Abstract: A curtain control device has a stroke setting device and a damper respectively assembled at both ends of a curtain spindle rod. A torsion element is further assembled on the curtain spindle rod. A curtain spindle sleeve is invaginated on the outside of the curtain spindle rod, the stroke setting device and the damper. The curtain spindle sleeve is assembled with the combination of the curtain spindle rod and the damper, and then a curtain fabric is assembled on the outside of the curtain spindle sleeve. In this manner, the opening range of the curtain fabric roll is controlled by the stoke setting device, and the roll-up speed of each part of the curtain fabric is slowed down by the damper so as to reduce effectively the noise produced by the quick actuation of each part and the defective rate.

Abstract: A roll screen control member is revealed. The roll screen control member consists of a sprocket wheel, a chain protection cover, a sprocket support, a cover spring, a splined bush and a central pin. The splined bush is mounted with a roll screen tube while the central pin includes a central pin head with a plurality of cutting surfaces. After the central pin being locked into the sprocket support, each cutting surface of the central pin is corresponding to each cutting surface on the sprocket support. When a chain is pulled, due to the precise locking between the central pin and the sprocket support, splined bush is moved along with the cover spring so as to drive the roll screen tube to rotate along with the movement and further control extension or retraction of the roll screen.