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US 2002/0176716 A1Published application
Image forming apparatus
AssigneeBrother Kogyo Kabushiki Kaisha
InventorKatsuyuki Yokoi
Life of this patent
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Abstract
In a laser printer, when a sheet of paper, which is to be supplied in between a photosensitive drum and a transfer roller, is jammed, after the sheet of paper is removed and the jam is cleared up, a developing jam control program is executed to rotate a drum cleaning roller at a rotational speed higher than a normal rotational speed and to apply the transfer roller with a reverse bias voltage whose polarity is the same as that of the charged toner.
Claims17
An image forming apparatus, comprising:
- a conveying unit conveying a recording medium;
- a trouble-detecting unit detecting whether some trouble occurs against conveyance of the recording medium;
- a trouble-clearing-up judging unit judging whether the trouble detected by the trouble-detecting unit has been cleared up;
- an image bearing body bearing thereon a visible image, which is made from a developing agent electrically charged in a predetermined polarity;
- a transfer unit located opposing the image bearing body and transferring the visible image onto the recording medium;
- a cleaning roller located opposing and contacting the image bearing body and collecting the developing agent from the image bearing body;
- and
- a control unit applying the transfer unit with a bias voltage of a polarity opposite to that of the developing agent when the trouble-detecting unit detects no trouble, the control unit applying, when the trouble-judging unit detects some trouble, the transfer unit with a bias voltage of a polarity the same as that of the developing agent after the trouble-clearing-up judging unit judges clearing-up of the trouble.
5 more elements
An image forming apparatus, comprising:
- a conveying unit conveying a recording medium;
- a trouble-detecting unit detecting whether some trouble occurs against conveyance of the recording medium;
- a trouble-clearing-up judging unit judging whether the trouble detected by the trouble-detecting unit has been cleared up;
- an image bearing body bearing thereon a visible image, which is made from a developing agent electrically charged in a predetermined polarity;
- a transfer unit located opposing the image bearing body and transferring the visible image onto the recording medium;
- a cleaning roller located opposing and contacting the image bearing body and collecting the developing agent from the image bearing body;
- and
- a control unit controlling at least one of the cleaning roller and the image bearing body in a first condition when the trouble-detecting unit detects no trouble, the control unit controlling, when the trouble-judging unit detects some trouble, the at least one of the cleaning roller and the image bearing body in a second condition that is different from the first condition after the trouble-clearing-up judging unit judges clearing-up of the trouble.
5 more elements
Dependencies are inferred from the claim text.