Winding mechanism for a sun screen and sun screen provided therewith

There is provided a winding mechanism for a sun screen (1) having two opposite lateral edges which are provided with profiles (2,3) that are slidingly housed in corresponding guides (4,5) extending along said lateral edges of the sun screen (1), comprising a winding tube (6) being rotatably mounted about a central axis (7), and further comprising driving means for said winding tube (6). The winding tube (6) is longitudinally movable relative to the central axis (7), for example as a result of its central axis (7) including an angle ( alpha ) with the transverse axis (12) of the sun screen (1).