Spiral spring for a resonator mechanism for a timepiece having means for adjusting rigidity

Abstract

To provide a spiral spring provided with effective and accurate adjustment means.SOLUTION: A spiral spring for a horological resonator mechanism comprises a flexible strip 2 coiled around itself into several turns, the strip 2 having predefined stiffness. The spiral spring includes adjustment means for adjusting its stiffness. The adjustment means includes a unique elongate flexible element 5 arranged in series with the strip 2. The elongate flexible element 5 connects one end 4 of the strip 2 to a fixed support 11 so as to add additional stiffness to the strip 2. Preferably, the flexible element 5 has higher stiffness than the strip 2. The adjustment means comprises prestressing means 6 for applying at least two different stresses. The prestressing means 6 includes a first lever attached to the end 4 of the strip 2 to allow adjustment of a first stress. The prestressing means 6 includes a second lever 15 attached to the end 4 of the strip 2 to allow adjustment of a second stress independently of the first stress.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a spiral spring for a resonator mechanism for a timepiece, and includes means for setting the rigidity of the spiral spring. The present invention further relates to a resonator mechanism for a timepiece including such a spiral spring.

Background Art

[0002] Most of the current mechanical portable timepieces (e.g., wristwatches, pocket watches) are equipped with a spiral balance of the Swiss pallet type and an escapement mechanism. This spiral balance forms the time base of the portable timepiece. This spiral balance is also called a resonator.

[0003] Next, the escapement - Functions to maintain the reciprocating motion of the resonator - Functions to count these reciprocating motions exerts two main functions.

[0004] To form a mechanical resonator, an inertial element, a guide, and an elastic restoring element are required. Traditionally, the spiral spring functions as an elastic restoring element for the inertial element formed by the balance. This balance is rotatably guided by a pivot that rotates within a plane bearing made of ruby.

[0005] Generally, the spiral spring of the balance should be adjustable to improve the accuracy of the portable timepiece. For this purpose, adjustment means for adjusting the rigidity of the spiral spring, such as an index for changing the effective length of the spring, is used. In this way, the rigidity of the spiral spring is changed to adjust the running accuracy of the portable timepiece. However, the effectiveness of the traditional index for adjusting the running is limited and is not necessarily effective for setting accurately enough up to a range of several seconds or several tens of seconds per day.

[0006] To adjust the running more precisely, there is setting means comprising one or more screws arranged at the periphery of the balance. By acting on the screws, the inertia of the balance changes, thereby changing the running of the balance.

[0007] However, this setting method is not easy to execute. This is because it disturbs the balance of the balance and does not enable the setting of the running of the oscillator to be precise enough.

Summary of the Invention

Problems to be Solved by the Invention

[0008] The present invention is intended to overcome all or part of the above problems by providing a hairspring having effective and accurate adjusting means, which is configured to set the running of a timepiece by changing the effective stiffness of the hairspring.

Means for Solving the Problems

[0009] For this purpose, the present invention relates to a hairspring, particularly for a resonator mechanism of a timepiece, the hairspring comprising a flexible elongate member forming a plurality of turns wound around itself, the elongate member having a predetermined stiffness, the hairspring comprising adjusting means for adjusting its stiffness, the adjusting means comprising a specific elongate flexible element arranged in series with the elongate member, the elongate flexible element connecting one end of the elongate member to a fixed support to add additional stiffness to the elongate member, the elongate flexible element preferably having a higher stiffness than the stiffness of the elongate member, and the adjusting means comprising pre-stress means for exerting at least two different stresses (efforts).

[0010] The prestressing means is attached to the end of the elongated member and includes a first lever that enables adjustment of a first stress. The prestressing means is attached to the end of the elongated member and includes a second lever that enables adjustment of a second stress independently of the first stress. In this regard, the present invention is revolutionary.

