Incremental printing of symbolic information – Ink jet – Ejector mechanism
Reexamination Certificate
2011-01-04
2011-01-04
Huffman, Julian D (Department: 2853)
Incremental printing of symbolic information
Ink jet
Ejector mechanism
Reexamination Certificate
active
07862145
ABSTRACT:
An object of this invention is to properly prevent clogging of each nozzle in order to stably discharge ink without increasing a circuit scale even when the number of nozzles increases. For this purpose, the number of ink discharges from each printing element is stored in a memory. The number of ink discharges from each printing element that is measured from input printing data is subtracted from that stored in the memory, and the subtraction result is rewritten into the memory. The subtraction result is checked in a predetermined period, and if the number of ink discharges from each printing element is equal to or larger than a predetermined count, preliminary discharge to be performed periodically is suppressed.
REFERENCES:
patent: 2004/0207683 (2004-10-01), Sonobe
patent: 2006/0061617 (2006-03-01), Udagawa
patent: 2004-50518 (2004-02-01), None
patent: 2004-58528 (2004-02-01), None
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Huffman Julian D
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