PROBLEM TO BE SOLVED: To provide a waste straw shredder capable of effectively preventing entwining or clogging with dust in a bearing or a rotation shaft.SOLUTION: The waste straw shredder includes: a case-side cover 53 fixed to the inner side of a shredding case 40 in such a state as located coaxially with the rotation shaft 42 on the outer periphery of a holder 50 of the bearing 51 and a shaft-side cover 54 which is integrally rotatably connected to the rotation shaft 42 in such a state that the outer peripheral part 54c overlaps with the case-side cover 53 in the radial direction of the rotation shaft 42, and which relatively rotates to the case-side cover 53. A dust discharge opening 55 is disposed below the case-side cover 53 for discharging dust from a cover inner space 56 formed in the periphery of the holder 50 by the case-side cover 53 and the shaft-side cover 54. A rotary member 57 for scraping off the dust to the dust discharge opening 55 is disposed in the cover inner space 56 in such a state as rotatable integrally with the rotation shaft 42.COPYRIGHT: (C)2013,JPO&INPIT【課題】ベアリングや回転軸への塵埃の巻き付きや詰まりを良好に防止できる排ワラ細断装置を提供する。【解決手段】ベアリング51のホルダ50の外周囲に回転軸42と同軸芯状に位置する状態で細断ケース40の内面側に固定されるケース側カバー53と、外周部54cがケース側カバー53に対して回転軸42の半径方向に重合する状態で回転軸42に一体回転自在に連結されてケース側カバー53に対して相対回転する軸側カバー54とを設けてある。ケース側カバー53の下部に、ケース側カバー53と軸側カバー54とによってホルダ50の周囲に形成されるカバー内空間56から塵埃を排出する排塵開口55を設けてある。カバー内空間56に、排塵開口55に塵埃を掻き出す回転部材57を回転軸42と一体回転自在に配備してある。【選択図】図16
