Horology: time measuring systems or devices – With calendar indicator
Patent
1999-02-12
2000-07-11
Miska, Vit
Horology: time measuring systems or devices
With calendar indicator
368 37, G04B 1924
Patent
active
060883014
ABSTRACT:
A timepiece has a gear train having a plurality of intermeshed gears including a 24 o'clock wheel. To avoid error, the phase angle of the 24 o'clock wheel at which a given detection state is assumed is equal to the phase angle of backlash of the gear train between forward and reverse rotations of the 24 o'clock wheel. An electrically conductive contact spring is mounted to the 24 o'clock wheel. A circuit board is provided with electrical contacts disposed to come into contact with the contact spring when rotated. A 24 o'clock detection circuit is connectd to the electrical contacts to input an angular position detection signal indicating the angular position of the 24 o'clock wheel when the contact spring contacts a respective one of the electrical contacts. The electrical contacts include first and second contacts spaced from each other on the circuit board to come into contact with the contact spring at different times during rotation of the contact spring to produce angular position detection signals for detecting the angular position of the 24 o'clock wheel.
REFERENCES:
patent: 4060977 (1977-12-01), Rochat
patent: 4282592 (1981-08-01), Miyasaka
patent: 4320476 (1982-03-01), Berney
patent: 5903519 (1999-05-01), Takahashi et al.
Miska Vit
Seiko Instruments Inc.
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