US3597915A - Driving device of electronic watch - Google Patents

Driving device of electronic watch Download PDF

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Publication number
US3597915A
US3597915A US873224A US3597915DA US3597915A US 3597915 A US3597915 A US 3597915A US 873224 A US873224 A US 873224A US 3597915D A US3597915D A US 3597915DA US 3597915 A US3597915 A US 3597915A
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United States
Prior art keywords
rotor
stepping motor
wheel
indexing
motor means
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Expired - Lifetime
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US873224A
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English (en)
Inventor
Susumu Aizawa
Yoshifumi Gomi
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Individual
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Individual
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    • 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

Definitions

  • gag WATCH ABSTRACT A driving device for an electronic timepiece inu eluding a multipole stepping motor driven by an alternative [52] US. Cl. 58/23 D, pulse generator operating under the control of a time standard 310/83 oscillator.
  • the timepiece includes a time indicating gear train [5
  • G04c 3/00 including an indexing mechanism having a pawl and a ratchet [50] Field olSearch 58/23, 23 wheel attached to the second wheel of said train to insure the D, 26.5, 26.6, 27; 3 l0/83 incremental step action of said stepping motor.
  • the object of this invention is in an inductance-type step motor containing a permanent magnet in its rotor, to reduce the vibration that disturbs the norr'nalrotation of the rotor occurring after each step rotation, which has been a defect of the step motor.
  • Another object of this invention is to decrease the electric power consumption considerably. Namely, in using the step motor as a converter for electronic watches such as a quartz watch, especially a wrist watch controlled by-quartz crystal, it
  • furtherobject of the invention isto eliminate the fluctuation of the second hand and to stop the second hand precisely in a predetermined position.
  • FIG. I is adrawing which shows a step motor hitherto used
  • FIG. 2 is a drawing in'which an indexing mechanism is addedtothestep motorshown in FIG. I;
  • FIG; 3 to FIG. 8 aredrawings which show characteristics of a step motor
  • FIG. 9 is a drawing which shows an embodiment of step 'motor according .to this invention.
  • cDESCRIP'lION OF THE PREFERRED EMBODIMENTS In the construction of ahitherto-used motor without an indexing mechanism shown in FIG. 1, l, and 2are stators, 3 is a driving coil, 4 is a rotor comprising at least one permanent .magnet having at its periphery a series of alternate North and Southmagnetic poles, and 5 is a rotating shaft of the rotor 4. As shown in the figure, the stators l, 2 areal-ranged eccentrically'and determine the rotating direction of the rotor 4.
  • the rotor 4 In the absence of current through the coil 3, the rotor 4 is stably at rest at a position with an inclination at 2 from the center line A-A' of the stators l, 2 (to be called a statically stable posi-' rotor, it is assumed that the poles 1, 3, '5 of the rotor are N- polesand the poles 2, 4, 6 are S-poles. If a pulsive current is applied on the driving coil 3 in such a way that the stator l and the stator 2 are magnetized to be N-pole and S-pole respectively, the rotor 4' is rotated counterclockwise from its statically stable position and stabilized at a position of 13 from the centerline A-A' (to be called a magnetically stable position hereafter).
  • the a reverse impulse is applied, the rotor 4 is learning to continue a step rotation in one direction.
  • FIG. 5 shows a graph obtained from an experimental investigation about the action of the rotor 4. Namely, taking the voltage on the ordinate and the time (t) of actuating the driving coil 3 on the abscissa,is the region'where the rotor 4 makes one-step rotation accurately;is the region where the rotor 4 makes two-step rotation at one time, which occurs due to the fact that the pulse'is cut off before the braking force for the rotation of the rotor is not applied or not sufficiently applied;'is the region where the rotor 4 makes rotation by one step because the braking force is applied well;fi)is the region where an instability appears due to the vibration of the rotor 4, in which the rotor 4 may sometimes return to its original position due to its own vibration; andis the region where the vibration of the rotor 4 becomes stable in a magnetically stable position to be steadily shifted byone step.
  • FIG. 2 a construction in which to the construction shown in FIG. 1 an indexing mechanism is added, wherein a ratchet wheel 16 is mounted coaxially on a rotor shaft and also a reversed rotation preventing spring 17 is provided.
  • the action of the rotor becomes quite'different from that in FIG. 1 owing to the installation of the indexing device.
  • FIG. 7 gives a waveform of current induced in a driving coil 13 in which the aspect that the vibration of the rotor 4 is shown. From this figure it is seen that, even in the region@) shown in FIG. 5, the rotor 4 does not vibrate and steadily makes its action by one step. Namely, in the construction of FIG. 2 it makes possible to use at any position in the regions@ @Qenabling the driving pulse width to be reduced to a large extentwith decrease of the consumed electric power.
  • the minimum pulse width is 45 msec. and the electric power consumption amounts to a l5p.w. necessarily, while in the construction shown in FIG. 2, it is possible to reduce the minimum pulse width to 18 msec.
  • rotor pinion 28 is mounted on a rotating shaft 25 that is coaxial with arotor 24, and a large toothed wheel 30 engaged with the second hand 29 is attached; i v
  • the rotor24 is provided with 3 pairs of poles and the ratio of the rotation-of the rotating shaft 25 of the rotor 24 to that of 7 the pinion28 is mounted on a second hand shaft 33 on which n large toothed wheel 30 and the rotor pinion 28, so that the vibration that damages the step action of the rotor 24 can be prevented.
  • Such an aspect may be understood from the waveform of current induced by the driving coil shown in FIG. 8 by the fact that comparing to the waveform induced by the driving coil 3 in the construction of FIG. I, the harmful vibration in the rotor 24 is reduced. Consequently, by applying on the driving coil 23 reverse pulses in which thedirection of-current changes alternately in correspondence with the'output of the time standard generator once a second for a very short time, the second hand can rotate precisely at intervals of l sec. with a slight consumption of electric power.
  • a driving device for an electronic timepiece comprising a time standard oscillator; an alternative pulse generator for generating periodical alternative pulses under the control of said time standard oscillator; stepping motor means operatively coupled to said alternative pulse generator; saids tepping motor means including a stepping rotor havingat its periphery a series of more than two pairs of alternate N and S magnetic poles and a stator having at least two pairs of poles, said stator being arranged coaxially with said rotor, said stepping motor means being adapted to produce alternative polarities on said stator poles to provide a rotating force in one direction on said rotor for the stepwise rotation of said rotor in one direction in response to the output of saidalternative pulse generator; and
  • gear train means including a second wheel, means for rotating said second wheel in response to thestepwise rotation of said stepping motor means rotor, and indexing means, said indexing means including a ratchet wheel secured to said second wheel and an indexing pawl in cooperative engagement with said ratchet wheel for controlling the stepwise rotation of said second wheel and stepping motor means rotor.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Stepping Motors (AREA)
  • Electromechanical Clocks (AREA)
US873224A 1968-11-05 1969-11-03 Driving device of electronic watch Expired - Lifetime US3597915A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8051468 1968-11-05

