| 摘要 |
A limit mechanism for door machine for controlling the door curtain in such a manner that it stops accurately at an upper stop level and a lower stop level, the door machine including an output pulley driving a reel of the door curtain. The limit mechanism comprises: a screw rod both ends of which are rotatably supported on a frame, the end portion of one end of the screw rod being provided with a driven pulley which interlinks with the reel of the door curtain; a pair of nut blocks each having a threaded hole centrally arranged for joining with the screw rod so as to slide thereon; a pair of lock devices for locking relative positions between the pair of nut blocks; and a pair of buffer devices arranged respectively at both ends of the screw rod for limiting the sliding stroke of the nut blocks. |
