Dynamic control of nonlinear ink properties for drop-on-demand i

Recorders – Markers and/or driving means therefor – With ink supply to marker

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G01D 1516

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044929684

ABSTRACT:
A drop-on-demand ink jet printing apparatus comprising a print head having an electromechanical transducer mounted in mechanical communication with the fluid in a fluid chamber within the print head. The transducer is selectively energized with a drop ejecting signal so that one drop of ink is ejected for each drop ejecting signal. In addition the transducer is energized with a series of low amplitude excitation signals which serve to maintain substantially constant dynamic ink characteristics so that quality printing is produced especially during start-up of the apparatus. The excitation pulses can be asynchronous with respect to the drop ejecting signals or synchronous but delayed with respect to the drop ejecting signals. Isolation means are provided to prevent concurrent excitation of the transducer with both a drop ejecting signal and an excitation signal.

REFERENCES:
patent: 3893131 (1975-07-01), Perel
patent: 4216483 (1980-08-01), Kyser
patent: 4266232 (1981-05-01), Juliana
patent: 4300144 (1981-11-01), Isayama
patent: 4393388 (1983-07-01), Matsuda
patent: 4409596 (1983-10-01), Ishii

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