| 摘要 |
A development unit for use in an image formation apparatus is provided with a mechanism that allows a toner box to be removably attached to a case of the development unit. The mechanism includes a concave first shutter that closes a toner exhaust port formed in the toner box and a second convex shutter that closes a toner introduction port formed in an agitation chamber. The first and second shutter interlock with each other. Arms are provided on bosses formed along the outer circumference of support grooves in a pair of brackets in the case. The second shutter is attached to the arms, and the first shutter is provided between levers that pivot on the support shaft of the toner box. When the levers are pivoted while the support shaft is fitted into the support grooves, engagement projections formed on the levers are positioned in insertion grooves formed in the arms. The arms are then pivotally moved, so that the first and second shutters pivot while overlapping each other. As a result of this, unnecessary leakage of toner is prevented.
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