Heidelberger Druckmaschinen Ag

Gretag Aktiengesellschaft

Heidelberger Druckmaschinen Aktiegesellschaft

Gretag Atkiengesellschaft

Gretak Aktiengesellschaft

Helmut Kipphan

Gerhard Loffler

Anton Rodi

Hans Ott

Werner Huber

Wolfgang Geissler

Harald Bucher

Gerhard Fischer

Willi Jeschke

Bernd Kistler

Clemens Rensch

Gerhard Loeffler

Guido Keller

Josef Haase

Werner Joss

Peter T Blaser

Rainer Buschulte

Martin Schmitt-Lewen

Walter D'Heureuse

Jurgen Reithofer

Uwe Tessmann

Norbert Freyer

Gerd Laubmann

Rudolf-Karl Uhrig

Rolf Boegli

Werner L Giesa

Werner Ewendt

Tessmann Uwe

Ulrich Birch

Jean-Pierre Graf

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.

Printing machine and printing process

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. A sixth step of generating an OK signal when the desired value is reached. A seventh step of using the closed-loop control device for deriving further actual values representing inking of the printed image from the second picture signals and comparing the further actual values to further desired values for creating further resultant comparison values. Lastly, one determines further ink adjusting signals for controlling the ink distribution devices from the further resultant comparison values for varying inking of the printed product.

Method for regulating inking during printing operations of a printing

Process and arrangement for controlling or regulating operations carried

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. Color deviations due to different material properties and other error sources may also be equalized to some extent.

Process and apparatus for controlling the inking process in a printing

Device for parallel image inspection and inking control on a printed

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.

Method and device for determining the area coverage of an original

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.

Method of register regulation and printing control element for

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.

Ink-jet device and method of operation thereof

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.

Method of regulating dampening medium

Torque-measuring arrangement in a gear drive for transmitting a rotary

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.

Multiple drive for a sheet-fed rotary printing press

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 two substantially rectangular recesses, one of the substantially rectangular recesses having a contour corresponding to the outer contour of a printer receivable therein.

Holding unit for a measuring device

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. Color deviations due to different material properties and other error sources may also be equalized to some extent.

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.

Method and device for positioning a sensor device

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.

Color measurement system

Growing community of inventors

Schwetzingen, Germany

Helmut Kipphan