[0011] Thanks to the present invention, it is possible to vary the stiffness of an elongated flexible element such as a flexible blade. In fact, when two stresses are applied, the stiffness of the elongated flexible element changes. Whether it is a force or a couple, when a single stress is applied, the stiffness of the elongated flexible element remains the same. When two perpendicular forces, one in the longitudinal direction and the other in the direction perpendicular to the longitudinal direction, are applied to the blade, an overall force is obtained, which causes the stiffness of the elongated flexible element to change. The stiffness also changes due to force and couple. Combining two stresses is essential to enable changing the stiffness.

[0012] By acting on the prestressing means, the intensity level of the load is changed, which in turn changes the stiffness of the combination including the flexible element and the elongated member. In fact, a flexible element installed in series with the elongated member increases the stiffness, and this stiffness is combined with the stiffness of the elongated member. Therefore, when the prestressing means applies a variable stress to the elongated flexible element, regardless of the variable force applied to the elongated flexible element, it changes the stiffness of the flexible element, and thus the stiffness of the combination including the elongated member and the flexible element, without changing the stiffness of the elongated member.

[0013] That is, a flexible element is arranged in series with the elongated member between one end of the elongated member and the fixed support. This flexible element provides adjustable additional rigidity between the elongated member and the attachment point of the elongated member, thus increasing the flexibility of the resonator. Therefore, the rigidity of the elongated member and the rigidity of the flexible element contribute to the effective rigidity of the resonator. A variable stress for applying a prestress to the flexible element is preferably applied without applying a prestress to the elongated member. By applying a prestress to the flexible element, its rigidity changes while the rigidity of the elongated member remains substantially unchanged. By changing the rigidity of the flexible element, the rigidity of the resonator (the rigidity of the elongated member and the rigidity of the flexible element) changes, thereby changing the running of the resonator.

[0014] Therefore, by changing the rigidity of the flexible element, the rigidity of the entire resonator changes, and as a result, its running can be precisely set, thereby enabling accurate adjustment of the time - base frequency. In this way, a very high accuracy can be obtained in the setting of the running because one single additional element acts to adjust the rigidity of the spiral spring.

[0015] Also, each of the two levers can perform the setting of the prestress independently of each other to achieve a more accurate setting. Furthermore, if the levers are different from each other, two different intensity settings can be obtained.

[0016] In a particular embodiment of the present invention, the first stress is exerted by any one of a first tensile / compressive force substantially directed in the longitudinal direction of the elongated flexible element, or a first force substantially directed in a direction substantially orthogonal to the longitudinal direction of the elongated flexible element, or preferably a first torque M, which is a bending moment, thereby changing the rigidity of the elongated flexible element according to the level of the prestress.

[0017] In certain embodiments of the present invention, the second stress is a second tensile / compressive force F that is substantially directed along the longitudinal direction of the elongated flexible element L2 , or a second force F that is substantially directed in a direction substantially orthogonal to the longitudinal direction of the elongated flexible element T2 , or a second torque M2, which is preferably a bending moment, exerted by any of them, thereby changing the stiffness of the elongated flexible element according to the level of the pre-stress.

[0018] In certain embodiments of the present invention, the pre-stress means is configured to exert a third stress on the elongated flexible element, and the third stress is a force that is substantially directed in a direction substantially orthogonal to the longitudinal direction of the elongated flexible element, or preferably a torque, which is a bending moment, exerted at the location where the first stress is exerted.

[0019] In certain embodiments of the present invention, the pre-stress means is configured to exert a third stress on the elongated flexible element, and the third stress is exerted by either the first tensile / compressive force or the first torque at the location where the first stress is exerted.

[0020] In certain embodiments of the present invention, the third stress is adjustable by the first lever.

[0021] In certain embodiments of the present invention, the pre-stress means is configured to exert a fourth stress on the elongated flexible element, and the fourth stress is exerted by either the second tensile / compressive force, or the second force in the substantially orthogonal direction, or the second torque, at the location where the second stress is exerted.

[0022] In certain embodiments of the present invention, the fourth stress is adjustable by the second lever.

[0023] In a particular embodiment of the present invention, the prestressing means is configured to apply a fifth stress to the elongated flexible element, and the fifth stress is applied at the location where the first stress is applied by any one of the first tensile / compressive force, or the first force in a substantially orthogonal direction, or the first torque.

