Process and apparatus for exactly adjusting the beginning and end of reproducing in an engraving unit

摘要

Apparatus and method for exactly locating and adjusting the beginning and end of reproduction of an image pattern reproduced from a master picture attached to a rotating scanning cylinder which is reproduced on a rotating printing cylinder and wherein the adjustment is made by a circumferential pulse adjustment movable relative to a permanent circumferential mark in which process the image pattern is optoelectronically scanned, dot and image-line wise, to convert the image pattern into an electrical image signal and wherein the analog image signal is converted into a digital signal with the aid of a scanning pulse sequence device and the data obtained is stored into a memory after which the information is read from the memory with the aid of a recording pulse device and reconverted into an analog image signal and during the process of recording on the printing cylinder the timing of the recording pulse sequence train controls an engraving device and the movement of an engraving member, whereas the timing of the scanning pulse sequence train controls a scanning device and the movement of a scanning member. The movements are carried out in the axial direction of the cylinders.