Abstract: A conveyor unit comprises a conveyor carried by a movable support, which support also carries a conveyor drive. The conveyor drive is provided with a control including a light source and a detector cell for sensing the presence of an article on a predetermined region of the conveyor, and the conveyor drive is started and stopped in accordance with signals from the detector cell. A location bar which extends around the conveyor is used for connecting the conveyor unit with another such unit at either end or at the side thereof. The support also carries a services conduit which has an outlet enabling electrical power supply to be provided for the conveyor drive. The services conduit can be connected at each end with the services conduit of an adjoining conveyor unit.