Heidelberger Druckmaschinen Ag

Ulf Delang

Martin Mayer

Manfred Schneider

Harald Bucher

Helmut Siegeritz

Heinrich Heidt

Bernd Utter

Friedrich Heuss

A method sets the inking in a printing press with multiple ink zones in an inking unit of a printing unit. The method includes: printing a test form onto a printing substrate with an intentional pre-defined color deviation from the intended target color; correcting the previously set ink setting and the defined set color deviation with regard to the respective target value in the wet condition of the printing substrate by a color measuring device; and taking color measurements of the dried printing substrate using the color measuring device. The measured color values established in the dry state and the original of the test form in a computer are compared. The ink setting that belongs to the ink zone with the smallest deviation from the intended target color is used as the target ink setting for the printing process.

Method for the automated definition of color test values

A method for correcting digitized image data in the prepress stage when using printing presses having a device-independent color profile in the main printing stage, having the following method steps:

Method for correcting unadjusted printing data on the basis of colormetrically measured reference sheet

A circuit configuration is provided for monitoring an electromagnetically actuated device, such as an electromagnetic clutch. The circuit comprises a switchable power source connected to the winding of the electromagnet; the power source supplies a composite voltage formed of a direct voltage part and a periodic alternating voltage part superimposed on one another. Engage and disengage signals are issued for the clutch and the direct voltage part assumes distinctly different levels in dependence on the engage and disengage signals. A precision resistor is connected in series with the winding of the electromagnet and a voltage sensor is connected at a node between the winding and the precision resistor. An evaluation circuit is connected to the voltage sensor for evaluating the alternating voltage part acting on the precision resistor and receiving therefrom information regarding the functionality of the electromagnetic device.

Circuit configuration for monitoring an electromagnetically actuated

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Walldorf, Germany

Ulf Delang