Analog watch having two motors and comprising means for perpetua

Details Analog watch having two motors and comprising means for perpetua Analog watch having two motors and comprising means for perpetua

1987-10-01

1988-10-04

Roskoski, Bernard

Horology: time measuring systems or devices

With calendar indicator

Winding and setting

368 34, 368 28, 368204, G04B 1924

Patent

active

047759631

ABSTRACT:
The watch has a first motor for driving a time display, a second motor for driving a numerical indicator of the day of the month, a perpetual-calendar circuit, a first transmission circuit, a non-volatile memory, a second transmission circuit, an initialization circuit and a detection circuit for generating a signal when the cell that energizes the circuit is being replaced. The calendar circuit includes day, month, and year counters. The contents of the month and year counters are transferred to the non-volatile memory by the first transmission circuit in response to periodic signals. The date on which the watch stops at the end of the cell's life is memorized by the day of the month indicating means and the non-volatile memory. Upon insertion of a new cell and in response to the detection signal, the contents of the non-volatile memory are transferred into the month and year counters by the second transmission circuit. The day counter is put into agreement with the day of the month indicator upon date setting the watch with the aid of the initialization circuit.

REFERENCES:
patent: 4300222 (1981-11-01), Nitta
patent: 4695168 (1987-09-01), Meister et al.
Patent Abstracts of Japan, vol. 7, No. 127 (P-201)[1272], 3 juin 1983; and JP-A-58 45 589 (Chino Seisakusho K.K.) 16-03-1983.
Patent Abstracts of Japan, vol. 2, No. 106, 31 auot 1978, p. 5563 E 78; and JP-A-53 70 866 (Daini Seikosha K.K.) 23-06-1978.

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