| 摘要 |
Method and device for sensing and counting the successive windings (4) being drawn off a supply drum (5) in a yarn-preparing device, where in said windings (4) are sensed by a detection unit (8) including at least two sensors disposed one after the other, each comprising a light transmitter (10, 12) and a light receiver (11, 13), which are arranged in such a manner with respect to each other that the windings being drawn off pass through the light beam between the transmitter and the receiver of each sensor, wherein a pulse is generated whenever the light beam is interrupted, after which the successive pulses are evaluated as one winding being drawn off, wherein the intensity of the light which the receiver receives from the transmitter is determined for each sensor, and if the light intensity at one of said receivers falls below a specific preset value, the pulses from the sensor in question are no longer taken into account in the evaluation, and the pulses from the other sensor(s) are evaluated as one winding being drawn off. |
