It is officially called a transfer machine. A transfer machine is a machine that processes a product by installing a number of facilities on both sides of the line along which the product passes, and is suitable for mass production and has low versatility. Specifically, it is a machine tool that combines an automated machine tool with an automated transportation device to perform a series of machining operations automatically. It is also recognized as a group of machines responsible for the production of power units such as automobile engines and transmissions.