CHECKING MECHANISM FOR DETECTING YARN BREAKAGES IN OPEN END SPINNING MACHINES

Yarn breakage-detecting mechanism for open end spinning machines, such as those in which a spinning chamber is used which operates under pressure. On the outer end of the withdrawing tube of the chamber there is a sidewardly extending extension piece having a groove on its upper surface communicating with the mouth of the tube. A yarn tension checking and fibrous material feeding controlling lever is mounted on a pivot at one side of the tube, the lever having a plate attached to its upper end. The parts are so arranged that when the yarn is unbroken and extends from the mouth of the tube to yarn-withdrawing rolls, the yarn engages the outer edge of the plate to maintain the lever in its fibrous material feeding position. When the yarn breaks, the lever tips to stop the feeding of fibrous material, the plate then covering the groove on the extension. To repair the breakage, a yarn is introduced into the groove and thence into the withdrawing tube. When the end of the yarn is inside the spinning chamber, the yarn is automatically placed under tension, thereby to hold the lever in its fibrous material feeding position.