EP3502788B1 - Standalone device for adjusting the active length of a hairspring - Google Patents

Standalone device for adjusting the active length of a hairspring Download PDF

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Publication number
EP3502788B1
EP3502788B1 EP17208988.0A EP17208988A EP3502788B1 EP 3502788 B1 EP3502788 B1 EP 3502788B1 EP 17208988 A EP17208988 A EP 17208988A EP 3502788 B1 EP3502788 B1 EP 3502788B1
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EP
European Patent Office
Prior art keywords
balance
balance spring
active length
regulator
pivot arm
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP17208988.0A
Other languages
German (de)
French (fr)
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EP3502788A1 (en
Inventor
Paulo Bravo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Swatch Group Research and Development SA
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Swatch Group Research and Development SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Swatch Group Research and Development SA filed Critical Swatch Group Research and Development SA
Priority to CH01574/17A priority Critical patent/CH714480A2/en
Priority to EP17208988.0A priority patent/EP3502788B1/en
Priority to JP2018221969A priority patent/JP6688371B2/en
Priority to CN201811492233.2A priority patent/CN109991826B/en
Priority to US16/221,664 priority patent/US11397410B2/en
Publication of EP3502788A1 publication Critical patent/EP3502788A1/en
Application granted granted Critical
Publication of EP3502788B1 publication Critical patent/EP3502788B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B18/00—Mechanisms for setting frequency
    • G04B18/02—Regulator or adjustment devices; Indexing devices, e.g. raquettes
    • G04B18/023—Regulator or adjustment devices; Indexing devices, e.g. raquettes with means for fine adjustment of the indexing device
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B17/00—Mechanisms for stabilising frequency
    • G04B17/04—Oscillators acting by spring tension
    • G04B17/06—Oscillators with hairsprings, e.g. balance
    • G04B17/063—Balance construction
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B17/00—Mechanisms for stabilising frequency
    • G04B17/20—Compensation of mechanisms for stabilising frequency
    • G04B17/26—Compensation of mechanisms for stabilising frequency for the effect of variations of the impulses
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B17/00—Mechanisms for stabilising frequency
    • G04B17/20—Compensation of mechanisms for stabilising frequency
    • G04B17/28—Compensation of mechanisms for stabilising frequency for the effect of unbalance of the weights, e.g. tourbillon
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B18/00—Mechanisms for setting frequency
    • G04B18/02—Regulator or adjustment devices; Indexing devices, e.g. raquettes
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B18/00—Mechanisms for setting frequency
    • G04B18/02—Regulator or adjustment devices; Indexing devices, e.g. raquettes
    • G04B18/028—Setting the regulator by means coupled to or depending on another device, e.g. by the time indication setting mechanism
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B18/00—Mechanisms for setting frequency
    • G04B18/04—Adjusting the beat of the pendulum, balance, or the like, e.g. putting into beat
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B18/00—Mechanisms for setting frequency
    • G04B18/04—Adjusting the beat of the pendulum, balance, or the like, e.g. putting into beat
    • G04B18/06—Adjusting the beat of the pendulum, balance, or the like, e.g. putting into beat by setting the collet or the stud of a hairspring

