Device for controlling movement of a rotating element

Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Plural – diverse motor controls for different motors

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318 53, 318 67, 318 37, 318 41, H02P 768

Patent

active

048292176

ABSTRACT:
A safety device for use in a recording apparatus controls the on/off operation and prevents the malfunction of motors for driving a gear flange to rotate a light sensitive drum and for driving an actuating gear and other driving members in accordance with a signal indicative of the reference rotational frequency received from an oscillator and a signal indicative of the rotational frequency of each motor. A motor control circuit is used including motor drivers for controlling the operation of said motors and a fault detection circuit for detecting the malfunction of said motors by comparing an adder output indicative of said motors' rotational frequencies with threshold values in a comparator, thereby ascertaining the long-term use of the light sensitive drum.

REFERENCES:
patent: 2418134 (1947-04-01), Mitchell
patent: 3497778 (1970-02-01), Gerber
patent: 3832616 (1974-08-01), Vinner
patent: 4169681 (1979-10-01), Kato
patent: 4186619 (1980-02-01), Nissen et al.
patent: 4425036 (1984-01-01), Kameyama et al.
patent: 4426149 (1984-01-01), Kuemmel et al.

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