EP1636656B1 - Cog system for watch action - Google Patents

Cog system for watch action Download PDF

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Publication number
EP1636656B1
EP1636656B1 EP04766040A EP04766040A EP1636656B1 EP 1636656 B1 EP1636656 B1 EP 1636656B1 EP 04766040 A EP04766040 A EP 04766040A EP 04766040 A EP04766040 A EP 04766040A EP 1636656 B1 EP1636656 B1 EP 1636656B1
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EP
European Patent Office
Prior art keywords
teeth
gear
organ
tooth
driven
Prior art date
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Active
Application number
EP04766040A
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German (de)
French (fr)
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EP1636656A2 (en
Inventor
Eric MÄRKI
Michiel Groothuis
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Ronda AG
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Ronda AG
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Publication of EP1636656A2 publication Critical patent/EP1636656A2/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
    • G04B19/00—Indicating the time by visual means
    • G04B19/24—Clocks or watches with date or week-day indicators, i.e. calendar clocks or watches; Clockwork calendars
    • G04B19/243—Clocks or watches with date or week-day indicators, i.e. calendar clocks or watches; Clockwork calendars characterised by the shape of the date indicator
    • G04B19/247—Clocks or watches with date or week-day indicators, i.e. calendar clocks or watches; Clockwork calendars characterised by the shape of the date indicator disc-shaped
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B11/00—Click devices; Stop clicks; Clutches
    • G04B11/006—Clutch mechanism between two rotating members with transfer of movement in only one direction (free running devices)
    • G04B11/008—Clutch mechanism between two rotating members with transfer of movement in only one direction (free running devices) with friction members, e.g. click springs or jumper
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/19—Gearing
    • Y10T74/1987—Rotary bodies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/19—Gearing
    • Y10T74/1987—Rotary bodies
    • Y10T74/19874—Mutilated
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/19—Gearing
    • Y10T74/1987—Rotary bodies
    • Y10T74/19884—Irregular teeth and bodies

