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The roller chain runs on rotating sprockets linked to the motor that drives the chain. In most roller chains, there are two types of hyperlinks utilized alternately to make it function. Inner be part of (also known as roller join): The two interior plates are joined collectively by two sleeves or bushings below the two rollers. Outer ring (also known as pin ring): The two outer plates are pinned jointly, by means of the bushing of the inner ring.