Positioning mechanism for a center wheel

Details Positioning mechanism for a center wheel Positioning mechanism for a center wheel

1980-11-12

1983-10-11

Roskoski, Bernard

Horology: time measuring systems or devices

Display trains

368228, 368185, G04B 1902

Patent

active

044088981

ABSTRACT:
The invention provides a positioning mechanism for a center wheel in a tiiece enabling precision positioning for the seconds or minutes hand relative to the dial divisions. It comprises a jumper spring (1) friction mounted onto the base plate and cooperating with the teeth (3) of the center wheel (4) and a wheel member (29) interposed between the center wheel (4) and the motor pinion (14). The wheel member includes a pinion (17) meshing with the center wheel as well as a gear (16) friction mounted relative to said pinion and meshing with the motor pinion. The positioning method consists of immobilizing the motor pinion then turning the center wheel to bring the end of the jumper spring into coincidence with a tooth space thereof. The invention is employed to position exactly the seconds or minutes hand of an electronic timepiece having a stepping motor.

REFERENCES:
patent: 2766578 (1956-10-01), Robert-Charrue
patent: 3487633 (1970-01-01), Wuthrich
patent: 3691753 (1972-09-01), Kurita
patent: 3783608 (1974-01-01), Miyazawa

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