CH718124A2 - Hairspring for clock resonator mechanism provided with means for adjusting the rigidity. - Google Patents

Abstract

The invention relates to a balance-spring, in particular for a clock resonator mechanism, the balance-spring (90) extending substantially in one plane, the balance-spring (90) comprising a flexible strip (2) wound thereon -even according to several turns, the ribbon (2) having a predefined rigidity, the spiral spring (90) comprising means for adjusting its rigidity, characterized in that the adjustment means comprise a flexible element (5) in direct contact with the tape (2), the flexible element (5) preferably having a stiffness greater than that of the tape (2), the adjustment means comprising prestressing means (6) for applying a force or a torque variable on the flexible element (5) so as to vary the rigidity of the flexible element (5). The invention also relates to a clockwork resonator mechanism comprising such a hairspring.

Description

Technical field of the invention

The invention relates to a hairspring for a resonator clockwork mechanism, the hairspring being provided with means for adjusting the rigidity of said hairspring. The invention also relates to a clockwork resonator mechanism fitted with such a hairspring.

Technology background

[0002] Most current mechanical watches are fitted with a balance-spring and a Swiss lever escapement mechanism. The balance-spring constitutes the time base of the watch. It is also called resonator.

[0003] The escapement fulfills two main functions: maintaining the back and forth movements of the resonator; count these comings and goings.

[0004] To constitute a mechanical resonator, an inertial element, a guide and an elastic return element are required. Traditionally, a spiral spring acts as an elastic return element for the inertial element that constitutes a balance. This balance wheel is guided in rotation by pivots which rotate in smooth ruby bearings.

[0005] The balance spring-spring must generally be able to be adjusted in order to improve the precision of a watch. To this end, means for adjusting the rigidity of the hairspring, such as a racket, are used to modify the effective length of the spring. Thus, its rigidity is modified to adjust the running precision of the watch. However, the effect of a traditional racket for adjusting the rate remains limited, and it is not always effective in making the adjustment sufficiently precise, of the order of a few seconds or a few tens of seconds per day.

[0006] For finer rate adjustment, there are adjustment means comprising one or more screws arranged in the rim of the balance. By acting on the screws, the inertia of the balance wheel is modified, which has the effect of modifying its rate.

[0007] However, this mode of adjustment is not easy to perform, and still does not make it possible to obtain sufficient fineness of adjustment of the rate of the oscillator.

Summary of the invention

The object of the present invention is to overcome all or part of the aforementioned drawbacks by proposing a spiral spring provided with effective and precise adjustment means, configured in particular to adjust the rate of a timepiece by modifying the effective length of said hairspring.

[0009] To this end, the invention relates to a balance-spring for a clock resonator mechanism, the balance-spring extending substantially in one plane, the balance-spring comprising a flexible ribbon wound on itself according to several turns, the strip having a predefined rigidity, the hairspring comprising means for adjusting its rigidity.

The invention is remarkable in that the adjustment means comprise a flexible element in direct contact with the tape, so as to add additional rigidity to the tape, the flexible element preferably having a greater rigidity than that of the tape, the adjustment means comprising prestressing means for applying a variable force or torque to the flexible element so as to vary the rigidity of the flexible element.

Thanks to the invention, by acting on the prestressing means, the force or the torque applied to the flexible element is modified, which leads to a modification of the rigidity of the assembly comprising the flexible element and the ribbon. Indeed, the flexible element placed in series with the tape provides additional rigidity to the tape, which is added to that of the tape. Thus, when the prestressing means apply a variable force or torque to the flexible element, they modify the rigidity of the flexible element and therefore of the assembly comprising the tape.

According to a particular embodiment of the invention, the flexible element is arranged at an outer end of the tape.

According to a particular embodiment of the invention, the flexible element is arranged at an inner end of the tape.

According to a particular embodiment of the invention, the flexible element comprises a flexible neck.

According to a particular embodiment of the invention, the flexible element comprises a translation table provided with two substantially parallel flexible blades and a movable rigid part to which the tape is connected.

According to a particular embodiment of the invention, the flexible element comprises a flexible guide provided with two crossed blades and a movable rigid part to which the tape is connected.

According to a particular embodiment of the invention, the flexible element comprises a flexible guide provided with two uncrossed blades and a movable rigid part to which the tape is connected.

