| 摘要 |
A belt transferring device for transferring on a record paper a toner image formed onto an image forming member is disclosed. The belt transferring device comprises a transferring belt with a dielectric layer formed on a conductive belt member; a driving device for running the transferring belt; a charging unit for charging the surface of the transfer belt to a polarity opposite to the charging polarity of toner; a brush roller having electroconductive fibers studed onto the outer periphery thereof and for cleaning the surface of the transfer belt; a bias supply source connected to the brush roller for biassing the brush roller to a grounded voltage or to a polarity opposite to the charging polarity of toner; a driving device for rotating and driving the brush roller; and a pair of rollers arranged between the charging and the transferring position and for carrying the transfer belt and a recording paper by clamping them, so that a backup roller positioned at a side facing or opposite to the dielectric layer of the transfer belt is connected to a grounded voltage point or a bias voltage point having the same polarity as the toner charging polarity.
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