Spiral spring for a timepiece resonator movement provided with means for adjusting the stiffness

Abstract

The invention relates to a spiral hairspring, in particular for a timepiece resonator mechanism, comprising a flexible strip wound in several turns on itself, the strip having a predefined stiffness, the spiral hairspring comprising means for adjusting its stiffness, the adjustment means comprising a unique elongated flexible element arranged in series with the strip, the elongated flexible element connecting one end of the strip to a fixed support in order to add an additional stiffness to the strip, the elongated flexible element preferably having a higher stiffness than the stiffness of the strip, the adjustment means comprising prestressing means to exert at least two different forces on the elongated flexible element, the prestressing means comprising a first rod attached to the end of the strip in order to allow adjusting the first force, the prestressing means comprising a second rod also attached to the end of the strip in order to be able to adjust the second force independently of the first force. The invention also relates to a timepiece resonator mechanism comprising such a spiral hairspring.

Description

Technical Field

[0001] This invention relates to a ressort-spiral for a watch resonator mechanism, the ressort-spiral having means for setting the stiffness of the ressort-spiral. The invention also relates to a watch resonator mechanism having such a ressort-spiral. Background Technology

[0002] Most modern mechanical watches feature a balance wheel and a Swiss-style escapement. The balance wheel forms the watch's time base; it is also known as a resonator.

[0003] The escapement mechanism then performs two main functions:

[0004] - Maintain the reciprocating motion of the resonator;

[0005] - Count these reciprocating motions.

[0006] To form a mechanical resonator, an inertial element, a guide element, and a resilient return element are necessary. Traditionally, a spiral hairspring is used as the resilient return element for the inertial element formed by the balance wheel. The balance wheel is rotatably guided by a pivot that rotates in a sliding bearing made of ruby.

[0007] In general, the balance wheel and hairspring should be adjustable to improve the accuracy of the watch. For this purpose, devices are used to adjust the stiffness of the hairspring, such as indexes to modify the effective length of the hairspring. Thus, its stiffness is modified to adjust the watch's running accuracy. However, the effectiveness of conventional indexes for adjusting operation remains limited, and they are not always effective for setting sufficiently precise intervals within a few seconds or tens of seconds per day.

[0008] For more precise adjustment of the operation, there exists a device that includes one or more screws arranged on the rim of the balance wheel. By acting on the screws, the inertia of the balance wheel is modified, which results in a modification of the balance wheel's operation.

[0009] However, this setup method is not easy to implement because it disrupts the balance of the balance wheel and still does not allow for a sufficiently fine setting for the oscillator to operate. Summary of the Invention

[0010] The object of the present invention is to overcome all or part of the aforementioned disadvantages by providing a spiral hairspring with an effective and precise adjustment device, which is particularly configured to set the operation of the timepiece by modifying the effective stiffness of the spiral.

[0011] Therefore, the present invention relates to a spiral hairspring, particularly for use in watch resonator mechanisms, comprising a flexible strip wound several times on itself, the strip having a predetermined stiffness, the spiral hairspring including a means for adjusting its stiffness, the adjusting means including a unique elongated flexible element arranged in series with the strip, the elongated flexible element connecting one end of the strip to a fixed support to add additional stiffness to the strip, the elongated flexible element preferably having a stiffness higher than that of the strip, the adjusting means including a prestressing device to apply at least two different forces on the elongated flexible element.

[0012] A significant feature of the invention is that the prestressing device includes a first rod attached to an end of the strip to allow adjustment of the first force, and the prestressing device includes a second rod also attached to an end of the strip to allow adjustment of the second force independently of the first force.

[0013] This invention allows modification of the stiffness of elongated flexible elements (such as flexible blades). In fact, the stiffness of an elongated flexible element changes when two forces are applied. With a single applied force, whether it is a force or a torque, the stiffness of the elongated flexible element remains the same. A total force is obtained by applying two perpendicular forces (longitudinal and orthogonal) on the blade, which causes a change in the stiffness of the elongated flexible element. Stiffness is also modified by force and torque. The combination of the two forces is necessary for the ability to modify the stiffness.

[0014] By applying force to the prestressing device, the intensity level of the load is adjusted, which leads to a modification of the stiffness of the assembly comprising the flexible element and the strip. In fact, the flexible element, arranged in series with the strip, provides additional stiffness, which, combined with the stiffness of the strip, adds to the overall stiffness. Therefore, when the prestressing device applies a variable force to the flexible element, it modifies the stiffness of the flexible element, and thus modifies the stiffness of the assembly comprising the strip and the flexible element without modifying the stiffness of the strip, even though the variable force is applied to the elongated flexible element.

