Auto-leveler
US4100791A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 2, 1977 |
| Grant date | Jul 18, 1978 |
| Priority date | — |
| Expiry date | May 2, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B13/08
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for producing an electrical output signal which varies as a function of sliver thickness with a trumpet having a bore through which the sliver passes and a port opening into the bore, and a sensor with a housing defining an inner space sealingly divided by a flexible diaphragm into an upper compartment and a lower averaging compartment. The lower compartment is connected to the trumpet port and to a pressure source via a metering valve having an air escape port. A shaft is fixed for movement vertically with the diaphragm and has a weight on the end within the lower compartment and a magnetic portion in the upper compartment. Vertical movement of the diaphragm caused by a change in back pressure caused in turn by a change in sliver thickness produces an electrical signal in a coil wound about the shaft in the upper compartment as the coil interacts with the magnetic portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.