EP2874019A1 - End curve for a spiral driven by the outer end thereof - Google Patents

End curve for a spiral driven by the outer end thereof Download PDF

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Publication number
EP2874019A1
EP2874019A1 EP20130193032 EP13193032A EP2874019A1 EP 2874019 A1 EP2874019 A1 EP 2874019A1 EP 20130193032 EP20130193032 EP 20130193032 EP 13193032 A EP13193032 A EP 13193032A EP 2874019 A1 EP2874019 A1 EP 2874019A1
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EP
European Patent Office
Prior art keywords
hairspring
spiral
curve
outer end
center
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.)
Granted
Application number
EP20130193032
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German (de)
French (fr)
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EP2874019B1 (en
Inventor
Mathieu Barraud
Maxime Danielou
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Richemont International SA
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Richemont International SA
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Priority to EP13193032.3A priority Critical patent/EP2874019B1/en
Publication of EP2874019A1 publication Critical patent/EP2874019A1/en
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Publication of EP2874019B1 publication Critical patent/EP2874019B1/en
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    • 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
    • G04B17/066—Manufacture of the spiral spring
    • 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
    • G04B17/32—Component parts or constructional details, e.g. collet, stud, virole or piton
    • G04B17/34—Component parts or constructional details, e.g. collet, stud, virole or piton for fastening the hairspring onto the balance

Definitions

  • the present invention relates to a spiral spring intended to be included in a regulating member with a pendulum of a watch movement.
  • the invention also relates to a regulating member comprising the spiral spring and a watch movement comprising the regulating member.
  • the mechanical regulating members comprise a pendulum driven on a rotating axis and a spiral whose contractions determine the running of the watch.
  • the inner end of the spiral is integrally connected to the axis of the balance beam through the ferrule.
  • the outer end of the hairspring is itself integrally linked to the plate or the pendulum bridge through a peg.
  • shock absorbers are generally used such as Incablocs® systems which absorb axial shocks on the axis of the balance, while allowing rotation with less friction. These shock absorbers however increase the regulating organ and increase its complexity and difficulty of assembly.
  • the axis of the pendulum is generally linked to a pendulum bridge that increases the thickness of movement.
  • Requirement EP1605322 discloses a regulating member in which the inner end of the hairspring is connected to the axis of the balance beam through a ferrule free to move axially along this axis. This solution does not solve the problem of isochronism mentioned.
  • Requirement EP2063325 by the present applicant discloses a regulating member with a balance and a double spiral, wherein the outer end of each spiral is integral with the balance, and the inner end of each spiral is secured to a fixed point of the movement, for example a fixed axis.
  • the outer end of each hairspring includes a 90 ° elbow.
  • An object of the present invention is to provide a spiral spring free of the limitations of the state of the art.
  • a spiral spring intended to be included in a regulating member with a pendulum of a watch movement and comprising an inner end, a terminal curve and an outer end; the inner end of the spiral being secured to a fixed point of the movement; the outer end of the hairspring being integral with the balance so that the hairspring can be driven by its outer end; and the terminal curve extending above the plane of the hairspring from the outer turn thereof and having a shape to match the position of the center of gravity of the hairspring with its center of rotation.
  • the terminal curve comprises a first portion having a first radius of curvature and a second portion having a second radius of curvature inverted with respect to the first radius of curvature.
  • the terminal curve further comprises a rectilinear bonding zone between the two portions.
  • the invention also relates to a regulating member comprising the spiral spring and a watch movement comprising the regulating member.
  • This solution has the advantage over the prior art to allow a concentric deployment of the hairspring during training by the outer end, the center of gravity of the hairspring remaining close to the center of rotation of the hairspring.
  • the shape of the terminal curve makes it possible to produce a regulating organ offering a very good isochronism.
  • the use of a fixed axis makes it possible to eliminate the shock absorbers and the balance bridge.
  • the manufacture of the hairspring of the invention does not pose more constraints than the manufacture of a conventional terminal curve hairspring.
  • a spiral spring 1 clock (or spiral) according to the invention comprises a spiral plane portion 10 and a raised end curve 3 extending outside (above or below) of the spiral plane portion 2 from a point 11 of the outer turn 8 of this spiral plane portion 2.
  • the hairspring 1 with its end curve 3 can be obtained by deformation of the outer turn 8 of an initial planar hairspring.
  • an inner end 2 of the hairspring 1 is intended to be secured to a fixed point of the movement and a outer end 4 of the hairspring 1 is intended to be secured to a rocker arm of a regulating member of a mechanical watch movement.
  • end of the hairspring may include the end curve 3 or generally the entire portion at each end of the hairspring 1 whose deformation is negligible compared to that of the entire hairspring, for example the last turn at each end of the hairspring.
  • the figure 2 represents a top view of a rocker 5 comprising the spiral spring 1 according to the invention.
  • the inner end 2 of the hairspring 1 is fixed to a fixed axis 7 of the rocker 1, for example, by means of a shell 70.
  • the rocker 5 is configured to to be rotatable about the fixed axis 7 relative to the movement of the watch, for example, with respect to a plate (not shown).
  • the lateral and axial guidance of the balance 5 on the axis 7 can be provided by guide elements (not shown) integral with the balance.
  • the axis 7 being fixed, shock absorbers are not necessary.
  • the other elements of the regulating organ are conventional and are not represented. It is however admitted that the balance is set in motion, for example, thanks to the energy provided by an escape wheel and an escapement anchor (not shown).
  • the outer end 4 of the hairspring is secured to the rocker 5 so that the hairspring can be driven by its outer end.
  • the outer end 4 is fixed to the rocker 5 at a point of attachment 12 located on one of the arms 50 of the beam.
  • the attachment point 12 could also be located on a wheel 51 of the balance. Note however that it is also possible to use a rotary axis, for example the axis of the balance, and to fix the inner end 2 of the balance 1 to another point by means of a peak and a bridge (not shown).
  • the shape of the end curve 3 is determined so that the center of gravity of the hairspring 1 is permanently substantially coincident with the center of rotation 9, so that the turns of the spiral plane portion 2 of the hairspring 1 deform concentrically during oscillations. of the last.
  • center of gravity of the hairspring 1, in fact means the center of gravity of the elastic portion of the hairspring 1.
  • the center of gravity in the sense of the invention is a center of deformation.
  • the spiral spring 1 comprises a terminal curve 3 which extends out of the plane of the spiral from the outer coil 8 thereof and whose shape is chosen to change the position of the center of gravity of the spiral 1 and make it coincide with
  • the shape of the end curve 3 satisfies the Phillips condition, that is to say, the shape of the end curve 3 makes it possible to reduce the center of gravity of the spiral 1 to the axis 7 (coinciding with its center of rotation 9) while having an attachment point 12 located at a radius (from this center of rotation) large enough to let the hairspring 1 operate freely.
  • the point of attachment 12 is preferably at a radius which is much greater than the radius of the last turn of the spiral plane portion 10
  • the terminal curve 3 contributes to the elastic deformations of the spring 1 and allows the latter to deform concentrically during its operation. It consists of circular and / or rectilinear segments and is obtained by permanent deformation of the outer turn 8 of the initial planar spiral 2.
  • the terminal curve 3 takes the form of an "S" curve.
  • the terminal curve 3 in "S" may comprise a first portion 31 having a first radius of curvature and a second portion 32 having a second radius of curvature inverted with respect to the first radius of curvature.
  • the terminal curve 3 may also comprise a rectilinear connection zone between the two portions 31, 32.
  • the torque created by the first and second curvatures 31, 32 compensates for the natural deployment of the hairspring 1 opposite the attachment point 12 so that the center of gravity of the hairspring 1 remains very close to its center of rotation.
  • the position of the center of gravity has been measured, and the inventors have found that it has a variation of the order of 1 ⁇ m relative to the center of rotation 9 of the spiral 1.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Springs (AREA)