[0024] In a particular embodiment of the present invention, the fifth stress is adjustable by the first lever.

[0025] In a particular embodiment of the present invention, the prestressing means is configured to apply a sixth stress to the elongated flexible element, and the sixth stress is applied at the location where the second stress and the fourth stress are applied by any one of the second tensile / compressive force F L2 , or the second force F in a substantially orthogonal direction T2 , or the second torque M2.

[0026] In a particular embodiment of the present invention, the sixth stress is adjustable by the second lever.

[0027] In a particular embodiment of the present invention, the longitudinal flexible element is a unique flexible blade.

[0028] In a particular embodiment of the present invention, the elongated flexible element is arranged in the radial direction of the spiral spring.

[0029] In a particular embodiment of the present invention, the first lever and the second lever are flexible.

[0030] In a particular embodiment of the present invention, the first lever and the second lever are at least partially wound elongated members.

[0031] In certain embodiments of the present invention, the first lever and the second lever have a first free end, and the first free end can be actuated by the movement of the first free end, whereby the stress is exerted on the elongated flexible element.

[0032] In certain embodiments of the present invention, the second lever has a second free end, and the second free end can be actuated by the movement of the second free end, whereby the stress is exerted on the elongated flexible element.

[0033] In certain embodiments of the present invention, an appendix is provided at the end of the elongated member, and the prestressing means and the elongated flexible element are attached to the appendix.

[0034] In certain embodiments of the present invention, the longitudinal force and, optionally, the torque are continuously adjustable by the prestressing means.

[0035] In certain embodiments of the present invention, the flexible element is disposed at the outer end of the elongated member.

[0036] In certain embodiments of the present invention, the end of the elongated member is more rigid than the elongated flexible element and the elongated member.

[0037] In certain embodiments of the present invention, the elongated flexible element and the lever are disposed at the outer end of the elongated member.

[0038] In certain embodiments of the present invention, the elongated flexible element has a flexible neck portion (neck).

[0039] In certain embodiments of the present invention, the first lever and the second lever are configured to enable adjustment of the stress having different intensities.

[0040] In certain embodiments of the present invention, the first lever and the second lever have different cross-sections or rigidities from each other.

[0041] The present invention further relates to a rotary resonator mechanism, particularly for a timepiece movement, comprising a pendulum weight and a spiral spring as described above.

[0042] The objects, advantages, and features of the present invention will become apparent by reading the following several embodiments, which are given by way of example only, with reference to the accompanying drawings.

Brief Description of the Drawings

[0043]

Figure 1

Figure 2

Modes for Carrying Out the Invention

[0044] FIG. 1 shows a schematic view of one embodiment of a spiral spring 1, particularly for a resonator mechanism for a timepiece. In this case, the spiral spring 1 extends substantially in the same plane. The spiral spring 1 includes a flexible elongated member 2 that forms a plurality of turns wound around itself, and this elongated member 2 has a predetermined rigidity. The spiral spring 1 includes an adjusting means for adjusting its rigidity. In particular, for example, when the spiral spring 1 is attached to a plate (not shown) of a timepiece movement, the adjusting means can be actuated.

[0045] According to the present invention, the adjusting means includes an elongated flexible element 5 extending in the longitudinal direction, which is arranged in series with the elongated member 2, and this flexible element 5 connects one end 4 of the elongated member 2 to a fixed support 11. That is, the elongated member 2 is connected to the fixed support 11 only by this flexible element 5.

[0046] The flexible element 5 is fixed to one of the ends 4 of the elongate member 2. The embodiment described below comprises a flexible element 5 fixed to the outer end 4 of the elongate member 2. The inner end 19 of the elongate member 2 is intended to be assembled to the support 3 of the pendulum of the resonator 1.

[0047] The flexible element 5 adds additional rigidity to the rigidity of the elongate member 2. Preferably, the flexible element 5 has a rigidity greater than that of the elongate member 2. Here, the flexible element 5 is arranged on the straight line of the elongate member 2. Preferably, the adjusting means 5 and the elongate member 2 are integrally made and are formed of the same material in some cases.

