Browse Prior Art Database

DOCUMENT/PAPER SENSOR

IP.com Disclosure Number: IPCOM000025681D
Original Publication Date: 1987-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 143K

Publishing Venue

Xerox Disclosure Journal

Abstract

Documents or paper must be sensed as they are transported from one location to another within, for example, xerographic copying machines. It is important that the size of the documentlpaper andlor its position be identified, including whether or not it is skewed. Generally, this has been accomplished by the use of conductive fiber brushes in linear arrays which generate signals to adjust various machine parameters that are dependent on the document/paper size and location. In the case of a skew signal, the documentlpaper path may be corrected or alternatively the documentlpaper may be rejected as unsuitable for further transportation or processing. While these brushes have been shown to be functional, they have not attained a practical lifetime under copying machine conditions.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 55% of the total text.

Page 1 of 2

XEROX DISCLOSURE JOURNAL

DOCUMENT/PAPER SENSOR

Heiko Rommelman Joseph J. Wysocki Ian D. Morrison Richard A. Hudson

Proposed Classification

us. c1.355/3 Int. C1. G03g 15/00

Documents or paper must be sensed as they are transported from one location to another within, for example, xerographic copying machines. It is important that the size of the documentlpaper andlor its position be identified, including whether or not it is skewed. Generally, this has been accomplished by the use of conductive fiber brushes in linear arrays which generate signals to adjust various machine parameters that are dependent on the document/paper size and location. In the case of a skew signal, the documentlpaper path may be corrected or alternatively the documentlpaper may be rejected as unsuitable for further transportation or processing. While these brushes have been shown to be functional, they have not attained a practical lifetime under copying machine conditions.

By fabricating a film coated with a conductive coating and subsequently formed into a cylinder, by use of a cylindrical conductive thick film or a cylindrical conductive fiber brush, or by use of a multiplicity of linear conductive fiber brushes disposed about a cylindrical mandrel and then placing them in contact with a conducting plane or grid in order to complete the electrical circuit, each design will provide increased effective life because it can be incrementally rotated as required by wear considerations by, for example, a roller assembly.

In one embodiment, conductive films such as conductive particles in an insulating host binder may be coated onto flexible substrates such as Kapton, Mylar, thin metal sheets or metal coated Kapton, via spin, roller or spray coating techniques. Layered sheets formed in this way may be bonded end- to- end to form cylindrical shapes which may be placed over roller assemblies with diameters substantially less than that of the cylinder. In the case of a fiber brush, the fibers are in themselves sufficiently flexible and the fiber brush may be bonded directly to the roller. The purpose of the roller assembly is to provide means for incrementally advancing the fildbrush after a specified period of use.

The bottom portion of the layered film or brush is to be in contact with a conducting plane or grid over which the paper is fed. This conducting lane/grid is employed to complete the electrical circuit between the hrn/brush and the sensing circuitry.

As the document or paper passes between the film/brush and the conducting planelgrid, electrical contact is broken in the region of the papeddocument

Volume 12 Number...