Abstract

Ressort spiral (1) destiné à être compris dans un organe réglant avec un balancier (5) d'un mouvement de montre et comprenant une extrémité intérieure (2), une courbe terminale (3) et une extrémité extérieure (4); l'extrémité intérieure (2) du spiral (1) étant solidaire d'un point fixe (6) du mouvement; l'extrémité extérieure (4) du spiral (1) étant solidaire du balancier (5) de sorte que le spiral peut être entraîné par son extrémité extérieure; la courbe terminale (3) s'étendant en dehors du plan du spiral depuis la spire extérieure (8) de celui-ci et ayant une forme permettant de faire coïncider la position du centre de gravité du spiral (1) avec son centre de rotation (9). Le ressort spiral de l'invention permet un déploiement concentrique du spiral lors de l'entrainement par l'extrémité extérieure et de réaliser un organe réglant offrant un très bon isochronisme.Spiral spring (1) intended to be included in a regulating member with a balance (5) of a watch movement and comprising an inner end (2), an end curve (3) and an outer end (4); the inner end (2) of the hairspring (1) being integral with a fixed point (6) of the movement; the outer end (4) of the hairspring (1) being integral with the rocker arm (5) so that the hairspring can be driven by its outer end; the end curve (3) extending out of the plane of the hairspring from the outer turn (8) thereof and having a shape to make coincide the position of the center of gravity of the hairspring (1) with its center of rotation (9). The spiral spring of the invention allows a concentric deployment of the spiral during training by the outer end and to achieve a regulating member offering a very good isochronism.

