PROBLEM TO BE SOLVED: To grind safely and efficiently a cutting blade of a swing bag system.SOLUTION: A blade grinding device (40) includes blade grinding members (41, 42) arranged on a facing surface to a unit base member (43) arranged oppositely to a cutting blade (31) having blades (31e3/31e4) to be ground, and having each rotation locus of the blades (31e3/31e4) of the cutting blade (31) moving rotatively around a shaft (34), and each circular shape superposed in a plan view.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2016,JPO&INPIT【課題】、スイングバッグ方式の刈刃を安全に、かつ、効率よく砥ぐ。【解決手段】刃砥ぎ装置(40)は、刃(31e3・31e4)を砥ぐ刈刃(31)と対向配置されるユニットベース部材(43)の対向面に配され、軸(34)の周りを回転移動する刈刃(31)の刃(31e3・31e4)の回転軌跡と、平面視したとき重畳する円形状を有する、刃砥ぎ部品(41・42)とを備える。【選択図】図1
