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A conveyor for carrying documents or envelopes comprising an endless flexible belt provided with spaced carriers in the form of metal rods with multiple bends moving along ribbed or grooved supporting surfaces, the belts being also formed with spaced teeth to engage toothed driving sprockets, so that the positions of the conveyed articles are accurately determined. Below the supporting surface sorting boxes are located each with a diverter gate movable into the path of the travelling articles, and a number of such conveyors are positioned end-to-end to transfer mail from one to the next. Each of the carrier rods can twist about its axis and has an opaque blade at one end arranged to interrupt a light beam and so produce an optical signal to stop the conveyor if an item of mail becomes jammed.