Process and device for determining the position and/or the shape of marks on printed-on paper webs

• US 20040055491A1
• Filed: 08/28/2003
• Published: 03/25/2004
• Est. Priority Date: 09/24/2002
• Status: Active Grant

• Current Assignee: Maschinenfabrik Wifag
• Original Assignee: Maschinenfabrik Wifag
• Inventors: Mengisen, Jean-Claude, Munz, Curt
• Granted Patent: US 6,880,458 B2
• Time in Patent Office: Days
• US Class Current: 101/485
• CPC Class Codes: B41F 33/0081 Devices for scanning register marks

Abstract

A process and device are provided for determining the position and/or the shape of at least one mark on a web to be printed on. The position and/or the shape of the at least one mark in the image to be printed is determined with the use of prepress data. The device for determining the position and/or the shape of at least one mark on a web to be printed on includes an input device for entering prepress data and a device for determining position data and/or shapes for a mark based on the prepress data entered.

Claims

1. A process for determining the position and/or the shape of at least one mark on a web to be printed on, the process comprising:

obtaining the image to be printed; and

determining the position and/or the shape of at least one registration mark in the image to be printed using the prepress data.

2. A process in accordance with claim 1, wherein the position and/or the shape of a plurality of marks and/or at least one mark field and/or at least one mark field white edge is determined with the use of the prepress data.

3. A process in accordance with claim 1, wherein the position data of the at least one mark or of the mark field are used to position at least one sensor.

4. A process in accordance with claim 1, wherein the position of at least one mark and/or of a mark field is used to determine the point in time of the detection of the mark by at least one sensor.

5. A process in accordance with claim 1, wherein the detected position of at least one mark and/or of a mark field is used to determine the reference position.

6. A process in accordance with claim 1, wherein position errors of at least one mark and/or of a mark field and/or of the white edge are determined.

7. A process in accordance with claim 6, wherein the degree of soiling of the sensors and/or the intensity of illumination are determined from a comparison of the prepress data with the data detected by sensors.

8. A process in accordance with claim 1, wherein an unambiguous assignment is established between marks and final control elements controlling print production using production data from a production planning computer, and determining the coordinates of the registration mark based on the production data.

9. A process in accordance with claim 8, wherein the production data includes one or more of web guiding data, plate coverage data and/or ink coverage data.

10. A device for determining the position and/or the shape of at least one mark on a web to be printed on, the device comprising:

an input device for entering prepress data; and

a device for determining position data and/or shapes for a mark based on the prepress data entered.

11. A device for checking the print quality with at least one sensor, the device comprising:

an input device for entering prepress data;

a device for determining position data and/or shapes for a mark based on the prepress data entered; and

a sensor positioned and/or actuated on the basis of position data determined.