Abstract: A refiner for the manufacture of cellulose pulp where the raw material is processed in a gap between two opposed refining members rotary relative one another, and where at least one of the refining members is supported on a rotary refiner shaft (2) driven by a motor (4). An intermediate shaft (3) is connected non-rotary to a first and, respectively, second coupling (6 and, respectively, 7) between the rotor shaft (5) of the motor (4) and the refiner shaft (2) for transferring the drive moment. For damping the torsion oscillations in the mechanically connected shafts (2, 3, 5), an outer pipe (8) stiff against torsion is provided concentrically with the intermediate shaft (3), and one end of the pipe (8) is rigidly connected to the first coupling (6) at one end of the intermediate shaft, and the other end of the pipe (8) is connected by means of a friction damper (9) to the second coupling (7) at the other end of the intermediate shaft.

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.