Description

Domaine techniqueTechnical area

La présente invention concerne un ressort spiral destiné à être compris dans un organe réglant avec un balancier d'un mouvement de montre. L'invention concerne également un organe réglant comprenant le ressort spiral et un mouvement de montre comprenant l'organe réglant.The present invention relates to a spiral spring intended to be included in a regulating member with a pendulum of a watch movement. The invention also relates to a regulating member comprising the spiral spring and a watch movement comprising the regulating member.

Etat de la techniqueState of the art

Les organes réglant mécaniques comportent un balancier chassé sur un axe tournant et un spiral dont les contractions déterminent la marche de la montre. L'extrémité intérieure du spiral est liée solidairement à l'axe du balancier au travers de la virole. L'extrémité extérieure du spiral est quant à elle liée solidairement à la platine ou au pont de balancier au travers d'un piton.The mechanical regulating members comprise a pendulum driven on a rotating axis and a spiral whose contractions determine the running of the watch. The inner end of the spiral is integrally connected to the axis of the balance beam through the ferrule. The outer end of the hairspring is itself integrally linked to the plate or the pendulum bridge through a peg.

Cet arrangement traditionnel est cependant néfaste pour la précision et l'isochronisme de la montre. En effet, on sait que le centre de gravité du spiral se déplace lorsque le spiral s'enroule et se déroule autour de l'axe. Le spiral s'enroule et se déroule donc en se déformant de façon excentrique par rapport a l'axe de balancier pendant son fonctionnement. Ce déplacement produit le même effet qu'un balourd du balancier et engendre une fluctuation indésirable du couple appliqué à l'axe du balancier. Pour remédier à cette imprécision, les spiraux comportent souvent une queue extérieure dont la forme est calculée afin de maintenir le centre de gravité du spiral sur l'axe du spiral. Le ressort étant flexible, la correction ne s'applique cependant pas de la même façon sur toutes les spires du ressort dont la forme en spirale tend à se déformer. Une correction importante est appliquée sur les spires externes, tandis que les spires internes qui agissent plus directement sur l'axe du balancier sont moins affectées. Par conséquent, le couple appliqué sur l'axe central varie et l'isochronisme n'est pas parfait.This traditional arrangement, however, is detrimental to the precision and isochronism of the watch. Indeed, it is known that the center of gravity of the spiral moves as the spiral winds and unwinds around the axis. The hairspring rolls up and thus unrolls eccentrically with respect to the pendulum axis during operation. This displacement produces the same effect as an unbalance of the balance and generates an undesirable fluctuation of the torque applied to the axis of the balance. To remedy this inaccuracy, the spirals often have an outer tail whose shape is calculated to maintain the center of gravity of the spiral on the axis of the spiral. As the spring is flexible, the correction does not apply in the same way on all turns of the spring whose spiral shape tends to deform. A large correction is applied on the outer turns, while the inner turns that act more directly on the axis of the balance are less affected. Consequently, the torque applied on the central axis varies and the isochronism is not perfect.

En utilisant une courbe de type Breguet sur l'extrémité extérieure d'un spiral, voire où cette courbe terminale est réalisée au-dessus du plan principal du spiral, on peut obtenir un spiral qui fonctionne généralement de manière concentrique, mais le point de pitonnage d'un tel spiral ne se situe pas à un rayon suffisamment grand pour ne pas perturber le fonctionnement libre du spiral.By using a Breguet type curve on the outer end of a hairspring, or even where this terminal curve is made above the main plane of the hairspring, it is possible to obtain a hairspring which generally functions in a concentric manner, but the pegging point such a hairspring is not at a radius large enough not to disturb the free operation of the hairspring.

D'autre part, d'éventuels chocs impartis au mouvement sont transmis à la masse importante du balancier au travers de son axe central. Pour amortir ces chocs, des éléments amortisseurs doivent être prévus. A cet effet, on emploie généralement des amortisseurs de choc tels que les systèmes Incablocs® qui permettent d'absorber les chocs axiaux sur l'axe du balancier, tout en permettant une rotation avec un frottement moindre. Ces amortisseurs de choc renchérissent cependant l'organe réglant et augmentent sa complexité et la difficulté du montage.On the other hand, any shocks imparted to the movement are transmitted to the large mass of the balance through its central axis. To dampen these shocks, damping elements must be provided. For this purpose, shock absorbers are generally used such as Incablocs® systems which absorb axial shocks on the axis of the balance, while allowing rotation with less friction. These shock absorbers however increase the regulating organ and increase its complexity and difficulty of assembly.

Enfin, l'axe du balancier est généralement lié à un pont de balancier qui augmente l'épaisseur de mouvement.Finally, the axis of the pendulum is generally linked to a pendulum bridge that increases the thickness of movement.

