Apparatus for measuring the degree of entanglement in a yarn

Abstract

Between a feed roll feeding an entangled multifilament yarn to a measuring zone of degree of entanglement and a yarn-forwarding roll forwarding the yarn out of the measuring zone are disposed a first tension roll with a weight attached thereto, a pulley connected to a rotation meter and supported free to rotate, and a second tension roll with a weight attached thereto. A needle capable of piercing the yarn is provided between the pulley and either one of the first and the second tension rolls. Under the state wherein the needle pierces the yarn, an auxiliary weight is added to the first or the second tension roll, and the movement distance of the yarn from the position where the needle pierces the yarn to the position where the point of entanglement is engaged with the needle is measured by detecting the amount of rotation of the pulley. Next, the auxiliary weight is removed, an auxiliary weight is added to the other tension roll, and the movement distance of the yarn from the above position to the position where another point of entanglement is engaged with the needle is measured similarly. The measured movement distance of the yarn corresponds to the distance between the points of entanglement and gives a measure of the entanglement. By the measuring apparatus, the degree of entanglement in a yarn can be measured automatically with high accuracy without using a tension meter.