Method and device for producing a yarn with ring-spun characteristics

Abstract

In what is referred to as an air vortex spinning method, fibres are dispersed by a dispersion roller ( 5 ) into individual fibres, and conveyed by means of a suction roller ( 9 ) against a fibre conveying channel ( 15 ), from which the fibres are conducted against the mouth of a yarn channel of a hollow spindle ( 13 ). In this situation, the front ends of the fibres are taken up in the yarn channel ( 14 ), while the rear ends are acquired by a rotating air flow R and rotated around the mouth area of the spindle or yarn channel, so that a yarn is formed which exhibits at least a surface which displays a character similar to a ring-spun yarn. Th principle according to the invention is that, on the one hand, the fibres are separated at the transfer from the dispersion roller ( 5 ) to the suction roller by an abrupt change of direction at the baffles or deflector plates 8 and 17 from the trash particles, these particles being unable to follow the abrupt change of direction because of inertia, in such a way that these trash particles, which cause spinning interruptions in the area between the outlet of the fibre conveying channel ( 15 ) and the intake of the yarn channel ( 14 ), are separated out in good time before the inlet into the fibre conveying channel.

1 . A spinning method for the manufacture of a yarn with the character of a ring-spun yarn, in which: 
 at least one fibre structure is dispersed essentially into individual fibres by dispersion means,    the individual fibres are deposited on a moving collection and conveying surface, and conveyed in a specified direction,    in addition to the direction of conveying, the individual fibres are compacted in a direction transverse to the direction of conveying to form a fibre sliver of specified width, are taken up by the air flow of a fibre conveying channel and conveyed towards a hollow rotating or stationary spindle which takes up the front ends of the individual fibres, whereby 
 fibre ends are splayed out from the fibre sliver by means of the air flow, and are rotated by the air flow after the fibre conveying channel around the fibres taken up by the hollow spindle to form the said yarn,  
 characterised in that  
   the collection and conveying surface exhibits a predetermined lower conveying speed than the conveying speed of the dispersion means, 
 that at the transfer to the collection surface and/or into the fibre conveying channel the individual fibres are defected from the previously conveying direction and are taken up by the collection and conveying surface or by the fibre conveying channel in such a way that th fibres are thereby stretched out and are conveyed onwards in the stretched out state, whereby the stretching out takes place due to the kinetic energy inherent in the fibre and to a certain degree due to the higher speed of the conveying air flow in the fibre conveying channel.  
   
     
     
         2 . The method according to  claim 1 , characterised in that, at the deflection of the fibres, foreign bodies or dirt particles with greater specific weight or lower friction resistance in relation to the air are separated from the fibres and branched off.  
     
     
         3 . The method according to  claim 1 , characterised in that first the front ends of the individual fibres are taken up by the collection and conveying surface and, further, the remainder of the individual fibres are laid by what is referred to as a ride-over onto the collection and conveying surface and so extended and stretched.  
     
     
         4 . The method according to  claim 3 , characterised in that the dispersion roller and the collection and conveying surface exhibit the same or mutually-opposed directions of conveying.  
     
     
         5 . The method according to  claim 1 , characterised in that the suction air flow for the compaction of the fibre sliver is sucked in a suction surface which tapers in the direction of conveying, whereby the narrowest part of the suction surface corresponds essentially to the width of the fibre conveying channel.  
     
     
         6 . The method according to  claim 5 , characterised in that an air flow taking effect at the periphery of the tapering suction surface and directed inwards supports the compaction of the fibre sliver.  
     
     
         7 . The method according to  claim 6 , characterised in that this relates to a suction air flow or a blow air flow.  
     
     
         8 . The method according to  claim 7 , characterised in that the suction or blow air flow is deflected by a guide element.  
     
