Patent ID: 6836634
Filing Date: 2004-12-28
Classification: G03G

Abstract:
A developer unit of an electrophotographic image forming apparatus having a developer container and a photosensitive medium, comprising:a developer roller to rotate to supply the developer to a latent electrostatic image formed on the photosensitive medium; a metering blade installed to contact the developer attached to an outer circumference of the developer roller so as to control the developer attached to the outer circumference of the developer roller to a thickness; and a blocking blade installed between the developer roller and the metering blade to prevent a wrap-around phenomenon of the developer when the metering blade controls the thickness of the developer attached to the developer roller, wherein the blocking blade includes: a magnetic fluid which contacts the developer roller and the metering blade to prevent the developer from flowing to both ends of the metering blade; and a magnet applying a pressure to the magnetic fluid to fix the magnetic fluid to the magnet so that the magnetic fluid contacts the developer roller and the metering blade.