APPARATUS FOR MEASURING THE POSITION OF WEFT THREADS IN A MOVING FABRIC WEB

摘要

The deviation of the weft threads in a fabric is ascertained to show the extent and angle of the deviation relative to a line extending at a right angle relative to the edge of a moving fabric web. For this purpose a sensor head or several sensor heads are movable across the web. Separate signals are produced for the left and right half of the web relative to a longitudinal center line of the web. A comparing unit compares the separate signals for forming a control value or signal.