Method and device for measuring a position of a passing sheet

US6845288B2 · kind B2 · utility

Assignees

• Heidelberger Druckmaschinen AG · DE
• NexPress Solutions LLC · US

Inventors

• Frank Pierel · Kiel, DE
• Helmut Buck · Schriesheim, DE
• Carsten Huschle · Bretten, DE

Key dates

• Filing date: Apr 15, 2002
• Grant date: Jan 18, 2005
• Expiry date: Dec 2, 2022

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B65H2701/1322
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

The position of sheets in a printing press is measured. A problem in transporting sheets through the printing press is how to guarantee the correct orientation and lay of the sheets, which must be guaranteed particularly in the printing operation. There is provided a device for precisely determining and correcting the positions of sheets in printing presses. Margin regions of a sheet are respectively imaged, projection data are transmitted to a computing unit, and the position of the sheet is calculated with the aid of the projection data by way of an image recognition algorithm. Furthermore, the computed positions of the sheet are compared to positions which are stored in the computing unit, and from the comparison, position deviations are computed, which are transmitted to the printing press and corrected by way of a sheet registration device.