PROBLEM TO BE SOLVED: To improve operability in adjusting length of cord like cutting member in a rotary blade for a bush cutter having a function of adjusting a delivery length of the cord like cutting member.SOLUTION: The rotary blade includes a housing 100 which is attached to a rotary blade attaching shaft 14 to be rotated, has a central axis aligned with an attaching shaft 14 of the rotary blade, and has an annular accommodation chamber 114 centering the central axis a reel member 300 which is housed in the accommodation chamber 114, and rotatable around the central axis with respect to the housing 100 a cord like cutting member 4 whose base end is wound and held to the reel member 300, and a tip end is fed radially outside of the housing 100 through a leading hole 115 provided to the housing 100 and a feeding mechanism 400 which rotates the reel member 300 by a prescribed angle relative to the housing 100 by using a centrifugal force caused by the rotation of the housing 100 so that the cord like cutting member 4 is fed by a prescribed length.COPYRIGHT: (C)2015,JPO&INPIT【課題】コード状切断部材の延出長さを調節する機構を備えた草刈り機用回転刃において、コード状切断部材の長さ調節の操作性を向上させる。【解決手段】回転刃取付け軸14に取付けられて回転させられるとともに回転刃取付け軸14と一致する中心軸をもち、当該中心軸を中心とする環状の収容室114を有するハウジング100と、収容室114に収容され、ハウジング100に対し、上記中心軸周りに回転可能なリール部材300と、リール部材300に基端側が巻回保持され、先端側がハウジング100に設けた導出孔115から当該ハウジング100の半径方向外方に導出させられるコード状切断部材4と、ハウジング100の回転により生じる遠心力を利用して、ハウジング100に対してリール部材300を所定方向に所定角度ずつ相対回転させて上記コード状切断部材4を所定長さ繰り出す繰り出し機構400と、を含む。【選択図】 図3
