Tension Control System of Filament Yarn in Preparing Process for Weavingby Hysteresis Tenser

In the process of preparing warp yarn by using a sectional warper, washer tensers, in which a pair of disks compensate the friction forces of running yarn, have been used to maintain filament yarn tension in a constant level. By this method, however, it is difficult to compensate abrupt changes of yarn tension. In this report, we have designed the tension control system by method of fuzzy theory which is composed of a tension sensor, a tenser device and a personal computer. The tenser device was prototyped by the use of a direct current motor, a pulley with pieces of permanent magnet, and a cogwheel. This control system was evaluated as a tension controlled experiment for a sectional warper. As the results of experiments, it is possible for this system to control filament yarn tension within deviation ±2cN to set the tension value 20cN under 200m/min in yarn speed. And we confirmed that this tension control system is excellent in transition characteristics and stability in tension control for a sectional warper comparing with two types of traditional tension devices.