According to a particular embodiment of the invention, the flexible element comprises a flexible ring to which the tape is connected.

According to a particular embodiment of the invention, the flexible element comprises a flexible arm to which the ribbon is connected.

According to a particular embodiment of the invention, the flexible element comprises a plurality of rigid sections connected by strips or flexible necks.

According to a particular embodiment of the invention, the flexible element comprises a flexible blade.

According to a particular embodiment of the invention, the flexible element is connected on the other hand to a fixed support.

According to a particular embodiment of the invention, the prestressing means comprise a screw configured to bear against the flexible element.

According to a particular embodiment of the invention, the prestressing means comprise a first magnet secured to the flexible element and a second magnet movable relative to the first magnet.

[0025] According to a particular embodiment of the invention, the prestressing means comprise a spring and a movable element making it possible to stretch or compress the spring.

According to a particular embodiment of the invention, the spring comprises several substantially parallel flexible blades and another movable element.

According to a particular embodiment of the invention, the prestressing means comprise a secondary flexible strip connected to the flexible element.

According to a particular embodiment of the invention, the prestressing means comprise a lever.

The invention also relates to a rotary resonator mechanism, in particular for a watch movement, comprising an oscillating weight and such a hairspring.

Brief description of figures

The aims, advantages and characteristics of the present invention will appear on reading several embodiments given solely by way of non-limiting examples, with reference to the appended drawings in which: FIG. 1 schematically represents a top view of a flexible guide according to a first embodiment of the invention, FIG. 2 schematically represents a top view of a flexible guide according to a second embodiment of the invention, FIG. 3 schematically represents a top view of a flexible guide according to a third embodiment of the invention, FIG. 4 schematically represents a top view of a flexible guide according to a fourth embodiment of the invention, FIG. 5 schematically represents a top view of a flexible guide according to a fifth embodiment of the invention, FIG. 6 schematically represents a top view of a flexible guide according to a sixth embodiment of the invention, FIG. 7 schematically represents a top view of a flexible guide according to a seventh embodiment of the invention, FIG. 8 schematically represents a top view of a flexible guide according to an eighth embodiment of the invention, FIG. 9 schematically represents a top view of a flexible guide according to a ninth embodiment of the invention, FIG. 10 schematically represents a top view of a flexible guide according to a tenth embodiment of the invention, FIG. 11 schematically represents a top view of a flexible guide according to an eleventh embodiment of the invention, FIG. 12 schematically represents a top view of a flexible guide according to a twelfth embodiment of the invention, FIG. 13 schematically represents a top view of a flexible guide according to a thirteenth embodiment of the invention, FIG. 14 schematically represents a top view of a flexible guide according to a fourteenth embodiment of the invention, FIG. 15 schematically represents a top view of a flexible guide according to a fifteenth embodiment of the invention, FIG. 16 schematically represents a top view of a flexible guide according to a sixteenth embodiment of the invention, FIG. 17 schematically represents a top view of a flexible guide according to a seventeenth embodiment of the invention, FIG. 18 schematically represents a top view of a flexible guide according to an eighteenth embodiment of the invention, FIG. 19 schematically represents a top view of a flexible guide according to a nineteenth embodiment of the invention, FIG. 20 schematically represents a top view of a flexible guide according to a twentieth embodiment of the invention, FIG. 21 schematically represents a top view of a flexible guide according to a twenty-first embodiment of the invention, and FIG. 22 schematically represents a top view of a flexible guide according to a twenty-second embodiment of the invention, FIG. 23 schematically represents a top view of a flexible guide according to a twenty-third embodiment of the invention, FIG. 24 schematically represents a top view of a flexible guide according to a twenty-fourth embodiment of the invention, FIG. 25 schematically represents a top view of a flexible guide according to a twenty-fifth embodiment of the invention, FIG. 26 schematically represents a top view of a flexible guide according to a twenty-sixth embodiment of the invention, FIG. 27 schematically represents a top view of a flexible guide according to a twenty-seventh embodiment of the invention, FIG. 28 schematically represents a top view of a flexible guide according to a twenty-eighth embodiment of the invention.

