Roller blind for motor vehicles, with anti-jamming means

The blind has a blind fabric (11) whose one end is integrated to a roller tube and another end is integrated to a drawing rod (13), where the rod is guided between guiding rails in a sliding manner. The drawing rod is driven by driving elements (151, 152) e.g. cables. A portion of one of the driving elements circulating at an interior of the drawing rod carries blocking bases (41, 42). The blocking bases are in contact with one of return pulleys (171, 172) for immobilizing the blocking bases in case of blocking of the drawing rod.