New Type anti-devices of roller door motor:
1. New type: Acting on the motor shaft worn and chain broken suddenly;
2. Play a double protection, to prevent the role of secondary injury；
Compared with traditional anti-fall device of door motor, the traditional only make useful when the chain broken.
When the door constant rise or fall, the anti-fall device will normal working followed with roller shutter motor. If the chain broken or motor shaft worn and the door speed up falling out of control, the anti-fall device will start working to stop the door to accelerate falling. Meanwhile, the stop switch will be driven. And then, the motor stops.
