Method and apparatus for producing cross-wound bobbins

Abstract

In a process for producing cross-wound packages in a yarn winding device of a textile machine, the helix angle of the wound-on yarn changes during winding on. The helix angle is a variable chosen in dependence on the diameter of the yarn package. This diameter of the package is in turn calculated on the basis of the length of the yarn already wound on. An arrangement for producing cross-wound packages on a number of yarn winding devices comprises a drive for rotating the cross-wound package. A variable, driveable yarn guide is provided at each yarn winding device for laying a yarn in axial direction of the cross-wound package at a variable helix angle. A common sensor for measuring the package diameter at a number of yarn winding devices is provided, which sensor can be positioned to the yarn winding devices one after another.

1 . A process for producing cross-wound packages at a winding head of a textile machine, whereby the helix angle of the wound on yarn changes during winding on, characterized in that the helix angle is selected in dependence on the cross-wound package diameter, and in that the cross-wound package diameter is calculated on the basis of the length of the yarn already wound on. 
     
     
         2 . A process according to  claim 1 , wherein in the calculation of the cross-wound package diameter, the yarn tension and/or the helix angle, with which the yarn was wound on, is taken into consideration. 
     
     
         3 . A process according  claim 1 , wherein a reference measurement of the cross-wound package diameter is carried out, in order to correct the calculated value of the cross-wound package diameter. 
     
     
         4 . An arrangement for producing cross-wound packages ( 6 ) at a number of winding heads ( 5 ) of a textile machine comprising a drive ( 13 ) for rotating the cross-wound package ( 6 ) and also comprising at each winding head ( 5 ) a variably driveable yarn guide ( 9 ) for placing a yarn ( 2 ) to be wound on in axial direction of the cross-wound package ( 6 ) at a variable helix angle (α), wherein a control system ( 18 ) for calculating the cross-wound package diameter (D) on the basis of the amount of yarn ( 2 ) already wound on is provided, said control system ( 18 ) being connected to the drive ( 17 ) of the yarn guide ( 9 ). 
     
     
         5 . An arrangement according to  claim 4 , wherein a common sensor ( 19 ) is provided for measuring the cross-wound package diameter (D) at a number of winding heads ( 5 ). 
     
     
         6 . An arrangement according to  claim 4 , wherein the sensor ( 19 ) is positionable to the winding heads ( 5 ) one after another. 
     
     
         7 . An arrangement according to  claim 4 , wherein the sensor ( 19 ) is arranged on a travelling carriage ( 20 ) which is driven along the length of the textile machine. 
     
     
         8 . An arrangement according to  claim 4 , wherein the sensor ( 19 ) is positionable directly to a cross-wound package. 
     
     
         9 . An arrangement according to  claim 4 , wherein the sensor ( 19 ) is positionable to a package cradle ( 12 ) for taking up a tube ( 10 ) of the cross-wound package ( 6 ).