Hewlett-packard Company

Swee Guan Chee

Jiansan Sun

Wan Sin Ng

Sieo Peng Clara Chua

Kay Khoon Khoo

An ink-firing element is provided. The ink-firing element has a resistor for generating ink droplets, a substrate atop which the resistor rests and a barrier layer atop the substrate. The barrier layer in a closed-loop design and at least partially defines an ink-firing chamber, which surrounds the resistor and temporarily contains ink. The ink-firing element also includes an orifice plate supported by the barrier layer for providing an orifice through which the ink droplets are ejected onto a medium and a trench in the substrate for replenishment of ink. The trench terminates at an outlet in the ink-firing chamber and is in fluid communication with an ink refill channel, which supplies ink from a reservoir to the ink-firing element.

Ink delivery system for an inkjet printhead

A wiper that does not scratch exit regions of nozzles during wiping process is disclosed. The wiper has a non-recessed wiping region and a recessed wiping region at one end. The recessed wiping region is positioned approximately opposite to columns of nozzles of a printhead during wiping, such that the wiper does not directly contacts the nozzles. The non-recessed regions, however, presses against the printhead to exert desired forces for wiping and maintains a gap between the printhead and the recessed wiping region.

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Swee Guan Chee