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PRE-TRANSFER BAFFLE ISOLATION NETWORK

IP.com Disclosure Number: IPCOM000025183D
Original Publication Date: 1983-Dec-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 75K

Publishing Venue

Xerox Disclosure Journal

Abstract

In high humidity environments (8 3h and higher), copy deletions occur when the paper contacts the transfer dicorotron field and a grounded pre-transfer baffle at the same time. This occurs because the surface resistivity of the paper is lower at high Rh which provides a path for the transfer field to the grounded baffle.

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CEROX DISCLOSURE JOURNAL

PRE-TRANSFER BAFFLE ISOLATION NETWORK
John H. Steele

FRAME

Proposed Classification
U.S. Cl. 355/3R Int. CI. G03g 15/00

In high humidity environments (8 3h and higher), copy deletions occur when the paper contacts the transfer dicorotron field and a grounded pre-transfer baffle at the same time. This occurs because the surface resistivity of the paper is lower at high Rh which provides a path for the transfer field to the grounded baffle.

Floating the pre-transfer baffle is unexceptable because a high voltage builds up on the baffle due to the paper rubbing on the baffle and also the pre-transfer field conducted by the low paper resistivity. This high voltage on the baffle could arc over to grounded metal parts only millimeters away and cause large ground currents which effect the electronic circuits that control the machine.

Volume 8 Number 6 November/December 1983 513

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PRE-TRANSFER BAFFLE ISOLATION NETWORK (Cont'd)

The solution of this problem is to put an isolation network between the pre-transfer baffle and ground. This circuit contains a metal oxide varistor, resistors R and R1 and a capacitor C (see attached drawing).

As paper contacts the baffle and the dicorotron field, the baffle starts to collect a charge. If the voltage on the baffle exceeds the voltage rating of the metal oxide varistor, (MOV), the impedance of the MOV lowers allowing voltages above the MOV's ra...