An object of the present invention is, in an image-forming machine equipped with plural paper feeders that feed paper to a drum unit at different paper feed speeds due to the difference in the shapes of paper traveling routes, to control the image-forming machine so as to select a paper feeder suitable for the condition of printing-speed-priority. A stencil printing machine has three paper feeders; a paper feed table, a first tray, and a second tray. The maximum allowable printing speeds to a drum unit of the three paper feeders: differ from each other in accordance with the difference in the shapes of traveling routes; increase in the order of the paper feed table, the first tray, and then the second tray; and are stored as data. When a user carries out printing at the setting of speed-priority, a control unit of the machine and a paper feeder selection device select the paper feeder of the highest maximum allowable image-forming speed and carry out the printing.