False twister yarn threader - has separate pre-twisting disc to advance yarn into false twisting disc triangle

摘要

To thread a yarn through a flase twister, composed of a number of friction discs in a triangle to form a zig-zag path for the yarn, at least one pretwisting disc (1) with a separate drive is outside the disc triangle. This gives the yarn (2) an initial twist and, together with the yarn guide straps (3), advances the yarn (2) into the disc triangle. The pretwisting disc is driven by an electro-motor, or from the friction disc shaft through friction drive discs. Through the coupling between the pretwisting disc and the yarn guide straps, the yarn is initially brought into contact with the pretwisting disc to be twisted before it is caught by the guide straps. The pretwisted yarn is advanced into the friction twisting disc triangle only by the pretwisting disc. ADVANTAGE - The system prevents excessive draw tensions being applied to the yarn which could cause yarn breakages.