Abstract: An image forming apparatus of the present invention includes an image carrier. A rotary developing device adjoins the image carrier and includes a plurality of developing sections for developing a latent image formed on the image carrier with a magnetic developer. A toner cartridge unit includes a plurality of toner cartridges and is rotatable integrally with the developing device. A plurality of toner conveying device each connect one toner cartridge to the associated developing section and each include a toner passage and a toner conveying member disposed in the toner passage. A magnet adjoins a toner outlet, which is formed in the toner passage and communicated to the developing section, for forming a magnetic field that traverses the toner passage over the entire diameter of the toner passage. Toner stored in each toner cartridge is prevented from unexpectedly flowing into the associated developing section when replenishment is not effected.

Abstract: A printing apparatus in accordance with the present invention includes: a plurality of replaceable ink ribbons each having a ribbon end indicating an end of the ribbon; a printer for printing an image by using the ink ribbons while scanning printing paper; a detector for detecting any ribbon end of the ink ribbons; a stop device responsive to a detection output of the detector for stopping operation of the printer; a storage device for storing a stop position of the stopped printer; an instructing device for instructing restart of printing after replacement of the ink ribbon having the detected ribbon end with another ink ribbon; and a control device responsive to an instruction output of the instructing device for controlling the printer to restart printing by using the replaced ink ribbon based on the stored stop position.