Definitions

  • the present invention relates to a gear for watch movement, in particular a gear used in a watch movement calendar display mechanism, in particular a large date display mechanism.
  • gear means any system for transmitting a movement or a force between two toothed members.
  • the teeth of the drive member, or driving member penetrate between the teeth of the driven member, or driven member to transmit their movement.
  • the gear members may be constituted by rotary members, for example wheels, pinions, ratchets, stars, rings with internal, external or axial teeth, etc., or by racks for transmitting rectilinear movements.
  • gear train operated by each other is sometimes called a gear train.
  • a gear train In a watch movement, one can for example find a counter wheel, a time setting wheel, a gear reducer to drive the needles of a quartz watch, etc.
  • the relative angular position of the drive member and the driven member does not matter; it is not therefore a question of which tooth of the driving member actuates each tooth of the driven member.
  • the two members are mounted on their respective axes so that their teeth interpenetrate each other, but without controlling their angular position.
  • the angular position of the two bodies of the gear can also sometimes be modified. In case of shock, it happens so that a tooth of the drive member is driven with sufficient energy to jump over a tooth of the driven body without moving it. In addition, it sometimes happens that the angular displacement of a step of the drive member causes a greater indentation of the driven member; this circumstance occurs in particular when the linear pitch of the two gears is not identical, for example when the teeth of the driven member are not all separated from each other by the linear pitch of the drive member, and that the drive member is operated with a high energy.
  • This risk can also be reduced by providing a jumper to absorb and limit the rotational energy of the driven member.
  • a jumper thus reduces the risk that the driven member is driven beyond the desired indentation position. This risk, however, is not entirely removed.
  • the two members of a gear each actuate a mobile bearing indications
  • the units of the date are displayed by a first mobile while the tens are displayed by a second mobile driven by the first.
  • the mobile of the tens shows 0, the mobile of the units goes through the sequence from 1 to 9.
  • the mobile of the tens displays 1 or 2
  • the mobile units must go through the session from 0 to 9.
  • the mobile tens displays 3 the mobile units must display the sequence 0 to 1 to display the 30th and 31st days of the month.
  • the relative angular position of the two mobiles is changed, for example following a shock or a setting too energetic time, the correspondence between the tens and the sequences of units can be corrupted.
  • the date display could display combinations of tens and non-existent units, for example dates 32, 33, 34, etc. or skip valid number combinations.
  • a relative angular position of the two mobiles can be restored only by dismounting the movement and moving one of the two gear members to manually restore the relative angular position of the two mobiles.
  • the patent application CH680630A3 for example a timepiece comprising a perpetual calendar mechanism with two wheels each having teeth of a first height and teeth of a second height, only the highest teeth of the drive wheel being able to cause only the highest teeth of the driven wheel.
  • An object of the present invention is to solve the problems of the prior art mentioned above.
  • Another object is to provide a gear in which each tooth of the drive member always drives the same tooth of the driven member.
  • Another object is to provide a gear in which each tooth of the driven member is always driven by the same tooth of the driving member.
  • Another object is to propose a gear in which, whatever the shocks undergone, certain teeth of the driving member never mesh with certain teeth of the driven member.
  • Another object is to propose a gear in which the relative angular position of the two members can be reestablished, if possible automatically, after an impact or an acceleration causing a modification of this relationship.
  • a watch movement gear comprising a drive member provided with z1 first teeth and z2 second teeth.
  • the height of the second teeth is less than the height of the first teeth.
  • the driven member of the gear is provided with z3 third teeth and z4 fourth teeth.
  • the height of the third teeth is greater than the height of the fourth teeth. Heights and tooth shapes are provided so that the first z1 teeth can cause both the z3 third teeth and the z4 fourth teeth, while the z2 second teeth can only drive the z3 third teeth but not the teeth. z4 fourth teeth.
  • the short teeth are always driven by one of the long teeth of the driving organ. This ensures that after a number of indexing steps, the two gear members are in one of the predefined relative angular positions.
  • the driving member comprises a single long tooth
  • the driven member comprises a single short tooth
  • the figure 1 illustrates a gear having a driving gear, or driving gear, 12 with a pitch radius r1, and a driven gear, or driven gear, 50, with a pitch radius r2.
  • the shape of the first teeth 120 and the second 121 is different.
  • the height of the long teeth 120 is illustrated by the reference h1 while that of the short teeth 121 is h2.
  • the pitch and the linear pitch between the teeth are irregular; in this example, it seems to be missing a tooth.
  • the invention is however not limited to these particular values of z1, z2, z3 and z4; in particular, it is possible to provide a plurality of adjacent or non-adjacent long teeth on the member 12, and several adjacent or non-adjacent short teeth on the member 50.
  • the teeth of the gear member 50 have the same pitch; the invention is also particularly useful in the case of gears with driven members having irregular pitch and linear pitch.
  • the height and / or the shape of the long tooth 120 of the wheel 12 makes it possible to drive both the z3 long teeth and the short tooth 503.
  • the height and / or the shape of the short z2 teeth makes it possible to drive only the z3 long teeth but not the tooth 503 shorter.
  • the long tooth 120 is about to mesh with the short tooth 503.
  • the drive wheel 12 had to jump a tooth, that is, if the tooth 120 was to end at beyond the tooth 503 without it being driven, the short driven tooth 503 would end up facing z2 teeth too short to mesh with it. In this case, the drive wheel 12 would turn one full revolution before a long tooth 120 can actuate the tooth 503. The relative angular position of the two wheels 12 and 50 is thus automatically restored after z2 no indexing.
  • the driven member 50 could be actuated by this tooth 120 with sufficient energy to be indented two steps.
  • a jumper on the organ 50 would limit, but not eliminate this risk.
  • the relative phase position of the two organs would be modified; the driven member 50 would be ahead of a tooth.
  • the short tooth 503 would end up next to a tooth 121 instead of facing the only long tooth 120 able to actuate it.
  • the member 50 should then let the drive member rotate a step before the tooth 503 can be actuated; the relative position of the two bodies is thus also restored after z2 no indexation.
  • the gear of the invention may be used whenever, in a watch movement, the relative angular position (or phase) of the driving member and the driven member must remain constant, or when this position can not take arbitrary values.
  • the date display mechanism described uses two distinct mobiles 1 and 2 superimposed on the figure 2 and illustrated separately on Figures 3a and 3b .
  • the mobile 1 of the figure 3b mainly displays the units while the mobile 2 shown on the figure 3a includes mainly the tens of the dates; however, some dates (in this example, dates 20, 30, and 31) may be displayed by a single mobile.
  • a mechanical or electromechanical control system makes it possible to display the correct ten-unit combination every day through one or more wickets 60 in the dial 6 (FIG. Figures 4 and 5 ).
  • the first mobile 1, or ring of units, visible on the figure 3b bears a sequence of digits ⁇ 1,2,3,4,5,6,7,8,9,0, 1,2,3,4,5,6,7,8,9,1,2, 3,4,5,6,7,8,9 ⁇ .
  • the numbers are evenly spaced except for a larger interval between the second 9 and the third 1, then a double interval between the last 9 and the first 1, the width of the intervals being sufficient to display a date to two figures, as will be seen later.
  • the dates are intended to be displayed at twelve o'clock on the dial; the figures of the units are thus arranged almost radially, so as to appear vertical when viewed through a vertical window 60 just to the right of the twelve o'clock position. Other positions of the date display window (s) are possible within the scope of this invention.
  • the second mobile, or tens ring is constituted by a second ring 2 concentrically rotating over the ring of the units 1, as can be seen in particular on the Figures 4 and 5 .
  • the dial 6 of the watch is at the bottom.
  • the second ring 2 bears the sequence ⁇ 0,1,20,2,30,31,0,1,20,2,30,31 ⁇ .
  • a vertical window 21 is stamped through the tens ring 2 to the right of the numerals 0, 1 and 2, to see the numbers (reference 10) carried by the ring of the units 1.
  • the date 3 displayed through the or wickets 60 in the dial therefore generally corresponds to the combination of a dozen displayed by the mobile 2 and a unit printed on the mobile 1 and seen through a window 21.
  • the display mechanism of the invention is therefore a combination between a large date display mechanism, with two digits carried by two distinct mobiles, and a conventional date display mechanism for other dates, for which the single digit or the two digits of the date are carried by the same mobile. This avoids, at least for some dates, the disadvantages of the display by two distinct mobiles, without having to give up the display of large dates.
  • the two mobiles are driven by the same electromechanical or mechanical motor (not shown) and set by the same crown; it would however also be possible to drive and / or adjust the two mobiles by two independent motors, or by a single motor but through two separate kinematic chains.
  • a pinion 44 actuated by the not shown motor drives a wheel 46 on the axis of which is mounted a pawl device 460 arranged to cause rotation, each day, at midnight or at another time, the internal toothing 11 in the ring of units 1.
  • Ring 1 is indexed every day by 360/31 degrees to perform one round per month of 31 days. Others not indexing are possible for example in the case of a perpetual display.
  • a jumper 110 retains the internal toothing 11.
  • the linear pitch of the teeth 120, 121 on the ring of the units is therefore irregular and different from the linear pitch of the teeth of the star 50; in this example, there are missing teeth on the drive member.
  • the star 50 drives at each rotation a wheel 52 mounted on the same axis, which in turn actuates a wheel 53.
  • the wheel 53 is mounted on the axis of a wheel 54 meshing with the internal toothing 22 of the ring 2.
  • the gear ratio between the wheels 50 and 53 is chosen so that the indexing angle of the tens ring 2 caused by a displacement of the star 50 corresponds to the angular distance between two digits tens.
  • the star 50 is retained by a jumper 51 pressed against the gap 502 between two teeth 501 of the star 50 by a spring 510.
  • the jumper prevents the star 50 from spinning freely, particularly when is driven by a tooth 120, 121.
  • the construction and operation of the jumper are described in more detail below in connection with the figure 6 .
  • the first mobile 1 slides directly on the upper deck 9 of the movement of the watch, and is retained by a first plate 8 mounted over this bridge.
  • the second mobile 2 slides on an annular path over this first plate 8 and is retained by a second plate 7.
  • the dial 6 is fixed over the second plate and provided with a window 60 to display the dates carried by the first and / or second mobile.
  • the teeth 120, 121 of the mobile units have heights h1, h2, and possibly different shapes or positions, as can be seen more particularly on the figure 6 .
  • the first tooth (or stop) 120 of the ring of units is higher than the other teeth 121.
  • the size of the lugs 120 and 121 is possibly identical, but their distance to the center of the ring is different.
  • the height h1, h2 of the teeth 120, 121 thus depends on the vertex of their projection on a plane parallel to the platen of the movement; a tooth 120 is considered high because it passes closer to the center of the star 50 than the teeth 121.
  • the teeth of the star 50 have heights h3 and h4 and variable shapes, the teeth 501 being higher than the tooth 503.
  • the lugs 120, 121 are placed in the illustrated example at irregular distances in order to mesh the star 50 only on days when an indentation of the tens ring is necessary.
  • the linear pitch between the lugs 120, 121 existing is furthermore preferably variable in order to obtain an optimum contact angle between any combination of teeth 120 or 121 and the portions 5012, 5013 of the teeth 501, 503.
  • the lugs 120, 121 are therefore not placed at angular positions separated by multiples of the gear pitch.
  • the height h2 of the short teeth 121 does not allow them to mesh with the single short tooth 503 of the star 50. In this way, when the star 50 and the ring of the tens 2 are accidentally incremented by one of the lugs 121 of two not instead of one, the short tooth 503 is facing a short lug 121. In this position not shown, the star 50 is no longer driven.
  • the tens ring 2 can only be actuated when, after a sufficient number of increments of the ring of the units, a high driving tooth 120 is found in front of the driven tooth 503. This arrangement thus makes it possible to ensure that the short tooth 503 will always be driven by the long tooth 120 rather than any other tooth 121. It is thus possible to restore the relative angular position of the two members 1 and 50, simply by letting the ring of the units 1 rotate sufficiently for a long time or by turning it manually using the date correction rod.
  • the figure 6 also illustrates a preferred embodiment of the jumper 51 which pivots about an axis 512 and supports by means of a spring element 510 on the star 50.
  • the shape of the jumper allows it to be supported in position resting on the posterior face 5010 of a tooth of the star 50 and on the anterior face 5011 of a non-adjacent tooth; in order to limit the friction, the contact with the intermediate tooth 501 is zero or in any case limited to a small surface.
  • the support on the rear face 5010 makes it possible to prevent the star from rotating in the opposite direction to the desired direction; the support on the front face 5011 can raise the jumper 51 when the star is rotated by the disk of the units 1.
  • the jumper leans on three adjacent teeth, or possibly on two non-adjacent teeth even when one or more teeth facing the jumper have a shorter height.
  • the jumper 51 is ready to be lifted by the anterior portion 5011 of the last tooth in contact with the jumper.
  • the latter tooth is a short tooth 503; in this case the shape of the anterior face 5031 of this tooth does not allow him to lift the jumper 51, which is then raised by the front face 5014 of the intermediate tooth pressing the portion 513 of the jumper.
  • a pin 511 perpendicular to the plane of the jumper and the plate of the movement moves in a slide 500 (shown in FIGS. figures 2 , 5 and 6 ) machined in the wheel 52, whose shape prevents the pin 511 from jumping directly from a gap 502 to a non-adjacent gap between two teeth of the star 50.
  • the slider 500 therefore approximately matches the contours of the star 50 so forcing the pin 511, and thus the jumper 51, to move to the bottom of the gap 502 between two teeth. This limits the risk that the star 50 is incremented by two notches when it is actuated by the teeth 120, 121 of the ring of the units 1.
  • gears with driven and driving members each having two distinct tooth heights relate to gears with driven and driving members each having two distinct tooth heights; the invention is however not limited to this example, and the skilled person will understand the advantages that can be obtained with gear members comprising more than two heights of teeth. For example, one could use three heights of teeth on each wheel with different possibilities of mutual meshing.

Abstract

Gear for day of the month display mechanism in a watch movement, including: a driving organ ( 1 ), a driven organ ( 50 ), characterized in that said driving organ ( 1 ) is provided with z 1 first teeth ( 120 ) and z 2 second teeth ( 121 ), the height of the second teeth ( 121 ) being lower than the height of the first teeth ( 120 ), and in that said driven organ ( 50 ) is provided with z 3 third teeth ( 501 ) and z 4 fourth teeth ( 503 ), the height of the third teeth ( 501 ) being greater than the height of the fourth teeth ( 503 ), the height of the z 1 first teeth ( 120 ) allowing the z 3 third teeth ( 501 ) as well as the z 4 fourth teeth ( 503 ) to be driven, the height of the z 2 second teeth ( 121 ) allowing however only the z 3 third teeth ( 501 ) but not the z 4 fourth teeth ( 503 ) to be driven.

