Method and apparatus for coordinated control of dot matrix print

Details Method and apparatus for coordinated control of dot matrix print Method and apparatus for coordinated control of dot matrix print

1982-07-16

1984-08-28

Sewell, Paul T.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

101 9305, 400121, 400322, B41J 312

Patent

active

044681402

ABSTRACT:
A dot matrix printer has a programmable interval counter which produces motion control pulses for stepping the stepper motor of a print head carriage and/or of a paper advance system. The same motion control pulse which is used to control the carriage step motor is also input to a microprocessor, in an open loop fashion, to request further print head data for driving the wire array(s) of the dot matrix print head. A programmed time delay may be introduced between the programmable interval counter and the carriage step motor to compensate for wire flight time of the print head wires in a manner which is substantially independent of carriage velocity. A variable delay may also be introduced between the programmable interval counter and the microprocessor to compensate for carriage motor shaft lag/lead. The number of print operations per control pulse and the number of control pulses per print operation may be independently controlled to increase the print density and quality by inserting programmable divider/counters between the programmable interval counter and the microprocessor and/or the carriage stepper motor.

REFERENCES:
patent: 3973662 (1976-08-01), Fulton
patent: 4116567 (1978-09-01), San Pietro
patent: 4210404 (1980-07-01), Hanger
patent: 4213714 (1980-07-01), Jones et al.
patent: 4278359 (1981-07-01), Weikel
patent: 4284362 (1981-08-01), Jackson et al.

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