| 摘要 |
A electrically driven curtain assembly comprises a case, a curtain shaft, housed in the case, a curtain, wound up to a varying degree on the curtain shaft, a driving device, driving a rotational movement of the curtain shaft, a control circuit for controlling operation of the driving device, a gear assembly between the driving device and the curtain shaft, and a switching device for regulating opening of the curtain up to a given length, having a blocking piece a gliding plate, which is engaged with an outer thread of the driving device and longitudinally glides thereon when the driving device rotates, so that, when the curtain is lowered, the gliding plate glides towards the blocking piece until a limit position is reached at which a contact switch on the gliding plate is operated, stopping the motor.
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