Definitions

  • the invention relates to a device for autonomous adjustment of the active length of a hairspring, for an oscillator of the balance-spring type.
  • the invention also relates to a watch movement comprising the device for autonomous adjustment of the active length of a hairspring and an oscillator of the balance-spring type.
  • the invention further relates to a timepiece, in particular a watch, comprising the watch movement.
  • the outer end of the hairspring is immobilized by a stud fixed to a stud holder secured to a rooster.
  • a mobile racket in rotation with respect to the eyebolt holder is provided to adjust the active length of the hairspring, thus making it possible to adjust the frequency of the balance-spring.
  • the racket is a lever, generally provided with two arms, which pivots centered on the coordinate of the balance shaft.
  • a first arm of the racket carries for example two pins between which the hairspring is free.
  • a second racket arm can be manually operated to rotate the racket by a certain angle around the balance shaft. This allows the actual position of the metering point to be changed.
  • the active length of the hairspring is reduced or increased.
  • a drawback of such a manual adjustment device is that the earth's gravity influences the frequency of the oscillations of the sprung balance as a function of the orientation of the corresponding watch movement.
  • the rate of a watch may have a significant variation in rate between its horizontal and vertical positions, in particular.
  • the oscillations of the balance-spring cause a disturbance of its active length and therefore a slight variation in the frequency of the oscillations of the balance-spring assembly. .
  • a solution implementing a device for adjusting the active length of the hairspring in which the racket carries clamping means intended to clamp an end portion of the hairspring in order to define the active length of the latter.
  • the outer end of the hairspring is also integral with a fixing system mounted to move relative to the racket and arranged to cooperate with the latter.
  • the clamping means consisting for example of a pin-eccentric clamping system in which the end portion of the hairspring is clamped, can be loosened or tightened at will by a watchmaker.
  • the object of the invention is therefore to provide a device for adjusting the active length of a hairspring, for an oscillator of the sprung balance type, making it possible to counterbalance in a simple, precise and autonomous manner the effects of gravity, in particular the disturbances of the isochronism of the balance of the oscillator, and overcoming the aforementioned drawbacks of the state of the art.
  • the invention relates to a device for independent adjustment of the active length of a hairspring, for an oscillator of the balance-spring type, which comprises the characteristics mentioned in independent claim 1.
  • An advantage of the adjustment device according to the invention lies in the fact that it comprises elastic constraint means configured to exert an elastic return action in position on the racket, and a weight mounted freely in rotation on the cock and connected to the racket pivot arm.
  • a rotation of the weight, freely subjected to gravity thus causes a displacement of the pivoting arm of the racket, between a rest position and a correction position of the device, and acts simultaneously on the means for modifying the active length of the racket. hairspring, making it possible to adjust the latter in order to compensate for disturbances in the isochronism of the balance due to gravity.
  • the adjustment device according to the invention makes it possible to compensate precisely for the operation of the oscillator as a function of its position in space, by counterbalancing the disturbances of the isochronism of the balance due to gravity, and this independently.
  • the adjustment device further comprises a drive cam for the pivoting arm of the racket, said cam being integral with the flyweight and in contact with the pivoting arm.
  • the cam is in contact with the pivoting arm of the racket whatever the position of the flyweight. This makes it possible to constantly compensate for the rate of the oscillator as a function of its position in space, as well as to further improve the precision of the correction.
  • the elastic constraint means comprise an elastically deformable arm, a first end of the arm resting against a part integral with the cock, a second end of the arm being fixed to the racket.
  • the racket, the pivot arm and the elastically deformable arm form a single piece of material. This makes it possible to reduce the bulk as well as to improve the reliability of the adjustment device.
  • the adjustment device further comprises means for adjusting the elastic stress defined by the elastic stress means. This allows a user to be able to adjust the intensity of the elastic return action exerted on the racket, depending for example on the type of use desired for the watch equipped with the adjustment device.
  • the invention also relates to a watch movement comprising the adjustment device described above, and which comprises the characteristics mentioned in dependent claim 14.
  • the invention also relates to a timepiece comprising the horological movement described above, and which comprises the characteristics mentioned in dependent claim 15.
  • the figure 1 shows a part of a timepiece 1, which comprises a timepiece movement 2.
  • the timepiece 1 is a watch.
  • the watch movement 2 comprises an oscillator provided with a balance 4 and a balance spring 5, and a device 6 for independent adjustment of the active length of the balance spring 5.
  • the balance spring 5 is fixed to a balance shaft 7. 4 by its internal end (not visible).
  • the balance shaft 7 4 has one end pivotally mounted in a balance bridge (the latter not being visible in the figures for greater clarity).
  • the outer end of the hairspring 5 is fixed in a conventional manner to a stud 8 fixed to a stud holder 10, the stud holder 10 being secured to a cock 12 by light tightening.
  • the eyebolt 10 is pivotally mounted on the cock 12 concentrically with the balance shaft 7 4, as illustrated in FIG. figure 2 .
  • the balance shaft 7 4 is pivotally mounted in the cock 12.
  • the adjustment device 6 is mounted on a frame 13 of the watch movement 2 by means of the cock 12, and comprises a racket 14. As shown in FIG. figure 2 , the racket 14 is pivotally mounted on the eyebolt 10 concentrically with the balance shaft 7 4. The racket 14 comprises a pivot arm 16 and means 18 for modifying the active length of the hairspring 5.
  • the means 18 for modifying the active length of the hairspring 5 are suitable for modifying the active length of the hairspring 5 by pivoting the racket 14.
  • the means 18 for modifying the active length of the hairspring 5 comprise two pins 19 fixed to the racket 14.
  • the hairspring 5 is arranged so that an outer turn 21 of the hairspring 5 passes between the two pins 19.
  • Both pins pins 19 act as a clamp for the outer coil 21 and are oriented along a plane substantially perpendicular to the frame 13 of the watch movement 2, in other words along a substantially vertical plane when the watch movement 2 extends along a horizontal plane.
  • the upper ends of the two pins 19 are for example driven into a slot 23 formed in the racket 14, which makes it possible to fix the pins 19 to the racket 14.
  • Lower main portions of the pins 19 thus extend from the side of a lower face 14a of the racket. racket 14, allowing the outer turn 21 of the hairspring 5 to be able to be arranged between these lower main portions.
  • the pins 19 have a substantially parallelepipedal shape. However, any other shape than the parallelepiped shape can be envisaged for the pins 19 in the context of the present invention.
  • the adjustment device 6 further comprises elastic constraint means 20 and a weight 22.
  • the adjustment device 6 further comprises a cam 24 for driving the pivot arm 16 of the racket 14.
  • the adjustment device 6 may also include means 26 for adjusting the elastic stress defined by the elastic stress means 20, and shock absorbing means 28.
  • the elastic constraint means 20 are configured to exert an elastic return action in position on the racket 14. More precisely, the elastic constraint means 20 are configured to exert, on the racket 14, an elastic return action towards a position of. rest of the adjuster 6 illustrated on figure 3 .
  • the elastic constraint means 20 comprise an elastically deformable arm 30. A first end 32a of the arm 30 bears against a part 34 integral with the cock 12, making it possible to put the arm 30 in elastic constraint.
  • the cock 12 can for example be provided, on a lateral surface 12a, with a flange 36 for supporting and guiding the deformable arm 30.
  • the part 34 is for example constituted by the means 26 of adjustment of the elastic stress, as will be detailed later, but can alternatively be formed of a pin secured to the cock 12.
  • a second end 32b of the arm 30 is fixed to the racket 14.
  • the racket 14, the pivot arm 16 and the elastically deformable arm 30 form a single piece of material.
  • the piece of material formed by the racket 14, the pivot arm 16 and the elastically deformable arm 30 defines for example a substantially “U” shape, the pivot arm 16 and the elastically deformable arm 30 forming the two branches of the “U”. ".
  • the flyweight 22 is mounted to rotate freely on the cock 12 and is connected to the pivot arm 16 of the racket 14 so that a rotation of the flyweight 22 causes a displacement of the pivot arm. 16 of the racket 14 and acts simultaneously on the means 18 for modifying the active length of the hairspring 5.
  • the weight 22 is for example made up of a half-full disc. In an alternative embodiment not shown in the figures, the weight 22 consists of a solid bi-material disc, the two materials of the disc having different densities.
  • the weight 22 is mounted to rotate freely on the plate 13.
  • the cam 24 is integral with the weight 22 and is in contact with the pivot arm 16.
  • the flyweight 22 is mounted to rotate freely on the cock 12 via an axis 38 integral with the flyweight 22.
  • the cam 24 is mounted on the flyweight 22 concentrically with the axis 38 and is integral with the axis 38.
  • the cam 24 is a radial cam with an external profile.
  • a radial cam 24 with a substantially rectangular exterior profile is shown in the figures 1 to 4 , in practice any type of shape can be considered for the outer profile of the cam 24, depending on the type of hairspring 5 used.
  • a radial cam with a triangular, oblong or even ovoid outer profile can also be used in the context of the present invention.
  • a flat portion 40 of the cam 24 is in contact with the pivoting arm 16 of the racket 14, while in the correction position of the device 6, a wedge or an angle 42 of the cam 24 is in contact with the pivot arm 16. More preferably, as seen in the figures 1 , 3 and 4 , the cam 24 is in contact with the pivot arm 16 of the racket 14 regardless of the position of the flyweight 22.
  • the cam 24 is arranged between the pivot arm 16 and the elastically deformable arm 30 of so that the cam 24 acts as a support for the pivot arm 16 and thus contributes to the elastic stressing of the elastically deformable arm 30.
  • the support part 34 of the elastically deformable arm 30 is also arranged between the pivot arm 16 and the elastically deformable arm 30, in the recess between the two branches of the “U”.
  • the means for adjusting the elastic stress 26 can serve as a part 34 for supporting the elastically deformable arm 30.
  • the elastic stress adjustment means 26 comprise an elastic stress adjustment button 44, movable between several adjustment positions.
  • the adjustment button 44 is preferably operable from outside the timepiece 1 by a user, by any means known to those skilled in the art such as, in particular, a push button or a bezel.
  • the elastic stress adjustment knob 44 has for example an outer profile defining a radial contour of variable radius.
  • the adjustment knob 44 acts as a support part 34 of the elastically deformable arm 30, this makes it possible to modify the position of the arm 30 relative to the pivot arm 16, and therefore to modify the intensity of the elastic stress exerted on racket 14, as a function of the position of the adjustment button 44.
  • the tripping threshold of the cam 24 / weight 22 assembly is thus modified, making it possible to adapt the control device. setting 6 according to the use desired by the user.
  • the adjustment button 44 can be movable between three adjustment positions, corresponding to uses in sedentary mode, in normal mode, or even in sports mode of the watch. watch.
  • the shock absorbing means 28 are arranged on the racket 14 and are at least partially supported on the balance shaft 7 4.
  • the shock absorbing means 28 comprise for example a usual shock absorber 46 in which is chased a spring clover 48.
  • the weight 22 freely subjected to gravity, can rotate about its axis of rotation and thus cause a displacement of the pivot arm 16 of the racket. 14, as shown on figures 3 and 4 .
  • this rotation of the weight 22 acts simultaneously on the means 18 for modifying the active length of the hairspring 5, making it possible to continuously adjust the active length of the hairspring in order to compensate for the disturbances of the isochronism of the balance due to the gravity.

