Abstract: A document stacking module comprises a rotatably mounted stacking wheel (10) having at least one generally radially outwardly extending slot (14-16) which can be aligned with a document delivery position so as to receive a document. The wheel (10) is rotatable to a stacking position where the wheel cooperates with a stripper member (19) to extract a document from the slot whereby the document is stacked at the stacking position. A motor rotates the stacking wheel (10). A control system controls operation of the motor. The outer surface of part (22) of the stacking wheel (10) is shaped so that, when said part is presented to the document delivery position, the document fed through the document delivery position towards the stacking wheel engages the shaped part of the outer surface of the stacking wheel and is diverted away from the stacking wheel.