Curved roller blind with abutment for a spring

The roll-up window blind (17) for motor vehicles has a rigid axis upon which is rotatably mounted a shaft consisting of at least one tubular section and a cap which has a fixed bearings so that the cap is rotatable. Coupling means connected the shaft sections to the cap in a torsionally fixed manner. A roller blind (18) is fastened by one edge to the shaft, and a spring drive is incorporated in the axis, with the anchored end fixed in the axis and the other end connected to the cap in a torsionally fixed manner.