Detailed description of the invention

Figures 1 to 28 each show a schematic representation of a different embodiment of a spiral spring 1, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, in particular for a clock resonator mechanism. The hairspring extends substantially in one plane. The spiral spring 1, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270 comprises a flexible ribbon 2 wound on itself in several turns, the ribbon 2 having a predefined rigidity. The spiral spring comprises means for adjusting its rigidity.

According to the invention, the adjustment means comprise a flexible element 5 in direct contact with the tape 2, and preferably integral with one of the ends 4, 9 of the tape 2. The flexible element 5 adds rigidity additional to that of the ribbon 2. The flexible element 5 preferably has a greater rigidity than that of the ribbon 2.

[0033] The spiral spring 1, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210 , 220, 230, 240, 250, 260, 270 further comprises prestressing means 6 for applying a variable force or torque to the flexible element 5. Thus, the rigidity of the spiral spring 1, 10, 20 can be adjusted , 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270 , in particular to improve the accuracy of the rate of the movement. The prestressing means 6 preferably allow the flexible element 5 to perform a movement in translation or in rotation in the plane of the spiral spring. Thus, the rigidity of the flexible element 5 is varied.

The embodiments described below comprise a flexible element 5 secured to the outer end 4 of the strip 2. The inner end 9 of the strip 2 is assembled to a support 3 of an oscillating mass of the resonator. According to variant embodiments, not shown in the figures, the flexible element is connected to the internal end 9 of the ribbon 2, so as to be in series between the ribbon 2 and the support 3 of the oscillating mass.

In the example of Figure 1, the flexible element 5 of the spiral spring 1 comprises elongated body 7 provided with a neck 8 thinned in the thickness of the material, the neck being flexible. Thus, the flexible element comprises a fixed support 14, for example joined to the main plate of the movement, and a movable part 15 joined to the outer end 4 of the strip 2, the fixed support 14 and the movable part 14 being connected by the neck 8. By applying a variable force or torque to the movable part 15, it moves relative to the fixed support 14. Thus, the rigidity of the flexible element 5e and therefore of the assembly comprising the ribbon 2 and the flexible element 5.

The second embodiment of the spiral spring 10 of Figure 2 shows a flexible element 5 comprising a flexible ring 12 joined to the outer end 4 of the tape 2. The flexible element 5 also comprises a fixed support 11 in T-shape, which is stationary with respect to motion. The ring 12 is also linked to the base 13 of the T. Thus, by applying a variable force or torque to the ring 12, it deforms relative to the fixed support 11, so that the rigidity of the the flexible element 5.

For the third embodiment of the spiral spring 20 of Figure 3, the flexible element 5 of the spiral spring comprises a flexible arm 16 and a fixed support 17 on which the arm 16 is attached cantilever . The outer end 4 of the tape 2 is attached to the end 18 of the arm 16 in its extension. Thus, by applying a variable force or torque to the arm 16, it deforms with respect to the fixed support 17, so as to modify the rigidity of the flexible element 5. In the figure, the variable force or torque is applied from preferably parallel to arm 16.

Figure 4 shows a spiral spring 30 whose flexible element 5 comprises a translation table. The translation table comprises at least one secondary flexible blade, here two secondary flexible blades 21, 22, and a rigid part 23. The flexible blades 21, 22 are joined by one end to the rigid part 23, and by another end to a fixed support 24. The secondary flexible blades 21, 22 are substantially parallel and are arranged on different lines. Preferably, the secondary flexible blades 21, 22 are joined to the same face 25 of the rigid part 23. The rigid part 23 has an elongated rectangular shape, on which the outer end 4 of the strip 2 is joined in its extension. The secondary flexible blades 21, 22 are substantially perpendicular to the rigid part 23 and to the outer end 4. In the figure, the variable force or torque is applied to the rigid part 23, preferably parallel to the blades 21, 22.

In Figure 5, the flexible element 5 of the spiral spring 40 comprises a pivot with crossed blades, the pivot comprising two crossed blades 27, 28, connected on the one hand to a fixed support 29 of the movement, and d on the other hand to a rigid movable part 31 of the pivot. The rigid part 31 has an elongated rectangular shape arranged perpendicular to the outer end 4 of the tape 2. The pivot with crossed blades 27, 28 is arranged so that the crossing of the blades is in the extension of the outer end 4 of the tape 2. In the figure, the variable force or torque is applied to the rigid part 31, preferably parallel to the axis of symmetry of the pivot with crossed blades and to the outer end 4 of the tape 2.

