EP0029204A1 - Mechanism for positioning a centre wheel - Google Patents

Mechanism for positioning a centre wheel Download PDF

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Publication number
EP0029204A1
EP0029204A1 EP80106960A EP80106960A EP0029204A1 EP 0029204 A1 EP0029204 A1 EP 0029204A1 EP 80106960 A EP80106960 A EP 80106960A EP 80106960 A EP80106960 A EP 80106960A EP 0029204 A1 EP0029204 A1 EP 0029204A1
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EP
European Patent Office
Prior art keywords
wheel
pinion
center wheel
positioning
center
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.)
Granted
Application number
EP80106960A
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German (de)
French (fr)
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EP0029204B1 (en
Inventor
Cyril Vuilleumier
Bruno Erni
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.)
SSIH Management Services SA
Original Assignee
SSIH Management Services SA
Societe Suisse pour lIindustrie Horlogere Management Services SA
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Publication of EP0029204A1 publication Critical patent/EP0029204A1/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
    • G04B35/00—Adjusting the gear train, e.g. the backlash of the arbors, depth of meshing of the gears
    • 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
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B19/00—Indicating the time by visual means
    • G04B19/02—Back-gearing arrangements between gear train and hands

Definitions

  • the present invention relates to a mechanism for positioning a center wheel in an electronic timepiece with analog display comprising a jumper, the first end set of which ends in two inclined planes cooperating with the toothing of the center wheel and the second of which end is rotatably mounted with greasy friction on the plate.
  • Such a mechanism is known from the prior art and is found to be applied in certain chronographs or in certain electronic watches with analog display with the aim of accurately positioning the seconds treble with respect to the indexes carried on the dial.
  • Precise positioning of the hand in relation to the index finger is even more desirable in electronic watches comprising an hour hand and a minute hand only and where the minute hand, driven by a stepping motor, advances one division per minute. It will be understood that in this case the eye has plenty of time to judge whether the hand is well positioned relative to the index, which can represent a guarantee as to the good quality of the watch.
  • the positioning of the jumping second or minute hands pa relative to the indexes of a dial depends on the play existing in the gear train which is located between the motor axis and the center wheel which carries the needle, the round of the mobiles and the regularity with which the divisions of the dial are marked.
  • a positioning jumper is generally used which acts directly on the teeth of the center wheel which is worn either by the minute hand or the second hand. In this way, the angular pitch of the needle is found to be strictly the same as that of the toothing of the wheel.
  • FIG. 1 shows a mechanism for positioning a center wheel according to the prior art.
  • This mechanism comprises a jumper 1 constituted by an elastic blade, the first end of which carries a ruby polyhedron 2 which cooperates with the toothing 3 of the center wheel 4. It is more simply possible to fold the end, emitted from the blade, to form a triangle whose two inclined planes cooperate with the teeth.
  • the other end of the jumper 1 is fixed on a 5 which can pivot frictionally about an axis 6 itself in solidarity with a stud 7. In this stud feels two oblong holes
  • the hole 8 receives a circular pin 10 fixed to the plate and the hole 9, a screw 11 screwed into the plate.
  • the center wheel is driven by the pinion 12 of an intermediate wheel 13 which meshes with the pinion 14 of a stepping motor.
  • FIG. 2 shows the cog train intended to drive the minute and hour hands of a timepiece.
  • the pinion 14 drives a mobile 29 composed of a wheel 16 and a pinion 17.
  • the central wheel solid with the axis 19 carrying the minute hand meshes on the pinion 17.
  • the axis 20 of the hour hand is rotated by the gear train composed of the pinion 21 secured to the center wheel 4 and the timer formed by the gears 22, 23 and 24.
  • the wheel 24 is formed in one piece with the axis 20 carrying the hour hand.
  • the axes of the various mobiles are rotatably mounted in bearings 25 and 26 driven into the plate 27 and the bridge 28 of the timepiece.
  • Figure 3 is a plan view of the same mechanism along the dotted line AA shown in Figure 2.
  • Figure 3 does does not represent the timer formed by the gears 21, 22, 23 and 24 which is not necessary for understanding the invention.
  • the mobile 29 is composed of a pinion 17 meshing with the center wheel 4 and a wheel 16 mounted with friction with respect to the said pinion 17.
  • FIG. 3 shows how the wheel 16 is made.
  • it is perforated in its center by stamping two circular parts 30 and two rectilinear parts 31 leading to a central circular recess 32.
  • This produces a wheel with four spokes 33 which connect its periphery to its center .
  • the diameter of said recess 32 is chosen slightly smaller than the diameter of the tigeron 18 (FIG. 2) of the mobile 29 so that when the wheel is inserted on the tigeron there is fatty friction on the one hand relative to the other.
  • FIG. 2 also shows that the upper part of the tigeron 18 comprises ur protrusion 34 which prevents the wheel 16 from coming out of its housing.
  • a good seat to the wheel 16 is ensured by practicing in the pinion 17 a circular groove 35.
  • the invention is not limited to the above description which explains a preferred embodiment of the mobile 29.
  • the wheel 16 may for example include six rays 33 distributed over the circumference. It can also be openwork; in this case, an elastic washer is superimposed on it which, retained by the protrusion 34, provides the requested friction.
  • FIGS. 2 and 3 show that the toothing 3 of the center wheel 4 cooperates with a jumper 1, one of the ends of which is terminated by a ruby polyhedron 2.
  • the other end of the jumper is secured to a ferrule 5 which is mounted with fatty friction on an axis 6 fixed to the plate as can be seen in FIG. 3.
  • this construction is notably simplified since it is no longer necessary to provide the stud 7, the pin 10 and the screw 11 shown in FIG. 1.
  • the invention can naturally also be applied to a center wheel which carries the second hand.
  • the invention relates above all to an electronic timepiece comprising a stepping motor, but could be extended to a mechanical chronograph watch to position the second hand.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)

