Abstract: A method and apparatus for operating a textile machine, such as an automatic bobbin winder or an automatic spinning machine, include subdividing a course of operation into individual operating steps; monitoring at least one of the operating steps with at least one sensor for detecting presence, absence or movement past the sensor of an article connected to the textile machine or success or failure of a provision or an operating step and tripping an automatic intervention into the course of operation as a function of the outcome of the detection. According to the method, the functional capability of the sensor is automatically monitored, and an automatic switch over takes place from the operating program to a prepared substitute program no longer requiring the sensor for continued operation of the textile machine after failure of the sensor.

Abstract: Method of fastening drive elements on a hollow shaft, which comprises:pushing n drive elements with a thickness a over a hollow shaft, retaining the drive elements at mutual spacings b and in respective desired azimuthal positions by means of holding devices;providing active sections of a material with a given limit of elasticity, a length c, mutual spacings d and being bounded by sealing lips on a hydraulic expanding device so that n(a+b)=n(c+d), pushing the hydraulic expanding device into the hollow shaft; andapplying a pressure through the hollow shaft to the active sections stressing the material of the active sections radially beyond the given limit of elasticity.