PROBLEM TO BE SOLVED: To solve such problems that operation to adjust the initial opening degree by adjusting an urging force is troublesome in a dust feeding guide for evacuating and rotating against the urging force of a spring with a load received from materials to be treated in a threshing chamber.SOLUTION: There are provided a means (a second adjusting means) for increasing or decreasing the urging force of the spring 39 acting on an arm plate 37 rotating integrally with the dust feeding guide 27 by controlling the drive of an actuator 46, and adjusting the initial opening position of the dust feeding guide 27 and a means (a first adjusting means) for autonomously rotating the dust feeding guide 27 to a position where the load from the materials to be treated is balanced with the urging force of the spring 39 using the initial opening position with the second adjusting means as a basis, and adjusting an evacuation angle thereof.COPYRIGHT: (C)2013,JPO&INPIT【課題】扱室内の処理物から受ける負荷によりスプリングの付勢力に抗して退避回動する送塵ガイドにあって、該付勢力を調節して初期開度を調節する操作が面倒である。【解決手段】アクチュエータ46が駆動制御されることで、送塵ガイド27と一体となって回動するアームプレート37に作用するスプリング39の付勢力が増減し、送塵ガイド27の初期開度位置が調節される(第2の調節手段)。該第2の調節手段による初期開度位置を基準に、送塵ガイド27は、処理物からの負荷とスプリング39の付勢力が平衡する位置に自律的に回動して、その退避角度を調節する(第1の調節手段)。【選択図】図7
