Method and apparatus for detecting skips in gravure printing

摘要

A method and apparatus for detecting skips in gravure prints including means for scanning an area of paper having gravure print thereon and generating output signals proportional to the amount of reflectivity of the area of the paper being scanned, stabilizing means for stabilizing the output signals to reduce the effects of signal drift, means for comparing the output signals from the stabilizing means with a reference signal level, filter means for passing a predetermined signal frequency band, pulse forming means electrically coupled to the filter means capable of generating a pulse in response to each filtered signal received, threshold means for activating the pulse forming means only when the filtered signals to the pulse forming means reach a predetermined signal level, and counter means for counting pulses generated by the pulse forming means.