Method and apparatus for energizing a printhead

Details Method and apparatus for energizing a printhead Method and apparatus for energizing a printhead

1987-04-13

1989-07-18

Sewell, Paul T.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

101 9303, 361152, 4001573, 400166, B41J 938, B41J 312

Patent

active

048489433

ABSTRACT:
A method and apparatus for energizing a printhead by maintaining substantially constant peak current in the actuator means of the printhead regardless of the duty cycle of the actuator means. The method and apparatus establishes a minimum time period for energizing the actuator means and a supplemental time period for energizing the actuator means in response to the determined duty cycle. The actuator means are then energized for an extended time period in dependence upon the minimum time period and the established supplemental time period to thereby maintain substantially constant peak current in the actuator means regardless of the duty cycle thereof.

REFERENCES:
patent: 4230411 (1980-10-01), Grottrup
patent: 4350449 (1982-09-01), Countryman
patent: 4389935 (1983-06-01), Arai
patent: 4464669 (1984-08-01), Sekiya
patent: 4503480 (1985-03-01), Pickard
patent: 4566813 (1986-01-01), Kobayashi
patent: 4567488 (1986-01-01), Moriguchi
patent: 4663734 (1987-05-01), Beary
patent: 4664542 (1987-05-01), Tsugita
patent: 4674897 (1987-06-01), West

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