[0015] In other words, a flexible element is placed in series with the strip between one end of the strip and a fixed support. This flexible element introduces adjustable additional stiffness between the strip and its attachment points, thus giving the resonator greater flexibility. Therefore, the effective stiffness of the resonator includes the stiffness of the strip and the stiffness of the flexible element. A variable force is applied to prestress the flexible element, preferably without prestressing the strip. By applying prestress to the flexible element, its stiffness changes, while the stiffness of the strip remains substantially constant. By changing the stiffness of the flexible element, the stiffness of the resonator (both the stiffness of the strip and the flexible element) changes, which thus modifies the operation of the resonator.

[0016] Therefore, modifying the stiffness of the flexible element modifies the stiffness of the entire resonator, and thus finely sets its operation, allowing for precise adjustment of the time base frequency. This results in high accuracy in operating settings, achieved by precisely adjusting the stiffness of the spiral spring through a single, additional element.

[0017] Furthermore, each of the two bars allows for independent prestressing settings, resulting in more precise settings. Additionally, if the bars are different, two different strength settings are obtained.

[0018] According to a specific embodiment of the invention, the first force is provided either by a first tensile / compressive force substantially oriented in the longitudinal direction of the elongated flexible element, or by a first force substantially oriented in a direction substantially orthogonal to the longitudinal direction of the elongated flexible element, or by a first torque (preferably a bending moment), so that the stiffness of the elongated flexible element varies according to the prestress level.

[0019] According to a specific embodiment of the invention, the second force is provided either by a second tensile / compressive force substantially oriented in the longitudinal direction of the elongated flexible element, or by a second force substantially oriented in a direction substantially orthogonal to the longitudinal direction of the elongated flexible element, or by a second torque (preferably a bending moment), so that the stiffness of the elongated flexible element varies according to the prestress level.

[0020] According to a specific embodiment of the invention, the prestressing device is configured to apply a third force to the elongated flexible element, which is provided either at the location of the first force or by a force substantially orthogonal to the longitudinal direction of the elongated flexible element, or by a torque (preferably a bending moment).

[0021] According to a specific embodiment of the invention, the prestressing device is configured to apply a third force to the elongated flexible element, which is provided accordingly at the first force either by a first tensile / compressive force, or by a substantially orthogonal first force, or by a first torque. According to a specific embodiment of the invention, the third force is adjustable via a first rod.

[0022] According to a specific embodiment of the invention, the third force is adjustable via the first rod.

[0023] According to a specific embodiment of the invention, the prestressing device is configured to apply a fourth force to the elongated flexible element, which is provided accordingly at the second force either by a second tensile / compressive force, or by a substantially orthogonal second force, or by a second torque.

[0024] According to a specific embodiment of the invention, the fourth force is adjustable via the second rod.

[0025] According to a specific embodiment of the invention, the prestressing device is configured to apply a fifth force to an elongated flexible element, which is provided accordingly at the first and third forces, either by a first tensile / compressive force, or by a substantially orthogonal first force, or by a first torque.

[0026] According to a specific embodiment of the invention, the fifth force is adjustable via the first lever.

[0027] According to a specific embodiment of the invention, the prestressing device is configured to apply a sixth force to the elongated flexible element, which is provided accordingly at the second and fourth forces, either by a second tensile / compressive force, or by a substantially orthogonal second force, or by a second torque.

[0028] According to a specific embodiment of the invention, the sixth force is adjustable via the second rod.

[0029] According to a specific embodiment of the invention, the longitudinal flexible element is a unique flexible blade.

[0030] According to a specific embodiment of the invention, the flexible element is arranged in the radial direction of the spiral hairspring.

[0031] According to a specific embodiment of the invention, the first and second rods are flexible.

[0032] According to a specific embodiment of the invention, the first and second rods are curved and at least partially wrapped around the coiled strip.

[0033] According to a specific embodiment of the invention, the first rod and the second rod include a first free end that can be actuated by movement of the first free end in order to apply the force to the elongated flexible element.

[0034] According to a specific embodiment of the invention, the second rod includes a second free end that can be actuated by movement of the second free end in order to apply the force to the elongated flexible element.

[0035] According to a specific embodiment of the invention, the end of the strip includes an attachment, to which a prestressing device and an elongated flexible element are attached.

[0036] According to a specific embodiment of the invention, the longitudinal forces (multiple) and possible torques are continuously adjustable via a prestressing device.

