Timepiece driven by a source of mechanical energy and regulated

Details Timepiece driven by a source of mechanical energy and regulated Timepiece driven by a source of mechanical energy and regulated

1995-04-07

1996-05-14

Roskoski, Bernard

Horology: time measuring systems or devices

Mechanical time base

Mainspring

368155, 368157, 368203, 322 29, H02P 904

Patent

active

055174698

ABSTRACT:
The hands of the timepiece are connected to a barrel spring which also drives the rotor of a generator at a speed greater than a desired speed Vc. The electric energy supplied by the generator energizes a slaving circuit that includes a transistor which short-circuits the coil of the generator and thus brakes the rotor down to a speed less than the desired speed Vc when a comparator indicates that this rotor is ahead with respect to its theoretical angular position. A limiting circuit limits the duration of the braking action of the rotor to a fraction of the period of the a.c. voltage supplied by the generator. This arrangement ensures that the slaving circuit is adequately energized even if the rotor is substantially ahead.

REFERENCES:
patent: 3807164 (1974-04-01), Zaisky et al.
patent: 3937001 (1976-02-01), Berney
patent: 3952497 (1976-04-01), Schulz et al.
patent: 4169992 (1979-10-01), Nash
patent: 4214434 (1980-07-01), Sutter
patent: 4361409 (1982-11-01), Sutter
patent: 4799003 (1989-01-01), Tu et al.

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