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

Abstract

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 (125A, 125B, 126A, 126B) provided integrally with right and left side lay devices (12A, 12B) 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 (12A) is used, a first left-hand end detector (125A) supported in the left-hand side lay device (12A) and a second right-hand end detector (126B) supported in the right-hand side lay device (12B) are actuated. When the right-hand side lay device (12B) is used, a first right-hand end detector (126A) supported in the right-hand side lay device (12B) and a second left-hand end detector (125B) supported in the left-hand side lay device (12A) are actuated.

Description

technical field [0001] The present invention relates to a detection method and a detection device for detecting a knuckle of a sheet-shaped article stopped by abutting against a front stop at the front end of a movement prevention plate in a sheet-fed printing machine. Background technique [0002] In the sheet-fed printing machine, the paper accumulated on the stacking table of the paper feeding device is sucked up one by one from the upper layer by the suction device, sent to the paper feeding board, and then sent to the anti-motion by the conveyor belt and the conveyor roller. board. Register and stop the paper in the vertical direction with the front gauge at the front end of the anti-movement plate, and register in the left and right direction with the side gauge device. The paper stopped when it hits the front stop is gripped by the grippers of the swing device and transported, and then printed while being handed over to the grippers of the impression cylinder of the ...

AI Technical Summary

Problems solved by technology

[0009] Therefore, it is considered that, as disclosed in Patent Document 2, a pair of side gauge devices are provided in the left and right directions at a position close to each detector, and the position in the left and right direction is automatically adjusted according to the size of the paper, and the detector is supported on the said detector. On the side gauge device, the left and right position of the detector is adjusted simultaneously with the side gauge device. However, since the side gauge device always uses only one of the pair, the other is located at an avoidance position that does not hinder the paper feeding to the printing unit. The corner of the paper on one side is not detected

Images