JPS5479661A - Calendar watch - Google Patents

Abstract

PURPOSE: To eliminate the need for manual correction of the date at the month ends including those of even months, February of leap years and February of common yeats by displaying the months for the years of integer times of 4 in the month display member of the calender watch.

CONSTITUTION: The output of a reference signal source 1 is divided down by an electrical counting means 2. The positive direction driving pulse outputs of 1 Hz for watch are entered to a switching means 4 and the outputs of 64 Hz to an auxiliary signal forming means 3. The means 3 forms the negative direction driving pulses for reversing the time for 2 and half hours and the positive direction driving pulses for advancing the same for 2 and half hours and for the time having deviated from the normal time for correction of the calender and applies the same to the means 4. The means 4 drives a wheel train 6 by way of an electro-mechanical transducer 5 which revolves forward or backward depending upon the driving pulse directions. The wheel train 6, to part of which is provided the hand 7, drives day and date display mechanisms 9,8. The mechanism 8 moves a month display mechanism 10. Date display means for 4 years are included in the mechanism 10 and the dates for one years among these correspond to those of a leap year. Further a year and month discriminating means 11 for odd months, even months, leap dates, common February end, etc. is provided. The means 4 is switched by the means 11.

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