US Patent 7331284 Multi-drum stencil printer with duplex printing sections

A stencil printer includes at least an upstream and a downstream printing section, as seen in the direction of sheet conveyance, each including a print drum and a press roller for pressing a sheet against the print drum. An intermediate conveyor, positioned between the upstream and downstream printing sections, conveys the sheet from the former toward the latter. A dual master, formed with a first and a second image, is wrapped round the print drum of the upstream printing section. This printing section includes a refeeding device, a path selector, and a switching device.