Description

La présente invention concerne un engrenage pour mouvement de montre, en particulier un engrenage utilisé dans un mécanisme d'affichage du quantième pour mouvement de montre, en particulier un mécanisme d'affichage de quantième de grande taille.The present invention relates to a gear for watch movement, in particular a gear used in a watch movement calendar display mechanism, in particular a large date display mechanism.

Dans cette description et dans les revendications, on désigne par engrenage tout système permettant de transmettre un mouvement ou une force entre deux organes dentés. Les dents de l'organe d'entraînement, ou organe menant, pénètrent entre les dents de l'organe entraîné, ou organe mené pour leur transmettre leur mouvement. Les organes d'engrenages peuvent être constitués par des organes rotatifs, par exemple des roues, des pignons, des rochets, des étoiles, des anneaux à denture interne, externe ou axiale, etc, ou par des crémaillères pour transmettre des mouvements rectilignes.In this description and in the claims, gear means any system for transmitting a movement or a force between two toothed members. The teeth of the drive member, or driving member, penetrate between the teeth of the driven member, or driven member to transmit their movement. The gear members may be constituted by rotary members, for example wheels, pinions, ratchets, stars, rings with internal, external or axial teeth, etc., or by racks for transmitting rectilinear movements.

Les mouvements de montre mécaniques et les mouvements à affichages analogiques, en particulier, comportent un grand nombre d'engrenages. Un train d'engrenages actionnés les uns par les autres est parfois appelé un rouage. Dans un mouvement de montre, on peut par exemple trouver un rouage compteur, un rouage de mise à l'heure, un rouage réducteur pour entraîner les aiguilles d'une montre à quartz, etc.Mechanical watch movements and movements with analog displays, in particular, have a large number of gears. A gear train operated by each other is sometimes called a gear train. In a watch movement, one can for example find a counter wheel, a time setting wheel, a gear reducer to drive the needles of a quartz watch, etc.

Dans la plupart des rouages, la position angulaire relative de l'organe d'entraînement et de l'organe entraîné importe peu; on ne se préoccupe donc pas de savoir quelle dent de l'organe d'entraînement actionne chaque dent de l'organe entraîné. Lors du montage de l'engrenage, les deux organes sont donc montés sur leur axes respectifs de façon à ce que leurs dents s'interpénétrent mutuellement, mais sans contrôler leur position angulaire.In most workings, the relative angular position of the drive member and the driven member does not matter; it is not therefore a question of which tooth of the driving member actuates each tooth of the driven member. When mounting the gear, the two members are mounted on their respective axes so that their teeth interpenetrate each other, but without controlling their angular position.

La position angulaire des deux organes de l'engrenage peut d'ailleurs parfois être modifiée. En cas de choc, il arrive ainsi qu'une dent de l'organe d'entraînement soit entraînée avec suffisamment d'énergie pour sauter par-dessus une dent de l'organe entraîné sans la déplacer. En outre, il arrive parfois que le déplacement angulaire d'un pas de l'organe d'entraînement provoque une indentation plus importante de l'organe entraîné; cette circonstance se produit notamment lorsque le pas linéaire des deux engrenages n'est pas identique, par exemple lorsque les dents de l'organe entraîné ne sont pas toutes séparées les unes des autres par le pas linéaire de l'organe d'entraînement, et que l'organe d'entraînement est actionné avec une énergie importante.The angular position of the two bodies of the gear can also sometimes be modified. In case of shock, it happens so that a tooth of the drive member is driven with sufficient energy to jump over a tooth of the driven body without moving it. In addition, it sometimes happens that the angular displacement of a step of the drive member causes a greater indentation of the driven member; this circumstance occurs in particular when the linear pitch of the two gears is not identical, for example when the teeth of the driven member are not all separated from each other by the linear pitch of the drive member, and that the drive member is operated with a high energy.

Suite à ces circonstances, la position angulaire relative des deux organes est modifiée. Lorsque le rouage sert uniquement à multiplier ou à démultiplier un mouvement angulaire, les conséquences sont généralement insignifiantes, en sorte que la plupart des engrenages conventionnels ne comportent aucun moyen pour remédier à cet inconvénient.Following these circumstances, the relative angular position of the two bodies is changed. When the gear train only serves to multiply or multiply an angular movement, the consequences are generally insignificant, so that most conventional gears have no means to overcome this disadvantage.

Ce risque peut d'ailleurs être réduit en prévoyant un sautoir pour absorber et limiter l'énergie de rotation de l'organe entraîné. Un sautoir permet ainsi de réduire le risque que l'organe entraîné soit entraîné au-delà de la position d'indentation désirée. Ce risque n'est cependant pas entièrement supprimé.This risk can also be reduced by providing a jumper to absorb and limit the rotational energy of the driven member. A jumper thus reduces the risk that the driven member is driven beyond the desired indentation position. This risk, however, is not entirely removed.

Lorsque les deux organes d'un engrenage actionnent chacun un mobile portant des indications, il est parfois important que la position angulaire relative des deux organes reste constante. Par exemple, dans le cas d'un affichage de grande date, il est fréquent que les unités de la date soient affichées par un premier mobile tandis que les dizaines sont affichées par un second mobile entraîné par le premier. Lorsque le mobile des dizaines affiche 0, le mobile des unités parcourt la séquence de 1 à 9. Lorsque le mobile des dizaines affiche 1 ou 2, le mobile des unités doit parcourir la séance de 0 à 9. Enfin, lorsque le mobile des dizaines affiche 3, le mobile des unités doit afficher la séquence 0 à 1 pour afficher les quantièmes 30 et 31 du mois.When the two members of a gear each actuate a mobile bearing indications, it is sometimes important that the relative angular position of the two bodies remains constant. For example, in the case of a large date display, it is common that the units of the date are displayed by a first mobile while the tens are displayed by a second mobile driven by the first. When the mobile of the tens shows 0, the mobile of the units goes through the sequence from 1 to 9. When the mobile of the tens displays 1 or 2, the mobile units must go through the session from 0 to 9. Finally, when the mobile tens displays 3, the mobile units must display the sequence 0 to 1 to display the 30th and 31st days of the month.

Si la position angulaire relative des deux mobiles est modifiée, par exemple suite à un choc ou à une mise à l'heure trop énergique, la correspondance entre les dizaines et les séquences d'unités peut être corrompue. Dans ce cas, l'afficheur de date pourrait afficher des combinaisons de dizaines et d'unités inexistantes, par exemple des quantièmes 32, 33, 34, etc. ou sauter des combinaisons de chiffres valides. Une position angulaire relative des deux mobiles ne peut être rétablie qu'en démontant le mouvement et en déplaçant un des deux organes d'engrenage pour rétablir manuellement la position angulaire relative des deux mobiles.If the relative angular position of the two mobiles is changed, for example following a shock or a setting too energetic time, the correspondence between the tens and the sequences of units can be corrupted. In this case, the date display could display combinations of tens and non-existent units, for example dates 32, 33, 34, etc. or skip valid number combinations. A relative angular position of the two mobiles can be restored only by dismounting the movement and moving one of the two gear members to manually restore the relative angular position of the two mobiles.

Un problème similaire se pose notamment dans les dispositifs à quantièmes perpétuels ou semi-perpétuels.A similar problem arises particularly in devices with perpetual or semi-perpetual calendars.

La demande de brevet CH680630A3 décrit par exemple une pièce d'horlogerie comprenant un mécanisme de quantième perpétuel avec deux roues ayant chacune des dents d'une première hauteur et des dents d'une deuxième hauteur, seules les dents les plus hautes de la roue d'entraînement pouvant entraîner uniquement les dents les plus hautes de la roue entraînée.The patent application CH680630A3 for example a timepiece comprising a perpetual calendar mechanism with two wheels each having teeth of a first height and teeth of a second height, only the highest teeth of the drive wheel being able to cause only the highest teeth of the driven wheel.

Un but de la présente invention est résoudre les problèmes de l'art antérieur mentionnés ci-dessus.An object of the present invention is to solve the problems of the prior art mentioned above.

Un autre but est de proposer un engrenage dans lequel chaque dent de l'organe d'entraînement entraîne toujours la même dent de l'organe entraîné.Another object is to provide a gear in which each tooth of the drive member always drives the same tooth of the driven member.

Un autre but est de proposer un engrenage dans lequel chaque dent de l'organe entraîné est toujours entraînée par la même dent de l'organe entraînant.Another object is to provide a gear in which each tooth of the driven member is always driven by the same tooth of the driving member.

