EP2085832B1 - Chronograph device with friction coupling - Google Patents

Chronograph device with friction coupling Download PDF

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Publication number
EP2085832B1
EP2085832B1 EP20080151029 EP08151029A EP2085832B1 EP 2085832 B1 EP2085832 B1 EP 2085832B1 EP 20080151029 EP20080151029 EP 20080151029 EP 08151029 A EP08151029 A EP 08151029A EP 2085832 B1 EP2085832 B1 EP 2085832B1
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EP
European Patent Office
Prior art keywords
coupling
chronograph
spring
arbour
clutch
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EP20080151029
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German (de)
French (fr)
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EP2085832A1 (en
Inventor
M.Edmond Capt
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.)
Blanepain Sa
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Blancpain SA
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Priority to EP20080151029 priority Critical patent/EP2085832B1/en
Publication of EP2085832A1 publication Critical patent/EP2085832A1/en
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04F—TIME-INTERVAL MEASURING
    • G04F7/00—Apparatus for measuring unknown time intervals by non-electric means
    • G04F7/04—Apparatus for measuring unknown time intervals by non-electric means using a mechanical oscillator
    • G04F7/08—Watches or clocks with stop devices, e.g. chronograph
    • 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
    • G04B11/00—Click devices; Stop clicks; Clutches
    • G04B11/001—Clutch mechanism between two rotating members with transfer of movement in both directions, possibly with limitation on the transfer of power
    • G04B11/003—Clutch mechanism between two rotating members with transfer of movement in both directions, possibly with limitation on the transfer of power with friction member, e.g. with spring action

