Method for conveying printing-material sheet by a belt conveyor, and a belt conveyor suited therefor

Abstract

A belt conveyor of a printing-material sheet processing machine includes a belt for transporting the printing-material sheets, the belt having openings, and a roller, which has pins for engaging in the openings. At least one ring is rotatably mounted on the roller, relative to the pins, the belt lying on the ring. This belt conveyor is suited for conveying a printing-material sheet, wherein the belt is driven by the roller virtually exclusively via a form lock between the pins and the openings and virtually without a friction lock between the inner surface of the belt and the peripheral surface of the roller. The belt conveyor may be, for example, a sheet brake of a delivery of a printing press.

1 . A method of conveying printing-material sheets, which comprises: 
 providing a belt conveyor with a belt for transporting the printing-material sheets, the belt having openings formed therein, and with a roller for guiding the belt, the roller having pins disposed and formed for engaging in the openings formed in the belt;    driving the belt with the roller substantially exclusively via a form lock between the pins and the openings and substantially not by friction between an inner surface of the belt and a peripheral surface of the roller; and    transporting the printing-material sheets on the belt.    
     
     
         2 . A belt conveyor of a printing-material sheet processing machine, comprising: 
 a belt for transporting printing-material sheets, the belt having openings formed therein;    a roller having pins disposed to engage in said openings in said belt;    at least one ring mounted on said roller rotatably relative to said pins, with said belt lying on said ring.    
     
     
         3 . The belt conveyor according to  claim 2 , wherein said ring is one of a plurality of rings including a first ring and a second ring supporting said belt on said roller, and said pins are arranged along a row on a periphery of said roller between said first ring and said second ring.  
     
     
         4 . The belt conveyor according to  claim 3 , wherein each of said first and second rings is formed as a sliding bearing.  
     
     
         5 . The belt conveyor according to  claim 3 , wherein each of said first and second rings is formed as a roller bearing.  
     
     
         6 . The belt conveyor according to  claim 3 , wherein said roller is formed with two steps each rotatably supporting a respective one of said first and second rings.  
     
     
         7 . The belt conveyor according to  claim 2 , wherein said at least one ring forms a sliding bearing on said roller.  
     
     
         8 . The belt conveyor according to  claim 2 , wherein said at least one ring is formed with a roller bearing on said roller.  
     
     
         9 . The belt conveyor according to  claim 2 , wherein said roller is formed with a step, and said ring is rotatably seated on said step.  
     
     
         10 . In combination with a sheet delivery of a printing-material sheet processing machine, the belt conveyor according to  claim 2  disposed in the sheet delivery.  
     
     
         11 . In combination with a printing press, a belt conveyor according to  claim 2 .  
     
     
         12 . A belt conveyor for conveying printing-material sheets, comprising: 
 a belt for transporting printing-material sheets, the belt having openings formed therein;    a roller having pins disposed thereon to engage in said openings in said belt;    one or more rings rotatably supported on said roller;    wherein, when said belt is driven via a form lock between said pins and said openings in said belt, said belt lies on said one or more rings and said one or more rings rotate about said roller.