Print head apparatus with malfunction detector

Details Print head apparatus with malfunction detector Print head apparatus with malfunction detector

2007-07-31

2007-07-31

Pham, Hai (Department: 2853)

Incremental printing of symbolic information

Ink jet

Controller

C347S009000, C347S014000

Reexamination Certificate

active

09416618

ABSTRACT:
A print head and method that are capable of detecting a plurality of performance conditions such as a dry-fire, no-fire or clogged-nozzle condition. Pressure wave sensors within a print head are disclosed that are capable of detecting pressure waves generated by the firing of an ink expulsion mechanism. The characteristics of the pressure wave generated by the firing event (e.g., magnitude and timing) are indicative of the operating condition within the head. Multiple sensor types are disclosed.

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