Browse Prior Art Database

METHOD OF SENSING PAPER IN A XEROGRAPHIC FUSING ASSEMBLY

IP.com Disclosure Number: IPCOM000026479D
Original Publication Date: 1992-Apr-30
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 81K

Publishing Venue

Xerox Disclosure Journal

Abstract

In a xerographic copying system, where toner must be fused to the surface of a copy sheet, it is important to reliably detect the presence of copy sheets within the fusing region. This requirement results from the potential for fire that exists when a copy sheet fails to exit the fuser. In general, this requirement has been met by interrogation of copy sheet sensors positioned at the entrance and exit of the fusing assembly, or possibly by a single sensor located within the fusing assembly. In either case, the reliability of the sensors positioned in the high heat environment has been of great concern. The concern is primarily due to the fact that the switches or optoelectronic devices used in the the sensors are generally less reliable when subjected to the high temperatures of the fuser.

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XEROX DISCLOSURE JOURNAL

METHOD OF SENSING PAPER IN A XEROGRAPHIC FUSING ASSEMBLY U.S. C1.355/316 Stanley J. Wallace
John E. Courtney
Wilbur M. Peck

Proposed Classification

Int. C1. G03g 21/00

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XEROX DISCLOSURE JOURNAL - Vol. 17, No. 2 MarcWAprill992 101

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

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METHOD OF SENSING PAPER IN A XEROGRAPHIC FUSING ASSEMBLY(C0nt'd)

In a xerographic copying system, where toner must be fused to the surface of a copy sheet, it is important to reliably detect the presence of copy sheets within the fusing region. This requirement results from the potential for fire that exists when a copy sheet fails to exit the fuser. In general, this requirement has been met by interrogation of copy sheet sensors positioned at the entrance and exit of the fusing assembly, or possibly by a single sensor located within the fusing assembly. In either case, the reliability of the sensors positioned in the high heat environment has been of great concern. The concern is primarily due to the fact that the switches or optoelectronic devices used in the the sensors are generally less reliable when subjected to the high temperatures of the fuser.

Accordingly, the present invention is directed at a method for increasing the distance between the fuser and the heat sensitive optoelectronic sensors, thereby reducing the nominal operating temperature of the sensor and improving reliability. The figure illustrates that this is...