EP3734372B1 - Device for actuating a toothed wheel of a clock mechanism - Google Patents

Device for actuating a toothed wheel of a clock mechanism Download PDF

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Publication number
EP3734372B1
EP3734372B1 EP19172297.4A EP19172297A EP3734372B1 EP 3734372 B1 EP3734372 B1 EP 3734372B1 EP 19172297 A EP19172297 A EP 19172297A EP 3734372 B1 EP3734372 B1 EP 3734372B1
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EP
European Patent Office
Prior art keywords
pawl
tooth
pivot point
driven
beak
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP19172297.4A
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German (de)
French (fr)
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EP3734372A1 (en
Inventor
Lukas Gisler
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Patek Philippe SA Geneve
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Patek Philippe SA Geneve
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Priority to EP19172297.4A priority Critical patent/EP3734372B1/en
Publication of EP3734372A1 publication Critical patent/EP3734372A1/en
Application granted granted Critical
Publication of EP3734372B1 publication Critical patent/EP3734372B1/en
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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
    • 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
    • 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
    • G04B19/253—Driving or releasing mechanisms
    • G04B19/25333—Driving or releasing mechanisms wherein the date indicators are driven or released mechanically by a clockwork movement
    • G04B19/25353—Driving or releasing mechanisms wherein the date indicators are driven or released mechanically by a clockwork movement driven or released stepwise by the clockwork movement
    • G—PHYSICS
    • G04—HOROLOGY
    • G04F—TIME-INTERVAL MEASURING
    • G04F7/00—Apparatus for measuring unknown time intervals by non-electric means
    • G04F7/04—Apparatus for measuring unknown time intervals by non-electric means using a mechanical oscillator
    • G04F7/08—Watches or clocks with stop devices, e.g. chronograph

