Spinning device and method of making yarn

Abstract

A spinning device is provided in which at least one sliver is opened to single fibers and the single fibers are deposited on a moveable collecting surface in the form of a spread out fiber veil. During transport on the collecting surface, the fiber veil is condensed transversely to its direction of movement to a fiber strand. The now roving-like fiber strand is transported through a nipping line and twisted to a thread by a twisting nozzle. On the side facing away from the fiber veil, a suction opening is arranged at the perforated collecting surface, one side edge of said suction opening extending in the direction of movement of the collecting surface while the other side edge is arranged hereto at an acute angle.

1 . Spinning arrangement comprising: 
 an opening roller for opening at least one sliver to single fibers,    a driven, air-permeable collecting surface arranged directly adjacent to the opening roller and in the direction of motion of the single fibers for taking over the single fibers in the form of a wide fiber veil,    a suction opening for condensing the fiber veil to a narrow fiber strand, said suction opening being covered by the collecting surface and tapering by two side edges in the direction of motion of the collecting surface, from a starting width corresponding to the width of the fiber veil to a narrow suction slit,    a nipping line, provided at the end area of the suction opening for nipping the condensed fiber strand, and    a twisting nozzle arranged downstream of the nipping line for twisting the fiber strand to a thread,    wherein one side edge of the suction opening extends in the direction of motion of the collecting surface and the other side edge is arranged at an acute angle (α) to the direction of motion of the collecting surface.    
     
     
         2 . A spinning arrangement according to  claim 1 , wherein the collecting surface is provided outside of the area of the suction opening with a reinforcement against deformation along the side edge extending in the direction of motion of said collecting surface.  
     
     
         3 . A spinning arrangement according to  claim 1 , wherein the suction opening is provided in the area of its starting width with side edges parallel to one another, directly downstream thereof with side edges enclosing an acute angle (α) and in the area of the nipping line with parallel side edges which form the narrow suction slit.  
     
     
         4 . A spinning arrangement according to  claim 2 , wherein the suction opening is provided in the area of its starting width with side edges parallel to one another, directly downstream thereof with side edges enclosing an acute angle (α) and in the area of the nipping line with parallel side edges which form the narrow suction slit.  
     
     
         5 . A spinning arrangement according to  claim 1 , wherein the suction opening is successively connected to various levels of pressure in a plurality of suction chambers.  
     
     
         6 . A spinning arrangement according to  claim 2 , wherein the suction opening is successively connected to various levels of pressure in a plurality of suction chambers.  
     
     
         7 . A spinning arrangement according to  claim 3 , wherein the suction opening is successively connected to various levels of pressure in a plurality of suction chambers.  
     
     
         8 . A spinning arrangement according to  claim 4 , wherein the suction opening is successively connected to various levels of pressure in a plurality of suction chambers.  
     
     
         9 . A spinning arrangement according to  claim 1 , wherein a cover, adapted to the course of the side edges of the suction opening is arranged adjacent the collecting surface, said cover covering the fiber veil and the fiber strand but not coming into contact therewith.  
     
     
         10 . A spinning arrangement according to  claim 2 , wherein a cover, adapted to the course of the side edges of the suction opening is arranged adjacent the collecting surface, said cover covering the fiber veil and the fiber strand but not coming into contact therewith.  
     
     
         11 . A spinning arrangement according to  claim 3 , wherein a cover, adapted to the course of the side edges of the suction opening is arranged adjacent the collecting surface, said cover covering the fiber veil and the fiber strand but not coming into contact therewith.  
     
     
         12 . A spinning arrangement according to  claim 4 , wherein a cover, adapted to the course of the side edges of the suction opening is arranged adjacent the collecting surface, said cover covering the fiber veil and the fiber strand but not coming into contact therewith.  
     
     
         13 . A spinning arrangement according to  claim 5 , wherein a cover, adapted to the course of the side edges of the suction opening is arranged adjacent the collecting surface, said cover covering the fiber veil and the fiber strand but not coming into contact therewith.  
     
     
         14 . A spinning arrangement according to  claim 1 , wherein the acute angle (α) of the side edge not extending in the direction of motion of the collecting surface becomes increasingly larger in a travel direction of said fiber vail.  
     
     
         15 . A spinning arrangement according to  claim 2 , wherein the acute angle (α) of the side edge not extending in the direction of motion of the collecting surface becomes increasingly larger in a travel direction of said fiber vail.  
     
     
         16 . A spinning arrangement according to  claim 3 , wherein the acute angle (α) of the side edge not extending in the direction of motion of the collecting surface becomes increasingly larger in a travel direction of said fiber vail.  
     
     
         17 . A spinning arrangement according to  claim 4 , wherein the acute angle (α) of the side edge not extending in the direction of motion of the collecting surface becomes increasingly larger in a travel direction of said fiber vail.  
     
     
         18 . A spinning arrangement according to  claim 5 , wherein the acute angle (α) of the side edge not extending in the direction of motion of the collecting surface becomes increasingly larger in a travel direction of said fiber vail.  
     
     
         19 . A spinning arrangement according to  claim 9 , wherein the acute angle (α) of the side edge not extending in the direction of motion of the collecting surface becomes increasingly larger in a travel direction of said fiber vail.  
     
     
         20 . A spinning arrangement according to  claim 1 , wherein a separate nipping roller pair is provided for the nipping line.  
     
     
         21 . A spinning arrangement according to  claim 2 , wherein a separate nipping roller pair is provided for the nipping line.  
     
     
         22 . A spinning arrangement according to  claim 3 , wherein a separate nipping roller pair is provided for the nipping line.  
     
     
         23 . A spinning arrangement according to  claim 4 , wherein a separate nipping roller pair is provided for the nipping line.  
     
     
         24 . A spinning arrangement according to  claim 5 , wherein a separate nipping roller pair is provided for the nipping line.  
     
     
         25 . A spinning arrangement according to  claim 9 , wherein a separate nipping roller pair is provided for the nipping line.  
     
     
         26 . A spinning arrangement according to  claim 14 , wherein a separate nipping roller pair is provided for the nipping line.  
     
     
         27 . A method of making yarn utilizing a spinning arrangement comprising: 
 an opening roller for opening at least one sliver to single fibers,    a driven, air-permeable collecting surface arranged directly adjacent to the opening roller and in the direction of motion of the single fibers for taking over the single fibers in the form of a wide fiber veil,    a suction opening for condensing the fiber veil to a narrow fiber strand, said suction opening being covered by the collecting surface and tapering by two side edges in the direction of motion of the collecting surface, from a starting width corresponding to the width of the fiber veil to a narrow suction slit,    a nipping line, provided at the end area of the suction opening for nipping the condensed fiber strand, and    a twisting nozzle arranged downstream of the nipping line for twisting the fiber strand to a thread,    said method comprising: 
 controlling said fiber vail during travel over said collecting surface with one side edge of said vail extending in a direction of travel of said vail on said collecting surface and an opposite side edge of said vail extending at an acute angle to the direction of travel of said vail on said collecting surface, whereby condensing of said fiber vail during travel over the collecting surface is in one direction of torsion, and  
 applying a spinning twist to said fiber vail downstream of the collecting surface.  
   
     
     
         28 . A method according to  claim 27 , wherein said controlling said fiber vail during travel over said collecting surface includes configuring the suction opening to have one side edge extending in the direction of motion of the collecting surface and the other opposite side edge extending at an acute angle to the direction of motion of the collecting surface.