Roller transfer apparatus having an extended nip exhibiting low

Details Roller transfer apparatus having an extended nip exhibiting low Roller transfer apparatus having an extended nip exhibiting low

1987-04-20

1989-01-03

Prescott, A. C.

Photocopying

Including fiber optics

355 3R, 355 3BE, 355 14TR, G03G 1516

Patent

active

047960477

ABSTRACT:
Roller transfer apparatus of simplified construction which has an extended transfer nip exhibiting low pressure for effecting efficient transfer of marking particle images from a dielectric support with a substantial reduction in image transfer defects. In such transfer apparatus, the dielectric support in the form of a web is supported by a mechanisnm offset relative to the transfer roller in an upstream and/or downstream direction to position the web relative to the transfer roller to establish an extended contact nip zone with a low nip pressure. As an example, the support mechanism includes a pair of spaced rollers respectively offset relative to the transfer roller in an upstream and downstream direction to provide a nip zone with a dimension of at least 0.01 m measured in the direction of roller rotation and a nip pressure in such zone of less than 2.times.10.sup.4 Pa.

REFERENCES:
patent: 3781105 (1973-12-01), Meagher
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patent: 4435067 (1984-03-01), Draai et al.
patent: 4537494 (1985-08-01), Lubinsky et al.
patent: 4566781 (1986-01-01), Kuehnle
patent: 4607935 (1986-08-01), Kindt et al.
patent: 4641956 (1987-02-01), Seanor

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