Definitions

  • the present invention relates to a device for actuating a toothed wheel of a timepiece mechanism by driving a tooth to be driven from said toothed wheel, as defined in the appended claims.
  • Such an actuation device is generally used to drive a toothed wheel such as a star wheel.
  • these wheels or stars may have a large number of teeth, that is to say greater than or equal to 20, for example 24, 31 teeth or even more.
  • a chronograph mechanism for a wheel of an hour counter actuated once per hour by a rocker and which can comprise 24 teeth.
  • a star with 31 teeth is used to indicate the dates, this star being actuated once a day by a rocker.
  • a moon phase mechanism one can use, as an indicator of the phases of the moon over two lunations, a star of 59 teeth driven by one step per day.
  • a week-day mechanism indicating the number of the week of the year, a 53-tooth star is used.
  • the present invention aims to remedy the drawbacks of the known actuating mechanisms of a toothed wheel by proposing an actuating device making it possible to guarantee optimum torque transmission by working with a tooth close to the center line even if the toothed wheel includes a large number of teeth.
  • Another object of the present invention is to propose a device for actuating a toothed wheel making it possible to eliminate any slipping in or out between the actuating rocker and the toothed wheel.
  • the present invention relates to a device for actuating a toothed wheel of a watch mechanism by driving a tooth to be driven from said toothed wheel, said actuating device comprising an actuating rocker arranged to pivot at a first pivot point between an initial position and a maximum driving position of said tooth to be driven.
  • said actuating device comprises a pawl mounted free in rotation on said actuating rocker at a second pivot point, said pawl comprising a beak arranged to drive said tooth to be driven and a guide, as well as means guide arranged to cooperate with said guide when the actuating rocker moves between its initial position and its maximum drive position, said guide means being configured to positioning the pawl in a position of avoidance of a front tooth which precedes the tooth to be driven, according to which the distance from the nose of the pawl to the first pivot point is strictly less than the distance from the top of the said front tooth to the first point of pivoting, at least when the pawl nose passes the apex of the front tooth, and then to pivot the pawl relative to the second pivot point towards the sprocket into a position of engagement between the front tooth and the tooth to be driven, in which the distance from the beak to the first pivot point has increased with respect to the avoidance position, with a view to the gripping of the tooth to be driven by
  • the actuation device makes it possible to work with the tooth located closest to the center line in order to guarantee optimum torque transmission while ensuring good grip with the tooth to be driven as well as good avoidance safety of the front tooth, even with a wheel having a large number of teeth.
  • the actuation device according to the invention makes it possible to guarantee engagement of the pawl in the toothing as well as its disengagement without slipping.
  • the present invention also relates to a timepiece comprising an actuation device as defined above.
  • the present invention relates to a device 1 for actuating a toothed wheel 2 of a timepiece mechanism (not shown).
  • the toothed wheel 2 comprises 31 teeth and constitutes a date star of a date mechanism, actuated once a day by the actuating device 1, by driving a tooth to drive 3.
  • the actuating device 1 comprises an actuating rocker 4 formed of an arm, at the free end of which is mounted a pawl 6.
  • the rocker 4 is pivotally mounted on a frame element of the mechanism in one first pivot point A.
  • the rocker 4 is arranged to pivot between an initial position, when it is at rest and does not actuate the wheel 2, and a maximum drive position in which the driven by the pawl 6 is maximum .
  • the pawl 6 is mounted loose, or free in rotation, without friction, on said actuating rocker 4 at a second pivot point B.
  • the pawl 6 comprises a beak 8 arranged to cause the tooth to be driven 3 as well as a guide 10 whose role will be detailed below.
  • the guide 10 may for example be a pin fixed to the pawl 6.
  • the pawl 6 very roughly has a triangular shape, the first vertex of which is constituted by the beak 8, the second vertex being occupied by the pivot point B, and the guide 10 being fixed on the third vertex.
  • the actuating device 1 also comprises guide means arranged to cooperate with the guide 10 of the pawl 6 when the rocker actuation 4 moves between its initial position and its maximum drive position.
  • said guide means are configured to position the pawl 6 in a position of avoidance of a front tooth 12 which precedes by one step the tooth to be driven 3, avoidance position in which the beak 8 is remote from said front tooth 12 so that the distance d1 from the top of the beak 8 of the pawl 6 to the first pivot point A of the rocker 4 is strictly less, is preferably much less, than the distance d2 from the top of the said tooth front 12 to the first pivot point A, at least when the beak 8 of the pawl 6 passes the top of the front tooth 12.
  • the difference between the distance d2 from the top of the said front tooth 12 to the first pivot point A and the distance d1 from the top of the beak 8 of the pawl 6 to the first pivot point A is called the avoidance safety SE.
  • said guide means are configured so that, when the beak 8 of the pawl 6 passes the top of the front tooth 12, the pawl 6 being in the avoidance position, the avoidance safety SE of the front tooth 12 is greater than the difference between the distance d2 from the top of the front tooth 12 to the first pivot point A and the distance d3 from the top of the leading tooth 3 to the first pivot point A.
  • the guide means are configured so that, when the beak 8 passes the top of the front tooth 12, the pawl 6 being in the avoidance position, the avoidance security SE of the front tooth 12 is greater than 0.2 mm, preferably 0.3 mm.
  • the value of the SE avoidance safety device will be revised upwards.
  • the guide means are also configured to then cause the pawl 6 to pivot with respect to the second pivot point B in the direction of the toothed wheel 2 in a position of engagement between the front tooth 12 and the tooth to be driven 3, according to which the distance d1 from the top of the beak 8 of the pawl 6 to the first pivot point A of the rocker 4 has increased with respect to the distance d1 from the avoidance position, in order to position the beak 8 of the pawl 6 between the front tooth 12 and the tooth to be driven 3, with a view to the taking of the tooth to be driven 3 by the beak 8 of the pawl 6 for its training, as shown in figure 2 .
  • the distance d1 increases so that the beak 8 of the pawl is sufficiently engaged between the front tooth 12 and the tooth to be driven 3 early enough in order to have a security grip of the tooth to be driven 3 sufficient to allow a good grip with the tooth to be driven 3.
  • the safety of grip SP of the tooth to be driven 3 is defined as being the difference between the distance d1 from the top of the beak 8 of the pawl 6 to the first pivot point A and the distance d3 from the apex of leading tooth 3 at first pivot point A.
  • the guide means are configured so that, when the pawl 6 is in the engagement position, the safety grip SP with the tooth to be driven 3 is greater than or equal to the difference between the distance d2 from the top of the front tooth 12 at the first pivot point A and the distance d3 from the top of the tooth to lead 3 to the first pivot point A.
  • the value of the grip security SP will be higher than that chosen for a wristwatch for example.
  • the guide means are positioned with respect to the toothed wheel 2 so that the tooth to be driven 3 is the tooth closest to the line of centers 14, which connects the center C of the toothed wheel 2 and the first pivot point A of rocker 4.
  • the guide means comprise first guide means constituted by an opening 16 provided on a frame element of the timepiece mechanism and second guide constituted by an orienting element 18 movably mounted on a frame element of the watch mechanism.
  • the opening 16 can be made in the plate or any other plate of the frame.
  • the opening 16 comprises a first portion 16a of substantially oblong shape, and having a lower edge 20 arranged to cooperate with the guide 10 of the pawl 6 from the initial position of the rocker 4.
  • the edge 20 has a length and a shape allowing the pawl 6 to be in the avoidance position at least when its beak 8 exceeds the top of the front tooth 12.
  • the slope of the edge 20 can be downward in the direction of the toothed wheel 2 (as shown) or rising, the main thing being that the point S1 of the edge 20 of the first portion 16a on which the guide 10 rests when the beak 8 passes above the top of the front tooth 12 is positioned at a distance d4 from the first pivot point A chosen so that the beak 8 of the pawl 6 is sufficiently raised and far enough from the top of the front tooth 12 in order to respect the avoidance safety SE as defined above and to comfortably avoid the front tooth 12 .
  • the opening 16 also comprises a second portion 16b communicating with the first portion 16a and in which the guide 10 of the pawl 6 can circulate when said pawl 6 is brought into its engagement position, but also when it is moved to cause the tooth to drive 3 as well as to move into its release position and return to the initial position, as will be described below.
  • the second portion 16b is sufficiently flared in the direction of the toothed wheel 2 to allow the guide 10 to move in said second portion when the pawl 6 pivots with respect to its pivot point B in the direction of the wheel to be driven 2 to position itself in its engagement position. Then the second portion 16b forms a clearance zone in which the guide 10 can move until the rocker 4 reaches its maximum driving position as shown in picture 3 .
  • the second portion 16b is also dimensioned to allow the guide 10 to move there when the pawl 6 is brought into its disengaged position and the latch returns to its initial position, as will be described below.
  • the orienting element 18 comprises a spring.
  • the orienting element can be a spring, of the jumper type, or a pivoting part having the appropriate shape described below, and returned by a spring.
  • the orienting element 18 or the spring comprises a first inclined plane 22a and a second inclined plane 22b joined by their apex S2.
  • the first inclined plane 22a is arranged to cooperate with the guide 10 of the pawl 6 after the beak 8 has passed the top of the front tooth 12 in order to cause the pawl 6 to pivot with respect to the second pivot point B and bring it into its engagement position as shown in the figure 2 .
  • the slope of the first inclined plane 22a is downward in the direction of the toothed wheel 2, its angle of inclination and its length being chosen so that the top S2 of the orienting element or spring 18 against which the guide 10 s presses when the pawl 6 reaches its engagement position is positioned at a distance d5 from the first pivot point A such that the pawl 6 has pivoted sufficiently in the direction of the toothed wheel 2 so that its beak 8 is sufficiently engaged between the tooth before 12 and the tine to drive 3 and early enough and that it is at the distance d1 allowing to respect the safety grip of the tine to drive 3 as defined above so as to guarantee a good grip with the tine to lead 3 well before said tooth to lead 3.
  • the second inclined plane 22b of the orienting element or spring 18 is arranged to cooperate with the guide 10 of the pawl 6 when the actuating rocker 4 returns to its initial position in order to move the said orienting element or spring 18 movable to allow bring the pawl 6 into an unlatching position as shown in the figure 4 .
  • the second inclined plane 22b is configured so that the guide 10 comes into contact with it when the pawl 6, pushed back by the front tooth 12 when rocker 4 returns to its initial position, pivots with respect to its pivot point B away from wheel 2.
  • Guide 10 raises orienting element 18 to separate it and allow rocker 4 and pawl 6 in initial position.
  • the directing element or spring 18 then returns to its normal position.
  • the orientation of the inclined planes 22a and 22b of the orienting element or spring 18 is defined so that the engagement or disengagement of the pawl 6 under the effect of the guide 10 can be done without unnecessary effort. .
  • the operation of the actuating device of the invention is as follows: when the wheel 2 must be actuated by one step, the rocker 4 is controlled to leave its initial position and pivot counterclockwise around its pivot point A to move the pawl 6 in the direction of the wheel 2.
  • the pawl 6 moves, its guide 10 rests on the edge 20 of the first portion 16a of the opening 16 so that the beak 8 of the pawl 6, free to pivot around its pivot point B, follows the movement imposed by the edge 20 of the opening 16.
  • the guide 10 arrives at the point S1 of the edge 20, the pawl 6 is positioned in its avoidance position with respect to the front tooth 12 chosen to comfortably avoid the front tooth 12 and respect the safety avoidance SE of the front tooth 12 as defined above, as represented on the figure 1 .
  • guide 10 also moves in opening 16 and comes into abutment against first inclined plane 22a of orienting element 18 so that pawl 6 pivots around its point of pivoting B in the clockwise direction to be brought into its engagement position sufficiently before the tine to be driven 3 while respecting the grip safety SP with the tine to be driven 3 as defined above, as represented on the figure 2 .
  • rocker 4 returns to its initial position by pivoting around its pivot point A clockwise.
  • the pawl 6, abutting against the front tooth 12 pivots around its pivot point B in the counterclockwise direction so that its guide 10 abuts against the second inclined plane 22b of the orienting element 18 to lift it and move it aside in order to allow the pawl 6 to move into its unlatched position as shown in the figure 4 .
  • rocker 4 and pawl 6 return to their respective initial positions, guide 10 circulating in opening 16 to return to first portion 16a of said opening 16.
  • the actuation device makes it possible to position the beak 8 of the pawl 6 very precisely between the front tooth 12 and the tooth to be driven 3 to ensure good penetration with the tooth to be driven 3, while having avoided the front tooth 12 with a high avoidance safety, and this even if the toothed wheel to be actuated has a large number of teeth, the division between the safety of engagement with the tooth to be driven and the avoidance safety of the front tooth being then tight.
  • the toothed wheel 2 can comprise at least 20 teeth, preferably at least 24 teeth.
  • the toothed wheel 2 may for example be a 31-tooth date star of a date mechanism, and more particularly a perpetual calendar mechanism, actuated by the large rocker.
  • the toothed wheel can also be any other toothed wheel or star having a large number of teeth and actuated by a rocker or a lever in a watch mechanism.
  • the actuation device according to the invention is particularly suitable when the watch mechanism requires the use of a rocker or a very long lever which, without the device of the invention, would have the effect of impairing the avoidance and grip securities.
  • the pawl 6 being loosely mounted on the rocker 4, is easy to pivot to engage in the teeth or disengage from them with precision, so that any slipping in or out between the pawl 6 and the wheel 2 is deleted.
  • the orienting element 18 in the form of a spring advantageously makes it possible to eliminate the on-board large rocker pawl spring usually used in a standard perpetual calendar mechanism. Indeed, such a spring of very low force is complicated to produce in a standard perpetual calendar mechanism in which the large pawl acting on the star of 31 is integral with the large rocker.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Unknown Time Intervals (AREA)
  • Electromechanical Clocks (AREA)

