EP3428738B1 - Drive and positioning system and jumper for implementing said system - Google Patents

Drive and positioning system and jumper for implementing said system Download PDF

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Publication number
EP3428738B1
EP3428738B1 EP17195976.0A EP17195976A EP3428738B1 EP 3428738 B1 EP3428738 B1 EP 3428738B1 EP 17195976 A EP17195976 A EP 17195976A EP 3428738 B1 EP3428738 B1 EP 3428738B1
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EP
European Patent Office
Prior art keywords
jumper
drive
feeler
positioning system
cam
Prior art date
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Application number
EP17195976.0A
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German (de)
French (fr)
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EP3428738A1 (en
Inventor
Stéphane von Gunten
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Manufacture et Fabrique de Montres et Chronometres Ulysse Nardin Le Locle SA
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Manufacture et Fabrique de Montres et Chronometres Ulysse Nardin Le Locle SA
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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B19/00—Indicating the time by visual means
    • G04B19/24—Clocks or watches with date or week-day indicators, i.e. calendar clocks or watches; Clockwork calendars
    • G04B19/243—Clocks or watches with date or week-day indicators, i.e. calendar clocks or watches; Clockwork calendars characterised by the shape of the date indicator
    • G04B19/247—Clocks or watches with date or week-day indicators, i.e. calendar clocks or watches; Clockwork calendars characterised by the shape of the date indicator disc-shaped
    • 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
    • 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
    • G04B11/02—Devices allowing the motion of a rotatable part in only one direction
    • G04B11/04—Pawl constructions therefor, e.g. pawl secured to an oscillating member actuating a ratchet
    • 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
    • G04B13/00—Gearwork
    • G04B13/002—Gearwork where rotation in one direction is changed into a stepping movement

