Air purging of a pressure regulated free-ink ink-jet pen

Details Air purging of a pressure regulated free-ink ink-jet pen Air purging of a pressure regulated free-ink ink-jet pen

1996-04-12

1998-09-22

Hartary, Joseph W.

Incremental printing of symbolic information

Ink jet

Fluid or fluid source handling means

347 85, B41J 219, B41J 2175

Patent

active

058121684

ABSTRACT:
The present invention relates to free-ink type ink-jet pens and, more particularly, to a method and apparatus for purging air from an on-axis ink accumulator. A biased regulator mechanism is provided within the pen to allow ink from a pressurized ink reservoir to be fed to the pen while maintaining a predetermined set point back-pressure at the printhead as needed for appropriate pen operation. A mechanism in communication with the ambient atmosphere is used in conjunction with a substantially constant force biasing mechanism to maintain the balance between the countervailing forces. Back-pressure is maintained substantially constant regardless of the ink flow rate from the ink reservoir into the accumulator. By application of a positive pressure to the ambient atmosphere mechanism, the biased regulator mechanism is forced open and any gas bubbles trapped within the accumulator is forced out through the reservoir ink feed.

REFERENCES:
patent: 4509062 (1985-04-01), Low et al.
patent: 4677447 (1987-06-01), Nielsen
patent: 4940997 (1990-07-01), Hamlin et al.
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patent: 5079570 (1992-01-01), Hohr et al.
patent: 5325119 (1994-06-01), Fong
patent: 5457485 (1995-10-01), Moriyama et al.
patent: 5500657 (1996-03-01), Yauchi et al.
patent: 5650811 (1997-07-01), Seccombe et al.

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