Un autre but est de proposer un engrenage dans lequel, quels que soient les chocs subis, certaines dents de l'organe entraînant n'engrènent jamais avec certaines dents de l'organe entraîné.Another object is to propose a gear in which, whatever the shocks undergone, certain teeth of the driving member never mesh with certain teeth of the driven member.

Un autre but est de proposer un engrenage dans lequel la position angulaire relative des deux organes peut être rétablie, si possible automatiquement, après un choc ou une accélération entraînant une modification de cette relation.Another object is to propose a gear in which the relative angular position of the two members can be reestablished, if possible automatically, after an impact or an acceleration causing a modification of this relationship.

Selon l'invention, ces buts sont atteints au moyen d'un engrenage comprenant les caractéristiques de la revendication indépendante, des modes de réalisation particuliers étant en outre indiqués dans les revendications dépendantes.According to the invention, these objects are achieved by means of a gear comprising the features of the independent claim, particular embodiments being further indicated in the dependent claims.

En particulier, ces buts sont atteints au moyen d'un engrenage pour mouvement de montre, comprenant un organe d'entraînement muni de z1 premières dents et de z2 deuxièmes dents. La hauteur des deuxièmes dents est inférieure à la hauteur des premières dents. L'organe entraîné de l'engrenage est muni de z3 troisièmes dents et de z4 quatrièmes dents. La hauteur des troisièmes dents est supérieure à la hauteur des quatrièmes dents. Les hauteurs et les formes de dents sont prévues de manière à ce que les z1 premières dents puissent entraîner aussi bien les z3 troisièmes dents que les z4 quatrièmes dents, tandis que les z2 deuxièmes dents permettent uniquement d'entraîner les z3 troisièmes dents mais pas les z4 quatrièmes dents.In particular, these objects are achieved by means of a watch movement gear comprising a drive member provided with z1 first teeth and z2 second teeth. The height of the second teeth is less than the height of the first teeth. The driven member of the gear is provided with z3 third teeth and z4 fourth teeth. The height of the third teeth is greater than the height of the fourth teeth. Heights and tooth shapes are provided so that the first z1 teeth can cause both the z3 third teeth and the z4 fourth teeth, while the z2 second teeth can only drive the z3 third teeth but not the teeth. z4 fourth teeth.

Ainsi, les z4 dents courtes sont toujours entraînées par une des z1 longues dents de l'organe entraînant. On garantit ainsi que, après un certain nombre de pas d'indexation, les deux organes de l'engrenage se retrouvent dans une des positions angulaires relatives possibles prédéfinies.Thus, the short teeth are always driven by one of the long teeth of the driving organ. This ensures that after a number of indexing steps, the two gear members are in one of the predefined relative angular positions.

Si l'organe entraînant comporte une seule longue dent, et que l'organe entraîné comporte une seule dent courte, on garantit ainsi qu'après un nombre de pas suffisant cette dent courte sera entraînée à chaque tour par la même dent longue de l'organe entraînant. La position angulaire relative des deux organes reste ainsi constante.If the driving member comprises a single long tooth, and the driven member comprises a single short tooth, it is thus ensured that after a sufficient number of steps this short tooth will be driven at each turn by the same long tooth of the driving organ. The relative angular position of the two bodies thus remains constant.

L'invention sera mieux comprise à la lecture de la description d'un exemple de réalisation illustré par les figures annexées qui montrent:

  • La figure 1 un schéma d'engrenage selon l'invention.
  • La figure 2 une vue simplifiée du mécanisme d'entraînement des quantièmes dans un mouvement d'horlogerie comprenant un engrenage selon l'invention.
  • La figure 3a montre une vue de dessus de l'anneau des dizaines dans une variante de l'invention.
  • La figure 3b montre une vue de dessus de l'anneau des unités dans une variante de l'invention.
  • La figure 4 montre une coupe partielle selon l'axe IV-IV du mécanisme d'entraînement selon l'invention
  • La figure 5 montre une coupe partielle selon l'axe V-V du mécanisme d'entraînement selon l'invention
  • La figure 6 illustre l'engrenage de l'invention utilisé dans le mécanisme d'entraînement des quantièmes de l'invention.
The invention will be better understood on reading the description of an exemplary embodiment illustrated by the appended figures which show:
  • The figure 1 a gear scheme according to the invention.
  • The figure 2 a simplified view of the date drive mechanism in a clockwork movement comprising a gear according to the invention.
  • The figure 3a shows a top view of the tens ring in a variant of the invention.
  • The figure 3b shows a top view of the ring of units in a variant of the invention.
  • The figure 4 shows a partial section along the axis IV-IV of the drive mechanism according to the invention
  • The figure 5 shows a partial section along the axis VV of the drive mechanism according to the invention
  • The figure 6 illustrates the gear of the invention used in the date drive mechanism of the invention.

La figure 1 illustre un engrenage comportant une roue dentée d'entraînement, ou roue menante, 12 avec un rayon primitif r1, et une roue dentée entraînée, ou roue menée, 50, avec un rayon primitif r2. Selon l'invention, la roue d'entraînement 12 comporte dans cet exemple z1=1 dent longue 120 et z2=9 dents plus courtes 121. Dans cet exemple, la forme des premières dents 120 et des deuxièmes 121 est différente. La hauteur des dents longues 120 est illustrée par la référence h1 tandis que celle des dents courtes 121 porte la référence h2. Par ailleurs, le pas et le pas linéaire entre les dents sont irréguliers; dans cet exemple, il semble manquer une dent. La roue entraînée 50 comporte quant à elle z3=14 dents 501 longues avec une hauteur h3 et z4=1 dent 503 avec une hauteur h4 plus courte. L'invention n'est cependant pas limitée à ces valeurs particulières de z1, z2, z3 et z4; en particulier, il est possible de prévoir plusieurs dents longues adjacentes ou non adjacentes sur l'organe 12, et plusieurs dents courtes adjacentes ou non adjacentes sur l'organe 50.The figure 1 illustrates a gear having a driving gear, or driving gear, 12 with a pitch radius r1, and a driven gear, or driven gear, 50, with a pitch radius r2. According to the invention, the drive wheel 12 comprises in this example z1 = 1 long tooth 120 and z2 = 9 shorter teeth 121. In this example, the shape of the first teeth 120 and the second 121 is different. The height of the long teeth 120 is illustrated by the reference h1 while that of the short teeth 121 is h2. Moreover, the pitch and the linear pitch between the teeth are irregular; in this example, it seems to be missing a tooth. The driven wheel 50 has meanwhile z3 = 14 teeth 501 long with a height h3 and z4 = 1 tooth 503 with a height h4 shorter. The invention is however not limited to these particular values of z1, z2, z3 and z4; in particular, it is possible to provide a plurality of adjacent or non-adjacent long teeth on the member 12, and several adjacent or non-adjacent short teeth on the member 50.

Dans cet exemple, les dents de l'organe 50 de l'engrenage ont le même pas; l'invention est aussi particulièrement utile dans le cas d'engrenages avec des organes entraînés comportant un pas et un pas linéaire irréguliers.In this example, the teeth of the gear member 50 have the same pitch; the invention is also particularly useful in the case of gears with driven members having irregular pitch and linear pitch.

La hauteur et/ou la forme de la longue dent 120 de la roue 12 permet d'entraîner aussi bien les z3 longues dents que la dent courte 503. En revanche, la hauteur et/ou la forme des z2 courtes dents permet d'entraîner uniquement les z3 longues dents mais pas la dent 503 plus courtes. Dans la situation illustrée sur la figure 1, la longue dent 120 s'apprête à engrener avec la dent courte 503. Cependant, si pour une raison quelconque, la roue d'entraînement 12 devait sauter une dent, c'est-à-dire si la dent 120 devait se retrouver au-delà de la dent 503 sans que celle-ci ait été entraînée, la dent entraînée courte 503 se retrouverait face à z2 dents trop courtes pour l'engrener. Dans ce cas, la roue d'entraînement 12 effectuerait un tour complet avant qu'une longue dent 120 puisse actionner la dent 503. La position angulaire relative des deux roues 12 et 50 est ainsi automatiquement rétablie après z2 pas d'indexation.The height and / or the shape of the long tooth 120 of the wheel 12 makes it possible to drive both the z3 long teeth and the short tooth 503. On the other hand, the height and / or the shape of the short z2 teeth makes it possible to drive only the z3 long teeth but not the tooth 503 shorter. In the situation illustrated on the figure 1 , the long tooth 120 is about to mesh with the short tooth 503. However, if for any reason the drive wheel 12 had to jump a tooth, that is, if the tooth 120 was to end at beyond the tooth 503 without it being driven, the short driven tooth 503 would end up facing z2 teeth too short to mesh with it. In this case, the drive wheel 12 would turn one full revolution before a long tooth 120 can actuate the tooth 503. The relative angular position of the two wheels 12 and 50 is thus automatically restored after z2 no indexing.

