Patent ID: 8733249

Claim:
A web printing press comprising: a printing unit for printing a web; a dryer located downstream of the printing unit, the dryer configured and arranged to dry the web; a folder located downstream of the dryer, the folder configured and arranged to cut the web and to fold the cut web into printed products, the web and printed products defining a printed product stream; a waste gate located downstream of the folder, the waste gate configured and arranged to discard unacceptable printed products; a color density sensor located downstream of the printing unit and upstream of the dryer, the color density sensor configured and arranged to sense a color density of the web; a first light indicator indicating in real-time a print defect in the web as a function of the color density sensor, the light indicator being located downstream of the printing unit, upstream of the dryer, and adjacent the web; a cutoff sensor located downstream of the folder and upstream of the waste gate, the cut off sensor configured and arranged to sense a cutoff of the printed products; a second light indicator indicating in real-time a print defect in one the printing products passing the cutoff sensor as a function of the cutoff sensor, the second light indicator being located downstream of the folder, upstream of the waste gate, and adjacent the printed products of the product stream; a controller connected to the color density sensor and the cutoff sensor; a graphic user interface separate from the first and second light indicators, the graphic user interface connected to the controller, the graphic user interface configured to graphically display a location in the printed product stream of each print defect indicated by the first and second light indicators.