Definitions

  • the present invention relates to the field of watchmaking. It relates, more particularly, to a drive and positioning system, particularly suitable for driving and positioning a display mobile, especially a jumping-type display mobile.
  • This type of system comprises a drive wheel, a driven wheel intended to be driven by the drive wheel, and a jumper comprising two inclined planes and a spring member arranged to press the inclined planes against the driven wheel and position it angularly.
  • the driven wheel generally carries the display mobile, although the latter can also be located further downstream in the kinematic chain.
  • a jumping-type display mobile is linked to a driven wheel, periodically driven by a driving wheel.
  • the driven wheel is positioned by a jumper, the inclined planes of which rest between two teeth or branches of the driven wheel.
  • the mobile display is therefore capable of occupying indexed positions, defined by the action of the jumper between the teeth or branches of the driven wheel. If the jumper keeps the display mobile in the indexed positions, it also participates in driving the driven wheel, by completing the step started by the driving wheel. Indeed, the latter drives the driven wheel by lifting the jumper and forcing the spring member until the top of the jumper located between the inclined planes passes between two following teeth or branches. Under the action of the spring member, the jumper then pushes the driven wheel to complete the angular drive pitch of the driven wheel.
  • the holding torque of the mobile display generated by the spring member is all the greater as the moment of inertia of the mobile display is large. Indeed, the spring member must be able to hold the mobile display in the event of significant accelerations, for example during shocks.
  • the torque taken from the movement to lift the jumper jumper during the first phase of driving the driven wheel can induce a loss of amplitude of the pendulum unacceptable, or even stop the movement.
  • the aim of the present invention is to propose a system for driving and positioning a mobile, in particular a mobile display, combining both very good positioning security and limiting the disturbances of the regulating member during moving from one indexed position to another.
  • the drive and positioning system comprises a synchronization cam driven by the drive wheel and a feeler comprising one end held in contact with the periphery of the synchronization cam and cooperating with the jumper, said synchronization and said feeler being arranged so as to exert on the jumper, at least when the n drive members cooperate with the driven wheel, a force whose moment relative to the axis of the jumper opposes the moment induced by the force exerted by the spring relative to said axis of the jumper.
  • this driving wheel 10 can be a 24h wheel, performing one revolution per 24h, and comprising a drive member 14 arranged to drive the driven wheel 12, in this case a 31 wheel, comprising 31 teeth, once a day.
  • the drive wheel 10 comprises a complete tooth forming the drive member 14, the other teeth being truncated.
  • the driven wheel 12 can integrally carry a display disc, not shown.
  • a person skilled in the art can obviously easily adapt the system to a date display of the large date type with a driven wheel with 12 to 10 positions for indicating the units, driving a tens wheel.
  • a person skilled in the art could also adapt the teaching of the present description to a display of other information.
  • the system according to the invention comprises a jumper 16.
  • the latter has a positioning zone, which can take the form of two inclined planes 18 and a spring member 20 arranged to press the zoned positioning 18 against the driven wheel 12.
  • the positioning zone 18 is made by inclined planes formed by a stone 21 arranged on a body 22 made of another material.
  • the positioning zone could also be produced by a cylindrical or semi-cylindrical body.
  • the stone could also be replaced by a part integrated into the jumper (piece in one piece).
  • the drive and positioning system further comprises a synchronization cam 24 driven by the driving wheel 10 and a feeler 26 comprising one end held in contact with the periphery of the cam and cooperating with the jumper 16.
  • the synchronization cam 24 and the feeler 26 are arranged so as to exert on the jumper 16, at least when the drive member 14 cooperates with the driven wheel 12, a force whose moment relative to the axis of the jumper opposes the moment induced by the force exerted by the spring, relative to said axis of the jumper.
  • the jumper 16 is pivotally mounted on a pivot axis.
  • the feeler 26 is integrally mounted (attached or in one piece) on the pivot axis.
  • the probe 26 comprises a base 26a pierced with an opening for mounting on the axis. From the base 26a, a lever 26b extends in the direction of the cam and its end is in contact with the periphery of the synchronization cam 24.
  • the lever 26b can be rigid or elastically deformable.
  • the latter comprises a slot 26c extending the edge of the lever 26b and which gives the lever 26b additional deformability in the plane of the system.
  • Base 26a of feeler 26 is integral with body 22 of jumper 16.
  • a pin 28 connects these two parts rigidly.
  • the feeler 26 In the case where the feeler 26 is elastically deformable, it exerts on the jumper 16, for a given deformation, a force whose moment relative to the axis of the jumper is greater than that induced by the force exerted by the spring member 20 on the jumper 16 and along the axis of rotation of the jumper, so that an action of the cam on the sensor 26 causes a movement of the jumper 16 and a deformation of the spring member 20.
  • the body of the jumper 22, the spring member 20 and the feeler can be made in one piece, for example with monolevel or multilevel etching techniques.
  • the synchronization cam 24 is mounted coaxial with the drive wheel 10. Although the illustrated solution is preferable, one could consider, for questions of position or size of the lever 26b, to arrange the cam 24 on another mobile, meshing directly or indirectly with the drive wheel 10.
  • the synchronization cam 24 can be integral with the driving wheel 10. Preferably, it is mounted loose on the axis of the driving wheel 10 and driven in rotation by the latter by means of a finger 30 integral with the driving wheel. 10 and which takes place in a groove 32 concentric with the axis of the drive wheel 10, formed in the cam 24. Thanks to this construction, as will be understood below, during the passage of the jumper 16, the support of the feeler 26 on cam 24 does not interfere with the second part of the jump, under the action of spring member 20, cam 24 being able to advance, thanks to the play between finger 30 and groove 32.
  • the drive wheel 10 comprises the groove, concentric with the axis of the synchronization cam.
  • the finger is integral with the synchronization cam and takes place in the groove.
  • the synchronization cam 24 defines a circular rest portion 24a having a first radius, and an active portion 24b having a radius greater than the first radius.
  • the first radius is sized as a function of the length of feeler 26 and of the respective position of cam 24 and feeler 26, so that jumper 16 is only subjected to the action of the member spring 20 when feeler 26 is in contact with circular rest portion 24a.
  • the active portion 24b has a variable radius, increasing then decreasing.
  • the active portion 24b is sized so that the jumper 16 is subjected to the combined action of the spring member 20 and of the feeler 26, when the latter is in contact with an active portion 24b.
  • the radius of the active portion is limited so that the displacement induced on the jumper 16 is less than the penetration of the jumper 16 between the teeth of the driven wheel 12. In other words, the jumper 16 remains in contact with the driven wheel 12, to position it and participate in its drive.
  • the synchronization cam 24 is angularly positioned on the drive wheel 10, so that the sensor 26 is located at the top of the cam 24, substantially when the beak of the jumper 16, located between the inclined planes 18, passes the tip of one tooth of the driven wheel 12.
  • the feeler 26 is in bearing on the rest portion 24a of the cam.
  • the driven wheel 12 and the mobile display it carries are positioned by the jumper 16 and its spring member 20 ( Fig. 1 ).
  • the cam 24 pivots by being pushed by the finger 30 which presses on a first end of the groove 32.
  • the feeler 26 begins to rise on the active portion 24b of the cam, it exerts on the jumper 16 a force whose moment by relative to the axis of rotation of the jumper tends to oppose the moment induced by the force exerted by the spring member 20, relative to said axis of rotation of the jumper.
  • the picture 2 illustrates the moment of passage from jumper 16 to the next interval.
  • feeler 26 is resting on the top of active portion 24b of synchronization cam 24.
  • the force applied to jumper 16 by feeler 26 is maximum, which consequently means that the force applied by jumper 16 on driven wheel 12, is minimal.
  • the torque that drive wheel 10 must apply to cause driven wheel 12 to rotate is therefore reduced.
  • feeler 26 presses on the part of active portion 24b whose radius decreases (taking the direction of rotation of the cam as a reference) and causes the cam to advance until the finger 30 presses against the second end of the groove 32. have all his strength to carry out the driving of the driven wheel 12, after the jump of the tooth on the jumper 16.
  • the maximum torque required to drive the driven wheel 12 is reduced, without reducing the force of the spring member 20 of the jumper 16, which allows to maintain good security.
  • n drive members 14 n ⁇ 2
  • the synchronization cam 24 can then be arranged on a mobile driven by the drive wheel 10, with a meshing ratio of n, that is to say that the mobile will turn n times faster than the drive wheel 10.
  • the synchronization cam 24 can also be arranged coaxially with drive wheel 10 and include n rest portions and n active portions.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
  • Transmission Devices (AREA)
  • Measurement Of Distances Traversed On The Ground (AREA)

