Electrophotography – Image formation – Transfer
Patent
1995-11-22
1997-03-25
Grimley, Arthur T.
Electrophotography
Image formation
Transfer
399296, G03G 1516
Patent
active
056149980
ABSTRACT:
In an image forming apparatus, an exposing device electrostatically forms a latent image on an image carrier while a developing device develops the latent image with toner to thereby form a corresponding toner image. An image transferring device transfers the toner image to a sheet in contact with the image carrier. A pretransfer lamp discharges the image carrier before the transfer of the toner image to the sheet. A bias applying device applies a bias voltage at the time of the image transfer. A cleaning device removes the toner remaining on the image carrier after the image transfer. A toner conveying device conveys the toner removed by the cleaning device to the developing device. The bias applying device applies the bias voltage only when the sheet exists between the image carrier and the transferring device. The apparatus prevents toner particles charged to the polarity opposite to the expected polarity during an interval between consecutive sheets from being returned to the developing device via the cleaning device, and in addition allows such toner particles to be effectively reused.
REFERENCES:
patent: 5132738 (1992-07-01), Nakamura et al.
patent: 5386274 (1995-01-01), Sanpe et al.
patent: 5455664 (1995-10-01), Ito et al.
Chen Sophia S.
Grimley Arthur T.
Ricoh & Company, Ltd.
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