Ink jet print head

Details Ink jet print head Ink jet print head

1986-10-23

1987-09-22

Hartary, Joseph W.

Recorders

Markers and/or driving means therefor

With ink supply to marker

G01D 1518

Patent

active

046958525

ABSTRACT:
A print element is actuated by a piezoelectric transducer controlled by a circuit which is capable of emitting a pulse in such a way that the reflection waves arising from expulsion pressure in the conduit for the ink are cancelled. The transducer is also connected to a circuit for detecting the pressure of the ink during the printing operation. A circuit for detecting the malfunctioning is capable of storing and signalling both the presence of bubbles in the conduit and the conduit empty condition. For bubbles, a flip-flop in the malfunction detecting circuit stores a signal indicating the presence of reflection phenomena when control circuit is operated for cancellation of the reflection waves. For the conduit empty condition it stores a signal indicative of the absence of reflection phenomena when the control circuit is operated in such a way that cancellation of the reflection waves does not occur.

REFERENCES:
patent: 4323908 (1982-04-01), Lee
patent: 4466005 (1984-08-01), Yoshimura
patent: 4518974 (1985-05-01), Isayama

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