Abstract
The present study discusses the design of a manual rice-transplanting machine. A four bar mechanism is used to achieve the planting action of the machine. The machine is designed to plant multiple rows of seedlings at the same time. It is expected to be much faster and accurate, than the conventional manual transplanting of paddy. Moreover, the machine is operated by pulling it on the paddy field by a person and hence, it does not consume any conventional fossil fuel. A finger like fork is attached as a coupler extension to the four bar mechanism that pushes the rice seedlings from a tray to the planting area. The dimensions of each bar of the four bar linkage are determined from the coupler curve, using the three point coupler curve method. Input power to the mechanism is provided by the rotation of the cogwheels. There is a requirement of definite gear ratio between the driving cogwheel and the crank of the paddy-transplanting machine to sustain an optimum distance between two seedlings. The dimensions of the different links of the four bar mechanism are 406.80 mm (fixed bar), 120 mm (crank), 475.27 mm (coupler) and 278.63 mm (rocker). The present study contains detailed design 148analysis and estimation of different components used in the manual rice transplanting machine. Computer-aided drafting / design of the model for its fabrication is also included.
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