Inter pen offset determination and compensation in multi-pen the

Details Inter pen offset determination and compensation in multi-pen the Inter pen offset determination and compensation in multi-pen the

1989-01-31

1990-05-01

Hartary, Joseph W.

Recorders

Markers and/or driving means therefor

With ink supply to marker

346 81, 2502221, G01D 1800, B41J 304

Patent

active

049222708

ABSTRACT:
Apparatus for determining inter-pen offsets in a multiple pen ink jet printer including a drop detector for measuring flight time of ink drops, an aperture plate disposed in the print media plane, and a carriage position sensor for determining carriage position when ink drop flight time exceeds a predetermined value, which indicates that an ink jet is at the edge of the aperture plate. The sensed carriage positions for the respective pens provides information indicative of inter-pen offset in the scan axis direction. In a further embodiment of the invention, the aperture plate can have a stair-shaped boundary to facilitate the calibration of a plurality of nozzles in one scan. For determination of inter-pen offset in the media scan direction, the aperture includes a comb-like boundary that is utilized to produce the detect
o detect pattern for a nozzle array in each of the pens, whereby the pattern for each of the pens provides information indicative of the offset between pens.

REFERENCES:
patent: 4323905 (1982-04-01), Reitberger
patent: 4509057 (1985-04-01), Sohl
patent: 4590482 (1986-05-01), Hay
patent: 4675696 (1987-06-01), Suzuki
patent: 4709244 (1987-11-01), Piatt

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