Abstract

Mécanisme de positionnement d'une roue de centre dans une pièce d'horlogerie permettant de positionner avec précision l'aiguille des secondes ou des minutes par rapport aux divisions du cadran. Il comprend un sautoir (1) monté à frottement gras sur la platine et coopérant avec la denture (3) de la roue de centre (4) et un mobile (29) intercalé entre la roue de centre (4) et le pignon moteur (14). Ce mobile comprend un pignon (17) engrenant sur la roue de centre et une roue (16) montée à frlction par rapport audit pignon et engrenent sur le pignon moteur. La méthode de positionnement consiste à immobiliser le pignon moteur puis à faire tourner la roue de centre pour faire coïncider l'extrémité du sautoir avec un vide de la denture. L'invention peut être utilisée pour positionner avec exactitude l'aiguille des secondes ou des minutes d'une pièce d'horlogerie électronique équipée d'un moteur pas à pas.Mechanism for positioning a center wheel in a timepiece allowing precise positioning of the second or minute hand in relation to the divisions of the dial. It includes a jumper (1) mounted with greasy friction on the plate and cooperating with the toothing (3) of the center wheel (4) and a mobile (29) interposed between the center wheel (4) and the drive pinion ( 14). This mobile comprises a pinion (17) meshing on the center wheel and a wheel (16) mounted with friction relative to said pinion and mesh on the motor pinion. The positioning method consists of immobilizing the drive pinion and then turning the center wheel to make the end of the jumper coincide with a gap in the teeth. The invention can be used to precisely position the second or minute hand of an electronic timepiece equipped with a stepping motor.

Description

La présente invention concerne un mécanisme de positionnement d'une roue de centre dans une pièce d'horlogerie électronique à affichage analogique comprenant un sautoir dont la première extrémite set terminée par deux plans inclinés coopérant avec la denture de la roue de centre et dont la seconde extrémité est montée rotative nent à frottement gras sur la pla tine.The present invention relates to a mechanism for positioning a center wheel in an electronic timepiece with analog display comprising a jumper, the first end set of which ends in two inclined planes cooperating with the toothing of the center wheel and the second of which end is rotatably mounted with greasy friction on the plate.