[0037] According to a specific embodiment of the invention, the flexible element is arranged at the outer end of the strip.

[0038] According to a specific embodiment of the invention, the ends of the strip are more rigid than elongated flexible elements and strips.

[0039] According to a specific embodiment of the invention, elongated flexible elements and rods are arranged at the outer ends of the strip.

[0040] According to a specific embodiment of the present invention, the elongated flexible element includes a flexible neck.

[0041] According to a specific embodiment of the invention, the first rod and the second rod are configured such that the forces(s) can be adjusted at different intensities.

[0042] According to a specific embodiment of the invention, the first rod and the second rod have different cross sections or stiffnesses from each other.

[0043] The present invention also relates to a rotating resonator mechanism, particularly for use in watch movements, comprising a balance wheel and a spiral hairspring. Attached Figure Description

[0044] The objects, advantages, and features of the invention will become apparent from the accompanying drawings and from reading several embodiments provided by way of non-limiting example only, wherein:

[0045] - Figure 1 A schematic top view of a spiral hairspring according to an embodiment of the present invention is shown, and

[0046] - Figure 2 An enlarged top view schematically illustrating the appendage and the force applied to the appendage according to a first embodiment of the present invention. Detailed Implementation

[0047] Figure 1 A schematic illustration of an embodiment of a spiral hairspring 1 is shown, which is particularly useful in watch resonator mechanisms. In this example, the spiral hairspring 1 extends substantially in the same plane. The spiral hairspring 1 includes a flexible strip 2 wound several times on itself, the strip 2 having a predetermined stiffness. The spiral hairspring 1 includes means for adjusting its stiffness. For example, the adjusting means can be actuated, particularly when the spiral hairspring 1 is mounted on a plate of a watch movement (not shown).

[0048] According to the present invention, the adjusting device includes a longitudinally extending elongated flexible element 5, which is arranged in series with the strip 2, and the flexible element 5 connects one end 4 of the strip 2 to the fixed support 11. In other words, the strip 2 is connected to the fixed support 11 only by the flexible element 5.

[0049] The flexible element 5 is fixed to one of the ends 4 of the strip 2. The embodiment described below includes the flexible element 5 fixed to the outer end 4 of the strip 2. The inner end 19 of the strip 2 is intended to be assembled to the support 3 of the pendulum hammer of the resonator 1.

[0050] The flexible element 5 adds additional stiffness to the strip 2. Preferably, the flexible element 5 has a greater stiffness than the strip 2. The flexible element 5 is arranged in the prolongation of the strip 2. Preferably, the adjusting device 5 and the strip 2 are made as one piece and can be formed from the same material.

[0051] Furthermore, the end of the strip 2 is bent vertically to form the attachment 9. The attachment 9 serves as an attachment point and allows for the reception of forces. Preferably, the attachment 9 is substantially rigid, i.e., at least more rigid than the strip 2 and / or the elongated flexible element 5, in order to minimize its influence on the stiffness of the strip 2.

[0052] Preferably, the longitudinal flexible element 5 is a unique flexible blade 13, 15 that connects the appendix 9 to the fixed support members 11, 14.

[0053] Unique flexible blades 13 are arranged in the extension of the accessory portion 9. The unique flexible blades 13 are arranged in a direction perpendicular to the end of the strip 2.

[0054] Therefore, in the resting position of the spiral hairspring 1, the unique flexible blades 13 are arranged in a radial direction, preferably through the center of the spiral hairspring 1.

[0055] The spiral hairspring 1 also includes a prestressing device 6 to apply at least two different forces to the flexible element 5: a first force and a second force.

[0056] The first force, or the first tensile / compressive force F, is basically oriented in the longitudinal direction of the elongated flexible element. L1 Or, through a first force F in a direction substantially orthogonal to the longitudinal direction of the elongated flexible element. T1 Alternatively, it can be provided by a first torque M1 (preferably a bending moment) so that the stiffness of the elongated flexible element varies according to the prestress level.

[0057] The second force, or the second tensile / compressive force F, which is substantially oriented in the longitudinal direction of the elongated flexible element, is applied. L2 Alternatively, a second force F, substantially orthogonal to the longitudinal direction of the elongated flexible element 5, may be applied. T2 Alternatively, it can be provided by a second torque M2 (preferably a bending moment) so that the stiffness of the elongated flexible element varies according to the prestress level.