La demande EP1605322 décrit un organe réglant dans lequel l'extrémité intérieure du spiral est liée à l'axe du balancier au travers d'une virole libre de se déplacer axialement le long de cet axe. Cette solution ne résout pas le problème d'isochronisme mentionné.Requirement EP1605322 discloses a regulating member in which the inner end of the hairspring is connected to the axis of the balance beam through a ferrule free to move axially along this axis. This solution does not solve the problem of isochronism mentioned.

La demande EP2063325 par la présente demanderesse divulgue un organe réglant avec un balancier et un spiral double, dans lequel l'extrémité extérieure de chaque spiral est solidaire du balancier, et l'extrémité intérieure de chaque spiral est solidaire d'un point fixe du mouvement, par exemple d'un axe fixe. L'extrémité extérieure de chaque spiral comprend un coude à 90°.Requirement EP2063325 by the present applicant discloses a regulating member with a balance and a double spiral, wherein the outer end of each spiral is integral with the balance, and the inner end of each spiral is secured to a fixed point of the movement, for example a fixed axis. The outer end of each hairspring includes a 90 ° elbow.

L'usage d'un axe fixe permet de supprimer les amortisseurs de choc et le pont de balancier. D'autre part, les perturbations de l'isochronisme sont dans une large mesure évitées, puisque la correction de la position du centre de gravité provoquée par la queue du spiral est appliquée près du point de fixation au balancier. Dans la solution divulguée dans EP2063325 , cependant, le centre de gravité de chaque spiral reste loin de l'axe de rotation et le couple induit par le coude à angle droit font que le déploiement du spiral en fonctionnement est non concentrique. Il peut même se produire un déplacement du centre de gravité du spiral lors de son fonctionnement. C'est pourquoi la solution de la demande EP2063325 comprend deux spiraux concentriques identiques dont les extrémités extérieures sont fixées à 180 degrés l'un de l'autre. L'incorporation d'un tel spiral double augment cependant la complexité et le coût de l'organe réglant d'une manière importante.The use of a fixed axis makes it possible to eliminate the shock absorbers and the balance bridge. On the other hand, the disturbances of the isochronism are largely avoided, since the correction of the position of the center of gravity caused by the tail of the hairspring is applied near the point of attachment to the balance. In the solution disclosed in EP2063325 however, the center of gravity of each hairspring remains far from the axis of rotation and the torque induced by the elbow at right angles makes the deployment of the hairspring in operation non-concentric. There may even be a shift in the center of gravity of the hairspring during operation. That's why the demand solution EP2063325 comprises two identical concentric spirals whose outer ends are fixed at 180 degrees to one another. The incorporation of such a double spiral however increases the complexity and the cost of the regulating organ in a significant way.

Bref résumé de l'inventionBrief summary of the invention

Un but de la présente invention est de proposer un ressort spiral exempt des limitations de l'état de la technique.An object of the present invention is to provide a spiral spring free of the limitations of the state of the art.

Selon l'invention, ces buts sont atteints notamment au moyen d'un ressort spiral destiné à être compris dans un organe réglant avec un balancier d'un mouvement de montre et comprenant une extrémité intérieure, une courbe terminale et une extrémité extérieure; l'extrémité intérieure du spiral étant solidaire d'un point fixe du mouvement; l'extrémité extérieure du spiral étant solidaire du balancier de sorte que le spiral peut être entraîné par son extrémité extérieure; et la courbe terminale s'étendant au-dessus du plan du spiral depuis la spire extérieure de celui-ci et ayant une forme permettant de faire coïncider la position du centre de gravité du spiral avec son centre de rotation.According to the invention, these objects are achieved in particular by means of a spiral spring intended to be included in a regulating member with a pendulum of a watch movement and comprising an inner end, a terminal curve and an outer end; the inner end of the spiral being secured to a fixed point of the movement; the outer end of the hairspring being integral with the balance so that the hairspring can be driven by its outer end; and the terminal curve extending above the plane of the hairspring from the outer turn thereof and having a shape to match the position of the center of gravity of the hairspring with its center of rotation.

Dans un mode de réalisation, la courbe terminale comprend une première portion ayant un premier rayon de courbure et une seconde portion ayant un second rayon de courbure inversé par rapport au premier rayon de courbure.In one embodiment, the terminal curve comprises a first portion having a first radius of curvature and a second portion having a second radius of curvature inverted with respect to the first radius of curvature.

Dans un autre mode de réalisation, la courbe terminale comprend en outre une zone de liaison rectiligne entre les deux portions.In another embodiment, the terminal curve further comprises a rectilinear bonding zone between the two portions.

L'invention concerne également un organe réglant comprenant le ressort spiral et un mouvement de montre comprenant l'organe réglant.The invention also relates to a regulating member comprising the spiral spring and a watch movement comprising the regulating member.

