Arrangement for supplying ink to the printing plate of a printing press

摘要

An inking system for a lithographic printing press in which the plate has a non-ink accepting column position. Ink from an ink fountain is conveyed to the plate over its full width by a series of roller elements including an ink drum and ending with a form roller which is in rolling engagement with the plate. Water from a water fountain is conveyed to the plate by a series of rollers ending with a water form roller. A sub-frame is positioned at the non-ink accepting column position. The sub-frame mounts a pair of guide rollers supporting a relatively narrow endless belt in an elongated loop, the belt presenting a flat ink-accepting surface. A relatively narrow roller segment couples one end of the loop to the plate while the other end of the loop is coupled to the ink drum so that the belt forms an ink "bridge" on the downstream side of the series of ink rollers. Thus any ink which may become emulsified and which may therefore be deposited on the plate in non-ink accepting areas is picked off of the plate and conveyed by the belt back to the ink drum. In the preferred embodiment the narrow roller segment is journalled in a pair of arms which are swingable on the sub-frame about the axis of the adjacent one of the guide rollers with provision for adjusting the pressure exerted by the roller segment against the plate on the plate cylinder.