Rotary lifting table

Abstract

The rotary lifting table is equipped with a rotary lifting table plate ( 14 ) for supporting planar articles ( 12 ) and two ejection devices ( 20 ) which are located opposite one another and define a stacking shaft ( 16 ) and are intended for ejecting the stacked planar articles ( 12 ). In addition, it has, according to the invention, a sliding plate ( 26 ) having air discharge openings ( 34 ), through which pressurized air escapes during the removal of a stack of planar articles ( 12 ) and thus makes possible low-friction sliding of the stack from the stacking shaft ( 16 ).

1 . A rotary lifting table having a rotary lifting table plate ( 14 ) for supporting planar articles ( 12 ), in particular printed products, and two ejection devices ( 20 ) which are located opposite one another and define a stacking shaft ( 16 ) and by means of which stacked planar articles ( 12 ) can be removed in at least one ejection direction (A, A′), the stacking shaft ( 16 ) being bounded at the bottom at least partly by the rotary lifting table plate ( 14 ), and the ejection devices ( 20 ) being arranged on a turntable ( 30 ) connected to the rotary lifting table plate ( 14 ) in a rotationally fixed manner, comprising a sliding plate ( 26 ) which has air discharge openings ( 34 ) and makes possible low-friction sliding from the stacking shaft ( 16 ) in the ejection direction (A, A′) during the removal of the stack of planar articles ( 12 ). 
   
   
       2 . The rotary lifting table as claimed in  claim 1 , wherein the sliding plate ( 26 ) extends into the stacking shaft ( 16 ). 
   
   
       3 . The rotary lifting table as claimed in  claim 1 , wherein the sliding plate ( 26 ) is arranged to rotate with the rotary lifting table plate ( 14 ). 
   
   
       4 . The rotary lifting table as claimed in  claim 3 , wherein the sliding plate ( 26 ) is fastened to the turntable ( 30 ). 
   
   
       5 . The rotary lifting table as claimed in  claim 1 , wherein the rotary lifting table plate ( 14 ) and the sliding plate ( 26 ) are in engagement with one another during the removal of the stack of planar articles ( 12 ). 
   
   
       6 . The rotary lifting table as claimed in  claim 1 , wherein pressurized air can escape from the air discharge openings ( 34 ) in such a way that an air cushion forms between the lowermost planar article of the stack of planar articles ( 12 ) and a sliding surface ( 32 ), facing this lowermost planar article, of the sliding plate ( 26 ). 
   
   
       7 . The rotary lifting table as claimed in  claim 6 , wherein the air discharge openings ( 34 ) widen toward the sliding surface ( 32 ). 
   
   
       8 . The rotary lifting table as claimed in  claim 1 , wherein the air discharge openings ( 34 ) are arranged in a repetitive pattern, preferably in a regularly distributed manner at least in sections. 
   
   
       9 . The rotary lifting table as claimed in  claim 1 , wherein a flexible air feed line ( 40 ,  40 A) is guided in a movable trailing cable ( 42 ) for feeding pressurized air to the sliding plate ( 26 ), said trailing cable ( 42 ) being fixedly arranged relative to the turntable ( 30 ) on the side of the rotary lifting table. 
   
   
       10 . The rotary lifting table as claimed in  claim 1 , wherein two ejection directions (A, A′) having a diametrically opposite sense of direction are defined by the stacking shaft ( 16 ), and one sliding plate ( 26 ) each is arranged in a respective ejection direction (A, A′). 
   
   
       11 . The rotary lifting table as claimed in  claim 1 , wherein the sliding plate ( 26 ) extends between the stacking shaft ( 16 ) and an associated conveyor, in particular an outfeed conveyor ( 28 ). 
   
   
       12 . The rotary lifting table as claimed in  claim 1 , wherein the rotary lifting table plate ( 14 ) is also provided with air discharge openings ( 34 ), from which pressurized air can escape. 
   
   
       13 . The rotary lifting table as claimed in  claim 1 , wherein the pressure of the air escaping from the sliding plate ( 26 ) is preferably established as a function of the weight of the supported planar articles ( 12 ) and/or of a rotary/lifting state of the rotary lifting table plate ( 14 ) via a pressure-regulating device ( 44 ).