Abstract: A skew control mechanism for sheet material. Sheet material, such as corrugated paperboard, is slit into strips of various widths and the slit strips are then cut transversely into lengths by a cut-off machine. The cut sections are conveyed by an endless belt conveyor to a stacking mechanism, and to prevent skewing of the cut sections on the conveyor, a skew control mechanism is mounted for movement on the frame of the machine. The skew control mechanism includes a series of carriages located along each side of the machine and the carriages at each side are connected together by links, while transverse shafts are pivoted to carriages at opposide sides of the machine. A plurality of wheels are mounted for floating vertical movement about each shaft and the wheels ride on the upper surfaces of the cut sections.

Abstract: A backstop construction for a sheet stacking machine. The sheet stacking machine includes a vertically movable table to receive sheets to be stacked and a truck is disposed above the table and is mounted to move on the frame in a front to rear direction. A backstop is carried by a carriage that is mounted for movement on the truck, and the backstop is adapted to be engaged by the forward edges of the sheets as they are stacked on the table. Movement of the truck with respect to the frame of the machine will adjust the position of the backstop for various lengths of sheets, and the backstop can also be moved between a rear and forward position on the carriage, so that the entire length of the frame can be utilized to accommodate the shortest and longest lengths of sheets.