Roller transfer apparatus having an extended nip exhibiting low pressure
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United States of America Patent
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-
Jan 3, 1989
Issued Date -
N/A
app pub date -
Apr 20, 1987
filing date -
Mar 23, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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