Cette solution présente notamment l'avantage par rapport à l'art antérieur de permettre un déploiement concentrique du spiral lors de l'entrainement par l'extrémité extérieure, le centre de gravité du spiral restant proche du centre de rotation du spiral. La forme de la courbe terminale permet de réaliser un organe réglant offrant un très bon isochronisme. D'autre part, l'usage d'un axe fixe permet de supprimer les amortisseurs de choc et le pont de balancier. La fabrication du spiral de l'invention ne pose pas plus de contraintes que la fabrication d'un spiral à courbe terminale conventionnelle.This solution has the advantage over the prior art to allow a concentric deployment of the hairspring during training by the outer end, the center of gravity of the hairspring remaining close to the center of rotation of the hairspring. The shape of the terminal curve makes it possible to produce a regulating organ offering a very good isochronism. On the other hand, the use of a fixed axis makes it possible to eliminate the shock absorbers and the balance bridge. The manufacture of the hairspring of the invention does not pose more constraints than the manufacture of a conventional terminal curve hairspring.

Brève description des figuresBrief description of the figures

Des exemples de mise en oeuvre de l'invention sont indiqués dans la description illustrée par les figures annexées dans lesquelles:

  • la figure 1 illustre une vue du dessus d'un ressort spiral pour un organe réglant d'un mouvement de montre, selon l'invention;
  • la figure 2 représente une vue du dessus d'un balancier comprenant le ressort spiral selon un mode de réalisation; et
  • la figure3 représente un spiral plat conventionnel.
Examples of implementation of the invention are indicated in the description illustrated by the appended figures in which:
  • the figure 1 illustrates a top view of a spiral spring for a regulating member of a watch movement, according to the invention;
  • the figure 2 represents a top view of a balance comprising the spiral spring according to one embodiment; and
  • the Figure 3 represents a conventional flat hairspring.

Exemple(s) de mode de réalisation de l'inventionExample (s) of embodiment of the invention

En référence à la figure 1, un ressort-spiral 1 d'horlogerie (ou spiral) selon l'invention comprend une partie plane en spirale 10 et une courbe terminale levée 3 s'étendant en dehors (au-dessus ou en dessous) de la partie plane en spirale 2 depuis un point 11 de la spire extérieure 8 de cette partie plane en spirale 2. Le spiral 1 avec sa courbe terminale 3 peut être obtenu par déformation de la spire extérieure 8 d'un spiral plan initial.With reference to the figure 1 , a spiral spring 1 clock (or spiral) according to the invention comprises a spiral plane portion 10 and a raised end curve 3 extending outside (above or below) of the spiral plane portion 2 from a point 11 of the outer turn 8 of this spiral plane portion 2. The hairspring 1 with its end curve 3 can be obtained by deformation of the outer turn 8 of an initial planar hairspring.

Selon une forme d'exécution, une extrémité intérieure 2 du spiral 1 est destinée à être fixée solidaire à un point fixe du mouvement et une extrémité extérieure 4 du spiral 1 est destinée à être fixée solidaire d'un balancier d'un organe réglant d'un mouvement de montre mécanique.According to one embodiment, an inner end 2 of the hairspring 1 is intended to be secured to a fixed point of the movement and a outer end 4 of the hairspring 1 is intended to be secured to a rocker arm of a regulating member of a mechanical watch movement.

Dans le présent texte, l'expression " extrémité du spiral " peut englober la courbe terminale 3 ou de manière générale toute la portion à chaque bout du spiral 1 dont la déformation est négligeable par rapport à celle de l'ensemble du spiral, par exemple la dernière spire à chaque extrémité du spiral.In the present text, the term "end of the hairspring" may include the end curve 3 or generally the entire portion at each end of the hairspring 1 whose deformation is negligible compared to that of the entire hairspring, for example the last turn at each end of the hairspring.

La figure 2 représente une vue du dessus d'un balancier 5 comprenant le ressort spiral 1 selon l'invention. Dans la forme d'exécution illustrée, l'extrémité intérieure 2 du spiral 1 est fixée à un axe fixe 7 du balancier 1, par exemple, par l'intermédiaire d'une virole 70. Dans cette configuration, le balancier 5 est configuré pour pouvoir tourner autour de l'axe fixe 7 par rapport au mouvement de la montre, par exemple, par rapport à une platine (non représentée). Dans une telle configuration, le guidage latéral et axial du balancier 5 sur l'axe 7 peut être assuré par des éléments de guidage (non représentés) solidaires du balancier. L'axe 7 étant fixe, des amortisseurs de choc ne sont pas nécessaires. Dans la figure 2, les autres éléments de l'organe réglant sont conventionnels et ne sont pas représentés. Il est cependant admis que le balancier est mis en mouvement, par exemple, grâce à l'énergie apportée par une roue d'échappement et une ancre d'échappement (non représentés).The figure 2 represents a top view of a rocker 5 comprising the spiral spring 1 according to the invention. In the illustrated embodiment, the inner end 2 of the hairspring 1 is fixed to a fixed axis 7 of the rocker 1, for example, by means of a shell 70. In this configuration, the rocker 5 is configured to to be rotatable about the fixed axis 7 relative to the movement of the watch, for example, with respect to a plate (not shown). In such a configuration, the lateral and axial guidance of the balance 5 on the axis 7 can be provided by guide elements (not shown) integral with the balance. The axis 7 being fixed, shock absorbers are not necessary. In the figure 2 the other elements of the regulating organ are conventional and are not represented. It is however admitted that the balance is set in motion, for example, thanks to the energy provided by an escape wheel and an escapement anchor (not shown).

