US3817024A - Time-setter for an electronic timepiece - Google Patents

Time-setter for an electronic timepiece Download PDF

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Publication number
US3817024A
US3817024A US00314406A US31440672A US3817024A US 3817024 A US3817024 A US 3817024A US 00314406 A US00314406 A US 00314406A US 31440672 A US31440672 A US 31440672A US 3817024 A US3817024 A US 3817024A
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United States
Prior art keywords
cam
motion
arbor
watch
lever
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Expired - Lifetime
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US00314406A
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English (en)
Inventor
K Noguchi
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Citizen Watch Co Ltd
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Citizen Watch Co Ltd
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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
    • G04B27/00—Mechanical devices for setting the time indicating means
    • G04B27/004—Mechanical devices for setting the time indicating means having several simultaneous functions, e.g. stopping or starting the clockwork or the hands
    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C13/00—Driving mechanisms for clocks by master-clocks
    • G04C13/08—Slave-clocks actuated intermittently
    • G04C13/10—Slave-clocks actuated intermittently by electromechanical step advancing mechanisms
    • G04C13/11—Slave-clocks actuated intermittently by electromechanical step advancing mechanisms with rotating armature
    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C9/00—Electrically-actuated devices for setting the time-indicating means

Definitions

  • An electronic watch comprising a motor for converting electrical energy into mechanical rotational movement, an actuating means operable from the outside of the casing of the watch, and an arbor means for the hand of the watch.
  • a gear train couples the motor to the arbor means and a cam means is operatively connected to the actuation means and the watch hands.
  • the cam means are controlled by the operation of the actuation means for setting at least one of the hands of the watch to a reference position whereby the watch may be set by merely operating the actuation means.
  • clutch means In the case of conventional mechanical or electronic watches, clutch means, preferably of the frictional type, must be provided in the gear train arranged between time indicating hand arbor and the escapement, for release of excess torque at thisclutch means when it develops as the time-setting operation of a heart cam member or the like.
  • clutch means inserted in the gear train will make the latter into a highly complicated design and arrangement, an increased thickness of the timepiece movement and a substantial difficulty in the arrangement of such gear train.
  • the main object of the present invention is to provide an improved time-indicator correction mechanism, devoid of such additional mechanical clutch means in the gear train, for obviating the above mentioned conventional drawbacks.
  • an electronic watch which includes means for conversion of electrical energy into a corresponding mechanical rotational movement, and a time-display hand correction cam means controllable by manipulation of an operating member, preferably a push button manipulatable from the outside of the watch movement.
  • a gear train extends between said motion conversion means and an arbor for said time-display hand, thus excess torque developed by the correction operation of said correcting cam is released through said motion conversion means per se.
  • FIG. 1 is a schematic plan view of the first embodiment of the invention in its regular operating state.
  • FIG. 2 is a similar view to FIG. I, wherein a timesetting button of the timepiece has been pushed in for adjusting the time-indicating hands to a desired hour time.
  • FIG. 3 is a part of the timepiece movement shown in FIGS. 1 2, wherein the operation is such that a certain selected minute time has been set.
  • FIG. 4 is a sectional view taken along a broken section line IV IV shown in FIG. 1.
  • FIG. 5 is an enlarged and somewhat modified part of FIG. 4, constituting the second embodiment of the invention.
  • FIG. 6 is a similar view to FIG. 1, showing the third embodiment of the invention.
  • numeral 1 represents only partially a base plate, such as pillar plate, on which a motiontransmitting lever 2 is pivotably mounted at 3.
  • This lever 2 comprises first or uppermost element 2A, a second or middle element 23 and a third or lowermost element 2C fixed rigidly together by means of pins 2a and 2b.
  • the first lever element 2A comprises a first elongated resilient arm 20.