Description

DOMAINE TECHNIQUE DE L'INVENTIONTECHNICAL FIELD OF THE INVENTION

L'invention concerne un dispositif de réglage autonome de la longueur active d'un spiral, pour oscillateur de type balancier-spiral.The invention relates to a device for autonomous adjustment of the active length of a hairspring, for an oscillator of the balance-spring type.

L'invention concerne également un mouvement horloger comportant le dispositif de réglage autonome de la longueur active d'un spiral et un oscillateur de type balancier-spiral.The invention also relates to a watch movement comprising the device for autonomous adjustment of the active length of a hairspring and an oscillator of the balance-spring type.

L'invention concerne en outre une pièce d'horlogerie, notamment une montre, comportant le mouvement horloger.The invention further relates to a timepiece, in particular a watch, comprising the watch movement.

ETAT DE LA TECHNIQUESTATE OF THE ART

Dans le domaine des montres munies d'oscillateurs mécaniques de type balancier-spiral, on connait des mécanismes de réglage manuel de la longueur active du spiral.In the field of watches equipped with mechanical oscillators of the spring-balance type, mechanisms are known for manual adjustment of the active length of the balance-spring.

Par exemple, dans des mécanismes de réglage manuel courants, l'extrémité externe du spiral est immobilisée par un piton fixé à un porte-piton solidaire d'un coq. Une raquette mobile en rotation par rapport au porte-piton est prévue pour ajuster la longueur active du spiral, permettant ainsi d'ajuster la fréquence du balancier-spiral. La raquette est un levier, généralement muni de deux bras, qui pivote centré sur la coordonnée de l'arbre de balancier. Un premier bras de la raquette porte par exemples deux goupilles entre lesquelles le spiral est libre. Un deuxième bras de la raquette peut être actionné manuellement pour faire pivoter la raquette d'un certain angle autour de l'arbre de balancier. Ceci permet de modifier la position réelle du point de comptage. Lorsque la raquette pivote, la longueur active du spiral est réduite ou augmentée. Toutefois, un inconvénient d'un tel dispositif de réglage manuel est que la gravité terrestre influence la fréquence des oscillations du balancier-spiral en fonction de l'orientation du mouvement horloger correspondant. Ainsi, la marche d'une montre peut présenter un écart de marche important entre ses positions horizontale et verticale, notamment. En outre, lorsque le spiral se déplace entre les goupilles à cause du jeu entre ces deux derniers, les oscillations du balancier-spiral entraînent une perturbation de sa longueur active et donc une variation légère de la fréquence des oscillations de l'ensemble balancier-spiral.For example, in current manual adjustment mechanisms, the outer end of the hairspring is immobilized by a stud fixed to a stud holder secured to a rooster. A mobile racket in rotation with respect to the eyebolt holder is provided to adjust the active length of the hairspring, thus making it possible to adjust the frequency of the balance-spring. The racket is a lever, generally provided with two arms, which pivots centered on the coordinate of the balance shaft. A first arm of the racket carries for example two pins between which the hairspring is free. A second racket arm can be manually operated to rotate the racket by a certain angle around the balance shaft. This allows the actual position of the metering point to be changed. As the racket rotates, the active length of the hairspring is reduced or increased. However, a drawback of such a manual adjustment device is that the earth's gravity influences the frequency of the oscillations of the sprung balance as a function of the orientation of the corresponding watch movement. Thus, the rate of a watch may have a significant variation in rate between its horizontal and vertical positions, in particular. In addition, when the hairspring moves between the pins because of the play between the latter two, the oscillations of the balance-spring cause a disturbance of its active length and therefore a slight variation in the frequency of the oscillations of the balance-spring assembly. .

Afin de limiter les effets négatifs de la gravité il est connu, notamment du document brevet CH 705 605 B1 , une solution mettant en oeuvre un dispositif de réglage de la longueur active du spiral, dans lequel la raquette porte des moyens de pinçage destinés à pincer une portion terminale du spiral pour définir la longueur active de ce dernier. L'extrémité externe du spiral est en outre solidaire d'un système de fixation monté mobile par rapport à la raquette et agencé pour coopérer avec celle-ci. Les moyens de pinçage, constitués par exemple d'un système de pincement goupille-excentrique dans lequel la portion terminale du spiral est pincée, peuvent être desserrés ou serrés à loisir par un horloger. Lorsque l'horloger a desserré le système de pincement à goupille-excentrique, il peut déplacer le système de fixation au moyen d'un outil, permettant ainsi de déplacer le spiral relativement à la raquette qui reste fixe, et donc par rapport à la goupille, ce qui permet de modifier la longueur active du spiral. L'horloger peut alors pincer le spiral contre la goupille en resserrant le système de pincement, pour replacer le dispositif de réglage en position de service. Toutefois, une telle solution reste une solution de réglage manuel, ce qui a comme inconvénient de limiter considérablement la précision du réglage permettant de contrebalancer les effets de la gravité. En outre, une telle solution est fastidieuse à mettre en œuvre, du fait des différentes étapes d'ajustement manuel par un horloger permettant le réglage. On connaît en outre le document EP2908187 A1 , dans lequel un dispositif de réglage autonome de la longueur active du spiral met en oeuvre un dispositif régulateur, où ce dernier impose une variation périodique de la longueur active dudit spiral.In order to limit the negative effects of gravity, it is known, in particular from the patent document CH 705 605 B1 , a solution implementing a device for adjusting the active length of the hairspring, in which the racket carries clamping means intended to clamp an end portion of the hairspring in order to define the active length of the latter. The outer end of the hairspring is also integral with a fixing system mounted to move relative to the racket and arranged to cooperate with the latter. The clamping means, consisting for example of a pin-eccentric clamping system in which the end portion of the hairspring is clamped, can be loosened or tightened at will by a watchmaker. When the watchmaker has loosened the eccentric pin pinching system, he can move the fixing system by means of a tool, thus making it possible to move the hairspring relative to the racket which remains fixed, and therefore relative to the pin. , which makes it possible to modify the active length of the hairspring. The watchmaker can then pinch the hairspring against the pin by tightening the pinching system, to put the adjustment device back into the service position. However, such a solution remains a manual adjustment solution, which has the drawback of considerably limiting the precision of the adjustment making it possible to counterbalance the effects of gravity. In addition, such This solution is tedious to implement, due to the various steps of manual adjustment by a watchmaker allowing the adjustment. We also know the document EP2908187 A1 , in which an autonomous device for adjusting the active length of the hairspring uses a regulating device, where the latter imposes a periodic variation of the active length of said hairspring.

