An impression device for a parallel printer, in which a row of characters or digits is imprinted by a row of types, has an impression member with a convex curved impression surface rocking on a copy sheet and on an inked ribbon covering the row of types so that imprints of the characters are made. The rocking motion of the impression member is obtained by alternately moving the ends of the same toward and away from the row of types after a frame carrying the impression member, has been rapidly moved to a position in which one end of the impression member abuts the sheet.
A rolling parallel printer in which a pressure element is driven through a swiveling motion each printing cycle and a pressure segment thereof rolls off a line of type. The pressure element is connected to a mechanical linkage which minimizes the sweep of travel of the pressure element, while maintaining the pressure element sufficiently far from the type in a rest position to facilitate reading of the printed matter.