In the sixth embodiment of Figure 6, the flexible element 5 of the spiral spring 50 comprises a pivot with crossed blades, the pivot comprising two crossed blades 33, 34 joined at their intersection 35. The blades 33, 34 are linked on the one hand to a fixed support 38 of the movement, and on the other hand to a rigid part 37 in the shape of a T. The rod 39 of the T is joined to the outer end 4 of the ribbon, while the blades are joined to the bar 41 of the T. The pivot with crossed blades is arranged so that the crossing of the blades is in the extension of the outer end 4 of the strip 2. In the figure, the variable force or torque is applied to the bar 37 of the T of the rigid part 37, the pivot being arranged obliquely with respect to the tape 2.

For the seventh embodiment of Figure 7, the flexible element 5 of the hairspring 60 comprises a translation table arranged in the extension of the outer end 4 of the tape 2. The translation table comprises at least a secondary flexible blade, here two secondary flexible blades 42, 43, and a rigid part 45. The secondary flexible blades 42, 43 are joined by one end to the rigid part 45, and by another end to a fixed support 44 with respect to At the move. The secondary flexible blades 42, 43 are substantially parallel and are arranged on different lines. Preferably, the secondary flexible blades 42, 43 are joined to the same face of the rigid part 45. The rigid part 45 has an elongated rectangular shape, on which the outer end 4 of the tape 2 is joined perpendicularly cantilevered. fake. The secondary flexible blades 42, 43 are substantially parallel to the outer end 4 and perpendicular to the rigid part 45. In the figure, the variable force or torque is applied to the rigid part 45, in the direction of the secondary blades 42, 43. Thanks to the bending of the secondary flexible blades 42, 43, the rigid part 45 can move parallel to the fixed support 44. By pulling the outer end 4 of the tape 2, the movement of the rigid part 45 varies the rigidity of the flexible element 5.

The eighth embodiment of the hairspring 70 of Figure 8 comprises a flexible element 5 identical to that of the seventh embodiment of Figure 7. The hairspring further comprises preloading means 6 of the flexible element 5. The prestressing means 6 comprise magnets 47, 48, a first magnet 47 being arranged on the rigid part 45 of the translation table, and a second magnet 48 being arranged to move relative to the first magnet 47. Thus, the magnets 47, 48 attract or repel each other depending on their polarities, so that a force is applied to the rigid part 45. The second magnet 48 is for example arranged on a movable element relative to the translation table .

In the ninth embodiment of Figure 9, the flexible element 5 of the spiral spring comprises a pivot with uncrossed flexible blades. The pivot comprises two uncrossed flexible blades 51, 52 and a rigid part 54. The flexible blades 51, 52 are joined, on the one hand laterally to an elongated fixed support 53, and on the other hand to the rigid part 54. The part rigid 54 has a circular shape with a smaller diameter than the fixed support 53. Thus, preferably, the flexible blades 51, 52 approach from the fixed support 53 to the rigid part 54. The outer end 4 of the ribbon is joined to the rigid part 54. In the figure, the variable force or torque is applied to the rigid part 45, obliquely with respect to the pivot. Preferably, the force is parallel to the axis of symmetry of the flexible leaf pivot.

Figures 10 to 20 are embodiments of spiral springs 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190 comprising a flexible element 5 identical to that of the ninth mode of realization, but each having 6 different prestressing means. These prestressing means 6 are of course adaptable to other embodiments of spiral springs with flexible elements 5 different from that of the ninth embodiment.

The tenth embodiment of Figure 10 comprises a screw 55 as prestressing means 6. The screw 55 is positioned obliquely against the rigid part 54 of the pivot, preferably parallel to the axis of symmetry of the pivot. Thus, by actuating the screw by screwing or unscrewing, the latter applies a variable force or torque to the rigid part 54, which moves relative to the fixed support 53, in particular in order to adjust the rigidity of the flexible element 5 .

