Dip coating system comprising a) at least one dip coating tank (1; 101) which can be filled with a treatment fluid, in particular with fluid paint, into which the articles to be coated, in particular vehicle bodies, can be dipped; b) a conveyor system (3, 10; 103, 110), which can displace the articles to be treated to the dip coating tank (1; 101), into the interior of the dip coating tank (1; 101), out of the dip coating tank (1; 101) and away therefrom and comprises: ba) at least one trolley (3; 103) which has a fastening device (7; 107) which can be rotated around an axis of rotation, to which fastening device at least one article can be fastened; bb) a rotating device (11, 12; 111, 112) with which the fastening device (7; 107) can be rotated in certain sections of the movement path of the trolley; bc) at least one driven traction chain (10; 110) extending parallel to the movement path of the trolley (3; 103); wherein c) the rotating device (11, 12; 111, 112) comprises: ca) at least one sprocket wheel (1; 111; 112) that can be connected to the fastening device (7; 107) in a rotation-locking manner which is arranged coaxial to the axis of rotation of the fastening device (7; 107); cb) at least one rotation chain (12; 112) which extends parallel to the movement direction of the trolley (3; 103) with which the sprocket wheel (11; 111) cams, wherein the rotation chain (12; 112) extends in the movement direction of the trolley (3; 103) over a section, in which a rotation movement should take place and wherein an adjustable coupling (14; 114) is provided, which in a first rotation direction does not establish a rotation connection between sprocket wheel (11; 111) and fastening device (7; 107) in a first position and establishes a rotation connection between sprocket wheel (11; 111) and fastening device (7; 107) in a second position, and the coupling (14; 114) has a third position, in which a rotation connection is established between the sprocket wheel (11; 111) and the fastening device (7; 107) in a second rotation direction opposed to the first rotation direction. a) at least one dip coating tank (1; 101) which can be filled with a treatment fluid, in particular with fluid paint, into which the articles to be coated, in particular vehicle bodies, can be dipped; b) a conveyor system (3, 10; 103, 110), which can displace the articles to be treated to the dip coating tank (1; 101), into the interior of the dip coating tank (1; 101), out of the dip coating tank (1; 101) and away therefrom and comprises: ba) at least one trolley (3; 103) which has a fastening device (7; 107) which can be rotated around an axis of rotation, to which fastening device at least one article can be fastened; bb) a rotating device (11, 12; 111, 112) with which the fastening device (7; 107) can be rotated in certain sections of the movement path of the trolley; bc) at least one driven traction chain (10; 110) extending parallel to the movement path of the trolley (3; 103); wherein ba) at least one trolley (3; 103) which has a fastening device (7; 107) which can be rotated around an axis of rotation, to which fastening device at least one article can be fastened; bb) a rotating device (11, 12; 111, 112) with which the fastening device (7; 107) can be rotated in certain sections of the movement path of the trolley; bc) at least one driven traction chain (10; 110) extending parallel to the movement path of the trolley (3; 103); c) the rotating device (11, 12; 111, 112) comprises: ca) at least one sprocket wheel (1; 111; 112) that can be connected to the fastening device (7; 107) in a rotation-locking manner which is arranged coaxial to the axis of rotation of the fastening device (7; 107); cb) at least one rotation chain (12; 112) which extends parallel to the movement direction of the trolley (3; 103) with which the sprocket wheel (11; 111) cams, wherein the rotation chain (12; 112) extends in the movement direction of the trolley (3; 103) over a section, in which a rotation movement should take place and wherein an adjustable coupling (14; 114) is provided, which in a first rotation direction does not establish a rotation connection between sprocket wheel (11; 111) and fastening device (7; 107) in a first position and establishes a rotation connection between sprocket wheel (11; 111) and fastening device (7; 107) in a second position, and the coupling (14; 114) has a third position, in which a rotation connection is established between the sprocket wheel (11; 111) and the fastening device (7; 107) in a second rotation direction opposed to the first rotation direction. ca) at least one sprocket wheel (1; 111; 112) that can be connected to the fastening device (7; 107) in a rotation-locking manner which is arranged coaxial to the axis of rotation of the fastening device (7; 107); cb) at least one rotation chain (12; 112) which extends parallel to the movement direction of the trolley (3; 103) with which the sprocket wheel (11; 111) cams,