Yarn guide eyelet and monitoring mechanism in a textile yarn processing machine

In a textile yarn processing machine, such as a two-for-one twister and the like, having spindle assembly stations for the processing of yarn and each including means forming a rotating balloon of running yarn during such processing and spindle control mechanisms, such as start and stop devices;

• the combination therewith of a yarn guide eyelet and monitoring mechanism at each of said spindle assembly stations for operating said spindle control mechanisms in response to the absence and presence of yarn running through said yarn guide eyelet and monitoring mechanism, said yarn guide eyelet and monitoring mechanism comprising:
• a yarn guide eyelet positioned in said spindle assembly station for limiting the upper end of the rotating balloon of yarn during passage of the running yarn therethrough which causes forces on said eyelet in the running direction of the yarn;
• a generally flat, leaf spring rigidly mounted on one side to said machine and having incisions extending inwardly from the one side for forming a predetermined bending zone in said leaf spring at the zone of the inward ends of said incisions, said leaf spring movably supporting and carrying said eyelet on the other side thereof and biasing said eyelet into a predetermined position in the absence of yarn running through said eyelet and allowing angular non-swivelable movement of said eyelet in the running direction of the yarn out of the predetermined position by bending of said spring in said bending zone under the influence of the forces acting on said eyelet and the presence of yarn running through said eyelet;
• and
• electrical switch means operatively connected with said spindle control mechanisms and being positioned adjacent said leaf spring for being engaged and disengaged when said eyelet is in the predetermined position occurring in the absence of yarn running through said eyelet and when said eyelet is moved out of the predetermined position under the influence of the forces acting on said eyelet in the presence of yarn running through said eyelet for accomplishing switching functions for operating said spindle control mechanism.