In Figure 11, the prestressing means 6 comprise magnets 57, 58, a first magnet 57 being arranged on the rigid part 54, while a second magnet 58 is movable relative to the rigid part 54, so to exert a variable force or torque on the rigid part 54. The variable force or torque is exerted obliquely on the rigid part 54 in order to adjust the rigidity of the flexible element 5.

The prestressing means 6 of the twelfth embodiment of Figure 12 comprise a spring 55 and a movable element 59. The spring 55 is joined to the rigid part 54 of the pivot on the one hand, and to the movable element 59 on the other hand. Thus, by moving the movable element 59, the spring applies a variable force or torque to the rigid part in order to adjust the rigidity of the flexible element 5.

The thirteenth embodiment of Figure 13 shows a variant of the embodiment of the spiral spring 110 of Figure 12, in which a secondary flexible blade 61 is arranged in series between the spring 55 and the rigid part 54 of the pivot. To this end, the prestressing means 6 are provided with a second movable element 62 to which are connected the spring 55 on one side, and the secondary flexible blade 61 on the other side. The secondary flexible blade 61 is linked to the second mobile element 62 and to the rigid part 54. By acting on the first mobile element 59, the variable force or torque acting on the rigid part of the pivot via the second element is modified. mobile 62 and the secondary flexible blade 61.

In Figure 14, the hairspring 130 is similar to that of Figure 13, the hairspring 130 comprising prestressing means 6 provided with a secondary flexible blade 63 with a rigid section 64 in the middle of the secondary flexible blade 63.

In the fifteenth embodiment of the spiral spring 140 of Figure 15, the prestressing means 6 comprise, instead of the secondary flexible blade of the two previous embodiments, an elongated part 65 provided with at least a flexible neck, here two flexible necks 66, 67. The part 65 comprises a rigid central section 69 and a flexible neck 66, 67 at each end.

The sixteenth and seventeenth embodiments of Figures 16 and 17 show the same prestressing means 6 oriented differently in the two figures. The prestressing means 6 comprise a spring formed from flexible blades. A secondary flexible blade connects the rigid part of the flexible element to a first rigid body 71 in the form of an elbow.

The prestressing means 6 comprise a second rigid body 75 in the form of an elbow, as well as tertiary blades 72 connecting the two rigid bodies 71, 75. The two rigid bodies 71, 75 are mobile and have substantially parallel segments two two in the rest position of the prestressing means 6. The four tertiary blades 72 are substantially perpendicular to the secondary blade 61 in the rest position of the prestressing means 6. The prestressing means 6 further comprise two quaternary blades 74 connecting the second body 75 to a fixed support 73. The quaternary blades 74 are substantially parallel to the tertiary blades 72 and arranged on the same side of the second rigid body 75. By applying a variable force or torque to the second rigid body 75, the rigidity of the flexible element 5 is varied.

In Figure 16, the prestressing means 6 are arranged in the axis of the flexible element 5, while in Figure 17, the prestressing means 6 are arranged obliquely relative to the flexible element 5.

The eighteenth embodiment of Figure 18 of the spiral spring 170 is similar to that of the seventeenth embodiment, except for the support 77 which is connected to the first movable body 71 by the quaternary blades 78, and not to the second moving body 76.

Figure 19 shows prestressing means 6 similar to those of Figure 17, to which a lever 81 has been added. 83 rigid. The five-year flexible blade 82 is substantially parallel to the secondary blade 61 in the rest position of the prestressing means 6. The lever 81 is arranged perpendicular to the five-year flexible blade 82. The lever is also connected to a second support 87 fixed by two quinquennial blades 84, 85 arranged on either side of the lever 81. The free end 86 of the lever is U-shaped, on which one can act by actuating it laterally, in order to apply a variable force or torque on the flexible element 5.

In Figure 20, the prestressing means 6 comprise a lever 89 connected to the flexible element 5 by a spring 88, which may be helical or formed of a flat coil. The spring is connected to the rigid part 54 of the flexible element 5 on the one hand, and to the lever 89 on the other hand. The lever 89 can pivot around a fixed axis 91 passing through it at the end 92 connected to the spring. Thus, by moving the lever 89 laterally, the variable torque or the force exerted on the flexible element 5 is modified.

