PROBLEM TO BE SOLVED: To provide a roll baler that reduces a workload to an operator, facilitates maintenance and lowers various costs.SOLUTION: A support member 6 that has retention power for holding the original position of a floorboard 3, shrinks or extends according to power in the fall direction exceeding the retention power to the floorboard 3 so as not to obstruct the fall of the floorboard 3, shrinks or extends against power below the retention power so as to raise the floorboard 3 and return the floorboard 3 to the original position is used.COPYRIGHT: (C)2011,JPO&INPIT【課題】オペレータに対する作業負荷を低減するとともに、メンテナンスを容易にし、かつ各種コストを低減する。【解決手段】床板3の原点位置を保持する保持力を有し、床板3に対する保持力を超える下降方向への力に応じて収縮又は伸長して床板3の下降を阻害せず、保持力未満の力に抗して収縮又は伸長することで床板3を上昇させて床板3を原点位置に復帰させる支持部材6を用いる。【選択図】図3