Par ailleurs, comme il manque une dent après la dent longue 120, l'organe entraîné 50 pourrait être actionné par cette dent 120 avec une énergie suffisante pour être indenté de deux pas. Un sautoir sur l'organe 50 permettrait de limiter, mais pas de supprimer ce risque. Dans un tel cas, la position de phase relative des deux organes serait modifiée; l'organe entraîné 50 serait en avance d'une dent. Toutefois, au plus tard après un tour, la dent courte 503 se retrouverait en regard d'une dent 121 au lieu d'être en regard de la seule dent longue 120 capable de l'actionner. Dans ce cas, l'organe 50 devrait alors laisser tourner l'organe d'entraînement d'un pas avant que la dent 503 puisse être actionnée; la position relative des deux organes est ainsi également rétablie après z2 pas d'indexation.Furthermore, since a tooth is missing after the long tooth 120, the driven member 50 could be actuated by this tooth 120 with sufficient energy to be indented two steps. A jumper on the organ 50 would limit, but not eliminate this risk. In such a case, the relative phase position of the two organs would be modified; the driven member 50 would be ahead of a tooth. However, at the latest after one turn, the short tooth 503 would end up next to a tooth 121 instead of facing the only long tooth 120 able to actuate it. In this case, the member 50 should then let the drive member rotate a step before the tooth 503 can be actuated; the relative position of the two bodies is thus also restored after z2 no indexation.

L'engrenage de l'invention peut être utilisé à chaque fois que, dans un mouvement de montre, la position angulaire (ou phase) relative de l'organe d'entraînement et de l'organe entraîné doit rester constante, ou lorsque cette position ne peut pas prendre des valeurs arbitraires. Nous allons maintenant décrire à l'aide des figures 2 à 6 une application de cet engrenage à un mécanisme d'entraînement des quantièmes dans un affichage à grande date.The gear of the invention may be used whenever, in a watch movement, the relative angular position (or phase) of the driving member and the driven member must remain constant, or when this position can not take arbitrary values. We will now describe using Figures 2 to 6 an application of this gear to a date drive mechanism in a large date display.

Le mécanisme d'affichage de date décrit utilise deux mobiles distincts 1 et 2, superposés sur la figure 2 et illustrés séparément sur les figures 3a et 3b. Le mobile 1 de la figure 3b affiche principalement les unités tandis que le mobile 2 illustré sur la figure 3a comporte principalement les dizaines des quantièmes; toutefois, certaines dates (dans cet exemple, les dates 20, 30 et31) peuvent être affichées par un seul mobile. Un système de contrôle mécanique ou électromécanique permet d'afficher chaque jour la bonne combinaison dizaine-unité au travers d'un ou plusieurs guichets 60 dans le cadran 6 (figures 4 et 5).The date display mechanism described uses two distinct mobiles 1 and 2 superimposed on the figure 2 and illustrated separately on Figures 3a and 3b . The mobile 1 of the figure 3b mainly displays the units while the mobile 2 shown on the figure 3a includes mainly the tens of the dates; however, some dates (in this example, dates 20, 30, and 31) may be displayed by a single mobile. A mechanical or electromechanical control system makes it possible to display the correct ten-unit combination every day through one or more wickets 60 in the dial 6 (FIG. Figures 4 and 5 ).

Le premier mobile 1, ou anneau des unités, visible sur la figure 3b, porte une séquence de chiffres 10 {1,2,3,4,5,6,7,8,9,0, 1,2,3,4,5,6,7,8,9,1,2,3,4,5,6,7,8,9}. Les chiffres sont régulièrement espacés à l'exception d'un intervalle plus important entre le deuxième 9 et le troisième 1, puis d'un double intervalle entre le dernier 9 et le premier 1, la largeur des intervalles étant suffisante pour afficher un quantième à deux chiffres, comme on le verra plus loin. Dans l'exemple illustré, les quantièmes sont destinés à être affichés à douze heures sur le cadran; les chiffres des unités sont donc disposés presque radialement, de manière à apparaître verticaux lorsqu'ils sont vus au travers d'un guichet vertical 60 juste à droite de la position douze heures. D'autres positions du ou des guichets d'affichage de date sont possibles dans le cadre de cette invention.The first mobile 1, or ring of units, visible on the figure 3b , bears a sequence of digits {1,2,3,4,5,6,7,8,9,0, 1,2,3,4,5,6,7,8,9,1,2, 3,4,5,6,7,8,9}. The numbers are evenly spaced except for a larger interval between the second 9 and the third 1, then a double interval between the last 9 and the first 1, the width of the intervals being sufficient to display a date to two figures, as will be seen later. In the illustrated example, the dates are intended to be displayed at twelve o'clock on the dial; the figures of the units are thus arranged almost radially, so as to appear vertical when viewed through a vertical window 60 just to the right of the twelve o'clock position. Other positions of the date display window (s) are possible within the scope of this invention.

Le deuxième mobile, ou anneau des dizaines, est constitué par un deuxième anneau 2 tournant de manière concentrique par-dessus l'anneau des unités 1, comme on le voit en particulier sur les figures 4 et 5. A noter que sur ces figures le cadran 6 de la montre se trouve en bas. Comme on le voit en particulier sur la figure 3a, le deuxième anneau 2 porte dans cet exemple la séquence {0,1,20,2,30,31,0,1,20,2,30,31}. Une fenêtre verticale 21 est étampée à travers l'anneau des dizaines 2 à droite des chiffres 0, 1 et 2, permettant de voir les chiffres (référence 10) portés par l'anneau des unités 1.The second mobile, or tens ring, is constituted by a second ring 2 concentrically rotating over the ring of the units 1, as can be seen in particular on the Figures 4 and 5 . Note that in these figures the dial 6 of the watch is at the bottom. As we especially sees on the figure 3a in this example, the second ring 2 bears the sequence {0,1,20,2,30,31,0,1,20,2,30,31}. A vertical window 21 is stamped through the tens ring 2 to the right of the numerals 0, 1 and 2, to see the numbers (reference 10) carried by the ring of the units 1.

La date 3 affichée au travers du ou des guichets 60 dans le cadran correspond donc généralement à la combinaison d'une dizaine affichée par le mobile 2 et d'une unité imprimée sur le mobile 1 et vue à travers une fenêtre 21. Les quantièmes 20, 30 et 31, dans cet exemple, sont toutefois constitués chacun de deux chiffres imprimés sur le même mobile 2. Le mécanisme d'affichage de l'invention est donc une combinaison entre un mécanisme d'affichage de grande date, avec deux chiffres portés par deux mobiles distincts, et un mécanisme d'affichage de quantième conventionnel pour d'autres dates, pour lesquelles le chiffre unique ou les deux chiffres du quantième sont portés par le même mobile. On évite ainsi, au moins pour certaines dates, les inconvénients de l'affichage par deux mobiles distincts, sans devoir renoncer à l'affichage de quantièmes de grande taille.The date 3 displayed through the or wickets 60 in the dial therefore generally corresponds to the combination of a dozen displayed by the mobile 2 and a unit printed on the mobile 1 and seen through a window 21. The dates 20 30 and 31, in this example, each consist of two numbers printed on the same mobile 2. The display mechanism of the invention is therefore a combination between a large date display mechanism, with two digits carried by two distinct mobiles, and a conventional date display mechanism for other dates, for which the single digit or the two digits of the date are carried by the same mobile. This avoids, at least for some dates, the disadvantages of the display by two distinct mobiles, without having to give up the display of large dates.

Nous allons maintenant décrire à l'aide des figures 2, 4 et 5 le mécanisme d'entraînement des deux mobiles 1, 2, Dans cet exemple, les deux mobiles sont entraînés par le même moteur électromécanique ou mécanique (non représenté) et mis à l'heure par la même couronne; il serait cependant aussi possible d'entraîner et/ou de régler les deux mobiles par deux moteurs indépendants, ou par un seul moteur mais au travers de deux chaînes cinématiques distinctes.We will now describe using figures 2 , 4 and 5 In this example, the two mobiles are driven by the same electromechanical or mechanical motor (not shown) and set by the same crown; it would however also be possible to drive and / or adjust the two mobiles by two independent motors, or by a single motor but through two separate kinematic chains.

