Delivery device in sheet-fed offset rotary printing press

Abstract

A delivery device in a sheet-fed offset rotary printing press includes a vertically movable pile board, suction unit, detection bar, and limit switch. A conveyed sheet is to be placed on the pile board. The suction unit is arranged on an upstream side in a sheet convey direction above the pile board and under a sheet to be conveyed, and has a suction surface to suck the sheet while in slidable contact with it. The detection bar is supported under the suction unit to be movable in a vertical direction and extends in a widthwise direction of the sheet to be conveyed. The limit switch detects movement of the detection bar in the vertical direction.

1 . A delivery device in a sheet-fed offset rotary printing press, comprising: 
 a vertically movable pile board on which a conveyed sheet is to be placed;    a suction unit which is arranged on an upstream side in a sheet convey direction above said pile board and under a sheet to be conveyed and has a suction surface to suck the sheet while in slidable contact therewith;    a detection body which is supported under said suction unit to be movable in a vertical direction and extends in a widthwise direction of the sheet to be conveyed; and    detection means for detecting movement of said detection body in the vertical direction.    
     
     
         2 . A device according to  claim 1 , wherein said detection body comprises an elongated detection bar supported to be vertically movable.  
     
     
         3 . A device according to  claim 2 , wherein said detection bar is supported by a plurality of support members which are arranged in the widthwise direction of the sheet to be conveyed.  
     
     
         4 . A device according to  claim 3 , wherein 
 said detection bar is arranged in the widthwise direction of the sheet to be conveyed and has a plurality of elongated holes respectively forming ellipses whose major axes are aligned in the vertical direction, and    said plurality of support members are engaged in the elongated holes to suspend and support said detection bar.    
     
     
         5 . A device according to  claim 2 , wherein said detection bar is movable obliquely.  
     
     
         6 . A device according to  claim 5 , wherein the elongated holes have gaps in the widthwise direction with respect to said support members.  
     
     
         7 . A device according to  claim 1 , wherein said detection means comprises a detection switch which is provided to one end side in the widthwise direction of the sheet to be conveyed and detects movement in the vertical movement of at least one end of said detection bar.  
     
     
         8 . A device according to  claim 1 , wherein said detection means comprises a pair of detection switches which are provided on two end sides in the widthwise direction of the sheet to be conveyed and detect upward movement of two ends of said detection bar.  
     
     
         9 . A device according to  claim 1 , wherein said detection body moves upon abutting against an object on said pile board.  
     
     
         10 . A device according to  claim 1 , further comprising driving means for driving said pile board to move upward, 
 said driving means being stopped when said detection means detects movement of said detection body.    
     
     
         11 . A device according to  claim 1 , wherein said detection body is pivotally supported in a sheet convey direction as well.  
     
     
         12 . A device according to  claim 11 , further comprising 
 a pair of delivery pile plate guides with U-shaped sections which extend in the sheet convey direction in the vicinity of an upward movement limit of said pile board and are arranged parallel to each other such that openings thereof oppose each other, and    a delivery pile plate to be inserted and supported in the openings of said pair of delivery pile plate guides,    wherein said detection body pivots when said delivery pile plate is inserted in said delivery pile plate guides.    
     
     
         13 . A device according to  claim 11 , further comprising 
 a stay which is supported between a pair of frames that oppose each other at a predetermined gap,    a block which is pivotally supported by said stay, and    a shaft which is supported by said block and supports said detection body to be movable in the vertical direction.    
     
     
         14 . A device according to  claim 13 , further comprising a pin which is supported by said stay in a direction of length of said stay, 
 wherein said block is pivotally supported by said pin.