Idlers
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Idlers are used to take up extra belt length and provide adjustment for tensioning belt drives. Idler pulleys and sprockets can be valuable belt drive components. Idler pulleys and sprockets can alter belt paths, make the belt clear obstructions, or apply belt pre-tension. Idlers may remain in a fixed location, or may be adjustable to allow belt pre-tensioning and take up. Idlers may be applied to either the inside or backside of belts. Inside idlers may consist of sprockets, pulleys, sheaves, or flat pulleys. Backside idlers are generally flat.