Abstract: Provided is a post-processing apparatus which sequentially receives sheets one by one from an image forming apparatus to execute a post-processing on the sheets, including: a first transport device which receives the sheets delivered from the image forming apparatus and transports the sheets; a sheet overlap device which stays the sheets transported by the first transport device and causes another sheet transported sequentially by the first transport device to overlap at least one stayed sheet; a second transport device which transports a plurality of sheets overlapping each other by the sheet overlap device; a plurality of stacking devices capable of stacking a plurality of sheets transported by the second transport device; and a controller which changes control of sheet overlapping caused by the sheet overlap device depending on which stacking device selected from among the plurality of stacking devices the sheets are to be transported to.

Abstract: Provided is a sheet folding apparatus for folding a sheet stack, including a sheet stack support member for supporting a sheet stack by being abutted against a lower edge of the sheet stack, an abutting member for folding the sheet stack by making the sheet stack supported by the sheet stack support member abutted against a leading edge of the abutting member, and paired folding rollers for sandwiching the sheet stack folded by the abutting member to fold the sheet stack at a fold position, in which a position where the sheet stack is abutted against the leading edge of the abutting member with respect to the fold position is varied based on sheet stack information.

Abstract: A sheet processing apparatus including a folding unit, a crease processing unit, and a holding portion. The folding unit is configured to fold a sheet bundle, the crease processing unit forms a crease on a folded part of the sheet bundle, and the holding portion holds the sheet bundle between the folding unit and the crease processing unit as the crease processing unit forms the crease on the folded part.

Abstract: A folded back portion flattening device includes a gripper and a presser. The gripper grips a sheet bundle formed into a booklet with the folded back portion protruding from the gripper. The presser presses the folded back portion of the sheet bundle gripped by the gripper, and includes pressing rollers which have pressing rotational surfaces and which are disposed along the folded back portion. The pressing rotational surfaces press the folded back portion. The pressing rollers are disposed so that the rotational pressing surface of a second pressing roller, which presses the folded back portion after the rotational pressing surface of a first pressing roller has pressed the folded back portion, presses deeper into an edge of the sheet bundle than the rotational pressing surface of the first pressing roller. At least one of the gripper and presser is movable in a direction parallel to the folded back portion.

Abstract: A sheet-bundle spine treatment apparatus includes upper and lower press-rollers for adjusting a crease shape by moving while pinching front and rear surfaces of a spine of a folded sheet-bundle therebetween and a flattening roller for flattening a back of the sheet-bundle by moving while pushing the back of the spine of the sheet-bundle. At least one of the upper and lower press-rollers and the flattening roller is selected so as to allow it to operate.

Abstract: Disclosed is a sheet discharging apparatus including a charge eliminating member which is provided downstream a pair of swinging rollers for discharging a sheet, and is directed along a sheet discharging direction from its upstream side toward its downstream side. In the sheet discharging apparatus, the charge eliminating member is directed along the sheet discharging direction from its upstream side toward its downstream side, so that an area of the charge eliminating member facing a sheet is made larger than that of a conventional one, and static electricity of the sheet can be surely removed. Particularly, even when the sheet is a color sheet on which a color image charged with more static electricity than a monochromatic sheet is formed, the static electricity of the color sheet can be surely removed.

Abstract: A folded back portion flattening device includes a gripper and a presser. The gripper grips a sheet bundle formed into a booklet with the folded back portion protruding from the gripper. The presser presses the folded back portion of the sheet bundle gripped by the gripper, and includes pressing rollers which have pressing rotational surfaces and which are disposed along the folded back portion. The pressing rotational surfaces press the folded back portion. The pressing rollers are disposed so that the rotational pressing surface of a second pressing roller, which presses the folded back portion after the rotational pressing surface of a first pressing roller has pressed the folded back portion, presses deeper into an edge of the sheet bundle than the rotational pressing surface of the first pressing roller. At least one of the gripper and presser is movable in a direction parallel to the folded back portion.

Abstract: A sheet processing device includes a pair of gripping rollers which can grip and convey a sheet bundle in a booklet-like form, a pressing roller which presses and flattens the folded back portion of the sheet bundle gripped by the gripping rollers, and a control unit which performs rotation control on the pair of gripping rollers. The control unit controls the gripping rollers so as to stop when the folded back portion of the sheet bundle protrudes from the rollers by a predetermined amount. The pressing roller flattens down the protruding folded back portion when the gripping rollers are stopped by the control unit and is in the state of gripping the sheet bundle.

Abstract: A sheet processor includes a holding unit for holding a folded batch of sheets, a pressing member for pressing against a folded portion of the batch of sheets, a nipping member for nipping portions of the batch adjacent to the folded portion so as to nip the batch of sheets from opposite directions, and a casing for supporting the pressing member and the nipping member.

