Browse Prior Art Database

A.C. CLEANING BLADE ARRANGEMENT

IP.com Disclosure Number: IPCOM000025970D
Original Publication Date: 1989-Jun-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 4 page(s) / 257K

Publishing Venue

Xerox Disclosure Journal

Abstract

In a cleaning arrangement for the removal of residual toner from a charge retentive surface, such as a photoreceptor surface in a reproduction machine, after a transfer step, a conductive cleaning member is arranged transversely across and closely adjacent the surface. An A.C. voltage of a selected voltage f is applied to the member to produce an A.C. field at the edge of the blade adjacent the photoreceptor. In such an arrangement, toner in the vicinity of the member is observed to jump from the surface in response to the electric field created at the member, forming an oscillating toner cloud. The agitated toner further aids in removal of toner from the surface by causin a large

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XEROX DISCLOSURE JOURNAL

A.C. CLEANING BLADE ARRANGEMENT William L. Goffe
Joseph G. Schram

Proposed Classification
U.S. c1.355/3 Int. C1. G03g 15/00

10

12'

FIG. 1

-

50 9

I

/ 7

10

12

FIG. 2

Volume 14 Number 3 May/June 1989

119

[This page contains 1 picture or other non-text object]

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AC CLEANING BLADE ARRANGEMENT(Cont'd)

In a cleaning arrangement for the removal of residual toner from a charge retentive surface, such as a photoreceptor surface in a reproduction machine, after a transfer step, a conductive cleaning member is arranged transversely across and closely adjacent the surface. An A.C. voltage of a selected voltage f is applied to the member to produce an A.C. field at the edge of the blade adjacent the photoreceptor. In such an arrangement, toner in the vicinity of the member is observed to jump from the surface in response to the electric field created at the member, forming an oscillating toner cloud. The agitated toner further aids in removal of toner from the surface by causin a large

movement. Toner held on the surface is thus removed electrostatically and mechanically. Toner in the cloud configuration may be easily removed from the cleaning member vicinity in a variety of ways.

With reference to Figure I, a cleaning station F is generally comprised of a cleaning housing 100, within which an A.C. biased cleaning member is supported for removal of residual toner from a charge retentive surface. In a first embodiment, cleaning blade 102 is supported on a somewhat flexible support member 104 transversely across, and with blade edge 106 in light contact with photoreceptor belt 10. Cleanin blade 102 may be a conductive

production. A glass blade with a suitable coronode material supported thereon or therein may also be possible. A variety of cross-sectional edge shapes of the blade are ossible, keeping in mind that corona is best produced at an edge, A

corona might be produced. Blade 102 is supported on a flexible member 104
that will assist in maintaining conformance of the blade edge to the belt 10,
which in the case of an AMAT belt, has a tendency to flex. Flexible member 104 may not be required in the case of a rigid selenium drum. While it is preferred that the blade be supported in light contact with photoreceptor belt 10, in order to maintain the electric field created at the blade edge 106 at a constant level, the cleanin action of the inventive arrangement occurs about 1

spacing between the blade 102 and belt 10.

In operation, the A.C. biased blade operation depends upon applied voltage, applied frequency and relative speed between the photoreceptor surface and the blade. Blade 102 is biased with a high voltage A.C. power supply 108 having a voltage suitable for the production of corona at blade edge 106. Typical satisfactory voltages are in the ran e of 600 to 1000 volts, or higher.

spacing between the blade edge and the photoreceptor will require higher voltages to maintain the cleaning function. The ou...