Hand rotating mechanism for electronic watch

Details Hand rotating mechanism for electronic watch Hand rotating mechanism for electronic watch

1995-12-19

1998-05-12

Roskoski, Bernard

Horology: time measuring systems or devices

Time interval

Electrical or electromechanical

368 28, 368124, 368 76, G04B 1500

Patent

active

057516642

ABSTRACT:
In an electronic watch, a hand wheel gear 109b in a gear train has a tooth 124 having a profile K so as to prevent the backward movement of a hand 104. During initialization, the gear train is rotated backward such that the hand 104 is turned to the backward movement preventing position, which serves as an initializing position, and a reference position during detection of a hand position. Usually, a backward movement command is issued when the hand 104 is supposed to be at the reference position. The hand 104 is judged to be out of the reference position when its backward movement is detected.

REFERENCES:
patent: 4108016 (1978-08-01), Muranishi
patent: 5235562 (1993-08-01), Vaucher
patent: 5305289 (1994-04-01), Besson et al.
patent: 5481188 (1996-01-01), Mizutani

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