PROBLEM TO BE SOLVED: To provide a cutting blade part of a grass mower which is excellent in economical efficiency and convenience.SOLUTION: In a self-propelled grass mower 11 comprising a machine body 12 having a traveling part 21, and a cutting blade part 41 for planar cutting provided at the front part of the machine body 12, a cutting blade guide part 43 is provided on a lower surface side of a rotary cutting blade 42 of the cutting blade part 41, and the cutting blade guide part 43 is relatively rotatable with respect to a rotary shaft of the rotary cutting blade 42 via a bearing and has a bowl-shaped curved surface with respect to an installation surface. Adjustment means 64 of ground pressure during an operation of the cutting blade guide part 43 is provided. The cutting blade part 41 is liftable with respect to the traveling part 21, and the cutting blade guide part 43 is held by a link mechanism 51 that can follow irregularities of a ground contact surface.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】 経済性や利便性に優れた草刈機用の刈刃部を提供する。【解決手段】 走行部２１を有する機体１２と、 機体１２前方部に平面刈り用の刈刃部４１を設けた自走草刈機１１において、 前記刈刃部４１の回転刈刃４２の下面側に刈刃ガイド部４３が設けられていて、 刈刃ガイド部４３は、回転刈刃４２の回転軸に対し軸受を介して相対的に回転自在であり、設置面に対して椀状の曲面を有する。 刈刃ガイド部４３の作業時の接地圧の調整手段６４が設けられている。 前記刈刃部４１は、走行部２１に対して昇降自在であり、刈刃ガイド部４３が接地面の凹凸に追従できるリンク機構５１により保持されている草刈機用の刈刃部。【選択図】図１
