Image forming apparatus with a voltage applying unit for image t

Details Image forming apparatus with a voltage applying unit for image t Image forming apparatus with a voltage applying unit for image t

1998-08-17

2000-12-12

Braun, Fred L.

Electrophotography

Control of electrophotography process

Of plural processes

399 66, 399313, G03G 1514

Patent

active

061609692

ABSTRACT:
An image forming apparatus transfers a toner image from a photoconductive image carrier to a recording medium with a transfer roller and senses the density of a particular toner pattern formed on the image carrier with an optical sensor. A voltage of a first polarity opposite the polarity of the toner is applied to the transfer roller when the toner image is to be transferred to the recording medium. A voltage of a second polarity identical to the polarity of the toner is applied to the transfer roller when the toner pattern is to be moved between the image carrier and the transfer roller. Thus, even when a toner pattern is brought to the transfer roller, the transfer roller is not released from the photoconductive element.

REFERENCES:
patent: 4619522 (1986-10-01), Imai
patent: 5689771 (1997-11-01), Sato et al.
patent: 5719684 (1998-02-01), Ohkaji et al.
patent: 5822649 (1998-10-01), Karashima et al.
patent: 5828927 (1998-10-01), Yoo et al.
patent: 5845174 (1998-12-01), Yasui et al.
patent: 5857132 (1999-01-01), Mizuishi et al.

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