<p>A conveyer system is provided having a first and second plates (6), (9) ; a first guide roller (7) for engaging a collar bead (10) on a first side of the belt (2) and mounted on the first plate (6) ; a second guide roller (7') for engaging the collar bead (10) on a second side of the belt (2) and mounted on the second plate (9), the second plate (9) rotatable with respect to the first plate (6) to engage and disengage and second guide rollers (7') from the second sides of the belt (2).</p>
