Image forming apparatus having image transfer means

Details Image forming apparatus having image transfer means Image forming apparatus having image transfer means

1990-08-28

1991-09-17

Moses, R. L.

Photocopying

Contact printing

Light boxes

355222, 355223, 355296, 355327, G03G 2100

Patent

active

050499343

ABSTRACT:
An image forming apparatus includes an image bearing member movable along an endless path; primary charger for electrically charging the image bearing member for formation of latent image thereon; a developing device for developing the latent image with toner into a toner image; transfer charger for transferring the toner image onto a recording material; a discharger, disposed between the transfer charger and the primary charger and actable directly on the image bearing member not through the recording material after the toner image is transferred from the image bearing member to the recording material, for effecting electric discharge biased to a polarity opposite to a charging polarity of the transfer charger, wherein a degree of the bias to the opposite polarity is larger for a first portion of the image bearing member corresponding to a trailing edge of the recording material than for a second portion which is different from the first portion.

REFERENCES:
patent: 4252433 (1981-02-01), Sullivan
patent: 4378421 (1983-03-01), Larson
patent: 4804999 (1989-02-01), Mueller

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