  • the second lever element 28 comprises a second elongated resilient arm 2d.
  • the third lever element 2C is provided with a third angular-shaped, rather rigid arm 2e.
  • An urging spring 4 has a root portion 4a which is fixedly attached to the base plate 1 by means of pins 10 and 33, an intermediate bent portion 4b which is kept normally in pressure-contact with a shoulder 13 formed on the plate 1, and a tip end portion 4c which is kept always in pressure contact with the arm 2 for urging resiliently the latter to turn clockwise in FIG. 1 around its pivot pin 3.
  • Numeral 5 represents a first cam which is fixedly attached to a conventional seconds hand arbor 6 for return operation of the seconds hand, not shown, as will be more fully described hereinafter.
  • afsecond cam 7 which is fixedly attached to a conventional minute hand arbor 8 for return operation of the minute hand, not shown, as will be more fully described hereinafter.
  • the first cam 5 has preferably a heart cam configuration as shown, while the second cam 7 has a generally disc configuration having a relatively large peripheral notch 7a as a preferred shape shown in FIGS. 1 3.
  • a first cam control lever 9 having generallya L- shape when seen in FIGS. 1 and 2, and comprising an elongated, slightly resilient arm portion 9c and a root portion 9d made integral therewith, and its root portion 9d is pivotably mounted on the pin 10, while its arm portion is formed at its tip end with an active surface 9a and a curved recess 9b as shown.
  • the active surface 9a is kept in contact with the cam 5, as shown in FIG. 2.
  • the lever 9 is shown in its regular and nonoperating position in FIG. 1.
  • the first resilient arm 20 is kept in pressure contact with a projection 9e of the lever 9 which defines partly the recess 9b, thereby the last mentioned lever 9 being normally kept in its non-operating position shown in FIG. 1.
  • the extreme position is defined by a stationary stop pin 14 which is studded on the base plate 1.
  • a second cam control lever 11 is pivotably mounted on the base plate 1 at 12.
  • This lever 11 is formed with an operating end 1 la, a curved recess 11b and a projection llc, the latter being normally kept in pressure contact with the tip end of the second lever arm 2d of said lever 2 for keeping the cam control lever 11 in its non-operating position shown in FIG. 1.
  • the operating end 11a is kept in physical contact with the second control cam 7 as shown either in FIG. 2 or 3, as the case may be.
  • the tip end of the second resilient arm 2d of lever 2 is kept in contact with the projection 110.
  • a stationary shoulder 15 on the base plate 1 for cooperating the lever projection 11:.
  • a conventional minute hand pinion 8a is made rigid with the arbor 8.
  • a conventional second wheel 16 is loosely mounted on the arbor 8.
  • a seat ring 17 is made rigid with the arbor 8 on which the inner periphery of a perforated disc spring 18 abuts, while the latter is kept in pressure engagement by its outer peripheral zone with the second wheel 16, thus this wheel being resiliently urged axially upwards against second cam 7.
  • Conventional seconds hand pinion 6a is made inte- I gral withthe arbor 6 and conventional fourth wheel 6b is arranged rigidly with the same arbor 6.
  • Third wheel 19 comprises a third gear 19a and a third pinion 19b made rigid with each other.
  • Third pinion 19b meshes with second wheel 16.
  • Fifth wheel 20 meshes with fourth wheel 6b.
  • Sixth wheel 21 comprises a gear 21a and a pinion 21b made rigidwith each other, the sixth pinion 21b meshing with said fifth wheel 20.
  • Indexing wheel 22 comprises a gear 22a and a pinion 22b made integral with each other; the indexing pinion 22b meshing with said'sixth gear 21a, while the indexing gear 22a is adapted for periodical cooperation with a conventional impulse pin 24b mounted on a cam 24a comprised in a drive balance wheel assembly 24.
  • Indexing gear 22a is stepwise positioned magnetically by a stationary positioning magnet 23 mounted on the base plate 1, when the timepiece movement goes.
  • the balance wheel assembly is provided with two pairs of permanent magnets, of which only a pair is shown schematically at 33 in FIG. 4, arranged to cooperate with stationary coil means .34 shown only-schematically and partiallytherein.
  • Numeral 25 represents a conventional cannon wheel which is rotatably mounted on the minute hand arbor 8 and provided with an hour hand, not shown.
  • Numeral 26' represents a conventional minute wheel having a gear 26a and a pinion 26b made rigid therewith.
  • minute pinion 26b meshes as conventionally with the cannon wheel 25, while the gear 26a meshes with the minute hand pinion 8a.
