International Business Machines Corporation

Danny Allen Van Hook

Van Clifton Martin

Sidney Jared Fox

Edward T Osborne

Fouling of an electrostatic ink jet head is sensed and causes shutoff of the head and of the associated electronics. The fouling is sensed by detecting contamination of the charge electrodes or of the deflection plates by conductive ink, the detection being by sensitive circuitry employing diodes.

Ink jet contamination detecting system

A pair of detectors provide signals coincident with the circumferential and axial edges of a print medium mounted on a rotating media support drum. These signals are used to control counters which respond to an emitter circumferentially disposed with respect to the drum to generate a preset or offset signal value and a gate signal to accommodate axial and circumferential misalignment of the print medium on the drum.

Media skew compensator

An ink jet copier is provided with a document scanner which scans a document to be copied one line at a time producing non-coded binary data. The binary data is inserted in storage in a predetermined arrangement. Stored data is removed from selected predetermined locations in accordance with an algorithm and applied to a plurality of ink jet nozzles arranged in multiple linear arrays about the circumference of a rotating paper drum. The data signals selectively applied to the ink jet printers control the deposition of ink on the paper supported on the rotating drum to cause the reproduction of the original scanned image on a predetermined interlaced basis.

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Boulder, CO, United States of America

Danny Allen Van Hook