Adjustable pen-to-paper spacing in printers using black and colo

Details Adjustable pen-to-paper spacing in printers using black and colo Adjustable pen-to-paper spacing in printers using black and colo

1993-10-29

1996-04-23

Fuller, Benjamin R.

Incremental printing of symbolic information

Ink jet

Controller

347 43, B41J 25308, B41J 221

Patent

active

055108156

ABSTRACT:
In order to optimize print quality, it is desirable to minimize the distance between a inkjet printhead and the media that is being printed on. This reduces print quality degradation by stray drops of ink with different trajectories than the main drop and errors in the nominal trajectory of the main drop. Color inkjet printers commonly employ a plurality of print cartridges, usually either two or four, mounted in the printer carriage to produce a full spectrum of colors. In a multiple printhead printer, it is advantageous if the black print cartridge is closer to the print media when printing text than is the color cartridge when printing color graphics. The apparatus and method of this disclosure enables the black printhead in an inkjet printer with both black and color cartridges to be as close to the media as possible so that black text print quality will be optimized while also allowing the printing of color graphics. Since black text print quality is more sensitive to printhead-to-media distance than is color graphics quality, the overall print quality of both black text and color graphics is optimized.

REFERENCES:
patent: 4675696 (1987-06-01), Suzuki
patent: 4774529 (1988-09-01), Paranjpe et al.

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