Positioning mechanism for a center wheel
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United States of America Patent
Stats
-
Oct 11, 1983
Grant Date -
N/A
app pub date -
Nov 12, 1980
filing date -
Nov 16, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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