Door operator system

A door operation system for opening and closing an opening comprising:

• a door frame comprising a first frame section at a first side of the opening and a second frame section at a second side of the opening;
• a door arranged to be moved between a closed (C) and an open (O) position, the door being movably connected to the door frame;
• a drive unit mounted on the door, the drive unit comprising at least one motor arranged to move the door from the closed (C) position to the open (O) position and vice versa, and
• an elongated transmission member extending along at least one of the first side and second side of the opening,
• wherein the drive unit further comprises a driven transmission member in driving connection with the motor, the driven transmission member being movably connected to the elongated transmission member and arranged to interplay with said elongated transmission member for driving the driven transmission member along said elongated transmission member by the elongated transmission member at least partially wrapping around the driven transmission member,
• wherein at least one guide member mounted to the door is arranged to interplay with the elongated transmission member for guiding the elongated transmission member into contact with the driven transmission member,
• wherein the least one guide member comprises a sliding surface on which the elongated transmission member is configured to slide, wherein a width of the sliding surface is larger than a width of the elongated transmission member, wherein the elongated transmission member forms a guide track in the sliding surface shaped by wear of the elongated guide member against the sliding surface, wherein the sliding surface is rotationally fixed with respect to the door, and
• wherein the sliding surface has a curvature, which is configured to urge the elongated transmission member to flex and follow the curvature.