Browse Prior Art Database

DEVELOPER ROLL BIAS STABILZATION

IP.com Disclosure Number: IPCOM000026052D
Original Publication Date: 1989-Dec-31
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 66K

Publishing Venue

Xerox Disclosure Journal

Abstract

In a two-roll xerographic developer, of which the two rolls rotate in opposite directions, an 'against' direction and a 'with' one (referring to the directions of relative movement in their nips with the common photoreceptor), excess toner often migrates to the against roll and its transferred to the photoreceptor, where it is deposited on the background.

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XEROX DISCLOSURE JOURNAL

DEVELOPER ROLL BIAS STABIL- ZATION US. C1.355/246
A. R. Delhomme

Proposed Classification

Int. C1. G03g 21/00

Volume 14 Number 6 NovembedDecember 1989 307

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

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DEVELOPER ROLL BIAS STABILIZATION (Cont'd)

In a two-roll xerographic developer, of which the two rolls rotate in opposite directions, an 'against' direction and a 'with' one (referring to the directions of relative movement in their nips with the common photoreceptor), excess toner often migrates to the against roll and its transferred to the photoreceptor, where it is deposited on the background.

In this invention, this excess toner is prevented from remaining on, or being attracted to, the against roll by using a charged conductor close to, or in contact with, the surface of the against roll.

As shown in the drawing, secured to the cross mixer valance 2 is a plate 4

from which projects an arm 6 of insulation material. Mounted on the outer end of the arm is a conductive brush 8, which meets the against roll 10 at an acute angle to the vertical. The brush is charged to 600 k 25 V DC. The resultant field develops any excess toner off the against roll. Any such toner ejected above the brush is able to fall under gravity through slots 12 in arm 6 to become mixed into toner carried by the with roll 14.

The brush could be replaced by a solid conductor spaced slightly from the against roll.

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