Automatic alignment of print carrier esp. for colour printing press - printing alignment accuracy reference marks in colour and black and evaluating their separation to determine alignment errors for other colours

摘要

The method of automatically aligning a print carrier involves printing at least two matching accuracy marks as non-black reference marks on the carrier. The distance between the marks is used as a reference value to detect alignment errors for other colours. At least two additional black marks can be printed and their distance used as a further reference value for determining alignment errors for other colours. The alignment is performed automatically by an alignment unit using image signals and a data transfer device. ADVANTAGE - Can automatically align alignment markings with great accuracy.