Method and apparatus for sensing the thickness of a fiber layer on a moving surface
US4041770A · kind A · utility
5Cited by
4References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 29, 1975 |
| Grant date | Aug 16, 1977 |
| Priority date | — |
| Expiry date | Oct 29, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B13/06
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A pneumatic measuring means is placed over the main cylinder to measure pressure variations due to changes in fiber layer thickness. The measured pressures are transmitted to a measuring and control means which compares the measured pressures to a pre-set value and produces a difference signal which is then used to control the card. The difference signal can be imposed on the supply means for the card, the doffing means or the drafting means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.