Apparatus and method for cleaning a transfer device of an image

Electrophotography – Control of electrophotography process – Of plural processes

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399 50, 399 66, 399 37, G03G 1516, G03G 2100

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active

056215096

ABSTRACT:
A contact type image transferring system and method incorporated in an image forming apparatus for cleaning residual toner on a transfer roller. The transfer roller is in contact with a photoconductive drum and forms a nip between the roller and the drum. A sheet of paper passes through the nip and a toner image on the drum is transferred to the sheet of paper at the nip. When the sheet of paper is not at the nip, a first transfer voltage is applied to the transfer roller for 3 to 20 seconds after a paper feed jam is corrected. The polarity of the voltage causes the toner on the transfer roller to be removed. Then a second transfer voltage is applied to the transfer roller which has a polarity which is opposite to the polarity of the first transfer voltage. The voltage difference between the transfer roller and photoconductive drum may be formed by applying bias voltages to both the photoconductive drum and the transfer roller.

REFERENCES:
patent: 4183655 (1980-01-01), Umahashi et al.
patent: 5337127 (1994-08-01), Imaue
patent: 5420668 (1995-05-01), Okano

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