A controller of a sheet stacking device executes tray elevating processing and sheet stacking processing. The tray elevating processing is processing in which when a sensor detects an uppermost sheet, the controller once lowers a stacking tray, and lifts the stacking tray until the sensor detects the uppermost sheet. The sheet stacking processing is processing in which the controller arranges a guide arm at an advanced position to guide the sheet, arranges the guide arm at a retracted position before a rear end of the sheet passes the sheet discharge portion, and stacks the sheet on the stacking tray after the rear end of the sheet passes the sheet discharge portion. The controller executes the tray elevating processing in a state where the guide arm is disposed at the advanced position during the execution of the sheet stacking processing.

A sheet folding processing device includes a folding processing mechanism that includes a folding roller pair for forming a plurality of folds on the sheet conveyed in a predetermined sheet conveying direction to produce Z-fold, additional folding rollers and a lower folding guide. The additional folding rollers and the lower folding guide are arranged on the downstream side of the folding roller pair in the sheet conveying direction to face each other and cooperate with each other to press the folds. The interval between the folding roller pair and the additional folding rollers is determined such that when the leading fold as viewed in the sheet conveying direction is pressed between the additional folding rollers and the lower folding guide, the sheet part having a plurality of layers of sheet where the sheet is folded between the additional folding rollers can also be held between the folding roller pair.

A printing device includes, in one example, a media output system including a mezzanine level including a plurality of media support members, the mezzanine level being intermediate to a floor level and a media output level; wherein the plurality of media support members move orthogonally relative to a print media path so that a number of finishing processes may be performed on print media accumulated on the number of media support members.

An example finisher includes a first portion extending in a vertical direction, a second portion including an entrance to receive paper as a finishing process target, and a finishing unit to perform a finishing process, the second portion extending from the first portion in a lateral direction, a stacker to receive paper discharged from the finishing unit and which extends in an opposite direction to the second portion based on the first portion, and an elevation driving unit provided on the first portion to elevate the stacker in a vertical direction.

Disclosed herein is a sheet-binding apparatus. The apparatus has two sheet binding units, each configured to bind the sheets manually inserted from outside. The sheet binding units operate independently, each at the timing appropriate for a specific need.

A sheet binding unit includes a first sheet binder having first and second dentate uneven sheet binding elements to conduct a first sheet binding process by engaging each other by a prescribed meshing depth while sandwiching the sheet bundle therebetween to form a dentate unevenness on the sheet bundle at a first sheet binding portion of the sheet bundle, and a second sheet binder having third and fourth dentate uneven sheet binding elements to conduct a second sheet binding process by engaging each other by a greater meshing depth than that made by first and second dentate uneven sheet binding elements of the first sheet binder while sandwiching the sheet bundle therebetween to form a dentate unevenness on the sheet bundle at a second sheet binding portion different from the first sheet binding portion of the sheet bundle.

A controller of a sheet stacking device executes tray elevating processing and sheet stacking processing. The tray elevating processing is processing in which when a sensor detects an uppermost sheet, the controller once lowers a stacking tray, and lifts the stacking tray until the sensor detects the uppermost sheet. The sheet stacking processing is processing in which the controller arranges a guide arm at an advanced position to guide the sheet, arranges the guide arm at a retracted position before a rear end of the sheet passes the sheet discharge portion, and stacks the sheet on the stacking tray after the rear end of the sheet passes the sheet discharge portion. The controller executes the tray elevating processing in a state where the guide arm is disposed at the advanced position during the execution of the sheet stacking processing.

A sheet processing apparatus, including: a rotary member pair configured to nip a sheet conveyed in a conveyance path and rotate to fold the sheet; and a guide portion provided between one rotary member of the rotary member pair and the conveyance path, the one rotary member including: a first part; and a second part, wherein a first distance between the first part and a rotary shaft center of the one rotary member is greater than a second distance between the second part and the rotary shaft center, and wherein the guide portion is positioned at a first position in case that the second part is positioned at a first rotational position, and the guide portion is positioned at a second position different from the first position in a distance from the rotary shaft center in case that the second part is positioned at a second rotational position.

A post-processing apparatus includes a loading tray, a post-processing unit for performing predetermined post-processing on a sheet before ejecting the sheet onto the loading tray, and a drawing paddle for sending the sheet conveyed toward the loading tray in a direction opposite to the conveying direction to draw the sheet to a predetermined position on a processing tray. The drawing paddle includes a paddle rotation shaft disposed above the processing tray with a predetermined distance from the processing tray, and a paddle blade fixed to the paddle rotation shaft. The paddle blade is a laminated body including an elastic sheet to be in contact with the sheet to be post-processed and a reinforcing sheet reinforcing the elastic sheet. The elastic sheet has a first length longer than the predetermined distance and the reinforcing sheet has a second length shorter than the predetermined distance.

A sheet processing apparatus, including: a conveyance path in which a sheet is conveyed in a predetermined conveyance direction; a rotary member pair configured to nip the sheet conveyed in the conveyance path and rotate to perform folding processing on the sheet; and a guide portion provided between one rotary member of the rotary member pair and the conveyance path and configured to guide a downstream edge of a sheet conveyed in the predetermined conveyance direction, wherein, in case that a sheet is conveyed in the conveyance path in the predetermined conveyance direction, the guide portion guides a downstream edge of the sheet in the predetermined conveyance direction in a state in which the guide portion is held in contact with the one rotary member.