EP0079301B1 - Drive device for intermittently rotating a component part - Google Patents

Drive device for intermittently rotating a component part Download PDF

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Publication number
EP0079301B1
EP0079301B1 EP82810435A EP82810435A EP0079301B1 EP 0079301 B1 EP0079301 B1 EP 0079301B1 EP 82810435 A EP82810435 A EP 82810435A EP 82810435 A EP82810435 A EP 82810435A EP 0079301 B1 EP0079301 B1 EP 0079301B1
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EP
European Patent Office
Prior art keywords
pinion
teeth
rotation
driving
transmission assembly
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.)
Expired
Application number
EP82810435A
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German (de)
French (fr)
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EP0079301A1 (en
Inventor
Ernst Ammann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ETA SA Manufacture Horlogere Suisse
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Eta SA Fabriques dEbauches
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Publication of EP0079301A1 publication Critical patent/EP0079301A1/en
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • 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
    • 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 an intermittent drive device for a rotating part.
  • the invention relates to a mechanism for driving the date indicator for watches with analog display and, preferably, for electronic watches.
  • This device comprises a driving mobile, a transmission assembly and first and second immobilization means.
  • the driving mobile is pivotally mounted about an axis and comprises on a portion of its periphery, at least one drive means comprising a toothed sector.
  • the transmission assembly is mounted pivoting about an axis and comprises first and second pinions each provided with peripheral toothing to mesh with the toothed sector, respectively a toothing carried by the part to be driven.
  • the first and second immobilization means cooperate with each other so as to allow the first pinion to rotate only when it is engaged with the toothed sector, said immobilization means allowing the driving mobile to rotate freely.
  • the date is displayed conventionally by a disc or a crown which carries on one of its faces the numbers from 1 to 31, these numbers parading successively in front of a window arranged in the dial of the watch.
  • This indicator is rotated by the gear train, so that it advances one step every 24 hours.
  • the locking in each of the display positions of the date indicator is usually carried out by an elastic locking member engaging successively between the different teeth of a toothing formed on the disc or the crown as and when advance of the indicator.
  • the motive force which must be applied to it is thus clearly greater than the motive force only necessary to drive the hands of the watch, since it is necessary in addition to supply the energy to erase the elastic locking member.
  • CH-A-538.136 describes one such mechanism which makes it possible to reduce the torque to be applied to drive the date indicator.
  • the elastic locking device of the date indicator is effectively removed in its different positions, which decreases the torque applied.
  • this mechanism has other drawbacks.
  • Such a device comprises a drive disc, an intermediate plate provided with pins which cooperate with the disc and a date display disc which is provided on its internal periphery with deep notches.
  • the intermediate plate is provided with two pins which can penetrate into the notches of the date disc and which can also cooperate with a projection and two notches formed on the periphery of the drive disc.
  • the disc thus drives the date disc by one step at each of its rotations by means of the plate provided with its two pins.
  • English patent application GB-A-2,026,213 describes a date mechanism comprising a driving mobile driven by the train of the watch and provided at its periphery with a toothed sector and a transmission assembly comprising a first toothing to mesh with the toothed sector and a second toothing to drive the date disc, as well as a jumper cooperating on the one hand with the second toothing of the transmission assembly and with a cam carried by the driving mobile.
  • the jumper pivotally mounted on the watch plate has two arms, one of which bears against the cam and the other, elastic, in the second toothing.
  • the cam is arranged so that, when the toothed sector is not in engagement with the first teeth, the elastic arm is armed and ensures the positioning of the transmission mobile while when the toothed sector meshes with the first teeth, the elastic arm is disarmed and allows the transmission mobile to rotate freely.
  • the presence of the jumper allows the date disc to be driven, by a correction mechanism, at least when the toothed sector does not mesh with the teeth of the transmission mobile.
  • This solution has two drawbacks. First of all, the jumper almost constantly rubs against the cam, resulting in a loss of energy. In addition, when the toothed sector is engaged, the drive of the date disc by the correction mechanism may damage one or the other part of the date mechanism.
  • the present invention specifically relates to an intermittent drive device for a workpiece, and more particularly a date disc which has a low torque but which does not have the drawbacks of the prior art described, that is to say that is to say which effectively ensures a good locking of the date disc in each position, which prevents shocks and friction when the disc is moving and which allows correction of the disc at all times.
  • the transmission assembly also includes retractable connecting means for securing in rotation the two pinions, as long as the holding torque does not exceed a limit value.
  • the date disc can be freely corrected, whatever the relative positions of the driving mobile and the transmission mobile, while guaranteeing correct positioning of the date device, this position being defined by the connecting means, such as a long necklace integral with one of the pinions and cooperating with the teeth of the other.
  • the drive means of the driving mobile comprise two gear teeth which mesh with the teeth of the transmission mobile.
  • the second immobilization means comprise n pins (preferably 4) integral in rotation with the transmission mobile. These pins are arranged on the same circle centered on the axis of rotation of the return mobile and they are angularly offset by 360 ° / n.
  • the first immobilization means comprise a circular rim which is integral in rotation with the driving mobile and disposed at the same level as the pins.
  • This rim is provided with two notches arranged in such a way that, during the training phase of the date indicator, one of the lugs can cross the rim and that, on the contrary, outside of the training phases of the date indicator, two or both pins are in abutment on the rim to thus ensure the locking of the transmission mobile and consequently the locking of the date indicator by means of the engagement of the transmission mobile with the teeth of the date disc.
  • the pins do not play any driving role during the rotation of the transmission mobile. Consequently, the dimensions of the notches on the flange are not critical and it is possible to give them a sufficient width so that there is no problem of introduction of the pins in these notches.
