from the center of the refining disk and segments at different distances from the center are also preferably provided with measuring devices it is also advantageous for the measuring devices to be staggered peripherally in relation to each other all with the object of being better able to determine the force distribution in the refiner and thus for better control of the refining process when a measuring device is affected by a force parallel with the surface of the refining disk segment the force sensor of the measuring device will generate a signal that is proportional to the load the measuring device according to the present invention functions in accordance with the principle illustrated in fig2 a disk segment 1 can be seen here from the side equipped with bars 3 a measuring device 5 is also visible comprising a part of the surface of the disk segment and being provided with a number of bars 6 or at least parts thereof when the refining disk is subjected to a shear load f the measuring device 5 the sensor will take up a load f m which is denoted by the following expression where l 2 is the distance between the point where a sensor 10 in the measuring device is secured and the joint 8 of the device and where l 1 is the distance between the measuring surface 7 of the measuring device and the joint 8 this formula is valid provided the joint does not take up any torque and that the pressure distribution over the measuring surface 7 subjected to the shear force is not too uneven.