Description

La présente invention concerne un dispositif d'actionnement d'une roue dentée d'un mécanisme horloger par entrainement d'une dent à mener de ladite roue dentée, tel que défini dans les revendications annexées.The present invention relates to a device for actuating a toothed wheel of a timepiece mechanism by driving a tooth to be driven from said toothed wheel, as defined in the appended claims.

Un tel dispositif d'actionnement est généralement utilisé pour entrainer une roue dentée telle qu'une étoile. Dans certains mécanismes horlogers, ces roues ou étoiles peuvent avoir un nombre de dents important, c'est-à-dire supérieur ou égal à 20, par exemple 24, 31 dents ou plus encore. Par exemple, on peut prévoir dans un mécanisme de chronographe, une roue d'un compteur d'heure actionnée une fois par heure par une bascule et qui peut comprendre 24 dents. Dans les mécanismes de quantième, on utilise une étoile avec 31 dents pour indiquer les quantièmes, cette étoile étant actionnée une fois par jour par une bascule. Dans un mécanisme de phases de lune, on peut utiliser, comme indicateur des phases de la lune sur deux lunaisons, une étoile de 59 dents entrainée d'un pas par jour. Dans un mécanisme de semainier indiquant le numéro de la semaine de l'année, on utilise une étoile de 53 dents.Such an actuation device is generally used to drive a toothed wheel such as a star wheel. In certain horological mechanisms, these wheels or stars may have a large number of teeth, that is to say greater than or equal to 20, for example 24, 31 teeth or even more. For example, provision can be made in a chronograph mechanism for a wheel of an hour counter actuated once per hour by a rocker and which can comprise 24 teeth. In the date mechanisms, a star with 31 teeth is used to indicate the dates, this star being actuated once a day by a rocker. In a moon phase mechanism, one can use, as an indicator of the phases of the moon over two lunations, a star of 59 teeth driven by one step per day. In a week-day mechanism indicating the number of the week of the year, a 53-tooth star is used.

Toutefois, lorsqu'une roue ou une étoile présentant un nombre de dents supérieur à 20 est entrainée par une bascule ou un levier de grande longueur, cette grande longueur pouvant être imposée par exemple par la disposition des mobiles, l'amplitude angulaire disponible sur le levier menant ou le temps de passage souhaité, il est difficile, voire impossible, de travailler avec la dent la plus proche de la ligne des centres (droite qui relie les centres de rotation de la roue et de la bascule). Or travailler avec la dent la plus proche de la ligne des centres permet de garantir une transmission de couple optimale. Plus le nombre de dents de la roue ou de l'étoile est élevé, plus le partagement entre la sécurité de prise avec la dent à mener (c'est-à-dire la différence entre la distance du bec de la bascule à son point de pivotement et la distance du sommet de la dent à mener au point de pivotement de la bascule) et la sécurité d'évitement de la dent précédente (c'est-à-dire la différence entre la distance du sommet de la dent précédente au point de pivotement de la bascule et la distance du bec de la bascule à son point de pivotement) est serré.However, when a wheel or a star having a number of teeth greater than 20 is driven by a rocker or a lever of great length, this great length being able to be imposed for example by the arrangement of the mobiles, the angular amplitude available on the driving lever or the desired dwell time, it is difficult, if not impossible, to work with the tooth closest to the line of centers (the straight line that connects the centers of rotation of the wheel and the rocker). However, working with the tooth closest to the center line guarantees optimal torque transmission. The greater the number of teeth of the wheel or star, the greater the sharing between the security of grip with the tooth to be driven (that is, the difference between the distance from the beak of the seesaw to its point pivot point and the distance from the top of the tine to lead to the pivot point of the seesaw) and the avoidance safety of the previous tine (i.e. the difference between the distance from the top of the previous tine to the pivot point of the seesaw and the distance from the tip of the seesaw to its pivot point) is tight.

Une solution pour résoudre ce problème est de travailler avec la dent située un ou deux pas avant la dent à mener idéale. Toutefois cela a pour inconvénient d'amoindrir la qualité de transmission de force en raison d'un rapport des bras de levier défavorable, tout en provoquant un glissement « rentrant » négatif lorsque le bec de la bascule pénètre dans la denture de la roue.One solution to this problem is to work with the tine located one or two steps before the ideal leading tine. However, this has the drawback of reducing the quality of transmission of force due to an unfavorable ratio of the lever arms, while causing a negative “returning” slip when the beak of the rocker enters the toothing of the wheel.

La présente invention vise à remédier aux inconvénients des mécanismes d'actionnement d'une roue dentée connus en proposant un dispositif d'actionnement permettant de garantir une transmission de couple optimale en travaillant avec une dent proche de la ligne des centres même si la roue dentée comprend un grand nombre de dents.The present invention aims to remedy the drawbacks of the known actuating mechanisms of a toothed wheel by proposing an actuating device making it possible to guarantee optimum torque transmission by working with a tooth close to the center line even if the toothed wheel includes a large number of teeth.

Un autre but de la présente invention est de proposer un dispositif d'actionnement d'une roue dentée permettant de supprimer tout glissement rentrant ou sortant entre la bascule d'actionnement et la roue dentée.Another object of the present invention is to propose a device for actuating a toothed wheel making it possible to eliminate any slipping in or out between the actuating rocker and the toothed wheel.

A cet effet, la présente invention concerne un dispositif d'actionnement d'une roue dentée d'un mécanisme horloger par entrainement d'une dent à mener de ladite roue dentée, ledit dispositif d'actionnement comprenant une bascule d'actionnement agencée pour pivoter en un premier point de pivotement entre une position initiale et une position maximale d'entrainement de ladite dent à mener.To this end, the present invention relates to a device for actuating a toothed wheel of a watch mechanism by driving a tooth to be driven from said toothed wheel, said actuating device comprising an actuating rocker arranged to pivot at a first pivot point between an initial position and a maximum driving position of said tooth to be driven.

