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EP0067791A1 - Wheel staff for a time piece - Google Patents

Wheel staff for a time piece Download PDF

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Publication number
EP0067791A1
EP0067791A1 EP82810212A EP82810212A EP0067791A1 EP 0067791 A1 EP0067791 A1 EP 0067791A1 EP 82810212 A EP82810212 A EP 82810212A EP 82810212 A EP82810212 A EP 82810212A EP 0067791 A1 EP0067791 A1 EP 0067791A1
Authority
EP
European Patent Office
Prior art keywords
pivot
diameter
shaft
rotor
extension
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.)
Ceased
Application number
EP82810212A
Other languages
German (de)
French (fr)
Inventor
Ali Schneiter
Peter Bachmann
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.)
Ebauches Bettlach SA
Original Assignee
Ebauches Bettlach SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ebauches Bettlach SA filed Critical Ebauches Bettlach SA
Publication of EP0067791A1 publication Critical patent/EP0067791A1/en
Ceased legal-status Critical Current

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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
    • G04B13/00—Gearwork
    • G04B13/02—Wheels; Pinions; Spindles; Pivots

Definitions

  • the mobiles intended for use in timepieces include a shaft and a pinion generally produced in one piece.
  • the shaft also carries a toothed wheel, generally riveted to the pinion.
  • the shaft of the mobile constituting the rotor of this motor carries a permanent magnet.
  • Figure 1 shows such a rotor by way of nonlimiting example of a mobile of a timepiece.
  • the reference 1 designates the rotor shaft, the reference 2 the pinion, and the reference 3 the permanent magnet, generally annular and fixed to the shaft 1 by means of a support 4 which can also be made in one piece with the shaft 1 and the pinion 2.
  • the shaft 1 has at its ends two coaxial pivots 5 and 6 of diameter smaller than that of the shaft itself. These pivots 5 and 6 are engaged in holes 7 and 8 of a plate 9 and a bridge 10. The axial movement of the rotor is limited by the bearings 11 and 12.
  • the stator 13 of the stepping motor is mounted on the plate 9 so as to surround the permanent magnet 3.
  • the other moving parts forming the gear train of the timepiece are mounted in a similar manner between the plate 9 and the bridge 10.
  • this operation is done by bringing the bridge into contact with the ends of the pivots, and by moving it slightly in several directions, until all the pivots engage in their hole. During this engagement, it is possible that the edge of the hole cuts on the pivot a small chip of material which remains attached to the pivot and which engages in the hole. This chip can prevent, or at least seriously disturb, the rotation of the mobile. Even if no shavings are formed during this operation, the pressure exerted by the bridge on the end of the pivots can deform them, which also has the effect of preventing or disturbing the rotation of the _mobile.
  • the pivots of all mobiles are exposed to these dangers, but more particularly the pivot of the rotor shaft in electronic watches with stepping motor.
  • the permanent magnet 3 is in fact attracted by the stator 13 when this rotor is placed on the plate, and it is practically impossible to maintain the axis of the rotor in a direction perpendicular to the plate.
  • pivots intended to engage in the holes of the plate, or the plate itself can also be exposed to the dangers exposed above during the installation of the mobiles on this plate.
  • An object of the present invention is to provide a mobile shaft for a timepiece by which the above dangers are eliminated.
  • the mobile shaft for a timepiece comprises at least one cylindrical extension coaxial with one of its pivots and of diameter smaller than this, and at least a part frustoconical also coaxial with this first pivot and connecting this extension to this first pivot.
  • Figure 2 shows the rotor of the stepping motor of an electronic timepiece. This rotor is shown by way of nonlimiting example of a timepiece mobile.
  • FIGS. 1 and 2 The difference between FIGS. 1 and 2 resides in the fact that, in this FIG. 2, the shaft 1 of the rotor has a cylindrical extension 14 coaxial with the pivot 6. This cylindrical extension 14 has a diameter less than the diameter of the pivot 6. L the shaft 1 further comprises a frustoconical part 15 which connects the pivot 6 to the extension 14. The diameter of this frustoconical part 15 regularly decreases from the diameter of the pivot 6 to the diameter of the extension 14.
  • this cylindrical extension 14 When the bridge 10 is put in place, the end of this cylindrical extension 14 easily engages in the hole 8, because of its smaller diameter than that of the hole 8, even if the rotor is not perfectly perpendicular to the plate. In addition, if the edge of the hole 8 rubs against this cylindrical extension 14, the chip which is possibly formed is broken when this edge meets the truncated cone 15 and does not remain in the hole 8. There is no risk that '' another chip is formed by the friction of the edge of the hole 8 against this frustoconical part 15 or against the pivot 6. The engagement of the cylindrical extension 14 in the hole 8 in fact causes the straightening of the rotor which is thus practically found perpendicular to the plate when the edge of the hole 8 reaches the height of the start of the frustoconical part 15.
  • a second cylindrical extension designated by 16 in FIG. 2, can be provided at the other end of the shaft 1, with a diameter smaller than that of the pivot 5.
  • This extension 16 is connected to the pivot 5 by a second frustoconical part 17 whose diameter decreases regularly from the diameter of the pivot 5 to the diameter of the extension 16.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