Un tel mécanisme est connu de l'art antérieur et on trouve son appl- cation dans certains chronographes ou dans certaines montres électroniques à affichage analogique dans le but de positionner avec exactitude l'aigui le des secondes par rapport aux index portés sur le cadran. Un positionne ment précis ce l'aiguille par rapport à l'index est encore plus souhaitable dans les montres électroniques comprenant une aiguille des heures et une aiguille des minutes seulement et où l'aiguille des minutes, entraînée par un moteur pas à pas,progresse d'une division par minute. On comprendra que dans ce cas l'oeil a tout le temps de juger si l'aiguille est bien positior née par rapport a l'index, ce qui peut représenter une garantie quant à la bienfacture de la montre.Such a mechanism is known from the prior art and is found to be applied in certain chronographs or in certain electronic watches with analog display with the aim of accurately positioning the seconds treble with respect to the indexes carried on the dial. Precise positioning of the hand in relation to the index finger is even more desirable in electronic watches comprising an hour hand and a minute hand only and where the minute hand, driven by a stepping motor, advances one division per minute. It will be understood that in this case the eye has plenty of time to judge whether the hand is well positioned relative to the index, which can represent a guarantee as to the good quality of the watch.

Le positionnement des aiguilles sautantes de seconde ou de minute pa rapport aux index d'un cadran dépend des jeux existant dans le train d'er- grenages qui se trouve entre l'axe moteur et la roue de centre qui porte l'aiguille, du rond des mobiles et de la régularité avec laquelle sontmar- quées les divisions du cadran. Pour ne plus dépendre des deux premiers phénomènes cités, on utilise généralement un sautoir de positionnement qui agit directement sur la denture de la roue de centre que porte soitl'aiguille des minutes, soit l'aiguille des secondes. De cette façon, le pas angulaire de l'aiguille se trouve être rigoureusement le même que celui de la denture de la roue.The positioning of the jumping second or minute hands pa relative to the indexes of a dial depends on the play existing in the gear train which is located between the motor axis and the center wheel which carries the needle, the round of the mobiles and the regularity with which the divisions of the dial are marked. To no longer depend on the first two phenomena mentioned, a positioning jumper is generally used which acts directly on the teeth of the center wheel which is worn either by the minute hand or the second hand. In this way, the angular pitch of the needle is found to be strictly the same as that of the toothing of the wheel.

La figure 1 montre un mécanisme de positionnement d'une roue de centre selon l'art antérieur. Ce mécanisme comprend un sautoir 1 constitué parune lame élastique dont la première extrémité porte un polyèdre en rubis 2 qui coopère avec la denture 3 de la roue de centre 4. On peut plus simplement plier l'ext,émité de la lame pour former un triangle dont les deux plans inclinès cooperent avec la denture. L'autre extrémité du sautoir 1 est fixée sur une