RESUMÉ DE L'INVENTIONSUMMARY OF THE INVENTION

L'invention a donc pour but de fournir un dispositif de réglage de la longueur active d'un spiral, pour oscillateur de type balancier-spiral, permettant de contrebalancer de manière simple, précise et autonome les effets de la gravité, notamment les perturbations de l'isochronisme du balancier de l'oscillateur, et palliant les inconvénients susmentionnés de l'état de la technique.The object of the invention is therefore to provide a device for adjusting the active length of a hairspring, for an oscillator of the sprung balance type, making it possible to counterbalance in a simple, precise and autonomous manner the effects of gravity, in particular the disturbances of the isochronism of the balance of the oscillator, and overcoming the aforementioned drawbacks of the state of the art.

A cet effet, l'invention concerne un dispositif de réglage autonome de la longueur active d'un spiral, pour oscillateur de type balancier-spiral, qui comprend les caractéristiques mentionnées dans la revendication indépendante 1.To this end, the invention relates to a device for independent adjustment of the active length of a hairspring, for an oscillator of the balance-spring type, which comprises the characteristics mentioned in independent claim 1.

Des formes particulières du dispositif de réglage sont définies dans les revendications dépendantes 2 à 13.Particular forms of the adjustment device are defined in dependent claims 2 to 13.

Un avantage du dispositif de réglage selon l'invention réside dans le fait qu'il comprend des moyens de contrainte élastique configurés pour exercer une action élastique de rappel en position sur la raquette, et une masselotte montée libre en rotation sur le coq et reliée au bras de pivotement de la raquette. Une rotation de la masselotte, soumise librement à la gravité, entraîne ainsi un déplacement du bras de pivotement de la raquette, entre une position de repos et une position de correction du dispositif, et agit simultanément sur les moyens de modification de la longueur active du spiral, permettant d'ajuster cette dernière afin de compenser les perturbations de l'isochronisme du balancier dues à la gravité. De ce fait, le dispositif de réglage selon l'invention permet de compenser de manière précise la marche de l'oscillateur en fonction de sa position dans l'espace, en contrebalançant les perturbations de l'isochronisme du balancier dues à la gravité, et ce de manière autonome.An advantage of the adjustment device according to the invention lies in the fact that it comprises elastic constraint means configured to exert an elastic return action in position on the racket, and a weight mounted freely in rotation on the cock and connected to the racket pivot arm. A rotation of the weight, freely subjected to gravity, thus causes a displacement of the pivoting arm of the racket, between a rest position and a correction position of the device, and acts simultaneously on the means for modifying the active length of the racket. hairspring, making it possible to adjust the latter in order to compensate for disturbances in the isochronism of the balance due to gravity. As a result, the adjustment device according to the invention makes it possible to compensate precisely for the operation of the oscillator as a function of its position in space, by counterbalancing the disturbances of the isochronism of the balance due to gravity, and this independently.

Selon un mode de réalisation préférentiel de l'invention, le dispositif de réglage comprend en outre une came d'entraînement du bras de pivotement de la raquette, ladite came étant solidaire de la masselotte et en contact avec le bras de pivotement.According to a preferred embodiment of the invention, the adjustment device further comprises a drive cam for the pivoting arm of the racket, said cam being integral with the flyweight and in contact with the pivoting arm.

Avantageusement, la came est en contact avec le bras de pivotement de la raquette quelle que soit la position de la masselotte. Ceci permet de compenser en permanence la marche de l'oscillateur en fonction de sa position dans l'espace, ainsi que d'améliorer encore la précision de la correction.Advantageously, the cam is in contact with the pivoting arm of the racket whatever the position of the flyweight. This makes it possible to constantly compensate for the rate of the oscillator as a function of its position in space, as well as to further improve the precision of the correction.

Selon un mode de réalisation particulier de l'invention, les moyens de contrainte élastique comprennent un bras déformable élastiquement, une première extrémité du bras étant en appui contre une pièce solidaire du coq, une seconde extrémité du bras étant fixée à la raquette.According to a particular embodiment of the invention, the elastic constraint means comprise an elastically deformable arm, a first end of the arm resting against a part integral with the cock, a second end of the arm being fixed to the racket.

Avantageusement, la raquette, le bras de pivotement et le bras déformable élastiquement forment une seule et même pièce de matière. Ceci permet de réduire l'encombrement ainsi que d'améliorer la fiabilité du dispositif de réglage.Advantageously, the racket, the pivot arm and the elastically deformable arm form a single piece of material. This makes it possible to reduce the bulk as well as to improve the reliability of the adjustment device.

Avantageusement, le dispositif de réglage comprend en outre des moyens de réglage de la contrainte élastique définie par les moyens de contrainte élastique. Ceci permet à un utilisateur de pouvoir régler l'intensité de l'action élastique de rappel s'exerçant sur la raquette, en fonction par exemple du type d'utilisation souhaitée pour la montre équipée du dispositif de réglage.Advantageously, the adjustment device further comprises means for adjusting the elastic stress defined by the elastic stress means. This allows a user to be able to adjust the intensity of the elastic return action exerted on the racket, depending for example on the type of use desired for the watch equipped with the adjustment device.

A cet effet, l'invention concerne également un mouvement horloger comportant le dispositif de réglage décrit ci-dessus, et qui comprend les caractéristiques mentionnées dans la revendication dépendante 14.To this end, the invention also relates to a watch movement comprising the adjustment device described above, and which comprises the characteristics mentioned in dependent claim 14.

A cet effet, l'invention concerne également une pièce d'horlogerie comportant le mouvement horloger décrit ci-dessus, et qui comprend les caractéristiques mentionnées dans la revendication dépendante 15.To this end, the invention also relates to a timepiece comprising the horological movement described above, and which comprises the characteristics mentioned in dependent claim 15.

BRÈVE DESCRIPTION DES FIGURESBRIEF DESCRIPTION OF THE FIGURES

Les buts, avantages et caractéristiques du dispositif de réglage de la longueur active d'un spiral, ainsi que du mouvement horloger et de la pièce d'horlogerie le comprenant, apparaîtront mieux dans la description suivante sur la base d'au moins une forme d'exécution non limitative illustrée par les dessins sur lesquels :

  • la figure 1 est une vue en perspective d'un mouvement horloger d'une montre comprenant un dispositif de réglage de la longueur active d'un spiral selon l'invention ;
  • la figure 2 une vue en perspective éclatée du dispositif de réglage de la figure 1 ;
  • la figure 3 est une vue de dessus du dispositif de réglage de la figure 1, dans une position de repos du dispositif ;
  • la figure 4 est une vue analogue à celle de la figure 3, dans une position de correction du dispositif.
The aims, advantages and characteristics of the device for adjusting the active length of a hairspring, as well as of the horological movement and of the timepiece comprising it, will become more apparent in the following description on the basis of at least one form of 'non-limiting execution illustrated by the drawings in which:
  • the figure 1 is a perspective view of a watch movement of a watch comprising a device for adjusting the active length of a hairspring according to the invention;
  • the figure 2 an exploded perspective view of the adjustment device of the figure 1 ;
  • the figure 3 is a top view of the speed adjuster figure 1 , in a rest position of the device;
  • the figure 4 is a view similar to that of the figure 3 , in a corrective position of the device.

