Process and device to influence the braking force of a yarn brake which is arranged between a yarn supply system and a yarn storage in a weaving machine

摘要

The invention relates to a method and a device for influencing the force acting on a weft-braking force in shuttleless looms, wherein the weft yarn (4) by means of a thread storage device (11) from a supply reel (2) is withdrawn, and between Garnvorratsspule and yarn store a weft brake (5 ) is arranged with adjustable braking force.; According to the invention, the braking force of the weft brake (5) is controlled and the weft thread only as much slowed down, as required for a constant winding tension on the yarn accumulator (11). To achieve this, the braking force of the weft brake (5) is controlled by a thread tension sensor (10) is arranged after the weft brake (5), which measures the yarn tension of the weft yarn (4), and transmits the measured value to a control device (14), which regulates the braking force in dependence on the measured thread tension. By incorporating a coil overflow sensor (3) is switched to full Garnvorratsspule during winding overflow from empty to an adjustable inlet braking.