1) Pedal driven thresher The pedal driven thresher is composed of threshing cylinder. frame and transmission as shown in Fig. 3. The threshing cylinder has v-type threshing teeth which are fixed on the surface of a wooden drum. Then up and down motions of pedal are changed to rotary movements by crank mechanism. Those rotary movements are accelerated by gears and drive the thresing cylinder. To boost threshing performance threshing teeth should not be inclined or twisted toward the rotating direction. In case of this thresher as ear-breaking and waste straws were fallen, clean grains must select from mixture by winnower, etc .