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TWO-POSITION EDGE FADEOUT DEVICE

IP.com Disclosure Number: IPCOM000024369D
Original Publication Date: 1980-Jun-30
Included in the Prior Art Database: 2004-Apr-02

Publishing Venue

Xerox Disclosure Journal

Abstract

The device illustrated above is a shutter, and its activation mechanism is for use in a drum-type electrophotographic copying machine, which accommodates two lengths of paper such as, for example, 8K" x 11" and 85" x 14". In order to maintain the machine in as clean a condition as possible, it is customary to eliminate the electrostatic charge from non-image areas of the photoreceptor drum prior to the development step. The illustrated device operates in amjunction with a fluorescent lamp following the exposure slit of the copier. For 8K" x 11" paper fed parallel to the short dimension, the electromagnet 2 is left de-energized, and the shutter 1 illuminates the drum in a wide zone, erasing charge beyond the 11-inch length of the photoreceptor drum. For 8K" x 14" paper also fed parallel to the short dimension, the electromagnet 2 is energized, as shown in the drawing, allowing the shutter 1 to illuminate a narrow zone, erasing charge beyond a 14-inch length of the drum.