The pivot (6) of the staff (1) comprises a cylindrical extension (14) which is connected to it by means of a frustoconical portion (15). The risk of damage to the pivot (6) during assembly of the bridge (10) is thus eliminated. <IMAGE>

Description

Les mobiles destinés à être utilisés dans les pièces d'horlogerie comportent un arbre et un pignon généralement fabriqués en une seule pièce. Lorsque le mobile fait partie du train d'engrenages entraînant les aiguilles, l'arbre porte en outre une roue dentée, généralement rivée au pignon. Dans les montres électroniques munies d'un moteur pas-à-pas, l'arbre du mobile constituant le rotor de ce moteur porte un aimant permanent.The mobiles intended for use in timepieces include a shaft and a pinion generally produced in one piece. When the mobile is part of the gear train driving the needles, the shaft also carries a toothed wheel, generally riveted to the pinion. In electronic watches fitted with a stepping motor, the shaft of the mobile constituting the rotor of this motor carries a permanent magnet.

La figure 1 montre un tel rotor à titre d'exemple non limitatif d'un mobile d'une pièce d'horlogerie.Figure 1 shows such a rotor by way of nonlimiting example of a mobile of a timepiece.

Dans cette figure 1, la référence 1 désigne l'arbre du rotor, la référence 2 le pignon, et la référence 3 l'aimant permanent, généralement annulaire et fixé à l'arbre 1 par l'intermédiaire d'un support 4 qui peut également être fabriqué d'une pièce avec l'arbre 1 et le pignon 2.In this figure 1, the reference 1 designates the rotor shaft, the reference 2 the pinion, and the reference 3 the permanent magnet, generally annular and fixed to the shaft 1 by means of a support 4 which can also be made in one piece with the shaft 1 and the pinion 2.

L'arbre 1 comporte à ses extrémités deux pivots coaxiaux 5 et 6 de diamètre inférieur à celui de l'arbre proprement dit. Ces pivots 5 et 6 sont engagés dans des trous 7 et 8 d'une platine 9 et d'un pont 10. Le déplacement axial du rotor est limité par les portées 11 et 12. Le stator 13 du moteur pas-à-pas est monté sur la platine 9 de manière à entourer l'aimant permanent 3.The shaft 1 has at its ends two coaxial pivots 5 and 6 of diameter smaller than that of the shaft itself. These pivots 5 and 6 are engaged in holes 7 and 8 of a plate 9 and a bridge 10. The axial movement of the rotor is limited by the bearings 11 and 12. The stator 13 of the stepping motor is mounted on the plate 9 so as to surround the permanent magnet 3.

Les autres mobiles formant le train d'engrenages de la pièce d'horlogerie, non représentés à la figure 1, sont montés de manière analogue entre la platine 9 et le pont 10.The other moving parts forming the gear train of the timepiece, not shown in FIG. 1, are mounted in a similar manner between the plate 9 and the bridge 10.

Lors de l'assemblage des différents constituants de la pièce d'horlogerie, tous les mobiles sont d'abord placés aux endroits voulus sur la platine 9, avec un de leurs pivots engagé dans le trou correspondant. Le pont 10 est ensuite présenté devant les autres pivots et mis en place de manière que ces pivots s'engagent dans les trous prévus à cet effet. Le diamètre de ces trous n'étant que très légèrement supérieur au diamètre des pivots, cette opération est assez délicate à réaliser.During the assembly of the various components of the timepiece, all the mobiles are first placed at the desired locations on the plate 9, with one of their pivots engaged in the corresponding hole. The bridge 10 is then presented in front of the other pivots and put in place so that these pivots engage in the holes provided for this purpose. The diameter of these holes being only slightly greater than the diameter of the pivots, this operation is quite delicate to perform.