L'extrémité extérieure 4 du spiral est solidaire du balancier 5 de sorte que le spiral peut être entraîné par son extrémité extérieure. Dans la forme de réalisation illustrée à la figure 2, l'extrémité extérieure 4 est fixée au balancier 5 au niveau d'un point d'attache 12 situé sur l'un des bras 50 du balancier. Le point d'attache 12 pourrait également être situé sur un volant 51 du balancier. Notons qu'il est cependant aussi possible d'employer un axe rotatif, par exemple l'axe du balancier, et de fixer l'extrémité intérieure 2 du spiral 1 à un autre point au moyen d'un piton et d'un pont (non représentés).The outer end 4 of the hairspring is secured to the rocker 5 so that the hairspring can be driven by its outer end. In the embodiment illustrated in figure 2 , the outer end 4 is fixed to the rocker 5 at a point of attachment 12 located on one of the arms 50 of the beam. The attachment point 12 could also be located on a wheel 51 of the balance. Note however that it is also possible to use a rotary axis, for example the axis of the balance, and to fix the inner end 2 of the balance 1 to another point by means of a peak and a bridge ( not shown).

La forme de la courbe terminale 3 est déterminée pour que le centre de gravité du spiral 1 soit en permanence sensiblement confondu avec le centre de rotation 9, afin que les spires de la partie plane en spirale 2 du spiral 1 se déforment concentriquement pendant les oscillations de ce dernier. Par « centre de gravité » du spiral 1, on entend en fait le centre de gravité de la partie élastique du spiral 1. Le centre de gravite au sens de l'invention est un centre de déformation.The shape of the end curve 3 is determined so that the center of gravity of the hairspring 1 is permanently substantially coincident with the center of rotation 9, so that the turns of the spiral plane portion 2 of the hairspring 1 deform concentrically during oscillations. of the last. By "center of gravity" of the hairspring 1, in fact means the center of gravity of the elastic portion of the hairspring 1. The center of gravity in the sense of the invention is a center of deformation.

Le ressort spiral 1 comprend une courbe terminale 3 qui s'étend en dehors du plan du spiral depuis la spire extérieure 8 de celui-ci et dont la forme est choisie pour modifier la position du centre de gravite du spiral 1 et la faire coïncider avec son centre de rotation 9. En particulier, la forme de la courbe terminale 3 permet de satisfaire la condition de Phillips, c'est-à-dire, la forme de la courbe terminale 3 permet de ramener le centre de gravité du spiral 1 sur l'axe 7 (coïncidant avec son centre de rotation 9) tout en ayant un point d'attache 12 situé à un rayon (à partir de ce centre de rotation) suffisamment grand pour laisser le spiral 1 fonctionner librement. En particulier, on voit sur la figure 2 que le point d'attache 12 se trouve de préférence à un rayon qui est largement plus important que le rayon de la dernière spire de la partie plane en spirale 10The spiral spring 1 comprises a terminal curve 3 which extends out of the plane of the spiral from the outer coil 8 thereof and whose shape is chosen to change the position of the center of gravity of the spiral 1 and make it coincide with In particular, the shape of the end curve 3 satisfies the Phillips condition, that is to say, the shape of the end curve 3 makes it possible to reduce the center of gravity of the spiral 1 to the axis 7 (coinciding with its center of rotation 9) while having an attachment point 12 located at a radius (from this center of rotation) large enough to let the hairspring 1 operate freely. In particular, we see on the figure 2 that the point of attachment 12 is preferably at a radius which is much greater than the radius of the last turn of the spiral plane portion 10

La courbe terminale 3 participe aux déformations élastiques du spiral 1 et permet à ce dernier de se déformer concentriquement lors de son fonctionnement. Elle est constituée de segments circulaires et/ou rectilignes et est obtenue par déformation permanente de la spire extérieure 8 du spiral plan 2 initial.The terminal curve 3 contributes to the elastic deformations of the spring 1 and allows the latter to deform concentrically during its operation. It consists of circular and / or rectilinear segments and is obtained by permanent deformation of the outer turn 8 of the initial planar spiral 2.

