Arrangement to detect register marks for positioning of register mark detector in multi-color printing machine

摘要

Position (x) of receiver (3) to track (16) of register marks (17) in movement direction (2) is determined using positioning mark (21) having edge lying at slant to track and at right angle to track. Mark width is multiple of register mark width and has predetermined position relationship to track. Positioning mark (21) is right angled triangle with cathetus (26) lying flush with midline (27) of track. Determines position (x) of receiver (3) to track (16) of register marks (17) in movement direction (2), using positioning mark (21) having edge lying at slant to track and at right angle to track. Mark width is multiple of register mark width and has predetermined position relationship to track. Receiver scans register marks along track and device positions receiver orthogonal to track. Positioning mark (21) is right angled triangle with cathetus (26) lying flush with midline (27) of track.