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TRANSFER APPARATUS

IP.com Disclosure Number: IPCOM000023240D
Original Publication Date: 1977-Feb-28
Included in the Prior Art Database: 2004-Mar-29
Document File: 2 page(s) / 321K

Publishing Venue

Xerox Disclosure Journal

Abstract

In a copying apparatus in which an image of charged parti-cles of imaging material is electrostatically transferred from the initial imaging surface 12, here the xerographic drum 10, to a copy sheet 34. The copy sheet 34 is positive-ly retained on a vacuum belt 38A in its passage through the transfer area D, by vacuum applied to a vacuum chamber 70 communicating with the rear of the belt while the copy sheet is carried on the front of the belt. Transfer is accompli-shed by a transfer corotron 72 applying transfer charges to the rear of the belt. Hole print-out, i.e., transfer dis-turbance due to the vacuum apertures 40 in the belt, is prevented yet desirably large clogging-resistant vacuum apertures and a desirably relatively thick belt can be utilized by making the belt of an electrically relaxable material having a resistivity of between approximately

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Page 1 of 2

XEROX DISCLOSURE JOURNAL

TRANSFER APPAPJ~TtJS
Ci.U.S.ProposedN'arendra S., Goel Classification355/3R
mt. CL G03b 27/52

In a copying apparatus in which an image of charged parti-
cles of imaging material is electrostatically transferred
from the initial imaging surface 12, here the xerographic
drum 10, to a copy sheet 34. The copy sheet 34 is positive-
ly retained on a vacuum belt 38A in its passage through the
transfer area D, by vacuum applied to a vacuum chamber 70
communicating with the rear of the belt while the copy sheet
is carried on the front of the belt. Transfer is accompli-
shed by a transfer corotron 72 applying transfer charges to
the rear of the belt. Hole print-out, i.e., transfer dis-
turbance due to the vacuum apertures 40 in the belt, is
prevented yet desirably large clogging-resistant vacuum
apertures and a desirably relatively thick belt can be
utilized by making the belt of an electrically relaxable
material having a resistivity of between approximately

33,5 x io-~ ohm-centimeters and 8.3 x l0~T2 ohm-centimeters
k k
where T is the belt thickness measured to millimeters and k

I

/2

sea

Volume 2 Number 1 January/February 1977 59

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

Page 2 of 2

TRANSFER APPARATUS (Cont'd)

is the dielectric constant of the belt material. The elec-
trically relaxable material conducts the transfer charges
through the belt in the transfer area to the upper surface
of the belt 34 to provide substantially equal transfer
fields in the ape...