When printing a book cover or trademark with a large plate area and a large amount of ink when printing with a D400 type automatic four-stage automatic printer, there is no ink stickiness due to large printing pressure, and some sheets may have irregularities in the imprinting process. The slippage phenomenon has caused overprinting. If the quality of the product is affected, the product will be scrapped. In order to avoid this, to correctly grasp the pad, 2 with the ink viscosity, it is important to master the adjustment of the machine. Only in this way can the suburbs prevent the positioning of printed sheets from being inaccurate. After the sheet is positioned, due to the pulling force in the imprinting, the sheet slides in the case where the clamping force of the sheet clamp is insufficient, so that the sheet and the front gauge (on the drum) run relative to each other, resulting in overprinting. We use the method of adding a spring steel sheet to the paper clip to increase the force of the paper clip on the positioned printed sheet, thereby effectively eliminating the possibility of overprinting failure when the printer prints the above-mentioned print product. The machine originally had only two spring steel pieces on each paper clip, which could only adapt to prints of social parts with little pressure. As for the printed pages with large layout and pressure, the paper-drawing countries are obviously insufficient. After adding 3 pieces of spring steel to each paper clip, we have increased the paper grip on the paper. Now, printing of large area graphic products will no longer occur. The printing efficiency and products of the equipment Quality is guaranteed.