| 摘要 |
An electric actuator has a body (12) with a hole (14) defined therein and an electric motor (16) fixed to an end of the body (12). The electric motor (16) has a rotatable shaft to which a feed screw (20) is coaxially connected, and a feed nut (22) is threaded over the feed screw (20). The hole (14) receives an elongate cylindrical tubular member (24) slidably fitted therein which surrounds the feed screw (20). The feed nut (22) is secured to an end of the tubular member (24), and a support (26) for feeding a workpiece supported thereon is fixed to the other end of the tubular member (24). The feed screw (20), which serves as a drive force transmitting shaft, is protected by the surrounding tubular member (24) from the deposition thereon of dust, dirt, or other foreign matter and hence from unwanted shutdown or breakage. <IMAGE> |
