By applying the FKR-rollers, the magnetic field of the SIS sensor is amplified and respectively concentrated. Thereby the sensor signal is amplified whereas the noise signal is only marginally influenced. This leads to a considerable improvement of the signal to noise ratio (SNR).
The rolling device is positioned by an electric motor over the cord belt material with a distance to the material which is equivalent to the thickness of the cord belt material. During operation the rollers are stationary.
If a step slice or an undulated splice touches the rollers, each roller is rotatable and individually spring-mounted so that no clamping of the material will occur.