Heidelberger Druckmaschinen Ag

Klaus Mueller

Anton Rodi

Thomas Wolf

Holger Leonhardt

Tobias Mueller

Bernhard Zintzen

Hartmut Keyl

A method is described of determining the distance () of a projection point () of a first imaging beam () of imaging device () from a measuring point () of a measuring device () or from a second projection point () of a second imaging beam () of a second imaging device () on the surface () of a printing form (), both the projection point () of the first imaging beam () and the measuring point () of the measuring device () or the second projection point () being movable in relation to the surface () of the printing form (). In the method, the reflected light intensity of at least a part of a pattern (), which is produced by the first imaging beam () on the printing form (), is measured as a function of the position of a measuring device (), so that the distance () may be formed as the difference of the position of the measuring device () and the correlated position of the imaging beam (), at which the imaging beam () was located when the part of the first pattern () was written. The method may advantageously be used in a method of correcting the time triggering of an imaging beam (), using which a projection point () may be produced on a surface () of a printing form ().

Method of determining the distance of projection points on the surface of a printing form

Register adjustment device in a sheet-fed printing press having adjusting elements for adjusting a printing operation thereof includes a position sensor, a light source for supplying light to the position sensor, and an evaluating unit connected to the position sensor for receiving data therefrom regarding registration of printing material traveling on a path through the printing press, and the evaluating unit being further connected to the adjusting elements of the printing press for adjusting a printing operation thereof in accordance with the data, the position sensor being disposed in the vicinity of the printing-material travel path so as to determine a respective register affecting the printing material, the position sensor having at least two sensor heads disposed at spaced distances from one another; and a method of register-adjustment.

Device for register adjustment on a sheet-fed printing press

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Heidelberg, Germany

Klaus Mueller