Xerox Corporation

Charles D Wilson

Charles J Urso, Iii

John E Courtney

This invention is a scanning array for sequentially converting portions of an image of a document into digital format, a print head for sequentially printing those portions of the image onto a receiving means, logic circuitry interconnecting the scanning array and the print head, and a stepper motor connected to the scanning array and the print head to step the scanning array in a first direction while at the same time stepping the print head in a second direction. Control circuitry is also provided to enable the scanning array to scan in the first direction asynchronously with the print head printing the image in the second direction. A second stepper motor is included to index the copy sheet past the scanning array and the print head.

Image reproducing apparatus with CCD scanner and bubble jet printer

A photoreceptor dark current leakage detecting device for use in determining the temperature induced current leakage of photoreceptors. The device as aforesaid comprises a miniature copy of, or segment from a photoreceptor class with electrical leads attached thereto and by means of which a reference bias can be applied thereacross. A current sensing meter introduced in circuit with the device measures current leakage. In a second embodiment, output from the device controls the operating bias on one or more of the components of an electrostatic reproduction machine to compensate for changes in photoreceptor current leakage.

Photoreceptor dark current leakage detecting apparatus for xerographic

A copier or reproduction machine of the type having a photoconductive plate, corona generating means to charge the plate in preparation for imaging thereof, exposure means to expose the charged plate to a light image of the original being copied, developer means to apply developing material to the electrostatic image, and transfer means for transferring the developed image to a support material, i.e., a copy sheet. To enable the electrostatic development field between the photoconductive plate and the developer section to be controlled and thereby enhance development, an automatic potential controller, which includes an electrometer, is provided. The electrometer includes a probe section arranged to sense voltages on the plate, the electrometer serving to provide a signal reflecting plate potentials. The electrometer signal is used by the controller to automatically adjust the electrostatic development field, as by controlling the voltage bias applied to the developer. The electrometer includes its own internal power supply for the electrometer components, and circuit means are provided to utilize the internal power supply, regulated by the controller itself in response to changes in the electrostatic development field, as the source of bias for the developer and for the electrometer itself thereby obviating the need for separate and duplicate power supplies.

Controller for reproduction apparatus

Apparatus to enable potentials applied to various operating components of an electrostatic type reproduction machine to be measured by an electrostatic voltmeter. In one embodiment, the apparatus comprises structures designed to place the sensing element of the voltmeter in predetermined spaced relationship with a test plate, the test plate being electrically connectable to the source of potential to be measured. In another embodiment, the apparatus locates the voltmeter sensing element in predetermined spaced relation with both the reproduction machine photoreceptor and the test plate. As a further alternative, a source of calibrating potential is provided for use in calibrating the voltmeter through the test plate.

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Pittsford, NY, United States of America

Charles D Wilson