Apparatus For Depositing A Sheet On A Stack

Abstract

The present invention relates to an apparatus for depositing a sheet on a stack ( 11 ), preferably for a delivery unit of a printing machine, which said apparatus comprises at least one stacking device which can be driven so as to rotate about an axis of rotation in order to grasp and deposit the sheet, and comprises at least one drag element ( 1 ), which is arranged on the stacking device and carried along during rotation, whereby said drag element ( 1 ) is provided for shifting the last deposited sheet, in particular, for pulling said sheet toward a stack abutment ( 12 ). The present invention is to solve the problem of making the operation of aligning the last deposited sheet more reliable and precise. In accordance with the invention, this problem has been solved in that at least one drag element ( 1 ) is arranged, relative to the axis of rotation, on the radial exterior side of the at least one stacking member ( 13, 14, 17 ).

1 . Apparatus for depositing a sheet on a stack, preferably for the delivery unit of a printing machine, 
 that comprises at least one stacking device which can be driven so as to rotate about an axis of rotation in order to grasp and deposit the sheet, and that comprises at least one drag element which is arranged on the stacking device and carried along during rotation, whereby said drag element is provided for shifting the last deposited sheet, in particular, for pulling said sheet toward a stack abutment,    characterized in that    the at least one drag element is arranged, relative to the axis of rotation, on a radial exterior side of at least one stacking member.    
   
   
       2 . Apparatus as in  claim 1 , characterized in that the stacking device comprises at least one input means, into which the leading edge of a sheet to be stacked can be fed, and that the drag element is arranged, relative to the axis of rotation, on a radial exterior side of the at least one input means.  
   
   
       3 . Apparatus as in  claim 2 , characterized in that respectively one drag element is arranged on each available input means.  
   
   
       4 . Apparatus as in one of the previous claims, characterized in that the drag element is substantially tongue-shaped.  
   
   
       5 . Apparatus as in one of the previous claims, characterized in that the drag element extends so as to project outward from the exterior side.  
   
   
       6 . Apparatus as in claims  4  and  5 , characterized in that the drag element extends at an acute angle (wedge angle) outward from the exterior side, against the direction of rotation of the drivable stacking member.  
   
   
       7 . Apparatus as in one of the previous claims, characterized in that the drag element features a rubber-like material.  
   
   
       8 . Apparatus as in one of the previous claims, characterized in that the drag element features a metal reinforcement.