Browse Prior Art Database

Divergent, Fuser Approach, Upper Paper Guide

IP.com Disclosure Number: IPCOM000101180D
Original Publication Date: 1990-Jul-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 1 page(s) / 42K

Publishing Venue

IBM

Related People

Huber, DL: AUTHOR [+2]

Abstract

This invention is effective in eliminating smear of the printed image on the lower portion of the page on any electrophotographic type of copier or printer that uses a hot roll fuser.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Divergent, Fuser Approach, Upper Paper Guide

       This invention is effective in eliminating smear of the
printed image on the lower portion of the page on any
electrophotographic type of copier or printer that uses a hot roll
fuser.

      Due to stresses set up in the paper as it moves through the
fuser 1, the trailing edge of the document is subject to distortions
that can cause it to raise up as much as 2-3 inches, which, in turn,
can cause the unfused toner to smear on the lower portion of the page
when it comes in contact with the upper guide 2.  In existing
products, the technique used to eliminate this problem is to provide
a large amount of overhead clearance in the approach path to the
fuser which consumes volume in the machine.  It has been found that a
divergent upper guide 2, as shallow as 10 degrees, is effective in
totally eliminating smear.  As shown in the drawing, only the bottom
edge of the document 3, which is a no print zone, touches the upper
guide.  This allows the overhead clearance starting at the OPC drum 4
to be a few millimeters instead of a few inches.  This invention is
valuable as a space saver which, in turn, can reduce the overall size
of the machine.