A medium aligning apparatus includes a load tray including a load surface on which a medium discharged from a discharge member that discharges a medium is loaded, a first aligning surface that aligns a plurality of mediums loaded on the load tray by positioning rear ends of the mediums, and a second aligning surface that aligns the mediums by positioning the rear ends of the mediums loaded on the load tray. In the medium aligning apparatus, the first aligning surface and the second aligning surface are switchable, and an angle formed between a wall surface in the discharge tray that receives the mediums discharged from the load tray, the wall surface having the rear ends of the mediums come in contact therewith, and the second aligning surface is smaller than an angle formed between the wall surface and the first aligning surface.

A medium-discharging device includes: a device main body including a medium-discharging section that discharges a medium; a medium-receiving tray that receives the medium discharged by the medium-discharging section; and a pressing member that is configured to be attached to and detached from to the device main body and presses the medium discharged by the medium-discharging section against the medium-receiving tray in a state in which the pressing member is attached to the device main body, in which the pressing member is configured to switch, in the state in which the pressing member is attached to the device main body, between a first state in which the pressing member comes into contact with the medium-receiving tray and a second state in which the pressing member retreats upward so as to be apart from the medium-receiving tray.

According to embodiments, a sheet post-processing apparatus includes a processing tray, a vertical alignment section, a horizontal alignment section and a controller. The controller is configured to control the horizontal alignment section to shift the sheet to a first alignment position a predetermined distance from the center of the processing tray in the sheet width direction, control the horizontal alignment section to align the sheet in the sheet width direction at the first alignment position, and control the vertical alignment section to align the sheet in the conveying direction at the first alignment position, control the horizontal alignment section to realign the sheet at the first alignment position.

A sheet alignment device includes a driven roller, a drive roller, a displacement driving device, an information acquisition portion, and a displacement control portion. The drive roller is configured to rotate in a first rotation direction and in contact with an upper surface of each of sheets conveyed onto a tilt tray, to feed the sheets toward a base end portion of the tilt tray. The drive roller is configured to rotate in a second rotation direction and in contact with an uppermost surface of the sheets, to discharge the sheets from the tilt tray. The displacement control portion is configured to, when the drive roller rotates in the first rotation direction, control a holding position of the drive roller in accordance with the number of the sheets on the tilt tray and thickness information of each of the sheets acquired by the information acquisition portion.

According to an embodiment, a sheet processing apparatus includes a transport unit and a holding unit. The transport unit transports a first sheet to a first position. The transport unit transports a second sheet, which is transported after the first sheet, to a second position displaced to the upstream side of a sheet transport direction relative to the first position. The transport unit transports a third sheet, which is transported after the second sheet, to a third position displaced to the downstream side of the sheet transport direction relative to the second position. In the case where the second sheet is transported to the second position, the holding unit holds the first sheet at the first position. In the case where the third sheet is transported to the third position, the holding unit holds the second sheet at the second position.

A sheet post-processing device comprises: a processing tray; a discharge tray; and a discharge rollers pair. The discharge rollers pair is constituted by a discharge roller which contacts the uppermost surface of sheets stacked in the processing tray and a discharge roller which contacts the lowermost surface of the sheets stacked in the processing tray). The sheet post-processing device discharges a sheet from the processing tray to the discharge tray by rotating the discharge rollers pair in the forward direction, and causes the sheet to be drawn into the processing tray by rotating the discharge roller in the reverse direction in a state in which the rotation of the discharge roller is stopped.

A sheet stacking tray includes a first stacking portion, a second stacking portion, and a base portion. In a sheet widthwise direction perpendicular to the sheet discharge direction, the first stacking portion includes a first sheet stacking surface having a first stacking width within a range from one half of a sheet width of a maximum-size sheet to be discharged up to the sheet width of the maximum-size sheet. The second stacking portion includes a second sheet stacking surface having a second stacking width smaller than the first stacking width. A border between the first stacking portion and the second stacking portion lies on a discharge-direction upstream side of a contact point where a leading end portion of the maximum-size sheet comes into contact with the sheet stacking part while the sheet is discharged.

An image forming apparatus includes a paper discharging tray and a paper detection part disposed at an upstream end of the paper discharging tray in a paper discharge direction. The paper detection part includes a base end member provided rotatably around a first axis extending in a direction perpendicular to a paper discharge direction and a tip member pivoted to the base end member to rotate around a second axis parallel to the first axis, and extending downwardly to incline toward an upstream side of the paper discharge direction in a state where the base end member is not subjected to pressure from the paper being discharged. The base end member is disposed to face a discharge opening when being at the reference position, and the image forming apparatus stops discharging paper from the discharge opening when the base end member rotates by a predetermined threshold or more with respect to the reference position.

The rotational pin and the lock pin are laterally provided in the right and left first brackets that are fixed to the right and left side surfaces of the sheet loading tray respectively, and furthermore, the right and left second brackets are fixed to the right and left of the one side surfaces of the casing. When the sheet loading tray reaches the sheet loading position, the lock pin is made to enter the sheet loading tray lock groove formed on the right and left second brackets to thereby lock and hold the sheet loading tray at the sheet loading tray storage position, along with an action of rotating the sheet loading tray about the rotational pin fitting into the sheet loading tray support groove formed on the right and left second brackets from the sheet loading position to the sheet loading tray storage position.

A printing apparatus can prevent a print medium from buckling during discharging. In a case in which the print conveyance speed determined by the print mode is higher than or equal to a specified speed, the print medium after printing is conveyed to a discharging tray at the print conveyance speed, and in a case in which the print conveyance speed determined by the print mode is lower than the specified speed, the print medium after printing is conveyed to the discharging tray at the specified speed increased from the print conveyance speed.