| 摘要 |
A motor-driven injection drive device for injection molding machine, comprising a fixed frame (4) having an injection cylinder (8), first and second injection drive motors (7), and first and second ball screw shafts (10), first and second power transmission mechanisms (12) transmitting the rotating forces of the first and second injection drive motors (7) to the first and second ball screw shafts (10), respectively, while reducing speed, first and second ball screw nuts engaged with the first and second ball screw shafts (10), respectively, and a moving frame (6) having a screw rotation drive motor (14) mounted thereon and movable in injection direction together with an injection screw (9), whereby the moving frame (6) is moved so that a tensile force acts on the first and second ball screw shafts (10) in injection process.
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