US3704583A - Date indicating mechanism for watches - Google Patents

Date indicating mechanism for watches Download PDF

Info

Publication number
US3704583A
US3704583A US222260*A US3704583DA US3704583A US 3704583 A US3704583 A US 3704583A US 3704583D A US3704583D A US 3704583DA US 3704583 A US3704583 A US 3704583A
Authority
US
United States
Prior art keywords
pins
date
disk
number ring
date number
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 - Lifetime
Application number
US222260*A
Other languages
English (en)
Inventor
Peter Dome
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.)
SOC SUISSE POUR L'IND HORLOGERE SA
SUISSE POUR L IND HORLOGERE SA
Original Assignee
SUISSE POUR L IND HORLOGERE 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 SUISSE POUR L IND HORLOGERE SA filed Critical SUISSE POUR L IND HORLOGERE SA
Application granted granted Critical
Publication of US3704583A publication Critical patent/US3704583A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • 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
    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C17/00—Indicating the time optically by electric means
    • G04C17/005—Indicating the time optically by electric means by discs
    • G04C17/0058—Indicating the time optically by electric means by discs with date indication

Definitions

  • a date indicating mechanism for watches of the type having a rotatable ring carrying date numbers on one [30] Forelg Apphcatlon Pnomy side, equidistantly spaced over the circumference Feb. 5, 1971 Switzerland ..1722/71 th r f, and m ans f r p ri di ally moving the ring past an inspection window for the date numbers, the [52] US. Cl. .,58/58 improvement comprising drive means for the ring car- [5 l 1 II.”- Cl.
  • This invention relates to a date indicating mechanism for watches, of the type having a rotatable ring carrying on one'side n date numbers equidistantly spaced over the entire circumference of the ring and means for periodically the ring through an angular distance corresponding to 360ln past an inspection window permitting the date numbers on the ring to be individually and successively observed.
  • these watches are all provided with an electric circuit generating current pulses each carrying a minute quantity of power and designed either to control' a mechanical regulating device or drive a motor.
  • the regulating device or motor By adding a date indicating mechanism to such watches, the regulating device or motor must also drive this mechanism in addition to the time indicating means and then this mechanism constitutes a frequent source of faults caused mainly by the spring locking member.
  • a date indicating mechanism has already been proposed in which a Maltese cross wheel is rotatably mounted on an axle extending perpendicularly to the plane of the date number ring and is driven by the hour hand wheel through a drive wheel making one complete revolution every 24 hours.
  • This Maltese cross wheel is provided with a pin engaging in slits provided on the date number ring, and with a circle segment member cooperating with concave surfaces provided on the teeth located between said slits. Thus the segment member secures the date number ring in the required position.
  • positioning of the date number ring is effected by engagement by two concentric surfaces carried by two movable members, i.e., the Maltese cross wheel and the date number ring, which are eccentrically mounted with,respect to each other.
  • the date number ring is generally not supported for pivotal movement about a shaft its center of rotation is usually determined by a circular bearing surface provided on the bearing plate of the watch so as toengage the date number ring.
  • slits equidistantly spaced around the circumference of a date i number ring, said slits being open at one edge of the date number ring and having parallel longitudinal edges, a longitudinal axis oriented toward the center of the date number ring, and -a radial length substantially corresponding to half the distance between the two points of intersection between the two opposed longitudinal edges of two adjacent ones of said slits and the edge of the date number ring containing the open ends of said slits;
  • a disk located in a plane extending parallel to the plane of the date number ring and rotatably mounted on a shaft centered substantially at right angles to the edge of the date number ring containing the open ends of said slits, said disk carrying four equidistantly angularly spaced pins each spaced from the axis of said shaft by a distance substantially corresponding to half the distance between the two points of intersection of the two adjacent longitudinal edges of two neighboring ones of said slits in the date number ring with the edge of the latter containing the open ends of said slits, the width of said pins being substantially equal to that of said slits and two of said pins, located in diametrically opposed positions on said disk with respect to the axis of rotation thereof, having a projecting portion of a length at least greater than the distance between the adjacent surfaces of said date number ring and said disk, the other two of said pins having a projecting portion of a length smaller than said distance; a rotatable cam located in a
  • FIG. 1 is a top plan view of a date indicating mechanism according to the present invention
  • FIG. 2 is a section taken on the line 11-11 of FIG. 1;
  • FIGS. 3 to 8 are part views of FIG. 1, showing different positions of the date number ring, pin supporting disk and rotatable cam, and i I"
  • FIG. 9 is a part view showinganother embodiment of respectively, substantially corresponds to the distance between the longitudinal axes of symmetry between two neighboring slits 4 as measuredat the level of the inner edge of the date number ring 1.
  • the length of the projecting portion of the two pins 8A and 8B is greater than the distance between the top of the disk 5 and the bottom of the annular portion 1A of the date number ring 1 whereas the length of the projecting portion of the two pins 7A and 7B is smaller than this distance, as seen in FIG. 2. Therefore, when the disk 5 is rotated around the axis of the shaft 6, for example, in clockwise direction, the pins 8A and 8B will mesh with the teeth between the slits 4 in the annular portion 1A of the date number ring 1 whereas the pins 7A and 7B will pass below the lower surface of this portion 1A without touching it.
