Pull-cord control device for curtain without operation cord

A pull-cord control device for a curtain without an operation cord, comprising:

• a pull-cord;
• a base forming at least one first friction shaft;
• and
• a pressing plate rotatably mounted to the base through a rotation shaft, and forming a pressing portion that cooperates with the base to clamp or loosen the pull-cord;
• wherein the at least one first friction shaft extends from a side of the base facing the pressing portion, the pressing portion forms at least one second friction shaft staggered with the at least one first friction shaft, the at least one second friction shaft extends from a side of the pressing portion facing the base;
• wherein an end of the pressing plate forms a fixing pole, a first end of the pull-cord is connected to a retractable-cord device of the curtain, a second end of the pull-cord extends between the at least one first friction shaft and the at least one second friction shaft, and is connected to a curtain body of the curtain after extending about the fixing pole in a direction from the first end to the second end;
• and
• wherein when the curtain body moves up and down, the pressing portion is actuated by the pull-cord to rotate about the rotation shaft relative to the base between a clamping position and a loose position;
• when the pressing portion is in the clamping position, the at least one second friction shaft actuates the pull-cord to travel through the at least one first friction shaft and the at least one second friction shaft in an S-shaped path.