Unloader

An unloader for unloading bulk commodities within holds, such as wheat and coal. A plurality of boom conveyers are juxtaposed on a boom, and vertical screw conveyers, each having at the lower end an inlet port for receiving a bulk commodity to be conveyed and at an upper portion a chute for discharging the bulk commodity into the corresponding boom conveyer, are used in unloading by exclusively combining the vertical screw conveyers with the corresponding boom conveyers. In this way, the unloader is provided with a plurality of conveyance routes so as to be applicable to unloading of a plurality of different kinds of bulk commodities. Because one conveyance route can be exclusively used in unloading in accordance with the kind of bulk commodity to be unloaded, there is no need to clean the vertical screw conveyer and boom conveyer each time the kind of bulk commodity to be unloaded changes.