Abstract: A printing apparatus has a printing cylinder rotatably supported by a main frame. A subassembly contains a plurality of anilox rolls rotatable about parallel spaced-apart axis with the subassembly being rotatable about an axis parallel to and between these spaced-apart axes. A locking arrangement secures the subassembly in selected positions whereby any selected one of the anilox rolls can be brought into an operative position for cooperating with the printing cylinder for printing. Alternative ink systems supply ink to the selected anilox roll when in the operative position. Preferably the subassembly is supported at its ends by gear casings which are adjustably rotatably mounted in a subframe which itself is pivotally mounted in the main frame. The ink rolls may be anilox rolls with different surface screens.

Abstract: A lead edge sheet feeder, particularly for corrugated paperboard sheets, has an endless belt transfer section downstream of a control gate. This endless belt is driven at constant speed and at least first and second vacuum boxes are disposed successively along the transfer belt. Both vacuum boxes are continuously connected to a vacuum source. Each vacuum box has an open face which has to be completely covered by the sheet being fed before that vacuum box is effective in drawing the sheet against the transfer belt. There may be a third vacuum box, and vent holes may be provided in a common partition between the third and second vacuum boxes. The feed section, upstream of the control gate, may have modes for long and short sheets, in the shorter sheet mode less length of sheet being contacted by a feed conveyor.