An organic light emitting device is disclosed. A suction part 151 is provided with a suction port 81A in associating with the blow-off part 152. A second roller base opposes the first roller base. Teeth extending away from the housing are shaped in a fashion as to provide maximum agitation in surfaces such as grass, gravel and hard packed dirt. Relative movement between the stripper and mandrel separates the sections of the tube from the mandrel. Related information about the medium is obtained in accordance with the identification information read from the medium.