Patent ID: 8650978
Filing Date: 2014-02-18
Classification: F16C,H02K,Y10T

Abstract:
1. A linear actuator provided with a dust-proof mechanism, comprising: a ball screw; a movable stage provided with a ball screw nut engaged with the ball screw and configured to be reciprocally movable in an axial direction of the ball screw in accordance with a rotational motion of the ball screw; a housing member disposed so as to cover at least the ball screw; an opening portion formed in the housing member so as to extend along a moving locus of the movable stage; and dust-proof belts stretched inside the housing member so as to close the opening portion by being mounted to mounting members disposed both end portions of the housing member, wherein a bypass member for bypassing the dust-proof belts positioned at positions overlapped with the movable stage is provided for the movable stage so as to realize movement of the movable member along the opening portion while closing and sealing the opening portion by the dust-proof belts, and the dust-proof belts are wound up around the mounting member and sandwiched between the mounting member and the end portions of the housing member.