Ink jet printing apparatus and preliminary ink ejection method

Details Ink jet printing apparatus and preliminary ink ejection method Ink jet printing apparatus and preliminary ink ejection method

2006-01-10

2006-01-10

Meier, Stephen (Department: 2853)

Incremental printing of symbolic information

Ink jet

Controller

C347S030000, C347S012000

Reexamination Certificate

active

06984009

ABSTRACT:
In a print head having arrays of large nozzles and small nozzles with different ink ejection volumes that are connected to a common ink chamber, the preliminary ejection operation is performed 29,000 times first on only the large nozzles at an ejection frequency of 10 kHz to discharge viscous or mixed color ink from ink chambers. After the preliminary ejection operation of the large nozzles is finished, only the small nozzles are made to perform the preliminary ejection operation 2,000 times at an ejection frequency of 10 kHz. Reducing the number of preliminary ejections from the small nozzles in this manner can minimize the generation of stray mist. Further, by performing the preliminary ejection operation on the large nozzles first, it is possible to discharge enough viscous ink from the ink chamber.

REFERENCES:
patent: 5412410 (1995-05-01), Rezanka
patent: 6079809 (2000-06-01), Yaegashi et al.
patent: 2001/0005210 (2001-06-01), Suzuki
U.S. Appl. No. 10/636,687 (Iwasaki et al.), filed Aug. 8, 2003.
U.S. Appl. No. 10/647,272 (Satoshi et al.), filed Aug. 26, 2003.
U.S. Appl. No. 10/649,640 (Nakagawa et al.), filed Aug. 28, 2003 .

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