EP0079301B1 - Dispositif d'entraînement intermittent d'une pièce en rotation - Google Patents

Dispositif d'entraînement intermittent d'une pièce en rotation Download PDF

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Publication number
EP0079301B1
EP0079301B1 EP82810435A EP82810435A EP0079301B1 EP 0079301 B1 EP0079301 B1 EP 0079301B1 EP 82810435 A EP82810435 A EP 82810435A EP 82810435 A EP82810435 A EP 82810435A EP 0079301 B1 EP0079301 B1 EP 0079301B1
Authority
EP
European Patent Office
Prior art keywords
pinion
teeth
rotation
driving
transmission assembly
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
EP82810435A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0079301A1 (fr
Inventor
Ernst Ammann
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.)
ETA SA Manufacture Horlogere Suisse
Original Assignee
Eta SA Fabriques dEbauches
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 Eta SA Fabriques dEbauches filed Critical Eta SA Fabriques dEbauches
Publication of EP0079301A1 publication Critical patent/EP0079301A1/fr
Application granted granted Critical
Publication of EP0079301B1 publication Critical patent/EP0079301B1/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
    • 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
    • G04B19/25353—Driving or releasing mechanisms wherein the date indicators are driven or released mechanically by a clockwork movement driven or released stepwise by the clockwork 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
    • G04B13/00—Gearwork
    • G04B13/002—Gearwork where rotation in one direction is changed into a stepping movement

