ABSTRACT
The belt is trained by adjusting the rollers near the location where it is wandering. Shifting the roller axis with respect to the path of the belt is commonly called knocking the rollers. The belt can be centred by knocking ahead the end of the rollers in the direction of belt travel. Knocking is to be done only if the belt makes good contact with all three troughing rollers. Any correction required should be provided with self-aligning rollers designed for reversing belts. Shifting the position of rollers may have benefits in belt training. Rollers knocked in all directions in an effort to train the belt create additional friction, resulting in belt cover wear and increased power consumption. The effect of tilting the roller is counterproductive on a reversing belt. Crowned-face pulleys provide a centralizing effect and make the belt to run true.
