US Patent 8651794 Automated bed-loaded container unloader and method

An automated unloading apparatus, system and method for use with a container having a plurality of items located on a base belt. The apparatus includes a ramp, a conveyor, a stack control curtain, and a tensioning mechanism. The ramp is configured to pass under the base belt. The conveyor is configured to remove a first item from the plurality of items. The stack control curtain is configured to retain a second item of the plurality of items during removal of the first item. The tensioning mechanism is configured to couple to the base belt and maintain a desired tension on the base belt during passage of the nose ramp under the base belt and removal of the first item.