DESCRIPTION DETAILLEE DE L'INVENTIONDETAILED DESCRIPTION OF THE INVENTION

Dans la description suivante, il est fait référence à un mouvement horloger muni d'un dispositif de réglage de la longueur active d'un spiral, pour oscillateur de type balancier-spiral. Les composants usuels du mouvement horloger, qui sont bien connus d'un homme du métier dans ce domaine technique, ne sont décrits que de manière simplifiée ou pas décrits du tout. L'homme du métier saura en effet adapter ces différents composants et les faire coopérer pour le fonctionnement du mouvement horloger. En particulier, tout ce qui concerne le mécanisme d'échappement du mouvement horloger ne sera pas décrit par la suite, bien qu'un tel mécanisme d'échappement puisse avantageusement coopérer avec le dispositif de réglage selon l'invention.In the following description, reference is made to a watch movement provided with a device for adjusting the active length of a hairspring, for an oscillator of the balance-spring type. The usual components of the watch movement, which are well known to a person skilled in the art in this technical field, are only described in a simplified manner or not described at all. Those skilled in the art will in fact know how to adapt these various components and make them cooperate for the operation of the watch movement. In particular, everything relating to the escapement mechanism of the watch movement will not be described below, although such an escape mechanism can advantageously cooperate with the adjustment device according to the invention.

La figure 1 représente une partie d'une pièce d'horlogerie 1, qui comprend un mouvement horloger 2. Dans l'exemple de réalisation particulier de la figure 1, la pièce d'horlogerie 1 est une montre. Le mouvement horloger 2 comporte un oscillateur muni d'un balancier 4 et d'un spiral 5, et un dispositif 6 de réglage autonome de la longueur active du spiral 5. De manière conventionnelle, le spiral 5 est fixé à un arbre 7 de balancier 4 par son extrémité interne (non visible). L'arbre 7 de balancier 4 présente une extrémité montée à pivot dans un pont de balancier (ce dernier n'étant pas visible sur les figures pour plus de clarté). L'extrémité externe du spiral 5 est fixée de manière classique à un piton 8 fixé à un porte-piton 10, le porte-piton 10 étant solidaire d'un coq 12 par léger serrage. Plus précisément, le porte-piton 10 est monté à pivotement sur le coq 12 concentriquement à l'arbre 7 de balancier 4, comme illustré sur la figure 2. L'arbre 7 de balancier 4 est monté à pivotement dans le coq 12.The figure 1 shows a part of a timepiece 1, which comprises a timepiece movement 2. In the particular embodiment of the figure 1 , the timepiece 1 is a watch. The watch movement 2 comprises an oscillator provided with a balance 4 and a balance spring 5, and a device 6 for independent adjustment of the active length of the balance spring 5. Conventionally, the balance spring 5 is fixed to a balance shaft 7. 4 by its internal end (not visible). The balance shaft 7 4 has one end pivotally mounted in a balance bridge (the latter not being visible in the figures for greater clarity). The outer end of the hairspring 5 is fixed in a conventional manner to a stud 8 fixed to a stud holder 10, the stud holder 10 being secured to a cock 12 by light tightening. More precisely, the eyebolt 10 is pivotally mounted on the cock 12 concentrically with the balance shaft 7 4, as illustrated in FIG. figure 2 . The balance shaft 7 4 is pivotally mounted in the cock 12.

Le dispositif de réglage 6 est monté sur un bâti 13 du mouvement horloger 2 par l'intermédiaire du coq 12, et comprend une raquette 14. Comme représenté sur la figure 2, la raquette 14 est montée à pivotement sur le porte-piton 10 concentriquement à l'arbre 7 de balancier 4. La raquette 14 comprend un bras de pivotement 16 et des moyens 18 de modification de la longueur active du spiral 5.The adjustment device 6 is mounted on a frame 13 of the watch movement 2 by means of the cock 12, and comprises a racket 14. As shown in FIG. figure 2 , the racket 14 is pivotally mounted on the eyebolt 10 concentrically with the balance shaft 7 4. The racket 14 comprises a pivot arm 16 and means 18 for modifying the active length of the hairspring 5.

Les moyens 18 de modification de la longueur active du spiral 5 sont aptes à modifier la longueur active du spiral 5 par pivotement de la raquette 14. Dans un exemple de réalisation particulier illustré sur la figure 2, les moyens 18 de modification de la longueur active du spiral 5 comportent deux goupilles 19 fixées à la raquette 14. Le spiral 5 est agencé de sorte à ce qu'une spire extérieure 21 du spiral 5 passe entre les deux goupilles 19. Les deux goupilles 19 agissent comme une pince pour la spire extérieure 21 et sont orientées selon un plan sensiblement perpendiculaire au bâti 13 du mouvement horloger 2, autrement dit selon un plan sensiblement vertical lorsque le mouvement horloger 2 s'étend selon un plan horizontal. Comme illustré sur la figure 2, les extrémités supérieures des deux goupilles 19 sont par exemple chassées dans une fente 23 ménagée dans la raquette 14, ce qui permet de fixer les goupilles 19 à la raquette 14. Des portions principales inférieures des goupilles 19 s'étendent ainsi du côté d'une face inférieure 14a de la raquette 14, permettant à la spire extérieure 21 du spiral 5 de pouvoir être agencée entre ces portions principales inférieures. Dans l'exemple de réalisation particulier représenté à la figure 2, les goupilles 19 présentent une forme sensiblement parallélépipédique. Néanmoins, toute autre forme que la forme parallélépipédique est envisageable pour les goupilles 19 dans le cadre de la présente invention.The means 18 for modifying the active length of the hairspring 5 are suitable for modifying the active length of the hairspring 5 by pivoting the racket 14. In a particular embodiment illustrated in FIG. figure 2 , the means 18 for modifying the active length of the hairspring 5 comprise two pins 19 fixed to the racket 14. The hairspring 5 is arranged so that an outer turn 21 of the hairspring 5 passes between the two pins 19. Both pins pins 19 act as a clamp for the outer coil 21 and are oriented along a plane substantially perpendicular to the frame 13 of the watch movement 2, in other words along a substantially vertical plane when the watch movement 2 extends along a horizontal plane. As shown on the figure 2 , the upper ends of the two pins 19 are for example driven into a slot 23 formed in the racket 14, which makes it possible to fix the pins 19 to the racket 14. Lower main portions of the pins 19 thus extend from the side of a lower face 14a of the racket. racket 14, allowing the outer turn 21 of the hairspring 5 to be able to be arranged between these lower main portions. In the particular embodiment shown in figure 2 , the pins 19 have a substantially parallelepipedal shape. However, any other shape than the parallelepiped shape can be envisaged for the pins 19 in the context of the present invention.

Le dispositif de réglage 6 comprend en outre des moyens de contrainte élastique 20 et une masselotte 22. Dans un exemple de réalisation préférentiel, le dispositif de réglage 6 comporte en outre une came 24 d'entraînement du bras de pivotement 16 de la raquette 14. De préférence, le dispositif de réglage 6 peut comporter également des moyens 26 de réglage de la contrainte élastique définie par les moyens de contrainte élastique 20, et des moyens d'amortissement de choc 28.The adjustment device 6 further comprises elastic constraint means 20 and a weight 22. In a preferred embodiment, the adjustment device 6 further comprises a cam 24 for driving the pivot arm 16 of the racket 14. Preferably, the adjustment device 6 may also include means 26 for adjusting the elastic stress defined by the elastic stress means 20, and shock absorbing means 28.

