自由断面掘削機

Also known as boom-type roadheader, road header machine, road header, header machine

thumb|250px|A typical roadheader A roadheader, also called a boom-type roadheader, road header machine, road header or just header machine, is a piece of excavating equipment consisting of a boom-mounted cutting head, a loading device usually involving a conveyor, and a crawler travelling track to move the entire machine forward into the rock face.