Spinning unit piecing process for producing feed spools

Abstract

In the case of a process for piecing at a spinning unit that is used for producing feed spools consisting of multiple-wound, prestrengthened slivers for a subsequent twisting operation or the like, it is provided that first the supply of the drafting roller device is started, after which the slivers are sucked into the pneumatic false-twisting devices, are guided through them and are then jointly gripped at the outlet of the false-twisting devices, are placed in a withdrawal device and are then fed to a winding-up device.

What is claimed: 
     
       1. A piecing process for piecing prestrengthened slivers formed in a unit of the type having drafting roller means for supplying a pair of drafted slivers, pneumatic false twisting means for forming prestrengthened slivers from the pair of drafted slivers, prestrengthened sliver withdrawing means for withdrawing the prestrengthened slivers from the false twisting means and joint sliver wind-up means for jointly winding up the pair of prestrengthened slivers to form feed spools of multiple wound prestrengthened slivers which can be used in subsequent twisting operations or the like to form commercially usable yarn, said process comprising the sequential steps of starting the supply of the pair of drafted slivers by the drafting roller means,   inserting the pair of drafted slivers into the false twisting means.   jointly gripping the pair of slivers at the outlet end of the false twisting means, and   inserting the slivers into the withdrawing means were they are fed to the wind-up means.   
     
     
       2. A process according to claim 1, wherein said inserting comprises using suction device sliver transfer means to first suck off the slivers from the drafting roller means and then to transfer them from the suction device sliver transfer means to a position where they are sucked into the false twisting means. 
     
     
       3. A process according to claim 2, wherein the suction device sliver transfer means are brought into the area of pairs of delivery rollers of the drafting roller means and are subsequently moved out of this area, in which case the false twisting means are moved into the area of the pairs of delivery rollers and then take over the slivers subsequent to movement of the suction device sliver transfer means out of this area. 
     
     
       4. A process according to claim 3, wherein the false twisting means, are acted upon by compressed air and automatically take in the slivers at least as soon as they are located in the area of the pairs of delivery rollers of the drawing roller means. 
     
     
       5. A process according to claim 1, wherein the jointly gripping of the pair of slivers at the outlet of the false-twisting means utilizes suction gripper means that receives both slivers and by means of which the slivers are jointly placed in the withdrawing means and are guided to the wind-up means. 
     
     
       6. A process according to claim 2, wherein the jointly gripping of the pair of slivers at the outlet of the false-twisting means utilizes suction gripper means that receives both slivers and by means of which the slivers are jointly placed in the withdrawing means and are guided to the wind-up means. 
     
     
       7. A process according to claim 1, wherein for each piecing operation, an empty spool shell is placed in the wind-up means to which the slivers are transferred that are fed jointly during the piecing. 
     
     
       8. A process according to claim 1, wherein the slivers that, during the piecing, are taken over jointly at the outlet of the false-twisting means, before the renewed winding-up, are connected with sliver ends that are withdrawn from the produced feed spool. 
     
     
       9. A process according to claim 1, wherein the presence of the slivers is monitored in the area behind the false-twisting means, and wherein in the case of a breakage of one or both slivers, the feeding of both slivers is interrupted. 
     
     
       10. A process according to claim 1, wherein the slivers are monitored before entering the drafting roller means, and in that if one sliver is absent, the further supply of the drafting roller means is interrupted. 
     
     
       11. A process according to claim 1, wherein when the supply of the sliver in interrupted, the false-twisting means are moved out of the area of pairs of delivery rollers of the drafting roller means, and means for aiding in the inserting of the pair of drafted slivers into the false-twisting means are moved into this area. 
     
     
       12. A process according to claim 1, wherein when the supply of slivers is interrupted, the withdrawal means are opened up and are not closed before the slivers are inserted during the piecing. 
     
     
       13. A process according to claim 1, wherein the drafting roller means are opened up for the interruption of the supply of the slivers. 
     
     
       14. A process according to claim 1, wherein for the interruption of the supply, the slivers are clamped into the drafting roller means before the insertion thereof into the false twisting means. .Iadd. 
     
