Abstract: An apparatus is disclosed for transferring sheet material from a receiving station to a stacking station. A vertically reciprocative roll case is mounted to a stationary main frame by airsprings. Horizontally reciprocative transfer arms mounted on the main frame between the parallel rolls of the roll case, extend to transfer a sheet assembly to an adjacent stacking station when the roll case drops to a level below such arms. Stacking arms extending between but below the extended transfer arms are cantilevered from a vertically movable carriage on a support frame and receive the sheet assembly when the transfer arms retract. Accumulator arms parallel to and vertically aligned with the stacking arms are carried by a separate carriage movable vertically on the support frame. The stacking arms index downwardly a short distance upon receipt of each sheet assembly from the transfer arms.

Abstract: Multiple cutting discs are fixed in spaced-apart positions on each of two side-by-side counterrotating shafts so that peripheral portions of the discs on each shaft extend into the spaces between discs on the opposite shaft. Each disc has a smooth cylindrical peripheral surface which meets opposed sidewalls at sharp continuous cutting edges. The clearance between adjacent discs on opposed shafts is small so that their cutting edges coact to shear material fed into the bight between opposed counterrotating discs in their feed-through direction. Removable infeed teeth project from the peripheral surface of each disc at circumferentially spaced positions to help feed material into the bight between opposed discs. Material shredded by the discs falls onto a slowly rotating screening drum encircling the disc assembly. The smallest shredded pieces pass through such drum onto a discharge conveyor.

Abstract: Multiple cutting discs are fixed in spaced-apart positions on each of two side-by-side counterrotating shafts so that peripheral portions of the discs on each shaft extend into the spaces between discs on the opposite shaft. Each disc has a smooth cylindrical peripheral surface which meets opposed sidewalls at sharp continuous cutting edges. The clearance between adjacent discs on opposed shafts is small so that their cutting edges coact to shear material fed into the bight between opposed counterrotating discs in their feedthrough direction. Removable infeed teeth project from the peripheral surface of each disc at circumferentially spaced positions to help feed material into the bight between opposed discs. Material shredded by the discs falls onto a slowly rotating screening drum encircling the disc assembly. The smallest shredded pieces pass through such drum onto a discharge conveyor.

Abstract: A machine for manufacturing "sleuters" or other articles of folded plasterboard is described. Sleuters are employed as spacers or risers between stacks of plasterboard or other sheet material and have the advantage that they do not physically mark or discolor such plasterboard, as conventional wooden sleuters sometimes do. Plasterboard remnants are cut to a standard length, and then conveyed intermittently between work stations where they are scored to provide fold lines, folded into two pleated members while simultaneously breaking such members apart from each other, and then stapled. The folding apparatus includes upper and lower folding arms which are moved toward the plasterboard and pivoted to fold and break such board into the two pleated members. The pleated plasterboard members are transmitted from the folding section through a guide to compress them while their layers are stapled together to form the completed sleuter.