Print element drive control with constant current charge and dis

Details Print element drive control with constant current charge and dis Print element drive control with constant current charge and dis

1994-03-22

1995-05-09

Wiecking, David A.

Typewriting machines

Including type-set-assemblage mounted on carrier and...

Imprint by movement of record-medium against type-face

40012402, 361155, 361156, B41J 230

Patent

active

054134234

ABSTRACT:
A dot matrix printer having a print head having a plurality of print solenoids. The print head is carried on a print head carriage driven by a carriage drive arrangement. A print timing means supplies a sequence of print timing pulses as said print head traverses a print medium. A power supply supplies a print voltage to the print solenoids in the print head. A drive pulse circuit responds to each of said print timing pulses for producing a solenoid enable pulse of a duration which varies inversely with the magnitude of said print voltage. The drive pulse circuit utilizes a dual slope integration with a first period integrating a fixed voltage for a fixed time and a second period integrating the varying print voltage for a time which varies with the magnitude of the voltage and provides automatic adjustment of the total print timing signal.

REFERENCES:
patent: 3789272 (1974-01-01), Vollhardt
patent: 4318155 (1982-03-01), Thomas
patent: 4514737 (1985-04-01), Suzuki
patent: 4637742 (1987-01-01), Sakai
patent: 4683817 (1987-08-01), Del Signore
patent: 4735517 (1988-04-01), Knox
patent: 5032031 (1991-07-01), Gruner

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