Publications (1)

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US3597915A true US3597915A (en) 1971-08-10

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US873224A Expired - Lifetime US3597915A (en) 1968-11-05 1969-11-03 Driving device of electronic watch

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US (1) US3597915A (xx)
CH (1) CH1639069A4 (xx)
DE (2) DE1955698B2 (xx)
GB (1) GB1232907A (xx)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3731125A (en) * 1970-06-13 1973-05-01 Citizen Watch Co Ltd Pulse motor for time piece
US3766729A (en) * 1971-03-24 1973-10-23 Timex Corp Quartz controlled chronometer
US3783608A (en) * 1971-02-17 1974-01-08 Suwa Seikosha Kk Indexing device for a step motor in an electronic timepiece
US3817024A (en) * 1971-12-13 1974-06-18 Citizen Watch Co Ltd Time-setter for an electronic timepiece
US3902312A (en) * 1970-07-27 1975-09-02 Suwa Seikosha Kk Quartz crystal wrist watch
DE2509883A1 (de) * 1974-03-07 1975-09-11 Seiko Instr & Electronics Elektrischer schrittmotor
DE2514802A1 (de) * 1974-04-04 1975-10-16 Suwa Seikosha Kk Elektro-mechanischer wandler
US3937003A (en) * 1973-11-28 1976-02-10 Vdo Adolf Schindling Ag Electric clock
US3969642A (en) * 1973-07-17 1976-07-13 Kabushiki Kaisha Suwa Seikosha Step motor for electronic timepiece
DE2615123A1 (de) * 1975-04-07 1976-10-21 Seiko Koki Kk Antriebseinrichtung fuer eine elektrische uhr
US3989967A (en) * 1974-08-12 1976-11-02 Citizen Watch Co., Ltd. Pulse motor
DE2620735A1 (de) * 1975-05-16 1976-11-25 Seiko Instr & Electronics Elektromagnetischer wandler fuer eine elektrische uhr
US4048548A (en) * 1975-09-27 1977-09-13 Citizen Watch Company Limited Stepping motor
USRE29403E (en) * 1970-07-27 1977-09-20 Kabushiki Kaisha Suwa Seikosha Quartz crystal wrist watch
US4088909A (en) * 1977-02-18 1978-05-09 Kanto Seiki Company, Limited Stepping motor for timekeeping mechanism
US4144467A (en) * 1973-11-30 1979-03-13 Citizen Watch Co., Ltd. Pulse motor
US4329601A (en) * 1979-03-01 1982-05-11 Societe Suisse Pour L'industrie Horlogere Management Services S.A. Stepping motor
US5734210A (en) * 1995-01-11 1998-03-31 Vdo Adolf Schindling Ag Indicating device

