Abstract: A mixing machine including a frame; a first roller rotatably supported by the frame; a second roller rotatably supported by the frame in a position parallel to the first roller and closely adjacent thereto so as to facilitate compression of material therebetween; a rotary drive mounted for reciprocating movement on the frame in a direction substantially parallel to the first roller; and a reciprocating drive for producing the reciprocating movement of the rotary drive. Also included is a mixing roller operatively coupled to the rotary drive so as to be rotated thereby, the curling roller including an outer end disposed for movement with the rotary drive means along a path closely adjacent to the first roller and extending between outer and inner surface portions thereof so as to move material on said first roller from the outer portion thereof toward the inner portion thereof.