     
       15.  A piecing process for piecing yarn components formed in a unit of the type having drafting means for supplying a plurality of drafted slivers, false twisting means for forming a plurality of yarn components from the plurality of drafted slivers, and joint feed spool forming means for forming feed spools with the plurality of yarn components jointly wound adjacent one another, which feed spools can be used in subsequent twisting operations or the like, said piecing process comprising the sequential steps of: starting the supply of the plurality of drafted slivers by the drafting means,   inserting the plurality of drafted slivers into the false twisting means;   gripping the plurality of yarn components at the outlet end of the false twisting means, and   transferring the plurality of yarn components to the joint feed spool forming means. .Iaddend. .Iadd.16. A piecing process according to claim 15, comprising supplying the yarn components transferred to the joint feed spool forming means to an empty spool shell to thereby facilitate a doffing operation with exchange of an empty spool shell for a completed feed spool. .Iaddend. .Iadd.17. A piecing process according to claim 15, comprising jointly winding up the plurality of yarn components onto a feed spool using wind-up means of the joint feed spool forming means. .Iaddend. .Iadd.18. A piecing process according to claim 17, comprising transferring the yarn components transferred to the joint feed spool forming means to   
     
     
        the wind-up means. .Iaddend. .Iadd.19.  A piecing process according to claim 18, comprising supplying the yarn components transferred to the joint feed spool forming means to an empty spool shell to thereby facilitate a doffing operation with exchange of an empty spool shell for a 
     
     
        completed feed spool. .Iaddend. .Iadd.20.  A piecing process according to claim 17, wherein the joint feed spool forming means includes withdrawing means disposed between the outlet end of the false twisting means and the wind-up means, and wherein said transferring of the yarn components includes movement of a gripping means which performs said gripping to a 
     
     
        position adjacent an inlet to the withdrawing means. .Iaddend. .Iadd.21. A piecing process according to claim 20, comprising supplying the yarn components transferred to the joint feed spool forming means to an empty spool shell to thereby facilitate a doffing operation with exchange of an 
     
     
        empty spool shell for a completed feed spool. .Iaddend. .Iadd.22.  A piecing process according to claim 20, wherein when the supply of slivers is interrupted, the withdrawal means are opened up and are not closed 
     
     
        before the slivers are inserted during the piecing. .Iaddend. .Iadd.23.  A piecing process according to claim 15, comprising supplying the yarn components transferred to the joint feed spool forming means to a splicing means for a splicing connection with previously spun yarn components. 
     
     
        .Iaddend. .Iadd.24.  A piecing process according to claim 23, wherein said previously spun yarn components are withdrawn from a partially completed feed spool. .Iaddend. .Iadd.25. A piecing process according to claim 23, wherein said splicing means is a pneumatic splicing means. .Iaddend. 
     
     
        .Iadd.6.  A piecing process according to claim 15, wherein said plurality of drafted slivers and yarn components is a pair of drafted slivers and yarn components. .Iaddend. .Iadd.27. A piecing process according to claim 26, wherein said inserting comprises using suction device sliver transfer means to first suck off the slivers from the drafting means and then to transfer them from the suction device sliver transfer means to a position where they are sucked into the false twisting means. .Iaddend. .Iadd.28. A piecing process according to claim 25, comprising bringing the suction device sliver transfer means into the area of pairs of delivery means of the drafting means and moving the suction device sliver transfer means out of this area, in which case the false twisting means are moved into the area of the pairs of delivery means and then take over the slivers subsequent to movement of the suction device sliver transfer means out of this area. .Iaddend. .Iadd.29. A piecing process according to claim 28, comprising supplying compressed air to the false twisting means such that they automatically take in the slivers at least as soon as they are located in the area of the pairs of delivery means of the drafting means. .Iaddend. .Iadd.30. A piecing process according to claim 26, wherein said gripping includes jointly gripping the pair of yarn components, and wherein the joint feed spool forming means includes wind-up means for jointly winding up the pair of yarn components onto a feed spool and withdrawing means disposed between the outlet of the false twisting means and the wind-up means. .Iaddend. .Iadd.31. A piecing process according to claim 30, wherein the jointly gripping of the pair of slivers at the outlet of the false-twisting means utilizes suction gripper means that receives both yarn components and by means of which the yarn components are jointly placed in the withdrawing means and are guided to the wind-up means. .Iaddend. .Iadd.32. A piecing process according to claim 31, wherein said inserting comprises using suction device sliver transfer means to first suck off the slivers from the drafting means and then to transfer them from the suction device sliver transfer means to a position 
     
