Ink jet short detection circuit

Details Ink jet short detection circuit Ink jet short detection circuit

B - Operations, Transporting

41

J

B41J 2/195 (2006.01) B41J 2/07 (2006.01) B41J 2/125 (2006.01) B41J 2/185 (2006.01)

Patent

CA 2189284

A detection technique comprises a plurality of closely spaced, continuous detection electrodes placed immediately below and along the length of a charge plate in an ink jet printing system. The detection electrodes typically comprise parallel conductors. A circuit is provided for monitoring the conductivity between the electrodes. The electrodes are electrically isolated from one another when properly placed on the catcher surface. If the conductivity, as measured by the circuit, rises above a predetermined threshold level it is an indication that some amount of unwanted ink is present at the location of the conductors. This signals improper print head operation requiring a print head shut-down and/or clean cycle.

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