Apparatus for thickness sorting of sheet materials
US4331241A · kind A · utility
Inventors
Key dates
| Filing date | Sep 26, 1979 |
| Grant date | May 25, 1982 |
| Priority date | — |
| Expiry date | Sep 26, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B15/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A roller conveyer transports sheet material to accumulating hoppers provided with rotatable distributing chutes. Chute drivers are electrically connected to a unit for measuring the material thickness via a control unit. The thickness measuring unit comprises a radioisotope thickness gauge including a radiation detector and a radioactive source, positioned on opposite sides of the sheet material between two pairs of drive rollers of the conveyer. A meter measures the average value of the radiation intensity during a period of time within which a single sample of the material being sorted passes through the radiation zone. Another meter measures the instantaneous value of the radiation intensity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.