Selon l'invention, ledit dispositif d'actionnement comprend un cliquet monté libre en rotation sur ladite bascule d'actionnement en un second point de pivotement, ledit cliquet comprenant un bec agencé pour entrainer ladite dent à mener et un guide, ainsi que des moyens de guidage agencés pour coopérer avec ledit guide lorsque la bascule d'actionnement évolue entre sa position initiale et sa position maximale d'entrainement, lesdits moyens de guidage étant configurés pour positionner le cliquet dans une position d'évitement d'une dent avant qui précède la dent à mener, selon laquelle la distance du bec du cliquet au premier point de pivotement est strictement inférieure à la distance du sommet de ladite dent avant au premier point de pivotement, au moins quand le bec du cliquet dépasse le sommet de la dent avant, et pour ensuite faire pivoter le cliquet par rapport au second point de pivotement en direction de la roue dentée dans une position d'engagement entre la dent avant et la dent à mener, selon laquelle la distance du bec au premier point de pivotement a augmenté par rapport à la position d'évitement, en vue de la prise de la dent à mener par le bec du cliquet pour son entraînement, et où les moyens de guidage sont positionnés par rapport à la roue dentée de sorte que la dent à mener est la dent la plus proche de la ligne des centres.According to the invention, said actuating device comprises a pawl mounted free in rotation on said actuating rocker at a second pivot point, said pawl comprising a beak arranged to drive said tooth to be driven and a guide, as well as means guide arranged to cooperate with said guide when the actuating rocker moves between its initial position and its maximum drive position, said guide means being configured to positioning the pawl in a position of avoidance of a front tooth which precedes the tooth to be driven, according to which the distance from the nose of the pawl to the first pivot point is strictly less than the distance from the top of the said front tooth to the first point of pivoting, at least when the pawl nose passes the apex of the front tooth, and then to pivot the pawl relative to the second pivot point towards the sprocket into a position of engagement between the front tooth and the tooth to be driven, in which the distance from the beak to the first pivot point has increased with respect to the avoidance position, with a view to the gripping of the tooth to be driven by the beak of the pawl for its drive, and in which the guide means are positioned relative to the sprocket so that the tooth to be driven is the tooth closest to the center line.

Ainsi, le dispositif d'actionnement selon l'invention permet de travailler avec la dent située la plus proche de la ligne des centres afin de garantir une transmission de couple optimale tout en assurant une bonne prise avec la dent à mener ainsi qu'une bonne sécurité d'évitement de la dent avant, et cela même avec une roue ayant un grand nombre de dents.Thus, the actuation device according to the invention makes it possible to work with the tooth located closest to the center line in order to guarantee optimum torque transmission while ensuring good grip with the tooth to be driven as well as good avoidance safety of the front tooth, even with a wheel having a large number of teeth.

De plus, le dispositif d'actionnement selon l'invention permet de garantir un engagement du cliquet dans la denture ainsi que son dégagement sans glissement.In addition, the actuation device according to the invention makes it possible to guarantee engagement of the pawl in the toothing as well as its disengagement without slipping.

La présente invention concerne également une pièce d'horlogerie comprenant un dispositif d'actionnement tel que défini ci-dessus.The present invention also relates to a timepiece comprising an actuation device as defined above.

D'autres caractéristiques et avantages de la présente invention apparaîtront à la lecture de la description détaillée suivante d'un mode de réalisation de l'invention, donné à titre d'exemple non limitatif, et faite en référence aux dessins annexés dans lesquels :

  • la figure 1 représente une vue d'un dispositif d'actionnement d'une roue dentée d'un mécanisme horloger selon l'invention, le cliquet étant dans une position d'évitement ;
  • la figure 2 représente une vue du dispositif d'actionnement selon l'invention, le cliquet étant dans une position d'engagement ;
  • la figure 3 représente une vue du dispositif d'actionnement selon l'invention, la bascule d'actionnement étant dans sa position maximale d'entrainement; et
  • la figure 4 représente une vue du dispositif d'actionnement selon l'invention, le cliquet étant dans une position de décliquetage.
Other characteristics and advantages of the present invention will appear on reading the following detailed description of an embodiment of the invention, given by way of non-limiting example, and made with reference to the appended drawings in which:
  • the figure 1 shows a view of a device for actuating a toothed wheel of a timepiece mechanism according to the invention, the pawl being in an avoidance position;
  • the figure 2 shows a view of the actuating device according to the invention, the pawl being in an engagement position;
  • the picture 3 shows a view of the actuating device according to the invention, the actuating rocker being in its maximum driving position; and
  • the figure 4 shows a view of the actuating device according to the invention, the pawl being in a detent position.

En référence à la figure 1, la présente invention concerne un dispositif d'actionnement 1 d'une roue dentée 2 d'un mécanisme horloger (non représenté). Dans l'exemple représenté ici, la roue dentée 2 comprend 31 dents et constitue une étoile de quantième d'un mécanisme de quantième, actionnée une fois par jour par le dispositif d'actionnement 1, par entrainement d'une dent à mener 3.With reference to the figure 1 , the present invention relates to a device 1 for actuating a toothed wheel 2 of a timepiece mechanism (not shown). In the example represented here, the toothed wheel 2 comprises 31 teeth and constitutes a date star of a date mechanism, actuated once a day by the actuating device 1, by driving a tooth to drive 3.

A cet effet, le dispositif d'actionnement 1 comprend une bascule d'actionnement 4 formée d'un bras, à l'extrémité libre duquel est monté un cliquet 6. La bascule 4 est montée pivotante sur un élément de bâti du mécanisme en un premier point de pivotement A. La bascule 4 est agencée pour pivoter entre une position initiale, lorsqu'elle est au repos et n'actionne pas la roue 2, et une position maximale d'entrainement dans laquelle la menée par le cliquet 6 est maximale.To this end, the actuating device 1 comprises an actuating rocker 4 formed of an arm, at the free end of which is mounted a pawl 6. The rocker 4 is pivotally mounted on a frame element of the mechanism in one first pivot point A. The rocker 4 is arranged to pivot between an initial position, when it is at rest and does not actuate the wheel 2, and a maximum drive position in which the driven by the pawl 6 is maximum .

Conformément à la présente invention, le cliquet 6 est monté fou, ou libre en rotation, sans frottement, sur ladite bascule d'actionnement 4 en un second point de pivotement B. Le cliquet 6 comprend un bec 8 agencé pour entrainer la dent à mener 3 ainsi qu'un guide 10 dont le rôle sera détaillé ci-après. Le guide 10 peut être par exemple une goupille fixée sur le cliquet 6. Le cliquet 6 présente très grossièrement une forme triangulaire, dont le premier sommet est constitué par le bec 8, le deuxième sommet étant occupé par le point de pivotement B, et le guide 10 étant fixé sur le troisième sommet.In accordance with the present invention, the pawl 6 is mounted loose, or free in rotation, without friction, on said actuating rocker 4 at a second pivot point B. The pawl 6 comprises a beak 8 arranged to cause the tooth to be driven 3 as well as a guide 10 whose role will be detailed below. The guide 10 may for example be a pin fixed to the pawl 6. The pawl 6 very roughly has a triangular shape, the first vertex of which is constituted by the beak 8, the second vertex being occupied by the pivot point B, and the guide 10 being fixed on the third vertex.

Le dispositif d'actionnement 1 comprend également des moyens de guidage agencés pour coopérer avec le guide 10 du cliquet 6 lorsque la bascule d'actionnement 4 évolue entre sa position initiale et sa position maximale d'entrainement.The actuating device 1 also comprises guide means arranged to cooperate with the guide 10 of the pawl 6 when the rocker actuation 4 moves between its initial position and its maximum drive position.

