Device for stacking tube sections for producing bags

Abstract

Device for stacking tube sections ( 30 ) for producing bags, with a transporting facility ( 12 ), which supplies the tube sections to a stacking station ( 10 ), characterized in that the transporting facility ( 12 ) has an upper transport ( 14 ) and a lower transport ( 16 ) and that the lower transport ( 16 ) is formed in the region of the stacking station ( 10 ) by two endless conveyor belts ( 44 ), which revolve above the stacking station outside of the lateral edges of the tube sections ( 30 ) and are connected by at least two cross members ( 48, 50 ), which are disposed with uniform spacings, the spacings of which corresponding to the spacings between the leading edges of consecutively supplied tube sections ( 30 ).

What is claimed is:  
     
         1 . Device for stacking tube sections for producing bags, comprising a transporting facility which supplies the tube sections to a stacking station the transporting facility including: 
 an upper transport,    a lower transport formed in a region of the stacking station by two endless conveyor belts, which revolve above the stacking station outside of lateral edges of the tube sections, and    at least two cross members which connect the two endless conveyor belts and which are disposed with uniform spacings corresponding to spacings between leading edges of consecutively supplied tube sections.    
     
     
         2 . The device of  claim 1 , wherein downstream ends of the lower transport and the upper transport are offset relative to one another in a longitudinal direction thereof.  
     
     
         3 . The device of  claim 1 , wherein at least one leaf spring is disposed in the upper transport and presses the tube section provided downward in a direction of the stacking station.  
     
     
         4 . The device of  claim 1 , wherein the transporting facility has an inlet section, in which a vertical distance between the upper and lower conveyor belts decreases in a transporting direction.  
     
     
         5 . The device of  claim 4 , further comprising a length-adjustable clamping roller in the inlet section, which deflects the upper conveyor belt against the lower conveyor belt, in order to take hold of the leading edge of a tube section, which has been supplied.  
     
     
         6 . The transporting facility of  claim 1 , further comprising a severing device upstream from the transporting facility, with which an endless tube is divided into tube sections.  
     
     
         7 . The device of  claim 6 , wherein the severing device has a tear-of head, which tears off the tube sections at pre-perforated places from an endless tube.  
     
     
         8 . The device of  claim 6 , wherein a transporting speed of the transporting facility is greater than a speed with which the tube is supplied upstream to the severing device.  
     
     
         9 . A method for stacking tube sections used for producing bags, comprising the steps of: 
 holding a tube section in a transporting facility with a leading edge thereof clamped between a cross member of a lower transport and an upper transport, and supplying the tube section to a position above a stacking station, while a different cross member of the lower transport, which is returning above the stacking station to an upstream end of the transporting facility, holds a trailing, rear end of the tube section away from the stack, until the leading edge is released by the first cross member and the tube section falls onto the stack.    
     
     
         10 . The device of  claim 2 , wherein at least one leaf spring is disposed in the upper transport and presses the tube section provided downward in a direction of the stacking station.  
     
     
         11 . The device of  claim 2 , wherein the transporting facility has an inlet section, in which a vertical distance between the upper and lower conveyor belts decreases in a transporting direction.  
     
     
         12 . The device of  claim 3 , wherein the transporting facility has an inlet section, in which a vertical distance between the upper and lower conveyor belts decreases in a transporting direction.  
     
     
         13 . The transporting facility of  claim 2 , further comprising a severing device upstream from the transporting facility, with which an endless tube is divided into tube sections.  
     
     
         14 . The transporting facility of  claim 3 , further comprising a severing device upstream from the transporting facility, with which an endless tube is divided into tube sections.  
     
     
         15 . The transporting facility of  claim 4 , further comprising a severing device upstream from the transporting facility, with which an endless tube is divided into tube sections.  
     
     
         16 . The transporting facility of  claim 5 , further comprising a severing device upstream from the transporting facility, with which an endless tube is divided into tube sections.  
     
     
         17 . The device of  claim 7 , wherein a transporting speed of the transporting facility is greater than a speed, with which the tube is supplied upstream to the severing device.