Yarn texturing air jet

Claim 1

In a yarn texturing air jet of the type including an elongate housing having a central bore therethrough, a venturi supported in the central bore and in the exit end of said housing, an inwardly tapering conical surface on the inner end of said venturi and terminating in an exit orifice extending through the exit end of said venturi, a yarn guiding needle positioned in the central bore of said housing and having an inner end portion positioned closely adjacent said inwardly tapering conical surface on the inner end of said venturi, said needle having an axial yarn guiding channel extending therethrough for directing multifilament yarn through said needle and toward said venturi, said inwardly tapering conical surface of said venturi defining the exit end of a turbulence chamber, and means for directing pressurized gas into the central bore of said housing and along said inner end portion of said needle whereby the gas passes through said turbulence chamber and outwardly through said exit orifice of said venturi to impart crimps, curls and loops to the filaments as the yarn passes through said turbulence chamber; the combination therewith of means for improving the turbulence and enhancing the crimps, curls and loops imparted to the yarn in said turbulence chamber, said means comprising a conical opening extending from the inner end of said needle and inwardly toward the entrance end and terminating at the yarn guiding channel extending through said needle whereby the entrance end of said turbulence chamber is defined by said conical opening in the inner end of said needle.