Date driving mechanism of watch

Details Date driving mechanism of watch Date driving mechanism of watch

1979-06-19

1981-04-07

Smith, Jr., David

Horology: time measuring systems or devices

With calendar indicator

Movable ring or disk

368 37, G04B 1924, G04B 1920

Patent

active

042610478

ABSTRACT:
The date driving mechanism of a watch comprises a date driving wheel having a partially teethed portion engaged with teeth of a calendar driving wheel which in turn drives a calendar display dial so as to advance the calendar display dial a given amount each rotation of the date driving wheel. A cam integral with the date driving wheel engages a pivotal control member so as to hold the control member against the calendar driving wheel normally to restrain movement of the date dial. The cam has a flat side so as to release the calendar driving wheel from restraint when being driven by the teethed portion of the date driving wheel, thereby relieving load on the date driving wheel. The control member has a resilient arm which yields to permit manual correction of the calendar display.

REFERENCES:
patent: 3667211 (1972-06-01), Schneider
patent: 4081950 (1978-04-01), Chappatte

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