| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an actuator which has a mechanism for preventing an output shaft from slippage caused by an external force inputted from a load side, can be composed of a small number of components and has high reliability. SOLUTION: A slip preventive mechanism 30 comprises a restriction gear 32 which is geared with a pinion 25 turned with a rotation of a drive motor 22 to be in an engaged state or in a disengaged state and arranged in a rotation impossible region, wherein it cannot be turned at least in one direction, if it is in the engaged state; and a changeover motor 31 which turns the restriction gear 32 and changes the state of the restriction gear 32 and the pinion 25 between the engaged state and the disengaged state.</p> |
