PROBLEM TO BE SOLVED: To correct troubles such as twisting and the like of transmission elements caused by functionating non-uniform speed members in a rice transplanter having a rotary type seedling planting device.SOLUTION: Non-uniform speed members 48, 56, 121, 122, 98, 99 transmitting non-uniform rotational power to a transplanting mechanism 8 are installed by separating the same into upstream non-uniform speed members 48, 56, 121, 122 on the inter-row spacing speed-changing device 26 side and downstream non-uniform speed members 98, 99 on the seedling planting device side. The upstream non-uniform speed members 48, 56, 121, 122 are switchable between multiple gears and the acceleration/deceleration ratios for each gear are brought to be different, and the downstream non-uniform speed members 98, 99 are formed in a single gear. In each of the gears for the upstream non-uniform speed members 48, 56, 121, 122, the maximum speed phase, where the operating speed of planting claws 96 in the transplanting mechanism 8 is at the maximum speed, is brought to be changeable in a longitudinal range with the bottom dead center as a center.COPYRIGHT: (C)2013,JPO&INPIT【課題】ロータリー式の苗植付装置を有する田植機において、不等速部材を機能させることに起因した伝動要素のねじれ等の不具合を是正する。【解決手段】移植機構8に不等速回転動力を伝達する不等速部材48,56,121,122,98,99を、株間変速装置26側の上流不等速部材48,56,121,122と苗植付装置側の下流不等速部材98,99とに分けて設けられる。上流不等速部材48,56,121,122は複数段に切換可能で且つ各段の加減速比を異ならせ、下流不等速部材98,99は単段に構成する。上流不等速部材48,56,121,122の各段では、移植機構8における植付爪96の動作速度が最高速になる最高速位相を、下死点を挟んだ前後範囲で設定変更可能にする。【選択図】図8
