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Magnetic Conveyor Roll

IP.com Disclosure Number: IPCOM000081767D
Original Publication Date: 1974-Aug-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 73K

Publishing Venue

IBM

Related People

Daniels, RA: AUTHOR [+2]

Abstract

A magnetic conveyor roll utilizes an extruded magnet assembly located, internal of the roll which generates approximately uniform normal and tangential fields, thereby providing adequate conveying forces while minimizing stray-field affects.

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Magnetic Conveyor Roll

A magnetic conveyor roll utilizes an extruded magnet assembly located, internal of the roll which generates approximately uniform normal and tangential fields, thereby providing adequate conveying forces while minimizing stray-field affects.

A magnetic conveyor roll 11, rotating in the direction of arrow 13, conveys developer material comprising magnetic carrier particles and toner to a magnetic brush developing roll 15. The developer material is located within a sump 17 and is stirred by counterrotating augers 18, 19, and falls by gravity through metering gate 21 to an area adjacent roll 11.

A magnet assembly 23, extruded in a cylindrical shape, is affixed to steel shunt 25 and generates a magnetic field at the surface of the roll 11, as depicted in Fig. 2. Both the tangential and normal field components are in the range of 350-400 gauss, thereby providing a strong enough field to convey the developer mass to roll 15 but insufficient in strength to produce stray fields in the area 27, thereby eliminating any undesired stagnant pools of developer material.

Excess developer material is removed from the magnetic brush 15 by the bead control device 29 and freely falls on the backside of conveyor roll 11, to be again transported and mixed with fresh developer material.

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