rests. Thus, by actuating the cam 21, the lever 19 presses more or less strongly on the secondary body 3 to modify the stiffness of the flexible element 5. The blades 16 preferably cross at the first end 18.

[0071] The prestressing means 6 of the stud protector 90 of the embodiment of the Figure 10 comprise a spring 24 and a movable body 25. The spring 24 is joined to the secondary body 3 on the one hand, and to the movable body 25 on the other hand. Thus, by moving the movable body 25, the spring 24 transmits a variable force or torque to the secondary body 3 in order to adjust the stiffness of the flexible element 5.

[0072] The embodiment of the 100 piton holder of the Figure 11 shows a variant of the embodiment of that of the Figure 10 , in which a secondary flexible blade 28 is arranged between the spring 24 and the secondary body 3, in the extension of the spring 24.

[0073] For this purpose, the prestressing means 6 are provided with a second movable body 29 to which the spring 24 is connected on one side, and the secondary flexible blade 28 on the other side. The secondary flexible blade 28 is connected to the second movable body 29 and to the secondary body 3. By acting on the first movable body 25, the prestressing means 6 modify the variable force or torque acting on the secondary body 3 via the second body 29 and the secondary flexible blade 28.

[0074] In the 90, 100, 110 piton gates of the figures 10 to 12, the main body 2 comprises a second arm 27, 32 extending from the main body 2 to form with the first arm 12 a guide volume for the first movable body 25.

[0075] On the Figure 12 , the secondary body 3 of the piton holder 110 comprises a third arm 31 extending laterally from the secondary body 3. The prestressing means 6 bear more or less on the first arm 12. The second arm 32 and the third arm 31 are substantially parallel in the rest position of the piton holder 110. The second arm 32 here comprises the screw of the prestressing means 6, which bears on the third arm 31, offset relative to the secondary body 3.

[0076] Thus, when the screw of the prestressing means 6 presses on the third arm 31, the third arm 31 rotates around a center of rotation arranged at the intersection of the uncrossed blades 16, and drives the secondary body 3 in rotation. The end of the uncrossed blades 16 connected to the secondary body 3 move, so that the stiffness between the uncrossed blades 16 is substantially modified between them. This difference in stiffness between the two uncrossed blades 16 makes it possible to modify the isochronism slope of the regulating member.

[0077] The embodiment of the 120 piton holder of the figures 13 and 14 comprises prestressing means 6 provided with a spring formed of a flexible blade guide. A secondary flexible blade 28 connects the secondary body 3 to a first elongated rigid body 34 extending in the extension of the secondary flexible blade 28.

[0078] The prestressing means 6 comprise a second rigid body 37, as well as tertiary blades 36, here three blades, connecting the two rigid bodies 34, 37. The two rigid bodies 34, 37 are movable and have segments that are substantially parallel two by two in the rest position of the prestressing means 6. The tertiary blades 36 are substantially perpendicular to the secondary blade 28 in the rest position of the prestressing means 6. The prestressing means 6 further comprise two quaternary blades 33 connecting the first body 34 to a third arm 35 extending from the main body 2. The third arm is substantially parallel and oriented on the same side as the second arm.

[0079] The quaternary blades 33 are substantially parallel to the tertiary blades 36 and arranged on the same side of the second rigid body 37. By applying a variable force or torque to the second rigid body 37, the prestressing means 6 vary the stiffness of the flexible element 5 to modify the operation of the regulating member. The prestressing means 6 are arranged in the axis of the flexible element 5.

[0080] On the Figure 14 , a folded variant of the 120 piton holder of the embodiment of the figure 13 is mounted on a regulating member 150 comprising a balance spring 44, a balance wheel 41, a balance bridge 42, and a bearing 43. The main body 2 of the stud holder 120 is mounted on the balance bridge 42 around the bearing 43. The balance wheel 41 is arranged under the balance bridge 42, and above the balance spring 44. The body 3 comprises a clamp in order to hold the stud.

[0081] In the embodiment of the piton holder 130 of the Figure 15 , the prestressing means 6 are configured to allow adjustment of the step and the isochronism slope. The main body 2 comprises a first straight arm 12 and a second U-shaped arm 32.

[0082] The prestressing means 6 comprise a peripheral reinforcement 45 partially surrounding the main body 2 and the secondary body 3, substantially describing a pentagon shape with one face missing. The peripheral reinforcement 45 is connected to the secondary body 3 by a first pair of uncrossed flexible blades 16, as well as to the first straight arm 12 of the main body 2 by a second pair of flexible blades 46.

[0083] The prestressing means 6 are provided with a secondary blade 28 connected to the secondary body 3, as well as a first mobile body 25 in the shape of an L and a second mobile body 29 in the shape of a U. The secondary flexible blade 28 is connected to the inside of the U of the second mobile body 29, which is oriented towards the secondary body 3.

[0084] The prestressing means 6 comprise two tertiary blades 33 and two quaternary blades 36 arranged in continuity with each other, and perpendicular to the secondary flexible blade 28 in the rest position of the prestressing means 6. The tertiary blades 33 connect the second mobile body 29 to the peripheral frame, while the quaternary flexible blades 36 connect the second mobile body 29 to the first mobile body 25.