  • the two pins 8A and 8B are made of ferromagnetic material as is the entire date number ring 1 whereas the disk 5 and the pins 7A and 7B are preferably made of non-magnetic material.
  • the mechanism shownin the drawings is designed to produce at about 24.00 hours of each day a substitution of the indication of the date number appearing inan inspection window G provided in a dial C of a watch.
  • this mechanism comprises a date number ring 1 composed of two portions, namely a first annular portion 1A carrying on its upper face the numbers 1 through3l corresponding to the number of days in a month, and-a second cylindrical portion 18 supporting the date number ring I on a seat 2A provided on a bearing plate 2 of the watch, the seat 2A having an annular'shape and extending symmetrically around a shaft 3 carrying the hour hand of the watch the rest of whichis not shown in the drawings as it does not relate to the present invention.
  • each slit 4 is slightly greater than half the distance between the ends a and b of the opposed longitudinal edges of two neighboring slits 4.
  • the illustrated date indicating mechanism further comprises a disk 5 rotatably mounted on a shaft 6 whose longitudinal axis extends substantially at right angles relative to a point on the inner edge of the date number ring 1, the shaft 6 being secured in the bearing plate 2.
  • the disk 5 carries four pins 7A, 78, 8A and 8B having a diameter substantially corresponding to the width'of the .slits 4 in the date number ring 1 and symmetrically arrangedin opposed pairs on the disk 5 with respect to the shaft 6-.
  • the pins 7A, 78, 8A and 8B are secured in the disk 5 in the manner shown in FIG. 2 with reference to the pin 78 and their lower ends are flush with the bottom surface of the disk 5.
  • a magnetic circuit including a permanent magnet 9, secured to the hearing plate 2 adjacent the cylindrical skirt 1B of the date number ring 1 and an L-shaped magnetizable armature l0 engaging the magnet 9 with its shorter leg and the bearing plate 2 with its longer leg which rests on the bearing plate 2 and extends in part below the disk 5 and thus facesthe lower ends of the pins 8A and 8B irrespective of the angular position of the disk 5 so that the air gap between these pins and the armature 10 will remain always the same.
  • This magnetic circuit will appear from the following description.
  • the illustrated date indicating mechanism further comprises a rotatable substantially circular cam 11 firmly secured to a gear wheel 12 and rotatably mounted on a shaft l3-extending upwardly-from the mounting plate 2 in a position such that the plane passing through the longitudinal axes of the shafts 13 and .6 forms a dihedral angle with the plane passing through the longitudinal axis of the shaft 6 and that of the shaft 3. r I
  • the gear wheel 12 is driven by a gear wheel 14 mounted on the shaft 3 and driven directly by a gear wheel 15 of the hour hand of the watch.
  • the diameter of the gear wheel 12 and that of the gear wheel 14 are so chosen that the circular cam 11 will make one complete revolution every 24 hours.
  • the circular cam 11 engages with its circular edge portion two pins on the disk 5, which in the position of the disk 5 shown in FIG. 1 are the pins 7A and 8A, so that the disk 5 cannot move angularly in either direction of rotation.
  • the pins 8A and 8B engage in two slits 4 in the date number ring 1 and as the diameter of these pins substantially cornesponds to the width of the slits 4, they ensure perfect locking of the date number ring 1 in its angular position provided that the disk 5 itself remains locked by the circular cam 1 1.
  • the angular spacing of the slits 4 the dimensions of the pins 8A and 88 as well as their positions on the disk 5 and the position of-the disk 5 on the bearing plate 2 must be very accurate.
  • Such accurate dimensions can be achieved in practice but .in the illustrated embodiment it is not indispensable, particularly in view of the action exerted by the permanent magnet 9 and the magnetic circuit in which this magnet is incorporated and which has been described above.
  • the periphery of the circular cam l is not completely circular.
  • a length of about I] IQ of the circumference of the earn 1 is occupied by two recesses 16 and 17 and a projection 18 located between the recesses 16 and 17.
  • the projection 18 has a substantially trapezoidal shape, its width at the top is slightly smaller than the distance between two adjacent ones of the pins 7A, 8A, 7B and 8B on the disk 5 and its length is such that it does not engage the shaft 6, for example, during angular movement of the circular cam 11 from the position indicated in FIG. 4 to that shown in FIG. 6.
  • the recesses 16 and 17 each have an approximately semicircular shape, a width slightly greater than the diameter of the pins 7A, 78, 8A and8B and a depth slightly greater than half the diameter of the pins.
  • the circular cam 11 is driven by the gear wheel 14 in an anticlockwise direction.
  • the pins 8A and 8B the disk 5 and consequently the date number ring'l are locked in their positions indicated in FIG. 1.
  • This condition is maintained until the projection 18 engages the pin 7A, as shown in FIG. 3, for thereafter the disk 5 in moved in a clockwise direction by the projection 18, as seen in FIG. 4.
  • the disk 5 further has its pins 8A and 8B meshing with the teeth 1C of the date number ring 1, angular movement of the disk-5 will produce a corresponding angular movement of the date number ring 1.
  • the angular movement of the date number ring 1 follows a sinusoidal course.
  • This the speed of angular movement of the date number ring 1 is relatively small when the projection 18 begins to exert its pressure on the pin 7A, as shown in FIG. 3, and gradually increases as the projection 18 approaches its position shown in FIG. 5, in which position the longitudinal axis of the projection 18 is in alignment with the plane'passing through the axes of simmetry of the shaft 13 and 6 and consequently the pin 8A occupies its position located most closely to the bottom of the slit 4 in which it is engaged.