Definitions

  • Any chronograph mechanism is driven by a clockwork movement via a clutch to start and stop this mechanism very quickly, in combination with locking means that keep stopped the chronograph indicators.
  • Two types of clutches are commonly used in chronographs and are distinguished by the direction of movement of the movable member of the clutch.
  • the side clutch system uses a clutch wheel with triangular teeth, carried by a rocker and movable in its own plane, to engage on a toothing at low pitch of the chronograph mobile. Said step is reduced to minimize the small angular jumps that the engagement of the teeth causes on the chronograph mobile and on the second hand. This jump is the main disadvantage of the lateral clutch system.
  • the vertical clutch system uses a friction clutch.
  • a friction clutch For example, a current construction is described in detail in the patent application EP 1791043 and corresponds to the preamble of claim 1 attached hereto.
  • the movable clutch element is a ring that slides axially around the chronograph shaft and has a large collar permanently pushed by a clutch spring bearing on the shaft. The spring tends to press the ring against a wheel constituting the drive plate, with a minimum force sufficient to frictionally transmit the rotation of this plate to the shaft in all operating conditions.
  • a beveled jaw clamp raises the collar and the ring against the thrust of the clutch spring, which frees the rotation of the plate and at the same time frictionally locks the ring, the spring and the tree.
  • the present invention aims to create a new type of chronograph clutch, associated with control means from a column wheel and likely to avoid the aforementioned drawbacks of the prior art.
  • a chronograph control device of the kind indicated in the preamble above characterized in that the clutch comprises a plurality of clutch elements which are arranged to be movable in a radial plane perpendicular to this axis for resiliently applying, under the effect of the clutch spring or springs, against a wall rotatably connected to the drive plate.
  • the device shown in the drawings comprises a chronograph mobile 1 capable of rotating about an axis 2, its central shaft 3 being mounted in a conventional manner in bearings which are not shown here.
  • One end 4 of the shaft 3 carries the seconds hand of the chronograph.
  • the device mainly comprises a column wheel 5 which actuates a clamp 6 and an insulator 7 biased by a spring 8.
  • the column wheel 5, which is of conventional construction of the two-stroke type, is controlled on its toothing 9 by the manual pushbutton START / STOP of the chronograph.
  • a drive plate 10 provided with a pinion 11 is mounted freely rotatably on the shaft 3, between a collar 12 and a ring 13 which retain it axially.
  • the pinion 11 is engaged with a wheel of the watch movement of the chronograph watch, thus permanently rotating the drive plate 10.
  • the latter comprises, in its peripheral region, a cylindrical wall 14 of low height, centered on the axis 2 and defining a cavity above the disc 10.
  • This cavity contains a clutch spring 16 of generally flat shape, disposed in a radial plane 20 (see figure 4 ) and having three curved and flexible arms, which can be seen in the figure 2 .
  • the spring 16 comprises a hub 18 with a central bore, to be mounted rotatably around the collar 12 of the shaft, and three holes 19 equidistant angularly.
  • the arms 17 of the spring also distributed in a symmetry of rotation at 120 degrees from each other about the axis 2, are attached to the hub 18 and each have a rounded end portion serving as a clutch element 22.
  • the outer surface of the clutch member extends in a substantially circumferential direction.
  • These elements 22 tend to elastically bear in the radial direction against the cylindrical wall 14 of the drive plate 10, each arm being prestressed by bending in the radial plane 20 during assembly of the spring.
  • Each clutch member 22 is provided with a control pin 23 extending axially upward in the orientation shown here, i.e. towards the opposite side of the dial.
  • the clutch spring 16 is rotatably attached to a clutch disc 24 placed above it and having three tenons 25 engaged in the holes 19 of the spring 16.
  • the disc 24 is rotatably mounted around the shaft 3 and bears axially against the collar 12 thanks to the axial force of a friction spring 26 of the diaphragm type, bearing against a friction ring 27 fixed to the shaft 3. This force has a minimum value to create a sufficient friction torque to safely drive the chronograph .
  • the disc 24 has a cylindrical periphery 28 against which can be applied symmetrically the two branches 29 of the clamp 6.
  • the disc 24 further comprises three openings 30 to pass the pins 23 of the spring 16 with play in all directions.
  • the elements 14 to 25 form a clutch 31 for connecting and disconnecting the drive between the plate 10 and the shaft 3.
  • the chronograph mobile 1 contains an isolation wheel 32 provided with a toothing 33 and rotatably mounted around the shaft 3 between the friction ring 27 and another ring 34 fixed to the clutch. tree.
  • the isolation wheel 32 has three identical circumferentially elongated apertures 35 which each receive one of the control pins 23 of the clutch spring 16 and whose outer edge forms a cam surface 36 shaped to radially move the ankle. 23 corresponding.
  • the shaft 3 carries as usual a reset heart 38, a finger element 39, to drive the minute counter of the chronograph, and finally a counterweight 40.
  • Each branch has a boss 43 opposite columns 44 and recesses 45 of the column wheel 5, so that the branches 29 are alternately spaced and released during successive rotation steps of the column wheel.
  • the insulator 7 is a lever pivotally mounted at 46 and supported by the spring 8 so that a boss 47 of its short arm 48 tends to lean against the columns 44 and to enter the recesses 45 of the column wheel.
  • Its long arm has a flexible curved portion 50 in its own plane, terminated by a hook 51 having a tooth 52 in front of the toothing 33 of the insulation wheel 32.
  • Two fixed pins 53 and 54 limit the movement of the hook 51 of the insulator resting against the flanks of the hook, inclined relative to the direction of its movement, so as respectively maintain the tooth 52 in the toothing 33 or away.
  • the chronograph When the START / STOP pusher is pressed a second time, the chronograph immediately goes into the off state, illustrated by the figures 5 and 6 by the following actions.
  • the column wheel 5 turns one step, so that the bumps 43 and 47 fall into one of its recesses 45.
  • the stopper 6 closes by its elasticity and stops the clutch disk 24 by clamping between its branches 29, while the insulator 7 pivots suddenly under the effect of the spring 8, so that its hook 51, makes a jump in the direction A, which makes it engage its tooth 52 in the toothing 33 and rotate the insulation wheel 32 until the cam surfaces 36 push the pins 23 radially towards the center .
  • the hook 51 can be stopped by the pin 53 so that it keeps the insulation wheel in the off position.
  • the clutch elements 22 of the spring 16 no longer touch the drive plate 10, which continues to rotate, and the spring is stopped by the clutch disc 24. It also keeps at rest via the friction spring 26, the shaft 3 and the chronograph indicators, making it possible to read the measured time.
  • the user has the choice between two actions: to restart the chronograph, to continue the measurement started, or reset it.
  • To restart the chronograph it again presses the START / STOP pushbutton, which turns the column wheel 5 by one step and returns the entire device to the walking position described with reference to the Figures 1 to 4 .
  • the insulator 7 pivots in the opposite direction to A, its tooth 52 rotates in the same direction the insulation wheel 32, whose cam surfaces 36 release the pins 23 of the clutch spring 16 at the same time that the clamp 6 opens.
  • the spring 16 pushes the clutch elements 22 against the wall 14 of the drive disk 10 and thus restores the clutch in the engaged position.
  • the second manual chronograph pushbutton To reset the chronograph from the stop position, the second manual chronograph pushbutton must be pressed. In the usual way, this does not act on the column wheel, but only on one or more hammers going to be applied against the heart 38 seconds and possible other hearts if the chronograph has minutes and hours counters .
  • the core 38 rotates to its zero position by directly driving the shaft 3 and the elements fixed thereto, in particular the friction ring 27 which can then slide on the spring 26, which is prevented from rotating because of its friction on a larger diameter against the clutch disc 24 blocked by the clamp 6.
  • the couple necessary to slide the ring 27 must only overcome the minimal friction torque required for the chronograph operation, since the axial compression of the spring 26 does not vary, unlike what happens in the vertical clutch system mentioned above.
  • the invention which is defined by the appended claims, is not limited to the embodiment described here, because it can be subject to multiple modifications and variations without departing from the principle of the solution. to the problem explained above.
  • the number and / or configuration of the clutch elements and the associated spring or springs may vary, as well as the configuration of their control means, in place of the insulator 7 and the wheel 32. It is possible to in particular consider combining these means to the clamp, for example as is the case in the vertical clutch system, since even the vertical movement of a cam acting on the clutch elements radial movement would not vary the compression force of the friction spring 26 and thus the friction torque that resists the reset.

Description

Arrière-plan de l'inventionBackground of the invention

La présente invention concerne un dispositif de commande de chronographe, comportant :

  • une roue à colonnes, associée à des moyens manuels de commande ;
  • un arbre de chronographe, rotatif autour de son axe et couplé à des moyens d'affichage de chronographe ;
  • un plateau d'entraînement, rotatif sur l'arbre de chronographe et pourvu d'un élément denté pour être entraîné en rotation continue par un mouvement d'horlogerie ;
  • un embrayage capable de coupler sélectivement par friction l'arbre de chronographe au plateau d'entraînement grâce à au moins un ressort d'embrayage;
  • et des organes de commande et d'arrêt, actionnés par la roue à colonnes pour manoeuvrer l'embrayage et arrêter ou libérer l'arbre de chronographe.
The present invention relates to a chronograph control device, comprising:
  • a column wheel associated with manual control means;
  • a chronograph shaft, rotatable about its axis and coupled to chronograph display means;
  • a drive plate, rotatable on the chronograph shaft and provided with a toothed element to be rotated continuously by a clockwork movement;
  • a clutch capable of selectively frictionally coupling the chronograph shaft to the drive plate by at least one clutch spring;
  • and control and stop members actuated by the column wheel to operate the clutch and stop or release the chronograph shaft.

