DEVELOPING DEVICE FOR ELECTRONIC PHOTOGRAPH PRINTING APPARATUS, NON-PICTURE PORTION TONER REMOVING DEVICE, ELECTRONIC PHOTOGRAPH PRINTING APPARATUS USING THOSE DEVICES, ELECTRONIC PHOTOGRAPH PRINTING METHOD, AND GLASS/CERAMIC PLATE MANUFACTURING METHOD

摘要

A developing device for an electrographic printing apparatus provided has stable performance and improved printing quality. The developing device (5) for the electrographic printing apparatus (1) includes a supplying channel (37) having at least one stirring/delivering roller (27) for stirring and delivering a carrier and a toner charged by contacting the carrier; a developing roller (25) for supplying the toner adhered to the carrier to a supplying position of an electrostatic latent image on the photoreceptor (3), the developing member being disposed on a photoreceptor side of the supplying channel (37) and having a outer surface (47) that moves circumferentially and attracts the carrier; a collecting unit for collecting the carrier from the outer surface (47) at a position downstream of the supplying position in the moving direction of the outer surface (47); a collecting channel (39) for delivering the carrier collected at the collecting unit and circulating and supplying the carrier to the supplying channel (37); and a toner-concentration adjusting device (35), provided in the collecting channel (39), for adjusting the ratio of the carrier and the toner delivered through the collecting channel (39) to a predetermined value.