Browse Prior Art Database

DOCUMENT HANDLER JAM DETECTION

IP.com Disclosure Number: IPCOM000024710D
Original Publication Date: 1981-Oct-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 72K

Publishing Venue

Xerox Disclosure Journal

Abstract

The document handler jam detector uses two transmissive optical sensors to detect document position. They detect proper document registration at the input station and are used for jam detection. Three jam checks are performed as a document is cycled onto the platen. A document handling system (DHS) jam occurs if (1) the document takes too much time clearing the input station; (2) the document overshoots the platen registration edge; or (3) the document is pulled out of the input station prior to the feed on cycle.

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XEROX DISCLOSURE JOURNAL

DOCUMENT HANDLER JAM DETECTION Proposed Lawrence P. Lavery Classification

U.S. Cl. 355/14
Int. C1. G03g 15/00

The document handler jam detector uses two transmissive optical sensors to detect document position. They detect proper document registration at the input station and are used for jam detection.

Three jam checks are performed as a document is cycled onto the platen. A document handling system (DHS) jam occurs if (1) the document takes too much time clearing the input station; (2) the document overshoots the platen registration edge; or (3) the document is pulled out of the input station prior to the feed on cycle.

A document handler jam also occurs if the document takes too much time being ejected off the platen. The DHS cycle is halted and the "Clear Document Handler" message is illuminated if any of the above jam checks are met.

The DHS has two operating modes, chain feed and non-chain feed. Chain feed operation is enabled when another original is properly registered at the input station at least .5 seconds prior to ejecting the document on the platen. When this is accomplished, the documents will be changed without any drop in throughput. During non-chain feed operation, the scanned document would have been cycled off the platen prior to commencing the feed on cycle of the next original.

A unique jam response has been incorporated into the machine software for a "registration edge overshoot" jam in the chain feed mode. This is...