Abstract: The paper stacker includes a pair of pivoted generally L-shaped elements disposed above a vertically movable paper tray. The elements pivotally depend such that their lower paper support legs are normally inclined and terminate at free edges in a roller. Upon upward movement of the tray and stacking initial sheets of fan-folded paper on the tray, the sheets engage the undersides of the elements to pivot the elements and, hence, the lower legs into generally horizontal positions whereby paper may be stacked on the horizonally disposed support legs of the elements. Upon reaching a predetermined stack height, the tray moves downwardly away from the elements, enabling the paper carried thereby to fall through the opening onto the tray.