Browse Prior Art Database

MAGNET FOR TONER CONTAMINATION CONTROL

IP.com Disclosure Number: IPCOM000025540D
Original Publication Date: 1986-Feb-28
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 61K

Publishing Venue

Xerox Disclosure Journal

Abstract

In an electrophotographic printing machine, an electrostatic latent image IS recorded on a photoconductive member maybe a moving belt or drum which advances to the development station. Preferably, the development station employs a magnetic brush development system. The magnetic brush development system includes a housing having magnetic brush transport roll disposed therein and adapted to advance toner particles to the latent image recorded on the photoconductive member. In the development housing, there are two areas, one on each end of the magnetic brush transport roll, where clearance must be provided between the housing walls and the rotating magnetic brush roll. As a result of this clearance, an opening exists at each end of the roll through which toner particles may escape from the housing into the printing machine contaminating other subsystems thereof. Magnets may be positioned under the trim bar at the ends of the magnetic brush roll. Each magnet has a North and South pole having a strength of about 450 gauss. The magnets form a chain of carrier granules that effectively close the gap between the moving roll and the housing in this region and significantly reduce toner contamination, A magnetic seal of this type does not affect the relatlve motion between the housing and roll while still restricting the toner laden air from flowing outwardly from the housing.

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 85% of the total text.

Page 1 of 2

XEROX DISCLOSURE JOURNAL

MAGNET FOR TONER CONTAMlNATION CONTROL U.S. CI. 118/637 Richard A. Lux
Barbara A. Hilt

Proposed Classification

Int. C1. B05b 5/02

In an electrophotographic printing machine, an electrostatic latent image IS

recorded on a photoconductive member maybe a moving belt or drum which advances to the development station. Preferably, the development station employs a magnetic brush development system. The magnetic brush development system includes a housing having magnetic brush transport roll disposed therein and adapted to advance toner particles to the latent image recorded on the photoconductive member. In the development housing, there are two areas, one on each end of the magnetic brush transport roll, where clearance must be provided between the housing walls and the rotating magnetic brush roll. As a result of this clearance, an opening exists at each end of the roll through which toner particles may escape from the housing into the printing machine contaminating other subsystems thereof. Magnets may be positioned under the trim bar at the ends of the magnetic brush roll. Each magnet has a North and South pole having a strength of about 450 gauss. The magnets form a chain of carrier granules that effectively close the gap between the moving roll and the housing in this region and significantly reduce toner contamination, A magnetic seal of this type does not affect the relatlve motion between the housing and roll while still restricting th...