Abstract: A printing machine includes a printing form, an optical imaging unit for directly imaging the printing form, and an inking unit for inking the printing form, the printing form having a surface formed of a material with wetting properties reversibly changeable between a state with a very small contact angle and a state with a relatively large contact angle, the state with a small contact angle being achievable by action of light having a wavelength shorter than a material-specific wavelength, and a cleaning device for cleaning the surface of the printing form; and a printing process performed with the printing machine.

Abstract: A method for regulating inking of a printing press. The method includes a first step of providing a picture taking device, a closed-loop control device, and a printed product having a surface with a printed image. A second step of printing a print control strip on the surface next to the printed image. A third step of deriving first picture signals from the print control strip and deriving second picture signals from the printed image with the picture taking device. A fourth step of using the closed-loop control device for deriving actual values representing inking of the print control strip from the first picture signals and comparing the actual values to desired values for deriving resultant comparison values. A fifth step of determining ink adjusting signals for controlling ink distribution devices from the resultant comparison values for varying inking of the print product until a desired value is reached during a printer tuning phase.

Abstract: A process and arrangement are disclosed for controlling or regulating operations carried out by a printing machine.

Abstract: To improve the control of the inking process in an offset printing machine, color measuring fields provided on printed sheets are evaluated not as heretofore densitometrically but colorimetrically by means of spectral measurements. Spectral reflections are used to match colors, or color coordinates are calculated from them and compared with corresponding set reflections or set color coordinates. The color deviations obtained in this manner are used to control the inking process. For the stabilization of printing runs the spectral reflections are converted into filter color densities and the inking process is controlled on the basis of these color densities in a conventional manner. The control of the inking process using color deviations and control using color density may be superposed upon each other.The process makes it possible to adapt color impressions in delicate locations of importance for the image in the print to the corresponding locations of the proof.

Abstract: The invention relates to a device for inspecting the image and measuring the color of at least one printed product produced by a printing machine with at least one printing group. The purpose of the present invention is to teach a device permitting the quality and color of printed products to be assessed. To do this, the device consists of at least one imaging device providing the image data of the printed product and a computer device, in which the computer device detects all the image data of the printed products for image inspection and determines a measurement color assessment from the image data of at least one measuring point of the printed product.

Abstract: A method of determining area coverage of a printing original having printing areas and non-printing areas thereon, the printing areas being of a different color than that of the non-printing areas, the printing original having a location-dependent inhomogeneity independent of the area coverage, including optically scanning the original for determining a local diffuse reflection of a measured measuring field, the measuring result of the optical scanning being influenced by the inhomogeneity; determining at least two diffuse-reflection values from each measuring field, the diffuse-reflection values differing spectrally from one another in accordance with the color difference; and evaluating the two diffuse-reflection values and separating a component of the measuring result which is influenced by the area coverage, and a component of the measuring result which is influenced by the inhomogeneity; and the device thereof.

Abstract: Printing control element for detecting color register deviations in a defined direction, the printing control element being disposed in a selected region on a printed product produced by a printing press and scannable by a single opto-electronic sensor device, includes a plurality of equidistant geometric figures disposed adjacent one another in a row without gaps therebetween in the defined direction when a print is in-register, every third one of the adjacent geometric figures being in a set color and, respectively, in the defined direction, one of the geometric figures in another color being disposed adjoining the third geometric figure; and a method of regulating color register.

Abstract: Ink-jet device for producing an image on a recording medium includes a droplet-producing device for ejecting droplets along a trajectory, and a droplet-controlling device for controlling the trajectory of the droplets, the droplet-controlling device being formed as a deflection surface, the deflection surface being disposed so that respective droplets impact thereon and rebound to continue the flight thereof, the respective droplets being splittable into at least two subdroplets as a function of selected parameters, and ink-jet process.

Abstract: Method of regulating an amount of dampening medium on a printing plate of an offset printing machine, includes determining the amount of dampening medium on the printing plate, adjusting the rotational speed of a dampening ductor and/or the like to a given set value so as to regulate the amount of dampening medium on the printing plate and, for regulation deviations wherein the set value is greater than an actual value, driving a controller with a greater amplification factor than for regulation deviations wherein the set value is smaller than the actual value.

Abstract: The purpose of the invention is to develop a torque measuring device with measuring points only at one place on the measuring shaft and which is highly sensitive in a given rotation speed range. According to the invention, in a torque measuring arrangement for a gear drive with at least three meshing helically toothed spur pinions, at least one fixed distance sensor on at least one of the pinions is directed towards a plane surface of the pinion which is connected to an evaluation device. The invention is applicable to all gear drives which transfer the power via helical gears.

