PROBLEM TO BE SOLVED: To provide a trimmer trimming branches and leaves with good trimming efficiency.SOLUTION: This trimmer is such that an eccentric cam rotates 45 degrees by the time that a condition that an upper cutting blade and a lower cutting blade are superposed on each other (the pitch distance is P, and the rotation angle is 0 degree) becomes a condition that both the blades separate relatively for a distance L, and when the eccentric cam 4 further rotates to bring a rotation angle to about 155 degrees, the pitch distance is L, and when the eccentric cam further rotates about 25 degrees from about 155 degrees to bring the rotation angle to 180 degrees, the upper cutting blade and the lower cutting blade move relatively for a distance L and are superposed on each other (the pitch distance is 0, and the rotation angle is 180 degrees). In other words, the shape of the eccentric cam and the engagement part is so set that the movement speed of the upper blade and the lower blade becomes fast just before performing trimming action, and the movement speed of the upper blade and the lower blade becomes slow just after starting to move from an initial position.COPYRIGHT: (C)2012,JPO&INPIT【課題】刈込効率のよい刈込機の提供。【解決手段】上刃の切刃と下刃の切刃とが重なった状態(ピッチ間距離がP、回転角度が0度)から相対的に距離L離間する状態になるまでに偏心カムは45度回転する。さらに偏心カム4が回転して回転角度が約155度になるときピッチ間距離はLである。回転角度が約155度の状態からさらに約25度回転して、回転角度が180度に至ると上刃の切刃と下刃の切刃とが相対的に距離L移動して重なる状態(ピッチ間距離が0、回転角度が180度)となる。つまり、偏心カム及び係合部の形状は、刈込動作を行う直前には上刃及び下刃の移動速度が速く、初期位置から移動し始めた直後には上刃及び下刃の移動速度が遅くなるように設定されている。【選択図】図6
