Conveyor belts sometimes tend to drift laterally for a variety of reasons. In these cases, a vertical roller with a cantilevered spindle can be used to limit the problem, often called a belt guide roller. These special rollers for conveyors allow continuous and instant alignment of the belts despite the stresses due to transporting heavy objects. Installing guides for conveyors and providing conveyor belt alignment has many advantages. Their use allows delivery systems to operate more efficiently, longer, and safely. Keeping the belt running correctly helps to avoid the risk of slipping when the operator is conveying materials during operation and reduces the waste of resources. Of course, this also reduces belt downtime and unplanned maintenance interventions. As a final follow-on advantage, using guide rollers in conveyors can significantly improve the output and profits of related industries. However, special attention should be paid to the use of such idlers on the idler conveyor so as not to damage the belt edge due to the force of the belt on the guide. In other words, the guide roller can not eliminate the real cause of belt deviation; Therefore, the belt may cross the guide roller or deform on the guide. For these reasons, it is recommended to always use guides on so-called self-aligning beams, which rotate automatically when the belt is off the center of the conveyor and corrects itself.