  • the watch conventionally comprises a carriageway 2 and a barrel wheel 4 which are mounted on an axis 6 integral with the frame 8 of the watch.
  • a timer wheel 10 is driven by the carriageway 2 and it drives the barrel wheel 4.
  • the carriageway 2 is conventionally driven by a gear train driven by the motor and which acts on the minute wheel 2a integral with the floor 2. This gear train and the motor have not been shown, since they are of the conventional type and they do not relate to the invention.
  • the pinion 10a of the timer wheel 10 meshes with a wheel 12a of a date reference 12.
  • a pinion 12b forming part of the reference 12 meshes with a driving mobile bearing the general reference 14 and whose structure will be described later.
  • This driving mobile 14 cooperates with a transmission assembly bearing the general reference 16.
  • This assembly will also be described later.
  • the transmission assembly cooperates with a date indicator 18 or date crown.
  • the mobile 14 is pivotally mounted on a tenon 20 forming an integral part of the frame 8. This mobile is held on this axis by the head of a screw 22 engaged in the threaded bore 20a of the tenon.
  • the mobile 14 includes all first a toothed pinion 24 whose hub 24a extends beyond the toothing.
  • the mobile 14 has a second part constituted by a portion massive 26.
  • the portion 26 forms on the one hand a disc 26a near the frame 8, this disc comprising a toothed sector constituted for example by two teeth respectively referenced 26'a and 26 "a.
  • the part 26 defines, on the other part, a cylindrical portion 26b whose diameter is less than that of the disc 26a.
  • the portion 26b therefore comprises a side wall 26'b and a flat wall 26 "b parallel to the disc 26a.
  • the cylindrical portion 26b has a groove 30 having substantially the shape of a portion of circular crown which opens on the one hand into the flat face 26 "b and on the other hand into the lateral face 26'b by two notches 30 'and 30". He observes that the remaining portion 32 of the cylindrical part 26b delimited by the groove 30 has a thickness less than the thickness of the rest of this part.
  • the axis of symmetry of the groove 30 coincides with the axis of symmetry of the teeth 26'a and 26 "a.
  • the part 26 further comprises a central bore 26c in which the hub 24a of the pinion 24 is driven. a connection between these two parts which rotate together around the axis defined by the lug 20.
  • the transmission assembly 16 is pivotally mounted about an axis defined by a bush 40 driven on a tenon 42 forming an integral part of the frame 8.
  • the assembly 16 firstly comprises a pinion 44 mounted pivoting around the bush 40
  • the assembly 16 also comprises a plate 46 integral in rotation with the pinion 44 and which comprises 4 radiating arms 48a, 48b, 48c and 48d at the end of which are fixed pins or lugs 50a, 50b, 50c and 50d. These pins are arranged on the same circle centered on the axis XX 'of rotation of the assembly 16. The pins therefore rotate at the same time as the pinion 44.
  • the length L of the arms is such that two consecutive pins can come into contact from the lateral face 26'b of the driving mobile.
  • the groove 30 has a width and a depth sufficient to allow the free passage of the pins during the relative rotation of the two mobiles.
  • the ends 30 ′ and 30 ′′ of the groove 30 are arranged on the side wall 26 ′ b in such a way that, as will be explained later, the pins can effectively penetrate into the groove 30 when the teeth 26 ′ a and 26 "a drive the transmission assembly 16 in rotation.
  • the pinion 44 is arranged in such a way that it meshes with the teeth 26'a and 26" a of the moving part leading to certain positions thereof.
  • the transmission assembly comprises a second toothed pinion 52 which can pivot freely on the bush 40.
  • the connection between the pinion 44 and the pinion 52 is temporarily ensured by a jumper 54.
  • This jumper 54 is for example secured to the plate 46.
  • the pinions 52 and 44 are therefore integral in rotation.
  • the date crown 18 is provided on its internal periphery with teeth 18a which mesh with the teeth of the pinion 52 of the transmission assembly 16.
  • the driving mobile 14 comprises a drive means constituted by the teeth 26'a, 26 "a; and first immobilization means constituted by the groove 30 and the edge 26'b
  • the transmission assembly 16 comprises a transmission mobile constituted by the pinions 44 and 52 and second immobilization means constituted by the lugs 50 fixed at the end of the arms 48.
  • the part 26b could be replaced by a simple rim defining the side wall 26'b of the part 26b, this rim being pierced with two notches corresponding to the outlets 30 'and 30 "of the groove 30, formed in the part 26b.
  • the gear ratios between the timer wheel, the date return mobile 12 and the pinion 24 of the driving mobile are such that the driving mobile makes one revolution per 24 hour period.
  • the number of teeth on the pinion 44 of the transmission assembly is such that this pinion makes one revolution per period of 4 days. Consequently, for each 24-hour period, the crown 18 of the calendars effectively progresses by one step as it should be.
  • the transmission assembly 16 is immobilized in rotation but the driving mobile 14 can rotate freely under the effect of the drive of the date reference.
  • the jumper 52 fulfills its function and secures the plate 46 with the pinion 52.
  • the elastic end 54 of the jumper cooperates with the pinion 52.
  • the pinion 52 is therefore also immobilized in rotation and the crown 18 is also immobilized by the cooperation of the teeth of the pinion 52 with the teeth 18a of the date crown.
  • the pinion 52 is permanently engaged with the toothing 18a of the crown. It follows that, thanks to conventional toothed pinion cutting techniques, it is possible to have a very small clearance between the pinion 52 and the crown 18, which ensures an excellent positioning of the latter. Of course if an external torque is applied to the crown 18, for example by a calendar display correction device, the part 46 remains locked but the pinion 52 can be rotated by the crown thanks to the elastic connection provided by long necklace 54.
  • the driving mobile 14 makes one revolution per 24 hours. It would of course be possible to envisage a training mechanism in which the leading mobile would, for example, do a lap for px24 hours. In this case, of course, the mobile should have p toothed sectors corresponding to the toothing 26'a, 26 "a and p grooves corresponding to the groove 30. Furthermore, the transmission assembly would remain identical with its four lugs.
  • the invention effectively makes it possible to obtain a device for driving a part or more precisely a date crown with low torque. Indeed, on the one hand there is no longer any elastic positioning member acting directly on the date crown, on the other hand, the transmissions of movement between the various mobiles are effectively effected by gears which reduces the clearances and shocks and which improves the positioning of the date indicator during locking which eliminates the need for external organs.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Supply And Installment Of Electrical Components (AREA)
  • Vending Machines For Individual Products (AREA)
  • Steering Controls (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Gears, Cams (AREA)