Les moyens de contrainte élastique 20 sont configurés pour exercer une action élastique de rappel en position sur la raquette 14. Plus précisément, les moyens de contrainte élastique 20 sont configurés pour exercer, sur la raquette 14, une action élastique de rappel vers une position de repos du dispositif de réglage 6 illustrée sur la figure 3. Selon un exemple de réalisation particulier, les moyens de contrainte élastique 20 comprennent un bras déformable élastiquement 30. Une première extrémité 32a du bras 30 est en appui contre une pièce 34 solidaire du coq 12, permettant de mettre le bras 30 en contrainte élastique. Pour faciliter cette mise sous contrainte élastique, le coq 12 peut par exemple être muni, sur une surface latérale 12a, d'un rebord 36 d'appui et de guidage du bras déformable 30. La pièce 34 est par exemple constituée des moyens 26 de réglage de la contrainte élastique, comme cela sera détaillé par la suite, mais peut en variante être formée d'un pion solidaire du coq 12. Une seconde extrémité 32b du bras 30 est fixée à la raquette 14. De préférence, comme représenté sur les figures 1 à 4, la raquette 14, le bras de pivotement 16 et le bras déformable élastiquement 30 forment une seule et même pièce de matière. La pièce de matière formée par la raquette 14, le bras de pivotement 16 et le bras déformable élastiquement 30 définit par exemple une forme sensiblement en « U », le bras de pivotement 16 et le bras déformable élastiquement 30 formant les deux branches du « U ».The elastic constraint means 20 are configured to exert an elastic return action in position on the racket 14. More precisely, the elastic constraint means 20 are configured to exert, on the racket 14, an elastic return action towards a position of. rest of the adjuster 6 illustrated on figure 3 . According to a particular exemplary embodiment, the elastic constraint means 20 comprise an elastically deformable arm 30. A first end 32a of the arm 30 bears against a part 34 integral with the cock 12, making it possible to put the arm 30 in elastic constraint. To facilitate this elastic stressing, the cock 12 can for example be provided, on a lateral surface 12a, with a flange 36 for supporting and guiding the deformable arm 30. The part 34 is for example constituted by the means 26 of adjustment of the elastic stress, as will be detailed later, but can alternatively be formed of a pin secured to the cock 12. A second end 32b of the arm 30 is fixed to the racket 14. Preferably, as shown on the figures 1 to 4 , the racket 14, the pivot arm 16 and the elastically deformable arm 30 form a single piece of material. The piece of material formed by the racket 14, the pivot arm 16 and the elastically deformable arm 30 defines for example a substantially “U” shape, the pivot arm 16 and the elastically deformable arm 30 forming the two branches of the “U”. ".

Selon un mode de réalisation préférentiel, la masselotte 22 est montée libre en rotation sur le coq 12 et est reliée au bras de pivotement 16 de la raquette 14 de sorte à ce qu'une rotation de la masselotte 22 entraîne un déplacement du bras de pivotement 16 de la raquette 14 et agisse simultanément sur les moyens 18 de modification de la longueur active du spiral 5. Le déplacement du bras de pivotement 16 de la raquette 14 sous l'effet de la rotation de la masselotte 22, elle-même soumise à la gravité, s'effectue entre une position de repos du dispositif 6, illustrée sur la figure 3, et une position de correction du dispositif 6, illustrée sur la figure 4. Comme illustré sur les figures 1 à 4, la masselotte 22 est par exemple constituée d'un disque demi-plein. Dans une variante de réalisation non représentée sur les figures, la masselotte 22 est constituée d'un disque bi-matière plein, les deux matières du disque présentant des densités distinctes.According to a preferred embodiment, the flyweight 22 is mounted to rotate freely on the cock 12 and is connected to the pivot arm 16 of the racket 14 so that a rotation of the flyweight 22 causes a displacement of the pivot arm. 16 of the racket 14 and acts simultaneously on the means 18 for modifying the active length of the hairspring 5. The movement of the pivot arm 16 of the racket 14 under the effect of the rotation of the flyweight 22, itself subjected to gravity, takes place between a rest position of the device 6, illustrated on figure 3 , and a correction position of the device 6, illustrated on figure 4 . As shown on the figures 1 to 4 , the weight 22 is for example made up of a half-full disc. In an alternative embodiment not shown in the figures, the weight 22 consists of a solid bi-material disc, the two materials of the disc having different densities.

Selon un autre mode de réalisation, la masselotte 22 est montée libre en rotation sur la platine 13.According to another embodiment, the weight 22 is mounted to rotate freely on the plate 13.

Dans l'exemple de réalisation préférentiel selon lequel le dispositif 6 comprend une came 24 d'entraînement du bras de pivotement 16 de la raquette 14, la came 24 est solidaire de la masselotte 22 et est en contact avec le bras de pivotement 16. Dans une variante de réalisation de cet exemple préférentiel, illustrée sur les figures 1 à 4, la masselotte 22 est montée libre en rotation sur le coq 12 via un axe 38 solidaire de la masselotte 22. La came 24 est montée sur la masselotte 22 concentriquement à l'axe 38 et est solidaire de l'axe 38.In the preferred embodiment according to which the device 6 comprises a cam 24 for driving the pivot arm 16 of the racket 14, the cam 24 is integral with the weight 22 and is in contact with the pivot arm 16. In an alternative embodiment of this preferred example, illustrated on the figures 1 to 4 , the flyweight 22 is mounted to rotate freely on the cock 12 via an axis 38 integral with the flyweight 22. The cam 24 is mounted on the flyweight 22 concentrically with the axis 38 and is integral with the axis 38.

De préférence, la came 24 est une came radiale à profil extérieur. Bien qu'une came radiale 24 à profil extérieur sensiblement rectangulaire soit représentée sur les figures 1 à 4, en pratique tout type de forme peut être envisagé pour le profil extérieur de la came 24, en fonction du type de spiral 5 utilisé. Par exemple, une came radiale à profil extérieur triangulaire, oblongue ou encore ovoïde peut également être utilisée dans le cadre de la présente invention. De préférence, et comme représenté sur les figures 3 et 4, en position de repos du dispositif de réglage 6, une portion plane 40 de la came 24 est en contact avec le bras de pivotement 16 de la raquette 14, tandis qu'en position de correction du dispositif 6, un coin ou un angle 42 de la came 24 est en contact avec le bras de pivotement 16. De préférence encore, comme visible sur les figures 1, 3 et 4, la came 24 est en contact avec le bras de pivotement 16 de la raquette 14 quelle que soit la position de la masselotte 22.Preferably, the cam 24 is a radial cam with an external profile. Although a radial cam 24 with a substantially rectangular exterior profile is shown in the figures 1 to 4 , in practice any type of shape can be considered for the outer profile of the cam 24, depending on the type of hairspring 5 used. For example, a radial cam with a triangular, oblong or even ovoid outer profile can also be used in the context of the present invention. Preferably, and as shown in the figures 3 and 4 , in the rest position of the adjustment device 6, a flat portion 40 of the cam 24 is in contact with the pivoting arm 16 of the racket 14, while in the correction position of the device 6, a wedge or an angle 42 of the cam 24 is in contact with the pivot arm 16. More preferably, as seen in the figures 1 , 3 and 4 , the cam 24 is in contact with the pivot arm 16 of the racket 14 regardless of the position of the flyweight 22.

Dans l'exemple de réalisation particulier illustré sur les figures 1 à 4 selon lequel la pièce de matière formée par la raquette 14, le bras de pivotement 16 et le bras déformable élastiquement 30 définit une forme sensiblement en « U », la came 24 est agencée entre le bras de pivotement 16 et le bras déformable élastiquement 30 de sorte à ce que la came 24 serve d'appui au bras de pivotement 16 et contribue ainsi à la mise sous contrainte élastique du bras déformable élastiquement 30. Dans cet exemple de réalisation particulier, la pièce 34 de support du bras déformable élastiquement 30 est également agencée entre le bras de pivotement 16 et le bras déformable élastiquement 30, dans l'évidement entre les deux branches du « U ».In the particular embodiment illustrated on the figures 1 to 4 according to which the piece of material formed by the racket 14, the pivot arm 16 and the elastically deformable arm 30 defines a substantially "U" shape, the cam 24 is arranged between the pivot arm 16 and the elastically deformable arm 30 of so that the cam 24 acts as a support for the pivot arm 16 and thus contributes to the elastic stressing of the elastically deformable arm 30. In this particular embodiment, the support part 34 of the elastically deformable arm 30 is also arranged between the pivot arm 16 and the elastically deformable arm 30, in the recess between the two branches of the “U”.

Les moyens de réglage de la contrainte élastique 26 peuvent servir de pièce 34 de support du bras déformable élastiquement 30. Selon un exemple de réalisation particulier, illustré sur les figures 1 à 4, les moyens de réglage de la contrainte élastique 26 comprennent un bouton de réglage de la contrainte élastique 44, mobile entre plusieurs positions de réglage. Le bouton de réglage 44 est de préférence actionnable de l'extérieur de la pièce d'horlogerie 1 par un utilisateur, par tout moyen connu de l'homme du métier tel que, notamment, un bouton poussoir ou encore une lunette.The means for adjusting the elastic stress 26 can serve as a part 34 for supporting the elastically deformable arm 30. According to a particular embodiment, illustrated in FIGS. figures 1 to 4 , the elastic stress adjustment means 26 comprise an elastic stress adjustment button 44, movable between several adjustment positions. The adjustment button 44 is preferably operable from outside the timepiece 1 by a user, by any means known to those skilled in the art such as, in particular, a push button or a bezel.

Le bouton de réglage de la contrainte élastique 44 présente par exemple un profil extérieur définissant un contour radial de rayon variable. Dans l'exemple illustratif des figures 1 à 4 selon lequel le bouton de réglage 44 fait office de pièce 34 de support du bras déformable élastiquement 30, cela permet de modifier la position du bras 30 par rapport au bras de pivotement 16, et donc de modifier l'intensité de la contrainte élastique exercée sur la raquette 14, en fonction de la position du bouton de réglage 44. En fonction de la position du bouton de réglage 44, le seuil de déclenchement de l'ensemble came 24 / masselotte 22 est ainsi modifié, permettant d'adapter le dispositif de réglage 6 en fonction de l'utilisation souhaitée par l'utilisateur. Par exemple, dans le cas où la pièce d'horlogerie 1 est une montre, le bouton de réglage 44 peut être mobile entre trois positions de réglage, correspondant à des utilisations en mode sédentaire, en mode normal, ou encore en mode sportif de la montre.The elastic stress adjustment knob 44 has for example an outer profile defining a radial contour of variable radius. In the illustrative example of figures 1 to 4 according to which the adjustment knob 44 acts as a support part 34 of the elastically deformable arm 30, this makes it possible to modify the position of the arm 30 relative to the pivot arm 16, and therefore to modify the intensity of the elastic stress exerted on racket 14, as a function of the position of the adjustment button 44. As a function of the position of the adjustment button 44, the tripping threshold of the cam 24 / weight 22 assembly is thus modified, making it possible to adapt the control device. setting 6 according to the use desired by the user. For example, in the case where the timepiece 1 is a watch, the adjustment button 44 can be movable between three adjustment positions, corresponding to uses in sedentary mode, in normal mode, or even in sports mode of the watch. watch.

Les moyens d'amortissement de choc 28 sont agencés sur la raquette 14 et sont au moins partiellement en appui sur l'arbre 7 de balancier 4. Les moyens d'amortisseur de choc 28 comprennent par exemple un amortisseur de choc 46 usuel dans lequel est chassé un ressort trèfle 48.The shock absorbing means 28 are arranged on the racket 14 and are at least partially supported on the balance shaft 7 4. The shock absorbing means 28 comprise for example a usual shock absorber 46 in which is chased a spring clover 48.

On conçoit ainsi qu'en fonction de la position du mouvement horloger 2 dans l'espace, la masselotte 22, soumise librement à la gravité, peut tourner autour de son axe de rotation et entraîner ainsi un déplacement du bras de pivotement 16 de la raquette 14, comme illustré sur les figures 3 et 4. Ce faisant, cette rotation de la masselotte 22 agit simultanément sur les moyens 18 de modification de la longueur active du spiral 5, permettant d'ajuster en continu la longueur active du spiral afin de compenser les perturbations de l'isochronisme du balancier dues à la gravité.It can thus be seen that depending on the position of the watch movement 2 in space, the weight 22, freely subjected to gravity, can rotate about its axis of rotation and thus cause a displacement of the pivot arm 16 of the racket. 14, as shown on figures 3 and 4 . In doing so, this rotation of the weight 22 acts simultaneously on the means 18 for modifying the active length of the hairspring 5, making it possible to continuously adjust the active length of the hairspring in order to compensate for the disturbances of the isochronism of the balance due to the gravity.