Figure imgb0001
5 qui peut pivoter à friction autour d'un axe 6 lui-même so- lidaire d'un plot 7. Dans ce plot sent pratiqués deux trous oblongs
Figure imgb0002
Le trou 8 reçoit une goupille circulaire 10 fixée à la platine et le trou 9, une vis 11 vissée dans la platine. La roue de centre est entraînée par le pignon 12 d'une roue intermédiaire 13 qui engrène sur le pignon 14 d'un moteur pas à pas. Pour régler le sautoir de positionnement, il faut d'abord faire tourner la virole jusqu'à ce que le rubis 2 entre en contact avec la roue 4 puis faire glisser le plot 7 dans l'axe du sautoir 1 de telle sorte que les plans inclinés du rubis appuyent entre les pointes des deux dents consécutives de la denture 3, l'ébat d'engrenage étant réparti par moitié de chaque côté. Une fois le réglage terminé, on serre la vis 11. Ces opérations sont délicates et les moyens mis en oeuvre sont trop grossiers pour assurer un positionnement précis. Souvent il faut répéterlamanoeuvre plusieurs fois car une opération peut influencer l'autre.FIG. 1 shows a mechanism for positioning a center wheel according to the prior art. This mechanism comprises a jumper 1 constituted by an elastic blade, the first end of which carries a ruby polyhedron 2 which cooperates with the toothing 3 of the center wheel 4. It is more simply possible to fold the end, emitted from the blade, to form a triangle whose two inclined planes cooperate with the teeth. The other end of the jumper 1 is fixed on a
Figure imgb0001
5 which can pivot frictionally about an axis 6 itself in solidarity with a stud 7. In this stud feels two oblong holes
Figure imgb0002
The hole 8 receives a circular pin 10 fixed to the plate and the hole 9, a screw 11 screwed into the plate. The center wheel is driven by the pinion 12 of an intermediate wheel 13 which meshes with the pinion 14 of a stepping motor. To adjust the positioning jumper, you must first rotate the ferrule until the ruby 2 comes into contact with the wheel 4 then slide the stud 7 in the axis of the jumper 1 so that the planes inclined rubies press between the tips of the two consecutive teeth of the teeth 3, the gear gap being divided by half on each side. Once the adjustment is completed, the screw 11 is tightened. These operations are delicate and the means used are too coarse to ensure precise positioning. Often it is necessary to repeat the work several times because one operation can influence the other.

C'est le but de la présente invention de remédier à ces inconvénients en proposant un mécanisme de positionnement de la roue de centre qui soit d'un réglage facile, précis, tout en apportant une simplification de la construction.It is the object of the present invention to remedy these drawbacks by proposing a positioning mechanism for the center wheel which is of an easy, precise adjustment, while bringing a simplification of the construction.

Ces buts sont atteints par les moyens revendiqués.These aims are achieved by the means claimed.

Un exemple de réalisation de l'invention sera décrit maintenant à la lumière du dessin dans lequel :

  • La figure 1 est une vue en plan d'un mécanisme de positionnementde la roue de centre selon l'art antérieur tel qu'il a été expliqué ci-dessus.
  • La figure 2 est une coupe du mécanisme de positionnement de la roue de centre selon l'invention.
  • La figure 3 est une vue en plan simplifiée du même mécanisme suivant la ligne pointillée AA portée sur la figure 2.
An embodiment of the invention will now be described in the light of the drawing in which:
  • Figure 1 is a plan view of a positioning mechanism of the center wheel according to the prior art as explained above.
  • Figure 2 is a section of the positioning mechanism of the center wheel according to the invention.
  • FIG. 3 is a simplified plan view of the same mechanism along the dotted line AA shown in FIG. 2.

La figure 2 montre le rouage destiné à entraîner les aiguilles de minute et d'heure d'une pièce d'horlogerie. Solidairedu rotor aimanté 15 d'un moteur pas à pas, le pignon 14 entraîne un mobile 29 composé d'une roue 16 et d'un pignon 17. La roue de centre solidairede l'axe 19 portant l'aiguille des minutes engrène sur le pignon 17. L'axe 20 de l'aiguille des heures est entraîné en rotation par le train d'engrenages composé du pignon 21 solidaire de la roue de centre 4 et de la minuterie formée parles engrenages 22, 23 et 24. La roue 24 est formée d'une pièce avec l'axe 20 portant l'aiguille des heures. Les axes des divers mobiles sont montés rotativement dans des paliers 25 et 26 chassés dans la platine 27 et le pont 28 de la pièce d'horlogerie.FIG. 2 shows the cog train intended to drive the minute and hour hands of a timepiece. Solid with the magnetic rotor 15 of a stepping motor, the pinion 14 drives a mobile 29 composed of a wheel 16 and a pinion 17. The central wheel solid with the axis 19 carrying the minute hand meshes on the pinion 17. The axis 20 of the hour hand is rotated by the gear train composed of the pinion 21 secured to the center wheel 4 and the timer formed by the gears 22, 23 and 24. The wheel 24 is formed in one piece with the axis 20 carrying the hour hand. The axes of the various mobiles are rotatably mounted in bearings 25 and 26 driven into the plate 27 and the bridge 28 of the timepiece.

