Optical sensor for monitoring motion of a blank sheet

Details Optical sensor for monitoring motion of a blank sheet Optical sensor for monitoring motion of a blank sheet

2005-01-31

2008-10-14

Nguyen, Anthony H. (Department: 2854)

Electrophotography

Document handling

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C399S395000

Reexamination Certificate

active

07437120

ABSTRACT:
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.

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