US3818692A - Drive mechanism for two coaxial calendar members in watch movement - Google Patents

Drive mechanism for two coaxial calendar members in watch movement Download PDF

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Publication number
US3818692A
US3818692A US00400140A US40014073A US3818692A US 3818692 A US3818692 A US 3818692A US 00400140 A US00400140 A US 00400140A US 40014073 A US40014073 A US 40014073A US 3818692 A US3818692 A US 3818692A
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US
United States
Prior art keywords
drive member
lever
calendar
cam
members
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Expired - Lifetime
Application number
US00400140A
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English (en)
Inventor
A Bron
R Zaugg
K Schaller
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A Schild SA
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A Schild SA
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Publication date
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Publication of US3818692A publication Critical patent/US3818692A/en
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B19/00—Indicating the time by visual means
    • G04B19/24—Clocks or watches with date or week-day indicators, i.e. calendar clocks or watches; Clockwork calendars
    • G04B19/243—Clocks or watches with date or week-day indicators, i.e. calendar clocks or watches; Clockwork calendars characterised by the shape of the date indicator
    • G04B19/247—Clocks or watches with date or week-day indicators, i.e. calendar clocks or watches; Clockwork calendars characterised by the shape of the date indicator disc-shaped
    • G04B19/253—Driving or releasing mechanisms
    • G04B19/25333—Driving or releasing mechanisms wherein the date indicators are driven or released mechanically by a clockwork movement
    • G04B19/25373—Driving or releasing mechanisms wherein the date indicators are driven or released mechanically by a clockwork movement driven or released stepwise by an energy source which is released at determined moments by the clockwork movement
    • G04B19/25386—Driving or releasing mechanisms wherein the date indicators are driven or released mechanically by a clockwork movement driven or released stepwise by an energy source which is released at determined moments by the clockwork movement manually corrected at the end of months having less than 31 days

