Apron drafting systems

Abstract

An apron drafting system for a spinning machine, in particular an air spinning machine, with a bottom apron guided over a drivable bottom roller, the bottom apron being supported in the area of a drawing zone, in particular a main drawing zone, by a sliding section of an apron bridge. In order to provide an apron drafting system in which reliable guidance of the bottom apron is ensured while maintaining a high drive power, there is provision for the apron bridge for guiding the bottom apron to have a line section with guiding means for lateral guidance of the bottom apron circulating around the apron bridge.

What is claimed is: 
     
         1 . An apron drafting system for a spinning machine with a bottom apron guided over a drivable bottom roller, the bottom apron being supported in the area of a drawing zone by a sliding section of an apron bridge,
 characterized in that   the apron bridge for guiding the bottom apron has a line section with a guide for lateral guidance of the bottom apron circulating around the apron bridge.   
     
     
         2 . The apron drafting system according to  claim 1 , wherein the spinning machine is an air spinning machine. 
     
     
         3 . The apron drafting system according to  claim 1 , wherein the drawing zone is a main drawing zone. 
     
     
         4 . The apron drafting system according to  claim 1 , characterized in that the apron bridge has two guide bars arranged at a distance from one another and laterally enclosing the bottom apron in the area of the line section. 
     
     
         5 . The apron drafting system according to  claim 1 , characterized in that the guide bars have a sliding coating in the area of contact with the bottom apron. 
     
     
         6 . The apron drafting system according to  claim 1 , characterized in that the guide bars are arranged on a stabilizing bar which is arranged in an area of the apron bridge opposite the sliding section. 
     
     
         7 . The apron drafting system according to  claim 1 , characterized in that adjustment of a drafting system carriage with the bottom roller, the bottom apron and the apron bridge and/or the apron bridge in relation to the drafting system carriage, is transverse to the circumferential direction of the bottom apron. 
     
     
         8 . The apron drafting system according to  claim 7 , characterized in that the apron bridge and/or the drafting system carriage is connected to an adjusting drive for adjustment of the apron bridge in relation to the drafting system carriage and/or of the drafting system carriage transversely to the circumferential direction of the bottom apron. 
     
     
         9 . The apron drafting system according to  claim 1 , characterized in that the adjusting drive is connected to a control device for defining the adjustment movement of the drafting system carriage and/or the apron bridge. 
     
     
         10 . The apron drafting system according to  claim 9 , wherein the adjusting drive is connected to a control device for defining the adjustment length and the adjustment frequency.