La figure 3 est une vue en plan du même mécanisme suivant la ligne pointillée AA portée sur la figure 2. Par simplification, la figure 3 ne représente pas la minuterie formée des engrenages 21, 22, 23 et 24 qui n'est pas nécessaire à la compréhension de l'invention.Figure 3 is a plan view of the same mechanism along the dotted line AA shown in Figure 2. For simplicity, Figure 3 does does not represent the timer formed by the gears 21, 22, 23 and 24 which is not necessary for understanding the invention.

Selon l'invention, le mobile 29 est composé d'un pignon 17 engrenant sur la roue de centre 4 et d'une roue 16 montée à friction par rapport aj- dit pignon 17. La figure 3 montre comment est réalisée la roue 16. En plus d'une denture classique, elle est ajourée en son centre par étampage de deux parties circulaires 30 et de deux parties rectilignes 31 aboutissant un évidement circulaire central 32. On réalise ainsi une roue à quatre rayons 33 qui relient sa périphérie à son centre. Le diamètre dudit évidement 32 est choisi légèrement plus petit que le diamètre du tigeron 18 (figure 2) du mobile 29 de telle façon que lorsque la roue est introduite sur le tigeron il y ait frottement gras de l'une part rapport àl'autre. Le couple de friction est choisi, d'une part, suffisamment grand pour qu'en fonctionnement normal de la montre la transmission du mouvement se fasse sans glissement et, d'autre part, suffisamment faible pour que lors d'un réglage manuel on puisse faire glisser angulairement la roue par rapport à son tigeron et finalement par rapport au pignon qui fait corps avec lui, La figure 2 montre encore que la partie supérieure du tigeron 18 comprend ur dépassement 34 qui empêche la roue 16 de sortir de son logement. Une bonne assise à la roue 16 est assurée en pratiquant dans le pignon 17 une gorge circulaire 35. L'invention n'est pas limité à la description ci-dessus qui explique une exécution préférée du mobile 29. La roue 16 peut comporter par exemple six rayons 33 répartis sur la circonférence. Elle peut aussi être non ajourée; dans ce cas, on lui superpose une rondelle élastique qui, retenue par le dépassement 34, assure la friction demandée.According to the invention, the mobile 29 is composed of a pinion 17 meshing with the center wheel 4 and a wheel 16 mounted with friction with respect to the said pinion 17. FIG. 3 shows how the wheel 16 is made. In addition to a conventional toothing, it is perforated in its center by stamping two circular parts 30 and two rectilinear parts 31 leading to a central circular recess 32. This produces a wheel with four spokes 33 which connect its periphery to its center . The diameter of said recess 32 is chosen slightly smaller than the diameter of the tigeron 18 (FIG. 2) of the mobile 29 so that when the wheel is inserted on the tigeron there is fatty friction on the one hand relative to the other. The friction torque is chosen, on the one hand, sufficiently large so that in normal operation of the watch the transmission of the movement takes place without slipping and, on the other hand, sufficiently low so that during manual adjustment it is possible to angularly slide the wheel relative to its tigeron and finally relative to the pinion which is integral with it, FIG. 2 also shows that the upper part of the tigeron 18 comprises ur protrusion 34 which prevents the wheel 16 from coming out of its housing. A good seat to the wheel 16 is ensured by practicing in the pinion 17 a circular groove 35. The invention is not limited to the above description which explains a preferred embodiment of the mobile 29. The wheel 16 may for example include six rays 33 distributed over the circumference. It can also be openwork; in this case, an elastic washer is superimposed on it which, retained by the protrusion 34, provides the requested friction.