Tout mécanisme de chronographe est entraîné par un mouvement d'horlogerie via un embrayage permettant de mettre en marche et arrêter ce mécanisme très rapidement, en combinaison avec des moyens de blocage qui maintiennent arrêtés les indicateurs du chronographe. Deux types d'embrayages sont utilisés couramment dans les chronographes et se distinguent par la direction de déplacement de l'élément mobile de l'embrayage.Any chronograph mechanism is driven by a clockwork movement via a clutch to start and stop this mechanism very quickly, in combination with locking means that keep stopped the chronograph indicators. Two types of clutches are commonly used in chronographs and are distinguished by the direction of movement of the movable member of the clutch.

Le système d'embrayage latéral utilise une roue d'embrayage à dents triangulaires, portée par une bascule et mobile dans son propre plan, pour aller s'engrener sur une denture à faible pas du mobile de chronographe. Ledit pas est réduit afin de minimiser les petits sauts angulaires que l'engagement des dentures cause sur le mobile de chronographe et sur l'aiguille de secondes. Ce saut est le principal inconvénient du système d'embrayage latéral.The side clutch system uses a clutch wheel with triangular teeth, carried by a rocker and movable in its own plane, to engage on a toothing at low pitch of the chronograph mobile. Said step is reduced to minimize the small angular jumps that the engagement of the teeth causes on the chronograph mobile and on the second hand. This jump is the main disadvantage of the lateral clutch system.

Pour éviter cela, le système d'embrayage vertical utilise un embrayage à friction. Par exemple, une construction actuelle est décrite en détails dans la demande de brevet EP 1791043 et correspond au préambule de la revendication 1 ci-jointe. L'élément d'embrayage mobile est une bague qui coulisse axialement autour de l'arbre de chronographe et comporte une large collerette poussée en permanence par un ressort d'embrayage prenant appui sur l'arbre. Le ressort tend à presser la bague contre une roue constituant le plateau d'entraînement, avec une force minimale suffisante pour transmettre par friction la rotation de ce plateau à l'arbre dans toutes les conditions de marche. Pour débrayer et arrêter le mobile de chronographe, une pince à mâchoires biseautées soulève la collerette et la bague à l'encontre de la poussée du ressort d'embrayage, ce qui libère la rotation du plateau et en même temps bloque par friction la bague, le ressort et l'arbre.To avoid this, the vertical clutch system uses a friction clutch. For example, a current construction is described in detail in the patent application EP 1791043 and corresponds to the preamble of claim 1 attached hereto. The movable clutch element is a ring that slides axially around the chronograph shaft and has a large collar permanently pushed by a clutch spring bearing on the shaft. The spring tends to press the ring against a wheel constituting the drive plate, with a minimum force sufficient to frictionally transmit the rotation of this plate to the shaft in all operating conditions. To disengage and stop the chronograph mobile, a beveled jaw clamp raises the collar and the ring against the thrust of the clutch spring, which frees the rotation of the plate and at the same time frictionally locks the ring, the spring and the tree.

Dans cette position apparaît le principal inconvénient du système d'embrayage vertical. Quand l'utilisateur commande la remise à zéro du chronographe, s'effectuant comme d'habitude par la poussée d'un marteau contre une came en forme de coeur, la rotation de l'arbre s'accompagne d'un glissement entre des surfaces pressées l'une contre l'autre par toute la force du ressort d'embrayage. Or, dans la position débrayée, cette force est nettement plus grande que la force minimale requise pour la position embrayée et crée donc une friction assez forte. Surmonter cette friction lors de la remise à zéro implique des efforts relativement élevés sur le marteau, le coeur, l'arbre du mobile de chronographe et les paliers de cet arbre.In this position appears the main disadvantage of the vertical clutch system. When the user controls the reset of the chronograph, proceeding as usual by pushing a hammer against a heart-shaped cam, the rotation of the shaft is accompanied by a sliding between surfaces pressed against each other by the full force of the clutch spring. However, in the disengaged position, this force is significantly greater than the minimum force required for the engaged position and therefore creates a fairly strong friction. Overcoming this friction during resetting involves relatively high efforts on the hammer, the heart, the chronograph mobile shaft and the bearings of this shaft.

Résumé de l'inventionSummary of the invention

La présente invention vise à créer un nouveau type d'embrayage de chronographe, associé à des moyens de commande à partir d'une roue à colonnes et susceptible d'éviter les inconvénients susmentionnés de l'art antérieur. Dans ce but, il est prévu un dispositif de commande de chronographe du genre indiqué en préambule ci-dessus, caractérisé en ce que l'embrayage comporte une pluralité d'éléments d'embrayage qui sont agencés pour être mobiles dans un plan radial perpendiculaire à cet axe pour s'appliquer élastiquement, sous l'effet du ou des ressorts d'embrayage, contre une paroi liée en rotation au plateau d'entraînement.The present invention aims to create a new type of chronograph clutch, associated with control means from a column wheel and likely to avoid the aforementioned drawbacks of the prior art. For this purpose, there is provided a chronograph control device of the kind indicated in the preamble above, characterized in that the clutch comprises a plurality of clutch elements which are arranged to be movable in a radial plane perpendicular to this axis for resiliently applying, under the effect of the clutch spring or springs, against a wall rotatably connected to the drive plate.

