Link synthesis for the Rice Transplanting Mechanism

Abstract

To design the rice transplanting mechanism consisting of four bar linkage, the method to synthesize with the computer was investigated by analytical method. The condition to required for synthesis was obtained experimentally. The results are as follows.
(1) The path for tip of the tine to sweep was computed repeatedly under changing each link length with random number. The mechanism to satisfy the given condition was searched and by the Monte Carlo synthesis method. By using this method, we can give as condition not only position but position, velocity and the range without passing.
(2) To reform the link mechanism exactly, the method of minimizing the function of several variables was applied. And it was confirmed that this method was practical.
(3) The condition to transplant precisely was obtained from the experiment that was done with young seedling broadcasted, soil bin and the pistoncrank type of transplanting mechanism. As the results, it was necessary to be small the path of tine in the soil and was effective for the case of the velocity of the tine being high.
(4) By the above mentioned synthesis method, five examples of transplanting mechanism consisted with four bar linkage were synthesized with fairly accuracy.