| 摘要 |
PURPOSE:To prevent a door from colliding with an on-off terminal by restraining a linear motor needle in the midway in such a state that a magnetic detection sensor signal becomes abnormal relative excitation relations. CONSTITUTION:When the occurrence of something wrong is detected, relative excitation relations in either of forward thrust, backward thrust and needle restraint are maintained as long as specified time irrespective of any state of a magnetic detecting sensors 3a-3c. With this constitution, since a door moves to a stator, it comes to relative positional relations where restraint is produced in a needle 32 in either position, whereby the needle 32 of a linear motor is restrained, namely, the door is stopped, thus a collision of the door against an on-off terminal is prevented from occurring. |
