In rotary presses, the plates are fastened around cylinders. These cylinders continuously turn against an endless conveyance of moving paper, printing the paper sheet as it moves past. The sheet can be printed on both sides, cut, folded, and tied up so that it comes out as stacks of finished newspaper. Fabrics are also printed on large machines in which cylinders turn against the cloth, printing colored designs on it.
In the case of cylinder presses, a flat type bed slides back and forth beneath a turning cylinder to which a paper sheet is attached. Grippers hold the sheet of paper in place against the turning cylinder before releasing it, and picking up another sheet.
Science EncyclopediaScience & Philosophy: Positive Number to Propaganda - World War IiPrinting - History Of Printing, The Gutenberg Revolution, Conventional Printing Methods, Letterpress, Large Presses, Printing Pictures - Photogravure, Dot-matrix printers