Conveyor assembly and method for conveying a substrate carrier

A method for conveying a substrate carrier, comprising:

• providing a substrate carrier configured for carrying at least one substantially planar substrate;
• conveying the substrate carrier along a processing track;
• conveying the substrate carrier along a return track;
• rotating the substrate carrier around a substantially horizontal axis from a first orientation into a second orientation;
• and
• conveying the substrate carrier along the return track in the second orientation;
• rotating the substrate carrier around a substantially horizontal axis from the second orientation back into the first orientation;
• conveying the substrate carrier along the processing track in the first orientation,
• wherein the rotation of the substrate carrier from the first substantially horizontal orientation to the second orientation, and/or vice versa, involves a rotation through an angle from about 70 to about 120 degrees;
• wherein the processing track is disposed substantially above or below the return track;
• wherein the substrate carrier is rotated from the first orientation to the second orientation between an endpoint of the processing track and a starting point of the return track, and wherein the substrate carrier is rotated from its second to its first orientation between an end point of the return track to a starting point of the processing track such that the substrate is transferred from the processing track to the return track, and/or vice versa by said rotations between the first and second orientations.