A draper platform includes a frame (32), a cutter bar (34), at least one conveyor assembly with two rollers (68), and a conveyor belt (72) surrounding both rollers. Each of the rollers is mounted to a respective support frame (58) that is independently pivotally mounted to the frame around a transverse axis (78) at its rear end. An assembly for guiding the conveyor belt on the rollers is provided. It includes a ridge (84) on an interior side of the belt and a groove (82) within the roller. The ridge and the groove are provided in the vicinity of the rear end of the rollers.