Conformément à l'invention, lesdits moyens de guidage sont configurés pour positionner le cliquet 6 dans une position d'évitement d'une dent avant 12 qui précède d'un pas la dent à mener 3, position d'évitement selon laquelle le bec 8 est éloigné de ladite dent avant 12 de sorte que la distance d1 du sommet du bec 8 du cliquet 6 au premier point de pivotement A de la bascule 4 est strictement inférieure, est de préférence très inférieure, à la distance d2 du sommet de ladite dent avant 12 au premier point de pivotement A, au moins quand le bec 8 du cliquet 6 dépasse le sommet de la dent avant 12. La différence entre la distance d2 du sommet de ladite dent avant 12 au premier point de pivotement A et la distance d1 du sommet du bec 8 du cliquet 6 au premier point de pivotement A est appelée la sécurité d'évitement SE.According to the invention, said guide means are configured to position the pawl 6 in a position of avoidance of a front tooth 12 which precedes by one step the tooth to be driven 3, avoidance position in which the beak 8 is remote from said front tooth 12 so that the distance d1 from the top of the beak 8 of the pawl 6 to the first pivot point A of the rocker 4 is strictly less, is preferably much less, than the distance d2 from the top of the said tooth front 12 to the first pivot point A, at least when the beak 8 of the pawl 6 passes the top of the front tooth 12. The difference between the distance d2 from the top of the said front tooth 12 to the first pivot point A and the distance d1 from the top of the beak 8 of the pawl 6 to the first pivot point A is called the avoidance safety SE.

D'une manière avantageuse, lesdits moyens de guidage sont configurés de sorte que, lorsque le bec 8 du cliquet 6 dépasse le sommet de la dent avant 12, le cliquet 6 étant en position d'évitement, la sécurité d'évitement SE de la dent avant 12 est supérieure à la différence entre la distance d2 du somment de la dent avant 12 au premier point de pivotement A et la distance d3 du sommet de la dent à mener 3 au premier point de pivotement A.Advantageously, said guide means are configured so that, when the beak 8 of the pawl 6 passes the top of the front tooth 12, the pawl 6 being in the avoidance position, the avoidance safety SE of the front tooth 12 is greater than the difference between the distance d2 from the top of the front tooth 12 to the first pivot point A and the distance d3 from the top of the leading tooth 3 to the first pivot point A.

De préférence, lorsque le mécanisme horloger est mis en œuvre dans une montre-bracelet, les moyens de guidage sont configurés de sorte que, lorsque le bec 8 dépasse le sommet de la dent avant 12, le cliquet 6 étant en position d'évitement, la sécurité d'évitement SE de la dent avant 12 est supérieure à 0,2 mm, de préférence 0,3 mm. L'homme du métier sait adapter ces valeurs en fonction des dimensions de la pièce d'horlogerie dans laquelle le dispositif d'actionnement de l'invention est utilisé. Notamment, en pendulerie, la valeur de la sécurité d'évitement SE sera revue à la hausse.Preferably, when the horological mechanism is implemented in a wristwatch, the guide means are configured so that, when the beak 8 passes the top of the front tooth 12, the pawl 6 being in the avoidance position, the avoidance security SE of the front tooth 12 is greater than 0.2 mm, preferably 0.3 mm. A person skilled in the art knows how to adapt these values according to the dimensions of the timepiece in which the actuation device of the invention is used. In particular, in clocks, the value of the SE avoidance safety device will be revised upwards.

De plus, les moyens de guidage sont également configurés pour ensuite faire pivoter le cliquet 6 par rapport au second point de pivotement B en direction de la roue dentée 2 dans une position d'engagement entre la dent avant 12 et la dent à mener 3, selon laquelle la distance d1 du sommet du bec 8 du cliquet 6 au premier point de pivotement A de la bascule 4 a augmenté par rapport à la distance d1 de la position d'évitement, afin de positionner le bec 8 du cliquet 6 entre la dent avant 12 et la dent à mener 3, en vue de la prise de la dent à mener 3 par le bec 8 du cliquet 6 pour son entrainement, comme le montre la figure 2.In addition, the guide means are also configured to then cause the pawl 6 to pivot with respect to the second pivot point B in the direction of the toothed wheel 2 in a position of engagement between the front tooth 12 and the tooth to be driven 3, according to which the distance d1 from the top of the beak 8 of the pawl 6 to the first pivot point A of the rocker 4 has increased with respect to the distance d1 from the avoidance position, in order to position the beak 8 of the pawl 6 between the front tooth 12 and the tooth to be driven 3, with a view to the taking of the tooth to be driven 3 by the beak 8 of the pawl 6 for its training, as shown in figure 2 .

D'une manière avantageuse, la distance d1 augmente pour que le bec 8 du cliquet soit suffisamment engagé entre la dent avant 12 et la dent à mener 3 assez tôt afin d'avoir une sécurité de prise de la dent à mener 3 suffisante pour permettre une bonne prise avec la dent à mener 3. La sécurité de prise SP de la dent à mener 3 est définie comme étant la différence entre la distance d1 du sommet du bec 8 du cliquet 6 au premier point de pivotement A et la distance d3 du sommet de la dent à mener 3 au premier point de pivotement A.Advantageously, the distance d1 increases so that the beak 8 of the pawl is sufficiently engaged between the front tooth 12 and the tooth to be driven 3 early enough in order to have a security grip of the tooth to be driven 3 sufficient to allow a good grip with the tooth to be driven 3. The safety of grip SP of the tooth to be driven 3 is defined as being the difference between the distance d1 from the top of the beak 8 of the pawl 6 to the first pivot point A and the distance d3 from the apex of leading tooth 3 at first pivot point A.

De préférence, les moyens de guidage sont configurés de sorte que, lorsque le cliquet 6 est en position d'engagement, la sécurité de prise SP avec la dent à mener 3 est supérieure ou égale à la différence entre la distance d2 du somment de la dent avant 12 au premier point de pivotement A et la distance d3 du sommet de la dent à mener 3 au premier point de pivotement A. L'homme du métier sait déterminer la valeur de la sécurité de prise SP en fonction des dimensions de la pièce d'horlogerie dans laquelle le dispositif d'actionnement de l'invention est utilisé. Notamment, en pendulerie, la valeur de la sécurité de prise SP sera supérieure à celle choisie pour une montre-bracelet par exemple.Preferably, the guide means are configured so that, when the pawl 6 is in the engagement position, the safety grip SP with the tooth to be driven 3 is greater than or equal to the difference between the distance d2 from the top of the front tooth 12 at the first pivot point A and the distance d3 from the top of the tooth to lead 3 to the first pivot point A. Those skilled in the art know how to determine the value of the grip security SP according to the dimensions of the part watchmaking in which the actuating device of the invention is used. In particular, in clocks, the value of the safety grip SP will be higher than that chosen for a wristwatch for example.

D'une manière particulièrement avantageuse, les moyens de guidage sont positionnés par rapport à la roue dentée 2 de sorte que la dent à mener 3 est la dent la plus proche de la ligne des centres 14, qui relie le centre C de la roue dentée 2 et le premier point de pivotement A de la bascule 4.In a particularly advantageous manner, the guide means are positioned with respect to the toothed wheel 2 so that the tooth to be driven 3 is the tooth closest to the line of centers 14, which connects the center C of the toothed wheel 2 and the first pivot point A of rocker 4.

Dans le mode de réalisation représenté, les moyens de guidage comprennent des premiers moyens de guidage constitués par une ouverture 16 prévue sur un élément de bâti du mécanisme horloger et des seconds moyens de guidage constitués par un élément orienteur 18 monté mobile sur un élément de bâti du mécanisme horloger.In the embodiment shown, the guide means comprise first guide means constituted by an opening 16 provided on a frame element of the timepiece mechanism and second guide constituted by an orienting element 18 movably mounted on a frame element of the watch mechanism.

