Abstract: A binding member is provided and includes: upper teeth having a tooth form configured to form a convex-concave portion on a recording material bundle; and lower teeth having a tooth form configured to form the convex-concave portion on the recording material bundle, and paired with the upper teeth. At least one of the upper teeth and the lower teeth includes: a first tooth row having a first tooth form having a first shape suitable for binding a first binding number of sheets; and a second tooth row having a second tooth form having a second shape suitable for binding a second binding number of sheets which is smaller than the first binding number of sheets.

Abstract: There is provided a binding processing device including: a first pressing member including a convex portion formed by a curved surface with a curvature and protruding toward a sheet bundle; and a second pressing member including a concave portion formed by a curved surface with a curvature and configured to be combined with the convex portion through the sheet bundle, the second pressing member configured to press the sheet bundle sandwiched between the first and second pressing members, wherein in a state where the convex portion of the first pressing member and the concave portion of the second pressing member are combined with each other, a gap is formed between the convex portion and the concave portion in a cross section of the first and second pressing members along a pressing direction, and the gap has a volume larger than a volume of the sandwiched sheet bundle.

Abstract: A recording-medium binding device includes a first tooth row that includes teeth arranged in a tooth arrangement direction and a second tooth row that includes teeth, that is to be engaged with the first tooth row, and that cooperates with the first tooth row to bind recording media by pinching a batch of the recording media. In the tooth arrangement direction, the first and the second tooth rows have first and second ranges. In the first range, an engaging height is a first engaging height, and a width of an effective tooth top is a first effective tooth top width. In the second range, the engaging height is a second engaging height that is smaller than the first engaging height, and a width of an effective tooth top is a second effective tooth top width that is larger than the first effective tooth top width.

Abstract: A recording-medium binding device includes first and second tooth groups. The first tooth group includes first and second tooth rows. The second tooth group includes third and fourth tooth rows. The third tooth row to be engaged with the first tooth row forms, together with the first tooth row, a first tooth row pair. The fourth tooth row to be engaged with the second tooth row forms, together with the second tooth row, a second tooth row pair. A second engaging height in the second tooth row pair is smaller than a first engaging height in the first tooth row pair. A second effective tooth top width in the second tooth row pair is larger than a first effective tooth top width in the first tooth row pair.

Abstract: A binding processing apparatus includes: a pressure-applying member pair that has multiple projections arranged side-by-side and applies pressure to a sheet stack by pressing the projections against the sheet stack; and an advancing-and-retracting part that causes at least one of the pressure-applying members in the pressure-applying member pair to move toward or away from the other pressure-applying member. A pitch of the projections in each pressure-applying member is from 1.2 mm to 1.5 mm, and a height of the projections is from 0.55 mm to 0.75 mm, and a load per unit area applied from each pressure-applying member to the sheet stack when the pressure-applying member applies pressure to the sheet stack is from 42 N/mm2 to 94 N/mm2.

Abstract: A binding processing apparatus includes a pair of pressing members each including a concave-convex portion configured to form a concave part and a convex part in a recording material bundle. The concave-convex portion includes protrusion portions. Aside surface of each protrusion portion is inclined so that the protrusion portion is widened from an apex of the protrusion portion. The side surfaces of the protrusion portions of a first pressing member that is one of the pressing members and the side surfaces of the protrusion portions of a second pressing member that is the other of the pressing members intersect with each other during pressing when viewed in a column direction of the protrusion portions.

Abstract: An image forming system includes an image forming unit configured to form an image on a sheet and provided in an apparatus body, a first sheet processing device provided in a first housing and configured to perform a first binding processing, without using a needle, on the sheet that is formed with the image and stacked, and a second sheet processing device provided in a second housing that is different from the first housing and configured to perform a second binding processing, using a needle, on the sheet that is formed with the image and stacked. The first housing and the second housing are mounted on the apparatus body. At least a portion of the first housing is positioned within a range exclusively occupied by a rectangular space defined by a maximum outer dimension of the apparatus body. The second housing is positioned outside the rectangular space.

Abstract: There is provided an image forming system including an apparatus body including an image forming unit configured to form an image on a sheet, a first sheet processing device mounted on the apparatus body, and configured to perform a first binding processing on plural sheets each of which is formed with an image by the image forming unit, and a second sheet processing device mounted on the apparatus body at a position different from that of the first sheet processing device, and configured to perform a second binding processing different from the first binding processing on the plural sheets, each of which is formed with an image by the image forming unit.

Abstract: A binding device includes a first pushing member that includes protrusions along one direction and that pushes a recording-material bundle as a result of pushing the protrusions against one of surfaces of the recording-material bundle, the protrusions disposed side by side in a direction that intersects the one direction; and a second pushing member that includes protrusions along the one direction and that pushes the recording-material bundle as a result of pushing the protrusions against the other surface of the recording-material bundle, the protrusions disposed side by side in the direction that intersects the one direction, wherein, in at least one end portion in the one direction of each protrusion of at least one of the first pushing member and the second pushing member, a hollow is disposed in a top portion of each protrusion.

