| 摘要 |
<p>There are lamellae suspended individually on laterally guided conveyor chains, for movement into a magazine for the opening position, on a large roller door for a large building. With the door closed, there is a narrow top guideway for the chain components, with drive exerting downward force on the chain. There is a switch unit (42) on a lower lamellae (40), emitting a control signal to stop the drive following relative movement of two lower lamellae (40, 41). Another device disengages the switch when the bottom lamellae is in the closed position. This prevents damage to a vehicle etc., which might be underneath as the door is closing.</p> |
