PROBLEM TO BE SOLVED: To reduce the vibration of a trimmer used for pruning trees such as branches and leaves of planting and a hedge.SOLUTION: The base end of a blade 22 of the trimmer is formed with a cam hole 32 having intersection surfaces 36, 37 on the base end side and the tip side in a direction to intersect the longitudinal direction of the blade 22, and an eccentric cam 34 arranged in the cam hole 32 is driven to rotate around a rotation center axis P decentered in a major axis direction with respect to a center point O of an imaginary circle S with a major axis diameter as a diameter. The reversing part 41 side of the eccentric cam 34 is formed with an acceleration surface 43 acceleratingly changing the movement of the blade 22 associated with the rotation of the eccentric cam 34, and the reversing part 42 side of the eccentric cam 34 is formed with a constant speed surface 44 not accelerating the movement of the blade 22 associated with the rotation of the eccentric cam 34.COPYRIGHT: (C)2013,JPO&INPIT【課題】刈込機の振動を低減する。【解決手段】刈込機のブレード22の基端部には、ブレード22の長手方向に対して交差する方向に基端部側と先端部側の交差面36,37を備えたカム孔32が形成され、カム孔32内に配置される偏心カム34は、長軸径を直径とする仮想円Sの中心点Oに対して長軸方向に偏心した回転中心軸Pを中心に回転駆動される。偏心カム34の反転部41側には、偏心カム34の回転に伴うブレード22の移動を加速変化させる加速面43が形成され、偏心カム34の反転部42側には、偏心カム34の回転に伴うブレード22の移動を加速させない定速面44が形成されている。【選択図】図3
