Browse Prior Art Database

LONG FIELD REFLECTIVE PAPER SKEW SENSOR INSTRUMENT

IP.com Disclosure Number: IPCOM000025312D
Original Publication Date: 1984-Aug-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 91K

Publishing Venue

Xerox Disclosure Journal

Abstract

With reference to the figure, there is shown a sensor to measure the lead and trail edge skew angle of a moving sheet of paper through a reprographic machine. Since, by its nature, laser produces a small, collimated point of bright light, it was chosen as the illumination source for this instrument. A .5mW HeNe laser 1 is connected to a YJ" channel piece of extruded aluminum, hereafter known as the "optic bar" 2. Two mirrors, placed a known distance apart and resting at 45 degree angles are inserted into the optic bar. One mirror is a half silvered, beam-splitter 3, while the second is a 94% front surface unit 4.

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KEROX DISCLOSURE. JOURNAL

LONG FIELD REFLECTIVE PAPER SKEW SENSOR INSTRUMENT Claude E. Moore
Gene R. Trimmer
William J. Appleton

Proposed Classification
U.S. CI. 355/3 Int. CI. C03g 15/00

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With reference to the figure, there is shown a sensor to measure the lead and trail edge skew angle of a moving sheet of paper through a reprographic machine. Since, by its nature, laser produces a small, collimated point of bright light, it was chosen as the illumination source for this instrument. A .5mW HeNe laser 1 is connected to a YJ" channel piece of extruded aluminum, hereafter known as the "optic bar" 2. Two mirrors, placed a known distance apart and resting at 45 degree angles are inserted into the optic bar. One mirror is a half silvered, beam-splitter 3, while the second is a 94% front surface unit 4.

263 Volume 9 Number 4 July/August 1984

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LONG FIELD REFLECTIVE PAPER SKEW SENSOR INSTRUMENT fCont'd)

Two laser beams are directed down to the paper path. After the 633 nM beam reflects from the mirrors, it is passed through a perforated ring of four optical sensors 5 and a narrow-band-pass optical glass filter 6, designed to pass only the color of the laser light. When the light deflects off the moving paper, it passes back through the optical filter, and is received by the four sensors.

The major advantage of this system over others that have apoeared, is the very long operating "depth of field". Most sensor systems must be located ohysicallv close to the moving paper, or the paper must be capture...