On dispose ainsi d'un embrayage à friction, donc évitant les sauts inhérents au système d'embrayage latéral, et dans lequel le blocage du mobile de chronographe n'est pas produit par l'action de débrayage elle-même et n'utilise pas la force du ressort d'embrayage. II en résulte que lors de la remise à zéro, le couple de blocage peut rester à sa valeur minimale, contrairement au cas du système d'embrayage vertical. De plus, les forces à exercer sur les éléments d'embrayage afin de débrayer à l'encontre des forces du ou des ressorts agissent uniquement dans ledit plan radial et leur résultante sera nulle si les éléments d'embrayage sont répartis uniformément autour de l'axe et soumis à des forces égales. Ainsi, le dispositif de ressort(s) d'embrayage n'introduit pas de force résultante radiale ni axiale dans le mobile de chronographe, mais seulement le couple de friction minimal nécessaire pour entraîner correctement le chronographe.It thus has a friction clutch, thus avoiding the jumps inherent in the lateral clutch system, and in which the locking of the chronograph mobile is not produced by the clutch action itself and does not use the force of the clutch spring. As a result, during the reset, the locking torque can remain at its minimum value, unlike the case of the vertical clutch system. In addition, the forces to be exerted on the clutch elements to disengage against the forces of the spring or springs act only in said radial plane and their resultant will be zero if the clutch elements are evenly distributed around the axis and subjected to equal forces. Thus, the clutch spring device (s) does not introduce a resultant radial or axial force in the chronograph wheel, but only the minimal friction torque necessary to correctly drive the chronograph.

D'autres particularités et avantages de l'invention apparaîtront ci-dessous dans la description d'un mode de réalisation actuellement préféré, présenté à titre d'exemple non limitatif en référence aux dessins annexés.Other features and advantages of the invention will appear below in the description of a presently preferred embodiment, presented by way of non-limiting example with reference to the accompanying drawings.

Description sommaire des dessinsBrief description of the drawings

  • La figure 1 est une vue schématique en perspective, à partir du côté opposé au cadran, des principaux éléments d'un dispositif selon l'invention dans une montre- chronographe, avec une roue à colonnes, un mobile de chronographe contenant un embrayage, et des organes de commande et d'arrêt pour manoeuvrer l'embrayage et arrêter ou libérer le mobile de chronographe à partir de la roue à colonnes.The figure 1 is a schematic perspective view, from the side opposite the dial, of the main elements of a device according to the invention in a chronograph-watch, with a column wheel, a chronograph mobile containing a clutch, and control and stop to maneuver the clutch and stop or release the chronograph mobile from the column wheel.
  • La figure 2 est une vue analogue à la figure 1, après enlèvement de certains éléments supérieurs de l'embrayage.The figure 2 is a view similar to the figure 1 , after removal of certain upper elements of the clutch.
  • La figure 3 est une vue en plan montrant en transparence les éléments de la figure 1, dans une position de marche du chronographeThe figure 3 is a plan view showing in transparency the elements of the figure 1 , in a chronograph running position
  • La figure 4 est une vue en coupe verticale suivant la ligne IV-IV de la figure 3, légèrement agrandie et montrant quelques éléments supplémentaires du mobile de chronographe.The figure 4 is a vertical sectional view along line IV-IV of the figure 3 , slightly enlarged and showing some additional elements of the chronograph mobile.
  • La figure 5 est une vue analogue à la figure 3 et représente une position d'arrêt du chronographe.The figure 5 is a view similar to the figure 3 and represents a stop position of the chronograph.
  • La figure 6 est une vue en coupe analogue à la figure 4, pour la position représentée dans la figure 5.The figure 6 is a sectional view similar to the figure 4 , for the position represented in the figure 5 .
Description détaillée d'un mode de réalisationDetailed description of an embodiment

Le dispositif représenté dans les dessins comporte un mobile de chronographe 1 capable de tourner autour d'un axe 2, son arbre central 3 étant monté de manière classique dans des paliers qui ne sont pas représentés ici. Une extrémité 4 de l'arbre 3 porte l'aiguille des secondes du chronographe. En dehors du mobile de chronographe 1, le dispositif comprend principalement une roue à colonnes 5 qui actionne une pince d'arrêt 6 et un isolateur 7 sollicité par un ressort 8. La roue à colonnes 5, qui est de construction classique du type à deux temps, est commandée sur sa denture 9 par le poussoir manuel START/STOP du chronographe.The device shown in the drawings comprises a chronograph mobile 1 capable of rotating about an axis 2, its central shaft 3 being mounted in a conventional manner in bearings which are not shown here. One end 4 of the shaft 3 carries the seconds hand of the chronograph. Apart from the chronograph mobile 1, the device mainly comprises a column wheel 5 which actuates a clamp 6 and an insulator 7 biased by a spring 8. The column wheel 5, which is of conventional construction of the two-stroke type, is controlled on its toothing 9 by the manual pushbutton START / STOP of the chronograph.

