| 摘要 |
PURPOSE:To make a device small by providing a rotatable screw shaft inside the hollow rotary shaft of a forwardly and backwardly rotatable motor, by screwing said shaft into a fixed nut member, and by rotatably providing a tenter arm on a frame. CONSTITUTION:An armature 3, etc., is provided outside the hollow rotary shaft 2 of a forwardly and backwardly rotatable motor 1, and a nut member 5 is fixed on the end section of the shaft 2 to form the body of a screw shaft 8 to be inserted. Moreover, the screw shaft 8 rotatably fixed in its end of a machine bed 9 is inserted into and penetrated through said body 7 to be inserted to screw it into a nut member 5. And, a mounting frame 11 is provided on the body 7 via a bearing 12, and the fixing part 13 of a tenter arm 13 is rotatably fixed on this frame 11. Hereby, the entier device can be greatly made compact since the motor 1 is equipped in the device body in a body with the nut member 5. |
