A saddle stitcher is provided. The saddle stitcher includes a saddle conveyor for transporting signatures and at least one signature guide located along the saddle conveyor. The signature guide includes a plurality of supports and at least one flexible member supported by the plurality of supports thereby defining a guide area. The at least one flexible member guides the signature in the guide area. Methods are also provided.

The present invention is to provide a sheet bundle binding device capable of easily removing some sheets from a sheet bundle that has been subjected to staple-free binding. A corner Sc of a first sheet bundle which is accumulated on a processing tray is subjected to proper binding using a staple needle by a staple binding unit. Then, a corner of a second sheet bundle obtained by accumulating additional sheets on the first sheet bundle is pressed and deformed between crimping toothed parts of a staple-free binding unit to temporarily bind the second sheet bundle. Thus, the additional sheets can easily be removed from the second sheet bundle.

The present invention is to provide a sheet processing device including: a receiving tray capable of accommodating therein a sheet having, at a part thereof, a protruding portion and a sheet not having the protruding portion in a mixed state; a first binding member that binds the accommodated sheet bundle at a substantially center thereof in a sheet conveying direction; a folding section that folds the sheet bundle bound by the first binding member in two; and a second binding member that binds protruding portions of the sheet bundle folded by the folding section on a fore edge side of the sheet bundle. With this configuration, the fore edge side of the folded and saddle-stitched sheet bundle can be bound by temporary binding. Thus, a sheet processing device capable of ensuring the security of a saddle-stitched sheet bundle can be provided.

A sheet processing apparatus includes a binder, a mover, and a posture changer. The binder binds a sheet bundle of multiple sheet media including a sheet medium conveyed to the binder in a conveyance direction. The mover moves the binder in an orthogonal direction orthogonal to the conveyance direction. The posture changer changes a posture of the binder that faces the sheet bundle, according to a change in a relative position between the posture changer and the binder in the orthogonal direction by a movement of the binder in the orthogonal direction.

A sheet processing apparatus includes: a control unit configured to control at least one of a pair of side edge alignment plates such that the one of the pair of side edge alignment plates is located at a position where the side edge alignment plate can come into contact with an inner side of a sheet in a widthwise direction, which is shifted by a shift unit.

A sheet processing apparatus includes a plurality of casters, a processing unit, another caster and a support portion. The plurality of casters movably support the sheet processing apparatus. The processing unit is provided to be capable of being drawn out from and inserted into the sheet processing apparatus. The other caster is provided in the processing unit and comes into contact with an installation surface and supports the processing unit in a case where the processing unit moves in a draw-out direction. The support portion supports the other caster such that the other caster is movable to an accommodation position and a support position and move the other caster from the support position to the accommodation position in accordance with an operation of inserting the processing unit.

A medium processing apparatus includes a liquid applier, a medium processing device, and circuitry. The liquid applier includes a liquid application member, a pressing member, and a detector. The liquid application member contacts a medium and apply liquid to the medium to perform liquid application. The pressing member moves the liquid application member, and press the liquid application member against the medium. The detector detects an amount of the liquid applied to the medium subjected to the liquid application. The medium processing device performs a predetermined process on a bundle of media subjected to the liquid application. The circuitry is to control the liquid applier and the medium processing device to set an amount of movement of the liquid application member and a contact time of the liquid application member to the medium, to set a control mode, and change the control mode according to the liquid amount.

A medium processing apparatus includes a liquid applier, a medium pressing unit, a detector, and circuitry. The liquid applier includes a liquid application member to contact a part of a medium and apply liquid to the part of the medium. The medium pressing unit presses the medium to which the liquid is applied, and moves the liquid application member relative to the medium. The detector detects a relative position between the medium pressing unit and the liquid application member. The circuitry is to determine a movement amount of the liquid application member relative to the medium based on the relative position detected by the detector, and move the liquid application member relative to the medium based on the movement amount.

A medium processing apparatus includes a liquid applier to apply liquid to a part of a medium to perform a liquid application, a medium processing device to perform desired processing on a bundle of media including the medium subjected to the liquid application, a liquid storage to store liquid used for the liquid application by the liquid applier, a liquid detector to detect an amount of liquid in the liquid storage, and circuitry to control a supply operation of supplying the liquid to the liquid applier to set a liquid applicable state in which the liquid applier can apply the liquid to the at least one medium based on information from the liquid detector. The circuitry changes a transition time to the liquid applicable state, based on the amount of liquid in the liquid storage detected by the liquid detector.

A medium processing apparatus includes a liquid applier to apply liquid to a part of a medium to perform liquid application, a first liquid storage to store the liquid used for the liquid application of the liquid applier, a second liquid storage to store the liquid to be supplied to the first liquid storage, and a liquid supplier to perform a liquid supply operation to supply the liquid from the second liquid storage to the first liquid storage. The second liquid storage includes a liquid storage tray connected to the liquid supplier, a liquid storage tank to store the liquid and is attachable to and detachable from the liquid storage tray, and a locking mechanism to restrict a position of the liquid storage tank attached to the liquid storage tray.