Developing device for electrophotographic image forming apparatu

Details Developing device for electrophotographic image forming apparatu Developing device for electrophotographic image forming apparatu

1996-07-31

1998-02-10

Grimley, Arthur T.

Electrophotography

Internal machine environment

Particle or contaminant control

399 45, 399 66, 399297, 399391, G03G 1516

Patent

active

057179816

ABSTRACT:
In an electrophotographic image forming apparatus having a toner image forming device, an image transfer device includes an image transfer roller for transferring the toner image to a sheet in an image transferring operation. At least two sheet feeding devices feed and convey a sheet to the image transfer device, at least one of the feeding devices having a sheet width sensor. A power supply applies a bias to the image transfer device and a control device controls the application of the bias so as to remove toner on said image transfer roller between image transferring operations. The control device applies the bias for a predetermined time, or with a predetermined voltage, when it has received a signal indicative of a width of the sheet conveyed to the image transfer device and applies the bias for a longer time, or with a higher voltage, when it has not received a signal indicative of a width of the sheet conveyed to the image transfer device.

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