Determination of the register error in multi-colour printing

Details Determination of the register error in multi-colour printing Determination of the register error in multi-colour printing

G - Physics

01

N

73/51

G01N 21/84 (2006.01) B41F 13/02 (2006.01) B41F 33/00 (2006.01)

Patent

CA 1300921

9-15840/GTF 505 Determination of the reqister error in multi-colour printing Abstract To determine the register error in multi-colour printing, a specially deslgned hand-held measuring device, used in off-line mode, is placed on the printed sheet ln the region of special register marks. The hand-held device then scans the register mark photoelectrically and calculates the register error. Scanning is performed circularly or linearly by means of a rotatlng or a reciprocating scanning head, respectively. To increase the precision and measuring reliability, special, basically angular, register marks are provided and the scanning apparatus is specially tailored to the particular shape of the register marks. (Fig. 1)

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