Serial printer capable of promptly detecting abnormality in head

Details Serial printer capable of promptly detecting abnormality in head Serial printer capable of promptly detecting abnormality in head

1993-06-10

1994-11-29

Burr, Edgar S.

Typewriting machines

Control of print position along print-line by signal...

400320, 400705, 4007051, B41J 2942

Patent

active

053684028

ABSTRACT:
A movement distance monitoring pulse counter counts drive pulses being applied to a carriage-moving pulse motor, and produces a count value M. An optical sensor attached to a head carriage detects slits of a slit encoder passed by the head carriage. A slit counter counts output pulses of the optical sensor, and produces a reset signal every time the count reaches a preset number of output pulses corresponding to a monitoring carriage movement distance. The count value M is reset in response to the reset signal. When the count value M exceeds a preset number of drive pulses corresponding to the monitoring carriage movement distance, an abnormality detection signal is produced.

REFERENCES:
patent: 4305674 (1981-12-01), Velazquez
patent: 4338035 (1982-07-01), Kondo et al.
patent: 4652159 (1987-03-01), Nagai
patent: 4789874 (1988-12-01), Majette et al.
patent: 4802777 (1989-02-01), Yamada
patent: 4838717 (1989-06-01), Ogura
patent: 5087134 (1992-02-01), Tanuma et al.

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