Abstract: Multiple drive for a sheet-fed rotary printing press having in-line printing units with drive gears driven via a closed gear train, the gear train connecting the printing units to one another and having two power-branching, interdependently controlled power-input locations includes two electric motors connected to said two power-input locations, respectively, at each one of two printing units, which have a third printing unit disposed therebetween, for driving the two printing units with directionally constant power flows of a divided and interdependently controlled driving power of the two electric motors meeting in the third printing unit disposed between the two driven printing units.

Abstract: A holding unit for a measuring device having a base carrying an inductive charging input, and a side wall formed with openings for infrared data transmission, includes a two-step cover surface including an upper cover surface and a lower cover surface, the lower cover surface being formed with a recess having a contour corresponding to the contour of the measuring device for receiving the measuring device therein, a side wall of the holding unit partly defining the recess formed in the lower cover surface and being formed with openings for infrared data transmission coinciding with the openings for infrared data transmission formed in the side wall of the measuring device when the measuring device is received in the recess, an output for an inductive power supply disposed in a base of the recess formed in the lower cover surface, the output coinciding with the inductive charging input carried by the measuring device when the measuring device is received in the recess, the upper cover surface being formed with

Abstract: To improve the control of the inking process in an offset printing machine, color measuring fields provided on printed sheets are evaluated not as heretofore densitometrically but colorimetrically by means of spectral measurements. Spectral reflections are used to match colors, or color coordinates are calculated from them and compared with corresponding set reflections or set color coordinates. The color deviations obtained in this manner are used to control the inking process. For the stabilization of printing runs the spectral reflections are converted into filter color densities and the inking process is controlled on the basis of these color densities in a conventional manner. The control of the inking process using color deviations and control using color denisty may be superposed upon each other. The process makes it possible to adapt color impressions in delicate locations of importance for the image in the print to the corresponding locations of the proof.

Abstract: A method of positioning a measuring field of a sensor device on a selected region of an outer cylindrical surface of a cylinder in a rotary printing press, includes directing a light spot of a pilot light source into the selected region; storing the position of the light spot on the outer cylindrical surface of the cylinder in a computing/control device; and controlling the sensor device so that it supplies measured data from the selected region, and a device for performing the method.

Abstract: Color measurement system for offset printing, having a bridge for spanning an original which is to be measured and a color-measuring device movably disposed on the bridge, the color-measuring device comprising a first three-color simultaneous measuring head for densitometric measurement, and a second three-color simultaneous measuring head for colorimetric measurement.

Abstract: A method of establishing a measuring location lying in an ink-free area for determining the thickness of a layer of dampening medium on the surface of an offset printing plate, which includes scanning the surface of the plate in a search run with a measuring head, and evaluating the thus obtained measurement data in a manner that a measuring location lies in a vertical zone of the offset printing plate with the smallest possible average area coverage, and a device for performing the method.

Abstract: A method of monitoring dampening-medium feed in an offset printing machine includes scanning non-printed areas in a region of given inked areas by a device of an opto-electric transducer, and evaluating signals generated by the scanning; and a device for performing the foregoing method.

Abstract: A method of determining printing-ink consumption in an offset printing press includes feeding printing ink to an inking unit of a printing press via an ink duct having adjustable ink-gap openings, and via an ink-duct roller which absorbs the ink emerging from the ink-gap openings; determining ink-film thicknesses (s.sub.F) from the ink-gap openings, and ink-strip length (l.sub.F) and ink-strip width (b.sub.F) per unit time from the rotational speed of the ink-duct roller, and calculating therewith the quantity of printing ink supplied per unit time of per number of printed products in accordance with the equationM.sub.F =K.times.s.sub.F .times.l.sub.F .times.b.sub.F .times.fwherein K represents a constant specific to the printing-press and f represents both a function specific to an adjustment of the press and also a function specific to the material, and displaying the determined ink consumption.

Abstract: Assembly for influencing inking in printing machines including a color density measuring device, a device for comparing nominal values and actual measured values, at least one electronic computer for linking the measured values with adjustment values, devices for metering ink feed zonewise to a printing plate and having ink metering elements with appertaining adjustment members and feed-back or reply devices, including a plurality of displays assigned to the ink metering elements for representing adjustment values of all ink zone adjustment members, respectively, of a printing unit, said displays providing exact recommendations to an operator of the assembly, before adjustment of the inking zone adjustment members, for adjusting the adjustment members to predetermined positioning nominal values and signaling to the operator absolute adjustment travel thereof both in magnitude and direction and a positioning device having means selective by the operator for following up the ink zone adjustment members individu

Abstract: A method of setting the starting time of transverse ink distribution for printing machines, which comprises determining impression-area dispersion on a printing plate and, in conjunction with parameters specific to the printing machine which affect ink dispersion on a printed sheet, calculating an optimum starting time of transverse ink distribution.