A floating clamp mechanism prevents sheets from migrating back from a lead edge registration wall during the compiling of sheets in a stacker. The floating clamp mechanism includes a spring loaded ball mounted in converging upper and lower tracks that act as a one-way clutch. This allows the incoming sheets to be scuffed with low force to the lead edge registration wall while simultaneously holding the registered sheets to the registration wall.

A sheet post-processing device includes a conveying section that conveys a paper sheet; a punch section that punches punch holes in the paper sheet conveyed by the conveying section; a stacker section that stores the paper sheet in which the punch holes are punched by the punch section; a binding section that binds a paper sheet bundle stored in the stacker section with a binding member; and a controller that controls the above sections. The controller selectively performs a ring binding mode and a direct binding mode. The ring binding mode is a mode in which punch holes are punched in the paper sheet by the punch section and then the binding member is made to penetrate the punch holes for binding. The direct binding mode is a mode in which the binding member is directly driven into the paper sheet bundle without punching the punch holes in the sheet.

A sheet conveying apparatus, including: a support portion configured to support a second sheet different from a first sheet among a plurality of sheets when the first sheet located undermost among the plurality of sheets conveyed by a conveyance portion is placeable on a placement portion; and a restriction unit configured to bring the second sheet into a first state in order to restrict downward movement of the second sheet at a restriction position located downstream of a support position at which the support portion supports the second sheet when the first sheet is placeable on the placement portion, and to bring the second sheet into a second state in order to remove or reduce a restriction force for restricting the downward movement of the second sheet to less than a restriction force in the first state after bringing the second sheet into the first state at the restriction position.

An image forming system includes a detection unit to detect a recording material, having an image formed thereon by an image forming unit, placed on a processing tray, a staple unit, a discharge unit, and a discharge tray. A first mode of the system is to discharge the recording material conveyed from the image forming unit to the discharge tray via the processing tray and a second mode involves waiting for instruction for executing. When the detection unit detects the recording material inserted into the processing tray in the second mode, and a recording material first mode conveying instruction is issued in a state of waiting for the executing instruction after the recording material detection, a discharge operation is performed to discharge the recording material inserted into the processing tray to the discharge tray without the staple unit executing staple processing on the recording material inserted into the processing tray.

A post-processing apparatus configured to collect printed sheets ejected from an image forming apparatus and to handle the printed sheets. The post-processing apparatus has: a stacker configured to collect and stack a plurality of printed sheets with one end of each of the printed sheets placed down; a movable stopper configured to stop each of the printed sheets sliding down in the stacker at a specified position; a motor configured to move the stopper along the stacker and stops the stopper; and a control unit configured to control the motor. The control unit increases a current supplied to the motor in preparation for a collision between each of the printed sheets and the stopper.

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 medium processing apparatus includes a liquid applier, a medium processing device, circuitry, and a freezing detector. The liquid applier applies liquid to a part of a medium to perform a liquid application. The medium processing device performs desired processing on a bundle of media including the medium subjected to the liquid application. The circuitry controls the liquid application and the desired processing. The freezing detector notifies the circuitry of freezing information including a frozen state of the liquid. The circuitry selects, based on the freezing information, one of first processing that is the desired processing performed on the bundle of media including the medium subjected to the liquid application or second processing that is the desired processing performed on the bundle of media without subjecting the medium to the liquid application.

A post-processing apparatus includes a post-processing device, a sound collector, and circuitry. The post-processing device performs a post-processing operation on a sheet. The sound collector collects and inputs an operating sound of the post-processing operation performed by the post-processing device. The circuitry is to determine whether the operating sound input from the sound collector is normal or abnormal, output an error notification that the post-processing operation is abnormal when the operating sound is determined to be abnormal, and control the post-processing device to end the post-processing operation when the operating sound is determined to be normal.

A sheet processing apparatus includes: a folding device that folds a sheet bundle which is formed of multiple sheets stacked on each other; and a stapleless binding device including a binding unit that binds the sheet bundle at a position of a portion near a fold line without using a staple, the fold line being formed as a result of the folding device folding the sheet bundle.

An image forming apparatus accepts a selection of a first mode for forming a toner image for adhering foil onto a sheet via the toner image and an input of information relating to post-processing. The apparatus forms the toner image on the sheet. The apparatus displays a warning on a display according to the information relating to the post-processing, when the first mode is selected by the input unit.