US Patent 7283283 Methods and system for inline digital printing

A friction driven printing device capable of delivering high-resolution images on the vertical surface of corrugated boxes, shipping cases, chip board, and the like, has a print cylinder assembly that is housed in a print carriage that is mountable on a conveyor line. The print cylinder has a wall that is perforated and includes a stencil and a screen mounted on the print cylinder. Ink from an ink cartridge is pumped into the print cylinder via an ink feed tube and deposited in the print cylinder. A roller squeegee is used to meter the ink uniformly across the print area of the print cylinder and ultimately onto the printer substrate.