| 摘要 |
A linear and rotary actuator comprises an elongated casing (10) housing a lead screw (1) provided with two longitudinally spaced threaded portions (1A, 1B), two axially spaced apart nut members (3, 2) each engaging and supporting one of said threaded portions (1A, 1B); two axially spaced apart ring-shaped motors (4, 5) each comprising a rotor inside which each of said nut members (3, 2) is mounted, said motors being restrained in the axial direction by stop means (6, 7); two variable speed motor drives or inverters (14, 15) adapted to independently operate said motors (4, 5), and a control unit 16 controlling both said drives or inverters (14, 15). The linear and rotary power actuator has two degrees of freedom and power is compounded both in the linear and rotary mode to share the load on the mechanical devices and on the drives whereby the process of electric injection molding machines is optimised. <IMAGE> |
