Driving force control system for impact printer

Details Driving force control system for impact printer Driving force control system for impact printer

1980-11-06

1982-06-08

Sewell, Paul T.

Printing

Selective or progressive

Bed and platen machines

101 9303, 400166, 400167, B41J 784, B41J 792, B41J 938, B41J 942

Patent

active

043333982

ABSTRACT:
In a drive circuit for an electromagnetic printing element of a matrix impact printer, a drive pulse drives the printing element from the backstop toward a record medium to print indicia, and a damping pulse, applied to the printing element after its return to the backstop, urges it toward the backstop to limit rebound therefrom. Logical control circuitry is responsive to overlap of a drive pulse with a preceding damping pulse for terminating the damping pulse and for decreasing the width of the drive pulse in proportion to the amount of overlap. Blanking means are provided to prevent application of a damping pulse to the printing element until after the completion of a preceding drive pulse and after impact of the printing element with the record medium and with the backstop.

REFERENCES:
patent: 3678847 (1970-06-01), Pear et al.
patent: 4162131 (1979-07-01), Carson et al.
patent: 4192230 (1980-03-01), Blom et al.
patent: 4291992 (1981-09-01), Barr et al.

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