Patent ID: 6722250
Filing Date: 2004-04-20
Classification: B23D,B26D,C03B,Y10T

Abstract:
A method for continuously cutting away of successive pieces or sections from a continuously moving endless material by flying cutting during travel of said endless material at a predetermined feed speed, said flying cutting being performed by a traveling cutting device accelerated for synchronization to said predetermined feed speed of the endless material and for cutting away said successive pieces or sections, said traveling cutting device comprising a cutting tool for scoring or cutting said endless material, said scoring or cutting being performed in a direction transverse to a motion direction of said endless material, said method comprising:a) moving the traveling cutting device in the motion direction of the continuously moving endless material with an electrically powered drive means; b) producing an electronic pre-control speed value for pre-controlling a travel speed of the traveling cutting device in an electronic drive controller to bring the travel speed of said traveling cutting device within a synchronization range of said feed speed of said endless material; c) mounting an image-taking device at a fixed, but adjustable, distance from said cutting tool in said motion direction of said endless material so that said image-taking device moves together with said traveling cutting device, said image-taking device having a window and a reference mark within said window, said reference mark having a width in the motion direction of the endless material corresponding to a tolerance range; d) selecting said fixed, but adjustable, distance so that said pieces or sections cut from said endless material are cut to predetermined lengths; e) when the travel speed of the traveling cutting device is within the synchronization range, imaging a front cut edge of the endless material with the image-taking device; f) then comparing an image of said front cut edge in said window with said reference mark; g) subsequently automatically controlling the travel speed of the traveling cutting device with an electronic speed control signal and according to a deviation of said image of said front cut edge from said reference mark; and h) when said image of said front cut edge is within said tolerance range of said reference mark, starting cutting by said traveling cutting device by activating said traveling cutting device with a start cutting signal from said image-taking device, whereby a next piece or section is cut from said endless material.