Browse Prior Art Database

IMPROVED METHOD FOR PAPER BASIS WEIGHT DETECTION

IP.com Disclosure Number: IPCOM000026940D
Original Publication Date: 1994-Aug-31
Included in the Prior Art Database: 2004-Apr-07
Document File: 4 page(s) / 212K

Publishing Venue

Xerox Disclosure Journal

Abstract

A method for processing output voltage from an optical basis weight detection sensor for a weight detection system. The method includes the steps of calculating an average voltage of all the output signals from the sensor for a given measured paper, calculating a standard deviation of these signals, and comparing the average to a predetermined range for light, average and heavy paper. If the average voltage is at a boundary between ranges for light, average and heavy paper, the standard deviation is used, and if the standard deviation is small, the heavier paper will be registered.

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Page 1 of 4

XEROX DISCLOSURE JOURNAL

IMPROVED METHOD FOR PAPER BASIS WEIGHT DETECTION U.S. C1.250/559 Robert P. Siege1
Stephen C. O'Leyar

Proposed Classification

Int. C1. GOln 21/86

0.401

0.30

0.20

AVG OF

STD DEV'S

PAPER BASIS WEIGHT STUDY

E

4

k

8

0.0 50.0 100.0 150.0 200.0

GSM

FIG. I

XEROX DISCLOSURE JOURNAL - Vol. 19, No. 4 July/August 1994 265

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IMPROVED METHOD FOR PAPER BASIS WEIGHT DETECTION(Cont'd)

80

60

40

20

IMPROVED ALGORITHM

ORIGINAL ALGORITHM

 LOW MEDIUM HIGH <65gsm > 1 OOgsm

% CORRECT

loo

r

- - -

-

0-

FIG. 2

266 XEROX DISCLOSURE JOURNAL - Vol. 19, No. 4 July/August 1994

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Page 3 of 4

IMPROVED METHOD FOR PAPER BASIS WEIGHT DETECTION( Cont'd)

% CORRECT

100

80

60

40

20

0

IMPROVED ALGORITHM

ORIGINAL ALGORITHM

LOW MEDIUM HIGH

< 65gsm > 1 OOgsm

FIG. 3

XEROX DISCLOSURE JOURNAL - Vol. 19, No. 4 July/August 1994 267

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

Page 4 of 4

IMPROVED METHOD FOR PAPER BASIS WEIGHT DETECTION(Cont'd)

A method for processing output voltage from an optical basis weight detection sensor for a weight detection system. The method includes the steps of calculating an average voltage of all the output signals from the sensor for a given measured paper, calculating a standard deviation of these signals, and comparing the average to a predetermined range for light, average and heavy paper. If the average voltage is at a boundary between ranges for light, average and heavy paper, the standard deviation is used, and if the standard deviation is small, the heavier paper will be registered.

U.S. Patent No. 5,138,178 discloses a non-contactive, transmittive energy sensor used to determine the thickness of paper sheets in a feed path. The average of several measurements of the sheet are used to det...