Abstract: An apparatus for splitting a wood board into two separate sheets, comprising a pair of parallel drive shafts rotatable in the opposite directions, a series of toothed wheels fixed on each of the drive shafts at a predetermined spaced interval, each toothed wheel having on the circumferential periphery thereof a number of teeth incisingly engageable with the board, the toothed wheels on one of the drive shafts being disposed radially in alignment with the toothed wheels on the other drive shaft, respectively, a knife having a cutting edge positioned and directed to split the board from end to end into two separate sheets. The tip end portions of the teeth of each two radially aligned toothed wheels is formed to be positioned in an offset relation in the axial direction of the drive shafts by forming the tip end portion to have at least one surface which is bevel or oblique with respect to a plane extending radially of the toothed wheel.

Abstract: A machine for cutting grooves in workpieces, particularly in sheet form, having at least one fixed cutter, support means for supporting the workpiece against the cutter and means for moving the workpiece relative to the cutter and support means. The cutter has a cutting edge defining the shape of groove to be cut and is arranged to slice through the workpiece to produce a groove leaving a constant thickness of material between the bottom of the groove and the other side of the workpiece. The forces tending to lift the workpiece from its support due to the action on the cutter of material removed thereby are overcome and a resultant force operating to press the workpiece on to its support is produced by arranging, either singly or in combination, thatA. the cutter has a cutting edge substantially contained in a plane which extends forwardly in the direction of relative movement of the cutter and upwardly of the surface of the workpiece,B.