[0048] Also, here, the end of the elongate member 2 is bent vertically so as to form an appendix 9. The appendix 9 functions as an attachment point and enables it to receive stress. Preferably, the appendix 9 has high rigidity, that is, higher rigidity than the elongate member 2 and / or the elongate flexible element 5, thereby minimizing the influence of the appendix 9 on the rigidity of the elongate member 2.

[0049] Preferably, the longitudinally flexible element 5 is a unique flexible blade 13, 15 that connects the appendix 9 to the fixed supports 11, 14.

[0050] The unique flexible blade 13 is arranged on the straight line of the appendix 9. The unique flexible blade 13 is arranged in a direction perpendicular to the end of the elongate member 2.

[0051] Therefore, the unique flexible blade 13 is arranged radially so as to preferably pass through the center of the spiral spring 1 when the spiral spring 1 is in a rest state.

[0052] The spiral spring 1 further comprises a prestressing means 6 for exerting at least two different stresses, namely a first stress and a second stress, on the flexible element 5.

[0053] The first stress is exerted by either a first tensile / compressive force F that is substantially directed along the longitudinal direction of the elongated flexible element, or a first force F that is substantially directed in a direction substantially orthogonal to the longitudinal direction of the elongated flexible element, or a first torque M1, which is preferably a bending moment, and thereby changes the rigidity of the elongated flexible element according to the level of the pre-stress. L1 or a first force F that is substantially directed in a direction substantially orthogonal to the longitudinal direction of the elongated flexible element T1 or a first torque M1, which is preferably a bending moment, and thereby changes the rigidity of the elongated flexible element according to the level of the pre-stress.

[0054] The second stress is exerted by either a second tensile / compressive force F that is substantially directed along the longitudinal direction of the elongated flexible element, or a second force F that is substantially directed in a direction substantially orthogonal to the longitudinal direction of the elongated flexible element, or a second torque M2, which is preferably a bending moment, and thereby changes the rigidity of the elongated flexible element according to the level of the pre-stress. L2 or a second force F that is substantially directed in a direction substantially orthogonal to the longitudinal direction of the elongated flexible element T2 or a second torque M2, which is preferably a bending moment, and thereby changes the rigidity of the elongated flexible element according to the level of the pre-stress.

[0055] In this embodiment, the first stress is the first longitudinal tensile-compressive force F L1 and the second stress is the second force F in the orthogonal direction T2 and these are variable. Preferably, these two forces are in the plane of the spiral spring 1. Thus, the rigidity of the spiral spring 1 can be precisely adjusted, particularly to improve the accuracy of the running of the movement.

[0056] The pre-stress means 6 enables the flexible element 5 to receive a compressive or tensile stress depending on the value of the force. In this way, the rigidity of the flexible element 5 changes.

[0057] Only the flexible element 5 is acted upon so as to change its rigidity without directly acting on the elongated member 2. Thus, higher accuracy can be obtained because a single element is used to adjust the rigidity. During vibration, the end 4 of the elongated member 2 can be movable.

[0058] Also, the longitudinal forces F L1 F L2and the force F in the orthogonal direction T1 , F T2 Stresses such as this can be continuously adjusted by the prestressing means 6. That is, these forces are not limited to discrete values. Therefore, the rigidity of the flexible element 5 can be adjusted with high precision.

[0059] The prestressing means 6 comprises a first lever 8 attached to the outer end 4 of the elongate member 2. The first lever 8 is bent and surrounds a part of the coiled elongate member 2. The first lever 8 is in the shape of a quasi-circle or in the shape of an arc with a central angle close to 180° and is attached to the appendix 9 at the end 4 of the elongate member 2.

[0060] The first lever 8 further has a first free end 12, and this first free end 12 can be actuated by the movement of this first free end 12 to exert the said stress. Preferably, the first lever 8 is flexible. The first free end 12 is arranged on the side opposite to the appendix 9. Preferably, the first lever 8 is arranged in the plane of the spiral spring 1. In this way, the first lever 8 makes it possible to adjust the first stress.

