Browse Prior Art Database

SELF-CLEANING OPTICAL SENSOR

IP.com Disclosure Number: IPCOM000025339D
Original Publication Date: 1984-Oct-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 60K

Publishing Venue

Xerox Disclosure Journal

Abstract

Optical sensors are used extensively in electrophotographic printing machines to sense or control the position of the copy sheet. In some situations, contamination from the copy sheet and the toner particles present in the printing machine pose a significant problem. These dirt particles coat the optical sensor preventing them from detecting the light rays transmitted thereto giving a false signal indicating that a copy sheet is present thereat, when, in fact no copy sheet is blocking the light rays. In order to overcome this problem, as shown in the drawing, sensor 10 has a beveled glass surface 12 positioned in the paper path and disposed thereover. Beveled glass 12 is made from a maximum of 23' beveled glass surface positioned in the path of the copy sheet. A ramp 14 guides copy sheet 16 into contact with glass 12. Thus, when the copy sheet 16 passes through chute 18, it rubs against glass surface 12 to constantly clean the surface and prevent contamination from building up thereon. In this manner, sensor 10 remains devoid of contaminants and does not produce an erroneous signal.

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 100% of the total text.

Page 1 of 2

XEROX DISCLOSURE JOURNAL

SELF-CLEANING OPTICAL SENSOR Proposed Leo F. Schwab Classification

U.S. c1. 355/3 Int. C1. G03g 15/00

18

////////

16

I

14 I lo

Optical sensors are used extensively in electrophotographic printing machines to sense or control the position of the copy sheet. In some situations, contamination from the copy sheet and the toner particles present in the printing machine pose a significant problem. These dirt particles coat the optical sensor preventing them from detecting the light rays transmitted thereto giving a false signal indicating that a copy sheet is present thereat, when, in fact no copy sheet is blocking the light rays. In order to overcome this problem, as shown in the drawing, sensor 10 has a beveled glass surface 12 positioned in the paper path and disposed thereover. Beveled glass 12 is made from a maximum of 23' beveled glass surface positioned in the path of the copy sheet. A ramp 14 guides copy sheet 16 into contact with glass 12. Thus, when the copy sheet 16 passes through chute 18, it rubs against glass surface 12 to constantly clean the surface and prevent contamination from building up thereon. In this manner, sensor 10 remains devoid of contaminants and does not produce an erroneous signal.

Volume 9 Number 5 September/October 1984 327

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

Page 2 of 2

328 XEROX DISCLOSURE JOURNAL

Volume 9 Number 5 September/October 1984

[This page contains 1 picture or other non-text obje...