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SHEET ON PLATEN SENSOR FOR DETERMINING MODE PRIORITIES

IP.com Disclosure Number: IPCOM000025752D
Original Publication Date: 1987-Oct-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 101K

Publishing Venue

Xerox Disclosure Journal

Abstract

A system to sense the presence of a document sheet on the platen (forgotten during a manual document copying operation), to prevent automatic document feed until the document is removed. A light reflection optical sensor located in the document handler platen cover over the platen is preferred. The sensor indicates that a document sheet is on the platen. This signal is used for several purposes, e.g., to detect a sheet manually placed or left on the platen by the operator, and then to prioritize a manual copying mode in a multimode document handling system even if RDH or SADH copying modes have been selected. It prevents damaging a delicate document.

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XEROX DISCLOSURE JOURNAL

SHEET ON PLATEN SENSOR FOR Proposed Classification DETERMINING MODE PRIORITIES U.S. C1.355/14SH
T. Acquaviva Int. C1. G03g 15/00
W. Schaeffer

A system to sense the presence of a document sheet on the platen (forgotten during a manual document copying operation), to prevent automatic document feed until the document is removed. A light reflection optical sensor located in the document handler platen cover over the platen is preferred. The sensor indicates that a document sheet is on the platen. This signal is used for several purposes, e.g., to detect a sheet manually placed or left on the platen by the operator, and then to prioritize a manual copying mode in a multimode document handling system even if RDH or SADH copying modes have been selected. It prevents damaging a delicate document.

More specifically, in an automatic document handling system for a copier with a mechanical document sheet platen transport and plural document sheet inputs for (a) manual copying of the document without a mechanical document transport (b) recirculating document handling to and from the platen from a recirculating document handler tray, and (c) a semiautomatic document input particularly suitable for oversized documents or computer formed web documents; with automatic prioritizing of these inputs for controlling from which input documents are fed, and for controlling the operation of the platen transport drive; the improvement wherein an on- platen document sensor is positioned to sense the presence or absence of a document on a platen, from a position on the platen which is within the desired document exposure area for any of said documents from any of said document...