[0061] The prestressing means 6 comprises a second lever 15 attached to the outer end 4 of the elongate member 2. This second lever 15 is bent and preferably surrounds a part of the coiled elongate member 2 on the other side of the elongate member 2 with respect to the first lever 8. The second lever 15 is in the shape of a quasi-circle or in the shape of an arc with a central angle close to 90° and is attached to the appendix 9 at the end 4 of the elongate member 2.

[0062] The second lever 15 further has a second free end 16, and this second free end 16 can be actuated by the movement of the said first free end 12 to exert the said stress. The second free end 16 is arranged on the side opposite to the appendix 9.

[0063] Preferably, the second lever 15 is flexible. Preferably, the second lever 15 is arranged within the plane of the spiral spring 1. In this way, the second lever 15 enables adjustment of the second stress. Thus, the first lever 8 and the second lever 15 are joined together and attached to the same appendix 9 of the bent portion of the end 4 of the elongate member 2.

[0064] The first lever 8 enables adjustment of the first stress, and the second lever 15 enables adjustment of the second stress. Thus, these two stresses can be adjusted independently of each other.

[0065] Preferably, the prestressing means 6 is configured to exert other stresses on the elongate flexible element 5 using the first lever 8 and the second lever 15. Preferably, each lever 8, 15 exerts several stresses independent of each other, here three stresses, simultaneously.

[0066] The prestressing means 6 is configured to exert a third stress on the elongate flexible element. The third stress is where the first stress is exerted, the first tensile / compressive force F L1 , or the first force F in a substantially orthogonal direction T1 , or the first torque M1. In this embodiment, the third stress is the first force F in a substantially orthogonal direction T1 . Thanks to the first lever, the third stress is adjustable.

[0067] In this way, the first lever 8 enables adjustment of the first stress and the third stress simultaneously.

[0068] The prestressing means 6 is further configured to exert a fourth stress on the elongate flexible element 5, and this fourth stress is where the second stress is exerted, the second tensile / compressive force F L2 , or the second force F in a substantially orthogonal direction T2 , or the second torque M2. In this embodiment, the fourth stress is the second force F in a substantially longitudinal directionL2 That is. Thanks to the second lever, the fourth stress can be adjusted.

[0069] The pre-stress means 6 is further configured to exert a fifth stress on the elongated flexible element 5, and this fifth stress is applied where the first stress and the third stress are applied, with the first tensile / compressive force F L1 or the first force F in a substantially orthogonal direction T1 or the first torque M1.

[0070] In this embodiment, the fifth stress is the first torque M1. Thanks to the first lever 8, the fifth stress can be adjusted. Thanks to the first lever 8, the fifth stress can be adjusted.

[0071] The pre-stress means 6 is further configured to exert a sixth stress on the elongated flexible element 5, and this sixth stress is applied where the second stress and the fourth stress are applied, with the second tensile / compressive force F L2 or the second force F in a substantially orthogonal direction T2 or the second torque M2. In this embodiment, the sixth stress is the second torque M2. Thanks to the second lever 15, the second stress can be adjusted.

[0072] In this embodiment, the stresses generated by each of the levers 8 and 15 are in opposite directions, except for the longitudinal forces F L1 F L2 that are in the same direction. However, the first lever 8 and the second lever 15 have a similar effect on the rigidity of the elongated flexible element 5. The more the levers 8 and 15 are moved, the greater the rigidity of the elongated flexible element 5.

[0073] Since each lever exerts at least two stresses, it is possible to individually change the rigidity of the elongated flexible element 5.

[0074] Preferably, the first lever 8 and the second lever 15 are configured to enable adjustment of stresses having different intensities exerted as described above. In this way, one lever enables adjustment in a wider setting range, and the other lever enables adjustment in a finer setting range.

[0075] To obtain a difference in the setting strength of the rigidity of the elongate flexible element 5 between these two levers 8, 15, the cross-sections of these two levers 8, 15 are selected to be different, for example, or the rigidity of each lever 8, 15 is selected to be different.

