Browse Prior Art Database

MAGNETIC BRUSH DEVELOPMENT SYSTEM

IP.com Disclosure Number: IPCOM000023720D
Original Publication Date: 1978-Dec-31
Included in the Prior Art Database: 2004-Mar-31
Document File: 2 page(s) / 396K

Publishing Venue

Xerox Disclosure Journal

Abstract

In a magnetic brush developer unit 1 as shown in Figure 1, the developer material (magnetic toner, or toner/magnetic carrier mixture), with which the electrostatic latent image on the photoreceptor surface 2 is developed, is transported, as shown by the arrow path line, up the backsides of up to four rotating magnetic brush development rollers 3, 4, 5, 6, to the top of the development zone, and then transported down the frontsides of these same rollers to develop the image. Separate lifting conveyors or rollers for the magnetic toner or toner/magnetic carrier mixture are not required.

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Page 1 of 2

XEROX DISCLOSURE JOURNAL

MAGNETIC BRUSH DEVELOPMENT
SYSTEM
John C, Witte

Proposed Classification
U.S. Cl. 118/633
mt. Ci, B05b 5/02

FIG. /

7

FIG. 2

Volume 3 Number 6 November/December 1978 405

/3

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

Page 2 of 2

MAGNETIC ERUSH DEVELOPMENT SYSTEM (Cont~d)

In a magnetic brush developer unit 1 as shown in Figure 1, the
developer material (magnetic toner, or toner/magnetic carrier
mixture), with which the electrostatic latent image on the
photoreceptor surface 2 is developed, is transported, as shown
by the arrow path line, up the backsides of up to four rotating
magnetic brush development rollers 3, 4, 5, 6, to the top of
the development zone, and then transported down the frontsides
of these same rollers to develop the image. Separate lifting
conveyors or rollers for the magnetic toner or toner/magnetic
carrier mixture are not required.

Figure 2 is an enlarged view of the interface between two of
the rollers 3, 4, 5, or 6, showing the inter-~relations of
their magnetic fields, The nip size or gap between the two
rotating roll shells 7 and 8 is exaggerated for drawing
clarity. The illustrated configuration of the respective
roller magnet sets solves a problem in high speed operation
known as "diving" of the developer material between or through
the spaces between rolls 3, 4, 5, 6, due to the momentum of the
material. This can cause mechanical interference or wear as
well as development variations. Double, opposing, magnetic
guard poles 9...