Drive device for electric clock

Details Drive device for electric clock Drive device for electric clock

1976-04-06

1977-07-26

Schaefer, Robert K.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 46, G04B 1930

Patent

active

040374009

ABSTRACT:
A polarized drive rotor having opposite polarity poles is rotatably arranged in the magnetic field developed by a coreless field coil and a polarized auxiliary rotor also having opposite polarity poles is arranged and magnetically coupled to the drive rotor so as to displace, the drive rotor through a preselected angle with respect to the direction of the magnetic field developed by the coreless field coil. An output is taken out of either one of the polarized rotors to drive a gear train and accordingly drive a clock hand. Electric drive circuitry applies a forward electric current to the field coil to rotationally advance the rotors and after the rotors stop and when a preselected time has passed since the energization of the coil, the rotors are rotated again in the same direction by applying a reverse electric current to the coil. In this way the clock hand can be driven stepwise at intervals of preselected constant time.

REFERENCES:
patent: 3376442 (1968-04-01), David
patent: 3747320 (1973-07-01), Vuffray
patent: 3818690 (1974-06-01), Schwarzschild
patent: 3845334 (1974-10-01), Harada et al.
patent: 3937001 (1976-02-01), Berney
patent: 3972178 (1976-08-01), Beguin

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