Time-keeping apparatus

Details Time-keeping apparatus Time-keeping apparatus

1975-10-09

1977-07-19

Weldon, Ulysses

Oscillators

Relaxation oscillators

58 23A, 58 28R, 331116M, G04C 300

Patent

active

040360067

ABSTRACT:
A time-keeping apparatus uses a crystal oscillator and electronic frequency dividers, as well as an electronically regulated mechanical time-keeping system (balance wheel system) which is part of an indicating system. The indicating system is driven at at least two different rpm's; at least one of these rpm's is effectively controlled to be higher and at least one of these rpm's can be controlled to be lower than a nominal rpm corresponding to the frequency of oscillation of the crystal oscillator, which may be of quartz. A storage circuit, in the form of a bistable multivibrator, has one input coupled to an output of a frequency divider which, in turn, is controlled by the output from the crystal oscillator. The other input to the storage circuit is provided with input pulses derived from the indicating system or from the electronically controlled mechanical time-keeping system, which have very nearly the same frequency as the pulses of the output of the frequency divider fed from the crystal oscillator. The output from the bistable multivibrator is coupled, via a switching circuit, to the electronically controlled balance wheel system.

REFERENCES:
patent: 3597634 (1971-08-01), Flaig
patent: 3711754 (1973-01-01), Nemoto
patent: 3807164 (1974-04-01), Zaisky et al.

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