Incremental printing of symbolic information – Ink jet – Fluid or fluid source handling means
Patent
1997-02-19
1999-10-19
Le, N.
Incremental printing of symbolic information
Ink jet
Fluid or fluid source handling means
347 92, B41J 2175
Patent
active
059697393
ABSTRACT:
An ink-jet pen is disclosed that has a body of resilient felted polyurethane foam mounted in an ink chamber for ink retention and backpressure. A rectangular ink pipe extends from a bottom wall of the ink chamber between the walls of the ink chamber. A wire mesh filter is mounted to the ink pipe. The ink pipe and mesh filter extend into compressive contact with the foam to locally increase the capillarity of the foam. Any air that comes out of solution collects as a bubble in the rectangular ink pipe. This bubble does not block ink flow to the printhead, however, because the corners of the rectangular ink pipe provide a fluid capillary path. The bubble tends to form in a spheroid shape and does not extend into the corners of the ink pipe. In addition, rectangular filters are used, which reduces waste and expense compared to circular filters.
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Altendorf John M.
Bostater Julie Jo
Boyd Melissa D.
Christensen Kenneth L.
Elliot Joseph R.
Davis H. Brian
Hewlett--Packard Company
Le N.
Nguyen Judy
Sullivan Kevin B.
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