It is impossible for all the ink on the surface of the rubber head to be transferred to the printed object. The remaining ink on the rubber head will slowly change and form the edge of the pattern mark on the surface of the rubber head, resulting in a reduction in clarity. . There are two ways to deal with this kind of problem: improve the deinking level of the rubber head; add an additional automatic cleaning rubber head system. However, it is not easy to improve the deinking level of the rubber head, so most of the solutions are to install an automatic rubber head cleaning system. The characteristic of the automatic cleaning rubber head system is: in the process of retracting the pad printing rubber head, there is one more step than the ordinary pad printing machine to transfer ink on the adhesive paper, and the remaining ink on the surface will be cleaned. . For multi-color registration printing, the automatic cleaning rubber head system can obviously improve the accuracy of color registration and pad printing. For example, when multi-color registration printing involves the printing of dots, the dots will become larger. Obvious control will be achieved. Therefore, the application of automatic rubber head cleaning systems on high-end precision pad printing machines is essential.