Fast positioning structure of safe position limiting device of roller blind

A fast positioning structure of a safe position limiting device of a roller blind, comprising:

• a controller having an axle rod, wherein the axle rod is further provided with a through hole;
• an axial rail limiting assembly having a screw member, an elastic member, and an inner tube, wherein the screw member is provided with an axle hole on a first end surface thereof for engaging with the axle rod for positioning, and a first chamber in a second end surface thereof for allowing corresponding insertion of the inner tube and horizontal movement of the inner tube therein, and wherein the inner tube is provided with a central through hole on an end surface thereof and a second chamber therein for communicating with the central through hole and accommodating the elastic member;
• a touch member for correspondingly inserting into the central through hole of the inner tube, the elastic member, the screw member and the through hole in the controller for positioning and for compressing the elastic member to limit the inner tube within the first chamber of the screw member or release the inner tube for horizontal movement;
• and
• an outer sleeve tube having an inner tooth ring for correspondingly screwing at an external of the screw member and a seal cap at one end thereof, wherein an end surface of the seal cap is provided with a locking structure corresponding to a locking structure on the end surface of the inner tube for correspondingly locking the inner tube in the outer sleeve tube or separating the inner tube from the outer sleeve tube.