Browse Prior Art Database

FLOATING DEVELOPMENT ELECTRODE

IP.com Disclosure Number: IPCOM000023874D
Original Publication Date: 1979-Feb-28
Included in the Prior Art Database: 2004-Apr-01
Document File: 2 page(s) / 267K

Publishing Venue

Xerox Disclosure Journal

Abstract

In single component development of an electrostatic latent image, halos surrounding the resultant image can be prevented by using small electrode to photoreceptor spacing. However, the small spacing is difficult to maintain in a commercial copier. Variations in the spacing produce changes in image density and

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XEROX DISCLOSURE JOURNAL

FLOATING DEVELOPMENT ELECTRODE Proposed Classification

L. Bean U.S. Cl. 427/145

mt. CL B41m 5/16

/4

~

/0

In single component development of an electrostatic latent image, halos surrounding the resultant image can be prevented by using small electrode to

photoreceptor spacing. However, the small spacing is difficult to maintain in a commercial copier. Variations in the spacing produce changes in image density and

background. In addition, the toner flowing through the development zone often blocks the photoreceptor/electrode spacing. This may cause image deletion. In order to obviate the foregoing problems, a conductive magnetic member 10 is positioned in the nip of development zone 12. The diameter of magnetic member

10 is always greater than the spacing between the development roller 14 and photoconductor 16. Toner particles travel in the direction of arrows 18, However,

once the magnetic member 10 enters the vicinity of the photoconductive surface, it is maintained a fixed distance with respect to roller 14 and photoconductive

member 16. This distance is determined by the forces applied on magnetic member 10 by the toner particles moving with the photoconductive surface. Thus, magnetic

member 10 is self-spacing. This self-spacing concept can be modified such that the magnetic requirement is no longer utilized. In such a modification, the force driving member 10 into the exit nip is supplied by gravity or by a mechanical spring. The sprin...