Sheet processing apparatus and image forming system
AssigneeCanon Kabushiki Kaisha
InventorsKoji Takematsu, Kazuhisa Okuda, Kenjiro Sugaya, Shutaro Saito
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Abstract
In order to correct a corrugation caused when a sheet widthwise edge portion elongates more than the vicinity of the center in a sheet feeding direction, a sheet processing apparatus includes: a fixing portion that fixes a toner image onto a sheet by heating, a plurality of pairs of rollers provided along a sheet feeding direction with an interval in the downstream of the fixing portion in the feeding direction to nip and convey a sheet; and a tensioning device that applies a tensile strength of the sheet feeding direction to a sheet in a center area of a width direction perpendicular to the sheet feeding direction.
Claims25
A sheet processing apparatus comprising:
- a first roller;
- a driving member that has a drive source for generating a driving force and which rotates the first roller by the driving force of the drive source;
- a first opposite roller that forms a first nip portion along with the first roller;
- a second roller provided on a downstream side in a sheet feeding direction from the first roller;
- a second opposite roller that forms a second nip portion along with the second roller;
- and
- a load unit that applies a load torque to the first roller,
- wherein at least one of the first nip portion and second nip portion is shorter than a maximum length of a sheet that can be conveyed in a main body of the apparatus in a width direction perpendicular to the feeding direction, and
- the load unit applies a tension in the sheet feeding direction to the sheet fed between the first and second nip portions after the sheet fed by the first nip portion is nipped in the second nip portion.
Dependencies are inferred from the claim text.