  • the speed of angular movement of the date number ring 1 is greatest when this ring passes through the position shown in FIG. 5 and thereafter it decreases until it is reduced to zero.
  • the dimensions of the circular cam 11, projection 18, recesses 16 and 17 and the transmission ratio of the gear wheels 12 and 14 are such that the time required for moving the disk 5 through an angular distance of l is about I to 2 hours. Consequently the time required for moving'the date number ring 1' through an angular distance of 360l3l, i.e., the time required for replacing the date number appearing in the inspection window G by the following date number, is likewise about 1 to 2 hours.
  • the date number ring 1 will remain locked not only when it is kept in its rest position by the pair of pins 8A and 8B engaging in two adjacent slits 4 and by the pair of pins 8A and 7Aengaged by thecircular peripheral portion of the cam 11, but also during the angular movement of the date number ring 1 imparted thereto by the pin 8A or 88 on the disk 5, the projection l8 on the'circular cam 11 or the recess 16 or 17 in which engage the pins of the disk 5, the angular position of the circular cam l 1 being controlled by the gear train of the watch.
  • all members of the described drive mechanism have a symmetrical configuration so that this drive mechanism can be used both for moving the date number ring 1 in a clockwise 8B and the teeth 1C direction, as described above, and for moving the date number ring in an anticlockwise direction, particularly when it is desired to change the date appearing in the inspection window G by actuation from the outside of the watch, for example, by means of the time adjusting device of the watch.
  • the date number ring 1 has a very simple geometric serrated configuration formed by the series of teeth 1C defined by the'slits 4 with their open ends on the inner edge of the date number ring, and as the drive pins 7A, 7B,.8A, and 88 on the disk 5 have a shape which can be easily produCCd, the play in the angular displacement of the circular cam 11 may be very small. Further, due to the disposition of the disk 5 carrying the pins 7A, 78, 8A and 88, a radial play which may exist in the positioning of the date number ring 1 will produce only a very small angular play of the date number ring. a
  • the date number ring. 1 has slits 4 located with their open ends on the outer edge of the date number ring 1, as shown in FIG. 9.
  • the disk 5 and the rotatable circular cam 11 are mounted on shafts extending with their axes at right angles to the outside edge of the date number ring 1 in a plane-forming a dihedralangle of 45 with the plane passing through the axis of rotation of the disk. 5 and the axisof symmetry of the date number ring. 1.
  • the date indicating mechanism of the present invention can be used for mechanically operated watches as well as electromechanically or electronically operated watches.
  • a date indicating mechanism for watches of the type havinga rotatable date number ring carrying on one side n chalumbers equidistantly spaced over the entire circumference of the ring and means for periodically driving the ring through an angular distance corresponding to 360/n past an inspection window permitting the date numbers on the ring to be individually and successively observed
  • said drive means comprising a series of n slits equidistantly spaced around the circumference of the rotatable date number ring, said slits being open at one edge of the date number ring and having parallel longitudinal edges, a longitudinal axis oriented toward the center of the date number ring, and a radial length substantially corresponding to half the distance between the two points of intersection between the two opposedlongitudinal edges of two adjacent ones of said slits and the edge of the date number ring containing the open ends of said slits;
  • a disk located in a plane extending parallel to the plane of the date number ring and rotatably mounted on a shaft centered substantially at right angles to the edge of the date number ring containing the open ends of said slits; said disk carrying four equidistantly angularly spaced pins each spaced from the axis of said shaft of said disk by a distance substantially corresponding to half the distance between the two points of intersection of the two adjacent longitudinal edges of two neighboring ones of said slits in the date number ring with the edge of the latter containing the open ends of said slits, the width of said pins being substantially equal to that of said slits; said pins, located in diametrically opposed positions on said disk with respect to the axis of rotation thereof, having a projecting portion of a length at least greater than the distance between the adjacent surfaces of said date number ring and said disk, the other two of said pins having a projecting portion of a length smaller than said distance;
  • a rotatable substantially circular cam located in a plane extending parallel to the plane of said date number ring and having an operative profile composed of a first and a second portion, said first portion extending in a circular'direction around the axis of rotation of said rotatable cam and being designed for locking said date number ring in one of its n angular positions, the axis of rotation of said rotatable cam being positioned so that said first portion of the rotatable cam will engage two neighboring ones of said pins on said disk;
  • said second portion of said rotatable cam being designed for moving said date number ring from a given angular position to the next one and including a radial projection having a width corresponding at most to the distance between two neighboring ones of said pins, and two recesses arranged one on each side of the radial projection and having a width at least corresponding to that of said pins, and
  • a kinematic chain for moving said rotatable cam by one revolution each 24 hours from the gear train of the watch.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
US222260*A 1971-02-05 1972-01-31 Date indicating mechanism for watches Expired - Lifetime US3704583A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH172271A CH538136A (fr) 1971-02-05 1971-02-05 Mécanisme dateur pour pièce d'horlogerie

