Abstract: Disclosed is a roller blind allowing an upper position limit and a lower position limit to be set by the damper of the roller blind. The damper allows the upper position limit and the lower position limit to be set and includes an inner tube, a first sliding base, a first position-limiting base, and a second position-limiting base. When a blind fabric is driven by a linkage assembly, the first sliding base is driven by the linkage assembly and ends up pushed against the first position-limiting base or the second position-limiting base to stop the linkage assembly from driving the blind fabric. The blind fabric can therefore be limited in position whether it is raised or lowered.

Abstract: A roller and an insert plate-assisted roller securing device are provided. The insert plate-assisted roller securing device includes a wheel-shaped cover, an outer cover, and a bracket. The outer cover has a supported portion with different widths in different directions, and the supported portion can be engaged in the bracket without separating from the bracket. As the outer cover can be coupled to the bracket along with the roller by a single person, installation of the roller is made easier and less time-consuming than before.