Abstract

The driving mechanism of the day of the month disk (18) comprises a driving wheel (14) and a transmission wheel (16) The driving wheel (14) comprises a toothed sector (26'a, 26'a) which can mesh with the pinion (44) of the transmission wheel (16) and peripheral wall surface (26'a) into which open the two ends (30' and 30'') of an arcuate groove (30). The transmission wheel (16) also comprises a member constituted by four arms (48a to 48d) carrying four studs (50a and 50d) which can enter the groove (30) and a pinion (52) which meshes with the disk (18). Outside the driving phases, two of the studs abut against the peripheral wall surface (26'b) in order to lock the disk (18). This mechanism provides for a low torque which enables the energy to be applied to the motor of the watch to be reduced.

Description

La présente invention a pour objet un dispositif d'entraînement intermittent d'une pièce en rotation.The present invention relates to an intermittent drive device for a rotating part.

De façon plus précise mais non limitative, l'invention concerne un mécanisme d'entraînement d'indicateur de quantième pour montres à affichage analogique et, de préférence, pour montres électroniques.More specifically but not limited to, the invention relates to a mechanism for driving the date indicator for watches with analog display and, preferably, for electronic watches.

Ce dispositif comprend un mobile menant, un ensemble de transmission et des premiers et seconds moyens d'immobilisation.This device comprises a driving mobile, a transmission assembly and first and second immobilization means.

Le mobile menant est monté pivotant autour d'un axe et comporte sur une portion de sa périphérie, au moins un moyen d'entraînement comprenant un secteur denté.The driving mobile is pivotally mounted about an axis and comprises on a portion of its periphery, at least one drive means comprising a toothed sector.

L'ensemble de transmission est monté pivotant autour d'un axe et comporte des premier et deuxième pignons muni chacun d'une denture périphérique pour engrener avec le secteur denté, respectivement une denture portée par la pièce à entraîner.The transmission assembly is mounted pivoting about an axis and comprises first and second pinions each provided with peripheral toothing to mesh with the toothed sector, respectively a toothing carried by the part to be driven.

Les premiers et seconds moyens d'immobilisation coopèrent les uns avec les autres pour ne laisser tourner le premier pignon que lorsqu'il est en prise avec le secteur denté, lesdits moyens d'immobilisation laissant tourner librement le mobile menant.The first and second immobilization means cooperate with each other so as to allow the first pinion to rotate only when it is engaged with the toothed sector, said immobilization means allowing the driving mobile to rotate freely.

Il est bien connu que dans les montres analogiques, l'affichage du quantième se fait classiquement par un disque ou une-couronne qui porte sur une de ses faces les nombres de 1 à 31, ces nombres défilant successivement devant un guichet ménagé dans le cadran de la montre. Cet indicateur est entraîne en rotation par le train d'engrenages, de telle manière qu'il progresse d'un pas toutes les 24 heures. Le verrouillage dans chacune des positions d'affichage de l'indicateur de quantième est réalisé habituellement par un organe élastique de verrouillage s'engageant successivement entre les différentes dents d'une denture ménagée sur le disque ou la couronne au fur et à mesure de l'avance de l'indicateur. Lors de l'actionnement quotidien de cet indicateur, la force motrice qui doit lui être appliquée est ainsi nettement supérieure àt la force motrice seulement nécessaire pour entraîner les aiguilles de la montre, du fait qu'il faut fournir en plus l'énergie pour effacer l'organe élastique de verrouillage.It is well known that in analog watches, the date is displayed conventionally by a disc or a crown which carries on one of its faces the numbers from 1 to 31, these numbers parading successively in front of a window arranged in the dial of the watch. This indicator is rotated by the gear train, so that it advances one step every 24 hours. The locking in each of the display positions of the date indicator is usually carried out by an elastic locking member engaging successively between the different teeth of a toothing formed on the disc or the crown as and when advance of the indicator. During the daily actuation of this indicator, the motive force which must be applied to it is thus clearly greater than the motive force only necessary to drive the hands of the watch, since it is necessary in addition to supply the energy to erase the elastic locking member.

Cet excès d'énergie nécessaire qui n'est que très temporaire puisqu'il ne se produit qu'une fois par 24 heures, est particulièrement préjudicible dans le cas des montres électroniques. En effet, le moteur doit être alimenté pour pouvoir fournir effectivement le couple nécessaire pour l'entraînement de l'indicateur. Pour éviter d'avoir à fournir en permanence au moteur la quantité d'énergie nécessaire pour fournir ce couple, il est possible de prévoir un circuit d'asservissement du moteur qui adapte l'énergie fournie au moteur à la charge et donc en particulier au couple qui doit être appliqué à l'indicateur de quantième. Cependant, un tel circuit complique le circuit de commande de la montre.This excess energy required, which is only very temporary since it only occurs once in 24 hours, is particularly harmful in the case of electronic watches. Indeed, the motor must be powered to be able to effectively supply the torque necessary for driving the indicator. To avoid having to constantly supply the motor with the quantity of energy necessary to supply this torque, it is possible to provide a motor control circuit which adapts the energy supplied to the motor to the load and therefore in particular to the torque to be applied to the date indicator. However, such a circuit complicates the control circuit of the watch.

Une autre solution consiste bien sûr à tenter de diminuer le couple qu'il est nécessaire d'appliquer à l'indicateur de quantième pour le faire progresser d'une pas.Another solution is of course to try to reduce the torque which it is necessary to apply to the date indicator to make it progress by one step.

CH-A-538.136 un décrit un tel mécanisme qui permet de réduire le couple à appliquer pour entraîner l'indicateur de quantième. Selon ce mécanisme, on supprime effectivement le dispositif de verrouillage élastique de l'indicateur de quantième dans ses différentes positions, ce qui diminue le couple à appliqeur. Mais ce mécanisme présente d'autres inconvénients. Un tel dispositif comprend un disque d'entraînement, un plateau intermédiaire muni de goupilles qui coopèrent avec le disque et un disque d'affichage de quantième qui est muni sur sa périphérie interne d'encoches profondes. Le plateau intermédiaire est muni de deux goupilles qui peuvent pénétrer dans les encoches du disque de quantième et qui peuvent coopérer également avec une saillie et deux encoches ménagées sur la périphérie du disque d'entraînement. Le disque entraîne ainsi le disque de quantième d'un pas à chacune des ses rotations par l'intermédiaire du plateau muni de ses deux goupilles. Le verrouillage du disque est assuré par le présence de deux ergots supplémentaires montés sur le disque. En dehors des phases d'entraînement, un des ergots et une des goupilles sont en appui sur la face latérale du disque assurant ainsi l'immobilisation du disque tout en permettant une libre rotation du disque d'entraînement. Cette solution présente de graves inconvénients en raison de la coopération entre les goupilles et les fentes ménagées dans le disque de quantième et entre ces mêmes goupilles et la saillie ménagée sur la disque d'entraînement. Il est en effet nécessaire de prévoir des jeux importants pour que le dispositif puisse fonctionner et l'immobilisation du disque est donc médiocre. De plus, ces jeux entraînent des chocs supplémentaires qui consomment de l'énergie et provoquent des frottements. En outre, selon ce même document, pour assurer un verrouillage effectif de la couronne de quantième, il est prévu un aimant permanent qui maintient effectivement la couronne et le plateau portant les ergots.CH-A-538.136 describes one such mechanism which makes it possible to reduce the torque to be applied to drive the date indicator. According to this mechanism, the elastic locking device of the date indicator is effectively removed in its different positions, which decreases the torque applied. However, this mechanism has other drawbacks. Such a device comprises a drive disc, an intermediate plate provided with pins which cooperate with the disc and a date display disc which is provided on its internal periphery with deep notches. The intermediate plate is provided with two pins which can penetrate into the notches of the date disc and which can also cooperate with a projection and two notches formed on the periphery of the drive disc. The disc thus drives the date disc by one step at each of its rotations by means of the plate provided with its two pins. The locking of the disc is ensured by the presence of two additional pins mounted on the disc. Outside the drive phases, one of the lugs and one of the pins is supported on the lateral face of the disc thus ensuring the immobilization of the disc while allowing free rotation of the drive disc. This solution has serious drawbacks due to the cooperation between the pins and the slots made in the date disc and between these same pins and the projection made on the drive disc. It is indeed necessary to provide large clearances for the device to function and the immobilization of the disc is therefore poor. In addition, these games cause additional shocks which consume energy and cause friction. In addition, according to this same document, to ensure effective locking of the date crown, there is provided a permanent magnet which effectively holds the crown and the plate carrying the lugs.

