| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a simple and inexpensive screw driving device axially short even though it is capable of injecting at a high speed. <P>SOLUTION: The screw driving device (5) includes a ball screw (6) fixed in a rear end of a screw (3) at its one end (6a), a ball nut (7) screwed thereto, and first and second motors (9, 10). In the first motor (9), a rotor (21) is formed in a hollow shape by a cylindrical part (21a) and a bottom (21b), and the other end (6b) of the ball screw (6) is fixed in the bottom (21b). In the second motor (10), a rotor (24) is formed in a hollow shape, and the ball nut (7) is fixed inside thereof. The second motor (10) is arranged so as to be inside the first motor (9). <P>COPYRIGHT: (C)2012,JPO&INPIT |
