machine for the automatic control of qualita'on banknotes and cartevalori fresh printing

摘要

The machine comprises a control head pair 4, 6, e.g. photoelectric heads, being effective to examine single sheets (bank notes) at high speed e.g. held on a suction smoother cylinders 3, 5. The head pair scans the front and rear surfaces of the sheet along a plurality of paths. The signal is compared with a signal representing a sample or reference sheet. By this comparison any defect, e.g. in ink tones, generates a reject signal to actuate a downstream printing mechanism 7 which impresses a suitable cancellation mark on the defective note. Further devices 8 detect faults in the filigree pattern. The sheets are ultimately delivered to box 9, 10 or 11 according to the defects sensed. IMAGE