La demande de brevet anglais GB-A-2.026.213 décrit un mécanisme de quantième comportant un mobile menant entraîné par le rouage de la montre et muni à sa périphérie d'un secteur denté et un ensemble de transmission comportant une première denture pour engrener avec le secteur denté et une deuxième denture pour entraîner le disque de quantième, ainsi qu'un sautoir coopérant d'une part avec la seconde denture de l'ensemble de transmission et avec une came portée par le mobile menant. Le sautoir monté pivotant sur la platine de la montre, comporte deux bras dont l'un prend appui contre la came et l'autre, élastique, dans la seconde denture. La came est agencée de manière que, lorsque le secteur denté n'est pas en prise avec la première denture, le bras élastique est armé et assure le positionnement du mobile de transmission alors que lorsque le secteur denté engrène avec la première denture, le bras élastique est désarmé et permet au mobile de transmission de tourner librement. La présence du sautoir permet l'entraînement du disque de quantième, par un mécanisme de correction, du moins lorsque le secteur denté n'engrène pas avec la denture du mobile de transmission. Cette solution présente deux inconvénients. Tout d'abord, le sautoir frotte pratiquement en permanence contre la came, d'où une perte d'énergie. En outre, lorsque le secteur denté est en prise, l'entraînement du disque de quantième par le mécanisme de correction risque d'abîmer l'une ou l'autre pièce du mécanisme de quantième.English patent application GB-A-2,026,213 describes a date mechanism comprising a driving mobile driven by the train of the watch and provided at its periphery with a toothed sector and a transmission assembly comprising a first toothing to mesh with the toothed sector and a second toothing to drive the date disc, as well as a jumper cooperating on the one hand with the second toothing of the transmission assembly and with a cam carried by the driving mobile. The jumper pivotally mounted on the watch plate has two arms, one of which bears against the cam and the other, elastic, in the second toothing. The cam is arranged so that, when the toothed sector is not in engagement with the first teeth, the elastic arm is armed and ensures the positioning of the transmission mobile while when the toothed sector meshes with the first teeth, the elastic arm is disarmed and allows the transmission mobile to rotate freely. The presence of the jumper allows the date disc to be driven, by a correction mechanism, at least when the toothed sector does not mesh with the teeth of the transmission mobile. This solution has two drawbacks. First of all, the jumper almost constantly rubs against the cam, resulting in a loss of energy. In addition, when the toothed sector is engaged, the drive of the date disc by the correction mechanism may damage one or the other part of the date mechanism.

La présente invention a précisément pour objet un dispositif d'entraînement intermittent d'une pièce, et plus particulièrement d'un disque de quantième qui ait un faible couple mais qui ne présente pas les inconvénients de l'art antérieur décrit, c'est-à-dire qui assure effectivement un bon verrouillage du disque de quantième dans chaque position, qui évite les chocs et les frottements lors du déplacement du disque et qui permet une correction du disque en tout temps.The present invention specifically relates to an intermittent drive device for a workpiece, and more particularly a date disc which has a low torque but which does not have the drawbacks of the prior art described, that is to say that is to say which effectively ensures a good locking of the date disc in each position, which prevents shocks and friction when the disc is moving and which allows correction of the disc at all times.

Ce but est atteint grâce au fait que, dans le dispositif selon l'invention, l'ensemble de transmission comporte en outre des moyens de liaison escamotables pour solidariser en rotation les deux pignons, tant que le couple de retenue ne dépasse une valeur limite.This object is achieved thanks to the fact that, in the device according to the invention, the transmission assembly also includes retractable connecting means for securing in rotation the two pinions, as long as the holding torque does not exceed a limit value.

On voit qu'ainsi le disque de quantième peut être librement corrigé, quelles que soient les positions relatives du mobile menant et du mobile de transmission, tout en garantissant un bon positionnement du dispositif de quantième, cette position étant définie par les moyens de liaison, tels qu'on sautoir solidaire de l'un des pignons et coopérant avec la denture de l'autre.It can be seen that in this way the date disc can be freely corrected, whatever the relative positions of the driving mobile and the transmission mobile, while guaranteeing correct positioning of the date device, this position being defined by the connecting means, such as a long necklace integral with one of the pinions and cooperating with the teeth of the other.

De préférence, les moyens d'entraînement du mobile menant comportent deux dents d'engrenage qui engrènent avec la denture du mobile de transmission. En outre, les deuxièmes moyens d'immobilisation comprennent n ergots (de préférence 4) solidaires en rotation du mobile de transmission. Ces ergots sont disposés sur un même cercle centré sur l'axe de rotation du mobile de renvoi et ils sont angulairement décalés de 360°/n. En outre, les premiers moyens d'immobilisation comprennent un rebord circulaire qui est solidaire en rotation du mobile menant et disposé au même niveau que les ergots. Ce rebord est muni de deux encoches disposées de telle manière que, lors de la phase d'entraînement de l'indicateur de quantième, un des ergots puisse franchir le rebord et que, au contraire, en dehors des phases d'entraînement de l'indicateur de quantième, deux ou les deux ergots soient en butée sur le rebord pour assurer ainsi le verrouillage du mobile de transmission et en conséquence le verrouillage de l'indicateur de quantième par l'intermédiaire de l'engrènement du mobile de transmission avec la denture du disque de quantième.Preferably, the drive means of the driving mobile comprise two gear teeth which mesh with the teeth of the transmission mobile. In addition, the second immobilization means comprise n pins (preferably 4) integral in rotation with the transmission mobile. These pins are arranged on the same circle centered on the axis of rotation of the return mobile and they are angularly offset by 360 ° / n. In addition, the first immobilization means comprise a circular rim which is integral in rotation with the driving mobile and disposed at the same level as the pins. This rim is provided with two notches arranged in such a way that, during the training phase of the date indicator, one of the lugs can cross the rim and that, on the contrary, outside of the training phases of the date indicator, two or both pins are in abutment on the rim to thus ensure the locking of the transmission mobile and consequently the locking of the date indicator by means of the engagement of the transmission mobile with the teeth of the date disc.