L'ouverture 16 peut être réalisée dans la platine ou toute autre plaque du bâti.The opening 16 can be made in the plate or any other plate of the frame.

D'une manière avantageuse, l'ouverture 16 comprend une première portion 16a de forme sensiblement oblongue, et présentant un bord inférieur 20 agencé pour coopérer avec le guide 10 du cliquet 6 depuis la position initiale de la bascule 4. Le bord 20 présente une longueur et une forme permettant au cliquet 6 d'être en position d'évitement au moins quand son bec 8 dépasse le sommet de la dent avant 12. Notamment, la pente du bord 20 peut être descendante en direction de la roue dentée 2 (comme représenté) ou montante, l'essentiel étant que le point S1 du bord 20 de la première portion 16a sur lequel repose le guide 10 lorsque le bec 8 passe au-dessus du sommet de la dent avant 12 est positionné à une distance d4 du premier point de pivotement A choisie de sorte que le bec 8 du cliquet 6 est suffisamment soulevé et éloigné du somment de la dent avant 12 afin de respecter la sécurité d'évitement SE telle que définie ci-dessus et d'éviter confortablement la dent avant 12.Advantageously, the opening 16 comprises a first portion 16a of substantially oblong shape, and having a lower edge 20 arranged to cooperate with the guide 10 of the pawl 6 from the initial position of the rocker 4. The edge 20 has a length and a shape allowing the pawl 6 to be in the avoidance position at least when its beak 8 exceeds the top of the front tooth 12. In particular, the slope of the edge 20 can be downward in the direction of the toothed wheel 2 (as shown) or rising, the main thing being that the point S1 of the edge 20 of the first portion 16a on which the guide 10 rests when the beak 8 passes above the top of the front tooth 12 is positioned at a distance d4 from the first pivot point A chosen so that the beak 8 of the pawl 6 is sufficiently raised and far enough from the top of the front tooth 12 in order to respect the avoidance safety SE as defined above and to comfortably avoid the front tooth 12 .

L'ouverture 16 comporte également une seconde portion 16b communiquant avec la première portion 16a et dans laquelle le guide 10 du cliquet 6 peut circuler lorsque ledit cliquet 6 est amené dans sa position d'engagement, mais également lorsqu'il est déplacé pour entrainer la dent à mener 3 ainsi que pour passer dans sa position de décliquetage et revenir en position initiale, comme cela sera décrit ci-après.The opening 16 also comprises a second portion 16b communicating with the first portion 16a and in which the guide 10 of the pawl 6 can circulate when said pawl 6 is brought into its engagement position, but also when it is moved to cause the tooth to drive 3 as well as to move into its release position and return to the initial position, as will be described below.

Plus particulièrement, la deuxième portion 16b est suffisamment évasée en direction de la roue dentée 2 pour permettre au guide 10 de se déplacer dans ladite deuxième portion lorsque le cliquet 6 pivote par rapport à son point de pivotement B en direction de la roue à mener 2 pour se positionner dans sa position d'engagement. Puis la deuxième portion 16b forme une zone de dégagement dans laquelle le guide 10 peut se déplacer jusqu'à ce que la bascule 4 atteigne sa position maximale d'entrainement comme le montre la figure 3. La deuxième portion 16b est également dimensionnée pour permettre au guide 10 de s'y déplacer lorsque le cliquet 6 est amené dans sa position de décliquetage et que la bascule revient en position initiale, comme cela sera décrit ci-après.More particularly, the second portion 16b is sufficiently flared in the direction of the toothed wheel 2 to allow the guide 10 to move in said second portion when the pawl 6 pivots with respect to its pivot point B in the direction of the wheel to be driven 2 to position itself in its engagement position. Then the second portion 16b forms a clearance zone in which the guide 10 can move until the rocker 4 reaches its maximum driving position as shown in picture 3 . The second portion 16b is also dimensioned to allow the guide 10 to move there when the pawl 6 is brought into its disengaged position and the latch returns to its initial position, as will be described below.

D'une manière particulièrement préférée et avantageuse, l'élément orienteur 18 comprend un ressort. Par exemple, l'élément orienteur peut être un ressort, du type sautoir, ou une pièce pivotante présentant la forme appropriée décrite ci-dessous, et rappelée par un ressort.In a particularly preferred and advantageous manner, the orienting element 18 comprises a spring. For example, the orienting element can be a spring, of the jumper type, or a pivoting part having the appropriate shape described below, and returned by a spring.

L'élément orienteur 18 ou le ressort comprend un premier plan incliné 22a et un second plan incliné 22b joints par leur sommet S2. Le premier plan incliné 22a est agencé pour coopérer avec le guide 10 du cliquet 6 après que le bec 8 a dépassé le sommet de la dent avant 12 afin de faire pivoter le cliquet 6 par rapport au second point de pivotement B et l'amener dans sa position d'engagement comme le montre la figure 2.The orienting element 18 or the spring comprises a first inclined plane 22a and a second inclined plane 22b joined by their apex S2. The first inclined plane 22a is arranged to cooperate with the guide 10 of the pawl 6 after the beak 8 has passed the top of the front tooth 12 in order to cause the pawl 6 to pivot with respect to the second pivot point B and bring it into its engagement position as shown in the figure 2 .

Plus particulièrement, la pente du premier plan incliné 22a est descendante en direction de la roue dentée 2, son angle d'inclinaison et sa longueur étant choisis de sorte que le sommet S2 de l'élément orienteur ou ressort 18 contre lequel le guide 10 s'appuie lorsque le cliquet 6 atteint sa position d'engagement est positionné à une distance d5 du premier point de pivotement A telle que le cliquet 6 a suffisamment pivoté en direction de la roue dentée 2 pour que son bec 8 soit suffisamment engagé entre la dent avant 12 et la dent à mener 3 et assez tôt et qu'il se trouve à la distance d1 permettant de respecter la sécurité de prise de la dent à mener 3 telle que définie ci-dessus de manière à garantir une bonne prise avec la dent à mener 3 largement avant ladite dent à mener 3.More particularly, the slope of the first inclined plane 22a is downward in the direction of the toothed wheel 2, its angle of inclination and its length being chosen so that the top S2 of the orienting element or spring 18 against which the guide 10 s presses when the pawl 6 reaches its engagement position is positioned at a distance d5 from the first pivot point A such that the pawl 6 has pivoted sufficiently in the direction of the toothed wheel 2 so that its beak 8 is sufficiently engaged between the tooth before 12 and the tine to drive 3 and early enough and that it is at the distance d1 allowing to respect the safety grip of the tine to drive 3 as defined above so as to guarantee a good grip with the tine to lead 3 well before said tooth to lead 3.

