Computer-aided cam design of high-speed under-table swing-arm gripper system in sheet-fed offset press

By analyzing various kinds of gripper systems of different sheet-fed offset presses, the under-table swing-arm system, with a fixed axis, has the advantages of meeting high-speed press running requirement, keeping longer dwell time of printing sheets, helping improve print registration, and hence in favor of assuring HIFI print quality while having high press output. The CAD conjugate cams, which control the double swing-arm 4-bar linkage, determine the swing motion of high-speed gripper system. The formulas of gripper-swing-arm´s motion needed for the conjugate cams´ CAD are derived in this paper.