Circuitry for correcting dot placement for oscillating carriage

Details Circuitry for correcting dot placement for oscillating carriage Circuitry for correcting dot placement for oscillating carriage

1982-11-22

1985-06-18

Goldberg, E. A.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

346 75, 346140R, G01D 1516, G01D 1518

Patent

active

045243646

ABSTRACT:
A circuit for use in an ink jet printer in which the carriage motion either approximates a sinusoidal vibratory pattern, or which has any variable velocity pattern that reliably repeats from cycle to cycle. It is further assumed that the printer will print in both directions of the carriage, and that the flight time of the ink drop from jet to paper is constant. A counter starts at a value corresponding to the flight time of the ink drop, and then measures the time of the carriage over a predetermined distance. The difference is the required delay. A second delay counter uses this value to produce a time delay prior to ejecting the ink drop. Since, in an actual ink jet printer, several drops will be in transit at the same time, the circuit is provided with a plurality of phases or channels which operate concurrently.

REFERENCES:
patent: 4345263 (1982-08-01), Tazaki et al.
patent: 4386358 (1983-05-01), Fischbeck

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