Abstract: A conveyor having a series of rollers in longitudinally spaced relationship along the length of two conveyor side rails, each roller extending across the space between the side rails. Each of the rollers has a drive gear mounted at one end. A set of idler gears is provided, each positioned so as to intermesh with adjacent drive gears, thus transmitting power to all of the rollers in the series. The rollers are readily removable through a slot in the top of each side rail, thus enabling convenient, independent replacement of each roller. The idler gears are mounted on shafts, which in turn are mounted in bearings bolted to the side rails. The idler gears and shafts are also readily removable individually without requiring removal of any other rollers, drive gears or idler gears. The shaft of one roller in the series is considered a main drive shaft and is coupled to a power unit. The conveyor is provided in discrete lengths so that it is usable in modular form.