[0058] In this embodiment, the first force is a first longitudinal tensile-compressive force F. L1 Furthermore, the second force is an orthogonal second force F. T2The force is variable. Preferably, the two forces lie within the plane of the spiral hairspring 1. Therefore, the stiffness of the spiral hairspring 1 can be finely adjusted, thereby improving the accuracy of the movement.

[0059] The prestressing device 6 enables the flexible element 5 to withstand compressive or tensile forces depending on the force value. Therefore, it causes the stiffness of the flexible element 5 to change.

[0060] The stiffness is modified only on the flexible element 5, not directly on the strip 2. Therefore, greater precision is achieved by using a single element to adjust the stiffness. During the oscillation, the end 4 of the strip 2 is movable.

[0061] In addition, such as longitudinal force F L1 F L2 and normal force F T1 F T2 The force applied can be continuously adjusted by the prestressing device 6. In other words, the force is not limited to discrete values. Therefore, the stiffness of the flexible element 5 can be adjusted with high precision.

[0062] The prestressing device 6 includes a first rod 8 attached to the outer end 4 of the strip 2. The first rod 8 is a curved portion that wraps around the coiled strip 2. The first rod 8 has a semi-circular shape or an arc shape with an angle of approximately 180° at the center, and the first rod 8 is attached to the appendage 9 of the end 4 of the strip 2.

[0063] The first lever 8 also includes a first free end 12, which is actuated by movement of the first free end 12 to apply the force. Preferably, the first lever 8 is flexible. The first free end 12 is arranged opposite to the accessory portion 9. Preferably, the first lever 8 is arranged in the plane of the spiral spring 1. Therefore, the first lever 8 allows adjustment of the first force.

[0064] The prestressing device 6 includes a second rod 15 attached to the outer end 4 of the strip 2. The second rod 15 is a curved portion that wraps around the coiled strip 2, and the second rod 15 is preferably on the opposite side of the strip 2 relative to the first rod 8. The second rod 15 has a semi-circular shape or an arcuate shape with an angle of approximately 90° at its center, and the second rod 15 is attached to the appendage 9 of the end 4 of the strip 2.

[0065] The second rod 15 also includes a second free end 16, which can be actuated by movement of the first free end 16 to apply the force. The second free end 16 is arranged opposite to the accessory portion 9.

[0066] Preferably, the second rod 16 is flexible. Preferably, the second rod 15 is arranged in the plane of the spiral spring 1. Therefore, the second rod 15 allows adjustment of the second force. Thus, the first rod 8 and the second rod 15 are connected together and attached to the same appendage 9 of the curved portion of the end 4 of the strip 2.

[0067] The first lever 8 allows adjustment of the first force, while the second lever 15 allows adjustment of the second force. Therefore, the two forces can be adjusted independently of each other.

[0068] Preferably, the prestressing device 6 is configured to apply additional forces to the elongated flexible element 5 by means of the first rod 8 and the second rod 15. Preferably, each rod 8, 15 applies several forces independently of each other, and here, three forces are applied simultaneously.

[0069] The prestressing device 6 is configured to apply a third force to the elongated flexible element. This third force is correspondingly applied at the location of the first force, or through the first tensile / compressive force F. L1 Or through the fundamentally orthogonal first force F T1 Alternatively, it can be provided via a first torque M1. In this embodiment, the third force is a substantially orthogonal first force F. T1 Because the first lever (8) allows for adjustment of the third force.

[0070] Therefore, the first lever 8 allows for simultaneous adjustment of the first and third forces.

[0071] The prestressing device 6 is also configured to apply a fourth force to the elongated flexible element 5, which is correspondingly applied at the location of the second force or through the second tensile / compressive force F. L1 Or through a fundamentally orthogonal second force F T2 Alternatively, it can be provided via a second torque M2. In this embodiment, the fourth force is a generally longitudinal second force F. L2 Because the second lever (15) allows for adjustment of the fourth force.

[0072] The prestressing device 6 is also configured to apply a fifth force to the elongated flexible element 5, the fifth force correspondingly at the first force and the third force or through the first tensile / compressive force F. L1 Or through the fundamentally orthogonal first force F T1 Or it can be provided through the first torque M1.

[0073] In this embodiment, the fifth force is the first torque M1. Due to the first lever 8, the fifth force is adjustable. The fifth force can be adjusted by the first lever 8.

[0074] The prestressing device 6 is also configured to apply a sixth force to the elongated flexible element 5, which is correspondingly applied at the second and fourth forces or through the second tensile / compressive force F. L2 Or through a fundamentally orthogonal second force F T2 Alternatively, it can be provided via a second torque M2. In this embodiment, the sixth force is the second torque M2. The second force can be adjusted by the second lever 15.

