Browse Prior Art Database

DUAL ROLL CLEANING APPARATUS FOR A CHARGE RETENTIVE SURFACE

IP.com Disclosure Number: IPCOM000025984D
Original Publication Date: 1989-Jun-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 4 page(s) / 168K

Publishing Venue

Xerox Disclosure Journal

Abstract

In certain electrophotographic processes, and particularly in highlight color applications that provide two types of toner to develop latent images on a surface, a phenomenon of filming is noted. Filming is characterized by the tenacious adherence of very fine toner material residues, toner additives and paper debris to the charge retentive surface. For reasons that are not clearly understood, brush cleaning is not an effective cleaning device in systems where a high degree of filming is present. Film cleaning can be improved in brush cleaners by stiffening the brush fibers, but film still remains on the surface, Foam roll .cleaners provide satisfactory abrasion to break the tenacious adhesion of toner to the charge retentive surface, but are unsatisfactory for cleaning as primary cleaners. Additionally, it is difficult to remove toner collected by the foam roll from its surface. Accordingly a cleaning system is proposed having the desirable cleaning qualities of a brush cleaner for primary removal of toner, but also provides the scouring capability of foam roll cleaners

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 55% of the total text.

Page 1 of 4

KEROX DISCLOSURE JOURNAL

DUAL ROLL CLEANING APPARATUS Proposed Classification FOR A CHARGE RETENTIVE SURFACE U.S. C1.355/15
Cyril G. Edmunds Int. Cl. G03g 21/00

MOTOR d

100

- 110

/ 150

Volume 14 Number 3 May/June 1989 153

\

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

Page 2 of 4

DUAL ROLL CLEANING APPARATUS FOR A CHARGE RETENTIVE SURFACE (Cont'd)

In certain electrophotographic processes, and particularly in highlight color applications that provide two types of toner to develop latent images on a surface, a phenomenon of filming is noted. Filming is characterized by the tenacious adherence of very fine toner material residues, toner additives and paper debris to the charge retentive surface. For reasons that are not clearly understood, brush cleaning is not an effective cleaning device in systems where a high degree of filming is present. Film cleaning can be improved in brush cleaners by stiffening the brush fibers, but film still remains on the surface, Foam roll .cleaners provide satisfactory abrasion to break the tenacious adhesion of toner to the charge retentive surface, but are unsatisfactory for cleaning as primary cleaners. Additionally, it is difficult to remove toner collected by the foam roll from its surface. Accordingly a cleaning system is proposed having the desirable cleaning qualities of a brush cleaner for primary removal of toner, but also provides the scouring capability of foam roll cleaners

For toner removal from a photoreceptor belt 10, moving in a process direction 16, cleaning station F includes housing 100 supportin a plastic foam or

relationship with belt 10. Foam cleaning roll 102 is supported downstream in process direction 16 from cleaning brush 104, journaled for rotating movement, and driven with a motor 108 in the counterclockwise direction 106. Foam cleaning roll 102 has an outer surface 109 with a large number of pores formed therein. As the porous surface of the roll collects toner from the surface of belt 10, toner particles lodge in the pores. As these toner particles are carried in the pores past the surface of belt 10, they tend to abrade or scour the surface, to removing accumulating films. Toner collecting on the roll surface 109 is carried out of the cleaning nip between foam roller 102 and belt 10 by the roll rotation, into an area where it may be collected by a directed airflow created, for example, by fan or blower 110 arranged in a toner removal passage 112, through which toner is directed for storage or return to the developer housing. A doctor blade 114 supported on a wall of housing 100 may be used to aid in the release of toner from the surface of the poromeric roll 102, as may other mechanical release devices useful in obtaining toner release from foam rolls.

poromeric cleaning roll...