Dot matrix print head drive method

Details Dot matrix print head drive method Dot matrix print head drive method

1989-12-19

1991-08-13

Wiecking, David A.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

4001573, 400175, B41J 230

Patent

active

050392379

ABSTRACT:
In a dot matrix print head drive method for controlling head drive signals for driving dot pins in accordance with print pattern signals, a correction factor is set specifically to each dot pin; and the length of time for which the print pattern signals are to remain in effects is varied according to the correction factor, to correct the drive time for each dot pin.

REFERENCES:
patent: 4162131 (1979-07-01), Carson, Jr. et al.
patent: 4189246 (1980-02-01), Kane
patent: 4281938 (1981-08-01), Phillips
patent: 4597328 (1986-07-01), Carrington et al.
patent: 4741634 (1988-05-01), Nozaki et al.
patent: 4741636 (1988-05-01), Tokahashi et al.
patent: 4764039 (1988-08-01), Bublitz
patent: 4778291 (1988-10-01), Mitsuhashi
Research Disclosure, "Printhead Test Fixture", Anonymous, Jun. 1987, No. 278, 400/704.
IBM Technical Disclosure Bulletin, "Acoustical Diagnostic Analysis of Individual Print Wire Actuator", Anon., vol. 30, No. 5, Oct. 1987, pp. 342; 400/704.

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