It is impossible for all the ink on the surface of the rubber head to be transferred to the printed matter, and the ink left on the rubber head will change slowly, forming the edge of the pattern trace on the surface of the rubber head, resulting in a decline in clarity. There are two ways to deal with this kind of problem: improving the deinking level of rubber head; Additional automatic cleaning rubber head system. But it is not so easy to improve the deinking level of rubber head, so most of the solutions are to install an automatic cleaning rubber head system. The automatic cleaning rubber head system is characterized in that there is one more step to replace the ink on offset paper than the general pad printing machine during the retraction of pad printing rubber head, and the residual ink on its surface will be cleaned up. Multi-color printing and automatic cleaning rubber head system can obviously improve the accuracy of multi-color pad printing. For example, multicolor printing involves dot printing, and dot enlargement will be obviously controlled. Therefore, the application of automatic cleaning rubber head system in high-end precision pad printing machine is essential.