Abstract: The present invention relates to a method and a device for the detection of a substrate edge in a printing machine comprising a substrate transport unit that defines a substrate transport path (8). In this method, at least one light value of a first section of a sensor line (10) and a dark value of a second section of the sensor line are determined, and a threshold value is calculated based thereon. When the threshold value on one pixel is exceeded and the threshold value on another pixel is not reached, it is possible to calculate a position of the substrate edge. The device comprises a light source arrangement (5) for generating diffuse light, and comprises a sensor line for the detection of light from the light source arrangement.

Abstract: The present invention relates to a method and a device for the detection of a substrate edge in a printing machine comprising a substrate transport unit that defines a substrate transport path (8). In this method, at least one light value of a first section of a sensor line (10) and a dark value of a second section of the sensor line are determined, and a threshold value is calculated based thereon. When the threshold value on one pixel is exceeded and the threshold value on another pixel is not reached, it is possible to calculate a position of the substrate edge. The device comprises a light source arrangement (5) for generating diffuse light, and comprises a sensor line for the detection of light from the light source arrangement.

Abstract: A device for producing and controlling an alternating current with a direct current source in at least one inductive load, in particular for driving a stepper motor, preferably in microsteps. A device for producing and controlling an alternative current with a direct current source in at least one inductive load, in particular for driving a stepper motor, preferably in micro-steps. Such device includes a control loop circuit having an actuator for the control loop containing a complex programmable logic device (CPLD), which is for connecting the control boy to feedback elements. This provides for a flexible adjustment of the current producing and controlling device to the load to be operated, and to the function of the load, without changing the control loop circuit in which the CPLD is implemented. The actuator can be parameterized by use of a (universal) logic description by parameter constants.