Draw-off device for narrow fabric looms

Abstract

The invention relates to a draw-off device comprising elastic belts ( 1, 2 ) for producing curved woven composites on narrow fabric looms. The draw-off device consists of two respective circulatory endless belts ( 1, 2 ), each of which is guided around a driving roller ( 3, 4 ) and a deflecting roller ( 5, 6, 7, 8, 9, 10 ). In addition to the driving rollers ( 3, 4 ), the edge regions of the belts ( 1, 2 ) also have extension drive mechanisms ( 11, 12, 13, 14 ) that only engage with the outer edges of said belts ( 1, 2 ). The belts ( 1, 2 ) preferably have a cross-denticulation which is located on the edges of the sides facing the driving rollers ( 3, 4 ), or which is continuous. The side of the belts facing away from the driving rollers is preferably structured. The radius of curvature of the woven composites can be adjusted by modifying the rotational speed differential between the extension drive mechanisms ( 11, 12, 13, 14 ) and the driving rollers ( 3, 4 ). It is not necessary to stop the loom in order to adjust the direction and radius of curvature.

1 . A withdrawal apparatus with elastic belts for the production of curved woven composites on narrow material looms, characterized in that the withdrawal apparatus is comprised respectively of two circulating, endless loop elastic belts, each of which is trained around a drive roller and a change of direction roller, whereby the belts comprise, in addition to the drive rollers, expansion drives on both sides of the edge regions of the belts which only engage the outer edges of the belts.  
     
     
         2 . A withdrawal apparatus according to  claim 1  and  2 , characterized in that the belts preferably comprise, on the edge regions, a transverse tooth structure on the sides thereof trained around the drive rollers.  
     
     
         3 . A withdrawal apparatus according to  claim 1  and  2 , characterized in that the belts, on the sides thereof facing away from the drive rollers, are structured with geometric projections and recesses.  
     
     
         4 . A withdrawal apparatus according to  claim 1  and  2 , characterized in that the change of direction rollers comprise roller plates or discs which are independently rotatable individually one from another.  
     
     
         5 . A withdrawal apparatus according to  claim 1  to  4 , characterized in that the axes of the change of direction rollers are spring-cushioned in their mountings.