The twentieth-and-first embodiment of the spiral spring 200 of Figure 21 comprises a flexible element 5 provided with a plurality of rigid sections 93, 94, 95, 96 joined by small flexible blades 97. rest position the sections 93, 94, 95, 96 and the small flexible blades 97 are arranged on a line 98. In the figure, the flexible element 5 comprises four sections 93, 94, 95, 96 elongated in series and three small blades 97 connecting them. The first section 93 is a fixed support, while the other sections 94, 95, 96 are mobile. The outer end 4 of the strip 2 is joined to the second section 94, the second section 94 comprising a lateral lug 99 to which the strip 2 is bound.

The prestressing means 6 comprise a rigid body 75 in the shape of an elbow, as well as secondary blades 72 connecting the rigid body 75 to the fourth section 96. The four secondary blades 72 are substantially perpendicular to the line 98 in the rest position prestressing means. The prestressing means 6 further comprise two tertiary blades 74 connecting the rigid body 75 to a fixed support 73. The tertiary blades 74 are substantially parallel to the secondary blades 72 in the rest position of the prestressing means 6. By applying a force or a variable torque on the rigid body 75, the rigidity of the flexible element 5 is varied.

In the twenty-second embodiment of Figure 22, the spiral spring 210 is substantially the same as that of Figure 21, the rigid sections 93, 94, 95, 96 being connected by flexible necks 101 to the place of the small blades 97 of FIG. 21. A collar 101 is an element of flexible thinned material.

The embodiments of Figures 23 to 25 of the spiral spring 220, 230, 240 each comprise a flexible element 5 such as that of Figures 9 to 20, that is to say a pivot provided with two flexible blades uncrossed 51, 52 and a rigid part 104. The rigid part 104 further comprises a lug 105 at right angle to which is joined the ending part 4 of the tape 2. The prestressing means 6 comprise a secondary flexible blade 61 joined at one end 108 on the circular part of the rigid part 104, preferably in the axis of symmetry of the pivot. The prestressing means 6 further comprise a lever 106 joined to the opposite end 109 of the secondary blade 61. The lever 106 is preferably curved to circumvent the tape 2 wound. The force or torque is applied at its free end 107 parallel to the secondary blade 61.

In the embodiment of Figure 24, the prestressing means 6 of the spiral spring 220 further comprise two tertiary blades 111, 112 substantially parallel. The tertiary blades 111, 112 are joined on the one hand to the lever 106, at the level of the connection to the secondary blade 61. The tertiary blades 111, 112 are connected on the other hand to a fixed support 113.

The spiral spring 240 of Figure 25 describes prestressing means provided with tertiary blades 114, 115 uncrossed, which are joined to a fixed support 116 on the one hand, and to the lever 106 on the other hand. The tertiary blades 114, 115 come together towards the lever 106 and are arranged in the curvature of the lever 106, being further from the connection with the secondary blade 61.

The spiral spring embodiments 250, 260, 270 of Figures 26 to 28 describe a flexible element 5 comprising a first flexible blade 119 and a rigid part 118, here rectangular, connected to the first flexible blade 119 and to the external end 4 of the tape 2, preferably on the same side of the rigid part 118. The first flexible blade 119 is connected on the other hand to a fixed support 117. The prestressing means 6 comprise a secondary flexible blade 122, 128 shorter, arranged on an opposite face of the rigid part 118 in the axis of the first flexible blade 119.

In Figure 26, the secondary flexible blade 122 is connected to a second rigid part 121 of the prestressing means 6. The force or the torque is exerted on the second rigid part 121 in the direction of the first flexible blades 119 and secondary 122.

In the embodiment of Figure 27, the secondary flexible blade 122 is connected to a curved lever 124 bypassing the ribbon 2 wound. A tertiary flexible blade 123 connects the lever 124 to a fixed support 126, in the curvature of the lever 124. The force or the torque is exerted on the free end 125 of the lever 124, preferably parallel to the first flexible blades 119 and secondary 122 .

Figure 28 shows a final embodiment in which the secondary flexible blade 128 is bent and connected at the other end to a curved lever 124 bypassing the tape 2 wound. The lever 124 is connected, in addition to the bent blade 128, to a semi-rigid structure 127 connected to the fixed support 117. The semi-rigid structure 127 partially deforms when the lever 124 is actuated by force or torque. The force or torque is exerted on the free end 125 of the lever.