     
         9 . A device for the production of a yarn with the character of a ring-spun yarn: 
 with dispersion means with a predetermined conveying speed for the dispersion of at least one fibre structure into individual fibres,    with a collection and conveying surface for taking over and taking up and conveying of the individual fibres, towards    a fibre conveying channel in which the fibres are conveyed by means of a conveying air flow towards    a rotating or stationary hollow spindle, through which the yarn is drawn, whereby 
 at the outlet end of the fibre conveying channel twist nozzles are provided, which, on the one hand, after the fibre conveying channel, create a rotating air flow and, on the other hand, create the conveying air flow before and in the fibre conveying channel, by means of which rear ends of individual fibres are splayed and rotated around the mouth periphery of the hollow spindle and therefore around the front fibre ends located therein, in order to be twisted into said yarn,  
 characterised in that  
   on the one hand, the conveying speed of the collection and conveying surface is lower by a predetermined amount than the conveying speed of the dispersion means, and the conveying speed of the dispersion means is greater by a predetermined amount than the conveying speed of the collection and conveying surface, and, on the other hand, transfer means are provided at the transfer from the dispersion means to the collection and conveying surface and/or at the transfer from the collection and conveying surface to the fibre conveying channel, which make possible an essentially abrupt change of direction of the fibres.    
     
     
         10 . The device according to  claim 9 , characterised in that provision is made for the said means and the said conveying speeds to be combined, in such a way that, at takeover by the collection and conveying surface and/or by the fibre conveying channel, the fibres assume a stretched position on the said surface or in the said conveying channel respectively.  
     
     
         11 . The device according to  claim 9 , characterised in that the dispersion means and/or the collection and conveying surface exhibit a camber with a specified radius at least at the fibre transfer point, and that the said transfer means is a baffle or deflector plate with a transfer edge, and the baffle or deflector plate is arranged essentially tangentially to the said camber, and the transfer edge is arranged at a specified distance interval from the collection surface and the inlet of the fibre conveying channel respectively, in such a way that the fibres are deflected around the transfer edge.  
     
     
         12 . The device according to  claim 9 , characterised in that the direction of movement of the collection and conveying surface and the direction of movement of the dispersion means are directed opposite to each other, and the distance interval between the two is such that, after the front end of the fibre has been taken up by the collection and conveying surface, the individual fibre has sufficient space to lie in a stretched position on the collection and conveying surface by means of a ride-over.  
     
     
         13 . The device according to  claim 9 , characterised in that the fibre conveying channel is directed essentially radially or at right angles to the collection and conveying surface.  
     
     
         14 . The method according to  claim 1 , characterised in that the dirt particles are separated out at the deflection point by means of the deflection of the fibres.  
     
     
         15 . The method according to  claim 1 , characterised in that the said speeds are matched in such a way that essentially not more fibres are delivered to the spindle than are drawn off through the finished yarn.  
     
     
         16 . The spinning method for the production of a yarn, in which at least one fibre structure is dispersed into individual fibres by a dispersion means, and the individual fibres are taken over by a moving collection and conveying means, and conveyed in a predetermined direction,  
       characterised in that 
 the fibres undergo stretching out in the area of the collection and conveying means.  
 
     
     
         17 . The method according to  claim 16 , characterised in that the extension stretching is effected by a ride-over of the fibres.  
     
     
         18 . The method according to  claim 16 , characterised in that during the deflection of the fibres dirt is simultaneously separated out.  
     
     
         19 . The spinning method for the production of a yarn, in which at least one fibre structure is dispersed into individual fibres by a dispersion means, and the individual fibres are taken over by a moving collection and conveying means, and conveyed in a predetermined direction into a spinning device,  
       characterised in that 
 the fibres undergo a lashing motion after the dispersion and before reaching the spinning device.  
 
     
     
         20 . The method according to  claim 19 , characterised in that the lashing motion is effected in such a way that the fibres thereby undergo stretching out.  
     
     
         21 . The method according to  claim 19 , characterised in that during the lashing motion of the fibres dirt is simultaneously separated out.  
     
