The Brush Cutter payment machine 1 where it can provide vibrating absorption feature 3 in transmission path of Drive power from Drive source of the engine and the like, axial condition coupling portion of 10 and axial condition coupling 10 the tubed coupling the Interpolation to pass through vibrating absorption feature 3, on rim side of 20 which time motion unrestrictedly is interposed and tubed coupling, 20 the spring having with the time dynamic regulation means where regulates the time dynamic tonnage of 30 which is laid out between spring seat 14,25 where it is provided in each coupling 10,20 and spring 30, constitute, in spring seat 10,20, vis-a-vis the destal 31,32 of spring 30 the springIt provides the person in charge stopping difference in level 18,28 which person in charge stopping is done in the direction which enlarging diameter it can point, 30 multiple convex provision sections 16 of axial condition coupling 10 side and, it consists the concave streak section of the tubed coupling 20 side which stores this as time dynamic regulation means, the surface it makes the external wall surface of convex provision section contact 16 vis-a-vis the inner wall surface of the concave streak section.エンジン等の駆動源からの駆動力の伝達経路中に振動吸収機構3が設けられた刈払機1であって、振動吸収機構3を、軸状継手10と、軸状継手10の一部が回動自在に挿入される筒状継手20と、筒状継手20の外周側に挿通され、各継手10,20に設けられたバネ座14,25間に配置されるコイルバネ30と、コイルバネ30の回動量を規制する回動規制手段とを備えて構成し、バネ座10,20には、コイルバネ30の端部31,32に対してコイルバネ30を拡径させる方向に係止する係止段差18,28を設け、回動規制手段としては、軸状継手10側の複数の凸条部16と、これを収容する筒状継手20側の凹条部とで構成し、凹条部の内壁面に対して凸条部16の外壁面を面接触させる。
