Roof system for a vehicle comprising a sunshade assembly

A roof system for a vehicle including a sunshade assembly, which comprises:

• a flexible sunscreen having opposed longitudinal edges and opposed transversal edges;
• a winding shaft carrying a rotatable winding roller configured for winding and unwinding the sunscreen at a first one of its transversal edges, the winding roller being provided with an internal spring connected between the winding roller and the winding shaft and being preloaded to wind the sunscreen thereon;
• an operating beam connected to a second one of the transversal edges of the sunscreen;
• two drive parts extending along and capable of a movement parallel to the longitudinal edges of the sunscreen, wherein the drive parts are driven by a corresponding drive and are connected to opposite ends of the operating beam for moving the operating beam it to wind and unwind the sunscreen;
• and
• a rotatable drive member positioned at only one end of and concentrically fixed to the winding shaft and being drivably in engagement with one of the drive parts, such that a displacement of said one of the drive parts results in a rotation of the winding shaft in a same direction as the winding roller.