| 摘要 |
In electrographic apparatus a magnetic brush development station has a housing with a sump for holding a supply of developer material, and a magnetic brush that applies developer material from the sump to a latent image on a photoconductor. A rotatable transport roller feeds developer material from the sump toward the magnetic brush. A cylindrical tube is positioned around the roller and spaced from it. The tube has two elongate, spaced slots, and the tube is rotatable between first and second positions. A shut-off member engages the tube adjacent one of the slots. When the tube is in one of its positions the shut-off member is at one side of the one slot and developer material from the sump can pass through the one slot to the magnetic brush. When the tube is in its second position the shut-off member blocks the flow of developer material to the magnetic brush.
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