Ink level detection in a pressure regulated pen

Details Ink level detection in a pressure regulated pen Ink level detection in a pressure regulated pen

1994-10-31

1996-12-10

Fuller, Benjamin R.

Incremental printing of symbolic information

Ink jet

Controller

347 86, B41J 2195, B41J 2175

Patent

active

055835457

ABSTRACT:
The present invention relates to Ink Level Detection in a Pressure Regulated Pen. A liquid level detector for a liquid containment device, such as an ink-jet pen, provides a signal indicative of a lowering level of liquid in the containment device. In exemplary embodiments, a refillable or replaceable ink reservoir supplies ink to the printhead of the pen under pressure. Electrical or electromagnetic devices are used individually or in combination with a pressure regulator apparatus to sense a back pressure in the containment device after the reservoir has gone dry to trigger a signal indicating a low or out-of-ink condition.

REFERENCES:
patent: 4804944 (1989-02-01), Golladay et al.
patent: 4940997 (1990-07-01), Hamlin et al.
patent: 5079570 (1992-01-01), Mohr et al.
patent: 5315317 (1994-03-01), Terasawa et al.

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