According to an aspect of the present invention, there is provided a sheet processing device including a first teeth portion, a second teeth portion that clamps and binds a sheet bundle with the first teeth portion, a first support portion supporting the first teeth portion, a shaft, and a second support portion supporting the second teeth portion. The second support portion includes first and second arm members integrally supported to be capable of swinging around the shaft between a binding position in which the second teeth portion clamps and binds the sheet bundle with the first teeth portion and a standby position in which the second teeth portion is apart from the first teeth portion. The second arm member is provided over the first arm member so as to cover a part of the first arm member.

A printing system obtains a print job, analyzes the obtained print job, and imposes print pages to a total of four surfaces of a print target sheet including two surfaces on each of front and back in accordance with a bookbinding format of the analyzed print job. As for an imposition method, if the bookbinding format of the print job is particular two fold bookbinding for which processing of two-folding a sheet and bonding a plurality of two-folded sheets is performed, imposition is performed while reserving a glue surface not to print out of the four surfaces of the print target sheet.

In accordance with an embodiment, a sheet post processing apparatus comprises a processing tray, a gluing section and a control section. Sheets are placed one by one in the processing tray. The gluing section enables glue to be adhered to the glue binding margin part of the sheets already placed in the processing tray. The control section includes a glue supply mode for supplying glue parts in such a manner that a glue part, which is different from a waiting glue part waiting for a next gluing when the previous glue binding is ended, is supplied to a glue adhering section of a first sheet for gluing with a second sheet through the gluing section.

According to an aspect of the invention, a binding device includes a first rotary member including a first serrated portion on its circumferential surface, a second rotary member including, on its circumferential surface, a second serrated portion to be engaged with the first serrated portion at an engaging position and configured to perform a binding process by rotating together with the first rotary member with a bundle of sheets pinched therebetween to form serrations in the sheet bundle in thickness direction and bring the sheets into engagement with each other while relatively moving the sheet bundle in a predetermined moving direction, and a clamping unit configured to, when the binding process is performed, clamp the sheet bundle at a clamping position upstream of the engaging position to apply a predetermined pulling force acting in a direction opposite to the moving direction to the sheet bundle.

A sheet processing device that bonds sheets to one another and then folds a resultant sheet bundle. The sheet processing device includes a stacker section that sequentially stores sheets moved thereto, an adhesive-binding unit that applies an adhesive onto sheets sequentially stored in the stacker section one by one in a sheet moving direction to bond the sheets to one another, a moving member that moves the sheets to an application position of the adhesive-binding unit, and a folding processing section that folds a sheet bundle formed by the bonded sheets at a predetermined folding position. When the number of sheets to be bonded by the adhesive-binding unit applying the adhesive onto the sheets exceeds a predetermined number, the adhesive is applied at two positions separated from each other across the folding position.

A sheet binding device includes a first tooth-shaped member that has plural arranged teeth, and a second tooth-shaped member that has plural arranged teeth, bites the first tooth-shaped member to clamp and bind sheets in cooperation with the first tooth-shaped member, and is tilted relative to the first tooth-shaped member from a beginning of biting to a completion of biting.

An image forming unit forms a user image and a bonding image formed in a binding margin of a booklet and is for bonding a plurality of sheets forming the booklet. A bonding unit bonds the plurality of sheets by applying heat and pressure to the binding margin of the plurality of sheets. The image forming unit forms the bonding image and forms the user image at a first density on a sheet that satisfies a condition for enabling bonding in the bonding unit from among the plurality of sheets. The image forming unit forms the user image and does not form the bonding image or forms the bonding image at a second density lower than the first density on a sheet that does not satisfy the condition for enabling bonding from among the plurality of sheets.

A control portion of an image forming apparatus creates an image list for performing the perfect-binding imposition of the images of the pages on the sheets so that the scores formed on the sheets are on the external surface of the center-folded sheets, for the sheets each having a size twice the size specified as each of the sheets on which the images of the book body are to be formed, when a book-body stacking portion accommodates the sheets center-folded by a folding portion along scores formed for every sheet from a predetermined direction by a scoring portion for each of the sheets having the images formed thereon by the image forming portion, and a bookbinding portion uses a glue-on cover to perform case binding of a bundle of the sheets glued to the side of the spine.

A finishing unit for applying a note onto a printed document that exits from an image forming apparatus is provided. The finishing unit, according to one embodiment, includes a note cutting unit for cutting a sheet of paper to a note of a desired size and a note pasting unit for applying the note onto the printed document that exits from the image forming apparatus. An image forming apparatus and method of applying a note onto a printed are also described.

A finishing unit for applying a note onto a printed document that exits from an image forming apparatus is provided. The finishing unit, according to one embodiment, includes a note cutting unit for cutting a sheet of paper to a note of a desired size and a note pasting unit for applying the note onto the printed document that exits from the image forming apparatus. An image forming apparatus and method of applying a note onto a printed are also described.