Method and apparatus for detecting folded corner of sheet in sheet-fed printing press

摘要

A method and an apparatus for detecting a folded corner of a sheet in a sheet-fed printing press automatically select which of a pair of folded corner detectors provided integrally with right and left side lay devices should be used, in accordance with a setting of which of the side lay devices is to be used, thereby making it possible to raise the rate of operation and lightening the burden on an operator. When the left-hand side lay device is used, a first left-hand end detector supported in the left-hand side lay device and a second right-hand end detector supported in the right-hand side lay device are actuated. When the right-hand side lay device is used, a first right-hand end detector supported in the right-hand side lay device and a second left-hand end detector supported in the left-hand side lay device are actuated.