In order to provide a sheet stacking apparatus for maintaining alignment characteristics of long-length sheets, the sheet stacking apparatus is a sheet stacking apparatus located above in a pair of sheet stacking apparatuses provided to overlap vertically along a vertical direction, and is provided with a first stacking section for stacking sheets, a second stacking section provided to extend from a downstream end of the first stacking section in a sheet transport direction and connected to the first stacking section rotatably, and a third stacking section which is attached to the second stacking section to extend from a downstream end of the second stacking section in the sheet transport direction, includes an inclined angle with respect to a horizontal surface smaller than in the second placing face, and which is attachable and detachable with respect to the second stacking section in a rotation direction.

An image forming apparatus includes a discharge tray, a sheet contact plate, an arm, a slider, and a spring. The sheet contact plate includes a first end portion and a second end portion located downstream in a sheet discharge direction and is pivotable about a first axis located at the first end portion between a retracted position and a protruding position. The arm includes a third end portion and a fourth end portion. The third end portion is supported by the second end portion of the sheet contact plate such that the arm is pivotable about a second axis located at the third end portion. The slider supports the fourth end portion of the arm such that the arm is pivotable about a third axis located at the fourth end portion. The spring urges the slider away from the first axis along the sheet discharge direction.

A sheet housing apparatus including a housing unit, which houses a sheet to be discharged from a discharging opening of a printer, and a pair of housing-side feet disposed on both sides, in a width direction, of the sheet housing apparatus. The sheet housing apparatus can be combined with the printer. The printer includes a pair of body-side feet disposed on both sides, in the width direction, of the printer. In a state in which the sheet housing apparatus is combined with the printer, the body-side feet and the housing-side feet are arranged not to overlap with each other in the width direction.

A sheet feed device includes: a tray provided in a device body in a manner capable of being pulled out and having a loading part that is moved up and down; an extension part attached to the device body to support a portion of a sheet to be fed through the tray; a lifting mechanism that has a lifting/lowering part for moving the loading part up and down and a driving part for lifting and holding the loading part via the lifting/lowering part; and a disconnecting part that disconnects the lifting/lowering part and the driving part when an uncoupling operation is accepted in a state in which the tray is accommodated in the device body.

A sheet accommodating apparatus includes a main body portion, a loading portion that is provided in the main body portion and supports a portion of a sheet loaded thereon from below, a lifting unit that lifts the loading portion, and a supporting portion that is connected to the main body portion and supports another portion of the sheet from below during a process in which the loading portion is lifted.

A sheet accommodating apparatus includes a loading portion onto which a sheet is loaded, a lifting and lowering unit that lifts and lowers the loading portion, a raising portion that raises a sheet loading surface with respect to a lowermost lowering position of the loading portion and above which a portion of the sheet is loaded, and an extension portion that extends to a position outward of the loading portion from the raising portion side as seen in plan view and supports another portion of the sheet.

An image forming apparatus includes a discharging tray for supporting a sheet, an operation panel and a supporting member. The sheet is discharged toward a sheet discharging direction that is a direction toward which the sheet is discharged. The operation panel is located at a position which is different from the position of the discharging tray in a width direction orthogonal to the sheet discharging direction and above the discharging tray. The supporting member is disposed at the discharging tray and capable of supporting the discharged sheet with the discharging tray. A front end portion of the supporting member is located above an upper surface of the discharging tray. At least a part of the front end portion of the supporting member overlaps the operation panel when viewed in the width direction.

A sheet housing apparatus including a housing unit, which houses a sheet to be discharged from a discharging opening of a printer, and a pair of housing-side feet disposed on both sides, in a width direction, of the sheet housing apparatus. The sheet housing apparatus can be combined with the printer. The printer includes a pair of body-side feet disposed on both sides, in the width direction, of the printer. In a state in which the sheet housing apparatus is combined with the printer, the body-side feet and the housing-side feet are arranged not to overlap with each other in the width direction

An image reading apparatus includes an original tray, an original feeding portion, an original reading portion, an original discharging portion, an original discharge tray, an extension tray, and a rotation guide. A stacking surface of the original discharge tray is provided with an opening through which the rotation guide is capable of passing when the rotation guide rotates from a first position to a second position. In a state in which the extension tray is held at a pulled-out position, the rotation guide is rotatable relative to the extension tray from the first position toward the second position. In a state in which the extension tray is held at an accommodated position, the rotation guide is rotatable from the first position toward the second position by passing through the opening.

A sheet housing apparatus including a housing unit, which houses a sheet to be discharged from a discharging opening of a printer, and a pair of housing-side feet disposed on both sides, in a width direction, of the sheet housing apparatus. The sheet housing apparatus can be combined with the printer. The printer includes a pair of body-side feet disposed on both sides, in the width direction, of the printer. In a state in which the sheet housing apparatus is combined with the printer, the body-side feet and the housing-side feet are arranged not to overlap with each other in the width direction.