Comme cela a été expliqué à propos de la figure 1, les figures 2 et 3 montrent que la denture 3 de la roue de centre 4 coopère avec un sautoir 1 dont l'une des extrémités est terminée par un polyèdre en rubis 2. L'autre extrémité du sautoir est solidaire d'une virole 5 qui est montée à frottement gras sur un axe 6 fixé à la platine comme on peut le voir sur la figure 3. Par rapport à l'art antérieur, cette construction est notablement simplifiée puisqu'il n'est plus nécessaire de prévoir le plot 7, la goupille 10 et la vis 11 représentés à la figure 1.As explained in connection with FIG. 1, FIGS. 2 and 3 show that the toothing 3 of the center wheel 4 cooperates with a jumper 1, one of the ends of which is terminated by a ruby polyhedron 2. The other end of the jumper is secured to a ferrule 5 which is mounted with fatty friction on an axis 6 fixed to the plate as can be seen in FIG. 3. Compared to the prior art, this construction is notably simplified since it is no longer necessary to provide the stud 7, the pin 10 and the screw 11 shown in FIG. 1.

On va expliquer maintenant comment on opère le positionnement de la roue de centre. On fait tourner d'abord la virole 5 sur sa goupille 6 de façon à faire entrer en contact le rubis 2 avec la denture 3 de la roue de centre 4 (figure 3). Ensuite, par une ouverture (non représentée) dans le pont 28 (figure 2), on fait tourner, au moyen d'un outil, la roue de centre 4 de telle sorte que les plans inclinés du rubis 2 appuyent entre les pointes de deux dents consécutives de la denture 3. Pendant cette seconde opération, on prendra soin de bloquer le pignon moteur 14, ce qui immobilisera la roue 16, à moins que l'ensemble pignon 14 et roue 16 constitue déjà un système de transmission à sens unique de marche comme le décrit la demande de brevet FR 79-05 930. Dans ces conditions, comme cela a été décrit plus haut, le pignon 17 glissera par rapport à la roue 16 immobilisée. Ainsi, on a positionné avec précision la roue de centre qui porte l'aiguille des minutes et, partant, ladite aiguille se trouvera toujours, lors de sa progression pas à pas, en correspondance exacte avec les divisions du cadran.We will now explain how we operate the positioning of the center wheel. First, the ferrule 5 is rotated on its pin 6 so as to bring the ruby 2 into contact with the toothing 3 of the center wheel 4 (FIG. 3). Then, through an opening (not shown) in bridge 28 (Figure 2), the center wheel 4 is rotated by means of a tool so that the inclined planes of the ruby 2 press between the points of two consecutive teeth of the toothing 3. During this second operation, we take care to block the motor pinion 14, which will immobilize the wheel 16, unless the pinion 14 and wheel 16 assembly already constitutes a one-way transmission system as described in patent application FR 79-05 930 Under these conditions, as described above, the pinion 17 will slide relative to the immobilized wheel 16. Thus, the center wheel which carries the minute hand has been precisely positioned and, therefore, said hand will always be, during its step-by-step progression, in exact correspondence with the divisions of the dial.

La description mentionne une roue de centre qui porte l'aiguille des minutes. L'invention peut naturellement s'appliquer aussi à une roue de centre qui porte l'aiguille des secondes. L'invention concerne avant tout une pièce d'horlogerie électronique comportant un moteur pas à pas, mais pourrait être étendue à une montre chronographe mécanique pour positionner l'aiguille des secondes.The description mentions a center wheel which carries the minute hand. The invention can naturally also be applied to a center wheel which carries the second hand. The invention relates above all to an electronic timepiece comprising a stepping motor, but could be extended to a mechanical chronograph watch to position the second hand.

