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US 8,573,593 B2Granted
Image forming apparatus
AssigneeSharp Kabushiki Kaisha
InventorYoshinori Shiraishi
Life of this patent
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Abstract
An image forming apparatus includes a unit that detects the position of a sheet in a sheet transport path when jamming is detected, a forced moving processing unit that, when jamming is detected and rotational driving of sheet transport rollers is stopped, based on the position of the sheet in the sheet transport path, performs forced moving processing in which the sheet is transported so as to forcibly move the sheet to a sheet removal position, and a forced moving processing determination unit that determines whether the forced moving processing is to be performed by the forced moving processing unit in accordance with the position of the sheet that was detected by the sheet position detection unit.
Claims10
An image forming apparatus comprising:
- a sheet transport path that guides a sheet along a sheet transport direction;
- a plurality of sheet transport rollers provided along the sheet transport path in order to transport the sheet in the sheet transport direction in the sheet transport path;
- a driving portion that rotationally drives the sheet transport rollers;
- a sheet detection portion that detects a transport time of the sheet that is transported in the sheet transport path by the sheet transport rollers that are rotationally driven by the driving portion;
- and
- a control portion that stops rotational driving of the sheet transport rollers by the driving portion in a case where jamming of the sheet has been detected using the transport time detected by the sheet detection portion,
- wherein a sheet removal job region for removal of the sheet that was motionless when the jamming was detected is provided in the sheet transport path, and
- the control portion comprises:
- a sheet position detection unit that detects the position of the sheet in the sheet transport path in the sheet transport direction when the jamming was detected;
- a forced moving processing unit that, in a case where the jamming is detected and rotational driving of the sheet transport rollers by the driving portion is stopped, based on the position of the sheet in the sheet transport path in the sheet transport direction that was detected by the sheet position detection unit, performs forced moving processing in which the sheet is transported so as to forcibly move the sheet to sheet removal position at which at least part of the sheet is located in the sheet removal job region;
- and
- a forced moving processing determination unit that determines whether the forced moving processing is to be performed by the forced moving processing unit in accordance with the position of the sheet in the sheet transport path in the sheet transport direction that was detected by the sheet position detection unit,
- wherein in a case of performing a consecutive image forming operation for consecutively performing image formation on a plurality of the sheets, when the sheet is to be transported in the sheet transport direction toward the sheet removal position in the forced moving processing performed by the forced moving processing unit, the sheet removal position is set to a position at which a downstream side edge of the sheet in the sheet transport direction is disposed on the upstream side of an upstream side edge in the sheet transport direction of a nearest sheet that is motionless ahead of the sheet.
10 more elements
An image forming apparatus comprising:
- a sheet transport path that guides a sheet along a sheet transport direction;
- a plurality of sheet transport rollers provided along the sheet transport path in order to transport the sheet in the sheet transport direction in the sheet transport path;
- a driving portion that rotationally drives the sheet transport rollers;
- a sheet detection portion that detects a transport time of the sheet that is transported in the sheet transport path by the sheet transport rollers that are rotationally driven by the driving portion;
- and
- a control portion that stops rotational driving of the sheet transport rollers by the driving portion in a case where jamming of the sheet has been detected using the transport time detected by the sheet detection portion,
- wherein a sheet removal job region for removal of the sheet that was motionless when the jamming was detected is provided in the sheet transport path, and
- the control portion comprises:
- a sheet position detection unit that detects the position of the sheet in the sheet transport path in the sheet transport direction when the jamming was detected;
- a forced moving processing unit that, in a case where the jamming is detected and rotational driving of the sheet transport rollers by the driving portion is stopped, based on the position of the sheet in the sheet transport path in the sheet transport direction that was detected by the sheet position detection unit, performs forced moving processing in which the sheet is transported so as to forcibly move the sheet to a sheet removal position at which at least part of the sheet is located in the sheet removal job region;
- and
- a forced moving processing determination unit that determines whether the forced moving processing is to be performed by the forced moving processing unit in accordance with the position of the sheet in the sheet transport path in the sheet transport direction that was detected by the sheet position detection unit,
- wherein the sheet position detection unit detects the position of the sheet in the sheet transport path in the sheet transport direction based on a transport distance of the sheet calculated using a jamming detection time that is from a detection time at a reference detection position to the time when the jamming was detected, the reference detection position serving as a reference detection position of the transported sheet on the upstream side of the sheet removal job region in the sheet transport path.
10 more elements
Dependencies are inferred from the claim text.