On se référera plus particulièrement à la figure 4 pour identifier les éléments du mobile de chronographe 1. Un plateau d'entraînement 10 muni d'un pignon 11 est monté de manière librement rotative sur l'arbre 3, entre un collet 12 et une bague 13 qui le retiennent axialement. Le pignon 11 est en prise avec une roue du mouvement d'horlogerie de la montre-chronographe, faisant donc tourner en permanence le plateau d'entraînement 10. Celui-ci comporte, dans sa région périphérique, une paroi cylindrique 14 de faible hauteur, centrée sur l'axe 2 et définissant une cavité au-dessus du disque 10. Cette cavité contient un ressort d'embrayage 16 de forme générale plate, disposé dans un plan radial 20 (voir figure 4) et ayant trois bras 17 incurvés et flexibles, qu'on voit bien dans la figure 2. Le ressort 16 comporte un moyeu 18 à un alésage central, pour être monté de manière rotative autour du collet 12 de l'arbre, et trois trous 19 équidistants angulairement. Les bras 17 du ressort, aussi répartis selon une symétrie de rotation à 120 degrés les uns des autres autour de l'axe 2, sont rattachés au moyeu 18 et ont chacun une partie terminale arrondie servant d'élément d'embrayage 22. Dans ce but, la surface extérieure de l'élément d'embrayage s'étend dans une direction sensiblement circonférentielle. Ces éléments 22 tendent à s'appuyer élastiquement en direction radiale contre la paroi cylindrique 14 du plateau d'entraînement 10, chaque bras étant précontraint par flexion dans le plan radial 20 lors du montage du ressort. Chaque élément d'embrayage 22 est muni d'une cheville de commande 23 s'étendant axialement vers le haut dans l'orientation représentée ici, c'est-à-dire vers le côté opposé au cadran.We will refer more particularly to the figure 4 to identify the elements of the chronograph mobile 1. A drive plate 10 provided with a pinion 11 is mounted freely rotatably on the shaft 3, between a collar 12 and a ring 13 which retain it axially. The pinion 11 is engaged with a wheel of the watch movement of the chronograph watch, thus permanently rotating the drive plate 10. The latter comprises, in its peripheral region, a cylindrical wall 14 of low height, centered on the axis 2 and defining a cavity above the disc 10. This cavity contains a clutch spring 16 of generally flat shape, disposed in a radial plane 20 (see figure 4 ) and having three curved and flexible arms, which can be seen in the figure 2 . The spring 16 comprises a hub 18 with a central bore, to be mounted rotatably around the collar 12 of the shaft, and three holes 19 equidistant angularly. The arms 17 of the spring, also distributed in a symmetry of rotation at 120 degrees from each other about the axis 2, are attached to the hub 18 and each have a rounded end portion serving as a clutch element 22. In this case, But, the outer surface of the clutch member extends in a substantially circumferential direction. These elements 22 tend to elastically bear in the radial direction against the cylindrical wall 14 of the drive plate 10, each arm being prestressed by bending in the radial plane 20 during assembly of the spring. Each clutch member 22 is provided with a control pin 23 extending axially upward in the orientation shown here, i.e. towards the opposite side of the dial.

Le ressort d'embrayage 16 est solidaire en rotation d'un disque d'embrayage 24 placé au-dessus de lui et ayant trois tenons 25 engagés dans les trous 19 du ressort 16. Le disque 24 est monté de manière rotative autour de l'arbre 3 et s'appuie axialement contre le collet 12 grâce à la force axiale d'un ressort de friction 26 de type diaphragme, prenant appui contre une bague de friction 27 fixée à l'arbre 3. Cette force a une valeur minimale pour créer un couple de friction suffisant pour entraîner de manière sûre la marche du chronographe. Le disque 24 présente un pourtour cylindrique 28 contre lequel peuvent s'appliquer symétriquement les deux branches 29 de la pince 6. Le disque 24 comporte en outre trois ouvertures 30 pour laisser passer les chevilles 23 du ressort 16 avec du jeu dans toutes les directions. Les éléments 14 à 25 forment un embrayage 31 permettant de connecter et déconnecter l'entraînement entre le plateau 10 et l'arbre 3.The clutch spring 16 is rotatably attached to a clutch disc 24 placed above it and having three tenons 25 engaged in the holes 19 of the spring 16. The disc 24 is rotatably mounted around the shaft 3 and bears axially against the collar 12 thanks to the axial force of a friction spring 26 of the diaphragm type, bearing against a friction ring 27 fixed to the shaft 3. This force has a minimum value to create a sufficient friction torque to safely drive the chronograph . The disc 24 has a cylindrical periphery 28 against which can be applied symmetrically the two branches 29 of the clamp 6. The disc 24 further comprises three openings 30 to pass the pins 23 of the spring 16 with play in all directions. The elements 14 to 25 form a clutch 31 for connecting and disconnecting the drive between the plate 10 and the shaft 3.

Pour commander l'embrayage, le mobile de chronographe 1 contient une roue d'isolation 32 pourvue d'une denture 33 et montée de manière rotative autour de l'arbre 3 entre la bague de friction 27 et une autre bague 34 fixée à l'arbre. La roue d'isolation 32 comporte trois ouvertures identiques 35, allongées en direction circonférentielle, qui reçoivent chacune l'une des chevilles de commande 23 du ressort d'embrayage16 et dont le bord extérieur forme une surface de came 36 conformée pour déplacer radialement la cheville 23 correspondante.To control the clutch, the chronograph mobile 1 contains an isolation wheel 32 provided with a toothing 33 and rotatably mounted around the shaft 3 between the friction ring 27 and another ring 34 fixed to the clutch. tree. The isolation wheel 32 has three identical circumferentially elongated apertures 35 which each receive one of the control pins 23 of the clutch spring 16 and whose outer edge forms a cam surface 36 shaped to radially move the ankle. 23 corresponding.

On voit dans la figure 4 qu'au-dessus de la bague 34, l'arbre 3 porte comme d'habitude un coeur 38 de remise à zéro, un élément à doigt 39, pour entraîner le compteur de minutes du chronographe, et enfin un contrepoids 40. Ces éléments habituels sont supprimés dans la perspective de la figure 1 afin de clarifier le dessin.We see in the figure 4 above the ring 34, the shaft 3 carries as usual a reset heart 38, a finger element 39, to drive the minute counter of the chronograph, and finally a counterweight 40. These elements are removed from the perspective of the figure 1 to clarify the drawing.

La pince d'arrêt 6, montée sur un pivot par son orifice 42, est élastique dans son plan et tend à serrer par son élasticité le pourtour 28 du disque d'embrayage 24 entre ses branches 29. Chaque branche présente une bosse 43 en regard des colonnes 44 et des creux 45 de la roue à colonnes 5, de sorte que les branches 29 sont alternativement écartées et relâchées lors des pas de rotation successifs de la roue à colonnes.The stopper 6, mounted on a pivot by its orifice 42, is elastic in its plane and tends to tighten by its elasticity the periphery 28 of the clutch disc 24 between its branches 29. Each branch has a boss 43 opposite columns 44 and recesses 45 of the column wheel 5, so that the branches 29 are alternately spaced and released during successive rotation steps of the column wheel.

