Sheet processing apparatus and image forming system
AssigneeCanon Finetech Nisca Inc.
InventorHideyuki Kubota
Life of this patent
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Abstract
To prevent displacement of first fold positions and collapse of discharged and stacked sheets when sheet fold processing is performed a plurality of times for each sheet. First fold processing is applied to a sheet conveyed to a conveying path by a rotating body pair 22. The sheet that has been subjected to the first fold processing is fed back to the conveying path while a first fold line is being opened. Then, second fold processing is applied to the sheet that has been fed back to the conveying path by the rotating body pair 22. The resultant sheet is discharged with the first fold line opened.
Claims8
A sheet processing apparatus comprising:
- a conveying path that guides a sheet conveyed in a predetermined conveying direction;
- a position adjusting unit that moves the sheet conveyed to the conveying path in the conveying direction of the conveying path and its opposite direction so as to adjust the position of the sheet;
- a fold rotating body pair disposed opposite to a surface of the sheet conveyed to the conveying path, having a nip part that nips a first fold position extending in a sheet width direction intersecting the conveying direction of the sheet conveyed to the conveying path and a second fold position extending in the sheet width direction at a different position from the first fold position to apply fold processing to the sheet, and configured to be rotatable in a first direction so as to perform the fold processing and in a second direction opposite to the first direction so as to feed back the sheet to the conveying path;
- a biasing unit that biases the first and second fold positions of the sheet that have been adjusted by the position adjusting unit toward the nip part of the fold rotating body pair;
- and
- a control unit that controls the position adjusting unit, fold rotating body pair, and biasing unit to perform partly-opened fold processing, the partly-opened fold processing including:
- forming a first fold line at the first fold position of the sheet position-adjusted by the position adjusting unit and biased by the biasing unit by rotating the fold rotating body pair in the first direction;
- stopping the rotation of the fold rotating body pair during which time one of upstream and downstream side end edges of the sheet in the conveying direction that is closer to the first fold line is positioned in the conveying path and then rotating the fold rotating body pair in the second direction to feed back the sheet while opening the first fold line at which the fold processing has been applied;
- and applying fold processing at the second fold position position-adjusted by the position adjusting unit and biased by the biasing unit by rotating the fold rotating body pair in the first direction.
Dependencies are inferred from the claim text.