EP2010971B1 - Movement for timepiece with retrograde display - Google Patents

Movement for timepiece with retrograde display Download PDF

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Publication number
EP2010971B1
EP2010971B1 EP07727533A EP07727533A EP2010971B1 EP 2010971 B1 EP2010971 B1 EP 2010971B1 EP 07727533 A EP07727533 A EP 07727533A EP 07727533 A EP07727533 A EP 07727533A EP 2010971 B1 EP2010971 B1 EP 2010971B1
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EP
European Patent Office
Prior art keywords
cam
rotation
lever
rocker
periphery
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EP07727533A
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German (de)
French (fr)
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EP2010971A2 (en
Inventor
Alberto Papi
Nicolas Dehon
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Sowind SA
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Sowind SA
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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
    • G04B19/00—Indicating the time by visual means
    • G04B19/02—Back-gearing arrangements between gear train and hands

Definitions

  • the present invention relates to a display module, for watch movement for driving a retrograde display member of at least one hourly information, comprising a frame carrying drive means for driving the display member comprising a mobile, intended to be driven by a finishing gear of the watch movement and carrying a first cam of the same axis of rotation with reference to the frame.
  • the display module also comprises a rocker bearing a probe arranged to bear against the periphery of the first cam under the effect of deformable elastic means undergoing deformation of variable amplitude. The latter causes the application of a corresponding force on the rocker, depending on the distance separating the probe from the axis of rotation of the first cam.
  • the display module further comprises transmission means for connecting the flip-flop to the drive means of the retrograde display member.
  • the present invention also relates to a watch movement having the above characteristics as well as a timepiece comprising such a movement.
  • each of the corresponding mechanisms comprises a rocker with two arms connected by a bend, in the region of which pivots the rocker relative to the frame of the movement.
  • the free end of a first arm carries a feeler disposed in abutment against the periphery of a cam driven in rotation by the movement finishing work train, while the free end of the second arm carries a rake arranged in engagement with a mobile drive of a display member.
  • a long spring is connected to the frame by a first of its ends while its second end is arranged to apply a force on the rocker, to maintain the probe in contact with the cam.
  • This type of construction has certain drawbacks, in particular related to the application, to the gear train of the movement, of a friction force having a large variation in amplitude between two extreme positions of the rocker. Indeed, it is found, on the one hand, that the axis of rotation of the rocker is relatively far from the probe and, secondly, that the point of support of the spring on the rocker is provided at the probe and is therefore also distant from the axis of rotation of the rocker. This results in a large amplitude of the deformations of the spring between the one and the other of the extreme positions of the rocker, ie a large amplitude of the variation of the force that this spring applies to the rocker.
  • the rocker being disposed in abutment on a cam, itself driven in rotation by the gear train of the movement, it follows a disturbance of the movement of the movement which may have significant values of deviation.
  • the document FR 743.618 discloses a second cam on which the return spring is supported.
  • the present invention defined by claim 1, has for main purpose to overcome the disadvantages of the known mechanisms of the prior art, by proposing a movement for a retrograde timepiece in which the means for implementing the Retrograde display does not disturb the movement.
  • the present invention more particularly relates to a movement for a timepiece of the type mentioned above, characterized in that a force regulating device is interposed between the elastic means and the rocker.
  • the operation of the movement has a better accuracy.
  • this accuracy is maintained even in the case where the movement is suitable for driving a display member over a large angular sector, in particular greater than 60 degrees, preferably greater than 120 degrees.
  • the mobile is driven by a wheel frictionally mounted on a barrel wheel tube, the rocker having a rake having a toothing arranged in engagement with a toothing of a pinion mounted free in rotation on the barrel wheel tube and rotationally integral with an additional tube, the latter being intended to drive, at least indirectly, a display member of a time information.
  • the force regulation device comprises a second cam disposed integrally with the rocker having the same axis of rotation as the latter.
  • the elastic means preferably comprise a long spring having a straight portion of which a free end is disposed in abutment against the periphery of the second cam.
  • the rocker undergoes the force generated by the elastic means via its rake, the pinion and the additional cam whose periphery makes it possible to regulate the force effectively transmitted to the rocker.
  • the periphery of the additional cam has a shape corresponding at least partially to a logarithmic curve portion.
  • a roller may be carried by the additional probe to ensure the contact between the additional rocker and the periphery of the additional cam with the least possible friction.
  • such a movement can be implemented in a timepiece comprising a display member of a time magnitude scanning an angular sector of angle greater than 120 degrees, such as for example a display of hours on a clock. 270 degree sector.
  • FIG. 1 represents a simplified top view of a detail of the timepiece movement according to a first variant of a preferred embodiment of the present invention, in a first configuration;
  • the figure 2 represents a simplified top view similar to the view of the figure 1 in a second configuration
  • FIG. 3 represents a simplified cross-sectional view of the movement of the preceding figures
  • FIG. 4 represents a simplified top view of a detail of the timepiece movement according to a second variant of a preferred embodiment of the present invention.
  • the figure 5 represents a simplified cross-sectional view of the movement of the figure 4 .
  • the figure 1 represents a top view of a construction detail of the movement according to a first variant of a preferred embodiment of the present invention, more particularly of its mechanism for implementing a retrograde display. This mechanism is presented in a first configuration on the figure 1 whereas it will be presented in a second configuration, different, on the figure 2 .
  • the embodiment described concerns a mechanism for driving a pointer 1 for indicating the retrograde-type display hours, in particular in relation to a graduated sector (not visible) extending over an angle of 270 degrees.
  • FIGS are schematically represented in the implementation of the movement according to the invention in a timepiece comprising a box including a middle part 2.
  • the movement comprises a plate (not shown) on which the module of display and, in a hole of which is mounted a time setting rod 3, better visible on the figure 3 .
  • the hour hand 1 is disposed at the center of the timepiece being driven by a cannon wheel (reference 4, figure 3 ) whose tube 5 carries an additional tube 6, mounted free to rotate on the barrel wheel.
  • the barrel wheel is driven in a conventional manner by a work train (not visible) of the movement, the latter being of mechanical or electromechanical type without affecting the object of the present invention.
  • An hour wheel 7 is also mounted frictionally on the tube 5 of the barrel wheel.
  • a mobile 8 is disposed at a distance from the hour wheel 7 and carries a control wheel 9 and a first cam 10 whose periphery has a spiral shape.
  • the control wheel 9 and the first cam 10 are made integral in rotation, by means of a pin 11, and have a same axis of rotation 12 with reference to the frame of the movement.
  • the control wheel 9 has a peripheral toothing arranged in engagement with the toothing of the hour wheel 7, so that the first cam 10 is rotated, in the counter clockwise on the figure 1 , by the movement of the hour wheel 7.
  • the retrograde display mechanism further comprises a rocker 20, rotatably mounted on the frame of the movement, along an axis X located in the immediate vicinity of the periphery of the control wheel 9. Starting from its region mounted to pivot on the X axis, the rocker 20 has two arms 21 and 22.
  • the first arm 21 initially comprises two portions 23 and 24 deviating from each other before joining to form a loop in the extension of which extends a probe 25.
  • the free end 26 of the probe, completed in point, is placed in abutment against the periphery of the first cam 10.
  • the second arm 22 has an elongated and curved shape, to bypass the first cam 10, ending in a rake 27, arranged in engagement with a pinion 28 integral with the additional tube 6.
  • a second cam 30 is rotatably mounted on the X axis, being integral with the latch 20.
  • the latter has a heart-shaped periphery, more precisely defined by a double curvature, each of which corresponds to a logarithmic curve portion.
  • a long spring 31 is fixed to the frame of the movement, by means of a screw 32, by a first end 33 wound in the form of a ring, while its second end 34 has a flat surface 35 arranged in abutment against the periphery of the second cam 30.
  • a pin 36 integral with the frame, forms a counter-support to prevent the rotation of the spring in the counterclockwise direction.
  • the end 34 may be provided with a support carrying a roller (such as that visible on the figures 4 and 5 ) for ensuring contact between the long spring 31 and the periphery of the cam 30.