     
         22 . The method according to  claim 17  or  19 , characterised in that the lashing motion is effected by means of a deflection of the fibres during the takeover by the collection and conveying means.  
     
     
         23 . The method according to  claim 22 , characterised in that the deflection is effected in such a way that the conveying direction after the dispersion means is essentially opposed to the conveying direction of the collection and conveying means.  
     
     
         24 . The method according to  claim 22 , characterised in that the deflection is effected in such a way that the conveying speed of the collection and conveying means is less than the conveying speed after the dispersion means.  
     
     
         25 . The method according to  claim 23 , characterised in that the deflection is effected in such a way that the conveying speed of the collection and conveying means is greater than the conveying speed after the dispersion means.  
     
     
         26 . The spinning method for the production of a yarn, in which at least one fibre structure is dispersed into individual fibres by a dispersion means, and the individual fibres are taken over by a moving collection and conveying means, and conveyed in a specified direction into a spinning device,  
       characterised in that 
 after the delivery of the fibres from the dispersion means, and before reaching the spinning device, a dirt separation process takes place.  
 
     
     
         27 . The method according to  claim 26 , characterised in that the dirt separation takes place at a deflection point of the fibres, at which the fibres undergo an abrupt change of direction and the dirt is thereby removed.  
     
     
         28 . The method according to  claim 21 , characterised in that the collection and conveying means comprise a suction roller.  
     
     
         29 . The method according to  claim 26  or  27 , characterised in that the dirt separation is effected by means of a filter effect, for example at the suction roller according to  claim 22 .  
     
     
         30 . The device for the production of a yarn according to at least one of the foregoing method claims, with: 
 a dispersion means for the dispersion of a fibre structure into individual fibres and    for the further conveying of these fibres to a collection and conveying means for taking up the fibres and conveying them onwards, and    a spinning device for taking up the fibres after the collection and conveying means and for the production of the yarn,    characterised in that    means are provided in the area of the collection and conveying means for the stretching out of the fibres.    
     
     
         31 . The device according to  claim 30 , characterised in that the means for the stretching out of the fibres are fibre deflection means, by means of which the front end of the fibre is deflected against the collection and conveying means.  
     
     
         32 . The device according to  claim 31 , characterised in that the deflection means are designed in such a way that, after the front end of the fibre has been deflected, the rear end of the fibres is guided along the deflection means and beyond them, and in this situation carries out a lashing motion.  
     
     
         33 . The device according to  claim 31 , characterised in that the deflection means are designed in such a way that dirt which is conducted along it is conducted past the collection and conveying means.  
     
     
         34 . The device according to  claim 30 , characterised in that the collection and conveying means are a suction roller ( 9 ,  65 ) and the deflection means are the suction air from this roller.  
     
     
         35 . The device according to  claim 34 , characterised in that the conveying speed of the suction roller is provided as lower than the conveying speed after the dispersion means.  
     
     
         36 . The device according to  claim 34 , characterised in that the conveying speed of the suction roller is provided as greater than the conveying speed after the dispersion means.  
     
     
         37 . The device according to  claim 34 , characterised in that the collection and conveying means convey the fibres after the takeover against the spinning device.  
     
     
         38 . The device according to  claim 34 , characterised in that the suction roller comprises suction holes, which are designed in respect of size and arrangement in such a way that fine dirt can be sucked through these holes and can be conveyed away by aspiration.  
     
     
         39 . The device according to  claim 34 , characterised in that the suction roller is designed in such a way that the fibres conducted on it are compacted in a direction transverse to the conveying direction to form a narrower fibre sliver.  
     
     
         40 . The device according to  claim 30 , characterised in that the collection and conveying means exhibit a lower conveying speed than the conveying speed of the dispersion means.  
     
     
         41 . The device according to  claim 30 , characterised in that the spinning device is an air vortex spinning device.  
     
