Rotary printing machine paper folding device

The rotary printer includes a counter roller consisting of a knife roller and a slot roller.
The utility model is characterized in that two grooves are arranged symmetrically at an angle of 180 degrees in the axial direction on the upper surface of the knife roller; two grooves are respectively provided with an indentation blade holder and a paper-separate blade holder which can slide up and down in the groove, and the two blade holders are Separately equipped with a paper knife and an indentation knife, a tension spring is connected at both ends of the knife holder to expose the knife roll, and each end of each knife holder is also provided with a roller respectively, and cooperates with the roller to make the slitting knife and the indentation knife cycle. Moving up and down is an eccentric cam fixed on the frame. This kind of rotary printing press split sheet folding device can press accurate folding line in the center of the paper, and the folding is convenient and tidy.