L'isolateur 7 est un levier monté de manière pivotante en 46 et épaulé par le ressort 8 de manière qu'une bosse 47 de son bras court 48 tende à s'appuyer contre les colonnes 44 et à entrer dans les creux 45 de la roue à colonnes. Son long bras comporte une partie incurvée 50 flexible dans son propre plan, terminée par un crochet 51 ayant une dent 52 en face de la denture 33 de la roue d'isolation 32. Deux goupilles fixes 53 et 54 limitent le débattement du crochet 51 de l'isolateur en s'appuyant contre les flancs du crochet, inclinés par rapport à la direction de son mouvement, de façon à respectivement maintenir la dent 52 dans la denture 33 ou l'en écarter.The insulator 7 is a lever pivotally mounted at 46 and supported by the spring 8 so that a boss 47 of its short arm 48 tends to lean against the columns 44 and to enter the recesses 45 of the column wheel. Its long arm has a flexible curved portion 50 in its own plane, terminated by a hook 51 having a tooth 52 in front of the toothing 33 of the insulation wheel 32. Two fixed pins 53 and 54 limit the movement of the hook 51 of the insulator resting against the flanks of the hook, inclined relative to the direction of its movement, so as respectively maintain the tooth 52 in the toothing 33 or away.

De la manière habituelle, quand on presse une première fois le poussoir START/STOP, la roue à colonnes 5 tourne d'un pas de sa denture 9, ses colonnes 44 repoussent les bosses 43 et 47, ce qui ouvre la pince 6 et, au moyen de l'isolateur 7, met roue d'isolation 32 dans une position telle que l'embrayage se ferme et le chronographe se met en marche. Le dispositif selon l'invention se trouve alors dans l'état illustré par les figures 1 à 4 : les éléments d'embrayage 22 étant pressés contre la paroi 14 du plateau d'entraînement 10 entraîné par le mouvement d'horlogerie, le ressort 16 et le disque d'embrayage 24 sont entraînés en rotation par la friction de l'embrayage et entrainent, via le ressort de friction 26, la rotation de l'arbre 3 et du reste du mobile de chronographe 1 dans le sens indiqué par la flèche A, en général à la vitesse d'un tour par minute. Les chevilles de commande 23 du ressort d'embrayage sont dégagées des surfaces de came 36 de l'isolateur 32, mais au moins l'une d'elles bute contre l'extrémité de l'ouverture correspondante 35 de la roue 32 pour faire tourner celle-ci avec le reste du mobile 1.In the usual way, when the push START / STOP is pressed a first time, the column wheel 5 rotates one step of its toothing 9, its columns 44 push back the bumps 43 and 47, which opens the clamp 6 and, by means of the insulator 7, insulating wheel 32 is placed in a position such that the clutch closes and the chronograph starts. The device according to the invention is then in the state illustrated by the Figures 1 to 4 : the clutch elements 22 being pressed against the wall 14 of the drive plate 10 driven by the clockwork movement, the spring 16 and the clutch plate 24 are rotated by the friction of the clutch and cause , via the friction spring 26, the rotation of the shaft 3 and the rest of the chronograph mobile 1 in the direction indicated by the arrow A, usually at a speed of one revolution per minute. The control pins 23 of the clutch spring are disengaged from the cam surfaces 36 of the insulator 32, but at least one of them abuts against the end of the corresponding opening 35 of the wheel 32 to rotate. this one with the rest of the mobile 1.

Au moment où l'on presse une seconde fois le poussoir START/STOP, le chronographe se met aussitôt dans l'état d'arrêt, illustré par les figures 5 et 6, par les actions suivantes. La roue à colonnes 5 tourne d'un pas, de sorte que les bosses 43 et 47 tombent dans un de ses creux 45. La pince d'arrêt 6 se ferme par son élasticité et arrête le disque d'embrayage 24 par serrage entre ses branches 29, tandis que l'isolateur 7 pivote brusquement sous l'effet du ressort 8, si bien que son crochet 51, effectue un saut dans le sens A, qui le fait engager sa dent 52 dans la denture 33 et faire pivoter la roue d'isolation 32 jusqu'à ce que les surfaces de came 36 repoussent les chevilles 23 radialement en direction du centre. Le crochet 51 peut être arrêté par la goupille 53 pour qu'il maintienne la roue d'isolation en position d'arrêt. Dans cet état, les éléments d'embrayage 22 du ressort 16 ne touchent plus le plateau d'entraînement 10, qui continue de tourner, et le ressort est arrêté par le disque d'embrayage 24. Celui-ci maintient aussi à l'arrêt, via le ressort de friction 26, l'arbre 3 et les indicateurs du chronographe, permettant de lire le temps mesuré.When the START / STOP pusher is pressed a second time, the chronograph immediately goes into the off state, illustrated by the figures 5 and 6 by the following actions. The column wheel 5 turns one step, so that the bumps 43 and 47 fall into one of its recesses 45. The stopper 6 closes by its elasticity and stops the clutch disk 24 by clamping between its branches 29, while the insulator 7 pivots suddenly under the effect of the spring 8, so that its hook 51, makes a jump in the direction A, which makes it engage its tooth 52 in the toothing 33 and rotate the insulation wheel 32 until the cam surfaces 36 push the pins 23 radially towards the center . The hook 51 can be stopped by the pin 53 so that it keeps the insulation wheel in the off position. In this state, the clutch elements 22 of the spring 16 no longer touch the drive plate 10, which continues to rotate, and the spring is stopped by the clutch disc 24. It also keeps at rest via the friction spring 26, the shaft 3 and the chronograph indicators, making it possible to read the measured time.

