| 摘要 |
<P>PROBLEM TO BE SOLVED: To excellently control an actuator in a foldable stage device while securing stability. <P>SOLUTION: When changing over from a storage state to a development state, a brake is released, an electric motor is started, and a pair of stages Sf, Sr are relatively turned by a link mechanism 30 for driving. when at least one of two limit switches is turned on, the electric motor is stopped, and when a specified period of time elapses, the brake is locked. When the electric motor is stopped, the electric motor rotates with its dead weight even if legs LQ1 to LQ4 do not land on a floor surface F, and stage planes Tsf, Tsr are lowered and the legs LQ1 to LQ4 land on the floor surface. Compared with a case in that the electric motor is operated until all the legs land on the floor surface F, the load of the electric motor can be reduced as well as the service life thereof can be prolonged. <P>COPYRIGHT: (C)2012,JPO&INPIT |
