Print head unit and method and device for evaluation of the prin

Details Print head unit and method and device for evaluation of the prin Print head unit and method and device for evaluation of the prin

1997-09-19

2000-06-20

Royer, William

Incremental printing of symbolic information

Ink jet

Controller

347 50, 347 59, 347211, B41J 29393

Patent

active

060769149

ABSTRACT:
To provide a print head unit and device and a method for evaluation of the print head unit without performing a printing operation. A current probe 21 detects a head ground current, which corresponds to a driving circuit output current. A current-voltage converter 22 converts the head ground current to a voltage level. Then, an integrating device integrates the voltage level to a waveform which corresponds to the head ground current. By comparing the produced waveform with a proper waveform one can determine, whether the print head unit is operational.

REFERENCES:
patent: 4769657 (1988-09-01), Takahashi
patent: 5073786 (1991-12-01), Shimada et al.
patent: 5422662 (1995-06-01), Fukushima et al.
patent: 5642148 (1997-06-01), Fukushima et al.

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