On-page inkjet printhead spitting system

Details On-page inkjet printhead spitting system On-page inkjet printhead spitting system

1994-09-30

1997-08-19

Barlow, Jr., John E.

Incremental printing of symbolic information

Ink jet

Ejector mechanism

347 24, B41J 2165

Patent

active

056593422

ABSTRACT:
An on-page inkjet printhead spitting system purges the printhead nozzles across the printed page, and occasionally in the conventional service station spittoon. In addition to the image-forming droplets, extra purging droplets are fired to maintain pen health. To determine when to purge each nozzle, the number of times each nozzle is fired to print the image is counted or estimated, or printhead characteristics are monitored. The purging dots may be located on the page, in the spittoon, or both. On the page, the purging dots may be hidden from view, in the image background or over the image dots, or hidden in plain sight adjacent image dots, in speed bars, in a watermark type design, or in a repeating pattern. Use of this on-page spitting system conserves ink and improves throughput of the printing mechanism, without requiring any sacrifice in the print quality appearance to the naked eye.

REFERENCES:
patent: 4791435 (1988-12-01), Smith et al.
patent: 5177505 (1993-01-01), Sugiura et al.
patent: 5369428 (1994-11-01), Maze et al.

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