also a spare reel are located a conveying roller 1 which can be driven by motor and alternatively manually is provided in the lower region and an actuating element 7 for the manual drive is arranged on the lower side the figures show in detail only those parts of the different driving units of a paper dispenser that are required for understanding the present invention these include a region of the dispenser housing 5 in which the conveying roller 1 and the drives which can be alternately used are held and mounted the conveying roller 1 preferably contains a knife arrangement which is actuated by rotation of the conveying roller 1 and cuts off sheets from the non illustrated paper web the paper dispenser is normally driven by a motor 23 which is set into motion in particular contactlessly after recognizing a user by means of a suitable proximity sensor and issues a sheet or a predetermined number of sheets if a malfunction occurs for example when the power supply is interrupted batteries are too weak a paper jam occurs etc the motorized drive can be decoupled from the conveying roller 1 and replaced by a manual drive in the exemplary embodiments illustrated in the drawings only a single actuating element 7 is required for the changing over from motorized drive to manual drive and for the manual continued rotation of the conveying roller 1 the actuating element being displaceable on the lower side of the dispenser housing 5 counter to a restoring spring 8 in the embodiments according to fig1 to 5 the conveying roller 1 has at one end two toothed rings 3 4 which are arranged offset axially and differ in diameter the toothed rings 3 4 form a first.