Description

Domaine techniqueTechnical area

La présente invention se rapporte au domaine de l'horlogerie. Elle concerne, plus particulièrement, un système d'entraînement et de positionnement, particulièrement adapté pour entraîner et positionner un mobile d'affichage, spécialement un mobile d'affichage de type sautant. Ce genre de système comprend une roue menante, une roue menée destinée à être entraînée par la roue menante, et un sautoir comprenant deux plans inclinés et un organe ressort agencé pour presser les plans inclinés contre la roue menée et la positionner angulairement. La roue menée porte en général le mobile d'affichage, bien que celui-ci puisse aussi être situé plus en aval dans la chaine cinématique.The present invention relates to the field of watchmaking. It relates, more particularly, to a drive and positioning system, particularly suitable for driving and positioning a display mobile, especially a jumping-type display mobile. This type of system comprises a drive wheel, a driven wheel intended to be driven by the drive wheel, and a jumper comprising two inclined planes and a spring member arranged to press the inclined planes against the driven wheel and position it angularly. The driven wheel generally carries the display mobile, although the latter can also be located further downstream in the kinematic chain.

Etat de la techniqueState of the art

De manière courante, un mobile d'affichage de type sautant est lié à une roue menée, entraînée périodiquement par une roue menante. La roue menée est positionnée par un sautoir, dont les plans inclinés prennent appui entre deux dents ou branches de la roue menée. Le mobile d'affichage est donc susceptible d'occuper des positions indexées, définies par l'action du sautoir entre les dents ou branches de la roue menée. Si le sautoir permet de maintenir le mobile d'affichage dans les positions indexées, il participe également à l'entraînement de la roue menée, en terminant le pas commencé par la roue menante. En effet, celle-ci entraîne la roue menée en soulevant le sautoir et en contraignant l'organe ressort jusqu'à ce que le sommet du sautoir situé entre les plans inclinés passe entre deux dents ou branches suivantes. Sous l'action de l'organe ressort, le sautoir pousse alors la roue menée pour terminer le pas angulaire d'entraînement de la roue menée.Commonly, a jumping-type display mobile is linked to a driven wheel, periodically driven by a driving wheel. The driven wheel is positioned by a jumper, the inclined planes of which rest between two teeth or branches of the driven wheel. The mobile display is therefore capable of occupying indexed positions, defined by the action of the jumper between the teeth or branches of the driven wheel. If the jumper keeps the display mobile in the indexed positions, it also participates in driving the driven wheel, by completing the step started by the driving wheel. Indeed, the latter drives the driven wheel by lifting the jumper and forcing the spring member until the top of the jumper located between the inclined planes passes between two following teeth or branches. Under the action of the spring member, the jumper then pushes the driven wheel to complete the angular drive pitch of the driven wheel.

Le couple de maintien du mobile d'affichage généré par l'organe ressort est d'autant plus grand que le moment d'inertie du mobile d'affichage est grand. En effet, l'organe ressort doit pouvoir maintenir le mobile d'affichage en cas d'accélérations importantes, par exemple lors de chocs.The holding torque of the mobile display generated by the spring member is all the greater as the moment of inertia of the mobile display is large. Indeed, the spring member must be able to hold the mobile display in the event of significant accelerations, for example during shocks.

Dans certains cas, si la raideur et/ou le déplacement angulaire de l'organe ressort est trop importante, le couple prélevé sur le mouvement pour soulever le sautoir lors de la première phase de l'entraînement de la roue menée peut induire une perte d'amplitude du balancier inacceptable, voire stopper le mouvement.In some cases, if the stiffness and/or the angular displacement of the spring member is too high, the torque taken from the movement to lift the jumper jumper during the first phase of driving the driven wheel can induce a loss of amplitude of the pendulum unacceptable, or even stop the movement.

Il n'est pas toujours possible de réduire la raideur et/ou le déplacement angulaire de l'organe ressort sans porter préjudice à la sécurité du positionnement du mobile d'affichage. La présente invention a pour but de proposer un système d'entraînement et de positionnement d'un mobile, notamment d'un mobile d'affichage, combinant à la fois une très bonne sécurité du positionnement et limitant les perturbations de l'organe régulateur lors du passage d'une position indexée à une autre.It is not always possible to reduce the stiffness and/or the angular displacement of the spring member without prejudicing the security of the positioning of the display mobile. The aim of the present invention is to propose a system for driving and positioning a mobile, in particular a mobile display, combining both very good positioning security and limiting the disturbances of the regulating member during moving from one indexed position to another.