  • Numeral 27 represents abalance stop lever which has a pivot pin 32 studded on the base plate 1.
  • This lever 27 is formed integrally with rigid projections 27a, 27b and 27d and with an elongated and resilient arm 270 which is kept in pressure contact with a stop pin 28 studded on the plate 1.
  • the second projection 27b is kept in pressure engagement with the rigid arm 2e of the motion-transmitting lever 2 when the balance stop lever 27 is in its off-service position shown in FIG. 1.
  • the lever 27 is subjected resiliently to a clockwise turning effort accumulated therein around its pivot 32, when freed from contact with said rigid arm 2e, as clearly seen from comparison of FIG. 1 with FIG; 2.
  • the first projection 27a thereof is brought into cooperative engagement with stop cam 24a 'whichiis rigidly and concentrically attached on the balance wheel arbor shown at 24c.
  • the clockwise turning movement of the freed stop lever 27 is limited by contact of its third projection 27d. with a land 29 formed integrally on the plate 1.
  • Numeral 30 repr esents schematically and partially a self-contained battery which feeds currents through a conventional transistored drive circuit, not shown, to the coil meanst34, although the wiring connections have been omitted from the drawing only for simplicity.
  • Numeral 3' represents ,an outside operating member, preferably in the form of push button or reciprocatingly operable stem, such as conventional time-setting stem, arranged for cooperation with one end of the motiontransmitting lever 2, although its bearing means and re- 4 turn spring have been omitted from the drawing only for simplicity.
  • the resiliently urged balance stop lever 27 is released from contact by its second projection 27b with the rigid arm 2e of motion-transmitting lever 2 and turns clockwise a certain predetermined angle around its pivot pin 32, until its first projection 27a will have been brought into its cooperating position with either projection 24d or 24e of stop cam 24a on the oscillating balance wheel assembly, 24 as was only briefly referred to hereinbefore, thereby the latter being positively prevented its oscillating movement and kept stationary.
  • first cam control lever 9 With clockwise pivotal movement of first cam control lever 9, its active end surface 9a is brought into contact with first cam 5, thereby the latter being forcibly turned to its zero position corresponding to that of the seconds hand. This position is shown in FIG. 2.
  • the ratio in returning angle between the second cam 7 for minute hand and the first cam 5 for seconds hand is 3 20 and thus different from the regular rate 1 60. Therefore, there must be a certain amount of slippage between the minute hand arbor 8 and the seconds hand arbor 6.
  • the aforementioned clutch comprising the combination of seat 17 and disc spring l8 serves well.
  • the notch 7a is so dimensioned as to cover an adjustable range of :4 minutes, which range may naturally be modified as occasion desires.
  • both cam control levers 9 and 11 are turned clockwise in the similar way.
  • the operating end 110 of second cam control lever 11 is brought into contact with the lobe surface of second cam 7 exclusive of the notch 7a, as shown in FIG. 3, thereby no positive turning effort being provided thereupon.
  • the second arm 2d of the motion-transmitting lever 2 is brought into a certain resiliently flexed position.
  • the active surface 90 of first cam control lever 9 is brought into cooperation contact with the first cam 5, as shown in FIG. 3, thereby the cam together with seconds hand arbor 6 being turned forcibly and counter clockwise in FIG. 3 an angular range corresponding to or (60' '35), so as to set the seconds hand to its zero position.
  • FIG. 3 shows the position of first cam 5 corresponding to this newly zero-set one.
  • second cam 7 will be slightly rotated in the same direction at the ratio of l 60. Since the lobe surface of second cam 7 has been finished highly smoothly, the operating end 11a of second cam control lever 11 can slide without hindrance. Thus, the minute .hand will be moved to the position of 20'. In this way, the correct time-setting operation has been completed in this case. ln this case, the clutch 17-18 will naturally not slip.
  • the operation of the indexing wheel 22 is as before. lt will be seen from the foregoing description and by reference to the heart cam configuration at 5 that B0 seconds error in the time display representation can be accomplished either in the return or advancing mode, as occasion may desire.
  • the teeth of the indexing gear 22a could be brought into collision with impulse pin 24b on stop cam 24a of the balance wheel assembly 24, thereby the wheel teeth and impulse pin being subjected to heavy damage.