[0067] The flexible blades described in the different embodiments of the spiral spring can be continuous flexible blades, as is generally the case in the figures, or else blades with rigid sections and flexible necks connecting the sections. .

The invention also relates to a rotary resonator mechanism, in particular for a watch movement. The resonator mechanism comprises an oscillating weight, not shown in the figures, and a hairspring as described above. The oscillating mass is for example an annular balance. The oscillating weight is joined to the spiral spring to be integral with the support 3.

Claims (19)

1. Hairspring, in particular for a clockwork resonator mechanism, the hairspring (1, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150 , 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270) extending substantially in one plane, the spiral spring comprising a flexible ribbon (2) wound on itself along several turns, the tape (2) having a predefined rigidity, the spiral spring (1, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270) comprising means for adjusting its rigidity, characterized in that the adjustment means comprise a flexible element (5) in direct contact with the tape (2), so as to add additional rigidity to the tape (2), the flexible element (5) preferably having a greater rigidity than that of the tape (2), the adjustment means comprising prestressing means (6) for applying a variable force or torque to the flexible element (5) so as to vary the rigidity of the flexible element (5). 2. Hairspring according to any one of the preceding claims, characterized in that the flexible element (5) is arranged at an outer end (4) of the tape (2). 3. Hairspring according to any one of the preceding claims, characterized in that the flexible element (5) is arranged at an inner end (9) of the tape (2). 4. Hairspring according to any one of the preceding claims, characterized in that the flexible element (5) comprises a flexible neck (8, 101). 5. Hairspring according to any one of claims 1 to 3, characterized in that the flexible element (5) comprises a translation table provided with two flexible blades (21, 22, 42, 43, 74 , 78) substantially parallel and a movable rigid part (23, 45) to which the tape (2) is connected. 6. Hairspring according to any one of claims 1 to 3, characterized in that the flexible element (5) comprises a flexible guide provided with two crossed blades (27, 28, 33, 34) and a movable rigid part (31, 37) to which the tape (2) is connected. 7. Hairspring according to any one of claims 1 to 3, characterized in that the flexible element (5) comprises a flexible guide provided with two uncrossed blades (51, 52) and a rigid movable part (54) on which the ribbon (2) is connected. 8. Hairspring according to any one of claims 1 to 3, characterized in that the flexible element (5) comprises a flexible ring (12) to which the ribbon (2) is connected. 9. Hairspring according to any one of claims 1 to 3, characterized in that the flexible element (5) comprises a flexible arm (18) to which the ribbon (2) is connected. 10. Hairspring according to any one of claims 1 to 3, characterized in that the flexible element (5) comprises a plurality of rigid sections (93, 94, 95, 96) connected by blades (97 ) or flexible necks (101). 11. Hairspring according to any one of claims 1 to 3, characterized in that the flexible element (5) comprises a single flexible blade (119). 12. Hairspring according to any one of the preceding claims, characterized in that the flexible element (5) is connected on the other hand to a fixed support (11, 14, 17, 24, 29, 38, 44, 53, 93, 117). 13. Hairspring according to any one of the preceding claims, characterized in that the prestressing means (6) comprise a screw (55) configured to bear against the flexible element (5). 14. Hairspring according to any one of claims 1 to 12, characterized in that the prestressing means (6) comprise a first magnet (47, 57) integral with the flexible element (5) and a second magnet (48, 58) movable relative to the first magnet (47, 58). 15. Hairspring according to any one of claims 1 to 12, characterized in that the prestressing means (6) comprise a spring (55) and a movable element (59, 75) making it possible to stretch or compress the spring (55). 16. Hairspring according to claim 15, characterized in that the spring comprises several flexible blades (72) substantially parallel and another movable element (75, 76). 17. Hairspring according to any one of claims 1 to 12, characterized in that the prestressing means (6) comprise a secondary flexible blade (61, 122, 128) connected to the flexible element (5) . 18. Hairspring according to any one of claims 15 to 17, characterized in that the biasing means (6) comprise a lever (81, 89, 106, 124). 19. Rotary resonator mechanism, in particular for a watch movement, comprising an oscillating mass, characterized in that it comprises a hairspring (1, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 , 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270) according to any one of the preceding claims.