Electronic timepiece hand-return mechanism

Details Electronic timepiece hand-return mechanism Electronic timepiece hand-return mechanism

1974-08-30

1977-09-27

Weldon, Ulysses

58 23R, 58 34, G04B 2708

Patent

active

040502341

ABSTRACT:
A hand-return mechanism for an electronic timepiece wherein at least one hand is returned to a predetermined position and the motor rotating same is correspondingly adjusted. The timepiece includes a display hand mechanically coupled to a positionable gear, the rotational position of the gear determining the rotary position of the hand. An oscillator circuit produces a high frequency time standard signal and a divider circuit produces an alternating polarity pulse of a predetermined low frequency in response to the high frequency time standard signal. An electro-mechanical converter is adapted to rotate the gear by means of a rotor in response to the period of the alternating polarity pulse applied thereto. A manually operated reset mechanism is adapted to be displaced from a rest position to a reset position, the reset mechanism being mechanically coupled to the gear and electrically coupled to the divider circuit, the resetting mechanism effecting a mechanical positioning of said gear and rotor to a predetermined position and a resetting of the divider circuit to stop and then restart the electro-mechanical converter in coordination with the position of said rotor upon the return of the manually operated reset mechanism to a rest position which releases the gear.

REFERENCES:
patent: 3059412 (1962-10-01), Epperlein
patent: 3129554 (1964-04-01), Yasukawa
patent: 3691753 (1972-09-01), Kurita
patent: 3744234 (1973-07-01), Kamijo
patent: 3762153 (1973-10-01), Komiyana et al.
patent: 3813873 (1974-06-01), Nakagawa
patent: 3817024 (1974-06-01), Noguchi

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