Dans le mode préféré de réalisation illustré aux figures 1 et 2, la courbe terminale 3 prend la forme d'une courbe en « S ».In the preferred embodiment illustrated in Figures 1 and 2 , the terminal curve 3 takes the form of an "S" curve.

La courbe terminale 3 en « S » peut comprendre une première portion 31 ayant un premier rayon de courbure et une seconde portion 32 ayant un second rayon de courbure inversé par rapport au premier rayon de courbure. La courbe terminale 3 peut également comprendre une zone de liaison rectiligne entre les deux portions 31, 32.The terminal curve 3 in "S" may comprise a first portion 31 having a first radius of curvature and a second portion 32 having a second radius of curvature inverted with respect to the first radius of curvature. The terminal curve 3 may also comprise a rectilinear connection zone between the two portions 31, 32.

En fonctionnement, le couple créé par les première et seconde courbures 31, 32 compense le déploiement naturel du spiral 1 à l'opposé du point d'attache 12 de sorte que le centre de gravité du spiral 1 reste très proche de son centre de rotation 9. Par exemple, lors du fonctionnement du spiral 1 ayant la courbe terminale 3 en « S », tel qu'illustré aux figures 1 et 2, la position du centre de gravité a été mesurée, et les inventeurs ont trouvé qu'il a une variation de l'ordre de 1 µm par rapport au centre de rotation 9 du spiral 1. A titre comparatif, dans le cas d'un spiral plat conventionnel dont la courbe terminale 3 est coudée et dans le même plan que la partie plane 10 du spirale 1 (voir figure 3), la position du centre de gravité a une variation qui est plutôt de l'ordre de 10-100 µm par rapport au centre de rotation 9 du spiral.In operation, the torque created by the first and second curvatures 31, 32 compensates for the natural deployment of the hairspring 1 opposite the attachment point 12 so that the center of gravity of the hairspring 1 remains very close to its center of rotation. 9. For example, when operating the hairspring 1 having the terminal curve 3 in "S", as illustrated in FIGS. Figures 1 and 2 the position of the center of gravity has been measured, and the inventors have found that it has a variation of the order of 1 μm relative to the center of rotation 9 of the spiral 1. For comparison, in the case of a conventional flat spiral whose end curve 3 is bent and in the same plane as the flat part 10 of the spiral 1 (see figure 3 ), the position of the center of gravity has a variation which is rather of the order of 10-100 microns relative to the center of rotation 9 of the spiral.

Numéros de référence employés sur les figuresReference numbers used in the figures

11
ressort spiralspiral spring
22
extrémité intérieure du spiralinner end of the hairspring
33
courbe terminale du spiralterminal curve of the spiral
44
extrémité extérieure du spiralouter end of the hairspring
55
balancierpendulum
66
point fixefixed point
77
axeaxis
88
spire extérieureouter turn
99
centre de rotationcenter of rotation
1010
partie plane en spiralespiral flat part
1111
point de la spire extérieurepoint of the outer turn
1212
point d'attacheattachment point
3131
première portionfirst portion
3232
seconde portionsecond portion
5050
brasarms
5151
volantflying
7070
viroleferrule

Claims (9)