Claims (6)

1. Mécanisme de positionnement d'une roue de centre (4) dans une pièce d'horlogerie électronique à affichage analogique comprenant un sautoir (1) dont la première extrémité est terminée par deux plans inclinés (2) coopérant avec la denture (3) de ladite roue de centre et dontlaseconde extrémité est montée rotativement à frottement gras sur la platine, caractérisé par le fait qu'un moteur pas à pas entraîne ladite roue de centre par l'intermédiaire d'un train d'engrenages, ledit train d'engrenages comprenant au moins un mobile (29) composé d'un pignon (17) et d'une roue montée à friction (16) par rapport audit pignon (17).1. Mechanism for positioning a center wheel (4) in an electronic timepiece with analog display comprising a jumper (1) the first end of which is terminated by two inclined planes (2) cooperating with the teeth (3) of said center wheel and the second end of which is rotatably mounted with fatty friction on the plate, characterized in that a stepping motor drives said center wheel by means of a gear train, said train gears comprising at least one mobile (29) composed of a pinion (17) and a frictionally mounted wheel (16) relative to said pinion (17). 2. Mécanisme de positionnement selon la revendication 1, caractérisé par le fait que ledit pignon (17) engrène sur ladite roue de centre (4) et que ladite roue montée à friction (16) engrène sur un pignon (14) solidaire de l'axe du moteur.2. Positioning mechanism according to claim 1, characterized in that said pinion (17) meshes with said center wheel (4) and that said frictionally mounted wheel (16) meshes with a pinion (14) integral with the motor axis. 3. Mécanisme de positionnement selon la revendication 1 ou la revendication 2, caractérisé par le fait que la roue de centre (4) porte l'aiguille des secondes.3. Positioning mechanism according to claim 1 or claim 2, characterized in that the center wheel (4) carries the second hand. 4. Mécanisme de positionnement selon la revendication 1 ou larevendi- cation 2, caractérisé par le fait que la roue de centre (4) porte l'aiguille des minutes.4. Positioning mechanism according to claim 1 or claim 2, characterized in that the center wheel (4) carries the minute hand. 5. Mécanisme de positionnement selon la revendication 1, caractérisé par le fait que ladite roue montée à friction (16) par rapport audit pignon (17) comporte en son centre un ressort de friction (33) découpé à même ladite roue, ledit ressort étant couplé élastiquement au tigeron (18) dudit pignon (17).5. Positioning mechanism according to claim 1, characterized in that said friction-mounted wheel (16) relative to said pinion (17) has in its center a friction spring (33) cut out of said wheel, said spring being elastically coupled to the tigeron (18) of said pinion (17). 6. Méthode de positionnement d'une roue de centre utilisant leméca- nisme selon la revendication 1 ou la revendication 2, caractérisée par le fait qu'elle comprend la succession des opérations suivantes : - appuyer les deux dits plans inclinés ( 2 ) sur la denture (3) de la roue de centre (4) en tournant ladite seconde extrémité du sautoir (5); - immobiliser le pignon (14) solidaire de l'axe du moteur; - déplacer angulairement la roue de centre en faisant patiner ledit pignon (17) qui engrène sur elle par rapport à ladite roue montée à friction (16) jusqu'à ce que lesdeux dits plans inclinés (2) du sautoir appuyent entre les points de deux dents consécutives de ladite roue de centre (4). 6. Method for positioning a center wheel using the mechanism according to claim 1 or claim 2, characterized in that it comprises the succession of the following operations: - press the two said inclined planes (2) on the teeth (3) of the center wheel (4) by turning said second end of the jumper (5); - immobilize the pinion (14) secured to the motor shaft; - angularly move the center wheel by making said pinion (17) slip which meshes with it relative to said friction mounted wheel (16) until the two said inclined planes (2) of the jumper press between the points of two consecutive teeth of said center wheel (4).
EP80106960A 1979-11-16 1980-11-12 Mechanism for positioning a centre wheel Expired EP0029204B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7928761A FR2469743A1 (en) 1979-11-16 1979-11-16 POSITIONING MECHANISM OF A CENTER WHEEL FOR A WATCHMAKING PART
FR7928761 1979-11-16

Publications (2)

