Delivery device in sheet-fed offset rotary printing press

Abstract

A delivery device in a sheet-fed offset rotary printing press includes a plurality of suction units, at least one discharge unit, at least one support member, and an intake source, air exhaust system, and switching device. The plurality of suction units are arranged above a pile board on an upstream sheet convey direction side below a sheet under conveyance in a widthwise direction of the sheet, and draw by suction the sheet under conveyance in slidable contact with it. At least one discharge unit replaces one of the plurality of suction units which is other than those on two ends, and discharges air outwardly in the widthwise direction of the sheet under conveyance. One of the plurality of suction units which is other than those on the two ends and the discharge unit can be mounted selectively on at least one support member. The intake source, air exhaust system, and switching device supply suction air to the suction unit when the suction unit is mounted on the support member, and supply discharge air to the discharge unit when the discharge unit is mounted on the support member.

1 . A delivery device in a sheet-fed offset rotary printing press, comprising: 
 a plurality of suction units which are arranged above a pile board on an upstream sheet convey direction side below a sheet under conveyance in a widthwise direction of the sheet and which draw by suction the sheet under conveyance in slidable contact therewith;    at least one discharge unit which replaces one of said plurality of suction units which is other than those on two ends and which discharges air outwardly in the widthwise direction of the sheet under conveyance;    at least one support member on which said one of said plurality of suction units which is other than those on the two ends and said discharge unit can be mounted selectively; and    air switching means for supplying suction air to said suction unit when said suction unit is mounted on said support member and supplying discharge air to said discharge means when said discharge means is mounted on said support member.    
   
   
       2 . A device according to  claim 1 , further comprising a mounting structure with which said one of said plurality of suction units which is other than those on the two ends and said discharge unit are commonly mounted on said support member.  
   
   
       3 . A device according to  claim 2 , wherein said mounting structure comprises 
 an engaging target portion provided to said support member and    an engaging member to engage with said engaging target member,    said engaging member serving to engage with said engaging target portion to selectively fix said one of said plurality of suction units which is other than those on the two ends and said discharge unit to said support member.    
   
   
       4 . A device according to  claim 3 , wherein 
 said engaging target portion comprises a screw hole formed in said support member, and    said engaging member comprises a bolt which is to be threadably engaged in said screw hole through an insertion hole formed in said one of said plurality of suction units which is other than those on the two ends and said discharge unit.    
   
   
       5 . A device according to  claim 1 , wherein said air switching means comprises 
 an air intake source which supplies suction air to said suction unit,    an air exhaust source which supplies discharge air to said discharge unit, and    a switching valve which switches a first air passage connected to said suction unit/discharge unit between a second air passage connected to said air intake source and a third air passage connected to said air exhaust source.    
   
   
       6 . A device according to  claim 1 , wherein said air switching means is provided to correspond to said one of said plurality of suction units which is other than those on the two ends.  
   
   
       7 . A device according to  claim 6 , further comprising a manipulation portion which switches said air switching means when said one of said plurality of suction units which is other than those on the two ends is replaced by said discharge unit.  
   
   
       8 . A device according to  claim 1 , wherein said discharge unit which is arranged at a portion other than a center in the sheet widthwise direction comprises a plurality of air blowing ports which blow air from a center of the sheet under conveyance toward one end in the sheet widthwise direction.  
   
   
       9 . A device according to  claim 1 , wherein said discharge unit which is arranged at a center in the sheet widthwise direction comprises a plurality of air blowing ports which blow air from a center of the sheet under conveyance toward the two ends in the sheet widthwise direction.  
   
   
       10 . A device according to  claim 1 , wherein said discharge unit comprises a plurality of discharge ports which discharge air substantially perpendicularly toward a lower surface of the sheet under conveyance.  
   
   
       11 . A device according to  claim 1 , wherein each of said suction units comprises a suction wheel.  
   
   
       12 . A device according to  claim 11 , wherein said suction wheel comprises a belt type suction wheel.  
   
   
       13 . A device according to  claim 1 , wherein each of said suction units includes a suction surface which draws by suction the sheet under conveyance to be in slidable contact therewith.  
   
   
       14 . A device according to  claim 1 , further comprising 
 a first driving member which is provided to said support member, and    a second driving member which is provided to each of said suction units and is connected to said first driving member,    wherein each of said suction unit comprises suction means which is rotatably driven by said second driving member, and    when said first driving member is driven with each of said suction units being mounted on said support member, said suction means rotates through said second driving member.    
   
   
       15 . A device according to  claim 1 , wherein 
 said support member comprises a screw hole and first opening which are common between each of said suction units and said discharge unit,    each of said suction units comprises a first insertion port and second opening which correspond to said screw hole and first opening of said support member, and    said discharge unit comprises a second insertion port and third opening which correspond to said screw hole and first opening of said support member.    
   
   
       16 . A device according to  claim 1 , wherein 
 said support member comprises a plurality of support members arranged in the widthwise direction of the sheet, and    said plurality of support members selectively support said suction unit/discharge unit.    
   
   
       17 . A device according to  claim 1 , further comprising a screw shaft which is supported by a frame and supports said support member to be movable in the widthwise direction of the sheet, 
 wherein when said screw shaft is operated, said support member is moved in accordance with a sheet size.