En se référant plus particulièrement à la figure 2, un pignon 44 actionné par le moteur non représenté entraîne une roue 46 sur l'axe de laquelle est monté un dispositif de cliquet 460 agencé de manière à provoquer la rotation, chaque jour, à minuit ou à un autre moment, de la denture interne 11 de l'anneau des unités 1. Dans cet exemple, l'anneau 1 est donc indexé chaque jour de 360/31 degrés afin d'effectuer un tour par mois de 31 jours. D'autres pas d'indexation sont possibles par exemple dans le cas d'un affichage perpétuel. Un sautoir 110 retient la denture interne 11.With particular reference to the figure 2 , a pinion 44 actuated by the not shown motor drives a wheel 46 on the axis of which is mounted a pawl device 460 arranged to cause rotation, each day, at midnight or at another time, the internal toothing 11 in the ring of units 1. In this example, Ring 1 is indexed every day by 360/31 degrees to perform one round per month of 31 days. Others not indexing are possible for example in the case of a perpetual display. A jumper 110 retains the internal toothing 11.

On pourrait aussi dans le cadre de cette invention imaginer des mécanismes dans lesquels le changement de date ne se fait pas à minuit, ainsi que des mécanismes dans lesquels le disque 1 effectue un tour durant une période différente de 31 jours.One could also within the scope of this invention imagine mechanisms in which the date change is not done at midnight, and mechanisms in which the disk 1 performs a lap for a period different from 31 days.

L'anneau des unités 1 comporte des dents, formées dans cet exemple par des butées d'entraînement 120, 121 constituées par des portions en saillies de l'anneau 1, ici des portions repliées par étampage. Plusieurs dents proches peuvent être constituées par une même portion repliée. Ces butées permettent d'indexer un élément d'engrenage 50, dans cet exemple une étoile à six dents inégales, ou branches, indexées de 60° à chaque contact avec les butées 120, 121. Les butées 120, 121 sont disposées radialement sur l'anneau 1 de façon à ce qu'une butée actionne l'étoile 50 à chaque fois qu'une rotation de l'anneau des dizaines 2 est désirée. Dans l'exemple illustré, l'anneau des unités 1 comporte 6 butées 120, 121 irrégulièrement espacées pour déplacer l'anneau des dizaines 6 fois par mois:

  • o Le 10 du mois, sous l'action de la dent 121-10, lors du passage de la dizaine 0 à la dizaine 1;
  • o Le 20, sous l'action de la dent 121-20, lors du passage de la dizaine 1 à la dizaine 2;
  • o Le 21, sous, l'action de la dent 121-21, lors du passage du 20 au 21;
  • o Le 30, sous l'action de la dent 121-30, lors du passage de la dizaine 2 au 30;
  • o Le 31, sous l'action de la dent 121-31, lors du passage du 30 au 31; et
  • o Le 1er, sous l'action de la dent plus courte 120, lors du passage du 31 à la dizaine 0.
The ring of the units 1 comprises teeth, formed in this example by drive stops 120, 121 constituted by portions projecting from the ring 1, here portions folded by stamping. Several close teeth may be constituted by the same folded portion. These stops make it possible to index a gear element 50, in this example a star with six unequal teeth, or branches, indexed by 60 ° at each contact with the stops 120, 121. The stops 120, 121 are arranged radially on the outside. ring 1 so that a stop activates the star 50 each time a rotation of the ring tens 2 is desired. In the illustrated example, the ring of the units 1 comprises 6 stops 120, 121 irregularly spaced to move the ring of tens 6 times per month:
  • o The 10th of the month, under the action of the tooth 121-10, during the passage of the ten 0 to the ten 1;
  • o The 20, under the action of the tooth 121-20, during the passage of the decade 1 to the decade 2;
  • o The 21, under, the action of tooth 121-21, during the passage of 20 to 21;
  • o The 30, under the action of the tooth 121-30, during the passage of the decade 2 to 30;
  • o The 31, under the action of the tooth 121-31, during the passage from 30 to 31; and
  • o The 1st , under the action of the shorter tooth 120, during the passage from the 31st to the tenth 0.

Le pas linéaire des dents 120,121 sur l'anneau des unités est donc irrégulier et différent du pas linéaire des dents de l'étoile 50; dans cet exemple, il manque des dents sur l'organe d'entraînement.The linear pitch of the teeth 120, 121 on the ring of the units is therefore irregular and different from the linear pitch of the teeth of the star 50; in this example, there are missing teeth on the drive member.

L'étoile 50 entraîne à chaque rotation une roue 52 montée sur le même axe, qui actionne à son tour une roue 53. La roue 53 est montée sur l'axe d'une roue 54 engrenant avec la denture interne 22 de l'anneau des dizaines 2. Le rapport d'engrenage entre les roues 50 et 53 est choisi de manière à ce que l'angle d'indexation de l'anneau des dizaines 2 provoqué par un déplacement de l'étoile 50 corresponde à la distance angulaire entre deux chiffres des dizaines.The star 50 drives at each rotation a wheel 52 mounted on the same axis, which in turn actuates a wheel 53. The wheel 53 is mounted on the axis of a wheel 54 meshing with the internal toothing 22 of the ring 2. The gear ratio between the wheels 50 and 53 is chosen so that the indexing angle of the tens ring 2 caused by a displacement of the star 50 corresponds to the angular distance between two digits tens.

L'étoile 50 est retenue par un sautoir 51 appuyé contre l'interstice 502 entre deux dents 501 de l'étoile 50 par un ressort 510. Le sautoir permet d'éviter que l'étoile 50 ne tourne librement, en particulier lorsqu'elle est entraînée par une dent 120, 121. La construction et le fonctionnement du sautoir sont décrits plus en détail plus bas en relation avec la figure 6.The star 50 is retained by a jumper 51 pressed against the gap 502 between two teeth 501 of the star 50 by a spring 510. The jumper prevents the star 50 from spinning freely, particularly when is driven by a tooth 120, 121. The construction and operation of the jumper are described in more detail below in connection with the figure 6 .

Comme on le voit en particulier sur la figure 4, le premier mobile 1 coulisse directement sur le pont supérieur 9 du mouvement de la montre, et est retenu par une première plaque 8 montée par-dessus ce pont. Le deuxième mobile 2 coulisse sur un chemin annulaire par-dessus cette première plaque 8 et est retenu par une deuxième plaque 7. Le cadran 6 est fixé par-dessus la deuxième plaque et muni d'un guichet 60 pour afficher les quantièmes portés par le premier et/ou le deuxième mobile.As we see in particular on the figure 4 , the first mobile 1 slides directly on the upper deck 9 of the movement of the watch, and is retained by a first plate 8 mounted over this bridge. The second mobile 2 slides on an annular path over this first plate 8 and is retained by a second plate 7. The dial 6 is fixed over the second plate and provided with a window 60 to display the dates carried by the first and / or second mobile.

Nous allons maintenant décrire à l'aide de la figure 6 le mécanisme de correction de la position angulaire relative des deux mobiles 1 et 2.We will now describe using the figure 6 the mechanism for correcting the relative angular position of the two mobiles 1 and 2.

Lors de chocs ou de remontages ou de mises à l'heure très énergiques, il peut arriver qu'une butée 120, 121, ou dent, de l'anneau des unités 1 entraîne l'étoile 50 avec une énergie telle qu'en dépit du sautoir 51 et de la goupille 511 l'étoile 50 soit indentée de plusieurs pas. Ce risque pourrait être limité, mais pas entièrement supprimé, en utilisant un ressort de sautoir plus fort pour appuyer sur les dents 50. Cette solution aurait toutefois l'inconvénient de nécessiter une puissance et une énergie importante, préjudicielle à la réserve de marche de la montre et au dimensionnement de ses organes moteurs.During shocks or pumping or setting very energetic time, it may happen that a stop 120, 121, or tooth, the ring of the units 1 drives the star 50 with such energy that despite of the jumper 51 and the pin 511 the star 50 is indented several steps. This risk could be limited, but not entirely eliminated, by using a stronger jumper spring to press the teeth 50. However, this solution would have the disadvantage of requiring a significant amount of power and energy, for a preliminary reason to the power reserve of the shows and the dimensioning of its motor organs.

