Mechanism for withdrawing and winding yarn in spinning units

Claim 1

In combination with a spinning unit for the manufacture of yarn, said unit having a yarn outlet, mechanism for withdrawing and winding yarn issuing from said outlet, said mechanism comprising in that order a pair or rollers for withdrawing yarn from said outlet, a self-threading stationary yarn guide having a yarn guiding opening therethrough, a yarn tension compensator, and means for winding a bobbin including a yarn traverse having a reciprocable yarn guide and a yarn laying mechanism, the yarn tension compensator being of shallow convex bow shape extending in a direction parallel to the path of reciprocation of the reciprocable yarn guide, the reciprocable yarn guide, the yarn tension compensator, and the stationary yarn guide cooperating automatically to thread a yarn initially passing from the yarn outlet to the reciprocable yarn guide into the self-threading stationary yarn guide, the self-threading stationary yarn guide having a body extending generally in the direction of reciprocation of the reciprocable yarn guide, the body having a convex configuration with an apex at one end thereof, the body having a rear yarn guiding surface, further from the normal path of the yarn travelling from the withdrawing rollers to the opening through the stationary yarn guide, and a forward yarn guiding surface closer to the said normal path of the yarn, the body of the self-threading guide having a yarn-receiving slot extending from the forward yarn guiding surface thereof into the yarn guiding opening therethrough.