Browse Prior Art Database

VARIABLE PRESSURE POINT FEEDER

IP.com Disclosure Number: IPCOM000023104D
Original Publication Date: 1976-Aug-31
Included in the Prior Art Database: 2004-Mar-27
Document File: 2 page(s) / 324K

Publishing Venue

Xerox Disclosure Journal

Abstract

When feeding copy sheets having a toner image on one side for making a duplex copy, a feed roll mark is created on the second side if the copies are fed with the imaged side down. This mark is caused by the pressure of the feeding device at the contact point and the slipping of the top sheet off the stack, Since the pressure point is station- ary, a dark mark is created at the pressure point by con- stantly rubbing off some of the toner from the bottom face of the copy sheet being fed onto the top of the hext adjacent copy sheet in the stack.

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Page 1 of 2

XEROX DISCLOSURE JOURNAL

VARIABLE PRESSURE

POINT FEEDER Thomas N. Taylor

Wayne F. Schoppe

Proposed Classification
U.S. Cl. 271/18 mt. Cl. 365h 3/00

PIG. I

8

6

3

9

PIG. 2

Volume 1 Number 8 August 1976 45

[This page contains 1 picture or other non-text object]

Page 2 of 2

~RIABLE PRESSURE POINT FEEDER (Cont~d)

When feeding copy sheets having a toner image on one side
for making a duplex copy, a feed roll mark is created on
the second side if the copies are fed with the imaged side
down. This mark is caused by the pressure of the feeding
device at the contact point and the slipping of the top
sheet off the stack, Since the pressure point is station-
ary, a dark mark is created at the pressure point by con- stantly rubbing off some of the toner from the bottom face
of the copy sheet being fed onto the top of the hext adjacent copy sheet in the stack.

One solution to this problem is to create a variable
pressure point for the feeder, This results in a light
inconspicuous mark rather than a dark concentrated mark as
formed conventionally. The pressure point can be moved
sideways as in Figure 1 by using a feed member 1 having a
helical friction surface 2 for advancing the sheet 3, In
the separator shown in Figure 1, the feed roll 1 extends
out from a belt 4 which coacts with a retard member 5 to
provide friction retard separation.

Alternatively, the pressure point can be moved forwards or
backwards of the stack as in the embodiment of Figure 2.
The feed belt 6 is arranged about a plurali...