  • the first cam 10 rotates in the counterclockwise direction of rotation, it has an increasing radius opposite the position of the probe 25, causing a rotation of the rocker 20 in the same direction. While the rocker rotates relative to its axis X, the rake 27 induces a rotational movement of the additional tube 6, in the clockwise direction, the latter being free to rotate relative to the barrel wheel.
  • the hour hand 1 evolves with regard to graduations which can extend for example over twelve hours between the initial and final positions of the needle, these positions being spaced at an angle of 270 degrees according to the present method of realization, as an indication.
  • the second cam 30 also rotates in the anti-clockwise direction by slightly deforming the spring 31 as its radius increases in the region of contact of the flat surface 35.
  • the stiffness constant of the spring 31 is adjusted so that the contact of the tip 26 of the probe on the periphery of the first cam is guaranteed at every moment, without generating too much friction.
  • the probe 25 thus has a gradual and continuous distance with reference to the axis of rotation 12 of the first cam 10. Small crosses are shown on the periphery of the first cam to identify the positions respectively corresponding to each of the hours displayed by the hour hand 1 opposite the graduations.
  • the figure 2 represents a view similar to that of the figure 1 , in a different configuration of the retrograde display mechanism, more precisely, a little less than twelve hours after the configuration of the figure 1 , the first cam 10 having performed almost a complete revolution in this interval.
  • the hour hand 1 has undergone an angular displacement of the order of 270 degrees at the same time.
  • the spring tension variation between these two extreme positions of the probe advantageously has a negligible impact on the progress of the finishing train.
  • This particular characteristic also allows the use of indication sector of hourly magnitudes of greater angular amplitude than with the previous mechanisms.
  • the action of the spring on the rocker, via the second cam 30, makes it possible to obtain a slower return of the hour hand 1 in its initial position than in the timepieces according to the art. previous, in which the spring acts directly on the rocker. It may be noted that the theoretical return speed of the needle is constant during the duration of this movement due to the use of a logarithmic curve, which is not the case if the cam has a periphery whose shape is based on the Archimedes curve, particularly in the rest position area shown on the figure 1 that is why the first is preferred.
  • the figure 3 represents a simplified cross-sectional view of a part of the movement which has just been described in relation to the figures 1 and 2 .
  • the time setting rod 3 carries, in a conventional manner, a winding pinion 41 arranged in engagement with a crown wheel 42 of the movement, to effect the winding a barrel spring (not shown), and a sliding pinion 43 which can be brought into engagement with a return 44, itself engaged with the barrel wheel 4 to perform the time setting of display organs.
  • the hour wheel 7 is driven simultaneously with the barrel wheel 4 to rotate the control wheel 9 and the first cam 10 and, consequently, the additional tube 6 carrying the hour hand 1.
  • the figures 4 and 5 are, respectively in simplified top view and cross-sectional view, a display module for watch movement according to a second variant of a preferred embodiment of the present invention.
  • the second variant differs from the first by a different arrangement of the elastic means to ensure a good quality of contact between the probe 25 and the periphery of the first cam 10, the force regulating means applied to the rocker being adapted Consequently.
  • the additional tube 6 carrying the pinion 28 is further secured to an additional cam 50 having a periphery of variable radius.
  • the latter presents, from its lowest radius to its largest radius, a shape corresponding to a portion of a logarithmic curve. Furthermore, the regions of smaller radius and greater radius are connected by a substantially radial flank 51.
  • the display module according to the second embodiment further comprises an additional rocker 52 rotatably mounted on the frame of the movement, along an axis of rotation located at a distance from the axis of rotation of the gun wheel 4.
  • the additional rocker 52 comprises a base 53 from which extends an arm 54 whose free end carries a feeler 55, here made in the form of a support 56 carrying a roller 57 intended to be placed in abutment against the periphery of the additional cam 50.
  • a feeler 55 here made in the form of a support 56 carrying a roller 57 intended to be placed in abutment against the periphery of the additional cam 50.
  • the implementation of such a roller makes it possible to reduce the friction arising from the contact between the feeler 55 and the periphery of the additional cam 50, when the latter is rotated under the effect of the cooperation between the rake 27 and the pinion 28.
  • the roller may be made of ruby or sapphire, as a non-limiting indicative.
  • the base 53 of the additional rocker comprises a bearing surface 58 having the shape of an edge.
  • a long spring 61 is fixed to the frame of the movement, by means of a screw 62, by a first end 63 wound in the form of a ring, while its second end 64, free, is placed in abutment against the bearing surface. 58 of the additional cam 50.
  • a screw 66 integral with the frame, forms a counter-support to prevent the rotation of the spring in the clockwise direction, thereby causing its deformation when the bearing surface 58 is rotated in the counter-clockwise, under the effect of increasing the radius of the additional cam 50.
  • the screw 66 is preferably an eccentric whereby the orientation of the long spring 61 can be adjusted with a large position.
  • the first cam 10 rotates in the counterclockwise direction of rotation, it has an increasing radius opposite the position of the probe 25, causing a rotation of the rocker 20 in the same direction. While the rocker rotates relative to its axis X, the rake 27 induces a rotational movement of the additional tube 6, in the clockwise direction, the latter being free to rotate relative to the barrel wheel.
  • the hour hand 1 evolves with respect to graduations that can extend for example over twelve hours between the initial and final positions of the needle.
  • the additional cam 50 rotates simultaneously in the clockwise direction, thus presenting an increasing radius to the probe 55 of the additional rocker 52 which rotates, therefore, in the counter-clockwise direction.
  • the rotation of the additional rocker causes a progressive deformation of the spring 61 as the radius of the periphery of the additional cam increases.
  • the rocker 20 undergoes each moment, except during the brief retrograde movement, two opposing forces, namely a first force tending to turn it in the counterclockwise direction and exerted by the periphery of the first cam 10 , and a second force tending to turn it clockwise under the effect of the deformation of the spring 61, generating a force transmitted to the rocker 20 via the additional rocker 52, its probe 55, the periphery of the additional cam 50, the pinion 28 and the rake 27.
  • the force generated by the deformation of the spring 61 is regulated by the shape of the periphery of the additional cam 50 which makes it possible to control the corresponding torque transmitted to the pinion 28.
  • the regulation is carried out here with a better precision insofar as the additional cam 50 has a rotation angle much greater than that of the second cam 30 between the two extreme positions of the display member 1.
  • the present variant offers a reduction ratio the rotation of the rocker 20 through the gear connection between the rake 27 and the pinion 28 allowing the additional cam 50 to have a larger useful portion of its periphery than that of the second cam 30 of the first variant.
  • this construction because of the antagonistic forces it generates, has the additional advantage of preventing the occurrence of a game at the level of the gear connection provided between the pinion 28 and the rake 27.
  • the stiffness constant of the spring 61 is adjusted so that the contact of the tip 26 of the probe on the periphery of the first cam 10 is guaranteed at all times, without causing too much friction.
  • this geometry makes it possible to arrange the axis of rotation of the rocker in the immediate vicinity of the cam while having the possibility of applying the force of the spring in the vicinity of this same axis.
  • the skilled person may choose a different rocker geometry according to his own needs.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Unknown Time Intervals (AREA)
  • Electromechanical Clocks (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)

Abstract

The present invention relates to a movement for a timepiece having a retrograde display member displaying at least one time division, comprising a going train, means of driving the display member comprising a wheel unit (8) driven by the going train and carrying a first cam (10) sharing the same axis of rotation (12). The movement also includes a rocker (20) supporting a probe (25) held against the edge of the first cam by deformable elastic means (31, 61) undergoing a deformation of variable amplitude. This results in the application of a corresponding force on the rocker in proportion to the distance between the probe and the axis of rotation (12) of the first cam. The movement also includes drive means (27) to connect the rocker to a retrograde display member (1). More precisely, the movement includes a force-regulating device (30, 50) interposed between the elastic means and the rocker. In one variant the regulating device is in the form of a second, heart-shaped cam (30) coupled in rotation to the rocker and sharing the same axis of rotation (X) as the latter. The elastic means then comprise a long spring (31), one end (34, 35) of which presses against the edge of the second cam so that the application of the force on the rocker takes the form of a torque applied directly by the second cam to its axis of rotation.

