| 摘要 |
A developing unit of magnetic brush type for use in an electrophotographic copying machine comprises a casing, a magnet mounted on said casing and disposed in parallel relationship with a central axis of rotation of a photosensitive member in the form of a drum, and a sleeve which surrounds the magnet and on which a magnetic brush is to be formed. The unit also comprises another or second central axis of rotation associated with the magnetic brush represented by a mounting shaft for the magnet which has its opposite ends projecting out of the casing. A first positioning member, on which is detachably fitted on one end of the mounting shaft representing the second central axis of rotation and having a support aperture for supporting said one end, and a second positioning member detachably fitted on a drum shaft on the first central axis of rotation, has a support aperture formed therein for detachably fitting on the other end of the magnet mounting shaft to support it. The arrangement permits precise positioning of the magnetic brush with respect to the drum to be simply achieved.
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