Il faut observer que, selon l'invention, les ergots ne jouent aucun rôle d'entraînement lors de la rotation du mobile de transmission. En conséquence, les dimensions des encoches sur le rebord ne sont pas critiques et il est possible de leur donner une largeur suffisante pour qu'il n'y ait aucun problème d'introduction des ergots dans ces encoches.It should be observed that, according to the invention, the pins do not play any driving role during the rotation of the transmission mobile. Consequently, the dimensions of the notches on the flange are not critical and it is possible to give them a sufficient width so that there is no problem of introduction of the pins in these notches.

De toute façon l'invention sera mieux comprise à la lecture de la description qui suit d'un mode de réalisation de l'invention donné à titre d'exemple non limitatif. La description se réfère au dessin annexé sur lequel:

  • la figure 1 est une vue de dessus de l'ensemble du mécanisme d'entraînement;
  • la figure 2 est une vue en coupe et en élévation du mécanisme selon la ligne II-II de la figure 1;
  • les figures 3 et 4 représentent une partie du mécanisme d'entraînement au début et à la fin d'une phase d'entraînement de l'indicateur de quantième.
In any case, the invention will be better understood on reading the following description of an embodiment of the invention given by way of non-limiting example. The description refers to the attached drawing in which:
  • Figure 1 is a top view of the entire drive mechanism;
  • Figure 2 is a sectional and elevational view of the mechanism along the line II-II of Figure 1;
  • Figures 3 and 4 show a part of the drive mechanism at the start and end of a drive phase of the date indicator.

La description qui suit concerne les cas où le mécanisme sert à entraîner la couronne de quantième dans une montre électronique. Il va cependant de soi que ce mécanisme pourrait être utilisé pour l'entraînement intermittent d'autres pièces mobiles en rotation, dès lors que ces pièces comportent un denture et qu'il est nécessaire d'assurer un verrouillage de la position de la pièce entraînée entre les phases d'entraînement et que cet entraînement intermittent doit être fait avec un couple aussi faible que possible.The following description relates to cases where the mechanism serves to drive the date crown in an electronic watch. It goes without saying, however, that this mechanism could be used for the intermittent drive of other moving parts in rotation, as soon as these parts have teeth and it is necessary to lock the position of the driven part. between the drive phases and that this intermittent drive should be done with as little torque as possible.

La montre comporte de façon classique une chaussée 2 et une roue à canon 4 qui sont montées sur un axe 6 solidaire du bâti 8 de la montre. Une roue de minuterie 10 est entraînée par la chaussée 2 et elle entraîne la roue à canon 4. La chaussée 2 est entraînée de façon classique par un train d'engrenages entraîné par le moteur et qui agit sur la roue des minutes 2a solidaire de la chaussée 2. Ce train d'engrenages et le moteur n'ont pas été représentés, car ils sont de type classique et ils ne concernent pas l'invention. Le pignon 10a de la roue de minuterie 10 engrène avec une roue 12a d'un renvoi de quantième 12. Un pignon 12b faisant partie du renvoi 12 engrène avec un mobile menant portant la référence générale 14 et dont la structure sera décrite ultérieurement. Ce mobile menant 14 coopère avec un ensemble de transmission portant la référence générale 16. Cet ensemble sera également décrit ultérieurement. Enfin, l'ensemble de transmission coopère avec un indicateur de quantième 18 ou couronne de quantième.The watch conventionally comprises a carriageway 2 and a barrel wheel 4 which are mounted on an axis 6 integral with the frame 8 of the watch. A timer wheel 10 is driven by the carriageway 2 and it drives the barrel wheel 4. The carriageway 2 is conventionally driven by a gear train driven by the motor and which acts on the minute wheel 2a integral with the floor 2. This gear train and the motor have not been shown, since they are of the conventional type and they do not relate to the invention. The pinion 10a of the timer wheel 10 meshes with a wheel 12a of a date reference 12. A pinion 12b forming part of the reference 12 meshes with a driving mobile bearing the general reference 14 and whose structure will be described later. This driving mobile 14 cooperates with a transmission assembly bearing the general reference 16. This assembly will also be described later. Finally, the transmission assembly cooperates with a date indicator 18 or date crown.

Le mobile 14 est monté pivotant sur un tenon 20 faisant partie intégrante du bâti 8. Ce mobile est maintenu sur cet axe par la tête d'une vis 22 engagée dans l'alésage taraudé 20a du tenon 20. Le mobile 14 comprend tout d'abord un pignon denté 24 dont le moyeu 24a se prolonge au-delà de la denture. Le mobile 14 comporte une deuxième partie constituée par une portion massive 26. La portion 26 forme d'une part un disque 26a à proximité du bâti 8, ce disque comportant un secteur denté constitué par exemple par deux dents respectivement référencées 26'a et 26"a. La pièce 26 définit, d'autre part, une portion cylindrique 26b dont le diamètre est inférieur à celui du disque 26a. La portion 26b comporte donc une paroi latérale 26'b et une paroi plane 26"b parallèle au disque 26a. La portion cylindrique 26b comporte une rainure 30 ayant sensiblement la forme d'une portion de couronne circulaire qui débouche d'une part dans la face plane 26"b et d'autre part dans la face latérale 26'b par deux encoches 30' et 30". Il fait observer que la portion restant 32 de la pièce cylindrique 26b délimitée par la rainure 30 présente une épaisseur inférieure à l'épaisseur du reste de cette pièce. L'axe de symétrie de la rainure 30 coïncide avec l'axe de symétrie des dents 26'a et 26"a. La pièce 26 comporte de plus un alésage central 26c dans lequel est chassé le moyeu 24a du pignon 24. On réalise ainsi une solidarisation entre ces deux pièces qui tournent ensemble autour de l'axe défini par le tenon 20.The mobile 14 is pivotally mounted on a tenon 20 forming an integral part of the frame 8. This mobile is held on this axis by the head of a screw 22 engaged in the threaded bore 20a of the tenon. The mobile 14 includes all first a toothed pinion 24 whose hub 24a extends beyond the toothing. The mobile 14 has a second part constituted by a portion massive 26. The portion 26 forms on the one hand a disc 26a near the frame 8, this disc comprising a toothed sector constituted for example by two teeth respectively referenced 26'a and 26 "a. The part 26 defines, on the other part, a cylindrical portion 26b whose diameter is less than that of the disc 26a. The portion 26b therefore comprises a side wall 26'b and a flat wall 26 "b parallel to the disc 26a. The cylindrical portion 26b has a groove 30 having substantially the shape of a portion of circular crown which opens on the one hand into the flat face 26 "b and on the other hand into the lateral face 26'b by two notches 30 'and 30". He observes that the remaining portion 32 of the cylindrical part 26b delimited by the groove 30 has a thickness less than the thickness of the rest of this part. The axis of symmetry of the groove 30 coincides with the axis of symmetry of the teeth 26'a and 26 "a. The part 26 further comprises a central bore 26c in which the hub 24a of the pinion 24 is driven. a connection between these two parts which rotate together around the axis defined by the lug 20.