Les documents CH545500 et CH470703 dévoilent des exemples de systèmes de l'art antérieur qui essayent de résoudre ce problème.The documents CH545500 and CH470703 disclose examples of prior art systems which attempt to solve this problem.

Divulguation de l'inventionDisclosure of Invention

De façon plus précise, l'invention concerne un système d'entraînement et de positionnement d'un mobile d'affichage, comprenant :

  • une roue menante comportant n organes d'entraînement,
  • une roue menée destinée à être entraînée par les n organes d'entraînement,
  • un sautoir comprenant une zone de positionnement et un organe ressort agencé pour presser ladite zone de positionnement contre la roue menée et la positionner angulairement.
More specifically, the invention relates to a system for driving and positioning a mobile display, comprising:
  • a drive wheel comprising n drive members,
  • a driven wheel intended to be driven by the n drive members,
  • a jumper comprising a positioning zone and a spring member arranged to press said positioning zone against the driven wheel and position it angularly.

Selon l'invention, le système d'entraînement et de positionnement comprend une came de synchronisation entraînée par la roue menante et un palpeur comprenant une extrémité maintenue au contact de la périphérie de la came de synchronisation et coopérant avec le sautoir, ladite came de synchronisation et ledit palpeur étant agencés de manière à exercer sur le sautoir, au moins lorsque les n organes d'entraînement coopèrent avec la roue menée, une force dont le moment par rapport à l'axe du sautoir s'oppose au moment induit par la force exercée par le ressort par rapport audit axe du sautoir.According to the invention, the drive and positioning system comprises a synchronization cam driven by the drive wheel and a feeler comprising one end held in contact with the periphery of the synchronization cam and cooperating with the jumper, said synchronization and said feeler being arranged so as to exert on the jumper, at least when the n drive members cooperate with the driven wheel, a force whose moment relative to the axis of the jumper opposes the moment induced by the force exerted by the spring relative to said axis of the jumper.

Brève description des dessinsBrief description of the drawings

D'autres détails de l'invention apparaîtront plus clairement à la lecture de la description qui suit, faite en référence au dessin annexé dans lequel les figures 1 et 2 proposent deux vues d'un système d'entraînement et de positionnement selon l'invention, dans deux positions différentes.Other details of the invention will appear more clearly on reading the following description, made with reference to the appended drawing in which the figure 1 and 2 propose two views of a drive and positioning system according to the invention, in two different positions.

Mode de réalisation de l'inventionEmbodiment of the invention

Les figures représentent un système d'entraînement et de positionnement d'un mobile d'affichage selon l'invention. Seuls les éléments nécessaires à la compréhension de l'invention ont été représentés. Ainsi, on a une roue menante 10, destinée à être entraînée par un mouvement horloger et destinée à entraîner une roue menée 12. A titre d'exemple, cette roue menante 10 peut être une roue 24h, effectuant un tour par 24h, et comprenant un organe d'entraînement 14 agencé pour entraîner la roue menée 12, en l'espèce une roue de 31, comportant 31 dents, une fois par jour. Dans l'exemple, la roue menante 10 comprend une dent complète formant l'organe d'entraînement 14, les autres dents étant tronquées.The figures represent a system for driving and positioning a mobile display according to the invention. Only the elements necessary for understanding the invention have been represented. Thus, there is a driving wheel 10, intended to be driven by a watch movement and intended to drive a driven wheel 12. By way of example, this driving wheel 10 can be a 24h wheel, performing one revolution per 24h, and comprising a drive member 14 arranged to drive the driven wheel 12, in this case a 31 wheel, comprising 31 teeth, once a day. In the example, the drive wheel 10 comprises a complete tooth forming the drive member 14, the other teeth being truncated.

La roue menée 12 peut porter solidairement un disque d'affichage, non représenté. L'homme du métier peut évidemment adapter aisément le système à un affichage de quantième de type grande date avec une roue menée 12 à 10 positions pour l'indication des unités, entraînant une roue des dizaines. L'homme du métier pourra encore adapter l'enseignement de la présente description à un affichage d'une autre information.The driven wheel 12 can integrally carry a display disc, not shown. A person skilled in the art can obviously easily adapt the system to a date display of the large date type with a driven wheel with 12 to 10 positions for indicating the units, driving a tens wheel. A person skilled in the art could also adapt the teaching of the present description to a display of other information.

