Thermal ink jet pen having a feedtube with improved sizing and o

Details Thermal ink jet pen having a feedtube with improved sizing and o Thermal ink jet pen having a feedtube with improved sizing and o

1989-01-31

1990-06-05

Hartary, Joseph W.

Recorders

Markers and/or driving means therefor

With ink supply to marker

B41J 219

Patent

active

049318110

ABSTRACT:
An ink jet pen having a main ink reservoir therein connected to a thin film printhead by way of a large diameter standpipe, wherein the diameter of an air accumulating section of the standpipe is sufficiently large to enable ink to pass through the standpipe despite the presence of air in the air accumulating section when the printhead is in operation. The large diameter air bubbles which form in the air accumulating section are easily deformed by suction force from the printhead and thus allow ink to pass through the standpipe between the air bubbles and the walls of the standpipe. This action enables the ink jet pen to operated continuously without undue suction on the standpipe which leads to depriming.

REFERENCES:
patent: 4126868 (1978-11-01), Kirner
patent: 4368478 (1983-01-01), Koto
patent: 4630758 (1986-12-01), Mutoh
patent: 4771295 (1988-09-01), Baker
patent: 4794409 (1988-12-01), Cowger

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