Control device, device for fixing a stack of paper sheets and unstacking device

Abstract

The invention relates to a control device for the removal of a partial stack from a stack of paper sheets comprising a camera ( 30 ) for generating of a camera image, means ( 41 ) for generating of at least two substantially parallel light beams whose reflections ( 52, 53 ) on the stack of paper sheets are reproduced in the camera image ( 50 ), and means providing a control signal for the removal of a partial stack ( 12 ) using the distance ( 54 ) of the reflections ( 52, 53 ) in the camera image ( 50 ). Furthermore, the invention relates to un unstacking device for the removal of a partial stack from a stack of paper sheets, comprising a parting mechanism ( 20 ) with a parting knife ( 21 ), wherein the parting knife ( 21 ) can be swivelled upwards and/or downwards in order to be able to follow the paper progress upwards and/or downwards during unstacking.

1 . A control device for the removal of a partial stack from a stack of paper sheets, comprising:
 a. a camera ( 30 ) for generating a camera image;   b. means ( 41 ) for generating of at least two substantially parallel light beams whose reflections ( 52 ,  53 ) are reproduced on a stack of pa-per sheets in the camera image ( 50 ); and   c. means providing a control signal for the removal of a partial stack ( 12 ) using the distance ( 54 ) of the reflections ( 52 ,  53 ) in the camera image ( 50 ).   
   
   
       2 . The control device according to  claim 1 , wherein the light beams extend substantially parallel to the plane of the paper sheets. 
   
   
       3 . The control device according to  claim 1 , having a further light beam to determine the distance between the camera and the stack of paper sheets. 
   
   
       4 . The control device according to  claim 3 , wherein the third light beam is not parallel to the other light beams. 
   
   
       5 . An unstacking device, comprising a control device according to  claim 1 . 
   
   
       6 . The unstacking device according to  claim 5 , further comprising a device for fixing paper sheets, wherein the device comprises means for inserting of electrostatic charge ( 60 ) into the stack of paper sheets. 
   
   
       7 . The unstacking device according to  claim 6 , wherein the means for insert-ing of electrostatic charge ( 60 ) are formed so that a partial stack of paper sheets, in particular a partial stack ( 12 ) of paper sheets to be removed, or a remaining residual blank stack ( 11 ) are fixed. 
   
   
       8 . The unstacking device according to  claim 5 , further comprising a parting mechanism ( 20 ) with a parting knife ( 21 ). 
   
   
       9 . The unstacking device according to  claim 8 , wherein the parting knife is formed so that it can be swivelled downward. 
   
   
       10 . The unstacking device according to  claim 9 , wherein the parting knife ( 21 ) can be swivelled downward by an angle a so that it is substantially parallel to the lower side of the partial stack which contacts the parting knife. 
   
   
       11 . The unstacking device according to  claim 8 , further compris-ing a lifting device for the stack of paper sheets which lowers the residual blank stack after a broaching with the parting knife ( 21 ). 
   
   
       12 . The unstacking device according to  claim 11 , wherein the lifting device is preferably servo-controlled and comprises highly precise ball spindles free of play. 
   
   
       13 . (canceled) 
   
   
       14 . (canceled)