[0085] The prestressing means 6 here comprise two screws. A first screw 7 is arranged through a first curved end 48 of the peripheral frame 45 to press on the first movable body 25. A second screw 47 is arranged through the second arm 32 of the main body 2 to press on a second end 49 of the peripheral frame 45.

[0086] The first screw 7 allows the rate of the regulating organ to be modified, while the second screw 47 allows the isochronism slope of the regulating organ to be modified.

[0087] Indeed, by actuating the second screw 47, the peripheral frame 45 rotates around a center of rotation corresponding to the crossing of the second pair of flexible blades 46 and the secondary body 3. This rotation modifies the stiffness between the two uncrossed blades 16, in the same way as the embodiment of the Figure 12 .

[0088] In the embodiment of the 140 piton holder of the figure 16 , the flexible element 5 is a collar 8 similar to the piton holder 10 of the Figure 2 , and the prestressing means 6 are provided with a plurality of elongated rigid sections, here two rigid sections 51, 52, joined by flexible necks 53, 54. In the rest position, the rigid sections 51, 52, and the flexible necks 53, 54 are arranged substantially on a straight line.

[0089] In this embodiment, the flexible necks 53, 54 could be replaced by flexible blades of length similar to the necks.

[0090] The prestressing means 6 are also provided with a spring formed of flexible blades, similar to the embodiment of the piton holder 120 of the figure 13 The tertiary 33 and quaternary 36 flexible blades are connected to the second section 52 of the prestressing means 6.

[0091] By applying a variable displacement to the mobile rigid body 37, the prestressing means 6 vary the stiffness of the flexible element 5. The force or torque is transmitted in part to the second rigid section 52, and to the flexible element 5 by means of the first rigid section 51, via the flexible necks 53, 54. Thus, the operation of the regulating member is varied.

[0092] 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

1. Stud holder for a regulating member (150) of a watch movement, the regulating member (150) comprising an inertial mass, for example a balance (41), a balance spring (17, 44) comprising a ribbon wound on itself in several turns, and a balance bridge (42), the stud holder (1, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140) comprising a main body (2) intended to be mounted on the balance bridge (42), a secondary body (3) arranged at a distance from the main body (2) and configured to suspend the balance spring (17, 44), the regulating member comprising a flexible element (5) connecting the main body (2) to the secondary body (3), characterized in that the piton holder (1, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140) comprises prestressing means (6) for applying a variable force or torque to the flexible element (5) in order to adjust the rate and / or the isochronism slope of the regulating member (150).

2. Piton holder according to claim 1, characterized in that the flexible element (5) comprises two crossed flexible blades (13, 14) connecting the main body (2) to the secondary body (3).

3. Piton holder according to claim 2, characterized in that the two flexible blades (14) are attached to each other at their crossing (15).

4. Piton holder according to claim 1, characterized in that the flexible element (5) comprises two uncrossed flexible blades (16) connecting the main body (2) to the secondary body (3).

5. Piton holder according to claim 1, characterized in that the flexible element (5) comprises a flexible neck (8) connecting the main body (2) to the secondary body (3).

6. Piton holder according to claim 1, characterized in that the flexible element (5) comprises a flexible blade (4) connecting the main body (2) to the secondary body (3).

7. Piton holder according to claim 1, characterized in thatthe flexible element (5) comprises two substantially parallel flexible blades (9) connecting the main body (2) to the secondary body (3) to form a translation table.

8. Piton holder according to any one of the preceding claims, characterized in that the main body (2) comprises an arm (12) on which the flexible element (5) is assembled.

9. Piton holder according to any one of the preceding claims, characterized in that the flexible element (5) has a stiffness greater than that of the ribbon.

10. Piton holder according to any one of the preceding claims, characterized in that the torque or force is continuously adjustable by the prestressing means (6).

11. Piton holder according to any one of the preceding claims, characterized in that the prestressing means comprise a movable lever (19) arranged to bear against the flexible element (5).

12. Piton holder according to any one of claims 1 to 10, characterized in that the prestressing means (6) comprise a spring (24) connected to the secondary body (3) and a first movable body (25, 34) making it possible to stretch or compress the spring (24).

13. Piton holder according to claim 12, characterized in that the spring includes a secondary flexible blade (28).

14. Piton holder according to claim 12 or 13, characterized in that the spring comprises several tertiary flexible blades (33) connecting the main body (2) to the first movable body (34).

15. Piton holder according to claim 14, characterized in that the spring comprises several quaternary flexible blades (36) connecting the first mobile body (34) to a second mobile body (37) of the prestressing means (6).

16. Piton holder according to any one of claims 1 to 10, characterized in thatthe prestressing means (6) comprise a plurality of rigid sections (51, 52) connected by flexible necks (52, 54) or flexible blades (101).

17. Regulating organ for a watch movement, the regulating organ (150) comprising an inertial mass, for example a balance (41), a spiral spring (44) comprising a ribbon wound on itself in several turns, a balance bridge (42) and a stud holder (120) according to any one of the preceding claims.

18. Clockwork, characterized in that it comprises a regulating member (150) according to claim 17.

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