PROBLEM TO BE SOLVED: To provide a crop stalk cutting machine capable of preventing change in the vertical position of a stalk cutting blade whose cutting position is determined by the resistance generated in cutting crops or the vibration of a machine body, and capable of uniforming the cutting height, and capable of preventing damage to targets for harvesting such as leaves.SOLUTION: The crop stalk cutting machine includes a holding conveyor 5 in a travelling machine body 3 for holding stalks T of planted crops and conveying the held stalks to the rear, and the stalk cutting blade 58 in the travelling machine body 3 for cutting the stalks T of the crops held by the holding conveyor. The position in the vertical direction of the stalk cutting blade 58 relative to the travelling machine body 3 is adjustable. The stalk cutting blade 58 is fixed to the lower end of a stalk cutting blade driving shaft 54, and the stalk cutting blade driving shaft 54 is journaled by a shaft supporting inner cylinder 55. The shaft supporting inner cylinder 55 is fitted into an shaft supporting outer cylinder 56 fixed to the travelling machine body 3 in such a way as slidable in the vertical direction. The crop stalk cutting machine also has a holder member 57 for fixing the shaft supporting inner cylinder 55 to the shaft supporting outer cylinder 56.COPYRIGHT: (C)2012,JPO&INPIT【課題】作物の切断時に生じる抵抗力や機体の振動によって、切断位置を決めた幹切刃の上下位置が変更することを防止し、切断高さを統一すると共に葉部等の収穫対象部を傷つけることの無い作物幹刈り機を提供する。【解決手段】植立した作物の幹Tを挟持して後へ搬送する挟持搬送装置5を走行機体3に設け、挟持搬送装置で挟持された作物の幹Tを切断する幹切刃58を走行機体3に設けた作物幹刈り機において、幹切刃58の走行機体3に対する上下位置を調整可能に構成し、幹切刃駆動軸54の下端部に幹切刃58を固着し、幹切刃駆動軸54を軸支持内筒55で軸支し、軸支持内筒55を走行機体3に固定の軸支持外筒56に上下摺動自在に嵌合し、軸支持内筒55を軸支持外筒56に固定する保持部材57を設けて構成する。【選択図】図4
