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SELF-REGISTERING AUTOMATIC DOCUMENT FEEDER

IP.com Disclosure Number: IPCOM000024712D
Original Publication Date: 1981-Oct-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 74K

Publishing Venue

Xerox Disclosure Journal

Abstract

In a xerographic copier, a semi-automatic document feeder 1 for feeding document originals from a stack 2 of documents to an imaging platen. The document feeder 1 comprises a foam drive roll 3, driven by a flexible shaft 4, coupled to a source of rotational energy (not shown). In operation, the user stacks the series of document originals to be imaged in a position beneath the foam roller 3 and overlapping a retard pad 5 mounted to a document support surface 6. The roller 3 drives the documents in the stack over the retard pad 5 and a slight document shingling effect occurs. The top document separates from the stack and is registered against a registration guide 6 during each feed cycle. At the completion of each feed, the roll 3 comes into contact with the next available sheet and awaits a feed signal which energizes the source of rotational energy, driving the shaft and therefore, the roll 3.

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XEROX DISCLOSURE JOURNAL

Proposed Classification
U.S. Cl. 355/14

Int. CI. G03g 15/00

Volume 6 Number 5 September/October 1981 267

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

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SELF-REGISTERING AUTOMATIC DOCUMENT FEEDER (Cont'd)

In a xerographic copier, a semi-automatic document feeder 1 for feeding document originals from a stack 2 of documents to an imaging platen. The document feeder 1 comprises a foam drive roll 3, driven by a flexible shaft 4, coupled to a source of rotational energy (not shown). In operation, the user stacks the series of document originals to be imaged in a position beneath the foam roller 3 and overlapping a retard pad 5 mounted to a document support surface 6. The roller 3 drives the documents in the stack over the retard pad 5 and a slight document shingling effect occurs. The top document separates from the stack and is registered against a registration guide 6 during each feed cycle. At the completion of each feed, the roll 3 comes into contact with the next available sheet and awaits a feed signal which energizes the source of rotational energy, driving the shaft and therefore, the roll 3.

The retard pad 5 is positioned in proximity to, yet not directly beneath, the foam roller. The coefficient of friction between the pad 5 and the bottom document is greater than the coefficient of friction between two document surfaces. A slight bending of the entire document stack 2 over the retard pad 5 assists in sheet separa...