The automatic tool changer is an important part of the machining center. The earliest machining center tool changers were all hydraulically driven. Not only did the tool change time be long, but the reliability was poor, making it difficult to adapt to the needs of modern machining. The cam type automatic tool change device developed in recent years has well overcome the above disadvantages. The utility model has the advantages of simple control, good coordination between actions, fast tool change speed and high reliability, and is an advanced ATC device currently used. In this ATC,