Electrostatic image forming apparatus with transfer controls for

Details Electrostatic image forming apparatus with transfer controls for Electrostatic image forming apparatus with transfer controls for

1997-06-16

1998-08-25

Lee, S.

Electrophotography

Control of electrophotography process

Control of transfer

399309, G03G 1516

Patent

active

057992266

ABSTRACT:
An image forming apparatus includes: a toner image forming device to form a toner image on a first image carrier; a first transfer device to transfer the toner image on the first image carrier onto a second image carrier provided opposite to the first image carrier to carry a transferred toner image, or to transfer the toner image on the first image carrier onto one side of a transfer material; a second transfer device to transfer the toner image carried on the second image carrier onto the other side of the material; a fixing device to fix at least one of the toner image on the one side of the transfer material and the toner image on the other side of the transfer material; and a control device to control the toner image forming device, the first transfer device and the second transfer device. The control device has a first image forming mode in which image formation is conducted only on said one side of the transfer material, a second image forming mode in which image formation is conducted only on said other side of the transfer material, and a third image forming mode in which image formation is conducted on both sides of the transfer material. The control device changes a transfer current or a transfer voltage of at least one of the first transfer device and the second transfer device, in accordance with the first, second or third image forming mode.

REFERENCES:
patent: 3580670 (1971-05-01), Bhagat
patent: 4427285 (1984-01-01), Stange

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