Ink-jet printer having an ink jet print head end of life detecti

Details Ink-jet printer having an ink jet print head end of life detecti Ink-jet printer having an ink jet print head end of life detecti

1992-04-01

1993-10-19

Grimley, A. T.

Recorders

Markers and/or driving means therefor

With ink supply to marker

73304R, 324522, 324523, 324548, 400126, G01D 1516

Patent

active

052550214

ABSTRACT:
In an ink-jet printer of the type wherein a current is passed through a conductive ink contained between a pair of electrodes to cause the ink to become vaporized and cause trapped gasses or bubbles to expand suddenly, exerting a sufficient pressure upon the ink to force droplets of ink from a nozzle, a current value flowing between the electrodes is detected to determine the amount of wear of the electrodes, and when the detected current value is lower than a predetermined value, an alarm indicative of the replacement of the currently used ink-jet head is given and, at the same time, ejection of the ink from the nozzle is stopped. Thus, printing operation is always achieved with stable ejection of ink, guaranteeing high printing qualities.

REFERENCES:
patent: 3179042 (1965-04-01), Naiman
patent: 4183029 (1980-01-01), Isayama et al.
patent: 4853718 (1989-08-01), El Hatem et al.
patent: 4996487 (1991-02-01), McSparran et al.

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