Man Roland Druckmaschinen Ag

Arno Wuhrl

Oded Zingher

Werner Kistner

Gunter Ziesing

Ullrich Behrendt

Stephan Suppes

Ralf Schafer

Manfred Stibaner

A device for stacking selected sheets in an offset manner so as to facilitate print quality measurements. Certain sheets are automatically or manually selected to be offset deposited onto a stack of sheets so that an edge of the selected sheet including a number of printed measuring fields extends beyond other sheets in the stack. A measuring head transversely scans the measuring fields of the selected sheet for print quality measurements while subsequent sheets are stacked in the ordinary manner. Since subsequent sheets do not cover the extending edge of the selected sheet, sufficient time is provided to complete the scanning operation with a single measuring head without interrupting or slowing the normal stacking rate.

Offset sheet-stacking method and apparatus for facilitating print

A quality control system for a printing plant adapted to efficiently and accurately correlate information needed for printing quality control, which information had required at least an element of human mental correlation in the past. A printing console has a video camera aimed at a printed sheet on the console, a light source having a position related to that of the video camera, measuring devices such as scanners for measuring particular areas of the printed sheet, and control keys for zonal press controls such as control of zonal ink supply. A processor is associated with an image memory adapted to create an electronic image of the printed sheet on the table. The processor also has access to a reference memory in which is stored a further representation of the image along with coordinates for quality control zones. The processor correlates the image created by the video camera with the reference image in order to associate the quality control zones from the reference image with the actual sample on the table. The processor then operates a display device with respect to the actual sample on the table.

Apparatus for carrying out the comprehensive quality control of printed

A control system for a printing plant comprising a central computer and a plurality of substantially identical peripheral computers. The central computer has a memory including a table defining the functions of each peripheral computer. The table is transmitted for storage in definition memories of the peripheral computers. The table includes a list of allowed or non-allowed interface units for each of the peripheral computers. Each of the peripheral computers includes an array of connectors for interfacing with auxiliary equipment. Each peripheral computer is capable of polling the busy or non-busy status of each connector and utilizing that information in conjunction with information in the definition memory to determine the functions assigned to it. The system allows commonality of data in that the central computer defines the requirements for each of the peripheral computers, yet prevents overlap of function by assuring that an assigned peripheral unit can effect only the portion of the printing operation (via connected interface units) which is assigned to that particular device.

Control system for a printing plant

A system and associated method for low cost image scanning and automatic ink adjustment control in a printing press. The system dispenses with automatically positioned densitometers and the system feedback which associates densitometer position with ink adjusters in the press. Instead, at the outset, image zones in a printed form are associated with ink zones on the press, as determined by the particular form being printed. The operator is then led to take manual densitometer readings of each image zone, and the system determines whether the reading is proper, whether it is within standards, and if the operator should advance to a reading of the next zone, so directs the operator.

Sensor based inking control for a printing press

A multi-position proximity switch having a plurality of binary outputs, each output indicating whether the distance between an object and a field transducer exceeds a corresponding one of a plurality of predefined distances. The sensitivity of a proximity detector having a single binary output is stepped through a plurality of adjustable levels by a digital counter having decoded outputs and the binary output of the proximity switch is sampled after the decoded counter outputs change state so that a plurality of binary outputs, each associated with a detector sensitivity level and a corresponding distance, are provided. The failure of the greatest distance to be detected or the detection of the smallest distance activates an alarm indicating that the object is outside a permissible range of distances.

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Muhlheim/Main, Germany

Arno Wuhrl