Clearing ink jet nozzles during printing

Facsimile and static presentation processing – Static presentation processing – Dot matrix array

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358 14, 358 19, 347 15, 347 24, 347 35, 347 43, B41B 1500, B41J 1500, B41J 2205, B41J 2165

Patent

active

061668281

ABSTRACT:
In an ink jet printer having plural ink ejection nozzles on a print head, additional firings are added for each print element so as to ensure that the ink jet nozzles remain unclogged during printing. The extra firings are effected directly onto the recording medium in a controlled way so as to ensure that printout quality is not adversely affected. Particularly, extra firings of lighter-colored inks are effected over regions of darker colored ink, and any color shift caused thereby is compensated by changing printout data in the surrounding region.

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patent: 5806997 (1998-09-01), Kawanabe

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