Le second plan incliné 22b de l'élément orienteur ou ressort 18 est agencé pour coopérer avec le guide 10 du cliquet 6 lorsque la bascule d'actionnement 4 revient dans sa position initiale afin de déplacer ledit élément orienteur ou ressort 18 mobile pour permettre d'amener le cliquet 6 dans une position de décliquetage comme le montre la figure 4. Le second plan incliné 22b est configuré de sorte que le guide 10 vient à son contact lorsque le cliquet 6, repoussé par la dent avant 12 quand la bascule 4 revient en position initiale, pivote par rapport à son point de pivotement B en s'écartant de la roue 2. Le guide 10 soulève l'élément orienteur 18 pour l'écarter et permettre le retour de la bascule 4 et du cliquet 6 en position initiale. L'élément orienteur ou ressort 18 reprend ensuite sa position normale. D'une manière avantageuse, l'orientation des plans inclinés 22a et 22b de l'élément orienteur ou ressort 18 est définie de sorte que l'engagement ou le décliquetage du cliquet 6 sous l'effet du guide 10 peut se faire sans effort inutile.The second inclined plane 22b of the orienting element or spring 18 is arranged to cooperate with the guide 10 of the pawl 6 when the actuating rocker 4 returns to its initial position in order to move the said orienting element or spring 18 movable to allow bring the pawl 6 into an unlatching position as shown in the figure 4 . The second inclined plane 22b is configured so that the guide 10 comes into contact with it when the pawl 6, pushed back by the front tooth 12 when rocker 4 returns to its initial position, pivots with respect to its pivot point B away from wheel 2. Guide 10 raises orienting element 18 to separate it and allow rocker 4 and pawl 6 in initial position. The directing element or spring 18 then returns to its normal position. Advantageously, the orientation of the inclined planes 22a and 22b of the orienting element or spring 18 is defined so that the engagement or disengagement of the pawl 6 under the effect of the guide 10 can be done without unnecessary effort. .

Le fonctionnement du dispositif d'actionnement de l'invention est le suivant : lorsque la roue 2 doit être actionnée d'un pas, la bascule 4 est commandée pour quitter sa position initiale et pivoter dans le sens antihoraire autour de son point de pivotement A pour déplacer le cliquet 6 en direction de la roue 2. Lorsque le cliquet 6 se déplace, son guide 10 s'appuie sur le bord 20 de la première portion 16a de l'ouverture 16 de sorte que le bec 8 du cliquet 6, libre de pivoter autour de son point de pivotement B, suit le mouvement imposé par le bord 20 de l'ouverture 16. Lorsque le guide 10 arrive au point S1 du bord 20, le cliquet 6 est positionné dans sa position d'évitement par rapport à la dent avant 12 choisie pour éviter confortablement la dent avant 12 et respecter la sécurité d'évitement SE de la dent avant 12 telle que définie ci-dessus, comme représenté sur la figure 1.The operation of the actuating device of the invention is as follows: when the wheel 2 must be actuated by one step, the rocker 4 is controlled to leave its initial position and pivot counterclockwise around its pivot point A to move the pawl 6 in the direction of the wheel 2. When the pawl 6 moves, its guide 10 rests on the edge 20 of the first portion 16a of the opening 16 so that the beak 8 of the pawl 6, free to pivot around its pivot point B, follows the movement imposed by the edge 20 of the opening 16. When the guide 10 arrives at the point S1 of the edge 20, the pawl 6 is positioned in its avoidance position with respect to the front tooth 12 chosen to comfortably avoid the front tooth 12 and respect the safety avoidance SE of the front tooth 12 as defined above, as represented on the figure 1 .

La bascule 4 continuant de pivoter dans le sens antihoraire, le guide 10 se déplace également dans l'ouverture 16 et vient en butée contre le premier plan incliné 22a de l'élément orienteur 18 de sorte que le cliquet 6 pivote autour de son point de pivotement B dans le sens horaire pour être amené dans sa position d'engagement suffisamment avant la dent à mener 3 en respectant la sécurité de prise SP avec la dent à mener 3 telle que définie ci-dessus, comme représenté sur la figure 2.Rocker 4 continuing to pivot counterclockwise, guide 10 also moves in opening 16 and comes into abutment against first inclined plane 22a of orienting element 18 so that pawl 6 pivots around its point of pivoting B in the clockwise direction to be brought into its engagement position sufficiently before the tine to be driven 3 while respecting the grip safety SP with the tine to be driven 3 as defined above, as represented on the figure 2 .

La bascule 4 continuant de pivoter dans le sens antihoraire, le bec 8 du cliquet est en prise avec la dent à mener 3 et l'entraine pour la déplacer d'un pas, le guide 10 se déplaçant dans la deuxième portion 16b de l'ouverture 16, jusqu'à ce que la bascule 4 atteigne sa position maximale d'entrainement, comme représenté sur la figure 3.The rocker 4 continuing to pivot in the counterclockwise direction, the beak 8 of the pawl is in engagement with the tooth to be driven 3 and causes it to move it by one step, the guide 10 moving in the second portion 16b of the opening 16, until rocker 4 reaches its maximum drive position, as shown in figure picture 3 .

Puis la bascule 4 revient dans sa position initiale en pivotant autour de son point de pivotement A dans le sens horaire. Le cliquet 6 en butant contre la dent avant 12 pivote autour de son point de pivotement B dans le sens antihoraire de sorte que son guide 10 bute contre le second plan incliné 22b de l'élément orienteur 18 pour le soulever et l'écarter afin de permettre le déplacement du cliquet 6 dans sa position de décliquetage comme représenté sur la figure 4.Then rocker 4 returns to its initial position by pivoting around its pivot point A clockwise. The pawl 6, abutting against the front tooth 12 pivots around its pivot point B in the counterclockwise direction so that its guide 10 abuts against the second inclined plane 22b of the orienting element 18 to lift it and move it aside in order to allow the pawl 6 to move into its unlatched position as shown in the figure 4 .

Enfin, la bascule 4 et le cliquet 6 reprennent leurs positions initiales respectives, le guide 10 circulant dans l'ouverture 16 pour revenir dans la première portion 16a de ladite ouverture 16.Finally, rocker 4 and pawl 6 return to their respective initial positions, guide 10 circulating in opening 16 to return to first portion 16a of said opening 16.

Le dispositif d'actionnement selon l'invention permet de positionner le bec 8 du cliquet 6 de manière très précise entre la dent avant 12 et la dent à mener 3 pour assurer une bonne pénétration avec la dent à mener 3, tout en ayant évité la dent avant 12 avec une grande sécurité d'évitement, et cela même si la roue dentée à actionner présente un nombre important de dents, le partagement entre la sécurité de prise avec la dent à mener et la sécurité d'évitement de la dent avant étant alors serré.The actuation device according to the invention makes it possible to position the beak 8 of the pawl 6 very precisely between the front tooth 12 and the tooth to be driven 3 to ensure good penetration with the tooth to be driven 3, while having avoided the front tooth 12 with a high avoidance safety, and this even if the toothed wheel to be actuated has a large number of teeth, the division between the safety of engagement with the tooth to be driven and the avoidance safety of the front tooth being then tight.

En conséquence, il devient possible avec le dispositif d'actionnement selon l'invention de travailler avec la dent située la plus proche de la ligne des centres afin d'obtenir une transmission de couple optimale tout en garantissant une bonne prise avec la dent à mener, ainsi qu'une bonne sécurité d'évitement de la dent avant, et cela même avec des roues ayant un grand nombre de dents. La roue dentée 2 peut comprendre au moins 20 dents, de préférence au moins 24 dents. La roue dentée 2 peut être par exemple une étoile de quantième de 31 dents d'un mécanisme de quantième, et plus particulièrement un mécanisme de quantième perpétuel, actionnée par la grande bascule. La roue dentée peut également être toute autre roue dentée ou étoile présentant un grand nombre de dents et actionnée par une bascule ou un levier dans un mécanisme horloger. Le dispositif d'actionnement selon l'invention est particulièrement approprié lorsque le mécanisme horloger impose d'utiliser une bascule ou un levier d'une grande longueur qui, sans le dispositif de l'invention, aurait pour conséquence de péjorer les sécurités d'évitement et de prise.Consequently, it becomes possible with the actuation device according to the invention to work with the tooth located closest to the center line in order to obtain optimum torque transmission while guaranteeing a good grip with the tooth to be driven. , as well as a good safety avoidance of the front tooth, and this even with wheels having a large number of teeth. The toothed wheel 2 can comprise at least 20 teeth, preferably at least 24 teeth. The toothed wheel 2 may for example be a 31-tooth date star of a date mechanism, and more particularly a perpetual calendar mechanism, actuated by the large rocker. The toothed wheel can also be any other toothed wheel or star having a large number of teeth and actuated by a rocker or a lever in a watch mechanism. The actuation device according to the invention is particularly suitable when the watch mechanism requires the use of a rocker or a very long lever which, without the device of the invention, would have the effect of impairing the avoidance and grip securities.

