Apparatus for supplying ink to an ink jet printer

Details Apparatus for supplying ink to an ink jet printer Apparatus for supplying ink to an ink jet printer

1993-01-28

1996-01-23

Wong, Peter S.

Incremental printing of symbolic information

Ink jet

Fluid or fluid source handling means

347 85, B41J 2175

Patent

active

054868556

ABSTRACT:
An ink cartridge for an ink jet printer that supplies ink at a negative pressure is disclosed. The cartridge includes a cartridge housing having an upper chamber and a lower chamber and a first wall therebetween. The upper chamber has an aperture exposed to atmosphere and it also contains a capillary foam having a specifiable capillarity for absorbing ink. The lower chamber is airlocked until the ink level in the upper chamber is sufficiently low to allow the passage of air through the pores. A printhead is disposed at a vertical height greater than a top level of the lower chamber. A supply line is provided which conveys ink by capillary action of the nozzles to the printhead. A second capillary foam has a specifiable capillarity greater than the capillarity of the first capillary foam. The second foam is in fluidic communication with the upper and lower chambers and with the supply line.

REFERENCES:
patent: 4714937 (1987-12-01), Kaplinsky
patent: 4771295 (1988-09-01), Baker et al.
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patent: 4794409 (1988-12-01), Cowger et al.
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patent: 4931811 (1990-06-01), Cowger et al.
patent: 5121132 (1992-06-01), Pan et al.
patent: 5182581 (1993-01-01), Kashimura et al.
patent: 5216450 (1993-06-01), Koitabashi et al.

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