In this paper we are presenting the method to solve the problem of lack of skilled labor and machine for reaping of crops. We produce a semi-automatic manual mechanical device which will be used for reaping of crops. This machine named Rongo Reaper (Rongo means continuity in the tribal language of Jharkhand, India). This machine is assembly of some existing mechanism and some mechanism developed by us, such as metallic body , bevel gear mechanism, set of small wheel, wheel axle, cylindrical metallic rod, four pedestal bearing, stationary blade frame , crank mechanism designed our self, connecting rod and metallic cutting blade. The detailed diagram of Rongo Reaper is shown in next section. The set of wheel are connected to each other with the help of wheel axle. A crown is mounted on the wheel axle parallel to the wheel and perpendicular to the axis of wheel axle. This wheel and crown assembly is mounted on the metallic structure. Wheel shaft is mounted on structure with the help of set of pedestal bearing. Now another cylindrical shaft is taken and on its one end pinion is mounted and on the other side crank is mounted. This shaft is positioned in such a way, so that it is parallel to the structure surface and perpendicular to the crown gear. The second cylindrical shaft fixed on structure with the help of two pedestal bearing. The arrangement is shown in the assembly diagram. After that blade frame is mounted on the structure with the help of rivets and cutting blade is inserted in the frame. The blade frame is designed in such a way, so that blade easily reciprocates inside frame without interruption. At the final stage of assembling the crank and blade"s one end is connected with the help of connecting rod and fastening device such as nutbolts. Like this the Rongo Reaper is assembled. The assembly diagram is shown in next section. Keywords; New designed crank,Crown, Pinion, Rongo, Pedestal bearing, Wheel axle, Connecting rod.
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