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US 2006/0140686 A1Published application
Method of determining color register and/or register errors in a printing machine
AssigneeHeidelberger Druckmaschinen AG
InventorsRolf Spilz, Volker Otto
Life of this patent
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Abstract
Color register and/or register errors are detected in a printing machine by using triangles serving as register marks. A first triangle is printed onto a sheet near the leading edge and a second triangle is printed onto a sheet near its trailing edge. The first triangle and the second triangle are detected by a sensor and a displacement of the sheet at right angles to the travel direction of the sheet and/or an angular displacement of the sheet is/are determined.
Claims7
A method of determining register errors in a printing machine, the method which comprises:
- printing at least one first triangle near a leading edge of a sheet;
- printing at least one second triangle near a trailing edge of the sheet;
- detecting the first triangle and the second triangle with a sensor;
- deducing, from a location of the first triangle and the second triangle detected by the sensor, a displacement of the sheet transversely to a direction of travel of the sheet through the printing machine and/or an angular displacement of the sheet.
1 more element
Dependencies are inferred from the claim text.