Abstract: A portable mixer has a bin with a number of augers rotatably mounted therein. The augers have forward flights, for conveying roughage feed material, such as hay, in a forward direction, and reverse flights, for conveying the feed materials in an opposite direction. The augers mix feed material introduced into the bin and convey the feed material to a discharge opening. At least one of the augers has a ribbon flighting positioned at an outer peripheral edge of the auger flighting. The ribbon flighting has an outer edge having a continuous saw-tooth cut. The relatively small, closely spaced teeth of the saw-tooth edge cuts the elongated fibrous material, such as hay, without increasing the torque required by the auger. The ribbon flighting is formed from a number of separate, identical ribbon flighting members positioned in series along the outer peripheral edge of the auger flighting.

Abstract: A mixing apparatus in which parallel augers are located in a box. The upper mixing augers have specially shaped flighting which provides straight edges linked by corners rather than the conventional helical edge. The lower conveying auger is a helically edged auger with notches at intervals along the edge providing radially oriented surfaces which assist in engaging the material.The flighting of the special straight edged augers is produced from a square blank of sheet metal by pressing it into the spiral configuration required and attaching it to the auger shaft. The complete flighting is made up by several such sections joined end to end.