Description

Domaine techniqueTechnical area

La présente invention concerne un module d'affichage, pour mouvement horloger destiné à entraîner un organe d'affichage rétrograde d'au moins une information horaire, comportant un bâti portant des moyens d'entraînement destinés à entraîner l'organe d'affichage comprenant un mobile, destiné à être entraîné par un rouage de finissage du mouvement horloger et, portant une première came de même axe de rotation en référence au bâti. Le module d'affichage comprend également une bascule portant un palpeur agencé de manière à être en appui contre la périphérie de la première came sous l'effet de moyens élastiques déformables subissant une déformation d'amplitude variable. Cette dernière entraîne l'application d'une force correspondante sur la bascule, en fonction de la distance séparant le palpeur de l'axe de rotation de la première came. Le module d'affichage comprend en outre des moyens de transmission destinés à relier la bascule aux moyens d'entraînement de l'organe d'affichage rétrograde.The present invention relates to a display module, for watch movement for driving a retrograde display member of at least one hourly information, comprising a frame carrying drive means for driving the display member comprising a mobile, intended to be driven by a finishing gear of the watch movement and carrying a first cam of the same axis of rotation with reference to the frame. The display module also comprises a rocker bearing a probe arranged to bear against the periphery of the first cam under the effect of deformable elastic means undergoing deformation of variable amplitude. The latter causes the application of a corresponding force on the rocker, depending on the distance separating the probe from the axis of rotation of the first cam. The display module further comprises transmission means for connecting the flip-flop to the drive means of the retrograde display member.

La présente invention concerne également un mouvement horloger présentant les caractéristiques ci-dessus ainsi qu'une pièce d'horlogerie comportant un tel mouvement.The present invention also relates to a watch movement having the above characteristics as well as a timepiece comprising such a movement.

Dans la suite du texte, il faudra comprendre, par module d'affichage, les organes permettant d'entraîner un organe indicateur, qu'ils soient intégrés directement sur la platine d'un mouvement horloger ou qu'ils soient effectivement assemblés sous la forme d'un module susceptible d'être rapporté sur un mouvement de base préexistant. Par voie de conséquence, on désignera par "bâti" la platine du mouvement horloger ou un pont de module rapporté, sans incidence sur la portée de la présente invention qui n'est pas limitée à l'une ou l'autre alternative.In the rest of the text, it will be necessary to understand, by display module, the organs making it possible to drive an indicator organ, whether they are integrated directly on the plate of a watch movement or that they are actually assembled in the form a module that can be attached to a pre-existing basic movement. Consequently, the term "frame" will be the platen of the watch movement or an insert module bridge, without affecting the scope of the present invention which is not limited to one or the other alternative.

Etat de la techniqueState of the art

De nombreux mouvements répondant à la définition qui précède sont connus dans l'art antérieur. A titre d'exemple, le brevet CH 694 349 délivré au nom de Franck Müller Watchland SA, décrit un mouvement de ce type destiné à afficher à la fois les minutes et les heures de manière rétrograde. Chacun des mécanismes correspondants comporte une bascule à deux bras reliés par un coude, dans la région duquel pivote la bascule par rapport au bâti du mouvement. L'extrémité libre d'un premier bras porte un palpeur disposé en appui contre la périphérie d'une came entraînée en rotation par le rouage de finissage du mouvement, tandis que l'extrémité libre du deuxième bras porte un râteau disposé en prise avec un mobile d'entraînement d'un organe d'affichage. Un ressort long est relié au bâti par une première de ses extrémités alors que sa deuxième extrémité est agencée de manière à appliquer une force sur la bascule, pour maintenir le palpeur au contact de la came.Numerous motions as defined above are known in the prior art. For example, the patent CH 694 349 issued in the name of Franck Müller Watchland SA, describes a movement of this type intended to display both the minutes and the hours in a retrograde way. Each of the corresponding mechanisms comprises a rocker with two arms connected by a bend, in the region of which pivots the rocker relative to the frame of the movement. The free end of a first arm carries a feeler disposed in abutment against the periphery of a cam driven in rotation by the movement finishing work train, while the free end of the second arm carries a rake arranged in engagement with a mobile drive of a display member. A long spring is connected to the frame by a first of its ends while its second end is arranged to apply a force on the rocker, to maintain the probe in contact with the cam.

Ce type de construction présente certains inconvénients, notamment liés à l'application, au rouage de finissage du mouvement, d'une force de frottement présentant une importante variation en amplitude entre deux positions extrêmes de la bascule. En effet, on constate, d'une part, que l'axe de rotation de la bascule est relativement éloigné du palpeur et, d'autre part, que le point d'appui du ressort sur la bascule est prévu au niveau du palpeur et est donc également éloigné de l'axe de rotation de la bascule. Ceci résulte en une amplitude importante des déformations du ressort entre l'une et l'autre des positions extrêmes de la bascule, soit une amplitude importante de la variation de la force que ce ressort applique sur la bascule. La bascule étant disposée en appui sur une came, elle-même entraînée en rotation par le rouage de finissage du mouvement, il s'ensuit une perturbation de la marche du mouvement qui peut présenter des valeurs non négligeables de déviation.This type of construction has certain drawbacks, in particular related to the application, to the gear train of the movement, of a friction force having a large variation in amplitude between two extreme positions of the rocker. Indeed, it is found, on the one hand, that the axis of rotation of the rocker is relatively far from the probe and, secondly, that the point of support of the spring on the rocker is provided at the probe and is therefore also distant from the axis of rotation of the rocker. This results in a large amplitude of the deformations of the spring between the one and the other of the extreme positions of the rocker, ie a large amplitude of the variation of the force that this spring applies to the rocker. The rocker being disposed in abutment on a cam, itself driven in rotation by the gear train of the movement, it follows a disturbance of the movement of the movement which may have significant values of deviation.

Le document FR 743.618 divulgue une deuxième came sur laquelle le ressort de rappel s'appuie.The document FR 743.618 discloses a second cam on which the return spring is supported.

Divulgation de l'inventionDisclosure of the invention

La présente invention, définie par la revendication 1, a pour but principal de pallier les inconvénients des mécanismes connus de l'art antérieur, en proposant un mouvement pour pièce d'horlogerie à affichage rétrograde dans lequel les moyens de mise en oeuvre de l'affichage rétrograde ne perturbent quasiment pas la marche du mouvement.The present invention, defined by claim 1, has for main purpose to overcome the disadvantages of the known mechanisms of the prior art, by proposing a movement for a retrograde timepiece in which the means for implementing the Retrograde display does not disturb the movement.

A cet effet, la présente invention concerne plus particulièrement un mouvement pour pièce d'horlogerie du type mentionné plus haut, caractérisé par le fait qu'un dispositif de régulation de la force est interposé entre les moyens élastiques et la bascule.For this purpose, the present invention more particularly relates to a movement for a timepiece of the type mentioned above, characterized in that a force regulating device is interposed between the elastic means and the rocker.

Grâce à cette caractéristique, le fonctionnement du mouvement présente une meilleure précision. En outre, cette précision est maintenue même dans le cas où le mouvement est adapté à l'entraînement d'un organe d'affichage sur un secteur angulaire important, notamment supérieur à 60 degrés, préférablement supérieur à 120 degrés.With this feature, the operation of the movement has a better accuracy. In addition, this accuracy is maintained even in the case where the movement is suitable for driving a display member over a large angular sector, in particular greater than 60 degrees, preferably greater than 120 degrees.

