Device for the pneumatic joining of yarns

Abstract

A device for the pneumatic splicing of yarns, especially elastane yarns, has a splicing body ( 25 ) defining a splicing conduit ( 26 ) loadable with compressed air, as well as with pneumatic tubes ( 33, 34 ) for pneumatically preparing the yarn ends ( 31, 32 ) to be spliced, wherein the central axes of the pneumatic tubes intersect the central longitudinal plane of the splicing conduit. The pneumatic tubes ( 33, 34 ) are replaceably fixed in bores ( 46, 47 ) of the splicing body ( 25 ), with the inlet opening ( 48, 49 ) of the pneumatic tubes ( 33, 34 ) positioned in the immediate vicinity of one of the two outlets ( 50, 51 ) of the splicing conduit ( 26 ). The inlet opening ( 48, 49 ) of the pneumatic tube ( 33, 34 ) has a funnel-shaped contour ( 52 ) that promotes insertion of the cut ends of the upper and lower yarns ( 31, 32 ) into the pneumatic tubes ( 33, 34 ).

What is claimed is:  
     
         1 . A device for the pneumatic joining of two yarn ends, comprising a splicing body having a splicing conduit extending between opposite conduit outlets for receiving the yarn ends and being loadable with compressed air for executing a splicing operation, and pneumatic tubes for preparing the yarn ends to be spliced, the pneumatic tubes being replaceably fixed to the splicing body in an orientation wherein the pneumatic tubes have respective central axes which intersect a central longitudinal plane of the splicing conduit and respective inlet openings each disposed in the immediate vicinity of a respective one of the conduit outlets, each inlet opening of the pneumatic tubes being of a funnel shape to promote insertion of the yarn ends into the pneumatic tubes.  
     
     
         2 . The device according to  claim 1 , further comprising a stopping element fixable to the splicing body adjacent each conduit outlet, each stopping element being contoured to define the funnel shape of a respective one of the inlet openings.  
     
     
         3 . The device according to  claim 1 , wherein the central axis of each pneumatic tube intersects the central longitudinal plane of the splicing conduit at a bottom of the splicing conduit.  
     
     
         4 . The device according to  claim 1 , further comprising injection openings in the splicing conduit of the splicing body and tangential bores in the pneumatic tubes are connected to a source of compressed air via pneumatic lines and regulatable valves.  
     
     
         5 . The device according to  claim 4 , wherein the valves are connected via control lines to a winding-head computer for controlling pneumatic fixing of the yarn ends in the pneumatic tubes at least until an initial introduction of compressed air into the splicing conduit of the splicing body.  
     
     
         6 . The device according to  claim 5 , wherein the valves are controllable for timed overlapping of a pulse of compressed air introduced into the pneumatic tubes and a pulse of compressed air introduced into the splicing conduit of the splicing body.