With the development of science and technology, the functions of paper cutters are more and more, the operation is more and more simplified, the labor intensity is reduced, and the cutting accuracy is also improved, which is safer. But the safety screw of the paper cutter will also break during use, why?
        1. The blade of the paper cutter is not sharp enough;
        2. The sliders on the left and right ends of the knife holder are worn;
        3. It is not often necessary to tighten the fresh-keeping screws;
        4. The direction of the safety screw device is wrong;
        5. The two end faces of the connecting safety screw are not flat due to deformation;

        6. The blade is cut too deeply into the blade or the grinding of the blade is not straight.