PROBLEM TO BE SOLVED: To provide a tillage work machine including an apron jump-up auxiliary device which has no possibility of damaging a gas spring due to contact with an obstacle during work and has a large degree of freedom of an attachment position of the gas spring.SOLUTION: The apron jump-up auxiliary mechanism includes: a gas spring having a front side supported by a front side support member so as to move in a front/rear direction and a rear side connected rotatably between a shield cover and an upper part of an apron, and constituted so as to generate elastic force in an extending direction at all times a link arm member having a front side supported by the front side support member together with the front side of the gas spring so as to move in the front/rear direction and a rear side connected rotatably with a rear side support member and a lock device restricting extension of the gas spring in the extending direction. The apron can be jumped up without using the apron jump-up auxiliary mechanism while a lock state of the lock device is maintained.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】作業中にガススプリングが障害物に接触して損傷する虞がなく、またガススプリングの取り付け位置の自由度が大きいエプロン跳ね上げ補助装置を備えた耕耘作業機を提供する。【解決手段】本発明のエプロン跳ね上げ補助機構は、前側が前側支持部材に前後方向に移動自在に支持され、後側がシールドカバー及びエプロンの上方間に回動自在に接続され、常に伸長方向に弾性力が発生するように構成されたガススプリングと、前側が前側支持部材にガススプリングの前側とともに前後方向に移動自在に支持され、後側が後側支持部材に回動自在に接続されたリンクアーム部材と、ガススプリングの伸長方向への伸びを規制するロック装置と、を含み、ロック装置のロック状態を維持したまま、エプロン跳ね上げ補助機構を利用しなくてもエプロンの跳ね上げが可能である。【選択図】 図1