     
        where they are sucked into the false twisting means. .Iaddend. .Iadd.33. A piecing process according to claim 32, wherein the suction device sliver transfer means are brought into the area of pairs of delivery means of the drafting means and are subsequently moved out of this area, in which case the false twisting means are moved into the area of the pairs of delivery means and then take over the slivers subsequent to movement of the suction device sliver transfer means of this area. .Iaddend. .Iadd.34. A piecing process according to claim 33, comprising supplying compressed air to the false twisting means such that they automatically take in the slivers at least as soon as they are located in the area of the pairs of delivery means of the drafting means. .Iaddend. .Iadd.35. A piecing process according to claim 26, comprising monitoring the presence of the yarn component in the area behind the false-twisting means, and wherein the case of a breakage of one or both yarn components, the feeding of both 
     
     
        slivers is interrupted. .Iaddend. .Iadd.36.  A piecing process according to claim 26, wherein the slivers are monitored before entering the drafting means, and wherein if one sliver is absent, the further supply of the drafting means is interrupted. .Iaddend. .Iadd.37. A piecing process according to claim 26, wherein when the supply of the slivers is interrupted, the false-twisting means are moved out of the area of the drafting means, and means for aiding in the inserting of the pair of drafted slivers into the false-twisting means are moved into this area. 
     
     
        .Iaddend. .Iadd.38.  A piecing process according to claim 15, comprising opening up the drafting means for the interruption of the supply of slivers prior to a piecing operation. .Iaddend. .Iadd.39. Piecing apparatus for piecing yarn components formed in a unit having: drafting means for supplying a plurality of drafted slivers,   false twisting means for forming a plurality of yarn components from the plurality of drafted slivers,   and joint feed spool forming means for forming feed spools with the plurality of yarn components, which feed spools can be used in subsequent twisting operations or the like,   said piecing apparatus comprising:   starting means for starting the supply of the plurality of drafted slivers by the drafting means,   inserting means for inserting the plurality of drafted slivers into the false twisting means,   gripping means for gripping the plurality of yarn components at the outlet end of the false twisting means, and   transferring means for transferring the plurality of yarn components to the   
     
     
        joint feed spool forming means. .Iaddend. .Iadd.40.  Piecing apparatus according to claim 39, wherein the transferring means includes means for supplying the yarn components to an empty spool shell to thereby facilitate a doffing operation with exchange of an empty spool shell for a 
     
     
        completed feed spool. .Iaddend. .Iadd.41.  Piecing apparatus according to claim 39, wherein the joint feed spool forming means includes wind-up means for jointly winding up the plurality of yarn components onto a feed 
     
     
        spool. .Iaddend. .Iadd.42.  Piecing apparatus according to claim 41, wherein the joint feed spool forming means includes withdrawing means disposed between the outlet end of the false twisting means and the wind-up means, and wherein said transferring means includes means for movement of the gripping means to a position adjacent an inlet to the withdrawing means. .Iaddend. .Iadd.43. Piecing apparatus according to claim 39, comprising a splicing means, wherein the yarn components transferred to the joint feed spool forming means are supplied to the splicing means for a splicing connection with previously spun yarn 
     
     
        components. .Iaddend. .Iadd.44.  Piecing apparatus according to claim 43, wherein said splicing means is a pneumatic splicing means. .Iaddend. .Iadd.45. Piecing apparatus according to claim 39, wherein said plurality of drafted slivers and yarn components is a pair of drafted slivers and yarn components. .Iaddend. .Iadd.46. Piecing apparatus according to claim 45, comprising a splicing means, wherein the yarn component transferred to the joint feed spool forming means are supplied to the splicing means for a splicing connection with previously spun yarn components, and wherein said splicing means is a pneumatic splicing means. .Iaddend. .Iadd.47. Piecing apparatus according to claim 45, wherein said plurality of drafted slivers and yarn components is a pair of drafted slivers and yarn components. .Iaddend.