Pour positionner angulairement la roue menée 12 et participer à son entraînement, le système selon l'invention comprend un sautoir 16. Ce dernier présente une zone de positionnement, pouvant prendre la forme de deux plans inclinés 18 et un organe ressort 20 agencé pour presser la zone de positionnement 18 contre la roue menée 12. Dans le mode de réalisation proposé, la zone de positionnement 18 est réalisée par des plans inclinés formés par une pierre 21 agencée sur un corps 22 réalisé dans un autre matériau. La zone de positionnement pourrait aussi être réalisée par un corps cylindrique ou semi-cylindrique. La pierre pourrait aussi être remplacée par une partie intégrée au sautoir (pièce d'un seul tenant).To position the driven wheel 12 angularly and participate in its driving, the system according to the invention comprises a jumper 16. The latter has a positioning zone, which can take the form of two inclined planes 18 and a spring member 20 arranged to press the zoned positioning 18 against the driven wheel 12. In the proposed embodiment, the positioning zone 18 is made by inclined planes formed by a stone 21 arranged on a body 22 made of another material. The positioning zone could also be produced by a cylindrical or semi-cylindrical body. The stone could also be replaced by a part integrated into the jumper (piece in one piece).

Selon l'invention, le système d'entraînement et de positionnement comprend encore une came de synchronisation 24 entraînée par la roue menante 10 et un palpeur 26 comprenant une extrémité maintenue au contact de la périphérie de la came et coopérant avec le sautoir 16. Comme on le comprendra mieux par la suite, la came de synchronisation 24 et le palpeur 26 sont agencés de manière à exercer sur le sautoir 16, au moins lorsque l'organe d'entraînement 14 coopère avec la roue menée 12, une force dont le moment par rapport à l'axe du sautoir s'oppose au moment induit par la force exercée par le ressort, par rapport audit axe du sautoir.According to the invention, the drive and positioning system further comprises a synchronization cam 24 driven by the driving wheel 10 and a feeler 26 comprising one end held in contact with the periphery of the cam and cooperating with the jumper 16. As as will be better understood subsequently, the synchronization cam 24 and the feeler 26 are arranged so as to exert on the jumper 16, at least when the drive member 14 cooperates with the driven wheel 12, a force whose moment relative to the axis of the jumper opposes the moment induced by the force exerted by the spring, relative to said axis of the jumper.

Plus particulièrement au mode de réalisation illustré sur les dessins, le sautoir 16 est monté pivotant sur un axe de pivotement. Le palpeur 26 est monté solidaire (rapporté ou d'une pièce) sur l'axe de pivotement. Le palpeur 26 comprend une base 26a percée d'une ouverture pour le montage sur l'axe. De la base 26a, un levier 26b s'étend en direction de la came et son extrémité est au contact de la périphérie de la came de synchronisation 24.More particularly to the embodiment illustrated in the drawings, the jumper 16 is pivotally mounted on a pivot axis. The feeler 26 is integrally mounted (attached or in one piece) on the pivot axis. The probe 26 comprises a base 26a pierced with an opening for mounting on the axis. From the base 26a, a lever 26b extends in the direction of the cam and its end is in contact with the periphery of the synchronization cam 24.

Dans une variante non représentée, on pourrait également utiliser un palpeur monté sur un axe distinct, dont une première extrémité serait maintenue en appui sur la came et dont une autre extrémité exercerait un appui sur le sautoir 16.In a variant not shown, one could also use a feeler mounted on a separate axis, one end of which would be held in contact with the cam and the other end of which would exert pressure on the jumper 16.

Le levier 26b peut être rigide ou déformable élastiquement. Sur les figures, on voit que, à la jonction entre le levier 26b et la base 26a, cette dernière comporte une fente 26c prolongeant le bord du levier 26b et qui confère au levier 26b une déformabilité supplémentaire dans le plan du système. La base 26a du palpeur 26 est solidaire du corps 22 du sautoir 16. Par exemple, une goupille 28 relie ces deux pièces rigidement. Dans le cas où le palpeur 26 est déformable élastiquement, il exerce sur le sautoir 16, pour une déformation donnée, une force dont le moment par rapport à l'axe du sautoir est supérieur à celui induit par la force exercée par l'organe ressort 20 sur le sautoir 16 et selon l'axe de rotation du sautoir, afin qu'une action de la came sur le palpeur 26 entraîne un déplacement du sautoir 16 et une déformation de l'organe ressort 20.The lever 26b can be rigid or elastically deformable. In the figures, it can be seen that, at the junction between the lever 26b and the base 26a, the latter comprises a slot 26c extending the edge of the lever 26b and which gives the lever 26b additional deformability in the plane of the system. Base 26a of feeler 26 is integral with body 22 of jumper 16. For example, a pin 28 connects these two parts rigidly. In the case where the feeler 26 is elastically deformable, it exerts on the jumper 16, for a given deformation, a force whose moment relative to the axis of the jumper is greater than that induced by the force exerted by the spring member 20 on the jumper 16 and along the axis of rotation of the jumper, so that an action of the cam on the sensor 26 causes a movement of the jumper 16 and a deformation of the spring member 20.

