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US3744234A
Expired / Lapsed
US
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Electronic timepiece with positionable rotor
Assignee: Suwa Seikosha KK
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Filing: 1972-02-25
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Granted: 1973-07-10
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Expires: 1992-02-25
Abstract
Abstract In an electronic timepiece, the rotor bears, in addition to the usual pinion gear, a cam. Pulling the watch stem outward makes it possible to stop the rotor as well as the second hand of the timepiece which is connected to the rotor, at a pre-selected position by means of the cam. Pushing the stem inward restarts the rotor. In this way, the second hand can be synchronized with an external time signal. The stator has a plurality of functions, making it possible to reduce the size of such timepieces.
Inventors
- 👤 N Kamijo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:06
CPC Classifications
G; G04; G04C; G04C3/00; G04C3/14; G04C13/00; G04C13/08; G04C13/10; G04C13/11
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
211 words
An electronic timepiece comprising driving circuitry for generating pulses alternating in polarity at pre-selected intervals, a stator connected to said circuitry for receiving said pulses, a rotor within said stator and rotatable at a preselected rate by said stator in response to said pulses, a positioning cam mounted on said rotor for moving said rotor to and holding said rotor at a pre-selected position, a positioning lever for stopping said cam at a pre-selected position, said positioning lever being pivotedly mounted on said stator, a stem slidable exteriorly of said timepiece in an axial direction toward and from the interior of said timepiece, and spring means urging said positioning lever toward said positioning cam, said positioning lever being so related to said stem and said driving circuitry, that movement of said stem from the interior of said timepiece allows said spring means to move said positioning lever into contact with said cam, halting said rotor in a preselected position and simultaneously disconnecting said circuitry and stopping the production of driving pulses, and moving said stem toward the interior of said timepiece disengages said positioning lever from said cam thereby eliminating the constraint of said rotor from rotating and reconnecting said driving circuitry for the production of pulses for driving said rotor.
Claim 2
Dependent Claim
211 words
An electronic timepiece comprising driving circuitry for generating pulses alternating in polarity at pre-selected intervals, a stator connected to said circuitry for receiving said pulses, a rotor within said stator and rotatable at a preselected rate by said stator in response to said pulses, a positioning cam mounted on said rotor for moving said rotor to and holding said rotor at a pre-selected position, a positioning lever for stopping said cam at a pre-selected position, said positioning lever being pivotedly mounted on said stator, a stem slidable exteriorly of said timepiece in an axial direction toward and from the interior of said timepiece, and spring means urging said positioning lever toward said positioning cam, said positioning lever being so related to said stem and said driving circuitry, that movement of said stem from the interior of said timepiece allows said spring means to move said positioning lever into contact with said cam, halting said rotor in a preselected position and simultaneously disconnecting said circuitry and stopping the production of driving pulses, and moving said stem toward the interior of said timepiece disengages said positioning lever from said cam thereby eliminating the constraint of said rotor from rotating and reconnecting said driving circuitry for the production of pulses for driving said rotor.
Claim 3
Dependent Claim
65 words
The electronic timepiece as defined in claim 1, wherein said stem has a third gear mounted thereon and said timepiece has therein a back-gear train on which are mounted the minute and hour hands of said timepiece, said third gear engaging said backgear train for setting said minute and hour hands only when said stem is in outwardly-moved position and said driving circuitry is disconnected.
Claim 4
Dependent Claim
29 words
The electronic timepiece as defined in claim 1, wherein said cam has three lobes, thereby making it possible to stop and hold said rotor in any of three positions.
Claim 5
Dependent Claim
114 words
The electronic timepiece as defined in claim 1, further comprising an axially-slidable stem, a positioning lever, a pin and a sleeve insulator, said lever being pivotedly mounted on and having electrical continuity with said stator, said stator having an aperture in which is firmly fixed said sleeve insulator, said pin being fixed in said sleeve, said electronic circuitry being connected by one lead to said stator and by a second lead to said pin, the relationship among said lever, stem and pin being such that outward movement of said stem bring said lever into mechanical and electrical contact with said pin thereby completing a circuit which halts the generation of pulses by said circuitry.
Claim 6
Dependent Claim
64 words
An electronic timepiece as defined in claim 1 comprising driving circuitry for generating pulses alternating in polarity at pre-selected intervals, a stator connected to said circuitry for receiving said pulses, a rotor within said stator and rotatable at a pre-selected rate by said stator in response to said pulses, said stator serving as base means for the support of other comPonents of said timepiece.
Claim 7
Dependent Claim
83 words
The electronic timepiece as defined in claim 1, wherein said rotor has thereon a first pinion gear and said timepiece has a second pinion gear meshing with said rotor pinion, said second gear having an axle on which is mounted the second hand of said timepiece, thereby making it possible to halt said second hand at a pre-selected position by outward movement of said stem, and to restart said second hand in synchronization with an external signal by inward movement of said stem.
Claim 8
Dependent Claim
60 words
The electronic timepiece as defined in claim 6, wherein said electronic circuit generates one pulse per second and said rotor has three south and three north magnetic poles in alternating sequence, the positioning of said second hand in relationship to said rotor and positioning cam being such that said second hand can be stopped at any even-numbered second including zero.
References Cited (Backward Citations)
US3432699A
Cited
US3614492A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |