Xerox Corporation

Tektronix, Inc.

Paul J Menzel

Beta Y Ni

Robert Carl Tidrick

An improved apparatus and method for reducing media wrinkling, especially in envelopes, caused by transport through a fusing nip are provided. To compensate for stress build up in the media as it travels through the fusing nip, the media is bent or 'pre-stressed' in a direction opposite to the nip stress prior to the media entering the fusing nip. A media support surface is positioned upstream from the fusing nip to pre-stress the media by providing pre-nip bending to the media. The media is bent in a direction opposite to the curvature of the harder nip roller prior to the media entering the fusing nip. This pre-nip bending of the media substantially offsets the nip-stress imparted on the media by the fusing nip.

Apparatus and method for reducing media wrinkling in an imaging apparatus

An improved apparatus and method for controlling media temperature to prevent image offset and degloss in an electrostatic image forming apparatus are provided. The apparatus and method utilize a plurality of media support surfaces in the pre-nip media path to reduce heat transfer to the media in this region. An insulating channel is provided beneath the media supports to thermally isolate the media supports. One or more insulating plates may also be provided between the rollers of the fusing nip and the media support surfaces to further reduce heat transfer from the fusing members to the media support surfaces and media.

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University Park, PA, United States of America

Paul J Menzel