Ink pressure regulator with improved liquid retention in...

Incremental printing of symbolic information – Ink jet – Controller

Reexamination Certificate

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C347S086000

Reexamination Certificate

active

07841684

ABSTRACT:
There is provided an ink pressure regulator for regulating a hydrostatic pressure of ink supplied to an inkjet printhead. The regulator comprises: an ink chamber having an ink outlet for fluid communication with the printhead via an ink line; an air inlet; a regulator channel having a first end communicating with the air inlet and a second end communicating with a headspace of the chamber, the second end defining a bubble outlet; and a wetting system for maintaining at least some liquid in the regulator channel, thereby ensuring that air entering the headspace first passes through the liquid. The wetting system comprises a first wetting chamber connected to the first end, a second wetting chamber connected to the second end, and a liquid-retaining structure positioned in the second wetting chamber. The regulator channel, the first wetting chamber, the second wetting chamber and the liquid-retaining structure are all in fluid communication with each other. The regulator channel is dimensioned to control a Laplace pressure of air bubbles drawn from the bubble outlet as result of supplying ink to the printhead, thereby regulating a hydrostatic pressure of the ink.

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patent: 5526030 (1996-06-01), Baldwin et al.
patent: 5760806 (1998-06-01), Oda et al.
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patent: 6726315 (2004-04-01), Koizumi et al.
patent: 6783219 (2004-08-01), Lui et al.
patent: 2007/0097187 (2007-05-01), Lewey et al.

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