L'ensemble de transmission 16 est monté pivotant autour d'un axe défini par une douille 40 chassée sur un tenon 42 faisant partie intégrante du bâti 8. L'ensemble 16 comprend tout d'abord un pignon 44 monté pivotant autour de la douille 40. L'ensemble 16 comprend également une plaque 46 solidaire en rotation du pignon 44 et qui comprend 4 bras rayonnants 48a, 48b, 48c et 48d à l'extrémité desquels sont fixés des tenons ou ergots 50a, 50b, 50c et 50d. Ces ergots sont disposés sur un même cercle centré sur l'axe XX' de rotation de l'ensemble 16. Les ergots tournent donc en même temps que le pignon 44. La longeur L des bras est telle que deux ergots consécutifs puissent venir au contact de la face latérale 26'b du mobile menant. Leur position est également telle qu'ils puissent pénétrer librement dans la rainure 30 lors du mouvement de rotation relatif du mobile 14 et de l'ensemble de transmission 16. La rainure 30 a une largeur et une profondeur suffisantes pour permettre le libre passage des ergots lors de la rotation relative des deux mobiles. En outre les extrémités 30' et 30" de la rainure 30 sont disposées sur la paroi latérale 26'b de telle manière que, comme on l'expliquera ultérieurement, les ergots puissent effectivement pénétrer dans la rainure 30 lorsque les dents 26'a et 26"a entraînent en rotation l'ensemble de transmission 16. De plus, le pignon 44 est disposé de telle manière qu'il engrène avec les dents 26'a et 26"a du mobile menant pour certaines positions de celui-ci. Enfin, l'ensemble de transmission comprend un deuxième pignon denté 52 qui peut pivoter librement sur la douille 40. La liaison entre le pignon 44 et le pignon 52 est assurée de façon temporaire par un sautoir 54. Ce sautoir 54 est par exemple solidaire de la plaque 46. Lorsque le sautoir 54 remplit sa fonction, les pignons 52 et 44 sont donc solidaires en rotation. La couronne de quantième 18 est munie sur sa périphérie interne de dents 18a qui engrènent avec les dents du pignon 52 de l'ensemble de transmission 16.The transmission assembly 16 is pivotally mounted about an axis defined by a bush 40 driven on a tenon 42 forming an integral part of the frame 8. The assembly 16 firstly comprises a pinion 44 mounted pivoting around the bush 40 The assembly 16 also comprises a plate 46 integral in rotation with the pinion 44 and which comprises 4 radiating arms 48a, 48b, 48c and 48d at the end of which are fixed pins or lugs 50a, 50b, 50c and 50d. These pins are arranged on the same circle centered on the axis XX 'of rotation of the assembly 16. The pins therefore rotate at the same time as the pinion 44. The length L of the arms is such that two consecutive pins can come into contact from the lateral face 26'b of the driving mobile. Their position is also such that they can penetrate freely into the groove 30 during the relative rotational movement of the mobile 14 and the transmission assembly 16. The groove 30 has a width and a depth sufficient to allow the free passage of the pins during the relative rotation of the two mobiles. Furthermore, the ends 30 ′ and 30 ″ of the groove 30 are arranged on the side wall 26 ′ b in such a way that, as will be explained later, the pins can effectively penetrate into the groove 30 when the teeth 26 ′ a and 26 "a drive the transmission assembly 16 in rotation. In addition, the pinion 44 is arranged in such a way that it meshes with the teeth 26'a and 26" a of the moving part leading to certain positions thereof. Finally , the transmission assembly comprises a second toothed pinion 52 which can pivot freely on the bush 40. The connection between the pinion 44 and the pinion 52 is temporarily ensured by a jumper 54. This jumper 54 is for example secured to the plate 46. When the jumper 54 fulfills its function, the pinions 52 and 44 are therefore integral in rotation.The date crown 18 is provided on its internal periphery with teeth 18a which mesh with the teeth of the pinion 52 of the transmission assembly 16.

En d'autres termes, le mobile menant 14 comprend un moyen d'entraînement constitué par les dents 26'a, 26"a; et des premiers moyens d'immobilisation constitués par la rainure 30 et le bord 26'b, et l'ensemble de transmission 16 comprend un mobile de transmission constitué par les pignons 44 et 52 et des deuxièmes moyens d'immobilisation constitués par les ergots 50 fixés au bout des bras 48. En outre, il est clair que la pièce 26b pourrait être remplacée par un simple rebord définissant la paroi latérale 26'b de la pièce 26b, ce rebord étant percé de deux encoches correspondant aux débouchés 30' et 30" de la rainure 30, ménagée dans la pièce 26b.In other words, the driving mobile 14 comprises a drive means constituted by the teeth 26'a, 26 "a; and first immobilization means constituted by the groove 30 and the edge 26'b, and the transmission assembly 16 comprises a transmission mobile constituted by the pinions 44 and 52 and second immobilization means constituted by the lugs 50 fixed at the end of the arms 48. In addition, it is clear that the part 26b could be replaced by a simple rim defining the side wall 26'b of the part 26b, this rim being pierced with two notches corresponding to the outlets 30 'and 30 "of the groove 30, formed in the part 26b.

Il faut ajouter que les rapports d'engrenage entre la roue de minuterie, le mobile de renvoi de quantième 12 et le pignon 24 du mobile menant sont tels que le mobile menant fasse un tour par période de 24 heures. Par ailleurs, le nombre de dents sur le pignon 44 de l'ensemble de transmission est tel que ce pignon fasse un tour par période de 4 jours. En conséquence, pour chaque période de 24 heures, le couronne 18 des quantièmes progresse effectivement d'un pas comme il se doit.It should be added that the gear ratios between the timer wheel, the date return mobile 12 and the pinion 24 of the driving mobile are such that the driving mobile makes one revolution per 24 hour period. Furthermore, the number of teeth on the pinion 44 of the transmission assembly is such that this pinion makes one revolution per period of 4 days. Consequently, for each 24-hour period, the crown 18 of the calendars effectively progresses by one step as it should be.

