Xerox Corporation

Michel Loiselle

Raymond Ruthenberg

Robert H Brown

Perry C Dong

David C Van Wyngaarden

Richard Biasutto

Mark Muzzin

John Wojtkowicz

Wayne R Jordan

Karen Lee

Mathieu King

An apparatus monitors the motion of sheet, such as in a digital printer. An optical sensor is capable of recording an image in a two-dimensional array of pixels, and has acuity to recognize a terrain of a small area on a sheet that is substantially blank to a human eye. The optical sensor views a portion of a sheet moving in a process direction through a path. A detection system compares at least two recorded terrain images from the sheet, thereby directly measuring velocity and direction of the sheet.

Optical sensor for monitoring motion of a blank sheet

An improved method for monitoring stack quality in a finisher of a printer includes examining the net displacement of a compiling tray after each set has been ejected. A deviation from the normal increments of displacement for each set triggers a 'tray full' condition which alerts a user to empty the tray.

Stack quality monitoring algorithm

An improved sloped stack detection system for a multi-function finisher includes a reflective sensor which suspends the conveying of stapled sets to an output tray when staple build-up in small stapled sets causes the stacked output to become sloped.

Sloped stack detection sensor and algorithm

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Brampton, Canada

Michel Loiselle