A partir de cette position d'arrêt, l'utilisateur a le choix entre deux actions: faire repartir le chronographe, pour continuer la mesure commencée, ou le remettre à zéro. Pour faire repartir le chronographe, il presse de nouveau le poussoir START/STOP, ce qui fait tourner d'un pas la roue à colonnes 5 et remet tout le dispositif dans la position de marche décrite en référence aux figures 1 à 4. En particulier, l'isolateur 7 pivote dans le sens opposé à A, sa dent 52 fait tourner dans le même sens la roue d'isolation 32, dont les surfaces de came 36 libèrent les chevilles 23 du ressort d'embrayage 16 en même temps que la pince 6 s'ouvre. Le ressort 16 repousse les éléments d'embrayage 22 contre la paroi 14 du disque d'entraînement 10 et remet ainsi l'embrayage en position embrayée.From this stop position, the user has the choice between two actions: to restart the chronograph, to continue the measurement started, or reset it. To restart the chronograph, it again presses the START / STOP pushbutton, which turns the column wheel 5 by one step and returns the entire device to the walking position described with reference to the Figures 1 to 4 . In particular, the insulator 7 pivots in the opposite direction to A, its tooth 52 rotates in the same direction the insulation wheel 32, whose cam surfaces 36 release the pins 23 of the clutch spring 16 at the same time that the clamp 6 opens. The spring 16 pushes the clutch elements 22 against the wall 14 of the drive disk 10 and thus restores the clutch in the engaged position.

Pour remettre le chronographe à zéro à partir de la position d'arrêt, on doit presser le second poussoir manuel de chronographe. De la manière habituelle, ceci n'agit pas sur la roue à colonnes, mais seulement sur un ou plusieurs marteaux allant s'appliquer contre le coeur 38 des secondes et les éventuels autres coeurs si le chronographe possède des compteurs de minutes et d'heures. Le coeur 38 tourne jusqu'à sa position zéro en entraînant directement l'arbre 3 et les éléments fixés à celui-ci, notamment la bague de friction 27 qui peut alors glisser sur le ressort 26, lequel est empêché de tourner à cause de sa friction sur un plus grand diamètre contre le disque d'embrayage 24 bloqué par la pince 6. Le couple nécessaire pour faire glisser la bague 27 doit seulement surmonter le couple de friction minimal requis pour la marche du chronographe, puisque la compression axiale du ressort 26 ne varie pas, contrairement à ce qui se passe dans le système à embrayage vertical mentionné plus haut.To reset the chronograph from the stop position, the second manual chronograph pushbutton must be pressed. In the usual way, this does not act on the column wheel, but only on one or more hammers going to be applied against the heart 38 seconds and possible other hearts if the chronograph has minutes and hours counters . The core 38 rotates to its zero position by directly driving the shaft 3 and the elements fixed thereto, in particular the friction ring 27 which can then slide on the spring 26, which is prevented from rotating because of its friction on a larger diameter against the clutch disc 24 blocked by the clamp 6. The couple necessary to slide the ring 27 must only overcome the minimal friction torque required for the chronograph operation, since the axial compression of the spring 26 does not vary, unlike what happens in the vertical clutch system mentioned above.

Bien entendu, l'invention, qui est définie par les revendications annexées, n'est pas limitée à l'exemple de réalisation décrit ici, car elle peut faire l'objet de multiples modifications et variantes sans s'écarter du principe de la solution au problème exposé plus haut. En particulier, le nombre et/ou la configuration des éléments d'embrayage et du ou des ressorts associés peuvent varier, ainsi que la configuration de leurs moyens de commande, à la place de l'isolateur 7 et de la roue 32. On peut notamment envisager de combiner ces moyens à la pince d'arrêt, par exemple comme c'est le cas dans le système à embrayage vertical, puisque même le mouvement vertical d'une came agissant sur les éléments d'embrayage à mouvement radial ne ferait pas varier la force de compression du ressort de friction 26 et donc le couple de friction qui résiste à la remise à zéro.Of course, the invention, which is defined by the appended claims, is not limited to the embodiment described here, because it can be subject to multiple modifications and variations without departing from the principle of the solution. to the problem explained above. In particular, the number and / or configuration of the clutch elements and the associated spring or springs may vary, as well as the configuration of their control means, in place of the insulator 7 and the wheel 32. It is possible to in particular consider combining these means to the clamp, for example as is the case in the vertical clutch system, since even the vertical movement of a cam acting on the clutch elements radial movement would not vary the compression force of the friction spring 26 and thus the friction torque that resists the reset.

Claims (8)