Le fonctionnement du mécanisme d'entraînement de la couronne de quantième découle de la description précédente. En dehors des phases où la position de la couronne de quantième doit être modifiée, deux des ergots sont en appui sur la face latérale 26'b de la pièce 26b du mobile menant. Ainsi, l'ensemble de transmission 16 est immobilisé en rotation mais le mobile menant 14 peut tourer librement sous l'effet de l'entraînement du renvoi de quantième. Tant qu'aucun couple extérieur important n'est appliqué à la couronne de quantième 18, le sautoir 52 remplit sa fonction et solidarise le plateau 46 avec le pignon 52. Par cet exemple l'extrémité élastique 54 du sautoir coopère avec le pignon 52. Le pignon 52 est donc également immobilisé en rotation et la couronne 18 l'est également du fait de la coopération des dents du pignon 52 avec les dents 18a de la couronne de quantiéme. Il est important d'observer que le pignon 52 est en permanence en prise avec la denture 18a de la couronne. Il s'ensuit que, grâce aux techniques classiques de taillage de pignon denté, il est possible d'avoir un jeu très réduit entre le pignon 52 et la couronne 18, ce qui assure un excellent positionnement de celle-ci. Bien sûr si un couple extérieur est appliqué à la couronne 18, par exemple par un dispositif de correction d'affichage du quantième, la pièce 46 reste verrouillée mais le pignon 52 peut être entraîné en rotation par la couronne grâce à la liaison élastique assurée par le sautoir 54.The operation of the mechanism for driving the date crown follows from the preceding description. Outside of the phases where the position of the date crown must be modified, two of the lugs are supported on the lateral face 26'b of the part 26b of the driving mobile. Thus, the transmission assembly 16 is immobilized in rotation but the driving mobile 14 can rotate freely under the effect of the drive of the date reference. As long as no significant external torque is applied to the date crown 18, the jumper 52 fulfills its function and secures the plate 46 with the pinion 52. In this example, the elastic end 54 of the jumper cooperates with the pinion 52. The pinion 52 is therefore also immobilized in rotation and the crown 18 is also immobilized by the cooperation of the teeth of the pinion 52 with the teeth 18a of the date crown. It is important to observe that the pinion 52 is permanently engaged with the toothing 18a of the crown. It follows that, thanks to conventional toothed pinion cutting techniques, it is possible to have a very small clearance between the pinion 52 and the crown 18, which ensures an excellent positioning of the latter. Of course if an external torque is applied to the crown 18, for example by a calendar display correction device, the part 46 remains locked but the pinion 52 can be rotated by the crown thanks to the elastic connection provided by long necklace 54.

Lorsqu'un déplacement de la couronne de quantième doit intervenir, une des dents 26'a du mobile 14 arrive au contact de la denture du pignon 44. Dans cette situation, un des ergots, par exemple celui qui est référencé 50d et qui était primitivement au contact de la face latérale de la pièce 26b, se trouve devant l'entrée 30' de la rainure 30. C'est ce qui est représenté sur la figure 3. La rotation du mobile 14 dans le sens indiqué par la flèche f provoque la rotation de l'ensemble de transmission 16, c'est-à-dire du pignon 44 qui entraîne la rotation du plateau 46 et du deuxième pignon 52. En conséquence, le pignon 52 commence à provoquer la rotation de la couronne de quantième 18 et les ergots 50 commencent également à pivoter. En particulier, l'ergot 50d pénètre librement dans la rainure 30. Lorsque les dents 26'a et 26"a cessent d'être en prise avec le pignon 44, l'ergot 50d est sorti de la rainure 30 par l'échancrure 30". Par ailleurs, l'ergot 50a est venu au contact de la paroi latérale de la piece 26b. L'ensemble de transmission 16 a effectué une rotation de 90° amenant ainsi la couronne de quantième 18 dans la nouvelle position qu'elle doit occuper. Il n'y a plus, bien sûr, entraînement du mobile de l'ensemble de transmission. De plus celui,ci est verrouillé par l'action des ergots 50a et 50d sur la périphérie de la pièce 26b ou sur la périphérie de la portion 32 de celle-ci. Ce verrouillage par les ergots 50a et 50d est maintenu jusqu'à ce que le mobile menant 14 ait fait un tour pour amener son secteur denté à nouveau en prise avec la pignon 44.When a movement of the date crown has to occur, one of the teeth 26'a of the mobile 14 comes into contact with the teeth of the pinion 44. In this situation, one of the lugs, for example the one referenced 50d and which was originally in contact with the lateral face of the part 26b, is located in front of the entry 30 'of the groove 30. This is what is shown in FIG. 3. The rotation of the mobile 14 in the direction indicated by the arrow f causes the rotation of the transmission assembly 16, that is to say the pinion 44 which causes the rotation of the plate 46 and the second pinion 52. Consequently, the pinion 52 begins to cause the rotation of the date crown 18 and the lugs 50 also begin to pivot . In particular, the lug 50d freely penetrates into the groove 30. When the teeth 26'a and 26 "a cease to be engaged with the pinion 44, the lug 50d is taken out of the groove 30 by the notch 30 ". Furthermore, the lug 50a has come into contact with the side wall of the part 26b. The transmission assembly 16 has rotated 90 ° thus bringing the date crown 18 into the new position which it must occupy. There is no longer, of course, driving the mobile of the transmission assembly. In addition, the latter is locked by the action of the pins 50a and 50d on the periphery of the part 26b or on the periphery of the portion 32 thereof. This locking by the lugs 50a and 50d is maintained until the driving mobile 14 has made a turn to bring its toothed sector back into engagement with the pinion 44.

Il faut simplement observer que, stricto sensu, le verrouillage n'existe pas lorsqu'un des ergots se trouve vis-à-vis d'une des encoches 30' et 30". Cela ne présente pas d'inconvénient majeur du fait que la largeur de cette encoche est sensiblement de l'ordre de grandeur du diamètre des ergots. En conséquence, la fraction de la périphérie 26'b correspondant à cette situation est extrément faible et n'entraîne donc aucun effet dommageable pour le bon fonctionnement du mécanisme.It should simply be observed that, strictly speaking, the locking does not exist when one of the lugs is opposite one of the notches 30 ′ and 30 ″. This does not present any major disadvantage of the fact that the the width of this notch is substantially of the order of magnitude of the diameter of the pins, consequently the fraction of the periphery 26'b corresponding to this situation is extremely small and therefore does not have any damaging effect on the proper functioning of the mechanism.