Publications (1)

Publication Number Publication Date
US3704583A true US3704583A (en) 1972-12-05

Family

ID=4217069

Family Applications (1)

Application Number Title Priority Date Filing Date
US222260*A Expired - Lifetime US3704583A (en) 1971-02-05 1972-01-31 Date indicating mechanism for watches

Country Status (5)

Country Link
US (1) US3704583A (zh)
JP (1) JPS5141071B1 (zh)
CH (1) CH538136A (zh)
DE (1) DE2205043C3 (zh)
FR (1) FR2124471B1 (zh)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4060977A (en) * 1975-05-01 1977-12-06 Ebauches S.A. Timepiece
US5282179A (en) * 1991-02-25 1994-01-25 Eta Sa Fabriques D'ebauches Calendar mechanism for chronograph watch
US20040057342A1 (en) * 2002-09-19 2004-03-25 Feng-Lung Chang Watch photo dial plate
CN104914703A (zh) * 2014-03-10 2015-09-16 Eta瑞士钟表制造股份有限公司 用于驱动模拟指示器、尤其是日期环的装置
US9256207B2 (en) 2014-04-03 2016-02-09 Eta Sa Manufacture Horlogère Suisse Timepiece movement provided with a drive mechanism for the periodic or intermittent movement of an analogue indicator
CN105988355A (zh) * 2015-03-19 2016-10-05 Eta瑞士钟表制造股份有限公司 包括模拟显示器驱动装置的钟表机芯
US20170031320A1 (en) * 2014-04-03 2017-02-02 Eta Sa Manufacture Horlogere Suisse Electronic clock movement comprising an analog display of several items of information
US20170205769A1 (en) * 2016-01-18 2017-07-20 Eta Sa Manufacture Horlogere Suisse Timepiece movement including an analogue display

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH648176GA3 (zh) * 1981-11-05 1985-03-15

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB172591A (en) * 1920-06-29 1921-11-29 Horlogerie Et Bijouterie De Ge Improvements in or relating to clocks, watches, and like instruments
DE1042477B (de) * 1953-10-09 1958-10-30 Chs Tissot & Fils S A Kalenderuhr
US3367104A (en) * 1966-03-11 1968-02-06 Hamilton Watch Co Watch calendar drive mechanism

