EP0029204B1 - Mécanisme de positionnement d'une roue de centre - Google Patents

Mécanisme de positionnement d'une roue de centre Download PDF

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Publication number
EP0029204B1
EP0029204B1 EP80106960A EP80106960A EP0029204B1 EP 0029204 B1 EP0029204 B1 EP 0029204B1 EP 80106960 A EP80106960 A EP 80106960A EP 80106960 A EP80106960 A EP 80106960A EP 0029204 B1 EP0029204 B1 EP 0029204B1
Authority
EP
European Patent Office
Prior art keywords
wheel
pinion
center wheel
center
friction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP80106960A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0029204A1 (fr
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
Societe Suisse pour lIindustrie Horlogere Management Services 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 Societe Suisse pour lIindustrie Horlogere Management Services SA filed Critical Societe Suisse pour lIindustrie Horlogere Management Services SA
Publication of EP0029204A1 publication Critical patent/EP0029204A1/fr
Application granted granted Critical
Publication of EP0029204B1 publication Critical patent/EP0029204B1/fr
Expired 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
    • 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 on the one hand to a mechanism for positioning a center wheel in an electronic timepiece with analog display comprising a jumper, the first end of which is terminated by two inclined planes cooperating with the teeth of the center wheel and whose second end is rotatably mounted with fatty friction on the plate, and on the other hand a method of positioning a center wheel using this mechanism.
  • 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 in order to position the second hand with precision with respect to the indexes carried on the dial. Precise positioning of the hand relative 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 correctly positioned relative to the index, which can represent a guarantee as to the good quality of the watch.
  • the positioning of the jumping seconds or minute hands with respect 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 circle of the mobile and 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 carries either 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 bend the end of the blade to form a triangle, the two inclined planes cooperating with the teeth.
  • the other end of the jumper 1 is fixed on a ferrule 5 which can pivot frictionally about an axis 6 itself secured to a stud 7. in this stud are made two oblong holes 8 and 9.
  • the hole 8 receives a circular group 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 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.
  • 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 center wheel integral 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 not show the timer formed by the gears 21, 22, 23 and 24 which is not necessary to understanding the invention.
  • the mobile 29 is composed of a pinion 17 meshing on the center wheel 4 and a wheel 16 frictionally mounted with respect to said pinion 17.
  • Figure 3 shows how the wheel 16 is made.
  • a classic 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.
  • 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 in relation to its tigeron and finally in relation to the pinion which is one with it.
  • Figure 2 also shows that the upper part of the tigeron 18 includes an overhang 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 description above which explains a preferred embodiment of the mobile 29.
  • the wheel 16 may comprise for example six rays 33 distributed around 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 considerably simplified since it is no longer necessary to provide the stud 7, the pin 10 and the screw 11 shown in FIG. 1.
  • center wheel which carries the minute hand 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.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
EP80106960A 1979-11-16 1980-11-12 Mécanisme de positionnement d'une roue de centre Expired EP0029204B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7928761A FR2469743A1 (fr) 1979-11-16 1979-11-16 Mecanisme de positionnement d'une roue de centre pour piece d'horlogerie
FR7928761 1979-11-16

Publications (2)

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

Family

ID=9231962

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80106960A Expired EP0029204B1 (fr) 1979-11-16 1980-11-12 Mécanisme de positionnement d'une roue de centre

Country Status (5)

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

Families Citing this family (8)

* 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 (ja) * 1989-01-09 1997-02-05 ナイルス部品株式会社 スイッチの極盤及びその製造装置
DE102007042797B4 (de) * 2007-09-07 2010-04-08 Lange Uhren Gmbh Uhr
CH700752B1 (fr) * 2009-04-15 2014-03-14 Patek Philippe Sa Geneve Mécanisme de chronographe et pièce d'horlogerie munie d'un tel mécanisme.
JP2011053019A (ja) * 2009-08-31 2011-03-17 Seiko Instruments Inc スリップ歯車構造体及びこれを備えた時計
EP2560057B1 (fr) * 2011-08-17 2014-04-02 ETA SA Manufacture Horlogère Suisse Mouvement d'horlogerie à hauteur réduite et à grande réserve de marche
US9678477B2 (en) * 2014-09-12 2017-06-13 Seiko Instruments Inc. Mechanical component, mechanical component manufacturing method, movement, and timepiece
EP3825779A1 (fr) * 2019-11-21 2021-05-26 ETA SA Manufacture Horlogère Suisse Composant mobile d'horlogerie avec element maintenu par friction

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH312742A (fr) * 1953-10-08 1956-02-29 Ebauches Sa Pièce d'horlogerie avec mécanisme de seconde instantanée
DE1698624B1 (de) * 1964-01-21 1969-09-04 United States Time Corp Zeigerwerksanordnung fuer elektrische Uhren
US3487633A (en) * 1968-01-23 1970-01-06 Us Time Corp The Dial train friction device
DE1932285A1 (de) * 1969-06-26 1971-01-07 Kieninger & Obergfell Radialfriktion fuer feinmechanische Getriebeanordnungen,insbesondere Uhrwerke
JPS4917670Y1 (ja) * 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
JPS5263461U (ja) * 1975-11-04 1977-05-11

Also Published As

Publication number Publication date
JPS6133473B2 (ja) 1986-08-02
US4408898A (en) 1983-10-11
DE3063990D1 (en) 1983-08-04
JPS56124077A (en) 1981-09-29
FR2469743B1 (ja) 1982-09-17
EP0029204A1 (fr) 1981-05-27
FR2469743A1 (fr) 1981-05-22

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