Apparatus including contact free transfer of signals for measuring the gap between relatively rotating refiner discs

US4673875A · kind A · utility

Assignee

• Sunds Defibrator Aktiebolag · SE

Inventors

• Olof Kjellqvist · Täby, SE
• Bengt Akerblom · Kalmar, SE
• Axel H. Sjobom · Bellevue, US

Key dates

• Filing date: Jul 24, 1985
• Grant date: Jun 16, 1987
• Expiry date: Jul 24, 2005

Classification

• Technology area (CPC G): Physics
• CPC primary: G01B7/14
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Apparatus for measuring the gap between pairs of relatively rotating refiner discs is disclosed, including a transmitter incorporated into the face of a rotating refiner disc for producing a measurement signal in response to changes in reluctance corresponding to changes in the gap, a circuit for supplying the current to the transmitter, including a transformer for contact-free transfer of the current to the transmitter, a stationary receiver for receiving the measurement signal generated by the transmitter, and a signal transmitter for contact-free transfer of the measurement signal to the stationary receiver.