US Patent 10264728 Harvester head draper belt tracking

A harvester head may include a frame, a roller configured to support a draper belt and at least one tracking correction arm. The roller has a rotational axis and is pivotably supported by the frame about at least one pivot axis nonparallel to the rotational axis. The at least one tracking correction arm is coupled to the roller and may include a first belt bump stop and a second belt bump stop. The first and second belt bump stops contact portions of the draper belt such that mistracking of the draper belt relative to the roller pivots the roller about the pivot axis until the draper belt is automatically moved back into a tracking relationship with the roller.