Tension detector for an advancing yarn layer

Claim 1

A tension detector for an advancing layer of straightened yarns, comprising a frame; and means mounted on said frame for guiding the layer along a V-path, said means comprising: two counter-bracing rollers mounted on said frame for rotation about parallel axes in a common plane, a rotatable feeler member, and a support member for mounting the feeler member in a frame with the longitudinal axis of the feeler member parallel to the axes of said counter-bracing rollers and situated between the latter, said support member including strain gauges, and means for moving said feeler member in the frame between first and second positions with respect to the common plane of the axes of said counter-bracing rollers, said first position being a fitting position which allows the passage of a plane of yarn between the rotating feeler member and the said counter-bracing rollers and said second position being the measuring position wherein the feeler member is located at a position between the bracing rollers at which a plane of yarn can no longer be inserted between the feeler member and the counter-bracing rollers; said support member including a cross-member and a plurality of parallel arms secured at one end on said cross-member, each arm having a side notch formed therein, and said feeler member comprising a plurality of coaxial rollers each of which is mounted in the notch of a corresponding arm, and each arm extending into a beveled free end.