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB172591A (en) * 1920-06-29 1921-11-29 Horlogerie Et Bijouterie De Ge Improvements in or relating to clocks, watches, and like instruments
DE1042477B (de) * 1953-10-09 1958-10-30 Chs Tissot & Fils S A Kalenderuhr
US3367104A (en) * 1966-03-11 1968-02-06 Hamilton Watch Co Watch calendar drive mechanism

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4060977A (en) * 1975-05-01 1977-12-06 Ebauches S.A. Timepiece
US5282179A (en) * 1991-02-25 1994-01-25 Eta Sa Fabriques D'ebauches Calendar mechanism for chronograph watch
US20040057342A1 (en) * 2002-09-19 2004-03-25 Feng-Lung Chang Watch photo dial plate
US9411311B2 (en) 2014-03-10 2016-08-09 Eta Sa Manufacture Horlogere Suisse Device for driving an analogue indicator, particularly a date ring
JP2015169660A (ja) * 2014-03-10 2015-09-28 ウーテーアー・エス・アー・マニファクチュール・オロロジェール・スイス 特に日付リングであるアナログインジケータを駆動するためのデバイス
CN104914703A (zh) * 2014-03-10 2015-09-16 Eta瑞士钟表制造股份有限公司 用于驱动模拟指示器、尤其是日期环的装置
CN104914703B (zh) * 2014-03-10 2017-06-09 Eta瑞士钟表制造股份有限公司 用于驱动模拟指示器、尤其是日期环的装置
US9256207B2 (en) 2014-04-03 2016-02-09 Eta Sa Manufacture Horlogère Suisse Timepiece movement provided with a drive mechanism for the periodic or intermittent movement of an analogue indicator
US20170031320A1 (en) * 2014-04-03 2017-02-02 Eta Sa Manufacture Horlogere Suisse Electronic clock movement comprising an analog display of several items of information
US9874855B2 (en) * 2014-04-03 2018-01-23 Eta Sa Manufacture Horlogere Suisse Electronic clock movement comprising an analog display of several items of information
CN105988355A (zh) * 2015-03-19 2016-10-05 Eta瑞士钟表制造股份有限公司 包括模拟显示器驱动装置的钟表机芯
US9557714B2 (en) 2015-03-19 2017-01-31 Eta Sa Manufacture Horlogere Suisse Timepiece movement including an analogue display drive device
CN105988355B (zh) * 2015-03-19 2018-05-11 Eta瑞士钟表制造股份有限公司 包括模拟显示器驱动装置的钟表机芯
US20170205769A1 (en) * 2016-01-18 2017-07-20 Eta Sa Manufacture Horlogere Suisse Timepiece movement including an analogue display
US10054907B2 (en) * 2016-01-18 2018-08-21 Eta Sa Manufacture Horlogere Suisse Timepiece movement including an analogue display

Also Published As

Publication number Publication date
FR2124471A1 (zh) 1972-09-22
DE2205043C3 (de) 1974-08-29
CH172271A4 (zh) 1973-01-31
DE2205043A1 (de) 1972-08-10
FR2124471B1 (zh) 1974-08-02
CH538136A (fr) 1973-07-31
DE2205043B2 (de) 1974-02-07
JPS5141071B1 (zh) 1976-11-08

Similar Documents

Publication Publication Date Title
US3432016A (en) Magnetic roller clutch
JP2525360B2 (ja) 時 計
US3704583A (en) Date indicating mechanism for watches
GB1313631A (en) World timepiece
US2456122A (en) Time zone watch
JPH02281181A (ja) 時計機構本体用アナログ式表示構成要素部分
US3695035A (en) Timepiece movement
US9874855B2 (en) Electronic clock movement comprising an analog display of several items of information
US3710567A (en) Calendar watch with isolated hour hand changing means combined with synchronization gearing
US4541725A (en) Perpetual calendar mechanism comprising a four year cycle indicator
US3859783A (en) Day-date calendar mechanism
US3693344A (en) Timepiece movement
US3892068A (en) Timepiece having a motor spring and a barrel
US2040421A (en) Numeral clock
US3780524A (en) Digital display indicator
US3969888A (en) Driving mechanism for day-date calendar device
US4427301A (en) Timepiece with an activating mechanism
US2650467A (en) Calendar timepiece
US4372687A (en) Instantaneous calender device with spring and tappet mounted on rotary shifter
GB1449257A (en) Calendar device
US3695029A (en) Calendar day and date watch
US3537255A (en) Day-date watch
JP2015169660A (ja) 特に日付リングであるアナログインジケータを駆動するためのデバイス
US3875739A (en) Control mechanism of at least one element of a timepiece which is running step by step
US3848400A (en) Control mechanism for watch movements