Guide idlers are also called stub idlers, limiting idlers, track-guiding idlers. Guide idlers are are designed to prevent belts from tracking off. usually by contact with the edge of the belt. They can be used on both the trough and return side of the conveyor belt. The problem with many guide idlers is the design itself. A conveyor belt can quickly wear down the steel of the guide roll to make it unusable.
Guide rollers are also called stub rollers, limiting rollers, track-guiding rollers, snub rollers or lateral guide rollers. Guide Idler and Conveyor Belt Tracking Guide, was developed during the 1940's to assure reliable Belt Conveyor Tracking in the following industries: Guide idlers are properly mounted at the sides of the belt so that they keeping it aligned if there are run outs. Continuous belt rubbing against the guide idlers might cause damage (edge wear) of the belt. In that case further check of the conveyor items (pulleys, idlers, etc) and structure should take place. Guide idlers are available in various diameters and lengths.
Guide Idler usually use ball bearing.