Dans une variante avantageuse, le corps du sautoir 22, l'organe ressort 20 et le palpeur peuvent être réalisés d'une pièce, par exemple avec des techniques de gravure mononiveau ou multiniveaux.In an advantageous variant, the body of the jumper 22, the spring member 20 and the feeler can be made in one piece, for example with monolevel or multilevel etching techniques.

La came de synchronisation 24 est montée coaxiale avec la roue menante 10. Bien que la solution illustrée soit préférable, on pourrait envisager, pour des questions de position ou d'encombrement du levier 26b, de disposer la came 24 sur un autre mobile, engrenant directement ou indirectement avec la roue menante 10.The synchronization cam 24 is mounted coaxial with the drive wheel 10. Although the illustrated solution is preferable, one could consider, for questions of position or size of the lever 26b, to arrange the cam 24 on another mobile, meshing directly or indirectly with the drive wheel 10.

La came de synchronisation 24 peut être solidaire de la roue menante 10. De préférence, elle est montée folle sur l'axe de la roue menante 10 et entraînée en rotation par celle-ci au moyen d'un doigt 30 solidaire de la roue menante 10 et qui prend place dans une rainure 32 concentrique à l'axe de la roue menante 10, ménagée dans la came 24. Grâce à cette construction, comme on le comprendra ci-après, lors du passage du sautoir 16, l'appui du palpeur 26 sur la came 24 ne gêne pas la deuxième partie du saut, sous l'action de l'organe ressort 20, la came 24 pouvant prendre de l'avance, grâce au jeu entre le doigt 30 et la rainure 32. Une construction inverse pourrait également être envisagée, dans laquelle la roue menante 10 comporte la rainure, concentrique à l'axe de la came de synchronisation. Le doigt est solidaire de la came de synchronisation et prend place dans la rainure.The synchronization cam 24 can be integral with the driving wheel 10. Preferably, it is mounted loose on the axis of the driving wheel 10 and driven in rotation by the latter by means of a finger 30 integral with the driving wheel. 10 and which takes place in a groove 32 concentric with the axis of the drive wheel 10, formed in the cam 24. Thanks to this construction, as will be understood below, during the passage of the jumper 16, the support of the feeler 26 on cam 24 does not interfere with the second part of the jump, under the action of spring member 20, cam 24 being able to advance, thanks to the play between finger 30 and groove 32. A construction reverse could also be envisaged, in which the drive wheel 10 comprises the groove, concentric with the axis of the synchronization cam. The finger is integral with the synchronization cam and takes place in the groove.

Selon l'exemple, la came de synchronisation 24 définit une portion circulaire de repos 24a présentant un premier rayon, et une portion active 24b présentant un rayon plus grand que le premier rayon. De préférence, le premier rayon est dimensionné en fonction de la longueur du palpeur 26 et de la position respective, de la came 24 et du palpeur 26, de manière à ce que le sautoir 16 soit uniquement soumis à l'action de l'organe ressort 20 lorsque le palpeur 26 est au contact de la portion circulaire de repos 24a.According to the example, the synchronization cam 24 defines a circular rest portion 24a having a first radius, and an active portion 24b having a radius greater than the first radius. Preferably, the first radius is sized as a function of the length of feeler 26 and of the respective position of cam 24 and feeler 26, so that jumper 16 is only subjected to the action of the member spring 20 when feeler 26 is in contact with circular rest portion 24a.

La portion active 24b présente un rayon variable, augmentant puis diminuant. La portion active 24b est dimensionnée de manière à ce que le sautoir 16 soit soumis à l'action combinée de l'organe ressort 20 et du palpeur 26, lorsque ce dernier est au contact d'une portion active 24b. Le rayon de la portion active est limité de manière à ce que le déplacement induit sur le sautoir 16 est inférieur à la pénétration du sautoir 16 entre les dents de la roue menée 12. En d'autres termes, le sautoir 16 reste en contact de la roue menée 12, pour la positionner et participer à son entraînement.The active portion 24b has a variable radius, increasing then decreasing. The active portion 24b is sized so that the jumper 16 is subjected to the combined action of the spring member 20 and of the feeler 26, when the latter is in contact with an active portion 24b. The radius of the active portion is limited so that the displacement induced on the jumper 16 is less than the penetration of the jumper 16 between the teeth of the driven wheel 12. In other words, the jumper 16 remains in contact with the driven wheel 12, to position it and participate in its drive.

La came de synchronisation 24 est positionnée angulairement sur la roue menante 10, de manière à ce que le palpeur 26 soit situé au sommet de la came 24, sensiblement lorsque le bec du sautoir 16, situé entre les plans inclinés 18, passe la pointe d'une dent de la roue menée 12.The synchronization cam 24 is angularly positioned on the drive wheel 10, so that the sensor 26 is located at the top of the cam 24, substantially when the beak of the jumper 16, located between the inclined planes 18, passes the tip of one tooth of the driven wheel 12.

