Table of Contents
3.12 Process Unit Related Section
3.12.1
General description
The equipment has 4 process units (EPU: Electrographic Processing Unit). Each process unit consists
of the drum cleaner unit and developer unit which are unified, and it corresponds to the image forming
process of Y, M, C and K colors. This chapter describes the development (developer unit) which is a
process of making toner adhere to the drum.
The developer material which is comprised of a mixture of toner and carrier, and is filled in the
developer unit of each color. The toner is charged to a negative polarity and the carrier to a positive
polarity, due to the friction with each other caused by mixing in the developer unit. The charged toner is
supplied to the photoconductive drum surface by means of a magnetic roller, allowing it to adhere to the
areas on the drum surface where the potential is lower than the developer bias which is applied to the
magnetic roller. Through this process, the latent images are formed on the photoconductive drum
surface.
Drum(Y)
Drum(M)
Drum(C)
Drum(K)
Drum cleaner unit ( M )
Drum cleaner unit ( K )
Drum cleaner unit (Y)
Drum cleaner unit (C)
Temperature/Humidity sensor
Waste toner box
Fig. 3-48
e-STUDIO5540C/6540C/6550C/5560C/6560C/6570C
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