Browse Prior Art Database

FEEDER AND BOTTOM STACKER

IP.com Disclosure Number: IPCOM000025652D
Original Publication Date: 1987-Feb-28
Included in the Prior Art Database: 2004-Apr-04
Document File: 4 page(s) / 165K

Publishing Venue

Xerox Disclosure Journal

Abstract

In many environments, particularly xerographic reproduction machines, it may be desirable to provide a sheet feeder wherein the sheets are removed from the bottom of a stack. Bottom feeders are particularly useful for feeding blank sheets of copy paper into a copy machine and enable continual replenishment of the stack without stopping operation of the machine as is necessary with top sheet feed devices. Further, if the sheet feeding device is to be utilized for feeding documents to the platen of a copy machine for imaging thereat, it may be desirable to feed from the bottom of the stack to maintain the proper pagination so that the output from the copy machine is pre-collated. In certain modes of operation, it may also be desirable to insert a copied document into the bottom of a stack of documents already copied so that the proper page orientation is maintained to enable subsequent copying in the proper order.

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Page 1 of 4

XEROX DISCLOSURE JOURNAL

FEEDER AND BOTTOM STACKER Proposed David Eisler US. C1.21713.1 Classification

Int. C1. B65d 25/14

FLOW

A LIFT fl) PAPER STACK

FIG. 2

BACK STOP

Volume 12 Number 1 January/February 1987 5

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Page 2 of 4

FEEDER AND BOTTOM STACKER (Cont'd)

f/G. 2A

a

AIR INLET

    XEROX DISCLOSURE JOURNAL
Volume 12 Number 1 January/February 1987

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

Page 3 of 4

FEEDER AND BOTTOM STACKER (Cont'd)

In many environments, particularly xerographic reproduction machines, it may be desirable to provide a sheet feeder wherein the sheets are removed from the bottom of a stack. Bottom feeders are particularly useful for feeding blank sheets of copy paper into a copy machine and enable continual replenishment of the stack without stopping operation of the machine as is necessary with top sheet feed devices. Further, if the sheet feeding device is to be utilized for feeding documents to the platen of a copy machine for imaging thereat, it may be desirable to feed from the bottom of the stack to maintain the proper pagination so that the output from the copy machine is pre- collated. In certain modes of operation, it may also be desirable to insert a copied document into the bottom of a stack of documents already copied so that the proper page orientation is maintained to enable subsequent copying in the proper order.

Accordingly, disclosed herein is a feeder-stacker apparatus that is adapted to allow the insertion of sheets seriatim into a tray to form a stack or remove the sheets individually from the bottom of a stack. The feeder-stacker 10 is based on the principle that fluid passing around a curve generates forces on the surrounding structure as depicted in Figure 1 whereas shown, force components are generated within a channel in both the X and Y directions on the top and bottom surfaces of a channel as fluid presses therethrough. As a result, small air requirements and light forces are used by the apparatus of Figure 2 to levitate, feed and/or bottom stack paper or sheets of any kind. The general configuration of the stacker-feeder 10 in Figure 2 is similar to a vacuum corrugation feeder (VCF) as disclosed, for example, in U. S. Patent No. 4,305,576, but the principle of levitation and some structure im rovements are new. Whereas the previously mentioned VCF lifts aper by

based on the principle that fluid passing around a curve generates forces on the surrounding structur...