System for making-up steps lost by the motor of a time-piece

Details System for making-up steps lost by the motor of a time-piece System for making-up steps lost by the motor of a time-piece

1978-12-13

1981-11-10

Truhe, J. V.

Horology: time measuring systems or devices

Chronological

With pulse transforming means

368217, 318696, G04C 1900, G04C 300, G04C 500, G05B 1940

Patent

active

043002234

ABSTRACT:
The present invention concerns a time-piece comprising a system for detecting the non-rotation of a stepping motor and for making-up lost steps.
The detection system comprises a device for measuring the current delivered to the motor, the logic level of the measured signal being used for controlling a correction circuit delivering additional pulses to the stepping motor. The measuring device comprises a short duration measuring pulse generator, a reference signal source, and a comparator having an output which controls the correction circuit.

REFERENCES:
patent: 3553957 (1971-01-01), Dome et al.
patent: 3750000 (1973-07-01), Bruckner et al.
patent: 4032827 (1977-06-01), Dobratz et al.
patent: 4074179 (1978-02-01), Kuo et al.
patent: 4212156 (1980-07-01), Kawamura et al.

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