Ainsi, en fonctionnement, pendant l'essentiel du cycle d'entraînement de la roue menée 12, c'est-à-dire dans l'exemple pour une rotation d'environ 300° de la roue menante 10, le palpeur 26 est en appui sur la portion de repos 24a de la came. La roue menée 12 et le mobile d'affichage qu'elle porte sont positionnés par le sautoir 16 et son organe ressort 20 (Fig. 1).Thus, in operation, during most of the driving cycle of the driven wheel 12, that is to say in the example for a rotation of approximately 300° of the driving wheel 10, the feeler 26 is in bearing on the rest portion 24a of the cam. The driven wheel 12 and the mobile display it carries are positioned by the jumper 16 and its spring member 20 ( Fig. 1 ).

La came 24 pivote en étant poussée par le doigt 30 qui appuie sur une première extrémité de la rainure 32. Lorsque le palpeur 26 commence à monter sur la portion active 24b de la came, il exerce sur le sautoir 16 une force dont le moment par rapport à l'axe de rotation du sautoir tend à s'opposer au moment induit par la force exercée par l'organe ressort 20, par rapport audit axe de rotation du sautoir.The cam 24 pivots by being pushed by the finger 30 which presses on a first end of the groove 32. When the feeler 26 begins to rise on the active portion 24b of the cam, it exerts on the jumper 16 a force whose moment by relative to the axis of rotation of the jumper tends to oppose the moment induced by the force exerted by the spring member 20, relative to said axis of rotation of the jumper.

La figure 2 illustre le moment du passage du sautoir 16 à l'intervalle suivant. A ce moment, le palpeur 26 est en appui sur le sommet de la portion active 24b de la came de synchronisation 24. La force appliquée sur le sautoir 16 par le palpeur 26 est maximale, ce qui, par conséquent, entraîne que la force appliquée par le sautoir 16 sur la roue menée 12, est minimale. Le couple que la roue menante 10 doit appliquer pour entraîner la rotation de la roue menée 12, est donc réduit.The picture 2 illustrates the moment of passage from jumper 16 to the next interval. At this moment, feeler 26 is resting on the top of active portion 24b of synchronization cam 24. The force applied to jumper 16 by feeler 26 is maximum, which consequently means that the force applied by jumper 16 on driven wheel 12, is minimal. The torque that drive wheel 10 must apply to cause driven wheel 12 to rotate is therefore reduced.

Après le saut du sautoir 16, le palpeur 26 appuie sur la partie de la portion active 24b dont le rayon diminue (en prenant le sens de rotation de la came comme référence) et fait avancer la came jusqu'à ce que le doigt 30 s'appuie sur la deuxième extrémité de la rainure 32. Le palpeur 26 retombe donc très rapidement sur la portion de repos 24a, ce qui permet au sautoir 16 d'avoir toute sa force pour effectuer l'entraînement de la roue menée 12, après le saut de la dent sur le sautoir 16.After jumper 16 has jumped, feeler 26 presses on the part of active portion 24b whose radius decreases (taking the direction of rotation of the cam as a reference) and causes the cam to advance until the finger 30 presses against the second end of the groove 32. have all his strength to carry out the driving of the driven wheel 12, after the jump of the tooth on the jumper 16.

En examinant le couple de rotation prélevé par la roue menante 10 sur le mouvement, on constate que le déplacement du palpeur 26 sur la portion active 24b, induit un prélèvement de couple progressif qui intervient plus tôt dans la rotation de la roue menante 10, qu'un système de l'art antérieur avec un sautoir 16 traditionnel. Cependant, de manière très avantageuse, on constate également que le couple maximal prélevé au moment du passage du sautoir 16 sur la roue menée 12, est réduit, ce qui limite la perturbation subie par l'organe réglant du mouvement lors de ce passage.By examining the torque taken off by the drive wheel 10 on the movement, it is found that the movement of the feeler 26 on the active portion 24b, induces a progressive take-off of torque which occurs earlier in the rotation of the drive wheel 10, that a prior art system with a traditional jumper 16. However, very advantageously, it is also found that the maximum torque taken off when the jumper 16 passes over the driven wheel 12 is reduced, which limits the disturbance to which the regulating member of the movement is subjected during this passage.

Ainsi, grâce au système d'entraînement et de positionnement selon l'invention, le couple maximal nécessaire à l'entraînement de la roue menée 12, est réduit, sans diminuer la force de l'organe ressort 20 du sautoir 16, ce qui permet de conserver une bonne sécurité.Thus, thanks to the drive and positioning system according to the invention, the maximum torque required to drive the driven wheel 12 is reduced, without reducing the force of the spring member 20 of the jumper 16, which allows to maintain good security.

