Abstract: An apparatus for feeding sheets from a stack to a machine that processes the sheets and a method of determining the vertical position of stacked sheets. The method enables the vertical position of the topmost sheet resting on the sheet stack to be determined using a sensor device. Ultrasonic pulses are applied to a longitudinal side of the sheet stack such that the pulses strike the longitudinal side of the stack at an angle, and the position of the upper edge of the stack is determined by means of an ultrasonic propagation time measurement.

Abstract: A method for detecting faults during transport of a web in a web-fed printing machine, wherein web speed is determined by contact-free measurement, in accordance with the Doppler principle, includes the steps of: by applying microwaves, determining a first local speed of the web at a first measurement position; by applying microwaves, determining at least a second local speed of the web at a second measurement position spaced apart from the first measurement position in a direction of web transport; determining an actual value from the first local speed and at least the second local speed; determining any deviation of the actual value from a predefined desired value; and comparing the deviation of the actual value from the predefined desired value with a predefined threshold; a detecting device for performing the method; and a printing machine including the detecting device.

Abstract: A device for separating or singling sheets, which have been piled up to form a stack, in a feeder of a sheet-processing machine, having a transport element with a guide edge, includes a device for matching the shape of the guide edge to the contour of the topmost sheet at a front side of the stack, as viewed in a sheet transport direction.

Abstract: A device for measuring the height of a sheet pile by using a reflectively operating radiation detector, a sheet separating device and a device for conveying separated sheets to a printing machine being assigned to the pile, comprising a system for measuring the propagation time of a radiation pulse originating from a radiation source and reflected at a sheet surface, the amplitude of the pulse being within a predefined range and lower than the amplitude of the reflection of the same radiation pulse at the surface of the sheet located closest to the radiation source, the radiation detector being connected to the measuring system.

Abstract: A method of controlling sheet feed to a sheet-processing machine, wherein sheets are separated from a pile, conveyed onto a table, brought individually into contact with alignment lays for leading edges of the sheets, and conveyed onward therefrom individually for processing in the machine, includes, upon misalignment of a sheet, generating a signal by ultrasonic detectors active in transmission operation, the ultrasonic detectors being fixedly disposed parallel to the alignment lays and including two ultrasonic transmitters arranged at a defined distance, and ultrasonic receivers associated therewith, maintaining over the area of a measuring window sonic energy flux originating from the ultrasonic transmitters, respectively, at a substantially constant sonic intensity in the conveying direction of the sheets, integrally detecting by the respective ultrasonic receiver the sonic energy passing through the measuring window, and simultaneously measuring a difference in the sonic energy measured by the ultrasonic

Abstract: An apparatus in a multicolor rotary printing machine for determining register deviations, including a scanning device disposed behind a print gap of a last printing unit of the printing machine; at least one register mark line disposed on printing material movably disposed relative to the scanning device, wherein the scanning device is directed to the register mark line; a control circuit connected with the scanning device for processing signals from the scanning device, and a measuring, steering and regulating device receiving inputs from the control circuit in operative engagement with registers of the printing machine, and a plurality of section reference marks on the printing material, in alignment with the register mark line within scanning range of the scanning device for correcting the register deviations.

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: 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: Register adjustment device in a sheet-fed printing press having adjusting elements for adjusting a printing operation thereof includes a position sensor, a light source for supplying light to the position sensor, and an evaluating unit connected to the position sensor for receiving data therefrom regarding registration of printing material traveling on a path through the printing press, and the evaluating unit being further connected to the adjusting elements of the printing press for adjusting a printing operation thereof in accordance with the data, the position sensor being disposed in the vicinity of the printing-material travel path so as to determine a respective register affecting the printing material, the position sensor having at least two sensor heads disposed at spaced distances from one another; and a method of register-adjustment.