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A STACK HEIGHT LIMITER

IP.com Disclosure Number: IPCOM000025936D
Original Publication Date: 1989-Feb-28
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 97K

Publishing Venue

Xerox Disclosure Journal

Abstract

One of the more common devices for feeding individual sheets from a stack of sheets such as may be used in an automatic printing machine is a friction retard feeder wherein a stack of sheets is urged upwardly and a continuously or intermittent rotating feed roll is pivoted down into contact with the top sheet in the stack adjacent a retard member so that the top sheet is fed from the stack. One of the difficulties associated with such a sheet feed system is in limiting the position in the vertical direction of the top sheet in the stack of sheets relative to the retard member and the rotating feed roll when it is in the feeding position. If the top sheet is not positioned within a fairly narrow range, it will result in a multisheet feed or a long shingled sheet feed which will subsequently result in a multisheet feed during the next feeding cycle. Figures 1 and 2 illustrate a device which will at the same time permit the stack of sheets to be urged upwardly but not hinder feeding. A bar or roller will function as a stack height limiter 18 to limit the height to which a paper stack can rise against a feeding mechanism so as to revent the multifeeds.

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Proposed Classification

U.S. C1.355/35H
Int. C1. G03b 27/72

1

10 16 e7

FIG. I

18

I

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10

FIG. 2

Volume 14 Number 1 January/February 1989

35

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Page 2 of 2

A STACK HEIGHT LIMITER (Cont'd)

One of the more common devices for feeding individual sheets from a stack of sheets such as may be used in an automatic printing machine is a friction retard feeder wherein a stack of sheets is urged upwardly and a continuously or intermittent rotating feed roll is pivoted down into contact with the top sheet in the stack adjacent a retard member so that the top sheet is fed from the stack. One of the difficulties associated with such a sheet feed system is in limiting the position in the vertical direction of the top sheet in the stack of sheets relative to the retard member and the rotating feed roll when it is in the feeding position. If the top sheet is not positioned within a fairly narrow range, it will result in a multisheet feed or a long shingled sheet feed which will subsequently result in a multisheet feed during the next feeding cycle. Figures 1 and 2 illustrate a device which will at the same time permit the stack of sheets to be urged upwardly but not hinder feeding. A bar or roller will function as a stack height limiter 18 to limit the height to which a paper stack can rise against a feeding mechanism so as to revent the multifeeds.

the stack of sheets down from the limiter...