1977-09-30
1980-02-19
Miska, Vit W.
58 58, G04B 1924
Patent
active
041887743
ABSTRACT:
A device for automatically correcting the date indicator of an electro-mechanical timepiece to the first date of the next month at the end of each month. A pulse driven motor advances the date indicator one date in response to a plurality of pulsed drive signals with the motor advancing one step for each drive signal pulse, and at a speed corresponding to the drive signal frequency. A fixed number of drive signal pulses are applied to the motor each month to advance the date indicator through the dates of each month to the first date of the next month. A predetermined number of the drive signal pulses, corresponding to the number of dates of each month, are applied to the motor at a normal advance frequency normally to advance the date indicator. The remaining number of the drive signal pulses, for each month having less than 31 days are applied to the motor at a rapid advance frequency which is greater than the normal advance frequency, rapidly to advance the date indicator and indicate the first date of the next month.
REFERENCES:
patent: 3477222 (1969-11-01), Leung et al.
patent: 3681913 (1972-08-01), Solari
patent: 3733803 (1973-05-01), Hiraga et al.
patent: 3827234 (1974-08-01), Imanishi
patent: 3834151 (1974-09-01), Bodet
patent: 3992868 (1976-11-01), Tamaru et al.
patent: 4026100 (1977-05-01), Kume et al.
patent: 4059953 (1977-11-01), Morrison et al.
patent: 4092820 (1978-06-01), Kume et al.
Ebauches S.A.
Miska Vit W.
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