Browse Prior Art Database

ELECTRO-MAGNETIC DEVELOPER ROLL SWITCHING

IP.com Disclosure Number: IPCOM000026346D
Original Publication Date: 1991-Jun-30
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 90K

Publishing Venue

Xerox Disclosure Journal

Abstract

An electro-magnetic developer roll switching system for two component development in electrophotographic printing and copying machines is disclosed. Switching a developer roll function on and off is important in developer configurations where more than one development system is operated in conjunction with a single photoreceptor and where spatial separation of the respective developers is required.

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ELECTRO-MAGNETIC Proposed Classification DEVELOPER ROLL SWITCHING
Joseph A. Seyfried

U.S. C1. 355/259 Int. C1. G03g 15/06

XEROX DISCLOSURE JOURNAL - Vol. 16, No. 3 May/June 1991 191

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ELECTRO-MAGNETIC DEVELOPER ROLL SWITCHING (cont'd)

An electro-magnetic developer roll switching system for two component development in electrophotographic printing and copying machines is disclosed. Switching a developer roll function on and off is important in developer configurations where more than one development system is operated in conjunction with a single photoreceptor and where spatial separation of the respective developers is required.

Conventional systems employ mechanical switching via electro-mechanical means, for example, using dedicated motors or electro-mechanical clutches. A developer housing using a two-component developer material and an electro-mechanical clutch will typically use a friction clutch to engage the housing or developer roll, which minimizes start up shock and effectively controls the developer material.

However, while the friction clutch offers smooth acceleration of the developer housing or roll, the friction clutch is limited to use in smaller scale applications for given torque ratings, especially for smaller radial dimension developer rolls. Electro-mechanical wrap spring clutches offer advantages over friction clutches, for example, in the ratio of rated torques to radial size...