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RETRACTING SPOTS BLADE AND PHOTORECEPTOR DRAG SHARING

IP.com Disclosure Number: IPCOM000027602D
Original Publication Date: 1998-Feb-28
Included in the Prior Art Database: 2004-Apr-08
Document File: 2 page(s) / 104K

Publishing Venue

Xerox Disclosure Journal

Abstract

A method is disclosed for reducing overall photoreceptor drag by engaging a spots blade only when an Acoustic Transfer Assist (ATA) vacuum is off. The drag due to the ATA will be minimum, and the drag due to the spots blade will be maximum. When the ATA vacuum is turned on, the spots blade will be retracted from the photoreceptor. By sharing the drag between the ATA and the spots blade, overall drag on the photoreceptor, at any time, will be lower.

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XEROX DISCLOSURE JOURNAL

RETRACTING SPOTS BLADE AND PHOTORECEPTOR DRAG SHARING
D. Gregory Gerbasi Bruce E. Thayer Clark V. Lange Daniel W. Costanza Nero R. Lindblad

Proposed Classification
U. S. C1.3991350 Int. C1. G03g 21/00

A method is disclosed for reducing overall photoreceptor drag by engaging a spots blade only when an Acoustic Transfer Assist (ATA) vacuum is off. The drag due to the ATA will be minimum, and the drag due to the spots blade will be maximum. When the ATA vacuum is turned on, the spots blade will be retracted from the photoreceptor. By sharing the drag between the ATA and the spots blade, overall drag on the photoreceptor, at any time, will be lower.

In electrophotographic machines where an image builds on a photoreceptor in several revolutions, the spots blade must be retracted or damage occurs to the image. There are two concerns with a retracting spots blade:

I. The effect the blade has on photoreceptor motion quality.

    A. With the blade riding on the photoreceptor there is a frictional drag. When the blade is retracted and cammed back onto the photoreceptor, the drag on the photoreceptor changes. It is well known in a multiple pass color system that registration is important when an image-on-image is being developed. If the blade drag effects motion quality, then retracting the spots blade is not feasible.

11. The effect the spots blade has on a latent image.

    A. When the spots blade is located between charging and imaging stations, the blade drag on the photoreceptor creates concerns that charge uniformity may be effected due to tribo charging of the surface. With the blade engaged, charge on the photoreceptor may change gradually to a limiting value. It may be non-uniform across the width of the photor...