Abstract: A system for coding flat objects, in particular letters, comprises a manual coding station to enable a human operator to print coded indications on flat objects that a conveyor moves before him, using a printer. An optical addressing information reader on the upstream side of the manual coding station is adapted to control the printing of coded indications appropriate to information previously marked on the objects that it is able to recognize. A switching device on the path of the conveyor on the downstream side of the optical reader is used to route the objects to the printer from the optical reader either directly or via the manual coding station, where the operator controls the printing of coded indications appropriate to information previously marked on the objects marked on the objects that he is able to recognize.

Abstract: An unstacking device for objects such as mail envelopes is of the type comprising a magazine for storing and feeding stacked objects and a discharge head for separately removing jogged objects from a stack. The device is provided within the terminal portion of the magazine with a transition edge guide which serves to restore inclined objects to a practically upright position for subsequent discharge and is inclined with respect to the direction of feed motion of stacked objects and with a jogging reference edge guide which is relatively displaced towards the exterior of the magazine. There are associated with the edge guides a feed screw for advancing objects and a delay screw for retarding objects, the screws being interposed between jogging rollers opposite to the edge guides.