Method and apparatus for driving an ink jet printer head

Details Method and apparatus for driving an ink jet printer head Method and apparatus for driving an ink jet printer head

1981-08-11

1983-10-11

Hartary, Joseph W.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

346140R, G01D 1518

Patent

active

044095961

ABSTRACT:
Conditions in the ink supply, nozzle and passages of an ink jet printer head are maintained in a state of dynamic equilibrium by application of a continuous flow of intermediate pulses to the piezoelectric transducer in the ejection system. The intermediate pulses are combined with selectively applied ejection pulses. Only the occurrence of an ejection pulse causes a droplet to be propelled from the printer head nozzle to the recording media. The intermediate pulses differ from the ejection pulses in amplitude, period or rate of change of the signal and transducer deflection produced, and occur at a frequency which prevents a return of static pressure equilibrium in the ink system between pulses. Gradation in printing can be produced from variation in time between intermediate and ejection pulses.

REFERENCES:
patent: 4068144 (1978-01-01), Toye
patent: 4104646 (1978-08-01), Fischbeck
patent: 4112433 (1978-09-01), Vernon
patent: 4266232 (1981-05-01), Juliana
patent: 4291316 (1981-09-01), Kakeno

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