Method and apparatus for detecting thickness variation in sheet material
US5317898A · kind A · utility
18Cited by
12References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 11, 1992 |
| Grant date | Jun 7, 1994 |
| Priority date | — |
| Expiry date | Dec 11, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2511/51
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The detection of thickness variations in sheet material, more specifically the presence or absence of labels on a moving web, is accomplished by providing two spaced apart nozzles, an entry for pressurized fluid, first and second conduits to connect the entry and the nozzles, and a differential pressure sensing element connected between the conduits so as to detect a mismatch between the fluid pressures in the two conduits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.