Horology: time measuring systems or devices – Electrical time base – Solid state oscillating circuit type
Patent
1993-04-27
1995-03-21
Roskoski, Bernard
Horology: time measuring systems or devices
Electrical time base
Solid state oscillating circuit type
368160, 318 40, 318 49, H02K 3700
Patent
active
054003032
ABSTRACT:
The driving device comprises two single-phase stepping motors (1, 2), each having a different preferential direction of rotation. The bidirectional drive is achieved by selectively feeding one or the other of the two motors.
REFERENCES:
patent: 4112671 (1978-09-01), Kato et al.
patent: 4563604 (1986-01-01), Xuan
Schwab Michel
Tu Mai X.
Detra SA
Roskoski Bernard
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