Dust figure transfer type electronic copying machine

Abstract

Abstract PURPOSE:To remove foreign matter and toner charged to the opposite polarity contained in a recovered magnetic developer, by feeding a small diameter magnetic carrier and toner collected in a cleaning part, to a developing device through a magnetic carrying part having an opening for dropping the foreign matter. CONSTITUTION:A photoreceptor 1 is electrically charged 2, exposed to light 3, and after that is developed by using a developer consisting of a small diameter magnetic carrier having >=10<13>OMEGAcm resistance, and an insulating toner, and applying the bias of the same polarity with a latent image, to a sleeve 10, and the toner and the carrier are make to adhere to a image part and a non-image part, respectively. In the transfer part, only the toner is transferred on a paper, an untransferred toner and the carrier gas recovered by a cleaning device, and are carried to a developing device by a carrying member 19. In the course of carrying, an opening 24 for dropping the foreign matter is provide, and on the upper part of the opening part, a magnet 6 is provided. The carrier and a normal polarity toner only are carried across the opening part by a rotation of a coil spring 23.

Inventors

• 👤 Susumu Tanaka
• 👤 Kenjiyu Oka

Bibliographic Details