Window roller blind for curved or non retangular window panes

Window blind comprises a winding shaft device (24, 25), a blind material (14) having longitudinal edges (18, 19) running parallel to the operating path, guide rails, guiding units guided into the rails, drive units for moving the blind material and an assembly frame. Preferred Features: The blind material is made from an elastically deformable material and is formed by two parts of material (15, 16).