Method of monitoring the wear on printing forms in a printing machine

摘要

The wear on printing forms in a printing machine is monitored in that the inking values at certain locations on the printed product are measured. At least two measurement locations are defined on the print image. The first measurement location has a defined tonal value above an upper tonal value, and the second measurement location has a tonal value below a lower tonal value. The printed product is scanned as it leaves the printing unit. The measured inking values at the measurement locations are compared with the setpoint values as defined by the tonal values at the defined locations. If the lower tone signal is below the setpoint signal while the upper tone signal corresponds or exceeds the setpoint inking values, the control unit deduces that the printing plate may be worn. The printed product count may be used as auxiliary information in the wear determination.