[0076] Accordingly, the force or torque exerted is smaller if the cross-section or rigidity is smaller compared to the case where the cross-section or rigidity is larger, whereby the two levers 8, 15 are able to change the rigidity of the elongate flexible element 5 at two different scales.

[0077] Such levers 8, 15 make it possible to maintain the small size of the spiral spring 1, the dimensions of which are limited so as to be insertable into a timepiece movement.

[0078] In fact, the pre-stressing means 6 has a shape that matches the elongate member 2, thereby maintaining a sufficiently small size. This is because each part of the pre-stressing means 6 is close to the elongate member 2. Thus, it is only rarely that the spiral spring 1 is changed by the pre-stressing means. In this way, the spiral spring 1 is sufficiently small so as to be easily insertable into the movement.

[0079] As shown in FIG. 2, by actuating the first lever 8, a longitudinal force F directed towards the longitudinal axis of the longitudinal flexible element 5 is generated at the end 4 of the elongate member 2. L1 And an orthogonal force F directed in the orthogonal direction. T1 By actuating the first lever 8, furthermore, a torque or bending moment M1, indicated by the curved arrow, is generated in the specific blade 5.

[0080] By actuating the second lever 15, the longitudinal force F L1 and the longitudinal force F having the same orientation as that L2 , the orthogonal force F T1 and the orthogonal force F oriented on the side opposite to that T2 of the torque M1, and a torque M2 in the direction opposite to the torque M1, are generated.

[0081] In this way, the rigidity of the unique flexible blade 13, and thus the rigidity of the combination including the elongate member 2 and the unique flexible blade 13, changes.

[0082] The longitudinal forces F L1 , F L2 and the orthogonal forces F T1 , F T2 , and the torques M1, M2 change due to the movement of the first free end 12 of the first lever 8 and due to the movement of the second free end 16 of the second lever 15. Preferably, the first free end 12 and the second free end 16 are rigid bodies in order to facilitate their actuation. In this way, the rigidity of the flexible element 5, and thus the rigidity of the combination including the flexible element 5 and the elongate member 2, changes.

[0083] The present invention further relates to a timepiece movement comprising such a spiral spring 1. In particular, the spiral spring is used to actuate the movement of the balance.

[0084] Of course, the present invention is not limited to the embodiments described with reference to the drawings, and variations can be considered without departing from the scope of the present invention.

[0085] With respect to the longitudinal element, the flexible blades described in connection with several different embodiments of the spiral spring can be continuous flexible blades generally corresponding to the case of the drawings, and can also be blades having a highly rigid cross-section and a flexible neck portion connecting the cross-sections.

[0086] Also, the unique flexible blade can be oriented in a direction other than the radial or orthogonal direction with respect to the spiral spring. Therefore, it can be oriented in any direction between the radial direction and the orthogonal direction.

Description of Signs

[0087] 2 Elongated member 3 Support for the pendulum 4, 19 Ends of the elongated member 5 Elongated flexible element 6 Prestressing means 8 First lever 9 Appendix 11 Fixed support 12 First free end 13 Unique flexible blade 15 Second lever 16 Second free end

Claims

1. A spiral spring for a resonator mechanism of a timer, wherein the spiral spring (1) comprises a flexible elongate member (2) forming a plurality of turns wound around itself, the elongate member (2) has a predetermined rigidity, the spiral spring (1) comprises adjusting means for adjusting its rigidity, the adjusting means comprises an elongate flexible element (5) arranged in series with the elongate member (2), the elongate flexible element (5) connects one end (4, 19) of the elongate member (2) to a fixed support (11) to add additional rigidity to the elongate member (2), the elongate flexible element (5) has a higher rigidity than the rigidity of the elongate member (2), the adjusting means comprises prestressing means (6) for exerting at least two different stresses, the prestressing means (6) is attached to the end (4, 19) of the elongate member (2) and comprises a first lever (8) enabling adjustment of a first stress, the prestressing means (6) is attached to the end (4, 19) of the elongate member (2) and comprises a second lever (15) enabling adjustment of a second stress independently of the first stress, one of the first stress and the second stress is a force or torque directed in the longitudinal direction of the elongate flexible element (5), and the other is a force or torque directed in a direction orthogonal to the longitudinal direction of the elongate flexible element (5). A spiral spring characterized by the above.

