This document describes the development of a mechanism for transplanting rice seedlings using a self-propelled transplanter. The mechanism uses a four-bar linkage to pick up rice seedlings from a tray and plant them into the soil at the proper depth and orientation. The linkage is analyzed using graphical and analytical methods to optimize the path of the planting finger for continuous and efficient transplanting as the machine moves forward. Link dimensions, inclination angle, and forward speed are varied to refine the mechanism's performance. The developed mechanism aims to mechanize the labor-intensive transplanting process while mimicking manual transplanting methods.