  • the related parts are so dimensioned and arranged that only after the first cam control lever 9 has been brought into the locus sphere of the first cam 5, the second cam 7 will initiate its rotational movement for time display correction.
  • Numeral represents a first cam attached fixedly to seconds hand arbor 106. As seen, this cam 105 has a heart shape as before.
  • Second cam 107 is attached fixedly to a minute hand arbor, not shown, or to a further arbor, again not shown, operatively connected therewith.
  • a mechanical clutch means preferably a friction clutch of known design, between the seconds hand arbor 106 and the cam 107.
  • Numerals 109 and 111 represent first and second cam control levers, as before, which are shown, however, only partially and schematically.
  • the cam 107 is formed with a number of successive peripheral saw tooth recesses 107b each of the latter having a peripheral coverage corresponding to a minute, together with a large notch 107a having similar configuration and function as those of the foregoing notch 7a.
  • the force received by the first cam 105 for the correction of seconds hand from the lever 109 can be released by idle rotation of the indexing wheel as at 22 in the foregoing embodiment.
  • the rotational difference between the cams 107 and 105 caused by the both kinds time correction operations can be well compensated by the clutch means provided between the arbor 106 and cam 107 in the similar manner as explained in the foregoing first embodiment.
  • the motionreceiving notch 7a or 107a has been shown and described as singular, the number of the notches can be increased to a cetain plural. In this way, when the minute hand is situated, as an example, within the range of 30 1 several minutes or 45 1'" several minutes, relative to the correct time such as 35 or 45', respectively, it can be set thereto, as will be easily understood from the foregoing description.
  • the third embodiment will be described in detail.
  • the invention has been applied to a quartz wrist watch.
  • same or similar parts as those used in the first embodiment will be shown by same reference numerals, each being added with 200 for easy comparison and better understanding.
  • the motion converter adapted for conversion of electrical energy into a corresponding mechanical and rotational movement has been embodied into a miniatured stepping motor, as will be more fully hereinbelow.
  • Numeral 206 represents a second hand arbor to which a conventional fourth gear 206b and the first or seconds hand correction cam 205 which is shaped as before into a heart cam.
  • the fourth gear 206b is shown only schematically and as partially broken away.
  • the miniatured stepping motor is shown at 250, having a stator 251 and a rotor 252 magnetically coupled therewith.
  • the rotor is provided with its shaft 252a rigid therewith and rotatably mounted in suitable bearing means, not shown, which is mounted in turn in base plate 201, preferably conventional pillar plate only partially shown, and a bridge member, supported rigidly thereon although not shown.
  • the rotor 252 further comprises a 6-pole permanent magnet 252b having alternatively and radially arranged N-and S-poles, a 6- teeth ratchet wheel 2520 for reverse rotation preventing purpose and a pinion 252d.
  • These magnet 252b, ratchet wheel 252C and pinion 252d are made rigid with the rotor shaft 252a, said pinion meshing with said fourth gear 206b, as schematically represented.
  • the stator 251 comprises a pair of oppositely arranged stator halves 251a and 25lb rigidly mounted on base plate 201 although their mounting means have been omitted only for simplicity.
  • the stator 251 is fitted rigidly with an energizing coil 25lc having its terminals shown at 251d and 25le which are electrically connected with a conventional transistored electronic drive circuit of conventional design and including a quartz or crystal oscillator, although not shown, for being fed with a pulsative a.c. current as schematically shown at the lower left corner in FIG. 6.
  • An elongated and resilient spring strip 253 is fixedly mounted with its root portion on the base plate 201 by means of a collet 253a which is kept in pressure fit on a stud pin lb studded on the plate 201, while the tip end of the strip 253 is kept in engagement with one of the teeth of said ratchet 2520, thus the latter being allowed only one way stepping rotation as shown by a small arrow in FIG. 6.
  • motion-transmitting lever 202 is adapted for performing a piv- 'otal movement substantially in the direction shown by an arrow alpha when mechanically urged by intentional depression of a push button, similar to that shown at 31 in FIGS. 1 and 2.
  • the lever 202 is formed with a slot 202a and a projection 202b.
