Ink jet printing apparatus and preliminary ejecting method

Details Ink jet printing apparatus and preliminary ejecting method Ink jet printing apparatus and preliminary ejecting method

2006-01-03

2008-08-19

Nguyen, Lam S (Department: 2853)

Incremental printing of symbolic information

Ink jet

Ejector mechanism

C347S036000, C347S023000

Reexamination Certificate

active

07413282

ABSTRACT:
In both a full-line and a serial printer, the amount of ink passing through nozzles of print heads is sometimes decreased below a normal value before and during actual printing. In the printer of the present invention, a preliminary ejecting operation is performed taking the opportunity in which the amount of ink passing through nozzles is decreased below a normal value. Then, the amount of ink passing through nozzles recovers to the normal value in ink ejection after the preliminary ejecting operation. Since only a small amount of ink is ejected through the nozzles during the preliminary ejection operation, dots formed on a print sheet are not noticeable. Further, it is unnecessary to move the print heads to a home position where an ejection recovering process is executed to remove ink having an increased viscosity.

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Michael C. Ferringer et al., “Color Maintenance Spitting Algorithm For Ink Jet Printers,” Xerox Disclosure Jounal, vol. 23, No. 3, May/Jun. 1998, p. 131.

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