| 摘要 |
<p>A developing device with two developing rollers comprises a powder bin (1), two-component developer, a photosensitive drum (2), a powder conveying roller (3), a first developing roller (4) disposed at the upstream of the rotation direction of the photosensitive drum (2), and a second developing roller (5) disposed at the downstream of the rotation direction of the photosensitive drum (2), wherein the two-component developer comprises magnetic conduction carrier (6) and toner capable of attaching to the magnetic conduction carrier (6); a main magnetic pole (8) capable of transferring the magnetic conduction carrier (6) on the surface of the first developing roller (4) to the surface of the photosensitive drum (2) is fixedly arranged in the photosensitive drum (2); a first magnetic pole group is fixedly arranged in the first developing roller (4); the first magnetic pole group contains a first auxiliary magnetic pole (9) of which the polarity is opposite to the polarity of the main magnetic pole (8) and the position is corresponding to the position of the main magnetic pole (8); a second magnetic pole group capable of transferring the magnetic conduction carrier (6) on the surface of the photosensitive drum (2) to the surface of the second developing roller (5) is fixedly arranged in the second developing roller (5); and the toner is placed in the powder bin (1) and can attach to the magnetic conduction carrier (6) by the action of the powder conveying roller (3).</p> |
