A device for processing a spine of a book block suspended from a circulating clamp on a conveyor of a bookbinding machine includes a processing device positioned opposite the clamp and facing the spine of the book block. A tensioning device is includes a fixed support roller to act perpendicularly on one side of the clamp and an overhang of the book block, and an adjustable pressing roller to act perpendicularly on another side of the clamp and the overhang of the book block. A controlled adjusting device is connected to the adjustable pressing roller. The controlled adjusting device adjusts the adjustable pressing roller based on a thickness of the book block.

A sheet processing apparatus operable to perform creasing processing on media, and a method of controlling the same, accept an offset position of a crease for folding of a cover of a bookbinding product which is a length from an edge of a spine of the bookbinding product, and acquire a position of the crease for folding corresponding to the cover using at least a size of the cover, the offset position, and a thickness of the bookbinding product. Based on the acquired position of the crease, creasing processing is executed on the cover.

An image forming apparatus determines whether crease processing at a plurality of portions set on the sheet includes crease processing on two, front and back surfaces of the sheet; determines, if it is determined that crease processing includes crease processing on the two surfaces of the sheet, whether a connected post-processing apparatus that performs crease processing on a sheet can perform crease processing on the two, front and back surfaces of the sheet by one feeding; and controls, if it is determined that the connected post-processing apparatus cannot perform crease processing on the two surfaces by one feeding, to change, to one of the front and back surfaces of the sheet based on attribute information of the sheet, a surface to be processed in crease processing at the plurality of portions.

The creaser 2 includes a project part 21 for forming the crease 120 on the sheet 101 and a receive part 22 for receiving the project part 21. The project part 21 is moved between a crease position and a standby potion, the project part 21 being at the crease position so as to form the crease 120 on the sheet 101, the project part 21 being away from the sheet 101 at the standby position so as not to form the crease 120 on the sheet 101. The input device 6 includes a selector 60 for selecting the sheet 101 to be creased by the creaser 2 from among the sheets 101 fed from the conveyer 1, the input device 6 sending the information of the selection to the controller 5.

An image forming apparatus determines whether crease processing at a plurality of portions set on the sheet includes crease processing on two, front and back surfaces of the sheet; determines, if it is determined that crease processing includes crease processing on the two surfaces of the sheet, whether a connected post-processing apparatus that performs crease processing on a sheet can perform crease processing on the two, front and back surfaces of the sheet by one feeding; and controls, if it is determined that the connected post-processing apparatus cannot perform crease processing on the two surfaces by one feeding, to change, to one of the front and back surfaces of the sheet based on attribute information of the sheet, a surface to be processed in crease processing at the plurality of portions.

A sheet processing apparatus includes a sheet holding unit, a sheet conveying unit configured to convey a plurality of sheets one by one onto the sheet holding unit during sheet processing, wherein the plurality of sheets includes a first sheet and a second sheet that is conveyed immediately after the first sheet, an adhesive applying unit configured to apply an adhesive material on the first sheet held on the sheet holding unit before the second sheet is conveyed onto the first sheet, and a pressing unit configured to press the second sheet against the first sheet after the second sheet is conveyed onto the first sheet.

A sheet processing apparatus includes a sheet holding unit, a sheet conveying unit configured to convey a plurality of sheets one by one onto the sheet holding unit during sheet processing, wherein the plurality of sheets includes a first sheet and a second sheet that is conveyed immediately after the first sheet, an adhesive applying unit configured to apply an adhesive material on the first sheet held on the sheet holding unit before the second sheet is conveyed onto the first sheet, and a pressing unit configured to press the second sheet against the first sheet after the second sheet is conveyed onto the first sheet.

A conveyance roller conveys a plurality of sheet groups, each to which a bonding agent has been applied. A sheet holder holds the plurality of sheet groups by stacking a subsequent sheet group on a preceding sheet group. A thermocompression bonding unit produces a booklet by applying heat and pressure to the plurality of sheet groups held in the sheet holder. A controller obtains sheet information indicating a type of sheet or a conveyance duration of a preceding sheet group among a plurality of sheet groups, and controls a thermocompression bonding parameter to be applied to at least one subsequent sheet group of the preceding sheet group among the plurality of sheet groups in the thermocompression bonding unit based on the sheet information.

A conveyance roller conveys a plurality of sheet groups, each to which a bonding agent has been applied. A sheet holder holds the plurality of sheet groups by stacking a subsequent sheet group on a preceding sheet group. A thermocompression bonding unit produces a booklet by applying heat and pressure to the plurality of sheet groups held in the sheet holder. A controller obtains sheet information indicating a type of sheet or a conveyance duration of a preceding sheet group among a plurality of sheet groups, and controls a thermocompression bonding parameter to be applied to at least one subsequent sheet group of the preceding sheet group among the plurality of sheet groups in the thermocompression bonding unit based on the sheet information.

A printing system comprises: a printing unit configured to print an image on a sheet; and a control unit configured to control to perform creasing at a first pressure at a portion, corresponding to an edge of a spine cover, of the sheet on which the printing unit has printed the image, and perform creasing at a second pressure different from the first pressure at a portion of the sheet that corresponds to a hinge.