Definitions

  • the present invention relates to an intermittent drive device for a rotating part.
  • the invention relates to a mechanism for driving the date indicator for watches with analog display and, preferably, for electronic watches.
  • This device comprises a driving mobile, a transmission assembly and first and second immobilization means.
  • the driving mobile is pivotally mounted about an axis and comprises on a portion of its periphery, at least one drive means comprising a toothed sector.
  • the transmission assembly is mounted pivoting about an axis and comprises first and second pinions each provided with peripheral toothing to mesh with the toothed sector, respectively a toothing carried by the part to be driven.
  • the first and second immobilization means cooperate with each other so as to allow the first pinion to rotate only when it is engaged with the toothed sector, said immobilization means allowing the driving mobile to rotate freely.
  • the date is displayed conventionally by a disc or a crown which carries on one of its faces the numbers from 1 to 31, these numbers parading successively in front of a window arranged in the dial of the watch.
  • This indicator is rotated by the gear train, so that it advances one step every 24 hours.
  • the locking in each of the display positions of the date indicator is usually carried out by an elastic locking member engaging successively between the different teeth of a toothing formed on the disc or the crown as and when advance of the indicator.
  • the motive force which must be applied to it is thus clearly greater than the motive force only necessary to drive the hands of the watch, since it is necessary in addition to supply the energy to erase the elastic locking member.
  • CH-A-538.136 describes one such mechanism which makes it possible to reduce the torque to be applied to drive the date indicator.
  • the elastic locking device of the date indicator is effectively removed in its different positions, which decreases the torque applied.
  • this mechanism has other drawbacks.
  • Such a device comprises a drive disc, an intermediate plate provided with pins which cooperate with the disc and a date display disc which is provided on its internal periphery with deep notches.
  • the intermediate plate is provided with two pins which can penetrate into the notches of the date disc and which can also cooperate with a projection and two notches formed on the periphery of the drive disc.
  • the disc thus drives the date disc by one step at each of its rotations by means of the plate provided with its two pins.
  • English patent application GB-A-2,026,213 describes a date mechanism comprising a driving mobile driven by the train of the watch and provided at its periphery with a toothed sector and a transmission assembly comprising a first toothing to mesh with the toothed sector and a second toothing to drive the date disc, as well as a jumper cooperating on the one hand with the second toothing of the transmission assembly and with a cam carried by the driving mobile.
  • the jumper pivotally mounted on the watch plate has two arms, one of which bears against the cam and the other, elastic, in the second toothing.
  • the cam is arranged so that, when the toothed sector is not in engagement with the first teeth, the elastic arm is armed and ensures the positioning of the transmission mobile while when the toothed sector meshes with the first teeth, the elastic arm is disarmed and allows the transmission mobile to rotate freely.
  • the presence of the jumper allows the date disc to be driven, by a correction mechanism, at least when the toothed sector does not mesh with the teeth of the transmission mobile.
  • This solution has two drawbacks. First of all, the jumper almost constantly rubs against the cam, resulting in a loss of energy. In addition, when the toothed sector is engaged, the drive of the date disc by the correction mechanism may damage one or the other part of the date mechanism.
  • the present invention specifically relates to an intermittent drive device for a workpiece, and more particularly a date disc which has a low torque but which does not have the drawbacks of the prior art described, that is to say that is to say which effectively ensures a good locking of the date disc in each position, which prevents shocks and friction when the disc is moving and which allows correction of the disc at all times.
  • the transmission assembly also includes retractable connecting means for securing in rotation the two pinions, as long as the holding torque does not exceed a limit value.
  • the date disc can be freely corrected, whatever the relative positions of the driving mobile and the transmission mobile, while guaranteeing correct positioning of the date device, this position being defined by the connecting means, such as a long necklace integral with one of the pinions and cooperating with the teeth of the other.
  • the drive means of the driving mobile comprise two gear teeth which mesh with the teeth of the transmission mobile.
  • the second immobilization means comprise n pins (preferably 4) integral in rotation with the transmission mobile. These pins are arranged on the same circle centered on the axis of rotation of the return mobile and they are angularly offset by 360 ° / n.
  • the first immobilization means comprise a circular rim which is integral in rotation with the driving mobile and disposed at the same level as the pins.
  • This rim is provided with two notches arranged in such a way that, during the training phase of the date indicator, one of the lugs can cross the rim and that, on the contrary, outside of the training phases of the date indicator, two or both pins are in abutment on the rim to thus ensure the locking of the transmission mobile and consequently the locking of the date indicator by means of the engagement of the transmission mobile with the teeth of the date disc.
  • the pins do not play any driving role during the rotation of the transmission mobile. Consequently, the dimensions of the notches on the flange are not critical and it is possible to give them a sufficient width so that there is no problem of introduction of the pins in these notches.
  • the watch conventionally comprises a carriageway 2 and a barrel wheel 4 which are mounted on an axis 6 integral with the frame 8 of the watch.
  • a timer wheel 10 is driven by the carriageway 2 and it drives the barrel wheel 4.
  • the carriageway 2 is conventionally driven by a gear train driven by the motor and which acts on the minute wheel 2a integral with the floor 2. This gear train and the motor have not been shown, since they are of the conventional type and they do not relate to the invention.
  • the pinion 10a of the timer wheel 10 meshes with a wheel 12a of a date reference 12.
  • a pinion 12b forming part of the reference 12 meshes with a driving mobile bearing the general reference 14 and whose structure will be described later.
