Ink refill unit for maintaining negative pressure in negatively pressurized ink storage compartment
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United States of America Patent
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-
Nov 27, 2007
Grant Date -
Jul 21, 2005
app pub date -
Dec 20, 2004
filing date -
Jan 21, 2004
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A refill unit for refilling an ink storage compartment supplying a printhead assembly with an array of nozzles is provided. The refill unit has a body containing a quantity of ink, an ink outlet, and a repressurizing arrangement. During use, the ink storage compartment is maintained at a negative pressure to avoid inadvertent ink leakage from the nozzles. Accordingly, upon engagement of the refill unit with the ink storage compartment, the repressurizing arrangement causes part of the ink storage compartment to be inwardly depressed as the ink from the body is drawn into the ink storage compartment through the ink outlet by the negative pressure until pressure equalization. Further, upon subsequent disengagement of the refill unit from the ink storage compartment, the repressurizing arrangement releases the inwardly depressed part of the ink storage compartment to re-establish the negative pressure.
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