Device for stacking sheet-shaped materials on sheet stacks

Abstract

A device stacks sheet-shaped materials ( 1, 1′ ) on a sheet stack with at least one deflecting element ( 82, 82′ ), mounted above the sheet stack and in the area of the leading edges ( 6, 6′ ) of the stacked sheet-shaped materials ( 1, 1′ ) so that it can rotate, and exhibiting at least one deflecting fin ( 83, 83′ ), whereby deflecting element ( 82, 82′ ) is driven and mounted so that it can rotate, whereby one deflecting fin ( 83, 83′ ) is in contact with the topmost sheet-shaped material ( 1 ) of the sheet stack that has already been stacked so that the leading edge ( 6′ ) of the next sheet-shaped material ( 1 ) to be stacked is deflected until the deflecting element ( 82, 82′ ), after stacking this next sheet-shaped material ( 1′ ), rotates far enough that a deflecting fin ( 83, 83′ ) is in contact with this sheet-shaped material ( 1′ ) that is now lying topmost.

1 . A device for stacking sheet-shaped materials on a sheet stack comprising: 
 at least one deflecting element rotatably mounted above the sheet stack and in the area of the leading edges of the stacked sheet-shaped materials and having at least one deflecting fin; and,    a controller for driving the deflecting element to rotate in a manner such that when one deflecting fin is in contact with a topmost sheet-shaped material of the sheet stack that has already been stacked, the leading edge of the next sheet-shaped material to be stacked is deflected until the deflecting element rotates far enough after stacking the next sheet-shaped material so that a deflecting fin is in contact with the sheet-shaped material lying topmost.    
     
     
         2 . A device according to  claim 1 , wherein the sheet stack is limited in transport direction by a stop, whereby the stop exhibits a radius in the area of the upper edge of the stack of the sheet-shaped materials stacked opposite the transport direction.  
     
     
         3 . A device according to  claim 2 , wherein the at least one deflecting element is congruent with the radius of the stop.  
     
     
         4 . A device according claims  1 , wherein at least one deflecting fin has a side element and wherein the surface of the side elements is formed at least in sections in such a way that during rotation of the deflecting elements the surface of the side elements lowers the leading edge of the topmost sheet-shaped material onto the stack of sheet-shaped materials.  
     
     
         5 . A device according to  claim 4 , wherein at least one side element exhibits a tab following the deflecting fin in rotation direction of the deflecting element, whereby the dimensions of said tab suppress a spreading of the sheet-shaped materials already stacked in the area of the leading edges of sheet-shaped materials.  
     
     
         6 . A device according to  claim 4 , wherein the surface of at least two side elements is formed in such a way that it provides a vertical stop for the deflected sheet-shaped material.  
     
     
         7 . A device according to  claim 4 , wherein the surface of at least one of the outer side elements is formed in such a way that it exhibits a recess in the area of the tip of the deflecting fins.  
     
     
         8 . A device according to  claim 1 , wherein at least two deflecting elements are arranged essentially symmetrical to the center line of the transport movement.  
     
     
         9 . A device according to  claim 8 , wherein the outermost deflecting elements are mounted in active connection with a threaded shaft exhibiting two opposing threads so that they can slide laterally.  
     
     
         10 . A device according to one of  claim 8 , wherein the outermost deflecting elements are mounted so that they can slide dependent on the dimensions of the sheet-shaped materials.  
     
     
         11 . A device according to  claim 10 , further comprising a measuring unit for measuring the position of the outermost deflecting elements.  
     
     
         12 . A device according to one of  claim 1 , wherein the tip of the deflecting fins is curve shaped.  
     
     
         13 . A device according to one of  claim 1 , further comprising at least one driving fin mounted so that it can rotate above the stack of sheet-shaped materials in such a way that during rotation of the driving fin, the end of the driving fin comes in contact with the topmost sheet-shaped material on the stack and moves this topmost sheet-shaped material in the transport direction.  
     
     
         14 . A device according to  claim 13 , wherein at least two driving fins are provided, whereby at least one driving fin is more elastic and longer than at least one other driving fin.  
     
     
         15 . A device according to one of claims  1 , further comprising at least one hold-down element disposed above the stack of sheet-shaped materials to guide the next sheet-shaped material onto the stack of sheet-shaped materials.  
     
     
         16 . A device according to  claim 15 , further comprising a measuring unit and wherein the hold-down element further comprises a hold-down lug that extends into the measuring unit, whereby the measuring unit determines the height of the stack of the sheet-shaped materials.  
     
     
         17 . A device according to  claim 16 , further comprising a height-adjustable stacking element on which the stack of sheet-shaped materials is deposited and a controller which uses the signal from the measuring unit to maintain the position of the topmost sheet-shaped material essentially constant using the height-adjustable stacking element.