PROBLEM TO BE SOLVED: To sow seeds with excellent accuracy regardless of presence of inclination in the lateral direction of a traveling machine body by accurately detecting presence of failure in sowing seeds in respective seed feeders.SOLUTION: A working part S includes a plurality of seed feeders A arranged in the lateral direction of the traveling machine body for intermittently feeding seeds stored in a seed tank 32 by a set amount by a feeding rotator 52 which can be rotationally driven and dropping the seeds toward a field. In the paddy field working machine, the working part S is connected to the rear of the traveling machine body in such a way as to roll around a rolling axis X in the longitudinal direction of the traveling machine body. The height of disposition of the feeding rotator 52 in each of the plurality of seed feeders A is set approximately equal to the height of disposition of the rolling axis X. Each of the plurality of seed feeders A includes an optical sensor 90 for detecting drop of seeds in a dropping feed pathway disposed for dropping seeds from the feeding rotator 52 toward the field.COPYRIGHT: (C)2012,JPO&INPIT【課題】各種子供給装置における播種ミスの有無を精度よく検出できるようにし、かつ走行機体の左右傾斜の有無にかかわらず良好な点播精度で播種作業できるようにする。【解決手段】種子タンク32に貯留された種子を駆動回転自在な繰出し回転体52によって設定量ずつ間欠的に繰出して圃場に向けて落下させる種子供給装置Aの複数を走行機体横方向に並べて備える作業部Sを、走行機体の後部に走行機体前後向きのローリング軸芯Xまわりにローリング自在に連結してある。複数の種子供給装置Aのそれぞれにおける繰出し回転体52の配置高さをローリング軸芯Xの配置高さにほぼ等しく設定してある。複数の種子供給装置Aのそれぞれが繰出し回転体52からの種子を圃場に向けて落下させるように備える落下供給路における種子の落下を検出する光学式センサ90を設けてある。【選択図】図4