Ressort spiral (1) destiné à être compris dans un organe réglant avec un balancier (5) d'un mouvement de montre et comprenant une extrémité intérieure (2), une courbe terminale (3) et une extrémité extérieure (4);
l'extrémité intérieure (2) du spiral (1) étant solidaire d'un point fixe (6) du mouvement;
l'extrémité extérieure (4) du spiral (1) étant solidaire du balancier (5) de sorte que le spiral peut être entraîné par son extrémité extérieure;
caractérisé en ce que
la courbe terminale (3) s'étend en dehors du plan du spiral depuis la spire extérieure (8) de celui-ci et a une forme permettant de faire coïncider la position du centre de gravité du spiral (1) avec son centre de rotation (9).Spiral spring (1) intended to be included in a regulating member with a balance (5) of a watch movement and comprising an inner end (2), an end curve (3) and an outer end (4);
the inner end (2) of the hairspring (1) being integral with a fixed point (6) of the movement;
the outer end (4) of the hairspring (1) being integral with the rocker arm (5) so that the hairspring can be driven by its outer end;
characterized in that
the end curve (3) extends out of the plane of the hairspring from the outer turn (8) thereof and has a shape to make coincide the position of the center of gravity of the hairspring (1) with its center of rotation (9). Ressort spiral (1) selon la revendication 1,
dans lequel la courbe terminale (3) comprend une première portion (31) ayant un premier rayon de courbure et une seconde portion (32) ayant un second rayon de courbure inversé par rapport au premier rayon de courbure.Spiral spring (1) according to claim 1,
wherein the terminal curve (3) comprises a first portion (31) having a first radius of curvature and a second portion (32) having a second radius of curvature inverted with respect to the first radius of curvature. Ressort spiral (1) selon la revendication 2,
dans lequel la courbe terminale (3) a la forme d'une courbe en S.Spiral spring (1) according to claim 2,
wherein the terminal curve (3) is in the form of an S-curve. Ressort spiral (1) selon la revendication 2 ou 3,
dans lequel la courbe terminale (3) comprend en outre une zone de liaison rectiligne entre les deux portions (31, 32).Spiral spring (1) according to claim 2 or 3,
wherein the terminal curve (3) further comprises a rectilinear bonding zone between the two portions (31, 32). Organe réglant comprenant un balancier (5) et le ressort spiral (1) selon l'une des revendications 1 à 4.Regulating member comprising a balance (5) and the spiral spring (1) according to one of claims 1 to 4. Organe réglant selon la revendication 5 dans lequel l'axe du balancier (5) est fixe et l'extrémité intérieure (2) du spiral (1) est solidaire de cet axe.Adjusting member according to claim 5 wherein the axis of the balance (5) is fixed and the inner end (2) of the spiral (1) is integral with this axis. Organe réglant selon la revendication 5 ou la revendication 6 dans lequel le point d'attache (12) de l'extrémité extérieure (4) du spiral (1) est situé à un rayon qui est plus important que le rayon de la dernière spire du spiral.Regulating member according to claim 5 or claim 6 wherein the point of attachment (12) of the outer end (4) of the spiral (1) is located at a radius which is greater than the radius of the last turn of the spiral. Organe réglant selon la revendication 7 dans lequel le point d'attache (12) de l'extrémité extérieure (4) du spiral (1) est situé sur un bras du balancier (5).Adjusting member according to claim 7 wherein the point of attachment (12) of the outer end (4) of the spiral (1) is located on an arm of the balance (5). Mouvement de montre comprenant l'organe réglant selon l'une des revendications 5 à 8.Watch movement comprising the regulating member according to one of Claims 5 to 8.
EP13193032.3A 2013-11-15 2013-11-15 End curve for a spiral driven by the outer end thereof Active EP2874019B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
EP13193032.3A EP2874019B1 (en) 2013-11-15 2013-11-15 End curve for a spiral driven by the outer end thereof

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3499318A1 (en) * 2015-12-14 2019-06-19 Novasort SA Oscillator system for a watch

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1540160A (en) * 1967-10-09 1968-09-20 Nationale De Ressorts S A Fab Spiral, especially for clockwork movement
DE6804867U (en) * 1968-10-28 1969-04-17 Pforzheimer Uhren Rohwerke ELECTRICALLY POWERED WATCH, ESPECIALLY. WRISTWATCH
EP1605322A2 (en) 2004-04-08 2005-12-14 Coredem S.A. Connection of the unit virole-spiral to the balance axle for mechanical clockwork
EP2063325A2 (en) 2007-11-20 2009-05-27 Richemont International S.A. Mechanical watch movement
EP2196867A1 (en) * 2008-12-15 2010-06-16 Montres Breguet S.A. Hairspring with curve elevation made from a silicon-based material
CH700260A2 (en) * 2009-01-16 2010-07-30 Cartier Creation Studio Sa Regulating member for mechanical watch, has balance and hairspring forming balance-spiral assembly, where balance is machined using micro-fabrication process to allow machining dimensional tolerance in order of micron

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7112818U (en) * 1971-04-02 1973-04-19 Haas C Coil spring

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1540160A (en) * 1967-10-09 1968-09-20 Nationale De Ressorts S A Fab Spiral, especially for clockwork movement
DE6804867U (en) * 1968-10-28 1969-04-17 Pforzheimer Uhren Rohwerke ELECTRICALLY POWERED WATCH, ESPECIALLY. WRISTWATCH
EP1605322A2 (en) 2004-04-08 2005-12-14 Coredem S.A. Connection of the unit virole-spiral to the balance axle for mechanical clockwork
EP2063325A2 (en) 2007-11-20 2009-05-27 Richemont International S.A. Mechanical watch movement
EP2196867A1 (en) * 2008-12-15 2010-06-16 Montres Breguet S.A. Hairspring with curve elevation made from a silicon-based material
CH700260A2 (en) * 2009-01-16 2010-07-30 Cartier Creation Studio Sa Regulating member for mechanical watch, has balance and hairspring forming balance-spiral assembly, where balance is machined using micro-fabrication process to allow machining dimensional tolerance in order of micron

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3499318A1 (en) * 2015-12-14 2019-06-19 Novasort SA Oscillator system for a watch
US11415941B2 (en) 2015-12-14 2022-08-16 Wcp (Watch Connaisseur Project) Sa Oscillating system for a watch

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