[0075] In this embodiment, the forces generated by each rod 8, 15 are opposite, and the longitudinal force F points in the same direction. L1 F L2 Except for that. However, the first rod 8 and the second rod 15 have a similar effect on the stiffness of the elongated flexible element 5. The more rods 8 and 15 are raised, the more the stiffness of the elongated flexible element 5 increases.

[0076] Each rod allows for individual modification of the stiffness of the elongated flexible element 5, as it provides at least two forces.

[0077] Preferably, the first lever 8 and the second lever 18 are configured such that the force applied by them can be adjusted with different intensities. Thus, one lever allows adjustment within a wider setting range, while the other allows adjustment within a finer setting range.

[0078] In order to obtain a difference in the stiffness of the elongated flexible element 5 in terms of strength between the two rods 8 and 15, the cross sections of the two rods 8 and 15 are selected to be different, for example, or the stiffness of each rod 8 and 15 is selected to be different.

[0079] Therefore, the force or torque applied through a smaller cross section or stiffness is lower than the force or torque applied through a larger cross section or stiffness, allowing the stiffness of the elongated flexible element 5 to be modified at two different scales by the two rods 8 and 15.

[0080] Such levers 8 and 15 allow the spiral hairspring 1 to maintain a reduced size, which is limited in order to allow it to be inserted into the watch movement.

[0081] In fact, the prestressing device 6 has a shape that matches the strip 2 in order to maintain a sufficiently small size, because each part of the prestressing device 6 is close to the strip 2. Therefore, the width of the spiral hairspring 1 is hardly modified by the prestressing device. Thus, the spiral hairspring 1 is compact enough to be easily inserted into the movement.

[0082] like Figure 2 As shown, the actuating first rod 8 generates a longitudinal force F at the end 4 of the strip 2, oriented according to the longitudinal axis of the longitudinal flexible element 5. L1 and the orthogonal force F oriented according to the orthogonal directionT1 The actuation of the first lever 8 also generates torque or bending moment M1 on the unique blade 5 (illustrated by a curved arrow).

[0083] The actuation of the second lever 15 generates a longitudinal force F L1 Longitudinal force F oriented in the same manner L2 and longitudinal force F T1 Relative directional orthogonal force F T2 And the torque M2 in the relative direction compared to the torque M1.

[0084] Therefore, the stiffness of the unique blade 13 is modified, and thus the stiffness of the group including the strip 2 and the unique flexible blade 13 is modified.

[0085] Longitudinal force F L1 F L2 and normal force F T1 F T2 The torques M1 and M2 change due to the movement of the first free end 12 of the first rod 8 and the movement of the second free end 16 of the second rod 15. Preferably, the first free end 12 and the second free end 16 are rigid to facilitate their actuation. Therefore, the stiffness of the flexible element 5 and thus the stiffness of the assembly comprising the flexible element 5 and the strip 2 changes.

[0086] The present invention also relates to watch movements comprising such a spiral hairspring 1. In particular, the spiral hairspring is used to actuate the movement of the balance wheel.

[0087] Of course, the present invention is not limited to the embodiments described with reference to the accompanying drawings, and variations may be considered without departing from the scope of the invention.

[0088] As for the longitudinal elements, the flexible blades described in different embodiments of the spiral hairspring can be continuous flexible blades, as generally seen in the figures; or blades having a rigid section and a flexible neck connecting that section.

[0089] Furthermore, the unique flexible blades can be oriented in directions other than radial and orthogonal relative to the spiral spring. Therefore, it can be oriented in any direction, including both radial and orthogonal directions.

Claims

1. A spiral hairspring (1) comprising a flexible strip (2) wound several turns thereon, the strip (2) having a predetermined stiffness, the spiral hairspring (1) comprising an adjustment device for adjusting its stiffness, the adjustment device comprising a unique elongated flexible element (5) arranged in series with the strip (2), the elongated flexible element (5) connecting one end of the strip (2) to a fixed support (11) to add additional stiffness to the strip (2), the adjustment device comprising a prestressing device (6) for applying at least two different forces on the elongated flexible element (5), characterized in that, The prestressing device (6) includes a first rod (8) attached to the end of the strip (2) to allow adjustment of the first force, and the prestressing device (6) includes a second rod (15) also attached to the end of the strip (2) to allow adjustment of the second force independently of the first force.

