Alignment system for multiple color pen cartridges

Details Alignment system for multiple color pen cartridges Alignment system for multiple color pen cartridges

1993-10-04

1994-09-27

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2502221, 349 7, G01D 1800, G01V 904

Patent

active

053509293

ABSTRACT:
A multiple printhead cartridge color thermal ink jet printer having apparatus for measuring the offsets between the multiple printhead cartridges each of which includes a nozzle array of one or more columns of nozzles, each column being parallel to the media axis of the printer. The cartridges are individually operated, stationarily and while scanning, to fire drops at an aperture plate interposed between an optical drop detector and the nozzle arrays of the printhead cartridges. The detection of drops passing through the aperture plate and the non-detection of drops blocked by the aperture plate provide information which is utilized in conjunction with the nature of the operation of the cartridges that produced the detected drops to determine the positions of the nozzle arrays of the cartridges relative to each other. The optical drop detector includes optical light benders that advantageously positions the optical detection zones of the optical detector closer to the aperture plate, which allows higher drop fire rates to be utilized for offset determination.

REFERENCES:
patent: 4493993 (1985-01-01), Kanamuller et al.
patent: 4922268 (1990-05-01), Osborne
patent: 4922270 (1990-05-01), Cobbs et al.
patent: 4963882 (1990-10-01), Hickman
patent: 4965593 (1990-10-01), Hickman
patent: 5036340 (1991-07-01), Osborne
patent: 5255009 (1991-10-01), Bauer
patent: 5276467 (1994-01-01), Meyer et al.

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