Arrangement for monitoring functioning of an ink print head

Details Arrangement for monitoring functioning of an ink print head Arrangement for monitoring functioning of an ink print head

1996-09-26

1998-06-23

Burr, Edgar S.

Incremental printing of symbolic information

Ink jet

Controller

347 14, B41J 2938

Patent

active

057710511

ABSTRACT:
An arrangement for monitoring the functioning of an ink print head, an enhancement of the functional dependability by enhancing the monitoring precision given reduced outlay is obtained with a constant monitoring and evaluation of the print format, with the brightness of the recording medium having no influence on the monitoring precision. A sensor head with at least two wiper electrodes is placed on the recording medium following the ink print head and is connected to an evaluation circuit that in turn has an output side connected to the drive circuit for the ink print head. Changes in the electrical properties of the recording medium between the wiper electrodes are acquired in the evaluation circuit, these changes arising due to the presence of just-printed ink thereon. The arrangement is suitable for ink print heads operating according to the bubble jet principle as well as for ink print heads with piezo actuators.

REFERENCES:
patent: 4145697 (1979-03-01), Ballinger
patent: 4345845 (1982-08-01), Bohnhoff et al.
patent: 4425569 (1984-01-01), Kawanisi et al.
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patent: 4768045 (1988-08-01), Koto
patent: 4934846 (1990-06-01), Gilham
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patent: 5255020 (1993-10-01), Martin et al.
patent: 5321436 (1994-06-01), Herbert
patent: 5457389 (1995-10-01), Shibata

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