Print head drive system with trouble detector

Details Print head drive system with trouble detector Print head drive system with trouble detector

1986-08-06

1988-09-20

Wiecking, David

Typewriting machines

Safety switch or condition-responsive-cutoff switch for...

400120, 400121, 400 74, B41J 2938

Patent

active

047721405

ABSTRACT:
A print head drive system of the type wherein there is provided a one-shot generating circuit for generating one-shot pulses in response to an instruction given from a processor and the energization of a head is effected in response to the one-shot pulse supplied from the one-shot generating circuit, characterized in that there is included a mechanical trouble detector for detecting occurrence of trouble, the pulse duration of one-shot pulse generated in the one-shot generating circuit is made shorter than the time interval during which the energization of the head is effected in the normal operating time, and the processor issues during the normal operating time the instruction plural times to the one-shot generating circuit, whereby when abnormal operation is detected by the mechanical trouble detector, generation of one-shot pulse is inhibited, so that the time interval of energization of the head is shortened.

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