En pratique, cette opération se fait en amenant le pont en contact avec les extrémités des pivots, et en le déplaçant légèrement dans plusieurs sens, jusqu'à ce que tous les pivots s'engagent dans leur trou. Lors de cet engagement, il est possible que l'arête du trou découpe sur le pivot un petit copeau de matière qui reste attaché au pivot et qui s'engage dans le trou. Ce copeau peut empêcher, ou au moins sérieusement perturber, la rotation du mobile. Même si aucun copeau n'est formé pendant cette opération, la pression exercée par le pont sur l'extrémité des pivots peut déformer ceux-ci, ce qui a également pour effet d'empêcher ou de perturber la rotation du _mobile.In practice, this operation is done by bringing the bridge into contact with the ends of the pivots, and by moving it slightly in several directions, until all the pivots engage in their hole. During this engagement, it is possible that the edge of the hole cuts on the pivot a small chip of material which remains attached to the pivot and which engages in the hole. This chip can prevent, or at least seriously disturb, the rotation of the mobile. Even if no shavings are formed during this operation, the pressure exerted by the bridge on the end of the pivots can deform them, which also has the effect of preventing or disturbing the rotation of the _mobile.

Ces dangers sont particulièrement grands lorsque l'arbre du mobile est réalisé en une matière plastique et que le pont est métallique, par exemple en laiton.These dangers are particularly great when the mobile shaft is made of a plastic material and the bridge is metallic, for example brass.

Lorsque l'arbre du mobile est en acier et que le pont est en laiton, il peut arriver pendant cette opération d'assemblage que l'extrémité du pivot repousse une petite quantité de matière du pont dans le trou, ce qui perturbe ou empêche également la rotation du mobile.When the mobile shaft is made of steel and the bridge is made of brass, it can happen during this assembly operation that the end of the pivot pushes a small amount of material from the bridge into the hole, which also disturbs or prevents the rotation of the mobile.

Les pivots de tous les mobiles sont exposés à ces dangers, mais plus particulièrement le pivot de l'arbre du rotor dans les montres électroniques à moteur pas-à-pas. L'aimant permanent 3 est en effet attiré par le stator 13 lorsque ce rotor est mis en place sur la platine, et il est pratiquement impossible de maintenir l'axe du rotor dans une direction perpendiculaire à la platine.The pivots of all mobiles are exposed to these dangers, but more particularly the pivot of the rotor shaft in electronic watches with stepping motor. The permanent magnet 3 is in fact attracted by the stator 13 when this rotor is placed on the plate, and it is practically impossible to maintain the axis of the rotor in a direction perpendicular to the plate.

Il faut relever que les pivots destinés à s'engager dans les trous de la platine, ou la platine elle-même, peuvent également être exposés aux dangers exposés ci-dessus pendant la mise en place des mobiles sur cette platine.It should be noted that the pivots intended to engage in the holes of the plate, or the plate itself, can also be exposed to the dangers exposed above during the installation of the mobiles on this plate.

Un but de la présente invention est de proposer un arbre de mobile pour pièce d'horlogerie grâce auquel les dangers ci-dessus sont éliminés.An object of the present invention is to provide a mobile shaft for a timepiece by which the above dangers are eliminated.

Ce but est atteint par le fait que l'arbre de mobile pour pièce d'horlogerie selon l'invention comporte au moins un prolongement cylindrique coaxial à l'un de ses pivots et de diamètre inférieur à celui-ci, et au moins une partie tronconique également coaxiale à ce premier pivot et reliant ce prolongement à ce premier pivot.This object is achieved by the fact that the mobile shaft for a timepiece according to the invention comprises at least one cylindrical extension coaxial with one of its pivots and of diameter smaller than this, and at least a part frustoconical also coaxial with this first pivot and connecting this extension to this first pivot.

La présente invention va être décrite à l'aide du dessin dans lequel :

  • - la figure 1, déjà citée, représente un rotor dont l'arbre a une forme connue, et
  • - la figure 2 représente un rotor comprenant un arbre selon l'invention.
The present invention will be described using the drawing in which:
  • FIG. 1, already cited, represents a rotor whose shaft has a known shape, and
  • - Figure 2 shows a rotor comprising a shaft according to the invention.

