| 摘要 |
An apparatus for destacking a stack of flexible flat structures, especially paper sheets or printed products, comprising a suction head which can be moved, by means of a drive device, along a closed path of travel. This suction head is periodically connected, by means of a valve arrangement, with a source of negative pressure, and thereafter is again disconnected from such source. This valve arrangement comprises a cylindrical valve body attached to a drive shaft of the drive device for the suction head. This valve body rotates in a valve housing having three housing connections which, viewed in the direction of rotation of the valve body, are arranged behind one another. The forwardmost housing connection, viewed in such rotational direction, is connected with the negative pressure source, whereas the intermediate housing connection is connected with the suction head. The last housing connection serves for venting and is connected with the surroundings. |
