Browse Prior Art Database

FRICTION RETARD FEEDER WITH A CONCAVE RETARD PAD

IP.com Disclosure Number: IPCOM000026548D
Original Publication Date: 1992-Oct-31
Included in the Prior Art Database: 2004-Apr-06
Document File: 4 page(s) / 289K

Publishing Venue

Xerox Disclosure Journal

Abstract

A problem with most friction retard feeders is that stubbing occurs in the nip between the retard roll and the retard belt. This is especially significant when curled sheets are fed. A solution to this problem is disclosed in Figs. 1 and 2 that include the use of a concave retard pad in cooperation with a feed roll or belt in order to inhibit stubbing of curled sheets.

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Page 1 of 4

XEROX DISCLOSURE JOURNAL

FRICTION RETARD FEEDER WITH A CONCAVE RETARD PAD Gerald M. Garavuso

Proposed Classification
U.S. C1.271/121 Int. C1. B65h 3/52

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FIG. 2

XEROX DISCLOSURE JOURNAL - Vo1.17 No. 5 SeptembedOctober 1992 281

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Page 2 of 4

FRICTION RETARD FEEDER WITH A CONCAVE RETARD PAD (Cont'd)

A problem with most friction retard feeders is that stubbing occurs in the nip between the retard roll and the retard belt. This is especially significant when curled sheets are fed. A solution to this problem is disclosed in Figs. 1 and 2 that include the use of a concave retard pad in cooperation with a feed roll or belt in order to inhibit stubbing of curled sheets.

In the exemplary duplex document handling (DDHS) system 20 disclosed here all modes of operation utilize the same trays and feeders, including platen document transport 22 and its drive (preferably comprising a stepper or servo motor 24 with encoder). Components may also be shared with a recirculating document handling (RDH) mode of operation of this document handler. All documents to be copied by the copier 10 are sequentially fed to the platen 12 by the DDHS 20 where they are driven over platen surface 12a into a desired copying registration position by the platen transport 22 with its drive 24, and then ejected by that belt transport system 22 from the platen 12. For all modes, including recirculating (precollation) document copying, the set of original documents may be initially loaded stacked face-up into the document tray 26. They are sequentially fed out from the bottom of the stack by the sheet separatodfeeder 80 of the present invention in all modes.

Referring particularly to Fig. 1, all document sheets 27 are initially fed downstream from the tray 26 through a simplex path 30 to the acquisition entrance to the belt transport system 22, adjacent the platen 12. The tray 26 overlies the platen, and the path 30 conventionally provides the shortest possible path connection. The simplex path 30 has a single "C" shaped inversion inverting segment 30a. Thus the documents are turned over once before being presented to the platen. As will be described later herein, the initial portion of this simplex path 30, (just downstream of the separator/feeder 80, at the end of tray 28 and upstream of the inverting segment 30a) includes a side edge registration and de-skewing system 34. which may be a known crossed-rolls edge guide system. The separatodfeeder 80 of the present invention comprises a cantilever mounted retard pad 81 that has a concave surface portion 82 adjacent a convex portion of separation roller 85 which separates document sheets 27 from stack 26. A slanted surface portion 83 of pad 81 is positioned adjacent document sheets 27 for shingling purposes. Retard pad 81 is loaded against separation roller 85 by gravity, however, a lightweight spring spring could be attached to the cantilever member 84, if desired. The...