| 摘要 |
PURPOSE:To suppress the loss of a torque and the fluctuation of a motor shaft by supporting the motor shaft by bearings disposed outside of a motor body. CONSTITUTION:A bearing mechanism of a motor 18 is disposed at a bearing mounting body 21 secured to a chassis 2 in front of a motor body 19, and supported by bearings 29, 31 mounted in the body 21 of a motor shaft 20 formed integrally with a lead screw 35. Accordingly, since the shaft 20 is supported at the portions projected from the body 19 and hence at both ends of the portion formed with the lead screw 35 by bearing members 29, 31, at least the rotating speed for moving the lead screw 35, i.e., a movable member can be extremely stabilized. |
