An image forming apparatus includes: a conveyance section configured to convey a sheet in a direction opposite to a first conveyance direction during image formation, the direction being a second conveyance direction; and a distortion correction section disposed on an upstream side of a transfer nip in the first conveyance direction and configured to correct, when the sheet is conveyed by the conveyance section in the second conveyance direction, distortion of the sheet generated when the sheet passes through a fixing nip.

An image forming apparatus includes an image bearing member, a belt, a contact member, a rotation shaft member, a cam, an opposing member, and a damper. The belt receives a toner image from the image bearing member. The cam rotates in tandem with the rotation shaft member and contacts or separates the contact member and the belt. The opposing member is disposed to face the rotation shaft member in a direction intersecting with a rotation shaft member shaft direction. The damper member has a first flexible portion and a second flexible portion that are elastically deformable by contacting with the opposing member. In either contact operation or separation operation of the contact member to/from the belt, the damper member rotates in tandem with rotation of the rotation shaft member so that both the first flexible portion and the second flexible portion contact with the opposing member and are elastically deformed.

A paper humidifier includes a humidifying roller, a water supply roller, a suction roller and an intermediate roller. The humidifying roller comes in contact with a sheet and humidifies the sheet. The water supply roller is in contact with the humidifying roller and transfers water to the humidifying roller. The suction roller is partially dipped into water stored in a water reservoir. The intermediate roller is provided between the water supply roller and the suction roller, and is in contact with the water supply roller and the suction roller respectively. The intermediate roller is located above a liquid level of the water stored in the water reservoir. An outer peripheral surface of the suction roller, which rises out of the water stored in the water reservoir after being dipped in the water, rotates in a direction away from the water supply roller.

A sheet feeding apparatus includes a sheet storage portion, a sheet supporting member that is liftable, and a damper mechanism including a resistance member and a movable portion movable by abutting against a body of the apparatus. The damper mechanism resists, at least temporarily, relative movement of the movable portion and the sheet storage portion by applying resistive force produced by the resistance member to the movable portion in a case where the sheet storage portion is inserted to the body, and resists, at least temporarily, lowering movement of the sheet supporting member by applying resistive force produced by the resistance member to the sheet supporting portion in a case where the sheet storage portion with the sheet supporting member having been lifted by the lift portion is drawn out of the body.

A medium processing apparatus includes a liquid applier, a post-processing device, and a controller that is circuitry. The liquid applier applies liquid on at least one medium. The post-processing device performs a combination of various types of post-processes including a liquid application crimp binding and a crimp binding and a various types of bindings including a dual binding, a parallel binding, and an oblique binding, on a bundle of media including the at least one medium for a number of times. The circuitry is to change the number of times of the post-process according to the combination of the various types of the post processes and the various types of bindings, to be performed.

A medium processing apparatus includes a liquid applier and a post-processing device. The liquid applier includes a liquid application member including a foam containable a liquid to apply the liquid to a liquid application region in a part of at least one medium of a bundle of media. The post-processing device performs a given process on a post-processing region in the part of at least one medium having the liquid application region on which the liquid is applied by the liquid applier. The liquid applier applies the liquid to the liquid application region overlapped with at least a part of the post-processing region.

An image forming apparatus comprises a housing, a cassette insertable into the housing to store printing sheets; an automatic mounting apparatus provided between the housing and the cassette and to allow the cassette to be mounted thereon, where the automatic mounting apparatus comprises an engaging portion configured to protrude on a side surface of the cassette, a rail portion provided in the housing, and a locking device provided at the rear side of the rail portion to interfere with the engaging portion.

A damper mechanism has first and second rail members, a biasing member, and a slide member. The first rail member is fixed inside the opening/closing member along the up/down direction, and has an oblong guide hole formed therein extending along the longitudinal direction. The second rail member has fixed to a top end part thereof an engaging pin inserted through the guide hole, and has a bottom end part swingably supported on the apparatus main body. The biasing member biases the first and second rail members in a direction in which these approach each other. The slide member is made of resin fixed to the engaging pin, slides while in contact with the first rail member and the opening/closing member, and prevents contact between the engaging pin and an inner circumferential rim of the guide hole.

A paper humidifier includes a humidifying roller, a water supply roller, a suction roller and an intermediate roller. The humidifying roller comes in contact with a sheet and humidifies the sheet. The water supply roller is in contact with the humidifying roller and transfers water to the humidifying roller. The suction roller is partially dipped into water stored in a water reservoir. The intermediate roller is provided between the water supply roller and the suction roller, and is in contact with the water supply roller and the suction roller respectively. The intermediate roller is located above a liquid level of the water stored in the water reservoir. An outer peripheral surface of the suction roller, which rises out of the water stored in the water reservoir after being dipped in the water, rotates in a direction away from the water supply roller.

A paper humidifying apparatus includes humidifying rollers, a first drive unit and a controller. The humidifying rollers, forming a pair, are pressed against each other forming a nip portion and apply moisture to a sheet of paper when sandwiching and conveying the sheet of paper. The first drive unit which makes the humidifying rollers separate from each other or press against each other. The controller controls the first drive unit. The controller controls the first drive unit so as to make the humidifying rollers separate from each other and receive the sheet of paper, and after a tip of the sheet of paper passes a position corresponding to the nip portion, the controller controls the first drive unit so as to make the humidifying rollers press against each other to apply moisture to the sheet of paper.