  1. Chronograph device including:
    - a column wheel (5), associated with a manual control means;
    - a chronograph arbour (3), rotating about the axis (2) thereof and coupled to a chronograph display means;
    - a drive plate (10), rotating on the chronograph arbour and provided with a toothed element (11) to be continuously driven in rotation by a timepiece movement;
    - a coupling device (31) capable of selectively friction coupling the chronograph arbour (3) to the drive plate (10) by means of at least one coupling spring (16);
    - and control and stopping members (6, 7, 32) actuated by the column wheel to operate the coupling device and to stop or release the chronograph arbour;
    characterized in that the coupling device (31) comprises a plurality of coupling elements (22) which are arranged to be moveable in a radial plane perpendicular to said axis (2) to be applied elastically, under the effect of the coupling spring or springs (16), against a wall (14) rotatably connected to the drive plate (10).
  2. Device according to claim 1, characterized in that the coupling elements (22) are distributed around the axis (2) in rotational symmetry and are rotatably connected to a coupling disc (24), which is acted upon by a stop clamp (6) controlled by the column wheel (5), the coupling disc (24) being rotatably connected to the arbour (3) via a friction spring (26).
  3. Device according to claim 1 or 2, characterized in that the control members of the coupling device include a control pin (23) on each coupling element (22), an isolator wheel (32) capable of pivoting on the arbour (3), provided with an outer toothing (33) and with cam surfaces (36) cooperating with said control pins (23) to move said pins radially, and a lifting lever (7) formed by a pivoting lever, operated by abutment against the column wheel (5) and having a tooth (52) capable of engaging in said toothing (33) of the isolator wheel (32) in order, in a first pivoting direction of said lifting lever (7), to pivot the isolator wheel (32) so that the cam surfaces (36) move the control pins (23) and the coupling elements (22) towards the centre, the reverse movements being produced in the other pivoting direction of the lifting lever (7).
  4. Device according to claim 3, characterized in that the lifting lever (7) includes a flexible portion (50) in one arm which ends in a hook (51) provided with said tooth (52) and whose amplitude of movement is limited by stop members (53, 54).
  5. Device according to claim 2, characterized in that it includes a single coupling spring (16) rotatably connected to the arbour (3) by the insertion of a friction spring (26) and in that the coupling spring (16) includes a central hub (18) and flexible arms (17) extending in said radial plane (20) from the hub, the free end of each of said arms being provided with one of the coupling elements (22) with the corresponding control pin (23).
  6. Device according to claim 5, characterized in that each coupling element (22) is formed by an end portion of the corresponding arm (17) of the coupling spring (16).
  7. Device according to claim 6, characterized in that each arm (17) of the coupling spring (16) has a curved shape, the end portion thereof having an outer surface which extends in a substantially circumferential direction opposite said wall (14).
  8. Device according to any of the preceding claims, characterized in that said wall (14) is substantially cylindrical and forms part of the drive plate (10).
EP20080151029 2008-02-04 2008-02-04 Chronograph device with friction coupling Active EP2085832B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20080151029 EP2085832B1 (en) 2008-02-04 2008-02-04 Chronograph device with friction coupling

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20080151029 EP2085832B1 (en) 2008-02-04 2008-02-04 Chronograph device with friction coupling

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EP2085832A1 EP2085832A1 (en) 2009-08-05
EP2085832B1 true EP2085832B1 (en) 2013-04-10

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Cited By (4)

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RU2739149C1 (en) * 2019-07-23 2020-12-21 Омега Са Stopping the clock carriage, comprising two resilient locking elements
RU2739709C1 (en) * 2019-07-23 2020-12-28 Омега Са Clock carriage locking mechanism with locking wheel
RU2741258C1 (en) * 2019-07-23 2021-01-22 Омега Са Clock carriage stopper with carriage stop strip
RU2741490C1 (en) * 2019-07-23 2021-01-26 Омега Са Stopper of clock carriage with lifting pin and locking pin

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EP2871534B1 (en) 2013-11-06 2017-01-04 ETA SA Manufacture Horlogère Suisse Timepiece mobile with unidirectional wheels
CH709153A1 (en) * 2014-01-16 2015-07-31 Richemont Int Sa Mechanism to split insulation and mechanical timepiece having a chronograph mechanism provided with this mechanism to split insulation.
EP3324249A1 (en) * 2016-11-17 2018-05-23 Nogerah SA Clutch system for chronograph
CN106896693A (en) * 2016-12-16 2017-06-27 惠贯有限公司 A kind of vertical clutch structure of wrist-watch
EP3407143A1 (en) 2017-05-24 2018-11-28 Rolex Sa Mechanical linking device
EP3671370B1 (en) 2018-12-20 2021-08-04 Patek Philippe SA Genève Clutch device and chronograph mechanism comprising such a clutch device
EP3869278B1 (en) 2020-02-21 2023-03-08 Montres Breguet S.A. Vertical clutch device for a timepiece
CH719048A9 (en) 2021-10-11 2023-06-30 Lvmh Swiss Mft Sa Clockwork clutch mechanism.
EP4202577A1 (en) * 2021-12-21 2023-06-28 Manufacture d'Horlogerie Audemars Piguet SA Lever device for a timepiece movement
CN115453843B (en) * 2022-08-29 2023-08-22 中国计量大学 Timing mechanical structure with reset function

Family Cites Families (2)

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Publication number Priority date Publication date Assignee Title
FR2665549B1 (en) * 1990-07-31 1992-12-04 Eatons Controls Sa ROTARY FRICTION CONTROL.
US7597471B2 (en) 2005-11-24 2009-10-06 Vaucher Manufacture Fleurier S.A. Time piece chronograph clockwork movement

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2739149C1 (en) * 2019-07-23 2020-12-21 Омега Са Stopping the clock carriage, comprising two resilient locking elements
RU2739709C1 (en) * 2019-07-23 2020-12-28 Омега Са Clock carriage locking mechanism with locking wheel
RU2741258C1 (en) * 2019-07-23 2021-01-22 Омега Са Clock carriage stopper with carriage stop strip
RU2741490C1 (en) * 2019-07-23 2021-01-26 Омега Са Stopper of clock carriage with lifting pin and locking pin
EP3770694A1 (en) 2019-07-23 2021-01-27 Omega SA Timepiece stop-cage comprising two elastic stopping elements
EP3770693A1 (en) 2019-07-23 2021-01-27 Omega SA Timepiece stop-cage mechanism with stop wheel
EP3770695A1 (en) 2019-07-23 2021-01-27 Omega SA Timepiece stop-cage with blade for stopping the cage
EP3770696A1 (en) 2019-07-23 2021-01-27 Omega SA Timepiece stop-cage with lifting finger and stopping finger

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