Suite à un tel incident, la position angulaire relative de l'anneau des dizaines 2 est décalée par rapport à celle de l'anneau des unités 1. Par conséquent, les séquences d'unités parcourues ne correspondent plus-aux dizaines affichées en regard; le mouvement se met par exemple à parcourir des dates 31, 32, 33, 34 etc, ou à sauter directement du 1er au 11 du mois. Si aucun mécanisme de correction n'était prévu, il serait nécessaire pour remédier à cette situation fâcheuse de démonter le mouvement et de replacer manuellement l'étoile 50 dans la position angulaire désirée.Following such an incident, the relative angular position of the tens ring 2 is shifted relative to that of the ring of units 1. Consequently, the sequences of units traveled do not correspond to the tens displayed opposite; for example, the movement goes through dates 31, 32, 33, 34, etc., or jumps directly from the 1st to the 11th of the month. If no correction mechanism was provided, it would be necessary to remedy this unfortunate situation to disassemble the movement and manually replace the star 50 in the desired angular position.

Selon l'invention, les dents 120, 121 du mobile des unités ont des hauteurs h1, h2, et éventuellement des formes ou des positions différentes, comme on peut le voir plus particulièrement sur la figure 6. En particulier, la première dent (ou butée) 120 de l'anneau des unités est plus haute que les autres dents 121.According to the invention, the teeth 120, 121 of the mobile units have heights h1, h2, and possibly different shapes or positions, as can be seen more particularly on the figure 6 . In particular, the first tooth (or stop) 120 of the ring of units is higher than the other teeth 121.

En fait, dans l'exemple illustré, la taille des ergots 120 et 121 est éventuellement identique, mais leur distance au centre de l'anneau est différente. La hauteur h1, h2 des dents 120, 121 dépend donc du sommet de leur projection sur un plan parallèle à la platine du mouvement; une dent 120 est considérée comme haute parce qu'elle passe plus près du centre de l'étoile 50 que les dents 121.In fact, in the illustrated example, the size of the lugs 120 and 121 is possibly identical, but their distance to the center of the ring is different. The height h1, h2 of the teeth 120, 121 thus depends on the vertex of their projection on a plane parallel to the platen of the movement; a tooth 120 is considered high because it passes closer to the center of the star 50 than the teeth 121.

De la même façon, les dents de l'étoile 50 ont des hauteurs h3 et h4 et des formes variables, les dents 501 étant plus hautes que la dent 503.In the same way, the teeth of the star 50 have heights h3 and h4 and variable shapes, the teeth 501 being higher than the tooth 503.

Comme expliqué plus haut, les ergots 120, 121 sont placés dans l'exemple illustré à des distances irrégulières afin d'engrener l'étoile 50 seulement les jours où une indentation de l'anneau des dizaines est nécessaire. Le pas linéaire entre les ergots 120, 121 existants est en outre de préférence variable afin d'obtenir un angle de contact optimal entre n'importe quelle combinaison de dents 120 ou 121 et les portions 5012, 5013 des dents 501, 503. Les ergots 120, 121 ne sont donc pas placés à des positions angulaires séparées par des multiples du pas d'engrenage.As explained above, the lugs 120, 121 are placed in the illustrated example at irregular distances in order to mesh the star 50 only on days when an indentation of the tens ring is necessary. The linear pitch between the lugs 120, 121 existing is furthermore preferably variable in order to obtain an optimum contact angle between any combination of teeth 120 or 121 and the portions 5012, 5013 of the teeth 501, 503. The lugs 120, 121 are therefore not placed at angular positions separated by multiples of the gear pitch.

La hauteur h2 des dents courtes 121 ne leur permet pas d'engrener avec l'unique dent courte 503 de l'étoile 50. De cette façon, lorsque l'étoile 50 et l'anneau des dizaines 2 sont accidentellement incrémentés par un des ergots 121 de deux pas au lieu d'un seul, la dent courte 503 se retrouve face à un ergot court 121. Dans cette position non illustrée, l'étoile 50 n'est plus entraînée. L'anneau des dizaines 2 pourra uniquement être actionné lorsque, après un nombre d'incrémentations suffisant de l'anneau des unités, une haute dent 120 menante se retrouve en face de la dent menée 503. Cette disposition permet ainsi d'assurer que la dent courte 503 sera toujours entraînée par la longue dent 120 plutôt que par n'importe quelle autre dent 121. Il est ainsi possible de rétablir la position angulaire relative des deux organes 1 et 50, simplement en laissant tourner l'anneau des unités 1 suffisamment longtemps ou en le tournant manuellement au moyen de la tige de correction de date.The height h2 of the short teeth 121 does not allow them to mesh with the single short tooth 503 of the star 50. In this way, when the star 50 and the ring of the tens 2 are accidentally incremented by one of the lugs 121 of two not instead of one, the short tooth 503 is facing a short lug 121. In this position not shown, the star 50 is no longer driven. The tens ring 2 can only be actuated when, after a sufficient number of increments of the ring of the units, a high driving tooth 120 is found in front of the driven tooth 503. This arrangement thus makes it possible to ensure that the short tooth 503 will always be driven by the long tooth 120 rather than any other tooth 121. It is thus possible to restore the relative angular position of the two members 1 and 50, simply by letting the ring of the units 1 rotate sufficiently for a long time or by turning it manually using the date correction rod.

La figure 6 illustre également une variante préférentielle du sautoir 51 qui pivote autour d'un axe 512 et appuie au moyen d'un élément ressort 510 sur l'étoile 50. Selon l'invention, la forme du sautoir lui permet de s'appuyer en position de repos sur la face postérieure 5010 d'une dent de l'étoile 50 et sur la face antérieure 5011 d'une dent non adjacente; afin de limiter le frottement, le contact avec la dent intermédiaire 501 est nul ou en tout cas limité à une petite surface.The figure 6 also illustrates a preferred embodiment of the jumper 51 which pivots about an axis 512 and supports by means of a spring element 510 on the star 50. According to the invention, the shape of the jumper allows it to be supported in position resting on the posterior face 5010 of a tooth of the star 50 and on the anterior face 5011 of a non-adjacent tooth; in order to limit the friction, the contact with the intermediate tooth 501 is zero or in any case limited to a small surface.

L'appui sur la face postérieure 5010 permet d'empêcher que l'étoile ne tourne dans le sens opposé au sens désiré; l'appui sur la face antérieure 5011 permet de soulever le sautoir 51 lorsque l'étoile est entraînée en rotation par le disque des unités 1. Le sautoir s'appuie sur trois dents adjacentes, ou éventuellement sur deux dents non adjacentes même lorsqu'une ou plusieurs dents en regard du sautoir ont une hauteur plus courte.The support on the rear face 5010 makes it possible to prevent the star from rotating in the opposite direction to the desired direction; the support on the front face 5011 can raise the jumper 51 when the star is rotated by the disk of the units 1. The jumper leans on three adjacent teeth, or possibly on two non-adjacent teeth even when one or more teeth facing the jumper have a shorter height.

Dans la position d'indexation illustrée sur la figure 6, le sautoir 51 s'apprête à être soulevé par la portion antérieure 5011 de la dernière dent en contact avec le sautoir. Toutefois, dans la position d'indexation précédente, cette dernière dent est une dent courte 503; dans ce cas la forme de la face antérieure 5031 de cette dent ne lui permet pas de soulever le sautoir 51, qui est alors soulevé par la face antérieure 5014 de la dent intermédiaire appuyant sur la portion 513 du sautoir.In the indexing position illustrated on the figure 6 , the jumper 51 is ready to be lifted by the anterior portion 5011 of the last tooth in contact with the jumper. However, in the previous indexing position, the latter tooth is a short tooth 503; in this case the shape of the anterior face 5031 of this tooth does not allow him to lift the jumper 51, which is then raised by the front face 5014 of the intermediate tooth pressing the portion 513 of the jumper.

Une goupille 511 perpendiculaire au plan du sautoir et de la platine du mouvement se déplace dans une coulisse 500 (représentée sur les figures 2, 5 et 6) usinée dans la roue 52, dont la forme empêche la goupille 511 de sauter directement d'un interstice 502 à un interstice non adjacent entre deux dents de l'étoile 50. La coulisse 500 épouse donc approximativement les contours de l'étoile 50 afin de forcer la goupille 511, et donc le sautoir 51, à se déplacer jusqu'au fond de l'interstice 502 entre deux dents. On limite ainsi le risque que l'étoile 50 soit incrémentée de deux crans lorsqu'elle est actionnée par les dents 120, 121 de l'anneau des unités 1.A pin 511 perpendicular to the plane of the jumper and the plate of the movement moves in a slide 500 (shown in FIGS. figures 2 , 5 and 6 ) machined in the wheel 52, whose shape prevents the pin 511 from jumping directly from a gap 502 to a non-adjacent gap between two teeth of the star 50. The slider 500 therefore approximately matches the contours of the star 50 so forcing the pin 511, and thus the jumper 51, to move to the bottom of the gap 502 between two teeth. This limits the risk that the star 50 is incremented by two notches when it is actuated by the teeth 120, 121 of the ring of the units 1.