La figure 2 montre le rotor du moteur pas-à-pas d'une pièce d'horlogerie électronique. Ce rotor est montré à titre d'exemple non limitatif d'un mobile de pièce d'horlogerie.Figure 2 shows the rotor of the stepping motor of an electronic timepiece. This rotor is shown by way of nonlimiting example of a timepiece mobile.

Les éléments 1 à 13 du rotor de la figure 2 se retrouvent dans la figure 1 et ne seront pas décrits à nouveau.The elements 1 to 13 of the rotor of Figure 2 are found in Figure 1 and will not be described again.

La différence entre les figures 1 et 2 réside dans le fait que, dans cette figure 2, l'arbre 1 du rotor comporte un prolongement cylindrique 14 coaxial au pivot 6. Ce prolongement cylindrique 14 a un diamètre inférieur au diamètre du pivot 6. L'arbre 1 comporte en outre une partie tronconique 15 qui relie le pivot 6 au prolongement 14. Le diamètre de cette partie tronconique 15 diminue régulièrement du diamètre du pivot 6 au diamètre du prolongement 14.The difference between FIGS. 1 and 2 resides in the fact that, in this FIG. 2, the shaft 1 of the rotor has a cylindrical extension 14 coaxial with the pivot 6. This cylindrical extension 14 has a diameter less than the diameter of the pivot 6. L the shaft 1 further comprises a frustoconical part 15 which connects the pivot 6 to the extension 14. The diameter of this frustoconical part 15 regularly decreases from the diameter of the pivot 6 to the diameter of the extension 14.

Lors de la mise en place du pont 10, l'extrémité de ce prolongement cylindrique 14 s'engage facilement dans le trou 8, à cause de son diamètre plus faible que celui du trou 8, et cela même si le rotor n'est pas parfaitement perpendiculaire à la platine. En outre, si l'arête du trou 8 frotte contre ce prolongement cylindrique 14, le copeau qui est éventuellement formé est cassé lorsque cette arête rencontre le tronc de cône 15 et ne reste pas dans le trou 8. Il n'existe aucun risque qu'un autre copeau soit formé par le frottement de l'arête du trou 8 contre cette partie tronconique 15 ou contre le pivot 6. L'engagement du prolongement cylindrique 14 dans le trou 8 provoque en effet le redressement du rotor qui se trouve ainsi pratiquement perpendiculaire à la platine lorsque l'arête du trou 8 parvient à la hauteur du début de la partie tronconique 15.When the bridge 10 is put in place, the end of this cylindrical extension 14 easily engages in the hole 8, because of its smaller diameter than that of the hole 8, even if the rotor is not perfectly perpendicular to the plate. In addition, if the edge of the hole 8 rubs against this cylindrical extension 14, the chip which is possibly formed is broken when this edge meets the truncated cone 15 and does not remain in the hole 8. There is no risk that '' another chip is formed by the friction of the edge of the hole 8 against this frustoconical part 15 or against the pivot 6. The engagement of the cylindrical extension 14 in the hole 8 in fact causes the straightening of the rotor which is thus practically found perpendicular to the plate when the edge of the hole 8 reaches the height of the start of the frustoconical part 15.

Pour faciliter le montage du rotor dans la platine 9, un deuxième prolongement cylindrique, désigné par 16 à la figure 2, peut être prévu à l'autre extrémité de l'arbre 1, avec un diamètre inférieur à celui du pivot 5. Ce prolongement 16 est relié au pivot 5 par une seconde partie tronconique 17 dont le diamètre diminue régulièrement du diamètre du pivot 5 au diamètre du prolongement 16.To facilitate mounting of the rotor in the plate 9, a second cylindrical extension, designated by 16 in FIG. 2, can be provided at the other end of the shaft 1, with a diameter smaller than that of the pivot 5. This extension 16 is connected to the pivot 5 by a second frustoconical part 17 whose diameter decreases regularly from the diameter of the pivot 5 to the diameter of the extension 16.

Il est évidemment possible de prévoir des arrangements analogues à l'une des extrémités, ou aux deux, de l'arbre des autres mobiles composant le train d'engrenages de la pièce d'horlogerie, avec les mêmes avantages que ceux qui ont été décrits ci-dessus.It is obviously possible to provide similar arrangements at one or both ends of the shaft of the other mobiles making up the gear train of the timepiece, with the same advantages as those which have been described. above.

