Patent ID: 8613254

Claim:
A method for detection of occurrence of printing errors on printed substrates during processing thereof on a printing press, the method comprising: providing multiple sensors on functional components of the printing press to sense and monitor a behaviour of the printing press during processing of the printed substrates, which multiple sensors are designed to sense operational parameters of the functional components of the printing press, which operational parameters are representative of the behaviour of the printing press during processing of the printed substrates; and performing an in-line analysis of the behaviour of the printing press, apart from an in-line optical inspection of the printed substrates, to determine occurrence of a characteristic behaviour of the printing press which leads or is likely to lead to occurrence of printing errors on the printed substrates or which leads or is likely to lead to good printing quality of the printed substrates, wherein said in-line analysis of the behaviour of the printing press comprises: (a 0 ) modelling characteristic behaviours of the printing press using the operational parameters of the functional components of the printing press as representative parameters of said characteristic behaviours, said characteristic behaviours comprising: faulty or abnormal behaviours of the printing press that lead or are likely to lead to the occurrence of printing errors; and/or normal behaviours of the printing press that lead or are likely to lead to good printing quality of the printed substrates, (a 1 ) sensing the operational parameters of the functional components of the printing press during processing of the printed substrates on the printing press; and (a 2 ) determining whether the sensed operational parameters of the functional components of the printing press are indicative of a faulty or abnormal behaviour of the printing press which is likely to lead to printing errors, wherein said determination step (a 2 ) comprises: (a 21 ) monitoring the operational parameters of the functional components of the printing press during processing of the printed substrates on the printing press; and (a 22 ) determining whether the monitored operational parameters are indicative of any one of the modelled characteristic behaviours of the printing press.