A blade device for a mowing machine is capable of being driven by a rotating shaft of the mowing machine. The blade device comprises a blade holder mounted on the rotating shaft of the mowing machine, two blade units capable of rotating along with the blade holder, and two position-limiting units. The blade holder includes two spaced end portions, and the blade units are respectively mounted on the end portions of the blade holder. Each of the blade units includes a blade protruded from the end portion of the blade holder and a pivot member utilized to mount the blade on the end portion of the blade holder. The position-limiting units respectively correspond to the blades of the blade units. Each of the position-limiting units includes a position-limiting member and a buffer slot capable of being formed on the blade holder or the blade of the blade unit. When the blades of the blade units are drastically impacted, the blades of the blade units can pivotally swing along the buffer slots of the position-limiting units to attain buffering effect, thereby preventing the blades from being cracked or broken into pieces moreover, the blades of the blade units can rapidly return to a normal position by centrifugal forces, thereby preventing the malfunction of the blades of the blade units getting stuck on the blade holder.一種割草機的刀片裝置,可被割草機之一轉動軸帶動旋轉,並包含:一個安裝在該轉動軸上的刀座、兩個可隨刀座旋轉的刀片單元,及兩個限位單元。該刀座包括兩相間隔的端部。該等刀片單元分別安裝在該等端部,並都包括一突出所述端部的刀片,及一將該刀片安裝在該端部上的樞接件。該等限位單元分別對應於該等刀片,並分別包括一緩衝槽,及一限位件。該等緩衝槽可形成在該刀座或刀片上。該刀片受激烈撞擊時,可沿該緩衝槽樞擺,進而達到緩衝效果,以避免刀片碎裂,此外,還可藉離心力作用迅速地回到正常位置,避免刀片卡在刀座下而故障。2...刀座21...座頂面22...座底面23...軸穿孔24...端部25...座樞軸孔3...刀片單元31...刀片311...安裝部312...切割部313...刀樞軸孔314...限位孔315...受推刀刃32...樞接件4...限位單元41...緩衝槽411...止動端412...限位端413...止動壁部42...槽圍壁43...限位件44...墊片5...轉動軸
