Abstract: A powder replenisher includes a powder replenishment container to be replenished with powder. A pressure adjuster increases and decreases operating pressure applied to a variable capacity portion. A powder measuring instrument measures an amount of the powder that replenishes the powder replenishment container. A controller performs a precise replenishing mode in which, after the controller determines that the powder replenishment container is replenished with the powder in a predetermined amount, while the controller controls the powder measuring instrument to measure the amount of the powder inside the powder replenishment container, the controller controls the pressure adjuster to replenish the powder replenishment container with the powder in a target amount.

Abstract: A method of manufacturing a toner including manufacturing a coarse toner containing a binder resin and a coloring agent, and screening the coarse toner with a screen device including a top screen having an opening of from 26 to 43 ?m and a bottom screen situated below the top screen having an opening of from 54 to 150 ?m to screen the coarse toner with the top screen by ultrasonic vibration and mechanical vibration at 50° C. or lower, and with the bottom screen by mechanical vibration at 35° C. or lower.

Abstract: A method of manufacturing a toner including manufacturing a coarse toner containing a binder resin and a coloring agent, and screening the coarse toner with a screen device including a top screen having an opening 5 of from 26 to 43 ?m and a bottom screen situated below the top screen having an opening of from 54 to 150 ?m to screen the coarse toner with the top screen by ultrasonic vibration and mechanical vibration at 50° C. or lower, and with the bottom screen by mechanical vibration at 35° C. or lower.