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Patent Searching and Data


Title:
MONTH END AUTOMATIC CORRECTING WATCH
Document Type and Number:
Japanese Patent JPS5498666
Kind Code:
A
Abstract:

PURPOSE: To perform month end correction automatically by driving a step motor for date dial via calendar memory circuit and control circuit according to the information signal at 0.00 AM based on day dial driving signal.

CONSTITUTION: The signal from the day dial driving device 202e in a time information holding mechanism 202 is detected with the zero hour detecting part 206a of a zero hour signal making device 206 and through its mechanical and electrical processing, an electrical zero hour signal maing part 206c outputs the information signal at 0:00 AM, which is then applied to a calendar memory circuit 205 and the day feed signal making circuit 206 of a control circuit 206. This causes a step motor 207 for date dial to be stepped by way of the driving circuit 206g of the circuit 206, causing a date dial 208 to turn. When the end month judging circuit 206c of the circuit 206 detects the end of odd and even months according to the count values of a calendar 205a, month-year calendars 205b, 205c, the count values of counters 205a thru 205c are renewed and the step motor 207a is turned by the driving signal from the circuit 206g, whereby the month end correction is automatically accomplished.


Inventors:
Nitta, Tatsuo
Application Number:
JP1977000156436
Publication Date:
August 03, 1979
Filing Date:
December 27, 1977
Export Citation:
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Assignee:
CITIZEN WATCH CO LTD
International Classes:
G04C3/14; G04B19/253; G04C3/00; G04C9/00; G04C17/00; (IPC1-7): G04B19/24; G04C3/00; G04C9/00