Dans un mode de réalisation préféré, il est prévu que le mobile est entraîné par une roue montée à friction sur un tube de roue à canon, la bascule comportant un râteau présentant une denture agencée en prise avec une denture d'un pignon monté libre en rotation sur le tube de roue à canon et solidaire en rotation d'un tube supplémentaire, ce dernier étant destiné à assurer l'entraînement, au moins indirectement, d'un organe d'affichage d'une information horaire.In a preferred embodiment, it is provided that the mobile is driven by a wheel frictionally mounted on a barrel wheel tube, the rocker having a rake having a toothing arranged in engagement with a toothing of a pinion mounted free in rotation on the barrel wheel tube and rotationally integral with an additional tube, the latter being intended to drive, at least indirectly, a display member of a time information.

Suivant une première réalisation, on peut prévoir que le dispositif de régulation de la force comprend une deuxième came disposée solidairement à la bascule en ayant même axe de rotation que cette dernière. Dans ce cas, les moyens élastiques comprennent préférablement un ressort long présentant une portion droite dont une extrémité libre est disposée en appui contre la périphérie de la deuxième came. Ainsi, l'application de la force sur la bascule est réalisée sous la forme d'un couple de rotation appliqué directement à son axe de rotation du fait de la force subie par la deuxième came.According to a first embodiment, it can be provided that the force regulation device comprises a second cam disposed integrally with the rocker having the same axis of rotation as the latter. In this case, the elastic means preferably comprise a long spring having a straight portion of which a free end is disposed in abutment against the periphery of the second cam. Thus, the application of the force on the rocker is carried out in the form of a rotational torque applied directly to its axis of rotation due to the force experienced by the second cam.

Suivant une seconde réalisation, on peut prévoir que le tube supplémentaire, destiné à porter l'organe d'affichage, est solidaire d'une came supplémentaire, de même axe de rotation et, présentant une périphérie de rayon variable destinée à coopérer avec un palpeur supplémentaire porté par une bascule supplémentaire, cette dernière présentant une surface d'appui agencée pour coopérer avec les moyens élastiques.According to a second embodiment, provision may be made for the additional tube intended to carry the display member to be integral with an additional cam having the same axis of rotation and having a periphery of variable radius intended to cooperate with a feeler. additional carried by an additional rocker, the latter having a bearing surface arranged to cooperate with the elastic means.

Dans ce cas, la bascule subit la force générée par les moyens élastiques par l'intermédiaire de son râteau, du pignon et de la came supplémentaire dont la périphérie permet de réguler la force effectivement transmise à la bascule.In this case, the rocker undergoes the force generated by the elastic means via its rake, the pinion and the additional cam whose periphery makes it possible to regulate the force effectively transmitted to the rocker.

On pourra préférablement prévoir que la périphérie de la came supplémentaire présente une forme correspondant au moins partiellement à une portion de courbe logarithmique.It is preferable to provide that the periphery of the additional cam has a shape corresponding at least partially to a logarithmic curve portion.

Par ailleurs, un galet pourra être porté par le palpeur supplémentaire pour assurer le contact entre la bascule supplémentaire et la périphérie de la came supplémentaire avec le moins de frottements possible.Furthermore, a roller may be carried by the additional probe to ensure the contact between the additional rocker and the periphery of the additional cam with the least possible friction.

De manière avantageuse, un tel mouvement peut être mis en oeuvre dans une pièce d'horlogerie comprenant un organe d'affichage d'une grandeur horaire balayant un secteur angulaire d'angle supérieur à 120 degrés, comme par exemple un affichage des heures sur un secteur de 270 degrés.Advantageously, such a movement can be implemented in a timepiece comprising a display member of a time magnitude scanning an angular sector of angle greater than 120 degrees, such as for example a display of hours on a clock. 270 degree sector.

Brève description des dessinsBrief description of the drawings

D'autres caractéristiques et avantages de la présente invention apparaîtront plus clairement à la lecture de la description détaillée d'un mode de réalisation préféré qui suit, faite en référence aux dessins annexés donnés à titre d'exemples non limitatifs et dans lesquels:Other features and advantages of the present invention will appear more clearly on reading the detailed description of a preferred embodiment which follows, made with reference to the accompanying drawings given by way of non-limiting examples and in which:

- la figure 1 représente une vue de dessus simplifiée d'un détail du mouvement pour pièce d'horlogerie selon une première variante d'un mode de réalisation préféré de la présente invention, dans une première configuration;- the figure 1 represents a simplified top view of a detail of the timepiece movement according to a first variant of a preferred embodiment of the present invention, in a first configuration;

- la figure 2 représente une vue de dessus simplifiée similaire à la vue de la figure 1, dans une deuxième configuration;- the figure 2 represents a simplified top view similar to the view of the figure 1 in a second configuration;

- la figure 3 représente une vue en coupe transversale simplifiée du mouvement des figures précédentes;- the figure 3 represents a simplified cross-sectional view of the movement of the preceding figures;

- la figure 4 représente une vue de dessus simplifiée d'un détail du mouvement pour pièce d'horlogerie selon une seconde variante d'un mode de réalisation préféré de la présente invention, et- the figure 4 represents a simplified top view of a detail of the timepiece movement according to a second variant of a preferred embodiment of the present invention, and

- la figure 5 représente une vue en coupe transversale simplifiée du mouvement de la figure 4.- the figure 5 represents a simplified cross-sectional view of the movement of the figure 4 .

Mode(s) de réalisation de l'inventionMode (s) of realization of the invention

La figure 1 représente une vue de dessus d'un détail de construction du mouvement selon une première variante d'un mode de réalisation préféré de la présente invention, plus particulièrement de son mécanisme de mise en oeuvre d'un affichage rétrograde. Ce mécanisme est présenté dans une première configuration sur la figure 1 alors qu'il sera présenté dans une deuxième configuration, différente, sur la figure 2.The figure 1 represents a top view of a construction detail of the movement according to a first variant of a preferred embodiment of the present invention, more particularly of its mechanism for implementing a retrograde display. This mechanism is presented in a first configuration on the figure 1 whereas it will be presented in a second configuration, different, on the figure 2 .

Le mode de réalisation décrit, à titre illustratif non limitatif, concerne un mécanisme d'entraînement d'une aiguille 1 d'indication des heures à affichage de type rétrograde, en particulier en relation avec un secteur gradué (non visible) s'étendant sur un angle de 270 degrés.The embodiment described, by way of nonlimiting illustration, concerns a mechanism for driving a pointer 1 for indicating the retrograde-type display hours, in particular in relation to a graduated sector (not visible) extending over an angle of 270 degrees.

On a schématiquement représenté, sur les figures, la mise en oeuvre du mouvement selon l'invention dans une pièce d'horlogerie comportant une boîte comprenant notamment une carrure 2. Le mouvement comprend une platine (non représentée) sur laquelle repose le module d'affichage et, dans un trou de laquelle est montée une tige de mise à l'heure 3, mieux visible sur la figure 3.FIGS are schematically represented in the implementation of the movement according to the invention in a timepiece comprising a box including a middle part 2. The movement comprises a plate (not shown) on which the module of display and, in a hole of which is mounted a time setting rod 3, better visible on the figure 3 .

L'aiguille des heures 1 est disposée au centre de la pièce d'horlogerie en étant entraînée par une roue à canon (référence 4, figure 3) dont le tube 5 porte un tube supplémentaire 6, monté libre en rotation sur la roue à canon. La roue à canon est entraînée de manière conventionnelle par un rouage de finissage (non visible) du mouvement, ce dernier pouvant être de type mécanique ou électromécanique sans incidence sur l'objet de la présente invention.The hour hand 1 is disposed at the center of the timepiece being driven by a cannon wheel (reference 4, figure 3 ) whose tube 5 carries an additional tube 6, mounted free to rotate on the barrel wheel. The barrel wheel is driven in a conventional manner by a work train (not visible) of the movement, the latter being of mechanical or electromechanical type without affecting the object of the present invention.

