Annual calendar mechanism for clockwork movement

Details Annual calendar mechanism for clockwork movement Annual calendar mechanism for clockwork movement

1999-09-10

2000-08-22

Miska, Vit

Horology: time measuring systems or devices

With calendar indicator

368 37, G04B 1924

Patent

active

061082783

ABSTRACT:
An annual calendar mechanism including a date-disc provided with a first inner toothing including thirty one teeth, and a date drive wheel and pinion, said wheel and pinion including a finger capable of driving said date-disc through one step once a day, characterized in that the date-disc includes a second inner toothing provided for driving, via a gear train, a month-cam carrying at least five teeth, each of these teeth being arranged to be situated, at the end of the months of less than thirty one days, on the path of the beak of a lever and in that said lever carries a correction drive wheel and pinion fitted with a correction finger co-operating with the first or second toothing at the end of the aforecited months to drive the date-disc through one additional step at the end of said months when the lever pivots following the passage of its beak over a tooth of said cam.

REFERENCES:
patent: 3673789 (1972-07-01), Tsuzuki et al.
patent: 3716983 (1973-02-01), Tanaka et al.
patent: 3827234 (1974-08-01), Imanishi
patent: 4182109 (1980-01-01), Teramoto
patent: 4228644 (1980-10-01), Watanabe et al.

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