PROBLEM TO BE SOLVED: To provide a seedling transplanter that is provided with a torque smoothing mechanism in a planting transmission shaft system of a planting unit to generate an opposite phase torque in the planting transmission shaft system to thereby prevent torsional vibration of the planting transmission shaft system, thus stabilizing a planted state of seedlings, and achieving improved workability.SOLUTION: The seedling transplanter includes: a transmission mechanism (PTO shaft 123) for extracting a drive PTO output from a mission case 4 and a planting drive unit for driving, by the power from the PTO shaft 123, a planting arm 22 for supporting and rotating a planting claw 17. The planting drive unit includes: a planting drive horizontal shaft 51 for driving the planting arm 22 by an non-uniform speed gear mechanism and a planting drive vertical shaft 53 for distributing the planting drive force from the planting drive horizontal shaft 51 to the planting arm 22. The planting drive unit is provided with the torque smoothing mechanism 101.COPYRIGHT: (C)2013,JPO&INPIT【課題】植付部の植付伝動軸系にトルク平準化機構を設け、植付伝動軸系に逆位相のトルクを発生させて植付伝動軸系のねじり振動を防ぐことで苗の植付状態を安定化し、作業性を向上させた苗移植機を提供する。【解決手段】ミッションケース4から駆動PTO出力を取り出す伝動機構(PTO軸123)と、PTO軸123からの動力で、植付爪17を支持して回転させる植付アーム22を駆動させる植付駆動手段とを備え、植付駆動手段は、植付アーム22を不等速機構によって駆動する植付駆動横軸51と、植付駆動横軸51からの植付駆動力を植付アーム22に分配する植付駆動縦軸53とを備え、植付駆動手段には、トルク平準化機構101を設けた。【選択図】図4
