| 摘要 |
PURPOSE:To automatically detect a block winding error at block supplying time by providing detecting means for detecting the erroneous winding by detecting the rotating position of a block tail grasping member after a printing block is completely mounted. CONSTITUTION:A block grasping and displacement detecting mechanism consisting of a mark member 375 and a photoelectric sensor 376 is provided at the left side of a plate cylinder 3. According to this mechanism, when the block tail is normally held by a block tail hook, the sensor 276 does not detect the member 375 and the sensor 376 detects the member 375 only when displacing the block or failing to grasp the block tail. Accordingly, the erroneous winding of the block such as the block displacement or the erroneous grasp of the block can be automatically detected on the basis of the output of the sensor 376. |
