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DEVELOPMENT ARRANGEMENT

IP.com Disclosure Number: IPCOM000023419D
Original Publication Date: 1977-Oct-31
Included in the Prior Art Database: 2004-Mar-30
Document File: 2 page(s) / 299K

Publishing Venue

Xerox Disclosure Journal

Abstract

An arrangement for developing electrostatic images on a photo-conductive imaging surface 2 of an electrostatic machine including a sump or reservoir 3 in which a supply of toner marking particles 4 is maintained. The toner 4 in the reser-voir is delivered by gravity to a open-cel1 foam donor roll 5 which is mounted for rotation on a shaft adjacent an applica-tor or development roll 7. The development roll is made of non-magnetic material and has housed within it permanent magnets 10 and 11, the surface of the roll 7 being coated with a suitable layer of magnetic carrier particles.

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XEROX DISCLOSURE JOURNAL

DEVELOPMENT ARRANGEMENT
ProposedJohn Johnston Classification
tJ.S. Cl. 118/644
mt. Cl. B05b 5/02

3

An arrangement for developing electrostatic images on a photo~
conductive imaging surface 2 of an electrostatic machine
including a sump or reservoir 3 in which a supply of toner
marking particles 4 is maintained. The toner 4 in the reser~
voir is delivered by gravity to a open~cel1 foam donor roll 5
which is mounted for rotation on a shaft adjacent an applica~
tor or development roll 7. The development roll is made of
non~magnetic material and has housed within it permanent
magnets 10 and 11, the surface of the roll 7 being coated with
a suitable layer of magnetic carrier particles.

In operation, as the donor roll 5 rotates, its pores or open~
ings are filled with toner from the supply 3. Subsequent
rotation of the donor roll into close relationship with the
developer roll 7 permits the toner to be drawn by electro~
static forces from the pores of the donor to the carrier on the
surface of the developer roll 7 as is needed by the process.
Continuous rotation of the roll 7 brings the toner~carrier
mixture into contact with the surface 2 to develop latent
electrostatic images thereon.

Volume 2 Number 5 September/October 1977 51

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                 XEROX DISCLOSURE JOURNAL
52 Volume 2 Number 5 September/October 1977

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