     
         42 . The device according to  claim 30 , characterised in that the spinning device is a respooling spinning device.  
     
     
         43 . The device according to  claim 30 , characterised in that the spinning device is a centrifugal spinning device.  
     
     
         44 . The device according to  claim 30 , characterised in that the dispersion means exhibit a direction of conveying which is directed essentially opposite to the collection and conveying means.  
     
     
         45 . The spinning method for the production of a yarn with the character of a ring-spun yarn, in which: 
 at least one fibre structure is dispersed essentially into individual fibres,    the individual fibres are deposited on a moving collection and conveying means and conveyed in a specified direction,    in addition to the conveying direction, the individual fibres are also compacted in a direction transverse to the conveying direction to form a fibre sliver of specified width, and taken up by an air flow of a fibre conveying channel and conveyed against a hollow spindle, rotating or stationary, which takes up the front ends of the individual fibres, whereby: 
 fibre ends are splayed out of the fibre sliver by means of the air flow, and are rotated by the air flow after the fibre conveying channel in order to twist the fibres taken up by the hollow spindle to form the said yarn,  
 characterised in that  
   the collection and conveying surface exhibits a specifically lower conveying speed than the conveying speed of the dispersion means, 
 that the individual fibres are deflected, at the transfer to the collection surface and/or into the fibre conveying channel, out of the previous conveying direction and taken up by the collection and conveying means or by the fibre conveying channel in such a way that the fibres are stretched out in this situation due to the kinetic energy inherent in the fibres, as a result of the higher speed of the conveying air flow in the fibre conveying channel, and/or that first the front ends of the individual fibres are taken up by the collection and conveying surface, and, further, the remainder of the individual fibres are deposited on the collection and conveying surface by means of what is referred to as a lashing motion, and therefore stretched out.  
   
     
     
         46 . The device for the production of a yarn with the character of a ring-spun yarn, 
 with a first dispersion means with specified conveying speed, for the dispersion of at least one fibre structure into individual fibres,    with a collection and conveying surface for the take up and conveying of the individual fibres against    a fibre conveying channel, in which the fibres are conveyed by means of a conveying air flow against a rotating or hollow spindle, through which the yarn is drawn, whereby 
 an outlet end of the fibre conveying channel is provided with twist nozzles, which on the one hand create a rotating air flow after the fibre delivery channel, and, on the other, creates the conveying air flow before and in the fibre conveying channel, by means of which rear ends of individual fibres are splayed and rotated around the mouth periphery of the hollow spindle and therefore around the front fibre ends located therein to form the said yarn,  
 characterised in that  
   on the one hand, the conveying speed of the collection and conveying surface is specifically smaller than the conveying speed of the dispersion means, and that the conveying speed of the air flow in the fibre conveying channel is specifically higher than the conveying speed of the collection and conveying surface, and, on the other, hand, 
 guide means are provided at the transfer from the dispersion means to the collection and conveying surface and/or at the transfer from the collection and conveying surface to the fibre conveying channel, which allows for an essentially abrupt change of direction of the fibres.  
   
     
     
         47 . The device according to  claim 46 , characterised in that the dispersion means and/or the collection and conveying surface exhibit a camber arrangement with a specified radius at least at the fibre transfer point, and that the said guidance means are a baffle or deflector plate with a transfer edge, and the baffle or deflector plate is provided essentially tangential to the said camber, and the transfer edge is provided for in such a way, with a distance interval to the collection surface or to the intake of the fibre conveying channel respectively, that the fibres are deflected around the transfer edge.  
     
     
         48 . The method according to  claim 45 , characterised in that by means of deflection of the fibres the dirt particles are separated out by centrifugal force at the transfer point.  
     
     
         49 . The method according to  claim 45 , characterised in that the said speeds are determined in such a way that the fibre flow, i.e. the fibre quantity per time unit, at the spindle corresponds to the fibre quantity in the yarn.