Les exemples décrits ci-dessus concernent des engrenages avec des organes entraînés et entraînants comportant chacun deux hauteurs de dents distinctes; l'invention n'est toutefois pas limitée à cet exemple, et l'homme du métier comprendra les avantages pouvant être obtenus avec des organes d'engrenage comprenant plus de deux hauteurs de dents. Par exemple, on pourrait utiliser trois hauteurs de dents sur chaque roue avec différentes possibilités d'engrènement mutuelles.The examples described above relate to gears with driven and driving members each having two distinct tooth heights; the invention is however not limited to this example, and the skilled person will understand the advantages that can be obtained with gear members comprising more than two heights of teeth. For example, one could use three heights of teeth on each wheel with different possibilities of mutual meshing.

Claims (26)

  1. Gear for watch movement, including:
    a driving organ (1),
    a driven organ (50),
    characterized in that said driving organ (1) is provided with z1 first teeth (120) and z2 second teeth (121), the height and/or position of the second teeth (121) being lower than the height of the first teeth (120),
    and in that said driven organ (50) is provided with z3 third teeth (501) and z4 fourth teeth (503), the height and/or position of the third teeth (501) being greater than the height of the fourth teeth (503),
    the z1 first teeth (120) allowing the z3 third teeth (501) as well as the z4 fourth teeth (503) to be driven,
    the z2 second teeth (121) allowing however only the z3 third teeth (501) but not the z4 fourth teeth (503) to be driven.
  2. Gear for watch movement according to claim 1, wherein said driving organ (1) is a rotating organ.
  3. Gear for watch movement according to one of the claims 1 or 2, said driving organ being a wheel.
  4. Gear for watch movement according to one of the claims 2 or 3, said driving organ actuating a temporal phase indicator.
  5. Gear for watch movement according to claim 4, said driving organ being a day of the month display mobile (1).
  6. Gear according to one of the claims 1 to 5, wherein said driving organ actuates a first mobile (1) bearing at least certain units' digits (10) of the days of the month,
    a second mobile (2) bearing at least certain tens' digits (20) of the days of the months,
    said mobiles (1, 2) being arranged and placed so that, for at least certain dates, the day of the month (3) displayed to the user corresponds to the combination of units' digits borne by the first mobile (1) and of tens' digits borne by the second mobile (2).
  7. Gear for watch movement according to one of the claims 1 to 6, said first and second teeth (120, 121) or said third and fourth teeth being constituted by portions protruding perpendicularly to the plane of said mobile (1), the height, position and/or shape of said first teeth (120) being different from the height, position and/or shape of said second teeth (121).
  8. Gear for watch movement according to one of the claims 1 to 7, said first and second teeth (120, 121) or said second and third teeth being constituted by portions protruding perpendicularly to the plane of said gear organs (12, 50), the distance between said protruding portions and the center of the corresponding gear organ being variable so as to produce the effect of teeth of variable height.
  9. Gear for watch movement according to one of the claims 1 to 8, wherein said driven organ (50) is a rotating organ.
  10. Gear for watch movement according to claim 9, said driven organ being a star wheel (50).
  11. Gear for watch movement according to one of the claims 1 to 10, said driven organ actuating a temporal phase indicator.
  12. Gear according to claim 11, said driven organ being mounted on the same axis as a driving wheel (52) of a day of the month display mobile (2).
  13. Gear for watch movement according to one of the claims 1 to 12, wherein said driving organ (12) and said driven organ (50) are both rotating organs, said heights (h1, h2, h3, h4) of the teeth (120, 121, 501, 503) being determined so that, after a certain number of indexing steps, each of the teeth of at least one of said organs (50) always gears with the same tooth of the other of said organs (12).
  14. Gear for watch movement according to one of the claims 1 to 13, wherein said tooth heights (h1, h2, h3, h4) being determined so that, after a certain number of indexing steps, each of said third and fourth teeth (501, 503) of the driven organ (50) is always driven by the same first or second tooth (120, 121) of the driving organ (12).
  15. Gear for watch movement according to one of the claims 1 to 14, wherein said tooth heights (h1, h2, h3, h4) are determined so that, after a certain number of indexing steps, each of said first and second teeth (120, 121) of the driving organ (1) always drives the same third or fourth tooth (501, 503) of the driven organ (50).
  16. Gear for watch movement according to one of the claims 1 to 15, wherein said driving organ (1) and said driven organ (50) are both rotating organs, said tooth heights (h1, h2, h3, h4) being determined so that the relative angular positions of these two organs remain constant at each revolution.
  17. Gear for watch movement according to one of the claims 1 to 16, wherein the number of first and third teeth z1 and z3 are both equal to 1.
  18. Gear for watch movement according to one of the claims 1 to 17 wherein the numbers of second and fourth teeth z2 and z4 are both equal to 1.
  19. Gear for watch movement according to one of the claims 1 to 17, wherein one of said gear organs (50) is held by a jumper (51) acting one said teeth (501, 503), said jumper being placed so as to prevent the undesirable rotation of said gear organ (50), a banking element (511) being arranged so as to prevent said jumper from passing directly from one tooth of said gear element to a non adjacent tooth.
  20. Gear according to claim 19, wherein said banking element (511) is linked to said jumper and moves in a slide way (500) made so as to force said jumper (51) to move close to the bottom of the interstice (502) between two said teeth (501, 503).
  21. Gear according to one of the claims 19 to 20, wherein said jumper (51) presses in resting position on the rear side (5010) of a tooth (501) and on the front side (5011) of another, non-adjacent tooth (501).
  22. Gear according to claim 21, wherein an intermediary tooth lifts said jumper during rotation of said gear organ.
  23. Gear according to one of the claims 1 to 22, wherein the linear pitch of the teeth on the two said organs is different.
  24. Gear according to one of the claims 1 to 22, wherein the pitch of the teeth (120, 121) on at least one of said two organs (1) is irregular.
  25. Gear for watch movement according to one of the claims 1 to 24, wherein said driving organ (1) actuates a first mobile bearing a first sequence of digits,
    said driven organ actuating a second mobile (2) bearing a second sequence of digits,
    said mobiles (1, 2) being arranged and placed so that, at least for certain dates, a day of the month (3) displayed to the user corresponds to the combination of indications (10, 20) borne by the first mobile (1) and of indications borne by the second mobile (2).
  26. Gear according to claim 25, wherein said mobiles (1, 2) are arranged and placed so that, for at least another date, the day of the month (3) displayed to the user corresponds to the combination of two digits or of one digit and at least one space borne by the same mobile (1).
EP04766040A 2003-06-23 2004-06-07 Cog system for watch action Active EP1636656B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH01094/03A CH700720B1 (en) 2003-06-23 2003-06-23 Gear for watch movement and date display mechanism provided with such a gear.
PCT/EP2004/051053 WO2004114027A2 (en) 2003-06-23 2004-06-07 Cog system for watch action

Publications (2)

Publication Number Publication Date
EP1636656A2 EP1636656A2 (en) 2006-03-22
EP1636656B1 true EP1636656B1 (en) 2008-05-21

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EP04766040A Active EP1636656B1 (en) 2003-06-23 2004-06-07 Cog system for watch action

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US (1) US7366058B2 (en)
EP (1) EP1636656B1 (en)
JP (1) JP4603539B2 (en)
CN (1) CN100480900C (en)
AT (1) ATE396433T1 (en)
CH (1) CH700720B1 (en)
DE (1) DE602004013968D1 (en)
ES (1) ES2305828T3 (en)
HK (1) HK1087792A1 (en)
WO (1) WO2004114027A2 (en)

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ES2305828T3 (en) 2008-11-01
US20060098535A1 (en) 2006-05-11
JP4603539B2 (en) 2010-12-22
WO2004114027A2 (en) 2004-12-29
JP2009513931A (en) 2009-04-02
EP1636656A2 (en) 2006-03-22
CN1754134A (en) 2006-03-29
DE602004013968D1 (en) 2008-07-03
WO2004114027A3 (en) 2005-05-19
ATE396433T1 (en) 2008-06-15
CH700720B1 (en) 2010-10-15
HK1087792A1 (en) 2006-10-20
US7366058B2 (en) 2008-04-29
CN100480900C (en) 2009-04-22

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