Si l'exemple ci-dessus se rapporte à un entraînement avec une roue 24h, entraînant une fois par jour une roue de 31, l'homme du métier pourra l'adapter avec une roue menante 10 entraînant la roue menée 12 plusieurs fois par tour et comportant, pour ce faire, n organes d'entraînement 14 (n ≥2). La came de synchronisation 24 peut alors être disposée sur un mobile entraîné par la roue menante 10, avec un rapport d'engrènement de n, c'est-à-dire que le mobile tournera n fois plus vite que la roue menante 10. La came de synchronisation 24 peut aussi être disposée coaxialement à la roue menante 10 et comporter n portions de repos et n portions actives.If the above example relates to a drive with a 24h wheel, driving a 31 wheel once a day, those skilled in the art can adapt it with a driving wheel 10 driving the driven wheel 12 several times per revolution. and comprising, to do this, n drive members 14 (n≥2). The synchronization cam 24 can then be arranged on a mobile driven by the drive wheel 10, with a meshing ratio of n, that is to say that the mobile will turn n times faster than the drive wheel 10. The synchronization cam 24 can also be arranged coaxially with drive wheel 10 and include n rest portions and n active portions.

Claims (10)

  1. Drive and positioning system for a display disc, comprising:
    - a driving wheel (10) comprising n drive members (14),
    - a driven wheel (12) intended to be driven by the n drive members (14),
    - a jumper (16) comprising a positioning zone (18) and a spring member (20) arranged to press the positioning zone (18) against the driven wheel (12) and to angularly position it,
    characterized in that it comprises a synchronization cam (24) driven by the driving wheel (10) and a feeler (26) comprising one end held in contact with the periphery of the synchronization cam (24) and cooperating with the jumper (16), said synchronization cam (24) and said feeler (26) being arranged in such a way as to exert on the jumper (16), at least when the n drive members (14) cooperate with the driven wheel (12), a force of which the moment with respect to the axis of rotation of the jumper opposes the moment induced by the force exerted by the spring, with respect to said axis of rotation of the jumper.
  2. Drive and positioning system according to Claim 1, characterized in that said feeler (26) is secured to the jumper (16).
  3. Drive and positioning system according to Claim 2, characterized in that said jumper (16) is securedly mounted to a pivot arbor, and in that the feeler (26) is secured to said pivot pin.
  4. Drive and positioning system according to one of the preceding claims, characterized in that the synchronization cam (24) is mounted coaxially with the driving wheel (10).
  5. Drive and positioning system according to Claim 4, characterized in that the synchronization cam (24) is mounted idly on the arbor of the driving wheel (10) .
  6. Drive and positioning system according to Claim 5, characterized in that the synchronization cam (24) comprises a groove (32) which is concentric to the axis of the driving wheel (10) and in which there is placed a finger (30) secured to the driving wheel (10) .
  7. Drive and positioning system according to Claim 5, characterized in that the driving wheel (10) comprises a groove (32) which is concentric to the axis of the synchronization cam (24) and in which there is placed a finger (30) secured to the synchronization cam (24).
  8. Drive and positioning system according to one of the preceding claims, characterized in that the synchronization cam (24) defines n circular rest portions having a first radius, and n active portions having a larger radius than the first radius, the jumper (16) being at least subjected to the action of the spring member (20) when the feeler (26) is in contact with a circular rest portion, the jumper (16) being subjected to the combined action of the spring member (20) and of the feeler (26) when the latter is in contact with an active portion.
  9. Drive and positioning system according to one of the preceding claims, characterized in that said feeler (26) is rigid.
  10. Drive and positioning system according to one of Claims 1 to 8, characterized in that said feeler (26) is elastically deformable.
EP17195976.0A 2016-10-24 2017-10-11 Drive and positioning system and jumper for implementing said system Active EP3428738B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH01416/16A CH713066A2 (en) 2016-10-24 2016-10-24 Driving and positioning system and jumper for the implementation of said system.

Publications (2)

Publication Number Publication Date
EP3428738A1 EP3428738A1 (en) 2019-01-16
EP3428738B1 true EP3428738B1 (en) 2022-02-16

Family

ID=60083142

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17195976.0A Active EP3428738B1 (en) 2016-10-24 2017-10-11 Drive and positioning system and jumper for implementing said system

Country Status (2)

Country Link
EP (1) EP3428738B1 (en)
CH (1) CH713066A2 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2066958A1 (en) * 1969-11-03 1971-08-13 Tissot Horlogerie

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH470703A (en) * 1965-06-14 1967-01-31 Montres Perret Et Berthoud Sa Timepiece comprising an instant-jump date mechanism
CH545500A (en) * 1970-06-29 1974-01-31 Omega Brandt & Freres Sa Louis Calendar watch

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2066958A1 (en) * 1969-11-03 1971-08-13 Tissot Horlogerie

Also Published As

Publication number Publication date
CH713066A2 (en) 2018-04-30
EP3428738A1 (en) 2019-01-16

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