  • the pivot pin, as at 2b in FIGS. 1 and 2 has been omitted from the drawing only for simplicity.
  • An urging spring as at 4 in the foregoing has been omitted only for the same purpose.
  • the lever 202 is kept in its off-service position shown in FIG. 6.
  • Seconds hand setting lever 209 is pivotably mounted on the base plate 201 by meansof a pivot pin 210 studded thereon, and fitted with a motion-receiving pin 20% which is studded on the setting lever 209 and kept in loose engagement with said slot 202a.
  • Numeral 209a represents the actuating or operating end of the lever 209;
  • a further lever 227 is pivotably mounted through its pivot pin 232 studded on the base plate 201.
  • a spring bend 227C is inserted between the lever 227 and a land 201a on the plate 201, thus the lever. being urged to rotate clockwise in FIG. 6 around its pivot pin 232 and kept stationary by contact of its stop pin 227b with the projection 202b of the motion-transmitting lever 202.
  • an actuating pin 227a is provided on the lever 227.
  • motion-transmitting lever 202 is pivotingly moved as shown by the arrow alpha.
  • the projection 202b collides against the pin 227b, thereby the lever 227 being pivoted counter clockwise in FIG. 6 for disengaging the spring strip 253 from engagement with ratchet wheel 2520.
  • the rotor can continue its steppingly rotational movement without hindrance.
  • the rotor is kept in magnetic coupling with its stator, although the coupled state is variable. It should be noted that the rotor can be driven in either rotational direction, as the case may be, when an appreciable driving torque overcoming said magnetic coupling is applied to the rotor.
  • the seconds hand setting lever 209 is caused, thanks to the pin-and-groove connection 20%; 202a, to make a clockwise pivotal movement around its pivot pin 210 and its operating end 209a is brought into its cooperating contact with the cam 205.
  • the seconds rotor are rotated by gear-meshing between gear 2%];
  • the current motionconverter may exclusive a tuning fork, a piezoelectrical drive means or so for oscillative drive thereof, a feed spring pawl (pallet) mounted on said tuning fork, a number of feeding teeth on a ratchet wheel adapted for engagement with said feed pawl, and a stop pawl pallet) adapted for preventing any reverse motion of the ratchet.
  • the arrangement is so that these stopand feed pawls or pallets may be disengaged so as to bring the ratchet wheel into its freely rotatable state for attaining the same purpose.
  • actuation means operable from the outside of the casing of said watch
  • gear train means coupling said conversion means to said first arbor
  • first cam means of a heart configuration, fixedly attached to said first arbor
  • second cam means of a notched disc configuration, fixedly attached to said second arbor;
  • a first cam control lever means for receiving motion from said motion-transmitting lever means and for cooperating with said first cam means so as to correct said seconds hand to its zero-position and to correct said minute hand to its correct minute indicating position;
  • second cam control lever means for receiving motion from said motion-transmitting lever means and for engaging the notch of said second cam means for correcting said minute hand to its zero-position;
  • lever means responsive to said motion from said motion-transmitting means, thereby stopping said conversion means in its operation and for disconnecting said train means;
  • a resilient means provided in the path of motion transmission extending from said actuating means to said second cam control lever means, for correcting only said first cam in its position when said second cam control lever means engages said second cam at any position other than said notch.
  • motion-transmitting lever means comprises a first and second resilient arm held in pressure engagement with said first and said second cam control lever, respectively.
  • An electronic watch such as set forth in claim 2 wherein said motion converting means comprises a drive balance wheel and an index wheel held in cooperation therewith, wherein said lever means for stopping said motion conversion means and for decoupling said motion conversion means from the gear train, said first cam control lever means and said second cam control lever means are sequentially operated by actuating said actuation means.
  • An electronic watch such as set forth in claim 3, further comprising a series of serrations formed on the periphery of said second cam for correcting said second arbor to the correct minute position.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
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US00314406A 1971-12-13 1972-12-12 Time-setter for an electronic timepiece Expired - Lifetime US3817024A (en)

