A conveyor includes a plurality of belt support assemblies each having a drive wheel assembly at one end and an idler wheel assembly at the other end. Each of the drive and idler wheel assemblies includes a motion converter for converting the rotational movement of a shaft into linear motion along the shaft and an actuator for selectively engaging the motion converter and the shaft. A controller controls the operation of the shafts and the actuators to selectively and individually control the location of each end of each belt assembly relative to one another and to a centerline of the conveyor.