Application to multi roller electrostatic toning system three level image process

摘要

(57) Abstract The image is formed the nonmagnetic toner which possesses the first and second respective single applicator roller making use of the first and second fluidization bed. The electric charge buildup area like the photoconductivity belt (for example,) is electrified evenly in specified voltage level by corona device, at the same time, the locate separately where at least first and second differ the electrostatic latent image which is done is formed to the position where the top of the buildup area differs (by laser based output scanning arrangement). Next, this aspect passes the first applicator roller, furthermore passes the second applicator roller and moves. While preventing the development of the second image, in order for the first image to be developed by the nonmagnetic toner which is transported to the first image from the first applicator roller, while the first fluidization bed and the applicator roller the vise being done electrically at first bias level, at the same time, preventing the development of the first image, in order for the second image to be developed by the nonmagnetic toner which is transported to the second image from the second applicator roller, the second fluidization bed and the second applicator roller is biased electrically at second bias level. Bias of negative number is impressed in the first fluidization bed, positive bias is impressed in the second fluidization bed, on the one hand, the first and second roller is possible with to be just biased at the voltage level which 50 volts/bolts differs at least. The black toner is applied by the first fluidization bed, the color toner is applied by the second fluidization bed. It is possible to transport to the applicator roller which is related the toner from the respective fluidization bed making use of the transport roller.