Method for dot matrix printing at selected uniform dot column sp

Details Method for dot matrix printing at selected uniform dot column sp Method for dot matrix printing at selected uniform dot column sp

1983-03-04

1983-12-20

Sewell, Paul T.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

400303, B41J 312

Patent

active

044214316

ABSTRACT:
For use with a matrix printer, a method for printing dot columns at uniform spacing regardless of irregular print carrier motion, the column spacing selected, and the use of a low resolution pulse source. The pulse source generates control pulses at intervals representing carrier movement through a given distance greater than any selected dot column spacing. As disclosed the method calculates the distances from a control pulse to the possible printing positions between two control pulses, according to the column spacing selected, and the known distance between pulses. Also, the time between control pulses is measured and used with the known distance between pulses to calculate the carrier velocity. From the carrier velocity and the distance from a control pulse to printing positions between control pulses, the times of energization of the print wires to effect printing at the uniformly spaced printing positions are calculated.
When carrier motion is irregular as when starting up, the rate of change of velocity is employed to develop and apply a correction factor to influence and vary the times of energization of the print wires to achieve uniform dot column spacing.

REFERENCES:
patent: 4116567 (1978-09-01), San Pietro
patent: 4119383 (1978-10-01), Watanabe et al.

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