Paper sheet feed for printing machine - avoids damaging paper edges by using computer to control movable paper stop and movable paper trap

摘要

A device taking a sample sheet or a non-stop auxiliary stacking device is operates. A sheet trap can be inserted into the sheet deposition path. A movable stop is provided for the front edge of a sheet. A control (25) activated the sheet trap and/or the sheet stop (19) depending on a certain parameter of the printing machine. The sheet trap is actuated independently of the sheet stop. Actuation is accomplished usign a comptuer (26)., The certain parameter may be the printing machines speed, ther opening of the sheet transport grip, the speed of a suction rolelr (16) in the sheet transport device, the magnitude this suction, the paper thickness, the reaction time, and/or one or more of many other variables.