The axis of the head driving roller or the tail reversing roller is not perpendicular to the center line of the conveyor. The cloth of the automatic rice rolls machine will run off because the axis of the head driving roller or the tail diverting roller is not perpendicular to the center line of the conveyor, which causes the conveyor belt to run off at the head roller or the tail diverting roller, and the tightness of the conveyor belt on both sides of the roller is inconsistent when the roller runs off.