Abstract: An apparatus for carrying or guiding a printing material sheet on an air cushion between a nozzle surface and the printing material sheet. The apparatus has first nozzle pairs which are arranged in a first row and second nozzle pairs which are arranged in a second row for generating the air cushion. The first nozzle pairs and the second nozzle pairs in each case have a blower nozzle and a suction nozzle, which are paired in such a way that one and the same air flow is blown out by the respective blower nozzle and is aspirated, at least predominantly, by the suction nozzle that is paired with the blower nozzle. The suction nozzles of the first nozzle pairs are arranged in such a way between the blower nozzles of the second nozzle pairs and the suction nozzles of the second nozzle pairs such that the air flows of the second nozzle pairs flow past the suction nozzles of the first nozzle pairs.
Abstract: The invention relates to a process for the production of structured retaining areas on sheet grippers, sheet gripper supports or similar gripper facilities for machines for handling and processing sheets by the formation of a non-etchable dot structure on the base member and the subsequent etching out of intervening areas. To provide structured retaining areas having a smoothly shaped surface, the dot structure is produced by screen printing or pressure pad printing and after the etching-out of unprinted areas, a hard smoothing coating, preferably of chromium or ceramic, is applied to the structural retaining area.
Abstract: A sheet gripper for the delivery system of a printing machine or the like includes a clamp member adapted to be secured on a pivotable gripper shaft, and a gripper finger mounted resiliently on the clamp member and adapted to be brought into contact with a sheet to be gripped during pivoting of the gripper shaft. The clamp member is made of two sheet-metal parts and includes a base member and a bottom part, which are adapted to be hooked into engagement with one another on one side of the shaft and connected together by a mounting screw on the other side of the shaft to secure the clamp member on the gripper shaft. The gripper finger is also secured on the base member at one end by means of the mounting screw and is adjustable by means of a set screw threadably received in the base member approximately at the other end thereof.
Abstract: A plurality of adjustment screws are supported on an adjusting device mounted in a recess in the outer periphery of a cylinder of a sheet-fed rotary printing press, and threadedly extend through an adjustment bar extending axially of the cylinder. A gripper pad bar on which gripper pads are mounted is disposed radially outwardly of the adjustment bar in contact therewith. The gripper pad bar and the adjustment bar are held against each other through their contact surfaces which are complementarily slanted. Rotatable movement of the adjusting screws causes the adjustment bar to displace the gripper pad bar radially outwardly or inwardly for stepless adjustment of the height of the gripper pads in conformity with the thickness of a sheet of paper without having to remove the gripper pad bar and other parts.