Une roue des heures 7 est également montée à friction sur le tube 5 de la roue à canon. Un mobile 8 est disposé à distance de la roue des heures 7 et porte une roue de commande 9 ainsi qu'une première came 10 dont la périphérie présente une forme en spirale. La roue de commande 9 et la première came 10 sont rendues solidaires en rotation, au moyen d'une goupille 11, et présentent un même axe de rotation 12 en référence au bâti du mouvement. La roue de commande 9 présente une denture périphérique agencée en prise avec la denture de la roue des heures 7, de manière que la première came 10 est entraînée en rotation, dans le sens anti-horaire sur la figure 1, par le mouvement de la roue des heures 7.An hour wheel 7 is also mounted frictionally on the tube 5 of the barrel wheel. A mobile 8 is disposed at a distance from the hour wheel 7 and carries a control wheel 9 and a first cam 10 whose periphery has a spiral shape. The control wheel 9 and the first cam 10 are made integral in rotation, by means of a pin 11, and have a same axis of rotation 12 with reference to the frame of the movement. The control wheel 9 has a peripheral toothing arranged in engagement with the toothing of the hour wheel 7, so that the first cam 10 is rotated, in the counter clockwise on the figure 1 , by the movement of the hour wheel 7.

Le mécanisme d'affichage rétrograde comporte en outre une bascule 20, montée à rotation sur le bâti du mouvement, selon un axe X situé à proximité immédiate de la périphérie de la roue de commande 9. Partant de sa région montée à pivot sur l'axe X, la bascule 20 présente deux bras 21 et 22.The retrograde display mechanism further comprises a rocker 20, rotatably mounted on the frame of the movement, along an axis X located in the immediate vicinity of the periphery of the control wheel 9. Starting from its region mounted to pivot on the X axis, the rocker 20 has two arms 21 and 22.

Le premier bras 21 comporte initialement deux portions 23 et 24 s'écartant l'une de l'autre avant de se rejoindre pour former une boucle dans le prolongement de laquelle s'étend un palpeur 25. L'extrémité libre 26 du palpeur, terminée en pointe, est disposée en appui contre la périphérie de la première came 10.The first arm 21 initially comprises two portions 23 and 24 deviating from each other before joining to form a loop in the extension of which extends a probe 25. The free end 26 of the probe, completed in point, is placed in abutment against the periphery of the first cam 10.

Le deuxième bras 22 présente une forme allongée et incurvée, pour contourner la première came 10, se terminant par un râteau 27, agencé en prise avec un pignon 28 solidaire du tube supplémentaire 6.The second arm 22 has an elongated and curved shape, to bypass the first cam 10, ending in a rake 27, arranged in engagement with a pinion 28 integral with the additional tube 6.

Une deuxième came 30 est montée à rotation sur l'axe X, en étant solidaire de la bascule 20. Celle-ci présente une périphérie en forme de coeur, plus précisément définie par une double courbure dont chacune correspond à une portion de courbe logarithmique.A second cam 30 is rotatably mounted on the X axis, being integral with the latch 20. The latter has a heart-shaped periphery, more precisely defined by a double curvature, each of which corresponds to a logarithmic curve portion.

Un ressort long 31 est fixé au bâti du mouvement, au moyen d'une vis 32, par une première extrémité 33 enroulée en forme d'anneau, tandis que sa seconde extrémité 34 présente une surface plane 35 disposée en appui contre la périphérie de la deuxième came 30. Une goupille 36, solidaire du bâti, forme un contre-appui pour empêcher la rotation du ressort dans le sens anti-horaire.A long spring 31 is fixed to the frame of the movement, by means of a screw 32, by a first end 33 wound in the form of a ring, while its second end 34 has a flat surface 35 arranged in abutment against the periphery of the second cam 30. A pin 36, integral with the frame, forms a counter-support to prevent the rotation of the spring in the counterclockwise direction.

On notera qu'il est important de veiller à limiter les frottements entre la surface plane 35 et la périphérie de la deuxième came 30. Ainsi, on pourra par exemple prévoir de recourir à un matériau tel que le rubis ou le saphir pour réaliser une extrémité rapportée sur le ressort long 31. De manière alternative, on pourra munir l'extrémité 34 d'un support portant un galet (tel que celui visible sur les figures 4 et 5) destiné à assurer le contact entre le ressort long 31 et la périphérie de la came 30.Note that it is important to ensure that the friction between the flat surface 35 and the periphery of the second cam 30 is limited. Thus, it is possible, for example, to use a material such as ruby or sapphire to make one end. attached to the long spring 31. Alternatively, the end 34 may be provided with a support carrying a roller (such as that visible on the figures 4 and 5 ) for ensuring contact between the long spring 31 and the periphery of the cam 30.

Du point de vue du fonctionnement, lorsque la première came 10 tourne dans le sens de rotation anti-horaire, elle présente un rayon croissant en regard de la position du palpeur 25, entraînant une rotation de la bascule 20 dans le même sens. Alors que la bascule tourne par rapport à son axe X, le râteau 27 induit un mouvement de rotation du tube supplémentaire 6, dans le sens horaire, celui-ci étant libre de tourner par rapport à la roue à canon. Ainsi, l'aiguille des heures 1 évolue en regard de graduations qui peuvent s'étendre par exemple sur douze heures entre les positions initiale et finale de l'aiguille, ces positions étant espacées d'un angle de 270 degrés suivant le présent mode de réalisation, à titre indicatif.From the point of view of operation, when the first cam 10 rotates in the counterclockwise direction of rotation, it has an increasing radius opposite the position of the probe 25, causing a rotation of the rocker 20 in the same direction. While the rocker rotates relative to its axis X, the rake 27 induces a rotational movement of the additional tube 6, in the clockwise direction, the latter being free to rotate relative to the barrel wheel. Thus, the hour hand 1 evolves with regard to graduations which can extend for example over twelve hours between the initial and final positions of the needle, these positions being spaced at an angle of 270 degrees according to the present method of realization, as an indication.

Dans le même temps, la deuxième came 30 tourne également dans le sens de rotation anti-horaire en déformant légèrement le ressort 31 au fur et à mesure de l'augmentation de son rayon dans la région de contact de la surface plane 35.At the same time, the second cam 30 also rotates in the anti-clockwise direction by slightly deforming the spring 31 as its radius increases in the region of contact of the flat surface 35.

La constante de raideur du ressort 31 est ajustée de telle manière que le contact de la pointe 26 du palpeur sur la périphérie de la première came est garanti à chaque instant, sans pour autant engendrer des frottements trop importants.The stiffness constant of the spring 31 is adjusted so that the contact of the tip 26 of the probe on the periphery of the first cam is guaranteed at every moment, without generating too much friction.

Le palpeur 25 présente ainsi un éloignement progressif et continu en référence à l'axe de rotation 12 de la première came 10. On a représenté des petites croix sur la périphérie de la première came pour repérer les positions correspondant respectivement à chacune des heures affichées par l'aiguille des heures 1 en regard des graduations.The probe 25 thus has a gradual and continuous distance with reference to the axis of rotation 12 of the first cam 10. Small crosses are shown on the periphery of the first cam to identify the positions respectively corresponding to each of the hours displayed by the hour hand 1 opposite the graduations.

La figure 2 représente une vue similaire à celle de la figure 1, dans une configuration différente du mécanisme d'affichage rétrograde, plus précisément, un peu moins de douze heures après la configuration de la figure 1, la première came 10 ayant effectué quasiment un tour complet dans cet intervalle. Suivant le mode de réalisation représenté, l'aiguille des heures 1 a subi un déplacement angulaire de l'ordre de 270 degrés dans le même temps.The figure 2 represents a view similar to that of the figure 1 , in a different configuration of the retrograde display mechanism, more precisely, a little less than twelve hours after the configuration of the figure 1 , the first cam 10 having performed almost a complete revolution in this interval. According to the embodiment shown, the hour hand 1 has undergone an angular displacement of the order of 270 degrees at the same time.

