Device for controlling a pneumatic consumer in a sheet-processing machine, in particular a rotary printing press or diecutter, and rotary printing press or diecutter having the device

Abstract

A device for controlling a pneumatic consumer in a sheet-processing machine, for example a printing press or a diecutter, includes a rotary valve supplying a fluid, such as suction air, to the pneumatic consumer to be driven in a sinusoidal manner in accordance with a cycle of the sheet-processing machine. The rotary valve is drivable by an electric motor for increased flexibility. A rotary printing press or diecutter having the device is also provided.

1 . A device for controlling a pneumatic consumer in a sheet-processing machine, the device comprising:
 a rotary valve communicating with the pneumatic consumer; and   an individual drive configured to drive said rotary valve, said individual drive being an electric motor configured to be driven in accordance with a sinusoidal or non-uniform movement profile.   
     
     
         2 . The device according to  claim 1 , wherein said rotary valve includes a rotor with a single track. 
     
     
         3 . The device according to  claim 1 , wherein said rotary valve includes an inlet and two outlets. 
     
     
         4 . A sheet-processing machine, comprising:
 a feed table for guiding sheets in a sheet travel direction;   front lays associated with said feed table;   a pneumatic consumer being a suction bar disposed above said feed table and positioned within a distance upstream of said front lays in said sheet travel direction; and   a device for controlling said pneumatic consumer.   
     
     
         5 . The device according to  claim 4 , wherein said suction bar includes a crossbar aligned perpendicular to said sheet travel direction and a plurality of suction chambers disposed adjacent each other on said crossbar. 
     
     
         6 . The device according to  claim 5 , wherein each of said suction chambers includes suction openings directed downward towards an upper side of the sheets. 
     
     
         7 . The device according to  claim 6 , wherein said suction chambers include a central suction chamber having a width approximately equal to a smallest sheet format to be processed. 
     
     
         8 . The device according to  claim 7 , wherein said suction chambers include outer suction chambers, and said device includes a switchover valve configured to switch off a suction air supply to said outer suction chambers. 
     
     
         9 . A rotary printing press or diecutter, comprising a device according to  claim 1 .