De plus, le cliquet 6 étant monté fou sur la bascule 4, est facile à faire pivoter pour s'engager dans la denture ou s'en dégager avec précision, de sorte que tout glissement rentrant ou sortant entre le cliquet 6 et la roue 2 est supprimé.In addition, the pawl 6 being loosely mounted on the rocker 4, is easy to pivot to engage in the teeth or disengage from them with precision, so that any slipping in or out between the pawl 6 and the wheel 2 is deleted.

Enfin, l'élément orienteur 18 sous la forme d'un ressort, permet de supprimer avantageusement le ressort de cliquet de grande bascule embarqué utilisé habituellement dans un mécanisme standard de quantième perpétuel. En effet, un tel ressort de force très faible est compliqué à réaliser dans un mécanisme standard de quantième perpétuel dans lequel le grand cliquet agissant sur l'étoile de 31 est solidaire de la grande bascule.Finally, the orienting element 18 in the form of a spring advantageously makes it possible to eliminate the on-board large rocker pawl spring usually used in a standard perpetual calendar mechanism. Indeed, such a spring of very low force is complicated to produce in a standard perpetual calendar mechanism in which the large pawl acting on the star of 31 is integral with the large rocker.

Claims (10)

  1. Device (1) for actuating a toothed wheel (2) of a timepiece mechanism by driving a tooth to be driven (3) of said toothed wheel (2), said actuating device comprising an actuating lever arm (4) arranged to pivot at a first pivot point (A) between an initial position and a maximum position for driving said tooth to be driven (3), a pawl (6) mounted in a freely rotatable manner on said actuating lever arm (4) at a second pivot point (B), said pawl (6) comprising a beak (8) arranged to drive said tooth to be driven (3) and a guide (10), as well as guide means arranged to cooperate with said guide (10) when the actuating lever arm (4) moves between its initial position and its maximum driving position, said guide means being configured in order to position the pawl (6) in a position for avoidance of a forward tooth (12) which precedes the tooth to be driven (3), according to which the distance from the beak (8) of the pawl (6) to the first pivot point (A) is strictly less than the distance from the tip of said forward tooth (12) to the first pivot point (A), at least when the beak (8) of the pawl (6) passes the tip of the forward tooth (12), and in order then to cause the pawl (6) to pivot with respect to the second pivot point (B) in the direction of the toothed wheel (2) into an engagement position between the forward tooth (12) and the tooth to be driven (3), according to which the distance from the beak (8) of the pawl (6) to the first pivot point (A) has increased with respect to the avoidance position, in view of the engagement of the tooth to be driven (3) by the beak (8) of the pawl (6) for driving thereof, the actuating device being characterised in that the guide means are positioned with respect to the toothed wheel (2) so that the tooth to be driven (3) is the tooth closest to the centre line (14) which connects the centre (C) of the toothed wheel (2) and said first pivot point (A) of the lever arm (4).
  2. Actuating device as claimed in claim 1, characterised in that the guide means comprise first guide means formed by an opening (16) provided on a frame element of the timepiece mechanism and second guide means formed by an orientating element (18) movably mounted on a frame element of the timepiece mechanism.
  3. Actuating device as claimed in the preceding claim, characterised in that the opening (16) comprises a first portion (16a) arranged to cooperate with the guide (10) of the pawl (6) and of a length permitting the pawl (6) to be in the avoidance position at least when its beak (8) passes the tip of the forward tooth (12), and a second portion (16b) communicating with said first portion (16a) and in which the guide (10) travels when the pawl (6) is brought into its engagement position.
  4. Actuating device as claimed in one of claims 2 and 3, characterised in that the orientating element (18) comprises a first inclined plane (22a) arranged to cooperate with the guide (10) of the pawl (6) after its beak (8) has passed the tip of the forward tooth (12) in order to cause the pawl (6) to pivot with respect to the second pivot point (B) and to bring it into its engagement position.
  5. Actuating device as claimed in claim 4, characterised in that the orientating element (18) comprises a second inclined plane (22b) arranged to cooperate with the guide (10) of the pawl (6) when the actuating lever arm (4) returns to its initial position in order to displace the orientating element (18) to permit the pawl (6) to be brought into an unlatching position.
  6. Actuating device as claimed in any one of claims 2 to 5, characterised in that the orientating element (18) comprises a spring.
  7. Actuating device as claimed in any one of the preceding claims, characterised in that the guide means are configured so that, when the beak (8) of the pawl (6) passes the tip of the forward tooth (12), said pawl (6) being in the avoidance position, the margin for avoidance (SE) of the forward tooth (12) is greater than the difference between the distance from the tip of the forward tooth (12) to the first pivot point (A) and the distance from the tip of the tooth to be driven (3) to the first pivot point (A).
  8. Actuating device as claimed in any one of the preceding claims, characterised in that the guide means are configured so that, when the pawl (6) is in the engagement position, the margin for engagement (SP) with the tooth to be driven (3) is greater than or equal to the difference between the distance from the tip of the forward tooth (12) to the first pivot point (A) and the distance from the tip of the tooth to be driven (3) to the first pivot point (A).
  9. Actuating device as claimed in any one of the preceding claims, characterised in that the toothed wheel (2) comprises at least 20 teeth, preferably at least 24 teeth.
  10. Timepiece comprising an actuating device as claimed in any one of claims 1 to 9.
EP19172297.4A 2019-05-02 2019-05-02 Device for actuating a toothed wheel of a clock mechanism Active EP3734372B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19172297.4A EP3734372B1 (en) 2019-05-02 2019-05-02 Device for actuating a toothed wheel of a clock mechanism

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19172297.4A EP3734372B1 (en) 2019-05-02 2019-05-02 Device for actuating a toothed wheel of a clock mechanism

Publications (2)

Publication Number Publication Date
EP3734372A1 EP3734372A1 (en) 2020-11-04
EP3734372B1 true EP3734372B1 (en) 2022-10-12

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EP19172297.4A Active EP3734372B1 (en) 2019-05-02 2019-05-02 Device for actuating a toothed wheel of a clock mechanism

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EP (1) EP3734372B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4246247A1 (en) * 2022-03-14 2023-09-20 Patek Philippe SA Genève Driving mechanism for a timepiece

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH54709A (en) * 1911-02-13 1912-06-17 Robert Cart Device for actuating a toothed wheel by a swivel lever
CH703823B1 (en) * 2010-09-23 2014-12-15 Patek Philippe Sa Geneve Ratchet rocker, drive stepper having such rocker and a timepiece including such a mechanism.
EP2503411B1 (en) * 2011-03-22 2014-12-03 Montres Breguet SA Ewiger Kalender mit Einzelsperre

Also Published As

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EP3734372A1 (en) 2020-11-04

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