Il apparaît sur cette figure que, pendant que la pointe 26 du palpeur 25 a subi un déplacement d'amplitude maximale, la deuxième came 30 a effectué une rotation suivant un angle inférieur à 90 degrés. Son rayon entre les positions de la figure 1 et de la figure 2 ayant peu varié, le ressort 31 présente une tension limitée, toutefois suffisante pour exercer une pression sur la deuxième came 30, visant à la ramener dans sa position de la figure 1, lorsque la pointe du palpeur passe le flanc 40 de la périphérie de la première came 10. Ainsi, cette opération s'apparente à la remise à zéro des aiguilles d'indication d'un temps mesuré dans un mouvement horloger à fonction chronographe.It appears in this figure that while the tip 26 of the feeler 25 has undergone maximum amplitude displacement, the second cam 30 has rotated at an angle less than 90 degrees. Its radius between the positions of the figure 1 and some figure 2 having little variation, the spring 31 has a limited tension, however sufficient to exert pressure on the second cam 30, to bring it back to its position of the figure 1 , when the tip of the probe passes the flank 40 of the periphery of the first cam 10. Thus, this operation is similar to the reset of the indication hands of a time measured in a watch movement with chronograph function.

A la différence des mécanismes de l'art antérieur, la variation de tension du ressort entre ces deux positions extrêmes du palpeur présente avantageusement un impact négligeable sur la marche du rouage de finissage. Cette caractéristique particulière permet également l'utilisation de secteur d'indication de grandeurs horaires de plus grande amplitude angulaire qu'avec les mécanismes antérieurs.Unlike the mechanisms of the prior art, the spring tension variation between these two extreme positions of the probe advantageously has a negligible impact on the progress of the finishing train. This particular characteristic also allows the use of indication sector of hourly magnitudes of greater angular amplitude than with the previous mechanisms.

De plus, l'action du ressort sur la bascule, via la deuxième came 30, permet l'obtention d'un retour plus lent de l'aiguille des heures 1 dans sa position initiale que dans les pièces d'horlogerie selon l'art antérieur, dans lesquelles le ressort agit directement sur la bascule. On peut noter que la vitesse de retour théorique de l'aiguille est constante pendant la durée de ce mouvement du fait de l'utilisation d'une courbe logarithmique, ce qui n'est pas le cas si la came présente une périphérie dont la forme est basée sur la courbe d'Archimède, en particulier dans la région de la position de repos représentée sur la figure 1, c'est pourquoi la première est préférée.In addition, the action of the spring on the rocker, via the second cam 30, makes it possible to obtain a slower return of the hour hand 1 in its initial position than in the timepieces according to the art. previous, in which the spring acts directly on the rocker. It may be noted that the theoretical return speed of the needle is constant during the duration of this movement due to the use of a logarithmic curve, which is not the case if the cam has a periphery whose shape is based on the Archimedes curve, particularly in the rest position area shown on the figure 1 that is why the first is preferred.

La figure 3 représente une vue en coupe transversale simplifiée d'une partie du mouvement qui vient d'être décrit en relation avec les figures 1 et 2.The figure 3 represents a simplified cross-sectional view of a part of the movement which has just been described in relation to the figures 1 and 2 .

Il apparaît de cette figure que les axes de rotation commun 12 et X sont définis par l'utilisation de pivots uniques pour les pièces correspondantes, à savoir, d'une part, la roue de commande 9 et la première came 10 et, d'autre part, la bascule 20 et la deuxième came 30.It appears from this figure that the common rotation axes 12 and X are defined by the use of single pivots for the corresponding parts, namely, on the one hand, the control wheel 9 and the first cam 10 and, of on the other hand, the rocker 20 and the second cam 30.

Par ailleurs, il ressort de la figure 3 que la tige de mise à l'heure 3 porte, de manière conventionnelle, un pignon de remontoir 41 disposé en prise avec une roue de couronne 42 du mouvement, pour effectuer le remontage d'un ressort de barillet (non représenté), ainsi qu'un pignon coulant 43 qui peut être amené en prise avec un renvoi 44, lui-même en prise avec la roue à canon 4 pour effectuer la mise à l'heure des organes d'affichage.Moreover, it appears from figure 3 that the time setting rod 3 carries, in a conventional manner, a winding pinion 41 arranged in engagement with a crown wheel 42 of the movement, to effect the winding a barrel spring (not shown), and a sliding pinion 43 which can be brought into engagement with a return 44, itself engaged with the barrel wheel 4 to perform the time setting of display organs.

Lors des opérations de mise à l'heure, la roue des heures 7 est entraînée simultanément à la roue à canon 4 pour faire tourner la roue de commande 9 et la première came 10 et, par voie de conséquence, le tube supplémentaire 6 portant l'aiguille des heures 1.During the time setting operations, the hour wheel 7 is driven simultaneously with the barrel wheel 4 to rotate the control wheel 9 and the first cam 10 and, consequently, the additional tube 6 carrying the hour hand 1.

On peut noter qu'à partir de la position représentée sur la figure 1, une rotation de la première came 10 dans le sens anti-horaire n'est pas recommandée du fait que le palpeur 25 peut être appuyé contre le flanc 40 de la came. Dans ce cas, l'utilisateur devrait être en mesure de sentir une résistance et changer le sens de rotation de la tige de mise à l'heure pour effectuer l'opération de mise à l'heure. Si, malgré tout, il devait insister dans le mauvais sens de rotation, les surfaces respectives de la pointe du palpeur et du flanc de la came sont telles qu'une remontée du palpeur le long de celui-ci est possible.It can be noted that from the position represented on the figure 1 , a rotation of the first cam 10 in the counterclockwise direction is not recommended because the probe 25 may be pressed against the sidewall 40 of the cam. In this case, the user should be able to feel resistance and change the direction of rotation of the time-setting rod to perform the time setting operation. If, despite everything, he had to insist in the wrong direction of rotation, the respective surfaces of the tip of the probe and the side of the cam are such that a rise of the sensor along it is possible.

Les figures 4 et 5 représentent, respectivement en vue de dessus et en coupe transversale simplifiées, un module d'affichage pour mouvement horloger selon une seconde variante d'un mode de réalisation préféré de la présente invention.The figures 4 and 5 are, respectively in simplified top view and cross-sectional view, a display module for watch movement according to a second variant of a preferred embodiment of the present invention.

La seconde variante se distingue de la première par un agencement différent des moyens élastiques permettant d'assurer une bonne qualité de contact entre le palpeur 25 et la périphérie de la première came 10, les moyens de régulation de la force appliquée à la bascule étant adaptés en conséquence.The second variant differs from the first by a different arrangement of the elastic means to ensure a good quality of contact between the probe 25 and the periphery of the first cam 10, the force regulating means applied to the rocker being adapted Consequently.

Plus précisément, le tube supplémentaire 6 portant le pignon 28 est en outre solidaire d'une came supplémentaire 50 présentant une périphérie de rayon variable. Cette dernière présente, depuis son rayon le plus faible jusqu'à son rayon le plus grand, une forme correspondant à une portion de courbe logarithmique. Par ailleurs, les régions de plus faible rayon et de plus grand rayon sont reliées par un flanc 51 sensiblement radial.More specifically, the additional tube 6 carrying the pinion 28 is further secured to an additional cam 50 having a periphery of variable radius. The latter presents, from its lowest radius to its largest radius, a shape corresponding to a portion of a logarithmic curve. Furthermore, the regions of smaller radius and greater radius are connected by a substantially radial flank 51.

En outre, le module d'affichage selon la seconde variante de réalisation comprend en outre une bascule supplémentaire 52 montée rotative sur le bâti du mouvement, selon un axe de rotation situé à distance de l'axe de rotation de la roue à canon 4.In addition, the display module according to the second embodiment further comprises an additional rocker 52 rotatably mounted on the frame of the movement, along an axis of rotation located at a distance from the axis of rotation of the gun wheel 4.