  • This driving mobile 14 cooperates with a transmission assembly bearing the general reference 16.
  • This assembly will also be described later.
  • the transmission assembly cooperates with a date indicator 18 or date crown.
  • the mobile 14 is pivotally mounted on a tenon 20 forming an integral part of the frame 8. This mobile is held on this axis by the head of a screw 22 engaged in the threaded bore 20a of the tenon.
  • the mobile 14 includes all first a toothed pinion 24 whose hub 24a extends beyond the toothing.
  • the mobile 14 has a second part constituted by a portion massive 26.
  • the portion 26 forms on the one hand a disc 26a near the frame 8, this disc comprising a toothed sector constituted for example by two teeth respectively referenced 26'a and 26 "a.
  • the part 26 defines, on the other part, a cylindrical portion 26b whose diameter is less than that of the disc 26a.
  • the portion 26b therefore comprises a side wall 26'b and a flat wall 26 "b parallel to the disc 26a.
  • the cylindrical portion 26b has a groove 30 having substantially the shape of a portion of circular crown which opens on the one hand into the flat face 26 "b and on the other hand into the lateral face 26'b by two notches 30 'and 30". He observes that the remaining portion 32 of the cylindrical part 26b delimited by the groove 30 has a thickness less than the thickness of the rest of this part.
  • the axis of symmetry of the groove 30 coincides with the axis of symmetry of the teeth 26'a and 26 "a.
  • the part 26 further comprises a central bore 26c in which the hub 24a of the pinion 24 is driven. a connection between these two parts which rotate together around the axis defined by the lug 20.
  • the transmission assembly 16 is pivotally mounted about an axis defined by a bush 40 driven on a tenon 42 forming an integral part of the frame 8.
  • the assembly 16 firstly comprises a pinion 44 mounted pivoting around the bush 40
  • the assembly 16 also comprises a plate 46 integral in rotation with the pinion 44 and which comprises 4 radiating arms 48a, 48b, 48c and 48d at the end of which are fixed pins or lugs 50a, 50b, 50c and 50d. These pins are arranged on the same circle centered on the axis XX 'of rotation of the assembly 16. The pins therefore rotate at the same time as the pinion 44.
  • the length L of the arms is such that two consecutive pins can come into contact from the lateral face 26'b of the driving mobile.
  • the groove 30 has a width and a depth sufficient to allow the free passage of the pins during the relative rotation of the two mobiles.
  • the ends 30 ′ and 30 ′′ of the groove 30 are arranged on the side wall 26 ′ b in such a way that, as will be explained later, the pins can effectively penetrate into the groove 30 when the teeth 26 ′ a and 26 "a drive the transmission assembly 16 in rotation.
  • the pinion 44 is arranged in such a way that it meshes with the teeth 26'a and 26" a of the moving part leading to certain positions thereof.
  • the transmission assembly comprises a second toothed pinion 52 which can pivot freely on the bush 40.
  • the connection between the pinion 44 and the pinion 52 is temporarily ensured by a jumper 54.
  • This jumper 54 is for example secured to the plate 46.
  • the pinions 52 and 44 are therefore integral in rotation.
  • the date crown 18 is provided on its internal periphery with teeth 18a which mesh with the teeth of the pinion 52 of the transmission assembly 16.
  • the driving mobile 14 comprises a drive means constituted by the teeth 26'a, 26 "a; and first immobilization means constituted by the groove 30 and the edge 26'b
  • the transmission assembly 16 comprises a transmission mobile constituted by the pinions 44 and 52 and second immobilization means constituted by the lugs 50 fixed at the end of the arms 48.
  • the part 26b could be replaced by a simple rim defining the side wall 26'b of the part 26b, this rim being pierced with two notches corresponding to the outlets 30 'and 30 "of the groove 30, formed in the part 26b.
  • the gear ratios between the timer wheel, the date return mobile 12 and the pinion 24 of the driving mobile are such that the driving mobile makes one revolution per 24 hour period.
  • the number of teeth on the pinion 44 of the transmission assembly is such that this pinion makes one revolution per period of 4 days. Consequently, for each 24-hour period, the crown 18 of the calendars effectively progresses by one step as it should be.
  • the transmission assembly 16 is immobilized in rotation but the driving mobile 14 can rotate freely under the effect of the drive of the date reference.
  • the jumper 52 fulfills its function and secures the plate 46 with the pinion 52.
  • the elastic end 54 of the jumper cooperates with the pinion 52.
  • the pinion 52 is therefore also immobilized in rotation and the crown 18 is also immobilized by the cooperation of the teeth of the pinion 52 with the teeth 18a of the date crown.
  • the pinion 52 is permanently engaged with the toothing 18a of the crown. It follows that, thanks to conventional toothed pinion cutting techniques, it is possible to have a very small clearance between the pinion 52 and the crown 18, which ensures an excellent positioning of the latter. Of course if an external torque is applied to the crown 18, for example by a calendar display correction device, the part 46 remains locked but the pinion 52 can be rotated by the crown thanks to the elastic connection provided by long necklace 54.
  • the driving mobile 14 makes one revolution per 24 hours. It would of course be possible to envisage a training mechanism in which the leading mobile would, for example, do a lap for px24 hours. In this case, of course, the mobile should have p toothed sectors corresponding to the toothing 26'a, 26 "a and p grooves corresponding to the groove 30. Furthermore, the transmission assembly would remain identical with its four lugs.
  • the invention effectively makes it possible to obtain a device for driving a part or more precisely a date crown with low torque. Indeed, on the one hand there is no longer any elastic positioning member acting directly on the date crown, on the other hand, the transmissions of movement between the various mobiles are effectively effected by gears which reduces the clearances and shocks and which improves the positioning of the date indicator during locking which eliminates the need for external organs.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
  • Vending Machines For Individual Products (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Supply And Installment Of Electrical Components (AREA)
  • Gears, Cams (AREA)
  • Steering Controls (AREA)
  • Portable Nailing Machines And Staplers (AREA)
EP82810435A 1981-11-05 1982-10-21 Dispositif d'entraînement intermittent d'une pièce en rotation Expired EP0079301B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH7069/81 1981-11-05
CH706981A CH648176GA3 (xx) 1981-11-05 1981-11-05

