| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent dust from entering a component of a drive motor while extending an exterior housing which externally clads a drive conversion mechanism over the external cladding portion of the drive motor. <P>SOLUTION: The exterior housing 11 extending forward and backward to externally clad a reciprocation conversion mechanism 40 and the drive motor 30 is provided around the circumference of a mechanism storage housing 45. A dust entry regulating structure 60 for preventing dust such as chips or the like from entering the drive motor 30 from a front end side of the reciprocation conversion mechanism 40 is provided between the mechanism storage housing 45 and the exterior housing 11. In the dust entry regulating structure 60, a first supporting rib 63 protruding from an inner peripheral surface 115 of the exterior housing 11 toward the mechanism storage housing 45 comes into contact with an outer peripheral surface 451 of the mechanism storage housing 45, thereby closing a clearance between the inner peripheral surface 115 of the exterior housing 11 and the outer peripheral surface 451 of the mechanism storage housing 45. <P>COPYRIGHT: (C)2013,JPO&INPIT |