Claims (16)

  1. Device (6) for autonomous adjustment of the active length of a balance spring (5), for an oscillator (4, 5) of the balance/balance spring type, comprising a regulator (14) mounted on a plate (13) of a timepiece movement (2), by means of a cock (12) in which a balance (4) staff (7) pivots, the balance spring (5) comprising an inner end integral with the balance (4) staff (7) and an outer end integral with a balance spring stud (8) attached to a stud holder (10), the stud holder (10) being pivotally mounted on the cock (12) concentrically to the balance (4) staff (7), the regulator (14) being pivotally mounted on the stud holder (10) concentrically to the balance (4) staff (7) and characterized in that the device further includes:
    - a pivot arm (16) and means (18) for adjusting the active length of the balance spring (5) by pivoting the regulator (14);
    - elastic stress means (20) configured to exert an elastic, return-to-position action on the regulator (14);
    - an inertia block (22) mounted for free rotation on the cock (12) and connected to the pivot arm (16) of the regulator (14) such that a rotation of the inertia block (22) causes a displacement of the pivot arm (16) of the regulator (14) and simultaneously acts on the means (18) for adjusting the active length of the balance spring (5).
  2. Device (6) for autonomous adjustment of the active length of a balance spring (5), for an oscillator (4, 5) of the balance/balance spring type, comprising a regulator (14) mounted on a plate (13) of a timepiece movement (2), by means of a cock (12) in which a balance (4) staff (7) pivots, the balance spring (5) comprising an inner end integral with the balance (4) staff (7) and an outer end integral with a balance spring stud (8) attached to a stud holder (10), the stud holder (10) being pivotally mounted on the cock (12) concentrically to the balance (4) staff (7), the regulator (14) being pivotally mounted on the stud holder (10) concentrically to the balance (4) staff (7) and characterized in that the device further includes:
    - a pivot arm (16) and means (18) for adjusting the active length of the balance spring (5) by pivoting the regulator (14);
    - elastic stress means (20) configured to exert an elastic, return-to-position action on the regulator (14);
    - an inertia block (22) mounted for free rotation on the plate (13) and connected to the pivot arm (16) of the regulator (14) such that a rotation of the inertia block (22) causes a displacement of the pivot arm (16) of the regulator (14) and simultaneously acts on the means (18) for adjusting the active length of the balance spring (5).
  3. Device (6) for autonomous adjustment of the active length of a balance spring (5) according to claim 1 or 2, characterized in that the device further includes a cam (24) for driving the pivot arm (16) of the regulator (14), said cam (24) being integral with the inertia block (22) and in contact with the pivot arm (16).
  4. Device (6) for autonomous adjustment of the active length of a balance spring (5) according to claim 3, characterized in that the inertia block (22) is mounted for free rotation on the cock (12) via an arbor (38) integral with the inertia block (22), the cam (24) being mounted on the inertia block (22) concentrically to said arbor (38) and integral with said arbor (38).
  5. Device (6) for autonomous adjustment of the active length of a balance spring (5) according to claim 3 or 4, characterized in that the cam (24) is a radial cam with a shaped outer circumference.
  6. Device (6) for autonomous adjustment of the active length of a balance spring (5) according to any of claims 3 to 5, characterized in that, in the rest position of the device (6), a flat portion (40) of the cam (24) is in contact with the pivot arm (16) of the regulator (14), and, in the correction position of the device (6), a corner or an angle (42) of the cam (24) is in contact with the pivot arm (16).
  7. Device (6) for autonomous adjustment of the active length of a balance spring (5) according to any of claims 3 to 6, characterized in that the cam (24) is in contact with the pivot arm (16) of the regulator (14) regardless of the position of the inertia block (22).
  8. Device (6) for autonomous adjustment of the active length of a balance spring (5) according to any of the preceding claims, characterized in that the elastic stress means (20) include an elastically deformable arm (30), with a first end (32a) of the arm resting against a part (34) integral with the cock (12) and a second end (32b) of the arm (30) being attached to the regulator (14).
  9. Device (6) for autonomous adjustment of the active length of a balance spring (5) according to claim 8, characterized in that the regulator (14), the pivot arm (16) and the elastically deformable arm (30) together form one piece.
  10. Device (6) for autonomous adjustment of the active length of a balance spring (5) according to any of the preceding claims, characterized in that the device further includes means (26) for adjusting the elastic stress defined by the elastic stress means (20).
  11. Device (6) for autonomous adjustment of the active length of a balance spring (5) according to any of the preceding claims, characterized in that the means (18) for adjusting the active length of the balance spring (5) include two pins (19) attached to the regulator (14), the balance spring (5) being arranged such that an outer coil (21) of the balance spring (5) passes between the two pins (19).
  12. Device (6) for autonomous adjustment of the active length of a balance spring (5) according to any of the preceding claims, characterized in that the device further includes shock absorption means (28), arranged on the regulator (14) and at least partially resting on the balance (4) staff (7).
  13. Device (6) for autonomous adjustment of the active length of a balance spring (5) according to any of the preceding claims, characterized in that the inertia block (22) is a half-solid disc.
  14. Device (6) for autonomous adjustment of the active length of a balance spring (5) according to any of claims 1 to 11, characterized in that the inertia block (22) is a solid bimaterial disc, the two materials having distinct densities.
  15. Timepiece movement (2) comprising an oscillator (4, 5) of the balance/balance spring type and a device (6) for adjusting the active length of the balance spring (5), characterized in that the autonomous adjustment device (6) is a device according to any of the preceding claims.
  16. Timepiece (1) comprising a timepiece movement (2), characterized in that the timepiece movement (2) is a movement according to claim 15.
EP17208988.0A 2017-12-20 2017-12-20 Standalone device for adjusting the active length of a hairspring Active EP3502788B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CH01574/17A CH714480A2 (en) 2017-12-20 2017-12-20 Autonomous adjustment device for the active length of a hairspring.
EP17208988.0A EP3502788B1 (en) 2017-12-20 2017-12-20 Standalone device for adjusting the active length of a hairspring
JP2018221969A JP6688371B2 (en) 2017-12-20 2018-11-28 Device that autonomously adjusts the effective length of the balance spring
CN201811492233.2A CN109991826B (en) 2017-12-20 2018-12-07 Device for automatically adjusting the effective length of a balance spring
US16/221,664 US11397410B2 (en) 2017-12-20 2018-12-17 Device for autonomous adjustment of the active length of a balance spring

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17208988.0A EP3502788B1 (en) 2017-12-20 2017-12-20 Standalone device for adjusting the active length of a hairspring

Publications (2)

Publication Number Publication Date
EP3502788A1 EP3502788A1 (en) 2019-06-26
EP3502788B1 true EP3502788B1 (en) 2021-03-17

Family

ID=60702388

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17208988.0A Active EP3502788B1 (en) 2017-12-20 2017-12-20 Standalone device for adjusting the active length of a hairspring

Country Status (5)

Country Link
US (1) US11397410B2 (en)
EP (1) EP3502788B1 (en)
JP (1) JP6688371B2 (en)
CN (1) CN109991826B (en)
CH (1) CH714480A2 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3839656B1 (en) * 2019-12-18 2023-12-13 Nivarox-FAR S.A. Horological balance
JP6751215B1 (en) * 2020-03-02 2020-09-02 セイコーウオッチ株式会社 Balance wheel setting mechanism, clock movement and clock
CN112327590B (en) * 2020-10-28 2021-08-20 深圳市格雅表业有限公司 Balance wheel mechanism and movement applying same

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CH705605B1 (en) 2011-10-14 2016-10-14 Frederique Constant S A Device for adjusting the active length of a hairspring.
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Also Published As

Publication number Publication date
CN109991826B (en) 2021-03-05
CH714480A2 (en) 2019-06-28
JP6688371B2 (en) 2020-04-28
US11397410B2 (en) 2022-07-26
JP2019113535A (en) 2019-07-11
US20190187618A1 (en) 2019-06-20
CN109991826A (en) 2019-07-09
EP3502788A1 (en) 2019-06-26

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