Where product movement must be more accurately controlled, cam-adjustable live roller conveyors provide effective low cost versatility for a variety of material handling applications. With unique design, the driving force of the conveyor is easily adjusted at any point along the conveyor. By simply adjusting individual pressure rollers, the conveyor can provide efficient station-to-station transportation or low-pressure accumulation. At merge/ diverge points, as in transferring loads between main and auxiliary lines, this pressure can be increased for more positive driving action.