transversely spaced row units each row unit being independently floatably supported by the frame each row unit has a forwardly and downwardly inclined frame with a top surface and a central fore and aft trough which forms the bottom of a fore and aft passageway a pair of endless flexible conveyor members are mounted on each row unit frame adjacent the top surface and have rearwardly moving inter meshing inner runs on opposite sides of the passageway a rotary cutting device being provided on the underside of the row unit frame adjacent the forward ends of the conveyor members for severing the crop from the field a transverse conveyor spans the rearward ends of the row units for conveying gathered material to a feeding unit for delivery to a processing unit on the combine a hood or gatherer sheet assembly in each row unit is composed of left and righthand portions one on each side of the fore and aft passageway respectively each portion being pivotable about a fore and aft axis and being releasably secured by spring latches application_number US 5869079 A description the invention is embodied in an improved row crop harvesting header of the type of which only a left hand portion is shown in fig1 the structure and function of such a machine is described in some detail in u s pat no 3 982 384 referred to above and such aspects of the machine will be described only briefly here it is well known that.