Publication Number Publication Date
EP0029204A1 true EP0029204A1 (en) 1981-05-27
EP0029204B1 EP0029204B1 (en) 1983-06-29

Family

ID=9231962

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80106960A Expired EP0029204B1 (en) 1979-11-16 1980-11-12 Mechanism for positioning a centre wheel

Country Status (5)

Country Link
US (1) US4408898A (en)
EP (1) EP0029204B1 (en)
JP (1) JPS56124077A (en)
DE (1) DE3063990D1 (en)
FR (1) FR2469743A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2034374A2 (en) 2007-09-07 2009-03-11 Lange Uhren GmbH Clock
EP2241945A3 (en) * 2009-04-15 2016-12-21 Patek Philippe SA Genève Chronograph mechanism and timepiece equipped with such mechanism

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4974989A (en) * 1983-08-22 1990-12-04 Larry Salter Method for reducing installation forces and costs in a tapered bolt installation
JP2579209B2 (en) * 1989-01-09 1997-02-05 ナイルス部品株式会社 Switch pole plate and its manufacturing apparatus
JP2011053019A (en) * 2009-08-31 2011-03-17 Seiko Instruments Inc Slip gear structure and timepiece with the same
EP2560057B1 (en) * 2011-08-17 2014-04-02 ETA SA Manufacture Horlogère Suisse Timepiece movement with reduced height and large power reserve
US9678477B2 (en) * 2014-09-12 2017-06-13 Seiko Instruments Inc. Mechanical component, mechanical component manufacturing method, movement, and timepiece
EP3825779A1 (en) * 2019-11-21 2021-05-26 ETA SA Manufacture Horlogère Suisse Timepiece mobile component with element supported by friction

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1421043A (en) * 1964-01-21 1965-12-10 United States Time Corp Timer train for watch
DE1932285A1 (en) * 1969-06-26 1971-01-07 Kieninger & Obergfell Radial friction for fine mechanical gear assemblies, especially clockworks
DE2647634A1 (en) * 1975-11-04 1977-05-05 Seiko Instr & Electronics Seconds mechanism for quartz oscillator timepiece - has retaining spring engaging end of seconds shaft and fixed by screw to upper mounting plate

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH312742A (en) * 1953-10-08 1956-02-29 Ebauches Sa Timepiece with instantaneous seconds mechanism
US3487633A (en) * 1968-01-23 1970-01-06 Us Time Corp The Dial train friction device
JPS4917670Y1 (en) * 1969-09-25 1974-05-08
GB1343223A (en) * 1971-02-17 1974-01-10 Suwa Seikosha Kk Detent apparatus eg for use in an electronic timepiece

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1421043A (en) * 1964-01-21 1965-12-10 United States Time Corp Timer train for watch
DE1932285A1 (en) * 1969-06-26 1971-01-07 Kieninger & Obergfell Radial friction for fine mechanical gear assemblies, especially clockworks
DE2647634A1 (en) * 1975-11-04 1977-05-05 Seiko Instr & Electronics Seconds mechanism for quartz oscillator timepiece - has retaining spring engaging end of seconds shaft and fixed by screw to upper mounting plate

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2034374A2 (en) 2007-09-07 2009-03-11 Lange Uhren GmbH Clock
EP2034374A3 (en) * 2007-09-07 2009-07-15 Lange Uhren GmbH Clock
US8038340B2 (en) 2007-09-07 2011-10-18 Lange Uhren Gmbh Timepiece
EP2241945A3 (en) * 2009-04-15 2016-12-21 Patek Philippe SA Genève Chronograph mechanism and timepiece equipped with such mechanism

Also Published As

Publication number Publication date
FR2469743A1 (en) 1981-05-22
US4408898A (en) 1983-10-11
FR2469743B1 (en) 1982-09-17
EP0029204B1 (en) 1983-06-29
DE3063990D1 (en) 1983-08-04
JPS56124077A (en) 1981-09-29
JPS6133473B2 (en) 1986-08-02

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