Wristwatch

Details Wristwatch Wristwatch

1986-07-25

1987-06-09

Miska, Vit M.

Horology: time measuring systems or devices

With calendar indicator

Movable ring or disk

G04B 1924

Patent

active

046716700

ABSTRACT:
The operating mechanism for a watch indicating arrangement, especially for a date indicating structure of an electrically operated wristwatch provided with an indicating element which is advanced periodically and operated by a drive mechanism associated with the watch, the operating mechanism includes a non-uniform transmission gear structure with a driving and a driven gear which have at least one engagement mode in which the non-uniform rotational speed of the driven gear is relatively low while the available torque is relatively high and the driven gear has associated therewith means for engaging the indicating structure for advancing the indicating element a predetermined step with each revolution of the driven gear wherein the means for engaging the indicating element are so arranged that engagement of the indicating element for its advance takes place while the non-uniform transmission is in the highest torque providing engagement mode.

REFERENCES:
patent: 4136514 (1979-01-01), Rochat
patent: 4271493 (1981-06-01), Tamaru et al.

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