Definitions

  • ABSTRACT A drive mechanism for two coaxial calendar members meant to rotate in stepwise manner about their common axis in a watch movement, comprising a drive member provided with two finger-pieces for actuating one of each of the calendar members, a calendar wheel connected to the gear-train and coaxial with the drive member, a coupling with angular play between the calendar wheel and the drive member, a cam rigidly connected to the drive member, a lever operating in concert with the cam, and a spring acting on the lever such that it will ensure an instantaneous jump of the two calendar members by rotation of the drive members after the latter has been brought into a given orientation by the calendar wheel.
  • the invention is further characterized in that the contour of the cam is provided with a retaining notch operating in concert with the lever and limiting the rotation of the drive member under the influence of the spring.
  • the purpose of the present invention is to create a drive mechanism for wrist-watches provided with coaxial date and day indicating members. Such a mechanism shall ensure instantaneous commutation of those members, each advancing by one step, so that an excessive jump by two steps can be avoided.
  • Another purpose of the invention consists in achieving a mechanism by means of a simple and compact construction.
  • the invention also aims to add the feasibility of effecting a date correction the moment the jump has oc curred without thereby running the risk of blocking the movement.
  • the object of the invention is a drive mechanism for two coaxial calendar members meant to rotate in stepwise manner about their common axis in a watch movement, comprising a drive member provided with two finger-pieces for actuating one of each of the calendar members, a calendar wheel connected to the gear-train and coaxial with the drive member, a coupling with angular play between the calendar wheel and the drive member, a cam rigidly connected to the drive member, a lever operating in concert with the cam, and a spring acting on the lever such that it will ensure an instantaneous jump of the two calendar members by rotation of the drive members after the latter has been brought into a given orientation by the calendar wheel.
  • the invention is further characterized in that the contour of the cam is provided with a retaining notch operating in concert with the lever and limiting the rotation of the drive member under the influence of the spring.
  • FIG. I is a top view, certain parts having been removed
  • FIG. 2 is a plan view from the bottom of the assembly plate, with cam and commutation lever;
  • FIG. 3 is a section along line Il II of FIG. 1.
  • a bottom plate 1 supports a date or crown ring 2 and an hour-wheel 3 ensures the pivoting of a day-star 4 provided with a display disc 5 extending at the same level as crown 2.
  • day-star 4 is provided with fourteen teeth and the drive mechanism is made so as to rotate this star step by step each corresponding to two steps of its own teething while commutation takes place.
  • the two members 2 and 4 are held in place by the two jumpers 6 and 7 pivoting about a common axis and actuated by the superposed spring blades 9 and 9'.
  • the two jumpers 6 and 7 extend on either side of axis 8 and one of them acts in a centripetal manner so as to mesh with the teeth of star 4, whereas the other acts in a centrifugal manner so as to mesh with the teeth of crown 2; it is clear that the two springs 9 and 9' are forced to bend-when either of the jumpers moves away from the therewith cooperating toothing.
  • the drive mechanism of members 2 and 4 is mounted on an assembly plate 10 fastened by two screws 11 to bottom plate 1.
  • the precise positioning of this assembly plate is obtained from head 12 cut in assembly plate 10, this head being housed in a corresponding recess of the bottom plate, and from the head of the stud 26, as shown further below.
  • Assembly platel0 is blanked together with a lateral arm 13 which is folded back at a right angle and forms a spring ensuring commutation.
  • This assembly plate 10 supports foremost a wheel-andpinion 14.
  • a stud 15 for pivoting wheel-and-pinion I4 is force-fitted or otherwise set in an aperture of assembly plate 10, as shown in FIG. 3. Its flat head ensures the axial direction position of wheel-and-pinion 14.
  • This calendar wheel 16 rotates about a cylindrical shoulder in hub 17 which rotates in an aperture 18 of assembly plate 10.
  • this hub is provided with several shoulders of various diameters. At its upper end, it bears a fingerpiece 19 force-fitted around an annular rib below which there is a second lateral finger-piece 20 which is blanked and stamped together with hub 17 and equipped with a catch 21 on its inner side.
  • Circular shoulder 22 stretches below finger-piece 20 and ensures the rotation of wheel 16; further below there is a shoulder penetrating aperture 28.
  • Hub 17 is provided at its lower end with a last shoulder on which is forcefitted a cam 23 with plan contour shown in dotted line in FIG. I.
  • the set of components l7, l9 and 23 constitutes a kind of two-finger ratchet, the fingers l9 and 20 extending approximately diametrically opposite from each other though at different levels. AS, shown in FIG. I, the lengths of those fingers also are different.
  • FIG. 3 shows that the force-fit of cam 23 to hub 17 ties the drive member to the assembly plate 10.
  • plate 10 also bears (see FIG. 2) a lever 25 pivoting about stud 26, similar to stud 15. Its foot therefore is force-fitted into an aperture of assembly plate 10 and its head keeps lever 25 axially in place.
  • the head of stud 26 is thicker than that of stud l5 and is used as a positioning element for assembly plate 10. During assembly, this head enters a cylindrical recess in the bottom plate. It is during assembly that the drive mechanism l7, 19, 23 is accurately positioned and its rotation is ensured. At that time, the central bore of hub 17 is placed on pin 27 projecting from the bottom plate. The axis of rotation for hub 17 and wheel 16 therefore is determined by pin 27 rather than by aperture 18, which latter only serves for assembly.
  • Cam 23 comprises a spirally ascending slope 28 and a descending slope 29, the shape of which will be discussed further below.
  • An intermediate slope 33 and a notch 30 are located between those first mentioned slopes.
  • the described mechanism holds the advantage of simplified construction. Assembling all parts is performed on assembly plate 10 independently of the remainder of the movement, and it will be enough thereafter to place the drive block on the bottom plate to ensure drive. Settings and required adjustments are virtually non-existent.
  • the two jumpers 6 and 7 are shown mounted on the bottom plate and stressed by the two springs 9 and 9 pressing against the bent-over tongue 33 which is part of bottom plate 1, one might also make use of a larger assembly plate also bearing jumpers 6 and 7 in another embodiment.
  • the contour of cam 23 is designed to regulate the angular speed of the drive member as a function of the sequence of operations this drive member must perform.
  • a cam judiciously designed as a function of these criteria allows achieving virtually simultaneous commutation of two coaxial members as different as a day-star with fourteen teeth and supposed to rotate one-seventh of a revolution and a date-crown with inner toothing of which the advance is only one thirtyfirst of a revolution.
  • a drive mechanism for two coaxial calendar members which rotate stepwise about their common axis in a watch movement, comprising a drive member provided with two finger-pieces for actuating each of said calendar members; a calendar wheel coaxial with the drive member and connected to the gear train of said movement; coupling means with angular play coupling the calendar wheel and the drive member; a cam rigidly connected to the drive member; a lever coupled for operation in concert with the cam; and spring means acting on the lever to ensure an instantaneous jump of the two calendar members by rotation of the drive member when the drive member is brought into a given orientation by the calendar wheel, wherein the contour of the cam is provided with a retaining notch which with the lever engages for limiting the rotation of the drive member under the influence of said spring.
  • said spring comprises an arm blanked from the assembly plate and bent perpendicularly to the plane of latter.
  • cam is provided with a spiral slope diverging from its axis starting at said retaining notch, with a descending slope nearing said axis starting at the outer end of the sprial slope, and with a third slope connecting the lower end of the descending slope to the retaining notch.
  • lever pivots about an axis and the distances from the lever pivoting axis to the beak on one hand, and to said boss on the other, are respectively larger and smaller than the distance between the pivoting axis of lever and cam.
  • cam and lever contours are such that the lever beak presses against the inner end of the descending slope when the boss penetrates the retaining notch.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
US00400140A 1972-10-13 1973-09-24 Drive mechanism for two coaxial calendar members in watch movement Expired - Lifetime US3818692A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1497372A CH575140B5 (de) 1972-10-13 1972-10-13

Publications (1)

Publication Number Publication Date
US3818692A true US3818692A (en) 1974-06-25

Family

ID=4405304

Family Applications (1)

Application Number Title Priority Date Filing Date
US00400140A Expired - Lifetime US3818692A (en) 1972-10-13 1973-09-24 Drive mechanism for two coaxial calendar members in watch movement

Country Status (5)

