Scanning gauge control for sheet processing apparatus
US4000402A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 10, 1974 |
| Grant date | Dec 28, 1976 |
| Priority date | — |
| Expiry date | Jun 10, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B15/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for controlling the machine direction variations of a property or properties of a sheet material being processed. A scanning gauge moved back and forth across the sheet material as it is moved in the machine direction, takes measurements of the property being controlled at fixed intervals across the sheet and a true profile is computed from the measurements made. At the end of each scan of the gauge the average of all the true profile points is computed. A control variable affecting the sheet property is manipulated so as to maintain the machine direction property of the sheet at some target value as a function of the array of values comprising the true profile, the gauge readings of the sheet property and the true profile average.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.