| 摘要 |
A displacement-preventing device includes a control device electrically connected to an AC power source. The control device includes an upward movement contact, a downward movement contact, and a common contact. A power circuit is electrically connected to the common contact and converts the AC power source into a DC power source. A positing circuit is electrically connected to the control device, the power circuit, and the motor. The control device is operable to control rotation of the motor in either of two opposite directions for moving the coilable shade in the coiling direction or the uncoiling direction. The control device stops the motor when no power is input to the motor, and the positioning circuit causes a positive terminal of the motor to be in electrical connection with a negative terminal of the motor.
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