Publications (2)

Publication Number Publication Date
EP0079301A1 EP0079301A1 (fr) 1983-05-18
EP0079301B1 true EP0079301B1 (fr) 1986-04-30

Family

ID=4319441

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82810435A Expired EP0079301B1 (fr) 1981-11-05 1982-10-21 Dispositif d'entraînement intermittent d'une pièce en rotation

Country Status (6)

Country Link
US (1) US4478522A (xx)
EP (1) EP0079301B1 (xx)
JP (1) JPS5886477A (xx)
CH (1) CH648176GA3 (xx)
DE (1) DE3270886D1 (xx)
HK (1) HK29588A (xx)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH661171GA3 (xx) * 1985-09-27 1987-07-15
SG102647A1 (en) * 2000-12-22 2004-03-26 Ebauchesfabrik Eta Ag Timepiece provided with a date having a large aperture

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH4205A (de) * 1891-10-10 1892-03-31 Morris Schoenfeld Automatischer Stichbestimmungsmechanismus für Stickmaschinen
CH538136A (fr) * 1971-02-05 1973-07-31 Suisse Horlogerie Mécanisme dateur pour pièce d'horlogerie
US3738097A (en) * 1971-07-12 1973-06-12 Omega Brandt & Freres Sa Louis Mechanism for driving and correcting a data disc in a day-date timepiece
CH494772A4 (xx) * 1972-04-05 1975-09-15
CH591720B5 (xx) * 1975-03-18 1977-09-30 Ebauches Sa
CH598637B5 (xx) * 1975-05-01 1978-05-12 Ebauches Sa
JPS54112677A (en) * 1978-02-22 1979-09-03 Seiko Epson Corp Calendar watch
JPS554552A (en) * 1978-06-27 1980-01-14 Seiko Instr & Electronics Ltd Date feed mechanism of watch
US4240249A (en) * 1979-03-05 1980-12-23 Kruglov Gennady A Instantaneous calendar device for timepieces

Also Published As

Publication number Publication date
HK29588A (en) 1988-04-29
JPH0337150B2 (xx) 1991-06-04
US4478522A (en) 1984-10-23
DE3270886D1 (en) 1986-06-12
JPS5886477A (ja) 1983-05-24
EP0079301A1 (fr) 1983-05-18
CH648176GA3 (xx) 1985-03-15

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