Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorsToshihiko Takayama, Takeshi Shinji
Life of this patent
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Abstract
An image forming apparatus includes a control unit configured to perform a first mode, a second mode, and a third mode. The first mode is a mode in which a sheet conveyance unit is controlled so that an arrival time from a passage of a trailing edge of a preceding sheet through a nip portion to an arrival of a leading edge of a succeeding sheet succeeding to the preceding sheet at the nip portion becomes a first time. The second mode is a mode in which the sheet conveyance unit is controlled so that the arrival time becomes a second time. The third mode is a mode in which the sheet conveyance unit is controlled so that the arrival time becomes a third time. The second time is longer than the first time, and the third time is longer than the second time.
Claims8
An image forming apparatus comprising:
- an image forming unit configured to form a toner image on a sheet;
- a sheet conveyance unit configured to convey the sheet toward the image forming unit in a sheet conveyance direction;
- a fixing unit comprising a rotary member pair configured to form a nip portion and a heating element configured to heat the nip portion, the fixing unit being configured to fix the toner image on the sheet by heating the sheet on which the toner image is formed at the nip portion;
- a sheet width detection unit configured to output a first signal and a second signal, the sheet width detection unit being configured to output the first signal in a case where a sheet length in a width direction orthogonal to the sheet conveyance direction is equal to or larger than a first threshold value, the sheet width detection unit being configured to output the second signal in a case where the sheet length in the width direction is less than the first threshold value;
- a sheet length detection unit configured to output an output value corresponding to a sheet length in the sheet conveyance direction;
- and
- a control unit configured to perform a first mode, a second mode, and a third mode, the first mode being a mode in which the sheet conveyance unit is controlled so that in a job continuously conveying a plurality of sheets, an arrival time from a passage of a trailing edge of a preceding sheet through the nip portion to an arrival of a leading edge of a succeeding sheet succeeding to the preceding sheet at the nip portion becomes a first time, the second mode being a mode in which the sheet conveyance unit is controlled so that the arrival time becomes a second time, the third mode being a mode in which the sheet conveyance unit is controlled so that the arrival time becomes a third time, the second time being longer than the first time, the third time being longer than the second time,
- wherein the control unit is configured to perform the first mode in a case where the sheet width detection unit outputs the first signal, and configured to perform the third mode in a case where the sheet width detection unit outputs the second signal and the sheet length detection unit outputs the output value not corresponding to a length, in the sheet conveyance direction, of a sheet size information specified by the job, and configured to perform the second mode in a case where the sheet width detection unit outputs the second signal and the sheet length detection unit outputs the output value corresponding to the length, in the sheet conveyance direction, of the sheet size information.
Dependencies are inferred from the claim text.