Abstract: A sheet bundle spine folded portion flattening apparatus is provided with a conveying portion which conveys the folded sheet bundle with the spine folded portion of the folded sheet bundle at a head, a sheet bundle moving device for moving it in a direction along the spine folded portion of the sheet bundle, and a pressing device for pressing the spine folded portion of the sheet bundle being moved by the sheet bundle moving device, and is adapted to press and flatten the spine folded portion of the sheet bundle being moved by the sheet bundle moving device, by the pressing device and therefore, can flatten the spine folded portion almost without stopping the movement of the sheet bundle, as compared with the conventional art, and the sheet bundle treating efficiency is enhanced.

Abstract: An image forming apparatus has an abnormality detecting device for detecting the abnormality of the sheet, an abnormal sheet containing portion for containing therein the sheet of which the abnormality has been detected, a normal sheet containing portion for temporarily containing therein a normal sheet of which the abnormality has not been detected, and a controlling portion for controlling the image forming portion so that the abnormal sheet is contained in the abnormal sheet containing portion, and that an image formed on the abnormal sheet may be formed on a predetermined subsequent sheet subsequent to the abnormal sheet. The normal sheet between the abnormal sheet and the predetermined subsequent sheet is contained in the normal sheet containing portion after the abnormal sheet is contained in the abnormal sheet containing portion, and the normal sheet contained in the normal sheet containing portion is delivered after the predetermined subsequent sheet has been delivered.

Abstract: Disclosed is a sheet discharging apparatus including a charge eliminating member which is provided downstream a pair of swinging rollers for discharging a sheet, and is directed along a sheet discharging direction from its upstream side toward its downstream side. In the sheet discharging apparatus, the charge eliminating member is directed along the sheet discharging direction from its upstream side toward its downstream side, so that an area of the charge eliminating member facing a sheet is made larger than that of a conventional one, and static electricity of the sheet can be surely removed. Particularly, even when the sheet is a color sheet on which a color image charged with more static electricity than a monochromatic sheet is formed, the static electricity of the color sheet can be surely removed.

Abstract: An inspection device having a reading portion for reading an image on a sheet having an image formed thereon, a storage portion for storing therein image data read by the reading portion, and a selecting portion for selecting one of a first mode for storing the image data read by the reading portion in the storage portion, and a second mode for judging whether the image data read by the reading portion is similar to the image data stored in the storage portion.

Abstract: A sheet transporting apparatus and an image forming apparatus, both achieving the prevention of any jam owing to a sheet delivered by an aftertreatment apparatus, transport the sheet, which has straightly been transported or has been reversed and transported in a buffer unit, to a sorter as it is without performing any correcting operation by a correcting device when a group mode is selected, and the sheet transporting means and the image forming apparatus perform the curl correction of the sheet by executing correcting operation of the correcting device to remove the curl of the sheet when a mode other than the group mode is selected.

Abstract: An image forming apparatus adapted to form an image on a sheet by an image forming portion, and thereafter detect the presence or absence of any abnormality of the sheet on which the image has been formed has an abnormality detecting device for detecting the abnormality of the sheet, an abnormal sheet containing portion for containing therein the sheet of which the abnormality has been detected by the abnormality detecting device, a normal sheet containing portion for temporarily containing therein a normal sheet of which the abnormality has not been detected by the abnormality detecting device, and a controlling portion for controlling the image forming portion so that the abnormal sheet of which the abnormality has been detected by the abnormality detecting device may be contained in the abnormal sheet containing portion, and that an image formed on the abnormal sheet may be formed on a predetermined subsequent sheet subsequent to the abnormal sheet.

Abstract: An image forming apparatus includes a plurality of image bearing members, each for bearing an image, a transfer belt onto which images on each of the image bearing members are transferred, and a transfer device for transferring an image on the transfer belt onto a transfer material. When images borne on the plurality of image bearing members are sequentially transferred onto the transfer belt so as to form superposed images, such superposed images simultaneously are transferred onto the transfer material. An angle made by a first surface plane of the transfer belt which at least one of the plurality of image bearing members faces and a second surface plane of the transfer belt which image bearing members other than the at least one image bearing member face is substantially a right angle.

Abstract: A sheet transporting apparatus and an image forming apparatus, both achieving the prevention of any jam owing to a sheet delivered by an aftertreatment apparatus, transport the sheet, which has straightly been transported or has been reversed and transported in a buffer unit, to a sorter as it is without performing any correcting operation by a correcting device when a group mode is selected, and the sheet transporting means and the image forming apparatus perform the curl correction of the sheet by executing correcting operation of the correcting device to remove the curl of the sheet when a mode other than the group mode is selected.

Abstract: An image forming apparatus includes a plurality of image bearing members, each for bearing an image, a transfer belt onto which images on each of the image bearing members are transferred, and a transfer device for transferring an image on the transfer belt onto a transfer material. When images borne on the plurality of image bearing members are sequentially transferred onto the transfer belt so as to form superposed images, such superposed images simultaneously are transferred onto the transfer material. An angle made by a first surface plane of the transfer belt which at least one of the plurality of image bearing members faces and a second surface plane of the transfer belt which image bearing members other than the at least one image bearing member face is substantially a right angle.