The conditioning rolls of a crop harvester have intermeshing metal ribs arranged in a herringbone pattern, each rib comprising a pair of end-to-end segments that converge spirally from opposite ends of the roll to a centermost apex. An analysis module of a programmer such as a patient programmer, which programs a stimulation signal to be delivered to a patient, conducts an evaluation of the patient based on the first and second readings. The interactive television program guide provides users with an opportunity to define expressions that are processed by the program guide server. The first restricting part is provided on the main body and is configured to restrict the first roller from moving in a second direction perpendicular to the axial direction and the first direction when the belt unit is attached to the main body.