Abstract: A binding process device includes an advancing member and a binding process unit. The advancing member advances toward a corner of a recording-medium bundle having multiple edges and having the corner at an intersection position where the edges intersect. The binding process unit performs a binding process on the recording-medium bundle by causing the advancing member to advance toward the corner and is capable of performing the binding process at a first position and at a second position located closer to the intersection position than the first position.

Abstract: A binding process device includes an advancing member and an advancing unit. The advancing member has a first end and a second end located opposite from the first end and advances toward a surface of a recording-medium bundle so as to press against the recording-medium bundle. The advancing unit causes the advancing member to advance toward the surface of the recording-medium bundle. When the advancing member advances toward the surface of the recording-medium bundle so as to press against the recording-medium bundle, at least one of the first end and the second end of the advancing member is positioned outside an edge of the recording-medium bundle.

Abstract: A folding processing device includes a pressing section that includes a first opposing member and a second opposing member, the first opposing member opposing a folded portion of a folded sheet, the second opposing member opposing the first opposing member with the folded portion interposed therebetween, the pressing section pressing the folded portion by nipping the folded portion by using the first opposing member and the second opposing member; and a guiding section that is disposed upstream from the pressing section in a sheet transport direction, the guiding section nipping the sheet whose folded portion has passed through the guiding section and guiding the sheet to the pressing section.

Abstract: A sheet processing apparatus includes: an output unit that renders one side of a sheet convex and outputs the sheet, the sheet having the one side and other side; a first folding unit that mountain-folds the one side of the sheet, which is rendered to be convex, to form a first fold in the sheet; and a second folding unit that mountain-folds the one side of the sheet, which includes the first fold formed therein, to form a second fold in the sheet.

Abstract: Provided is a post-processing device including a stacking section that aligns and stacks recording materials which are sequentially transported, a saddle stitching section that binds plural sheets of recording materials in central portions of the recording materials, a center folding section that folds the plural sheets of recording materials into two in the central portions, a pressing section that presses a booklet in a thickness direction of the booklet, and a discharge section that discharges the booklet, which is pressed by the pressing section, with a folded portion of the booklet being a leading portion, wherein the booklet is held and stopped in a state of being nipped by the discharge section, and transport is initiated after the lapse of a predetermined stop time so that the booklet is discharged.

Abstract: A recording material fold enhancing device includes a pressing unit that includes one or more recessed portions and one or more protrusions, and that presses a fold of a recording material; a supporting unit that includes one or more recessed portions and one or more protrusions, and that supports the fold of the recording material; and a driving unit that moves the pressing unit and the supporting unit along a direction in which the fold of the recording material is formed. A portion of the fold of the recording material is interposed between the one or more recessed portions of the pressing unit and the one or more protrusions of the supporting unit, and another portion of the fold of the recording material is interposed between the one or more protrusions of the pressing unit and the one or more recessed portions of the supporting unit.

Abstract: A fold-enhancing device includes a pressing member, at least one retaining member, and a moving mechanism. The pressing member presses against a fold line of a recording-medium bundle folded into a booklet shape. The recording-medium bundle is obtained by stacking multiple sheets of recording media. The retaining member retains the recording-medium bundle and is provided at a position located away from the fold line in a direction intersecting the fold line and not in contact with the pressing member. The moving mechanism moves the pressing member and the retaining member in a direction extending along the fold line.

Abstract: Provided is a sheet folding device including a folding roll that is rotatably provided and includes a large diameter portion of which a diameter is greater than a diameter of another portion, and performs a folding process while pressing the large diameter portion onto a sheet, and a contact portion displacement unit that makes a position of a contact portion that is a portion coming into contact with the large diameter portion in the sheet when the sheet on which the folding process has been performed by the folding roll passes through the folding roll again different from a position of the contact portion when the sheet passes through the folding roll for the last time.

Abstract: A sheet processing apparatus includes a rotating member, a switching unit, and a pressing unit. The rotating member is rotatable and has a facing portion that faces a fold section of a sheet. The rotating member rotates so as to switch the facing portion to another facing portion. Each facing portion is provided with a protrusion. A set position of the protrusion in an axial direction varies from facing portion to facing portion. The switching unit rotates the rotating member so as to switch the facing portion that faces the fold section. The pressing unit presses the protrusion of the facing portion against the fold section.

Abstract: A sheet processing apparatus includes a pressing unit and a shifting unit. The pressing unit has a protrusion and presses the protrusion against a fold section of a sheet. The fold section extends in one direction. The shifting unit moves at least one of the protrusion of the pressing unit and the sheet so as to shift a pressing position, at which the fold section is pressed by the protrusion, in the one direction or in a direction opposite to the one direction.

Abstract: Provided is a pair of sheet transport rolls including a first roll that has a first convex portion spirally provided on an outer peripheral surface, and a second roll that is provided along the first roll and has a second convex portion that is spirally provided in a position facing the first convex portion of the first roll on the outer peripheral surface, wherein the first roll and the second roll are rotated, and a sheet is transported while being sandwiched between the first convex portion of the first roll and the second convex portion of the second roll.