Electrostatographic printing machine

Details Electrostatographic printing machine Electrostatographic printing machine

1997-09-09

2000-11-07

Moses, Richard

Electrophotography

Document handling

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399397, 399306, G03G 1500, G03G 2100

Patent

active

061448362

ABSTRACT:
A transport roll 1 consists of a metal roll 3 of 40 mm in diameter covered with a conductive PFA tube 2 of 10.sup.10 .OMEGA.cm in volume resistivity and 200 .mu.m in thickness. A DC voltage source 4 is connected to the metal roll. A sheet of paper 5 bearing toner images 6 and 7 on both sides thereof receives a drive force from a paper drive roll, and turns with the movement of the paper. The DC voltage source produces voltage VB1 of the same polarity as the charging polarity (positive) of the toner image 6 being in contact with the transport roll. The voltage VB1 is optimumly controlled so as to prevent the transport roll from being soiled with toner.

REFERENCES:
patent: 5264902 (1993-11-01), Suwa et al.
patent: 5287153 (1994-02-01), Senba
patent: 5331385 (1994-07-01), Ohtsuka et al.
patent: 5623719 (1997-04-01), De Cock et al.
patent: 5723214 (1998-03-01), Yamazaki et al.
patent: 5725922 (1998-03-01), Nakamura et al.

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