| 摘要 |
<p>A pushing device is provided with an impression cylinder (56), sheet pusher (2) for pushing a rear end of printing sheet, drive chain (11) for driving the sheet pusher, and drive transmission mechanism (13) for transmitting the driving force used to rotate the impression cylinder to the drive chain. The drive transmission mechanism includes a clutch (22) which engages and disengages to permit and prohibit a transmission state of the drive transmission mechanism, clutch actuator (27) for actuating the clutch in accordance with a signal from a control unit (45), and drive device for rotating a drive shaft (38) for the drive chain (11). Accordingly, the position of the sheet pusher can be adjusted easily and properly according to a change in the size of the printing sheet, and a leading end of the printing sheet can be accurately positioned relative of holders provided on the impression cylinder. <IMAGE></p> |
