| 摘要 |
The automatic door installation has a swinging door (12), a power operator for swinging the door between open and closed positions, and a traffic responsive control system for sensing traffic through the doorway opening. Door control means comprise at least one multiple emitter sensor (28, 29, 32) having a bank of a plurality of radiant energy emitters and radiant energy receiver means (28, 29, 32) mounted adjacent the bank of emitters (28, 29, 32) for receiving reflected radiant energy emitted from the bank of emitters. The multiple emitter sensor (32) is a swing side sensor mounted at one side of the traffic path of travel. The traffic responsive control system further comprises door positions responsive means for selectively operating the emitters of the said swing side sensor (32) to vary its effective coverage as the door (12) is swung between its said closed and open positions. |
