Patent attributes
A control device for Venetian blinds and a control method includes a position unit, a rope-control unit and a movement limit unit. The position unit is fixed in an upper rail. The rope-control unit consists of a wind wheel, a rope, an engage wheel and a clutch. The wind wheel is pivotally connected to the position unit, and the rope has one end fixed with the wind wheel and the other end hanging down for a user to handle. The rope rotates the wind wheel, and the engage wheel fits with the wind wheel and fixed with the hanging unit. The clutch is connected with and can be rotated by the wind wheel in a first direction, or the wind wheel and the engage wheel does not rotate together in case of rotation in a second direction. The movement limit unit has a lever member swung by the rope to engage with or disengage from the ratchet for the hiding unit to rise up or move down and be positioned stably.