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Application Number Priority Date Filing Date Title
JP46100825A JPS4881566A (el) 1971-12-13 1971-12-13

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4050234A (en) * 1973-08-30 1977-09-27 Kabushiki Kaisha Suwa Seikosha Electronic timepiece hand-return mechanism
US4234946A (en) * 1977-12-22 1980-11-18 Citizen Watch Co., Ltd. Electronic wristwatches
EP0189893A2 (en) * 1985-01-29 1986-08-06 Casio Computer Company Limited Gear train mechanism stop device of timepiece
US20090147629A1 (en) * 2007-12-07 2009-06-11 Omega S.A. Chronograph control device
EP2221678A1 (fr) * 2009-02-24 2010-08-25 Montres Breguet SA Dispositif de blocage d'un résonateur d'une pièce d'horlogerie
US20110128826A1 (en) * 2009-12-01 2011-06-02 Takanori Hasegawa Chronograph timepiece

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2266791A (en) * 1992-05-08 1993-11-10 George Daniels Improvements relaating to chronographs

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US452424A (en) * 1891-05-19 Electric synchronizing device for clock-hands
GB734618A (en) * 1953-02-03 1955-08-03 Emile Michel Improvements in and relating to a time piece
US3059412A (en) * 1958-11-19 1962-10-23 Hamilton Watch Co Electric watch
GB1018643A (en) * 1962-04-16 1966-01-26 Kokusai Electric Co Ltd Improvements in or relating to time signal corrected timekeeping mechanisms
US3262259A (en) * 1965-02-10 1966-07-26 Bulova Watch Co Inc Time setting mechanism for electronic timepieces
US3597915A (en) * 1968-11-05 1971-08-10 Susumu Aizawa Driving device of electronic watch
US3665698A (en) * 1969-11-22 1972-05-30 Tissot Horlogerie Electromechanical clockwork with decoupling mechanism

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US452424A (en) * 1891-05-19 Electric synchronizing device for clock-hands
GB734618A (en) * 1953-02-03 1955-08-03 Emile Michel Improvements in and relating to a time piece
US3059412A (en) * 1958-11-19 1962-10-23 Hamilton Watch Co Electric watch
GB1018643A (en) * 1962-04-16 1966-01-26 Kokusai Electric Co Ltd Improvements in or relating to time signal corrected timekeeping mechanisms
US3262259A (en) * 1965-02-10 1966-07-26 Bulova Watch Co Inc Time setting mechanism for electronic timepieces
US3597915A (en) * 1968-11-05 1971-08-10 Susumu Aizawa Driving device of electronic watch
US3665698A (en) * 1969-11-22 1972-05-30 Tissot Horlogerie Electromechanical clockwork with decoupling mechanism

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4050234A (en) * 1973-08-30 1977-09-27 Kabushiki Kaisha Suwa Seikosha Electronic timepiece hand-return mechanism
US4234946A (en) * 1977-12-22 1980-11-18 Citizen Watch Co., Ltd. Electronic wristwatches
EP0189893A2 (en) * 1985-01-29 1986-08-06 Casio Computer Company Limited Gear train mechanism stop device of timepiece
US4636087A (en) * 1985-01-29 1987-01-13 Casio Computer Co., Ltd. Gear train mechanism stop device of timepiece
EP0189893B1 (en) * 1985-01-29 1992-09-09 Casio Computer Company Limited Gear train mechanism stop device of timepiece
US20090147629A1 (en) * 2007-12-07 2009-06-11 Omega S.A. Chronograph control device
US8235584B2 (en) * 2007-12-07 2012-08-07 Omega S.A. Chronograph control device
EP2221678A1 (fr) * 2009-02-24 2010-08-25 Montres Breguet SA Dispositif de blocage d'un résonateur d'une pièce d'horlogerie
US20110128826A1 (en) * 2009-12-01 2011-06-02 Takanori Hasegawa Chronograph timepiece
US8540417B2 (en) * 2009-12-01 2013-09-24 Seiko Instruments Inc. Chronograph timepiece

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DE2261622A1 (de) 1973-06-14
GB1410208A (en) 1975-10-15
JPS4881566A (el) 1973-10-31

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