2. The first stress is caused by any one of a first tensile / compressive force F directed in the longitudinal direction of the elongated flexible element (5), L1 or a first force F directed in a direction orthogonal to the longitudinal direction of the elongated flexible element (5), T1 or a first torque M which is a bending moment. 1 ​ Thereby changing the rigidity of the elongate flexible element (5) according to the level of prestress. The spiral spring according to claim 1, characterized by the above.

3. The second stress is a second tensile / compressive force F directed in the longitudinal direction of the elongated flexible element (5), L2 or a second force F directed in a direction orthogonal to the longitudinal direction of the elongated flexible element (5), T2 or a second torque M which is a bending moment, 2 and is exerted by any one of them, Thereby changing the rigidity of the elongate flexible element (5) according to the level of prestress. The spiral spring according to claim 1, characterized by the above.

4. The prestressing means (6) is configured to exert a third stress on the elongate flexible element (5). The third stress is exerted by any one of the first tensile / compressive force F L1 or the first force F in the orthogonal direction T1 or the first torque M 1 where the first stress is exerted. The spiral spring according to claim 2, characterized by the above.

5. The third stress is adjustable by the first lever (8). The spiral spring according to claim 4, characterized by the above.

6. The prestressing means (6) is configured to exert a fourth stress on the elongate flexible element (5). The fourth stress is exerted by any one of the second tensile / compressive force F L2 , or the second force F in the orthogonal direction T2 , or the second torque M 2 . The spiral spring according to claim 3, characterized by the above.

7. The fourth stress is adjustable by the second lever (15). The spiral spring according to claim 6, characterized by the above.

8. The pre-stress means (6) is configured to apply a fifth stress to the elongated flexible element (5), The fifth stress is exerted by any one of the first tensile / compressive force F L1 or the first force F in the orthogonal direction T1 or the first torque M 1 at the location where the first stress is exerted. The scroll spring according to claim 2, wherein:

9. The fifth stress is adjustable by the first lever (8) The scroll spring according to claim 8, wherein:

10. The pre-stress means (6) is configured to apply a sixth stress to the elongated flexible element (5), The sixth stress is exerted by any one of the second stress and the fourth stress where the second tensile / compressive force F L2 , or the second force F in the orthogonal direction T2 , or the second torque M 2 . The scroll spring according to claim 6, wherein:

11. The sixth stress is adjustable by the second lever (15) The scroll spring according to claim 10, wherein:

12. The elongated flexible element (5) is a flexible blade (13) The scroll spring according to claim 1, wherein:

13. The elongated flexible element (5) is arranged in the radial direction of the scroll spring (1) The scroll spring according to claim 1, wherein:

14. The first lever (8) and the second lever (15) are flexible The scroll spring according to claim 1, wherein:

15. The first lever (8) has a first free end (12), and this first free end (12) is actuated by the movement of this first free end (12) to apply the stress to the elongated flexible element (5), The second lever (15) has a second free end (16), and this second free end (16) is actuated by the movement of the second free end (16) to apply the stress to the elongated flexible element (5). The scroll spring according to any one of claims 1 to 14, wherein:

16. The first lever (8) and the second lever (15) are configured to enable adjustment of the stress having different intensities The scroll spring according to claim 1, wherein:

17. The first lever (8) and the second lever (15) have different cross-sections or strengths from each other The scroll spring according to claim 16, wherein:

18. The stress is continuously adjustable by the pre-stress means (6) The scroll spring according to claim 1, wherein:

19. The elongated flexible element (5) and the levers (8, 15) are arranged at the outer end (4) of the elongated member (2) The spiral spring according to claim 1, characterized in that...

20. A rotary resonator mechanism for a timepiece movement provided with a balance weight, comprising the spiral spring according to claim 1 The rotary resonator mechanism is characterized in that...

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