An image forming apparatus includes an image forming portion, a fixing portion configured to heat the toner image formed on the sheet by the image forming portion and fix the toner image to the sheet, a folding portion configured to fold the sheet having passed through the fixing portion such that a surface of the sheet to which the powder adhesive is applied is inside, and a bonding portion configured to heat the sheet folded by the folding portion and bond the sheet by the powder adhesive. A relationship of Tmax1>Tmax2 is satisfied, where Tmax1 (° C.) is a highest temperature of the powder adhesive when being heated by the fixing portion and Tmax2 (° C.) is a highest temperature of the powder adhesive when being heated by the bonding portion.

The present sheet processing apparatus is to obtain that folding in the center portion in the width direction of sheets is made, folding in the end portion is made more reliably by repeatedly pressing the end portion in the width direction, the folded sheets are harder to open, the appearance is also enhanced, and that collection characteristics are improved in stacking bunches of folded sheets, a sheet processing apparatus is provided with pairs of press members (press rollers 70) that press a folded loop BL of folding sheets BS, and a support unit 56 that shifts in the width direction of the folding sheets, while supporting a plurality of rows with a distance between the press members narrowed stepwise in the shift direction.

An image forming apparatus includes, an image forming portion configured to form a toner image on a sheet using printing toner and apply powder adhesive on the sheet, a fixing portion configured to heat the toner image formed on the sheet and the powder adhesive applied on the sheet by the image forming portion and fix the toner image and the powder adhesive to the sheet, and a bonding portion configured to bond the sheet with the powder adhesive by reheating the sheet having been heated by the fixing portion. The bonding portion is arranged above the image forming portion.

A sheet processing apparatus that can suppress a reduction in a quality of a finish of a fold part of a stack of center-folded sheets without losing an ease of center-folding. The sheet processing apparatus comprises a creasing unit for forming a folding stripe on a sheet so as to facilitate folding the sheet, and an acquisition unit for acquiring information related to a thickness of the sheet. One or more sheets to be provided with folding stripes are determined, from among a plurality of sheets to be folded, according to the information related to the thickness of the sheets, and each of the determined one or more sheets are provided with a folding stripe.

A post-processing apparatus includes a post-processing unit configured to receive sheets from an image forming apparatus, perform processing on the received sheets, and then discharge the processed sheets through a discharge port. A sensor is configured to detect a presence of an object at the discharge port. The sensor includes a first light emitter on a first side of the discharge port that is positioned to emit a light across a width of the discharge port, a reflector on a second side of the discharge port opposite the first side in a first direction, and a first light receiver positioned to receive light of the first light emitter from the reflector. A controller is configured to terminate the processing on the received sheets by the post-processing unit when the sensor detects the presence of the object at the discharge port.

The present invention provides a recording medium detecting device, an image forming device, an image forming system, a recording medium detecting method, and a non-transitory recording medium storing a computer readable program capable of detecting a grain direction of a recording medium. A recording medium detecting device has: a sensor capable of detecting a recording medium from a first detection direction and a second detection direction different from the first detection direction; and a control unit. The control unit determines a grain direction of a recording medium from first surface property data obtained when the recording medium is detected from the first detection direction and second surface property data obtained when the recording medium is detected from the second detection direction.

An image forming apparatus includes, an image forming portion configured to form a toner image on a sheet using printing toner and apply powder adhesive on the sheet, a fixing portion configured to heat the toner image formed on the sheet and the powder adhesive applied on the sheet by the image forming portion and fix the toner image and the powder adhesive to the sheet, and a bonding portion configured to bond the sheet with the powder adhesive by reheating the sheet having been heated by the fixing portion. The bonding portion is arranged above the image forming portion.

A postprocessing device includes a pair of folding rollers, a folding blade, a transport device, a roller driver, a blade driver, and a drive controller. The drive controller selectively performs one of a first rotation control, including controlling the roller driver to keep rotation speed of the pair of folding rollers constant, while the folding blade is moving away from a nip region, and a second rotation control, including controlling the roller driver to stop the rotation or slow down the rotation speed of the pair of folding rollers, while a tip portion of the folding blade is being withdrawn from a folded portion of a sheaf of sheets folded, and to restore the rotation speed of the pair of folding rollers to original rotation speed, after the tip portion of the folding blade has been removed from the folded portion of the sheaf of sheets folded.

An image forming system includes an image forming apparatus, a pressure sealing processing apparatus, and a control unit. The control unit is configured to permit execution of the pressure sealing processing process by the pressure sealing processing apparatus on a recording material of which a grammage is smaller than a predetermined grammage, and is configured not to permit execution of the pressure sealing processing process by the pressure sealing processing apparatus on a recording material of which a grammage is equal to or more than the predetermined grammage.

A post-processing apparatus according to an embodiment includes a processing tray, a post-processing section, a sensor, and a control section. A sheet supplied from an image forming apparatus is led into the processing tray through a lead-in path. The post-processing section applies post-processing to the sheet sent from the processing tray. The sensor detects an object passing a detection space in the lead-in path. The control section controls operation of the post-processing section based on a time in which the sensor detects the object.