La bascule supplémentaire 52 comprend une base 53 à partir de laquelle s'étend un bras 54 dont l'extrémité libre porte un palpeur 55, réalisé ici sous la forme d'un support 56 portant un galet 57 destiné à être disposé en appui contre la périphérie de la came supplémentaire 50. La mise en oeuvre d'un tel galet permet de réduire les frottements issus du contact entre le palpeur 55 et la périphérie de la came supplémentaire 50, lorsque cette dernière est entraînée en rotation sous l'effet de la coopération entre le râteau 27 et le pignon 28. Comme cela a déjà été mentionné, le galet peut être réalisé en rubis ou en saphir, à titre indicatif non limitatif.The additional rocker 52 comprises a base 53 from which extends an arm 54 whose free end carries a feeler 55, here made in the form of a support 56 carrying a roller 57 intended to be placed in abutment against the periphery of the additional cam 50. The implementation of such a roller makes it possible to reduce the friction arising from the contact between the feeler 55 and the periphery of the additional cam 50, when the latter is rotated under the effect of the cooperation between the rake 27 and the pinion 28. As has already been mentioned, the roller may be made of ruby or sapphire, as a non-limiting indicative.

Par ailleurs, la base 53 de la bascule supplémentaire comprend une surface d'appui 58 présentant la forme d'une arête.Furthermore, the base 53 of the additional rocker comprises a bearing surface 58 having the shape of an edge.

Un ressort long 61 est fixé au bâti du mouvement, au moyen d'une vis 62, par une première extrémité 63 enroulée en forme d'anneau, tandis que sa seconde extrémité 64, libre, est disposée en appui contre la surface d'appui 58 de la came supplémentaire 50. Une vis 66, solidaire du bâti, forme un contre-appui pour empêcher la rotation du ressort dans le sens horaire, permettant ainsi de provoquer sa déformation lorsque la surface d'appui 58 est entraînée en rotation dans le sens anti-horaire, sous l'effet de l'augmentation du rayon de la came supplémentaire 50.A long spring 61 is fixed to the frame of the movement, by means of a screw 62, by a first end 63 wound in the form of a ring, while its second end 64, free, is placed in abutment against the bearing surface. 58 of the additional cam 50. A screw 66, integral with the frame, forms a counter-support to prevent the rotation of the spring in the clockwise direction, thereby causing its deformation when the bearing surface 58 is rotated in the counter-clockwise, under the effect of increasing the radius of the additional cam 50.

La vis 66 est préférablement un excentrique grâce auquel l'orientation du ressort long 61 peut être ajustée avec une grande position.The screw 66 is preferably an eccentric whereby the orientation of the long spring 61 can be adjusted with a large position.

Du point de vue du fonctionnement, lorsque la première came 10 tourne dans le sens de rotation anti-horaire, elle présente un rayon croissant en regard de la position du palpeur 25, entraînant une rotation de la bascule 20 dans le même sens. Alors que la bascule tourne par rapport à son axe X, le râteau 27 induit un mouvement de rotation du tube supplémentaire 6, dans le sens horaire, celui-ci étant libre de tourner par rapport à la roue à canon. Ainsi, l'aiguille des heures 1 évolue en regard de graduations qui peuvent s'étendre par exemple sur douze heures entre les positions initiale et finale de l'aiguille.From the point of view of operation, when the first cam 10 rotates in the counterclockwise direction of rotation, it has an increasing radius opposite the position of the probe 25, causing a rotation of the rocker 20 in the same direction. While the rocker rotates relative to its axis X, the rake 27 induces a rotational movement of the additional tube 6, in the clockwise direction, the latter being free to rotate relative to the barrel wheel. Thus, the hour hand 1 evolves with respect to graduations that can extend for example over twelve hours between the initial and final positions of the needle.

Dans le même temps, la came supplémentaire 50 tourne simultanément dans le sens de rotation horaire, présentant ainsi un rayon croissant au palpeur 55 de la bascule supplémentaire 52 qui tourne, de ce fait, dans le sens anti-horaire. La rotation de la bascule supplémentaire entraîne une déformation progressive du ressort 61 au fur et à mesure de l'augmentation du rayon de la périphérie de la came supplémentaire.At the same time, the additional cam 50 rotates simultaneously in the clockwise direction, thus presenting an increasing radius to the probe 55 of the additional rocker 52 which rotates, therefore, in the counter-clockwise direction. The rotation of the additional rocker causes a progressive deformation of the spring 61 as the radius of the periphery of the additional cam increases.

Grâce à cette structure, la bascule 20 subit à chaque instant, sauf lors du bref mouvement rétrograde, deux forces antagonistes, à savoir une première force tendant à la faire tourner dans le sens anti-horaire et exercée par la périphérie de la première came 10, et une seconde force tendant à la faire tourner dans le sens horaire sous l'effet de la déformation du ressort 61, générant une force transmise à la bascule 20 par l'intermédiaire de la bascule supplémentaire 52, de son palpeur 55, de la périphérie de la came supplémentaire 50, du pignon 28 et du râteau 27.Thanks to this structure, the rocker 20 undergoes each moment, except during the brief retrograde movement, two opposing forces, namely a first force tending to turn it in the counterclockwise direction and exerted by the periphery of the first cam 10 , and a second force tending to turn it clockwise under the effect of the deformation of the spring 61, generating a force transmitted to the rocker 20 via the additional rocker 52, its probe 55, the periphery of the additional cam 50, the pinion 28 and the rake 27.

La force générée par la déformation du ressort 61 est régulée par la forme de la périphérie de la came supplémentaire 50 qui permet de contrôler le couple correspondant transmis au pignon 28. En référence à la première variante de réalisation, on notera que la régulation est effectuée ici avec une meilleure précision dans la mesure où la came supplémentaire 50 présente un angle de rotation bien supérieure à celui de la deuxième came 30 entre les deux positions extrêmes de l'organe d'affichage 1. En effet, la présente variante offre une démultiplication de la rotation de la bascule 20 au travers de la liaison par engrenage entre le râteau 27 et le pignon 28 permettant à la came supplémentaire 50 de présenter une plus grande portion utile de sa périphérie que celle de la deuxième came 30 de la première variante.The force generated by the deformation of the spring 61 is regulated by the shape of the periphery of the additional cam 50 which makes it possible to control the corresponding torque transmitted to the pinion 28. With reference to the first variant embodiment, it will be noted that the regulation is carried out here with a better precision insofar as the additional cam 50 has a rotation angle much greater than that of the second cam 30 between the two extreme positions of the display member 1. In fact, the present variant offers a reduction ratio the rotation of the rocker 20 through the gear connection between the rake 27 and the pinion 28 allowing the additional cam 50 to have a larger useful portion of its periphery than that of the second cam 30 of the first variant.

On peut également noter que cette construction, du fait des forces antagonistes qu'elle génère, présente l'avantage supplémentaire d'empêcher l'apparition d'un jeu au niveau de la liaison par engrenage prévue entre le pignon 28 et le râteau 27.It can also be noted that this construction, because of the antagonistic forces it generates, has the additional advantage of preventing the occurrence of a game at the level of the gear connection provided between the pinion 28 and the rake 27.

La constante de raideur du ressort 61 est ajustée de telle manière que le contact de la pointe 26 du palpeur sur la périphérie de la première came 10 est garanti à chaque instant, sans pour autant engendrer des frottements trop importants.The stiffness constant of the spring 61 is adjusted so that the contact of the tip 26 of the probe on the periphery of the first cam 10 is guaranteed at all times, without causing too much friction.

On a part ailleurs schématisé la présence d'un embrayage 70 pour assurer la liaison entre la roue de commande 9 et la première came 10, en toute sécurité, ce qui permet de pallier aux inconvénients mentionnés plus haut en relation avec les opérations de mise à l'heure.It is also schematized the presence of a clutch 70 to ensure the connection between the control wheel 9 and the first cam 10, safely, which overcomes the drawbacks mentioned above in connection with the operations of setting time.

