Abstract: The board turner apparatus and method is capable of turning a board over several times for repeated inspection of both sides of such board for more accurate grading of such board before allowing the board to be conveyed forward past a retractable stop. The retractable stop means when extended above the conveyor engages the leading edge of the board at a fixed stop position along a conveyor means and keeps the board from advancing along the conveyor means until such stop means is retracted. The board inverter means includes a plurality of curved turner arms which pivot about the axis of a common support shaft between a lowered position below the upper surface of the conveyor and a raised position above such upper conveyor surface.

Abstract: A tube for an impinging jet air drier for wood veneer has a circular cross-section throughout 270 degrees of its circumference, the remaining 90 degrees comprising two planar portions, one disposed perpendicularly to the direction of travel of a sheet of material through the drier, the other generally facing the sheet of material but forming an obtuse angle with the first portion at a line of juncture disposed in the downstream direction of sheet travel. A plurality of round holes are punched in the planar portion facing the sheet of material. The holes are disposed in rows parallel to the longitudinal axis of the tube. The shape of the tube serves as a guide for the sheet material while discharging air thereacross. The configuration permits the upper tube in each pair to be disposed about 5/8 inch above the plane of travel of the sheet material and the lower tube to be disposed about 3/8 inch therebelow.