Device for engraving of cups into printing cylinders by means of laser light
In a device for engraving of cups into a rotating printing cylinder for rotogravure, at least one laser light source with which laser light for formation of the cups is directed onto the rotating printing cylinder. A metal removal element is arranged in a region of an impingement location of the laser light on the printing cylinder to form the cups such that a melt accumulation of material of the printing cylinder which forms a burr at the cups created by the impingement of the laser light is removed substantially continuously and substantially immediately after its creation with the removal element.
1 . A device for engraving of cups into a rotary printing cylinder for rotogravure, comprising:
at least one laser light source with which laser light for formation of the cups is directed onto the rotary printing cylinder, an output unit of the laser light source being movable along the printing cylinder in an axial direction of the printing cylinder by a respective predetermined amount for a complete rotation of the printing cylinder; and
a metal removal element arranged in a region of an impingement location of the laser light on the printing cylinder to form the cups such that a melt accumulation of material of the printing cylinder which forms a burr at the cups created by the impingement of the laser light is removed substantially continuously and substantially immediately after its creation with said removal element.
2 . A device according to claim 1 wherein the metal removal element is arranged immediately in a region of the impingement location of the laser light on the printing cylinder, following in a rotation direction of the printing cylinder.
3 . A device according to claim 1 wherein at least the laser light source and the output unit of the laser light are moved in combination along the printing cylinder in its axial direction.
4 . A device according to claim 3 wherein at least the output unit of the laser light and the laser light source are combined into one unit.
5 . A device according to claim 1 wherein the metal removal element is moved along the printing cylinder, coupled in terms of actuation with at least the output unit of the laser light.
6 . A device according to claim 1 wherein the metal removal element is designed in the form of a scraper at its end directed towards the printing cylinder.
7 . A device according to claim 1 wherein the metal removal element is controlled for application on the printing cylinder and is moveable away therefrom.
8 . A device according to claim 1 wherein the metal removal element is supported via a support element such that it glides on a surface of the printing cylinder.
9 . A device according to claim 8 wherein the support element comprises a support surface comprised of diamond.
10 . A device according to claim 1 wherein the metal removal element is designed in the form of an abrasion element.
11 . A device according to claim 1 wherein at least a region of the surface of the printing cylinder in which the cups are formed is comprised of a metallic material.
12 . A device according to claim 11 wherein the metallic material comprises copper.
13 . A device according to claim 11 wherein the metallic material comprises chromium.
14 . A device according to claim 11 wherein the metallic material comprises zinc.
15 . A device for engraving of cups into a rotary printing cylinder for rotogravure, comprising:
at least one laser light source with which laser light for formation of the cups is directed onto the rotary printing cylinder, an output unit of the laser light source being constantly moved along the printing cylinder in an axial direction of the printing cylinder dependent on a rotation of the printing cylinder and is moved by a respective predetermined amount in said axial direction after completion of a complete rotation of the printing cylinder; and
a metal removal element arranged in a region of an impingement location of the laser light on the printing cylinder to form the cups such that a melt accumulation of material of the printing cylinder which forms a burr at the cups created by the impingement of the laser light is removed substantially continuously and substantially immediately after its creation with said removal element.
16 . A device for engraving of cups into a rotary printing cylinder for rotogravure, comprising:
at least one laser light source with which laser light for formation of the cups is directed onto the rotary printing cylinder, an output unit of the laser light source being moveable along the printing cylinder in an axial direction of the printing cylinder; and
a metal removal element arranged in a region of an impingement location of the laser light on the printing cylinder to form the cups such that a melt accumulation of material of the printing cylinder which forms a burr at the cups created by the impingement of the laser light is removed substantially continuously after its creation with said removal element.