La description qui précède correspond à un mode de réalisation préféré de l'invention décrit à titre non limitatif. En particulier, les formes représentées et décrites pour les différents éléments constitutifs du mouvement pour pièce d'horlogerie ne sont pas limitatives. On pourra notamment recourir à une came à courbe d'Archimède, pour la deuxième came et pour la came supplémentaire, malgré les inconvénients soulevés plus haut, le principe de l'invention restant inchangé dans ce cas. De même, la géométrie représentée et décrite pour la bascule est préférée car elle présente un bon compromis entre son encombrement et son équilibre d'un point de vue inertiel. La forme de la bascule permet en particulier d'avoir quasiment un alignement entre la pointe 26 du palpeur, l'axe de rotation 12 de la première came 10 et la région dans laquelle le râteau 27 et le pignon 28 sont en prises. En outre, cette géométrie permet de disposer l'axe de rotation de la bascule au voisinage immédiat de la came tout en ayant la possibilité d'appliquer la force du ressort à proximité de ce même axe. Ainsi, il est possible d'appliquer une force de rappel importante sur la bascule, tout en limitant grandement l'amplitude des déformations du ressort. Toutefois, l'homme du métier pourra choisir une géométrie de bascule différente en fonction de ses propres besoins.The foregoing description corresponds to a preferred embodiment of the invention described in a non-limiting manner. In particular, the shapes shown and described for the various constituent elements of the movement for a timepiece are not limiting. It will be possible to use an Archimedean curve cam, for the second cam and for the additional cam, despite the drawbacks mentioned above, the principle of the invention remaining unchanged in this case. Similarly, the geometry shown and described for the rocker is preferred because it presents a good compromise between its size and its balance from an inertial point of view. The shape of the rocker allows in particular to have almost an alignment between the tip 26 of the probe, the axis of rotation 12 of the first cam 10 and the region in which the rake 27 and the pinion 28 are engaged. In addition, this geometry makes it possible to arrange the axis of rotation of the rocker in the immediate vicinity of the cam while having the possibility of applying the force of the spring in the vicinity of this same axis. Thus, it is possible to apply a large restoring force on the rocker, while greatly limiting the amplitude of the deformations of the spring. However, the skilled person may choose a different rocker geometry according to his own needs.

A titre d'exemple, l'homme du métier ne rencontrera pas de difficulté particulière pour adapter le présent enseignement à ses propres besoins, notamment pour afficher des grandeurs horaires autres que l'heure, sans sortir du cadre de la présente invention comme défini par les revendications.By way of example, a person skilled in the art will not encounter any particular difficulty in adapting the present teaching to his own needs, in particular for displaying hourly quantities other than the hour, without departing from the scope of the present invention as defined by the revendications.

Claims (10)

  1. A display module, for a clockwork movement designed to drive a retrograde display organ (1) of at least one piece of time information, including a frame supporting
    - means for driving said retrograde display organ comprising a wheel and pinion (8) designed to be driven from a going train of the clockwork movement and supporting a first cam (10), with the same axis of rotation (12) as said wheel and pinion in reference to said frame,
    - a lever (20) supporting a feeler-spindle (25) arranged so as to bear against the periphery of said first cam under the effect of deformable elastic means (31, 61) undergoing a deformation of variable amplitude, driving the application of a corresponding force on said lever as a function of the distance separating said feeler-spindle from said axis of rotation (12) of said first cam, transmission means (27) being designed to connect said lever to said driving means,
    - a device for regulating said force inserted between said elastic means (31, 61) and said lever (20) and including a second cam (30, 50) connected to said lever (20) and having a periphery on which said force is applied, characterized in that said second cam (30, 50) has at least one portion of said periphery corresponding to a logarithmic curve portion.
  2. The display module according to claim 1, characterized in that said second cam (30) and said lever (20) have a same axis of rotation (X) in reference to said frame and are integral in rotation, and in that said second cam has a heart-shaped periphery.
  3. The display module according to claim 1, characterized in that said wheel and pinion (8) is driven by a wheel (7) integral with an hour wheel (4) tube (5), said lever (20) including a ratchet (27) having a toothing arranged engaged with a toothing of a pinion (28) mounted freely rotating on said hour wheel tube and integral in rotation with an additional tube (6) designed to ensure the driving of a display organ for a piece of time information (1).
  4. The display module according to claim 3, characterized in that said feeler-spindle (25), said axis of rotation of said first cam (10) and the region in which said ratchet (27) and said pinion (28) are engaged are essentially aligned.
  5. The display module according to any one of the preceding claims, characterized in that said bearing of said feeler-spindle (25) on said first cam (10) generates a frictional force that decreases when said distance between said feeler-spindle and said axis of rotation (12) of said first cam (10) increases.
  6. The display module according to one of the preceding claims, characterized in that sad elastic means include a long spring (31) having a straight portion whereof one free end (34, 35) is arranged bearing against the periphery of said second cam (30).
  7. The display module according to claim 1, characterized in that an additional tube (6), designed to carry said retrograde display organ (1), is integral with the second cam (50), with the same axis of rotation, and having a variable-radius periphery designed to cooperate with an additional feeler-spindle (55) supported by an additional lever (52) have a bearing surface (58) arranged to cooperate with said elastic means (61).
  8. The display module according to claim 7, characterized in that said additional feeler-spindle (55) supports a runner (57) arranged to ensure the contact between said additional lever (52) and the periphery of said additional cam (50).
  9. A clockwork movement designed to drive a retrograde display organ (1) for at least one piece of time information, including a frame supporting
    a going train
    means for driving said retrograde display organ comprising a wheel and pinion (8) arranged so as to be driven from said going train and supporting a first cam (10), with the same axis of rotation (12) as said wheel and pinion in reference to said frame,
    a lever (20) supporting a feeler-spindle (25) arranged so as to bear against the periphery of said first cam under the effect of deformable elastic means (31, 61) undergoing a deformation of variable amplitude, driving the application of a corresponding force on said lever, as a function of the distance separating said feeler-spindle from the axis of rotation (12) of said first cam, transmission means (27) designed to connect said lever to said driving means,
    characterized in that a device (30, 50) for regulating said force as defined in claim 1 is inserted between said elastic means (31, 61) and said lever (20).
  10. A timepiece comprising a case (2) closed by a glass wherein is housed a movement according to claim 9, arranged so as to drive a display organ (1) of at least one hour magnitude visible through said glass, characterized in that said hour magnitude is displayed on an angular sector whereof the angle is greater than 60 degrees, preferably greater than 120 degrees.
EP07727533A 2006-03-29 2007-03-29 Movement for timepiece with retrograde display Ceased EP2010971B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH00516/06A CH698826B1 (en) 2006-03-29 2006-03-29 Movement for a timepiece with retrograde.
PCT/EP2007/053061 WO2007110451A2 (en) 2006-03-29 2007-03-29 Movement for timepiece with retrograde display

Publications (2)

Publication Number Publication Date
EP2010971A2 EP2010971A2 (en) 2009-01-07
EP2010971B1 true EP2010971B1 (en) 2010-11-03

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Application Number Title Priority Date Filing Date
EP07727533A Ceased EP2010971B1 (en) 2006-03-29 2007-03-29 Movement for timepiece with retrograde display

Country Status (7)

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US (1) US7974156B2 (en)
EP (1) EP2010971B1 (en)
JP (1) JP5145323B2 (en)
CN (1) CN101438213B (en)
CH (1) CH698826B1 (en)
DE (1) DE602007010270D1 (en)
WO (1) WO2007110451A2 (en)

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US10222749B2 (en) 2016-02-18 2019-03-05 Blancpain Sa Retrograde timepiece display with a retractable hand
WO2017158536A1 (en) 2016-03-15 2017-09-21 Chanel Sa Genève Mechanism for a watch movement

Also Published As

Publication number Publication date
JP5145323B2 (en) 2013-02-13
WO2007110451A2 (en) 2007-10-04
EP2010971A2 (en) 2009-01-07
US20100246341A1 (en) 2010-09-30
WO2007110451A3 (en) 2008-05-15
US7974156B2 (en) 2011-07-05
DE602007010270D1 (en) 2010-12-16
CN101438213B (en) 2011-02-23
JP2009531689A (en) 2009-09-03
CN101438213A (en) 2009-05-20
CH698826B1 (en) 2009-11-13

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