Abstract: Sensor device for analyzing a surface structure includes a lighting device for emitting a focussed beam of light rays directed onto a surface, a radiation detector element for sensing light rays reflected from the surface, and an evaluating device for determining the surface structure from signals emitted by the light-ray detector element, a parameter T.sub.N for the surface structure being determinable by the evaluating device in accordance with a third moment of distribution of intensity of the reflected light rays in accordance with an equation: ##EQU1## wherein n represents a number of measuring points along a scattering indicatrix corresponding to the light rays reflected from the surface; P.sub.i is an initialized measuring signal according to an equation: ##EQU2## wherein I.sub.i is in the intensity of the light rays on a measuring point i; K represents a scaling factor; and M has a value determinable from values for i and P.sub.

Abstract: A three-color offset printing machine produces, during the printing of sheets, color measuring strips with several color measuring fields. A gray half-tone field produced by the overprinting of three colors serves as the reference field. The color location of the reference field is compared in a color deviation computer with the color location of a correlated desired reference field. From the color deviation, a layer thickness variation computer calculates a layer thickness variation control vector by means of a sensitivity matrix calculated on the basis of a linear model by a matrix computer. The matrix computer evaluates a series of secondary fields comprising three single color half-tone fields, three single color full-tone fields, three two-color full-tone fields, and a three-color full-tone field.

Abstract: A device for determining a register error in the case of a multi-color print made with a printing press includes a handheld housing containing a sight formed in a bottom surface of the housing; an optical system disposed at a distance from the sight and having an optical axis directed towards the sight; a mirror disposed between the optical system and the for deflecting light reflected from within the sight; a light-receiving unit disposed so as to be irradiated with the light deflected by the mirror; and an evaluation unit connected to the light-receiving unit for evaluating information from the light received by the light-receiving unit; a register mark to be measured by the device; and a method of operating the device.

Abstract: Multimachine operating system for remotely controlling printing machines including a central ink density measuring installation, and at least one terminal of a respective remote-control desk terminal electrically couplable to the ink density measuring installation, and a viewing screen terminal visually couplable to the control desk, the at least one terminal constituting one of a plurality thereof respectively assigned to a corresponding plurality of printing machines and couplable to the central ink density measuring installation.

Abstract: Device for determining a register error between individual colors in multicolor printing machine, comprising a photoelectric scanning apparatus for scanning differently colored register marks printed together on a printed sheet, an evaluation apparatus interacting with the scanning apparatus for determining the relative positions of the individual register marks, the scanning apparatus being disposed in a housing to be positioned at a given measuring location on the stationary printed sheet, the scanning apparatus comprising a scanning head movably disposed in the housing, and drive a device provided in the housing for producing the scanning movement of the scanning head relative to the printed sheet within a relatively small scanning region.

Abstract: A measuring device which is equipped with a number of sensors determines the area coverage of a printing original or printing plate for printing presses. Each individual sensor of the measuring device is calibrated with the air of calibration strips. By means of an additional sensor of the measuring device, a printing-plate and/or printing-original-specific correction calibration and an adjustment to identical values of all sensors are provided. The correction calibration and adjustment are performed by way of a calibration field and a calibration area on the printing plate and/or printing original.

Abstract: A measuring and/or color matching table having a sheet support surface, including a device for assessing printing quality of a printed sheet deposited on the sheet support surface, and a lighting fixture disposed above and spaced from the sheet support surface, the table having a front side from which the device is operable by an operator, a front part of the sheet supported surface facing towards the operator at the front side of the table and being inclined upwardly at an obtuse angle to a rear part of the sheet support surface.

Abstract: A method of colorimetrically evaluating a sheet printed on both sides thereof by means of a scanning densitometer having a mechanically controlled measuring head which is guided along a print control strip, to be evaluated and which produces a multiplicity of color density values representing color properties of the control strip, which includes assigning respective control strip measurement fields for different colors to respective printed parts on mutually opposite first form and perfector sides of a sheet, and forming a common control strip set out of all of the measurement fields, assigning to the measurement fields abbreviations for each of the respective ink colors in accordance with the colors to be printed, and introducing into a measuring system the color abbreviations assigned to the respective printing colors and to the respective sides of the sheet.

Abstract: On a measuring table (1), a bridge (2) extends over a printed sheet (5) to be measured. A measuring carriage (3) carrying a three color-simultaneous measuring head is arranged on the bridge (2) for linear movement in a back-and-forth manner along a desired path on the printed sheet. For control of the movement of the measuring head during measuring runs and for the evaluation of the measured data, a computer (7) with an integrated image display terminal and a processor system (6) controlled by the computer, is provided with the necessary interfaces. The analysis of a color measuring strip (MS) located along the desired path on the printed sheet is effected in two phases. In a first, so-called recognition run the measuring strip is scanned stepwise with high resolution in all three color channels, for the purpose of an analysis of its configuration. By means of flat locations in the density variations, effective positions (e.g.