Protection system for hammer drive circuits in impact printers

Details Protection system for hammer drive circuits in impact printers Protection system for hammer drive circuits in impact printers

1975-03-26

1976-12-21

Coven, Edward M.

Printing

Selective or progressive

Bed and platen machines

317 33SC, 235153AS, B41J 938

Patent

active

039981525

ABSTRACT:
An arrangement for protecting hammer drive solenoids in a printer against failure in associated SCR circuits by correlating the currents of SCR gate firing pulses with subsequent SCR conduction.

REFERENCES:
patent: 3140470 (1964-07-01), Deerfield
patent: 3539786 (1970-11-01), Raehpour
patent: 3602138 (1975-08-01), Barcomb
patent: 3699884 (1972-10-01), Marsh et al.
patent: 3796918 (1974-03-01), DeForest et al.
patent: 3813530 (1974-05-01), Chevalier et al.
patent: 3842317 (1974-10-01), Mattes et al.

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