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2166739B2 (de) * 1971-06-24 1981-11-05 Kabushiki Kaisha Suwa Seikosha, Tokyo Quarzkristall-Armbanduhr mit einem elektromechanischen Wandler
CH1372372A4 (xx) * 1972-09-20 1976-09-15
DE2713488A1 (de) * 1977-03-26 1978-10-05 Kieninger & Obergfell Elektrische uhr
DE2913159A1 (de) * 1979-04-02 1980-10-23 Vdo Schindling Elektrische uhr, insbesondere batteriebetriebene quarzuhr

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2988868A (en) * 1955-12-15 1961-06-20 Leon Hatot Ets Electronic time-measuring arrangement
US3250066A (en) * 1963-08-12 1966-05-10 Philco Corp Electronic clock utilizing oscillator to switch bistable circuit at subharmonic of oscillator frequency

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2988868A (en) * 1955-12-15 1961-06-20 Leon Hatot Ets Electronic time-measuring arrangement
US3250066A (en) * 1963-08-12 1966-05-10 Philco Corp Electronic clock utilizing oscillator to switch bistable circuit at subharmonic of oscillator frequency

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3731125A (en) * 1970-06-13 1973-05-01 Citizen Watch Co Ltd Pulse motor for time piece
US3902312A (en) * 1970-07-27 1975-09-02 Suwa Seikosha Kk Quartz crystal wrist watch
USRE29403E (en) * 1970-07-27 1977-09-20 Kabushiki Kaisha Suwa Seikosha Quartz crystal wrist watch
US3783608A (en) * 1971-02-17 1974-01-08 Suwa Seikosha Kk Indexing device for a step motor in an electronic timepiece
US3766729A (en) * 1971-03-24 1973-10-23 Timex Corp Quartz controlled chronometer
US3817024A (en) * 1971-12-13 1974-06-18 Citizen Watch Co Ltd Time-setter for an electronic timepiece
US3969642A (en) * 1973-07-17 1976-07-13 Kabushiki Kaisha Suwa Seikosha Step motor for electronic timepiece
US3937003A (en) * 1973-11-28 1976-02-10 Vdo Adolf Schindling Ag Electric clock
US4144467A (en) * 1973-11-30 1979-03-13 Citizen Watch Co., Ltd. Pulse motor
DE2509883A1 (de) * 1974-03-07 1975-09-11 Seiko Instr & Electronics Elektrischer schrittmotor
DE2514802A1 (de) * 1974-04-04 1975-10-16 Suwa Seikosha Kk Elektro-mechanischer wandler
US3984972A (en) * 1974-04-04 1976-10-12 Kabushiki Kaisha Suwa Seikosha Transducer for quartz crystal timepiece
US3989967A (en) * 1974-08-12 1976-11-02 Citizen Watch Co., Ltd. Pulse motor
DE2615123A1 (de) * 1975-04-07 1976-10-21 Seiko Koki Kk Antriebseinrichtung fuer eine elektrische uhr
DE2620735A1 (de) * 1975-05-16 1976-11-25 Seiko Instr & Electronics Elektromagnetischer wandler fuer eine elektrische uhr
US4048548A (en) * 1975-09-27 1977-09-13 Citizen Watch Company Limited Stepping motor
US4088909A (en) * 1977-02-18 1978-05-09 Kanto Seiki Company, Limited Stepping motor for timekeeping mechanism
US4329601A (en) * 1979-03-01 1982-05-11 Societe Suisse Pour L'industrie Horlogere Management Services S.A. Stepping motor
US5734210A (en) * 1995-01-11 1998-03-31 Vdo Adolf Schindling Ag Indicating device

Also Published As

Publication number Publication date
CH1639069A4 (fr) 1973-11-30
GB1232907A (xx) 1971-05-26
DE6943040U (de) 1970-04-30
DE1955698A1 (de) 1970-08-06
DE1955698B2 (de) 1973-03-08

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