Xerox Corporation

James Patrick Kitchen

Eric Michael Gross

Patricia Joanne Donaldson

John Stephen Facci

James A Winters

Richard L Forbes, Ii

Robert M Mara

Jeffrey Michael Gramowski

Michele Donna Cleary

John G Elliot

A method for calibration of an optical sensor to scan printed marks in a printer includes operating inkjets to form printed marks on an image receiving surface and activating the optical sensor after the image receiving surface moves a predetermined distance to generate scanned image data of a region of the image receiving surface that is longer than the region containing the printed marks. The method includes identifying an error between the location of the printed marks in the scanned image data and a predetermined expected location for the marks, and adjustment of the distance that the image receiving surface moves prior to activation of the optical sensor to correct the error.

Method for calibrating optical detector operation with marks formed on a moving image receiving surface in a printer

A computer implemented method of cleaning electrodes (such as wires) is used in a toner-based electrostatic printing device. The electrodes produce an environment containing charged toner particles to assist in electrostatic printing. The method automatically monitors at least two printing parameters that are unrelated to signals and voltages provided to the electrodes (using a processor of the electrostatic printing device). Further, this method also uses the processor automatically infers a toner contamination of the electrodes from the printing parameters. This allows the processor to automatically adjust the printing the used by the electrostatic printing device during electrostatic printing to maintain the contamination of the electrodes below a threshold.

Inferring toner contamination of electrodes from printing parameters

A system is provided that determines the amount of toner on a photo receptor in a xerographic operation. A photo receptor is charged in one or more locations to create an image. A developer places a patch of a predetermined amount of toner onto the one or more charge locations of the photo receptor. A light emitting diode projects light onto the photo receptor, wherein the intensity of the light varies based on the voltage provided to the LED. An optical reflective sensor measures the reflectance of the toner placed on the photo receptor, the amount of reflectance of the toner is related in a known way to the intensity of the LED. A direct relationship between LED intensity and the reflectance of the toner allow for accurate extrapolation at LED intensities greater than the point of saturation.

Electrophotographic system to enable direct sensing of toner quantity

An electrostatic printing machine having a plurality of color stations having a system for maintaining a preset toner age in each of the plurality of color stations, including: determining a toner age for each of the plurality of color stations; determining if purge while run is required based on the toner age for each of the plurality of color stations; defining an area on a unused portion of an imaging frame for a purge patch, the defining includes sizing a plurality of purge patch regions wherein each of the purge patch regions may have a different size; allocating each of the plurality of purge patch regions to at least one color plane from a group of color separations.

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Webster, NY, United States of America

James Patrick Kitchen