Dans l'exemple particulier précédemment décrit, le mobile menant 14 fait un tour par 24 heures. Il serait bien sûr possible d'envisager un mécansime d'entraînement dans lequel le mobile menant ferait par exemple un tour pour px24 heures. Dans ce cas, bien entendu, le mobile devrait comporter p secteurs dentés correspondant à la denture 26'a, 26"a et p rainures correspondant à la rainure 30. Par ailleurs, l'ensemble de transmission resterait identique avec ses quatre ergots.In the particular example previously described, the driving mobile 14 makes one revolution per 24 hours. It would of course be possible to envisage a training mechanism in which the leading mobile would, for example, do a lap for px24 hours. In this case, of course, the mobile should have p toothed sectors corresponding to the toothing 26'a, 26 "a and p grooves corresponding to the groove 30. Furthermore, the transmission assembly would remain identical with its four lugs.

Il serait également possible d'envisager un nombre d'ergots différent pour l'ensemble de transmission c'est-à-dire de définir un nombre de positions de verrouillage différent et donc un nombre de jours différents associé à une rotation d'un tour complet de l'ensemble de transmission.It would also be possible to envisage a different number of lugs for the transmission assembly, that is to say to define a different number of locking positions and therefore a number of different days associated with a rotation of one revolution. complete transmission assembly.

Il découle de la description précédente que l'invention permet effectivement d'obtenir un dispositif d'entraînement d'une pièce ou plus précisément d'une couronne de quantième à faible couple. En effet, d'une part il n'existe plus aucun organe de positionnement élastique agissant directement sur la couronne de quantième, d'autre part, les transmissions de mouvement entre les différents mobiles se font effectivement par des engrenages ce qui diminue les jeux et les chocs et ce qui permet d'améliorer le positionnement de l'indicateur de quantième lors du verrouillage ce qui supprime ainsi la nécessité d'organes extérieurs.It follows from the above description that the invention effectively makes it possible to obtain a device for driving a part or more precisely a date crown with low torque. Indeed, on the one hand there is no longer any elastic positioning member acting directly on the date crown, on the other hand, the transmissions of movement between the various mobiles are effectively effected by gears which reduces the clearances and shocks and which improves the positioning of the date indicator during locking which eliminates the need for external organs.

Claims (4)

1. Driving arrangement for intermittent rotation of a component (18) comprising:
a drive gear means (14) pivotally mounted about an axle (20) and including on a portion of its periphery at least one driving means comprising a toothed sector (26'a, 26"a),
a transmission assembly (16) pivotally mounted about an axle (40, 42) and including first and second pinions (44 and 52) each provided with peripheral teeth for meshing respectively with the toothed sector (26'a, 26"a) and teeth borne by said component (18) and
blocking means (30, 26'b, 48, 50) cooperating with one another to allow rotation of the first pinion (44) only when it is engaged with said toothed sector (26'a, 26"a), said blocking means permitting free rotation of the drive gear means (14) characterized in that the transmission assembly further includes retractable coupling means (54) arranged to unite said pinions (44 and 52) in rotation so long as the retaining couple applied to the first pinion does not exceed a certain limit.
2. Driving arrangement according to claim 1 characterized in that said coupling means include a jumper spring (54) rigidly attached to one of said pinions and cooperating elastically with the teeth of the other pinion.
3. Driving arrangement according to claims 1 or 2 characterized in that the toothed sector includes at least two juxtaposed teeth (26'a and 26"a) to mesh with the teeth of the first pinion (44), in that the blocking means comprise first means (30, 26'b) fixed to the drive gear means and provided with a circular rim (26'b) having the same axle (20) as the drive gear means and including two notches (30', 30") and in that said blocking means comprise second means (48, 50) fixed to the first pinion (44) and including n spurs (50) n being greater than or equal to 2 arranged on a common circle centered on the axle (40, 42) of the transmission assembly, said spurs being spread apart by 360°/n and arranged at the same level in accordance with the direction of the rotation axles (20 and 40, 42), as said circular rim (26'b) and as said notches (30', 30") so that one of said spurs (50) may cross over said rim (26'b) during its rotation under the effect of the meshing of said transmission assembly (44, 52) with at least one of the driving means (26'a, 26"a), but that said spurs (50) for n=2 or two of said spurs (50) for n>2 butt against said rim (26'b) outside said notches (30', 30") when there is no meshing.
4. Driving arrangement according to any of claims 1 to 3 characterized in that said component (18) is a date crown of a watch and in that said drive gear means (14) includes moreover a pinion for engaging with a gear train (2, 4, 10, 12) of said watch.
EP82810435A 1981-11-05 1982-10-21 Drive device for intermittently rotating a component part Expired EP0079301B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH7069/81 1981-11-05
CH706981A CH648176GA3 (en) 1981-11-05 1981-11-05

Publications (2)

Publication Number Publication Date
EP0079301A1 EP0079301A1 (en) 1983-05-18
EP0079301B1 true EP0079301B1 (en) 1986-04-30

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EP82810435A Expired EP0079301B1 (en) 1981-11-05 1982-10-21 Drive device for intermittently rotating a component part

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US (1) US4478522A (en)
EP (1) EP0079301B1 (en)
JP (1) JPS5886477A (en)
CH (1) CH648176GA3 (en)
DE (1) DE3270886D1 (en)
HK (1) HK29588A (en)

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SG102647A1 (en) * 2000-12-22 2004-03-26 Ebauchesfabrik Eta Ag Timepiece provided with a date having a large aperture

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Publication number Priority date Publication date Assignee Title
CH4205A (en) * 1891-10-10 1892-03-31 Morris Schoenfeld Automatic stitch determination mechanism for embroidery machines
CH538136A (en) * 1971-02-05 1973-07-31 Suisse Horlogerie Date mechanism for timepiece
US3738097A (en) * 1971-07-12 1973-06-12 Omega Brandt & Freres Sa Louis Mechanism for driving and correcting a data disc in a day-date timepiece
CH494772A4 (en) * 1972-04-05 1975-09-15
CH340575A4 (en) * 1975-03-18 1977-02-28
CH598637B5 (en) * 1975-05-01 1978-05-12 Ebauches Sa
JPS54112677A (en) * 1978-02-22 1979-09-03 Seiko Epson Corp Calendar watch
JPS554552A (en) * 1978-06-27 1980-01-14 Seiko Instr & Electronics Ltd Date feed mechanism of watch
US4240249A (en) * 1979-03-05 1980-12-23 Kruglov Gennady A Instantaneous calendar device for timepieces

Also Published As

Publication number Publication date
DE3270886D1 (en) 1986-06-12
HK29588A (en) 1988-04-29
JPH0337150B2 (en) 1991-06-04
EP0079301A1 (en) 1983-05-18
US4478522A (en) 1984-10-23
CH648176GA3 (en) 1985-03-15
JPS5886477A (en) 1983-05-24

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