Method and a stretching device for the holding of a weft thread

Abstract

A method for holding an inserted weft thread in an air jet weaving machine is presented which is provided with a reed ( 8 ). In this method the weft thread is inserted into the air jet weaving machine, is deflected by means of a nozzle ( 3 ) out of the weft insertion direction ( 9 ) and is blown into a receiving opening ( 5 a ) of the catching channel ( 5 ) and held in the same. The position of the nozzle ( 3 ) and of the catching channel ( 5 ) is for this purpose matched to the desired cloth width within the width of the reed. In the named method the nozzle ( 3 ) and the catching channel passage ( 5 ) are arranged at the beat up side of the reed ( 8 ).

1 . A method for holding an inserted weft thread in an air jet weaving machine provided with a reed ( 8 ) in which method
 the weft thread is inserted into the air jet weaving machine,   the weft thread is deflected by means of a nozzle ( 3 ) having a nozzle opening out of the weft insertion direction ( 9 ) and into a receiving opening ( 5   a ) of a catching channel ( 5 ),   the weft thread is held in the catching channel ( 5 ) and   the position of the nozzle ( 3 ) and of the catching channel ( 5 ) is matched within the width of the reed ( 8 ) to the desired cloth width,   
     characterized in that
 the nozzle opening of the nozzle ( 3 ) and the catching channel ( 5 ) are arranged at the beat up side of the reed ( 8 ). 
 
   
   
       2 . A method in accordance with  claim 1 , wherein the weft thread is deflected by means of the nozzle ( 3 ) in a direction transverse to the weft insertion direction ( 9 ). 
   
   
       3 . A method in accordance with,  claim 1 , wherein the nozzle ( 3 ) includes a nozzle tube ( 3   a ) which is arranged at least partly between two reed teeth of the reed ( 8 ), in particular in the region of a lower reed nose ( 8   c ). 
   
   
       4 . A method in accordance with,  claim 1 , wherein a weft thread introduced into the catching channel ( 5 ) is blown by means of a second nozzle ( 4 ) out of the receiving opening ( 5   a ) of the catching channel ( 5 ). 
   
   
       5 . A method in accordance with,  claim 1 , wherein the weft thread is returned by means of the catching channel ( 5 ) into a weft channel ( 8   b ) provided in the reed ( 8 ). 
   
   
       6 . A stretching device for holding an inserted weft thread in an air jet weaving machine provided with a reed ( 8 ), which stretching device ( 1 ) includes a catching channel ( 5 ) and a nozzle ( 3 ) having a nozzle opening, the blowing direction of which differs from a weft insertion direction ( 9 ) in order to deflect an end portion of the weft thread by means of the nozzle ( 3 ) out of the weft insertion direction ( 9 ) and into a receiving opening ( 5   a ) of the catching channel ( 5 ) and at least one fastening part ( 2   a ,  2   b ,  2   c ) in order to secure the catching channel ( 5 ) and the nozzle ( 3 ) and to displaceably arrange the stretching device ( 1 ) within the width of the reed ( 8 ), characterized in that the catching channel ( 5 ) and the nozzle opening of the nozzle ( 3 ) can be installed by means of the at least one fastening part ( 2   a ,  2   b ,  2   c ) at the beat up side of the reed ( 8 ). 
   
   
       7 . A stretching device in accordance with  claim 6 , wherein the blowing direction of the nozzle ( 3 ) is aligned transverse to the weft insertion direction ( 9 ). 
   
   
       8 . A stretching device in accordance with,  claim 6 , wherein the nozzle ( 3 ) includes a nozzle tube ( 3   a ) which has an oval or flat cross-section at least in one region ( 3 ′ a ) in order to arrange the nozzle tube ( 3   a ) between two reed teeth of the reed ( 8 ), in particular in the region of a lower reed nose ( 8   c ). 
   
   
       9 . A stretching device in accordance with,  claim 6 , including a second nozzle ( 4 ) in order to blow a weft thread inserted into the catching channel ( 5 ) out of the receiving opening ( 5   a ) of the catching channel. 
   
   
       10 . A stretching device in accordance with,  claim 6 , wherein the second nozzle ( 4 ) is arranged at the catching channel ( 5 ) and/or at a fastener part ( 2   a ,  2   b ) of the same. 
   
   
       11 . A stretching device in accordance with,  claim 6 , wherein the catching channel ( 5 ) includes at least one bend in order to return the weft thread to a weft channel ( 8   c ) provided in the reed ( 8 ).