Plate clamp of printing machine

The utility model discloses a plate clamp for printing press, comprising the original plate clamp on printing press; wherein, in this utility model, a bottom plate is added, and the original plate clamp is divided into three short plate clamps; the base of the short plate clamp in the middle is fixed to the bottom plate with screws; the left and right short plate clamps are connected to the base of the short plate clamp in the middle via normal and reverse screw rods on their bases; the bases of the left and right short plate clamps have a elongated slot respectively; each of the elongated slots is provided with screws to fix the base of the short plate clamp to the bottom plate; in addition, a guiding and positioning mechanism is provided between the base of the left/right short plate clamp and the bottom plate. In the utility model, the position of the PS plate can be adjusted by moving the entire assembly; furthermore, the PS plate can be elongated by adjusting the clearance between the short clip plates slightly, so as to avoid ''corner distortion'' phenomenon on the print, and thereby improve printing quality.