Inkjet printer, ink pump mechanism and actuator

Incremental printing of symbolic information – Ink jet – Fluid or fluid source handling means

Reexamination Certificate

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Reexamination Certificate

active

07033007

ABSTRACT:
An inkjet printer, utilising at least one ink reservoir having a pump chamber, includes an ink pumping mechanism for pressurising the chamber, the pumping mechanism including an actuator that is biased to pressurise the chamber and that is acted on by a cam to release the pressure. The actuator can include an opening through which the camshaft extends, and the cam can be accommodated within the opening and can engage a cam follower formed on an inner wall of the opening. The bias may be a compression spring mounted in a drop-in manner within a guide element for the actuator. The cam and spring can act directly on the actuator, and a single actuator element can pressurise the chamber, act as a cam follower and include an out-of-ink trigger thereon.

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patent: 5856839 (1999-01-01), Aukstikalnis et al.
patent: 6109740 (2000-08-01), Namekawa et al.
patent: 6550899 (2003-04-01), Cowger et al.

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