Un avantage supplémentaire de l'invention découle du fait qu'il est possible de donner à chaque prolongement cylindrique des arbres de ces mobiles situés du côté du pont une longueur différente. Cette disposition permet d'engager ces prolongements cylindriques les uns après les autres dans les trous du pont en commençant par le plus long, ce qui facilite encore la mise en place du pont.An additional advantage of the invention follows from the fact that it is possible to give each cylindrical extension of the shafts of these mobiles situated on the bridge side a different length. This arrangement makes it possible to engage these cylindrical extensions one after the other in the holes of the bridge, starting with the longest, which further facilitates the positioning of the bridge.

Il est évident que l'invention n'est pas limitée à l'exemple décrit dans lequel le mobile est monté entre une platine et un pont, mais qu'elle s'applique également aux cas où le mobile est monté entre deux ponts ou entre deux autres pièces quelconques.It is obvious that the invention is not limited to the example described in which the mobile is mounted between a plate and a bridge, but that it also applies to cases where the mobile is mounted between two bridges or between any other two pieces.

Claims (2)

1. Arbre d'un mobile pour pièce d'horlogerie comportant un premier et un second pivot coaxiaux, caractérisé par le fait qu'il comporte en outre un prolongement cylindrique (14) coaxial audit premier pivot (6) et de diamètre inférieur à celui-ci, et une partie tronconique (15) également coaxiale audit premier pivot (6) pour relier ledit prolongement (14) audit premier pivot (6), le diamètre de ladite partie tronconique (15) diminuant régulièrement du diamètre dudit premier pivot (6) au diamètre dudit prolongement (14).1. Shaft of a mobile for a timepiece comprising a first and a second coaxial pivot, characterized in that it further comprises a cylindrical extension (14) coaxial with said first pivot (6) and of diameter smaller than that -this, and a frustoconical part (15) also coaxial with said first pivot (6) for connecting said extension (14) to said first pivot (6), the diameter of said frustoconical part (15) regularly decreasing in diameter of said first pivot (6 ) the diameter of said extension (14). 2. Arbre d'un mobile selon la revendication 1, caractérisé par le fait qu'il comporte un second prolongement cylindrique (16) coaxial audit second pivot (5) et de diamètre inférieur à celui-ci, et une seconde partie tronconique (17) également coaxiale audit second pivot (5) pour relier ledit second prolongement (16) audit second pivot (5), le diamètre de ladite seconde partie tronconique (17) diminuant régulièrement du diamètre dudit second pivot (5) au diamètre dudit second prolongement (16).2. Shaft of a mobile according to claim 1, characterized in that it comprises a second cylindrical extension (16) coaxial with said second pivot (5) and of diameter smaller than this, and a second frustoconical part (17 ) also coaxial with said second pivot (5) to connect said second extension (16) to said second pivot (5), the diameter of said second frustoconical part (17) regularly decreasing from the diameter of said second pivot (5) to the diameter of said second extension ( 16).
EP82810212A 1981-06-12 1982-05-19 Wheel staff for a time piece Ceased EP0067791A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH387081 1981-06-12
CH3870/81 1981-06-12

Publications (1)

Publication Number Publication Date
EP0067791A1 true EP0067791A1 (en) 1982-12-22

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ID=4265254

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82810212A Ceased EP0067791A1 (en) 1981-06-12 1982-05-19 Wheel staff for a time piece

Country Status (2)

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EP (1) EP0067791A1 (en)
JP (1) JPS585688A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH247761A (en) * 1944-10-04 1947-03-31 Rattermann Henry Jr Clock.
FR2312053A1 (en) * 1975-05-23 1976-12-17 Seikosha Kk AXIS SUPPORT DEVICE
US4249251A (en) * 1979-10-29 1981-02-03 Timex Corporation Gear train for timepiece with a stepping motor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH247761A (en) * 1944-10-04 1947-03-31 Rattermann Henry Jr Clock.
FR2312053A1 (en) * 1975-05-23 1976-12-17 Seikosha Kk AXIS SUPPORT DEVICE
US4249251A (en) * 1979-10-29 1981-02-03 Timex Corporation Gear train for timepiece with a stepping motor

Also Published As

Publication number Publication date
JPS585688A (en) 1983-01-13

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