Abstract: The information carrier is periodically applied to a platen which is preferably rotatable. The apparatus comprises in known manner a rotary stamp for printing information on the information carrier when this carrier moves between the platen and the stamp. The platen has at least one groove with two edges and a bottom situated between planes which bound at least an annular stamp surface carrying the printing faces, a part of the periphery of the stamp extends into the groove without touching the edges, and reset means urging the stamp and the platen towards each other. In accordance with the invention the inking device is arranged in the groove, said reset means urging the periphery of the stamp against the inking device in the absence of an information carrier.The invention is employed in cheque readers and stamping machines.

Abstract: A matrix printer comprising one or more identical groups of printing wires which are guided in ducts in stackable plates of synthetic material. In the case of a plurality of stacked groups, the distance at the area of the printing ends of the wires between two adjacent ducts in two different groups equals the distance between two adjacent ducts of the same group. Different paper widths can be accomodated and characters of different dimensions, curves, patterns and so-termed negative characters can be printed without movement of the groups.