Electronic watch

Details Electronic watch Electronic watch

1978-06-27

1981-06-16

Weldon, Ulysses

Horology: time measuring systems or devices

Regulating means

For setting

368228, 368187, 368 76, G04B 1712

Patent

active

042741505

ABSTRACT:
An electronic timepiece having a stepping motor and a drive circuit responsive to a control signal for applying electrical drive pulses having polarities determined by the control signal for rotating the rotor of the stepping motor. The control circuit normally operates in a mode for applying a control signal to the drive circuit effective to control the drive circuit to apply alternate polarity electrical drive pulses to rotate the stepping motor rotor in a normal direction. Resetting circuitry is operable for correcting the time kept by the timepiece. A detecting circuit detects whether the stepping motor rotor is in a position to be rotated by a forthcoming drive pulse after resetting. If the stepping motor rotor is not in a position for rotation a detection circuit signal is applied to the control circuit so that the control signal controls the drive circuit to apply an electrical pulse effective to rotate the stepping motor rotor after resetting. Consequently, after resetting the immediately forthcoming drive pulse will have a polarity effective to rotate the stepping motor rotor and no time will be lost.

REFERENCES:
patent: 3948036 (1976-04-01), Morokawa
patent: 3967442 (1976-07-01), Berney
patent: 4022013 (1977-05-01), Kamijo
patent: 4050234 (1977-09-01), Toshio
patent: 4051666 (1977-10-01), Yoshino et al.

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