Abstract: A printing-material transport system for a printing machine, having at least one printing-material guide surface and a device for producing an air cushion between the guide surface and the printing material, comprising at least one sensor arrangement for registering the spaced distance between the printing material and the guide surface, and a control device for controlling the thickness of the air cushion, based upon the registered distance, so that the spaced distance registered by the sensor arrangement comes to lie within a desired range.

Abstract: A method of aligning sheets prior to transferring them to a sheet-processing machine includes feeding a respective sheet, by a first sheet edge thereof, against a stop; gripping the sheet by at least one sheet holder, and displacing the sheet holder at least approximately transversely to the stop in a direction towards a first control region; and onwardly moving the sheet holder, while the sheet is held thereby, over a given first distance, after a second sheet edge has reached the first control region; and a device for performing the method.

Abstract: A method for detecting the position of stacked flat material wherein at least one light beam is directed onto a side of a pile of the flat material, is reflected therefrom and is evaluated as a measure of the position, includes directing the at least one light beam not only onto the side of the flat material pile, but also onto a region above a top edge of the pile, and utilizing regions with reflection and without reflection from the pile side for determining the position of the top edge of the pile; and a device for performing the foregoing method.

Abstract: A sheet sensor arrangement for a sheet printing machine and particularly for a turning device of a sheet printing machine, which comprises at least one hollow cylindrical drum (3; 4), which has a gripper system to transport and/or temporarily store individual sheets (5). A sensor arrangement which is not very susceptible to contamination and has a mechanically simple structure is comprised of the fact that the cylindrical wall of the drum (3; 4) has at least one opening which allows light to pass through, and that a sheet sensor is formed by a light barrier (9, 10, 11), which has a light beam which, in at least one angle position of the drum, is directed from the inside at the opening which allows light to pass through. In addition, a corresponding process for optical monitoring of sheets in a sheet printing machine is indicated.

Abstract: Device for laterally aligning sheets in a feeder of a sheet-fed rotary printing press wherein sheets having respective leading edges aligned at front lays of a feeder table are gripped by a gripper system of a pregripper in succession individually at an edge region thereof, and transferred with a swivelling or revolving movement to a gripper system of a revolvingly driven feed cylinder, includes motorized adjustment elements for laterally displacing at least one of the gripper systems transversely to sheet travel through the printing press, measuring elements for determining an actual position of a side edge of a respective sheet on the feeder table, and a setpoint- actual value comparator for comparing a setpoint position of the side edge of the respective sheet on the feeder table with the actual position of the side edge determined by the measuring elements, and for generating pulses for controlling the measuring elements in accordance with the comparison.

Abstract: A sheet sensor device for a sheet-fed printing press having a sheet-reversing arrangement, said sheet-reversing arrangement being comprised essentially of a storage drum, a reversing drum and gripper systems mounted on these drums, so that a sheet sensor device comprising a transmitter and a receiver is arranged in the sheet-reversing area formed between the storage drum and the reversing drum, and that the transmitter is arranged on the one side of the printing machine, and the receiver is arranged on the other side of the printing machine, outside of the sheet-travel area.

Abstract: Contact-free double-sheet control device for a printing press having a capacitively-operating measuring sensor for determining sheet count, a counter-electrode adjacent thereto, and an evaluation circuit connected to the sensor, includes an eddy-current measuring sensor assigned to the capacitive measuring circuit for compensating for operating influences.