Drive device for stepper motor and indicating apparatus...

Electricity: motive power systems – Positional servo systems – With particular motor control system responsive to the...

Reexamination Certificate

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Details

C318S587000, C318S696000

Reexamination Certificate

active

07129670

ABSTRACT:
A drive device includes stepper motors, each having an excitation coil and a rotor rotating based on variation in the excitation state of the excitation coil; driven members, each moving in accordance with the rotation of the rotor of the corresponding stepper motor; stoppers, each stopping the driven member mechanically at a zero position; and a controller, controlling the respective stepper motors so as to selectively performs either a normal operation in which the stepper motor is driven so as to rotate, or a zero-position detection operation in which the stepper motor is driven so that the driven member is moved to the stopper. The controller starts to perform the zero-position detection operation simultaneously in all of the stepper motors and changes the stepper motor which has terminated the zero-position detection operation to the normal operation without waiting for the termination of the zero-position detection operation in other stepper motors.

REFERENCES:
patent: 5723964 (1998-03-01), Nakaba
patent: 5900711 (1999-05-01), Senoo
patent: 6798164 (2004-09-01), Umehara et al.
patent: 6838982 (2005-01-01), Kondo et al.
patent: 6853162 (2005-02-01), Betts et al.
patent: 6956351 (2005-10-01), Yamada
patent: 2003/0214391 (2003-11-01), Kondo et al.
patent: 2004/0108829 (2004-06-01), Betts et al.
patent: 2005/0024008 (2005-02-01), Yamada
patent: 2005/0083008 (2005-04-01), Oishi
patent: 2005/0116678 (2005-06-01), Yamada
patent: 2001-327193 (2001-01-01), None

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