Method for detecting a tensile stress of a circumferential belt

A method for detecting a tensile stress of a circumferential belt having a running length, and being deflected by at least one tension roller having a position, the method comprising the steps of:

• adjusting the at least one tension roller for changing the running length of the circumferential belt around an adjustment path, wherein said at least one tension roller has a bearing force and at least one force measuring device has at least one direction of detection, the at least one direction of detection depending on the position of the at least one tension roller, the adjustment path having a plurality of points,
• the force measuring device measuring the bearing force in the at least one direction of detection,
• at least one controller having access to at least one memory,
• the at least one force measuring device having a number of stored sensitivities with reference to the tensile stress,
• determining the sensitivities for each of the plurality of points of the adjustment path respectively,
• storing the values in an array in the at least one memory, the values being at least one of the sensitivities and calculated from the sensitivities, and
• the controller calculating a result for the tensile stress from the position, the bearing force, and the stored values by means of interpolation.