Image transfer and contact fixing device

Details Image transfer and contact fixing device Image transfer and contact fixing device

1988-11-10

1990-03-20

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

G03G 1516

Patent

active

049105582

ABSTRACT:
An image transfer and contact fixing device for a photocopier wherein a photoconductive drum presses against a transfer roller in a first contact zone to transfer a powder image from the photoconductive drum to the transfer roller, and a second contact zone wherein a pressure roller presses the receiving material against the transfer roller to transfer powder image from the transfer roller to the receiving material with a force greater than the force with which the photoconductive drum presses against the transfer roller. In a third contact zone, a cleaning roller presses against the transfer roller and exerts a compensating force on the transfer roller in such manner that the net resulting force experienced by the transfer roller at its axis is substantially zero. Preferably, the contact zones are distributed around the circumference of the transfer roller such that the contact zones are not situated close together and the setting of the magnitude of the contact pressure forces results not only in a regular image transfer being obtained but also in the magnitude of the compensating force not becoming extremely large.

REFERENCES:
patent: 3848204 (1974-11-01), Drangelis et al.
patent: 4645327 (1987-02-01), Kimura et al.

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