An automated document processing apparatus comprising a detector; a plurality of pockets; and a pocket selector gate assembly which causes a document being processed by the apparatus to be routed to one of the plurality of pockets based on information read from the document by the detector, the route of the document being determined by the position of a pocket selector gate, the pocket selector gate position being controlled by a motor which is mechanically coupled to the pocket selector gate, the mechanical coupling being such that, when the pocket selector gate is in a first position, the pocket selector gate is locked in place even after the motor has been deenergized. The mechanical coupling may be achieved by way of a link arm and pin, the pin mating with the link arm and engaging a mating slot of the pocket selector gate.