Paper pressing mechanism of printer

The utility model discloses a paper pressing mechanism of a printing machine, which comprises a conveying rack, a conveying belt and a driving mechanism for driving the conveying belt to rotate, an inverted U-shaped frame is arranged at the top of the conveying rack, and a threaded rod in the horizontal direction is arranged in an inner cavity of the frame. The threaded rod is in transmission connection with an output shaft of a motor fixed to the side wall of the frame, and two threaded sleeves are symmetrically screwed to the outer portion of the threaded rod. According to the paper pressingdevice, the frame is fixed to the top of the conveying rack, the threaded rod is arranged in the frame, the threaded sleeve is screwed on the outer portion of the threaded rod, the threaded sleeve ismovably connected with the paper pressing part through the connecting rod, and when the motor drives the threaded rod to rotate, the paper pressing part moves in the vertical direction; the height ofthe paper pressing part is