Abstract: A new type of rice transplanting mechanism-transplanting mechanism with eccentric sprockets is introduced, the essential elements in the mechanism drive include a sun sprocket, a pair of planet sprockets (planting arms were fixed on them) and a pair of tensioner sprockets. Mathematical model is founded on the basis of using the angle of taking seedling and planting seedling, seedling claw path, and path height as optimum object-function, the primary parameter of transplanting mechanism is determined. The drive part of transplanting mechanism is developed and the optimum method is proved by test. The national-invention patent for this mechanism is applied for.

Key words: Eccentric sprockets, Optimization, Rice tranplnter for multi-crops a year, Transplanting mechanism