Abstract: A drive mechanism for a conveyor of printed circuit board processor includes a first roller mounted for rotation about a first axis and a second roller mounted for rotation about a second axis that is generally parallel to the first axis. The first and second rollers are shaped so that they form a guide groove therebetween when they are disposed adjacent one another. The rollers grip the printed circuit board in the guide groove and assist in supporting the printed circuit board in a vertical orientation. Rotation of the first and second rollers drives the printed circuit board in a horizontal direction through the guide groove and toward the next drive mechanism along the processing path.