Outfeed Conveyor (Roll Case) Cone Machinery Outfeed Roll Cases feature a center chain that carries the cants to a secondary sawing machine (usually a vertical edger). Press rolls sequence along the length of the chain, keeping the cants on center. ? Side boards travel on bed rolls with spiral wrap until they bump into shear panels near the end of the roll case. The bed rolls screw the side boards off of the roll case where they drop onto floor chains and head for a board edger.