Apparatus for prefeeding sheets of paperboard products
 An improved prefeeder assembly for shingling sheets of planar material in which a sheet stack is positioned on a prefeeder lift conveyor which lowers the sheet stack into a floor pit to incrementally elevate the sheet stack. A block pusher assembly sequentially pushes block segments to a conveyor assembly where a shingling assembly shingles the sheets. A bottom sheet removal assembly having an in-path diverter plate contacts and diverts only the bottom sheet of the bottom most block segment as this block segment is being shingled. As shingled sheets are discharged to other process equipment, a tamping assembly actuated by balloon cylinders serve to tamp the sheet edges for uniform restacking. 
ASC Machine Tools, Inc.
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Terry B. Hugh F. Jon P. Terry M.
Smith Moran Drake Frost