Horology: time measuring systems or devices – Chronological – With mechanical or electromechanical driven display
Patent
1978-04-20
1981-06-09
Miska, Vit W.
Horology: time measuring systems or devices
Chronological
With mechanical or electromechanical driven display
368 85, 368217, G04B 1904, G04C 1900
Patent
active
042728371
ABSTRACT:
An electronic timepiece including a dividing circuit for developing different output pulse signals having different respective pulse repetition rates, a stepping motor and a drive circuit responsive to control signals for driving the stepping motor at a normal rate and for applying a correction pulse to the stepping motor according to the control signals. A pulse combining circuit combines the different output pulse signals from the dividing circuit for generating control signals and for applying the control signals to the drive circuit. The pulse combining circuit normally generates a control signal effective to drive the stepping motor at a normal rate, and the pulse combining circuit is responsive to a correction signal to control the drive circuit to apply a corrective pulse to the stepping motor. A detection circuit detects rotation and non-rotation of the stepping motor rotor and generates a detection voltage signal indicative of the state of rotation of the rotor. A voltage comparing circuit compares the detection voltage signal with a standard voltage value and applies a correction signal to the pulse combining circuit when non-rotation of the stepping rotor is detected after a drive pulse is applied to the stepping motor.
REFERENCES:
patent: 4032827 (1977-06-01), Dobratz
patent: 4114364 (1978-09-01), Takahishi
patent: 4129981 (1978-12-01), Nomoru et al.
Asano Kazuhiro
Mandai Masaaki
Satoh Katsuhiko
Shida Masaharu
Torisawa Akira
Adams Bruce L.
Burns Robert E.
Kabushiki Kaisha Daini Seikosha
Lobato Emmanuel J.
Miska Vit W.
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