Electrostatic image transfer device having a two level transfer

Details Electrostatic image transfer device having a two level transfer Electrostatic image transfer device having a two level transfer

1996-04-23

1998-01-27

Moses, R. L.

Electrophotography

Control of electrophotography process

Control of transfer

399316, G03G 1516

Patent

active

057130639

ABSTRACT:
An image-transfer device for transferring an image from an image-bearing member to a sheet-like material by an electrostatic force, having a charging member for charging the sheet-like material so that the image on the image-bearing member is transferred onto the sheet-like material. A transporting mechanism is also provided for transporting the sheet-like material through a transfer region between the charging member and the image-bearing member, the transporting mechanism including a guide member for guiding the sheet-like material, the guide member having a first edge portion arranged at an upstream side of the transfer region and a second edge portion arranged at a downstream side of the transfer region so as to form an opening at the transfer region. A first voltage source applies a first transfer voltage and a second transfer voltage to the charging member wherein the second transfer voltage is a lower voltage than the first transfer voltage. A first switch sets the first transfer voltage as the output of the first voltage source when the sheet-like material is guided by both of the first edge portion and the second edge portion, and sets the second transfer voltage as the output of the first voltage source when either the first guide portion or the second guide portion does not guide the sheet-like material.

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