2. The spiral hairspring according to claim 1, characterized in that, The first force is either a first tensile / compressive force substantially oriented in the longitudinal direction of the elongated flexible element (5). F L1 Or by a first force substantially orthogonal to the longitudinal direction of the elongated flexible element (5). F T1 Or through the first torque M 1 Provided so that the stiffness of the elongated flexible element (5) varies according to the prestress level.

3. The spiral hairspring according to claim 1 or 2, characterized in that, The second force is either a second tensile / compressive force substantially oriented in the longitudinal direction of the elongated flexible element (5). F L2 Or by a second force substantially orthogonal to the longitudinal direction of the elongated flexible element (5). F T2 Or through a second torque M 2 Provided so that the stiffness of the elongated flexible element (5) varies according to the prestress level.

4. The spiral hairspring according to claim 2, characterized in that, The prestressing device (6) is configured to apply a third force to the elongated flexible element (5), the third force being correspondingly applied at the location of the first force or through the first tensile / compressive force. F L1 Or through the first force which is substantially orthogonal F T1 or through the first torque M 1 supply.

5. The spiral hairspring according to claim 4, characterized in that, The third force is adjustable via the first rod (8).

6. The spiral hairspring according to claim 3, characterized in that, The prestressing device (6) is configured to apply a fourth force to the elongated flexible element (5), the fourth force being correspondingly applied at the location of the second force or through the second tensile / compressive force. F L2 Or through the second force, which is essentially orthogonal. F T2 or through the second torque M 2 supply.

7. The spiral hairspring according to claim 6, characterized in that, The fourth force is adjustable via the second rod (15).

8. The spiral hairspring according to claim 4, characterized in that, The prestressing device (6) is configured to apply a fifth force to the elongated flexible element (5), the fifth force being correspondingly applied at the location of the first force and the third force, or through the first tensile / compressive force. F L1 Or through the first fundamentally orthogonal force F T1 or through the first torque M 1 supply.

9. The spiral hairspring according to claim 8, characterized in that, The fifth force is adjustable via the first rod (8).

10. The spiral hairspring according to claim 6, characterized in that, The prestressing device (6) is configured to apply a sixth force to the elongated flexible element (5), the sixth force being correspondingly located at the second force and the fourth force or through the second tensile / compressive force. F L2 Or through the second force, which is essentially orthogonal. F T2 or through the second torque M 2 supply.

11. The spiral hairspring according to claim 10, characterized in that, The sixth force is adjustable via the second rod (15).

12. The spiral hairspring according to claim 1 or 2, characterized in that, The elongated flexible element (5) is a unique flexible blade (13).

13. The spiral hairspring according to claim 1 or 2, characterized in that, The flexible element (5) is arranged in the radial direction of the spiral hairspring (1).

14. The spiral hairspring according to claim 1 or 2, characterized in that, The first rod (8) and the second rod (15) are flexible.

15. The spiral hairspring according to claim 1 or 2, characterized in that, The first rod (8) includes a first free end (12) actuated by movement of the first free end (12) to apply the force to the elongated flexible element (5), and the second rod (15) includes a second free end (16) actuated by movement of the second free end (16) to apply the force to the elongated flexible element (5).

16. The spiral hairspring according to claim 1 or 2, characterized in that, The first rod (8) and the second rod (15) are configured to allow the force to be adjusted at different intensities.

17. The spiral hairspring according to claim 16, characterized in that, The first rod (8) and the second rod (15) have different cross sections or stiffnesses.

18. The spiral hairspring according to claim 1 or 2, characterized in that, The first force and / or the second force are continuously adjustable by the prestressing device (6).

19. The spiral hairspring according to claim 1 or 2, characterized in that, The flexible element (5), the first rod (8), and the second rod (15) are arranged at the outer end (4) of the strip (2).

20. The spiral hairspring according to claim 1, characterized in that, The spiral hairspring is used in the clock resonator mechanism.

21. The spiral hairspring according to claim 1, characterized in that, The elongated flexible element (5) has a higher stiffness than the strip (2).

22. The spiral hairspring according to claim 2, characterized in that, The first torque is the bending moment.

23. The spiral hairspring according to claim 3, characterized in that, The second torque is the bending moment.

24. A rotary resonator mechanism, the rotary resonator mechanism comprising a pendulum hammer, wherein, The rotary resonator mechanism includes a spiral hairspring (1) according to any one of claims 1 to 23.

25. The rotary resonator mechanism according to claim 24, characterized in that, The rotary resonator mechanism is used in watch movements.

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