Device for activating suction-air control elements

摘要

The invention relates to a device for activating suction-air control elements for suckers in reversing drums of sheet-fed rotary printing machines, in which the sheet can be printed either by single-sided printing or by face and back printing, and the sheet is turned, in face and back printing, in accordance with the principle of sheet trailing-edge reversal using suckers, and provision is made for means for switching on and off the suction-air control when changing the mode of operation. The object of the invention of providing a device for activating suction-air control elements for suckers in reversing drums, which becomes effective upon switching on the suction air without additional handling, is achieved in that a pneumatically activatable operating cylinder (24), which is assigned to suction-air control elements (8, 12, 10, 11, 22) and can be actuated, and the control valve (10) of the suction-air control elements (8, 12, 10, 11, 22) are assigned to a common vacuum generator (28) (Figure 2). <IMAGE>