Browse Prior Art Database

Web Width Measuring Device

IP.com Disclosure Number: IPCOM000096823D
Original Publication Date: 1963-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Fernekees, JE: AUTHOR [+2]

Abstract

This is a highly accurate device for continuously measuring the width of a web moving at speeds of up to 150 inches per second. The device has a measurement accuracy of better than 500 microinches in a one inch wide web. The operation of the device is based on a changing vacuum due to changes in the width of the passing web.

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Web Width Measuring Device

This is a highly accurate device for continuously measuring the width of a web moving at speeds of up to 150 inches per second. The device has a measurement accuracy of better than 500 microinches in a one inch wide web. The operation of the device is based on a changing vacuum due to changes in the width of the passing web.

The web to be measured is continuously passed into vacuum column 1 having a width only slightly greater than the expected maximum web width. Guide pulleys, not shown, above column 1 feed the web to and from it. Idler pulley 2 within column 1 positions the web while it is within. as the web passes through column 1 and around pulley 2, more or less air is metered to the vacuum depending upon the web width. A vacuum is applied to column exhaust port 3 at the bottom.

Any change in the vacuum within column 1 is transmitted to the diaphragm of differential pressure sensor 4. The physical changes in the diaphragm of sensor 4 are, in turn, sensed by a capacitive transducer probe and converted into a large analog voltage in pressure to analog voltage device 5. The analog voltage is then applied to an indicating device such as strip recorder 6. The recording obtained indicates the width of the web as the web proceeds through column 1. Go or no-go limit signals can indicate boundary conditions of the web.

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