Browse Prior Art Database

PAPER JAM DETECTION IN SHINGLED SHEET STREAM

IP.com Disclosure Number: IPCOM000027072D
Original Publication Date: 1995-Feb-28
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 83K

Publishing Venue

Xerox Disclosure Journal

Abstract

The present disclosure is directed toward paper jam detection in a device employing a shingled sheet stream of paper, for example, the Xerox 4135 Laser Printer and associated output modules. Conventional paper path jam detection approaches employ electronic switches and/or sensors to detect lead and trailing edges of sheets passing through a single-sheet path. More specifically, such systems track the sheet edges to determine delays indicative of paper jams. However, in shingled sheet paper paths, where sheets are intended to partially overlay one another as they are transported, no such edge detection can be accomplished.

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XEROX DISCLOSURE JOURNAL

PAPER JAM DETECTION IN SHINGLED SHEET STREAM Barbara A. Sampath
Mark A. Omelchenko

Proposed Classification

US. C1.355/316 Int. C1. G03g 21/00

The present disclosure is directed toward paper jam detection in a device employing a shingled sheet stream of paper, for example, the Xerox 4135 Laser Printer and associated output modules. Conventional paper path jam detection approaches employ electronic switches and/or sensors to detect lead and trailing edges of sheets passing through a single-sheet path. More specifically, such systems track the sheet edges to determine delays indicative of paper jams. However, in shingled sheet paper paths, where sheets are intended to partially overlay one another as they are transported, no such edge detection can be accomplished.

Accordingly, the present disclosure is directed to a method and apparatus for detecting the presence of a paper jam in a shingled sheet paper path. Proposed is the use of an optical sensor placed at or slightly above the nominal height of shingled sheets passing through the paper path. The sensor would employ a transmitter spaced apart from a receiver by a distance sufficient to cover all or at least a portion of the shingled sheet paper path. More specifically, the light beam passing between the transmitter and receiver would be generally parallel to the process direction, and the transmitter would preferably be positioned at or near a centerline of the paper path. Any time that...