Country Link
US (1) US3818692A (de)
JP (1) JPS533938B2 (de)
CH (2) CH1497372A4 (de)
FR (1) FR2203105B1 (de)
GB (1) GB1438801A (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3882669A (en) * 1973-06-05 1975-05-13 Ebauchesfabrik Eta Ag Device for driving day and date indicators in a wrist-watch
US4027468A (en) * 1975-10-31 1977-06-07 General Time Corporation Day-date mechanism for travel clock
US4059953A (en) * 1976-06-18 1977-11-29 General Time Corporation Timepiece calendar indexing apparatus
US4081950A (en) * 1975-03-18 1978-04-04 Ebauches S.A. Calendar mechanism for timepiece
US20090016169A1 (en) * 2007-07-13 2009-01-15 Eta Sa Manufacture Horlogere Suisse Instantaneous display mechanism for a timepiece
US20100103780A1 (en) * 2008-10-24 2010-04-29 Eta Sa Manufacture Horlogere Suisse Device that assists in maintaining the position of a date indicator disc for a timepiece
CN101763021B (zh) * 2010-01-20 2011-08-17 福建上润精密仪器有限公司 手表日历轮或周历轮的定位杆的限位装置
US20120243388A1 (en) * 2011-03-23 2012-09-27 Montres Breguet Sa Timepiece movement including an instantaneous actuator controlled by the movement
CN103324079A (zh) * 2012-03-23 2013-09-25 奥米加股份有限公司 用于显示和校正两个不同的可测时间量的状态的机构

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3664120A (en) * 1969-09-23 1972-05-23 Record Watch Co Sa Drive mechanism for an indicator of the date or the days of the week
US3668862A (en) * 1970-08-03 1972-06-13 Junghans Gmbh Geb Timepiece showing the date and day of the week
US3696606A (en) * 1970-03-18 1972-10-10 Junghans Gmbh Geb Timepiece with indication of date and day of the week

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH454752A (fr) * 1965-07-12 1968-06-28 Valjoux Sa Pièce d'horlogerie à quantième instantané
JPS4520300Y1 (de) * 1967-04-06 1970-08-14

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3664120A (en) * 1969-09-23 1972-05-23 Record Watch Co Sa Drive mechanism for an indicator of the date or the days of the week
US3696606A (en) * 1970-03-18 1972-10-10 Junghans Gmbh Geb Timepiece with indication of date and day of the week
US3668862A (en) * 1970-08-03 1972-06-13 Junghans Gmbh Geb Timepiece showing the date and day of the week

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3882669A (en) * 1973-06-05 1975-05-13 Ebauchesfabrik Eta Ag Device for driving day and date indicators in a wrist-watch
US4081950A (en) * 1975-03-18 1978-04-04 Ebauches S.A. Calendar mechanism for timepiece
US4027468A (en) * 1975-10-31 1977-06-07 General Time Corporation Day-date mechanism for travel clock
US4059953A (en) * 1976-06-18 1977-11-29 General Time Corporation Timepiece calendar indexing apparatus
CN101441433B (zh) * 2007-07-13 2011-08-10 奥米加股份有限公司 用于时计的即时显示机构
US20090016169A1 (en) * 2007-07-13 2009-01-15 Eta Sa Manufacture Horlogere Suisse Instantaneous display mechanism for a timepiece
US7643379B2 (en) * 2007-07-13 2010-01-05 Omega S.A. Instantaneous display mechanism for a timepiece
US20100103780A1 (en) * 2008-10-24 2010-04-29 Eta Sa Manufacture Horlogere Suisse Device that assists in maintaining the position of a date indicator disc for a timepiece
US8040759B2 (en) * 2008-10-24 2011-10-18 Eta Sa Manufacture Horlogère Suisse Device that assists in maintaining the position of a date indicator disc for a timepiece
CN101763021B (zh) * 2010-01-20 2011-08-17 福建上润精密仪器有限公司 手表日历轮或周历轮的定位杆的限位装置
US20120243388A1 (en) * 2011-03-23 2012-09-27 Montres Breguet Sa Timepiece movement including an instantaneous actuator controlled by the movement
US8953415B2 (en) * 2011-03-23 2015-02-10 Montres Breguet Sa Timepiece movement including an instantaneous actuator controlled by the movement
CN103324079A (zh) * 2012-03-23 2013-09-25 奥米加股份有限公司 用于显示和校正两个不同的可测时间量的状态的机构
US8942067B2 (en) 2012-03-23 2015-01-27 Omega S.A. Mechanism for displaying and correcting the state of two different time measurable quantities
CN103324079B (zh) * 2012-03-23 2015-12-23 奥米加股份有限公司 用于显示和校正两个不同的可测时间量的状态的机构

Also Published As

Publication number Publication date
JPS533938B2 (de) 1978-02-13
CH1497372A4 (de) 1975-09-30
FR2203105A1 (de) 1974-05-10
DE2349759A1 (de) 1974-04-18
DE2349759B2 (de) 1975-09-25
CH575140B5 (de) 1976-04-30
GB1438801A (en) 1976-06-09
JPS4974978A (de) 1974-07-19
FR2203105B1 (de) 1976-09-17

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