Image transferring device for image forming equipment

Details Image transferring device for image forming equipment Image transferring device for image forming equipment

1995-03-06

1997-08-19

Beatty, Robert

Electrophotography

Control of electrophotography process

Control of transfer

399314, G03G 1516, G03G 1520

Patent

active

056598432

ABSTRACT:
An image transferring device for image forming equipment and capable of insuring desirable image transfer by obviating premature image transfer, print, and the leak of transfer bias. A belt causes a toner image to be transferred from an image carrier to a transfer medium while conveying it. A bias member applies a charge to the belt. A feedback current from the belt flows through a feedback electrode. A constant current control device executes constant current control such that the difference between a current to flow from the bias member to the belt and the feedback current to flow from the belt to the feedback electrode remains constant. The constant current control is based on PWM having a spatial frequency of either lower than 0.5 cycles/mm or higher than 1.5 cycles/mm. In addition, a current sensing resistor is disposed between a first and second node wherein the first node is connected to a power source for applying current to the bias member and the feedback electrode and the second node is connected to the image carrier.

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