Correcting device for calendar in an analog type electronic watc

Details Correcting device for calendar in an analog type electronic watc Correcting device for calendar in an analog type electronic watc

1978-10-05

1981-06-02

Weldon, Ulysses

Horology: time measuring systems or devices

With calendar indicator

Setting or resetting

368 28, 368202, G04B 1924

Patent

active

042714940

ABSTRACT:
A calendar mechanism of a motor driven analog timepiece is automatically adjusted, at the end of a 30-day month to the first day of the next month. A month detecting circuit distinguishes between 30-day months and 31-day months, and at the end of the 30th day of a 30-day month it controls the timepiece motor to run backward and then forward at a relatively high speed to change the calendar to the first day of the month. Circuitry is also provided to distinguish between 28 and 29-day months, and to correct the date displayed at the end of February in a similar manner.

REFERENCES:
patent: 3518825 (1970-07-01), Nissen
patent: 3827234 (1974-08-01), Imanishi
patent: 4026100 (1977-05-01), Kume et al.
patent: 4142363 (1979-03-01), Guyot et al.

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