PURPOSE: A coupling structure of a straight articular cutter blade for a grass eliminator is provided to be disassembled easily by loosening or tightening a piece or a bolt of a bracket in case of replacing the straight articular cutter blade as having solid structure with minimum process and cost, by being integrally shaped through press-molding of a rotary wheel. CONSTITUTION: A rotary wheel (100) having a shaft bonding groove inserted to a rotary shaft of the eliminator is constituted in a circular center part, and 3-4 cutter blade joint combining parts are installed in the outer circumference of the rotary wheel in equal space of 90°； or 120°；. A straight cutter blade (300) is bonded to the cutter blade articular combining part in the articular shape. A pressing-protruded "&cap；"-shaped hook (210) is formed in the front of the cutter blade articular combining part. A locking piece is constituted in the end of the hook by being protruded downward. A replacement cut groove is punched in a rotary wheel in the rear of the hook, and secures constant space required in replacing the straight cutter blade. A screw fastening groove is formed in the rear side of the replacement cutting groove, and a guide bracket settlement groove is formed as being engraved into a fixed depth. A guide bracket (230) guiding the locking for preventing separation of the straight cutter blade hooked to the hook is assembled and constituted between the guide bracket settlement groove and the locking piece of the hook.본 발명은 원형 회전휠 외곽에 일자형(-)이면서 관절형태로 걸림된 다수의 일자 관절형 커터날이 일정한 등간격으로 결합되어 있는 예초기용 일자 관절형 커터날 유닛의 바람직한 결합구조에 관한 것이다.즉, 본 발명은 샤프트 결합홈(110)을 갖는 회전휠(100)의 외곽 둘레에 커터날 관절 결합부(200)가 구성되고 상기 커터날 관절결합부(200)에는 일자형 커터날(300)이 각각 관절형태로 결합되는 통상의 예초기용 일자 커터날 관절결합구조에 있어서, 상기 커터날 관절 결합부(200)의 선측에는 회전휠(100)과 일체형을 돌출된 "∩"형 걸림고리(210)가 형성된 것과； 상기 걸림고리(210)의 끝단에는 하방 돌출된 잠금돌편(211)이 구성된 것과； 상기 걸림고리(210) 후측의 회전휠(100)에는 교체용 절개홈(220)이 천공된 것과； 상기 교체용 절개홈(220)의 후측지점과 걸림고리(210)의 잠금돌편(211) 사이에는 상기 걸림고리(210)에
