Browse Prior Art Database

ELECTROSTATOGRAPHIC COPYING SYSTEM

IP.com Disclosure Number: IPCOM000023577D
Original Publication Date: 1978-Apr-30
Included in the Prior Art Database: 2004-Mar-31
Document File: 2 page(s) / 207K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is an electrostatographic copying system including means for uniform charging, imagewise exposure, charge pattern development and transfer. A transfer roll is used which includes an electrically biased conductive core having coated thereon a variable-resistivity-with-pressure material. Elec-trically biased transfer of the developed charge pattern is accomplished while air breakdown and undesirable air ioniza-tion are avoided. The transfer means such as the transfer roll is in pressure contact with the imaging surface and presses the receiving surface into contact with the developing image.

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XEROX DISCLOSURE JOURNAL

ELECTROSTATOGRAPHIC COPYING Proposed Classification
SYSTEM U.S. Cl. 96/1.4
David E. Damouth Int. Cl. G03g 13/14

Disclosed is an electrostatographic copying system including
means for uniform charging, imagewise exposure, charge pattern
development and transfer. A transfer roll is used which
includes an electrically biased conductive core having coated
thereon a variable-resistivity-with-pressure material. Elec-
trically biased transfer of the developed charge pattern is
accomplished while air breakdown and undesirable air ioniza-
tion are avoided. The transfer means such as the transfer
roll is in pressure contact with the imaging surface and
presses the receiving surface into contact with the developing
image.

Examples of coatings inglude those materials having a resis-
tivity of~from about 10 ohm cm. in an uncompressed state to
about 10 ohm cm. in a slightly compressed state, such as
conductive composite elastomers, i.e., a silicone rubber
filled with a small amount of finely divided conductive
particles such as silver, copper or nickel.

Volume 3 Number 2 March/April 1978 93

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