| 摘要 |
An electric actuator that is structured simply, low in costs and high in both energy efficiency and operation accuracy and is capable of realizing frequent activation and stop is provided. In a return stroke in which a linear actuator is in low load operation state, an energy generated by an electric motor and a kinetic energy generated by movable portions when they stop are absorbed and accumulated by a coil spring. By this constitution, it becomes possible to cause the movable portions of the linear actuator to quickly stop while eliminating the necessity of giving a braking force by an electric or mechanical brake or the like and of providing a configuration designed for giving a braking force in a reliable manner such as one provided as a measure against heat generation. On the other hand, in an actuation stroke, the energy accumulated in the spring is released as operation energy of the movable portions when the spring extends and a driving force required of the electric motor is reduced.
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