In a sheet feeder that feeds a sheet to an image forming apparatus, a sheet placing table has a placement surface on which a sheet is placed and is inclined downward toward a downstream side in a sheet feeding direction. A sheet detecting unit has an operation piece that presses a leading end of the sheet toward an upstream side in the sheet feeding direction with predetermined pressure. A regulating member is arranged in a vicinity of an end part of the sheet placing table on the upstream side in the sheet feeding direction. The regulating member regulates movement of the sheet to the upstream side in the sheet feeding direction and has regulating portions having different heights from the placement surface of the sheet placing table. The regulating portions are arranged so that the heights are increased toward the upstream side in the sheet feeding direction.

The document conveying apparatus includes a body, a document tray, a guiding tray, a first support member that supports the document tray movably between a open position where a document is placed on the first document stacking face, and a close position where the document tray is closed, and a second support member that supports the guiding tray. The second support member positions the guiding tray at a first distance from the document tray, when the document tray is at the open position. The second support member positions the guiding tray at a second distance from the document tray, when the document tray is at the close position. The second distance is smaller than the first distance.

A sheet feed device has a tray with holding surface for holding sheets, a feed unit for feeding sheets from the tray, and a separation plate. The separation plate has an inclined surface and two or more separation portions that separate a sheet from the sheets held in the tray. At least one of the separation portions projects a first distance from the inclined surface. The separation plate also has a projection positioned on the inclined surface that projects a second distance from the inclined surface. The second distance is greater than the first distance. A first of the separation portions is positioned upstream of the particular projection in the sheet feed direction, and a second of the separation portions positioned downstream of the particular projection in the sheet feed direction.

A sheet discharge apparatus includes a discharge unit, a supporting portion, and a regulation portion. The discharge unit is configured to discharge a sheet. The supporting portion is configured to support the discharged sheet. The regulation portion is configured to regulate a trailing edge position of the discharged sheet in a sheet discharge direction. The supporting portion includes a base surface, a first projection portion, and a second projection portion. The first projection portion projects from the base surface, is disposed downstream of the regulation portion in the sheet discharge direction, and extends in a width direction orthogonal to the sheet discharge direction. The second projection portion projects from the base surface, is disposed downstream of the first projection portion in the sheet discharge direction with a predetermined interval from the first projection portion, and is shorter than the first projection portion in the width direction.

An image forming apparatus includes an image forming portion forming an image on an envelope having a flap, and a guide portion composing a sheet conveyance path through which the envelope is conveyed and having a plurality of ribs projecting from a base plane thereof to the sheet conveyance path. Each of the plurality of ribs is disposed aslant such that a downstream end thereof in a sheet conveying direction is located at a widthwise side end more than an upstream end thereof and includes an inclined surface inclined with respect to a base plane on a side surface upstream in the sheet conveying direction of the ribs. The inclined surface is formed such that 0<a45 holds, where a denotes an inclination angle of the inclined surface with respect to the base plane in the sheet conveying direction.

An image forming apparatus includes an output unit to which a recording medium on which an image has been formed is output, the output unit including an output unit body, and an extension portion that is disposed on the output unit body so as to be extendable from the output unit body in an output direction of the recording medium, the extension portion including a handle portion that is recessed in a direction away from a back surface of the recording sheet so as allow a finger to be hooked in a direction in which the extension portion is extended in the output direction of the recording medium, the back surface being a surface that is in contact with the output unit body, and a protrusion that protrudes toward the back surface of the recording medium from the extension portion.

A sheet post-processing device for post-processing of a recording sheet ejected from an image forming device in an ejection direction, the sheet post-processing device including: a first tray on which the recording sheet is placed after ejection; a push-out member that pushes out, in a push-out direction different from the ejection direction, the recording sheet placed on the first tray; and a guide member adjacent to an ejection direction downstream end of the first tray, the guide member supporting a portion of the recording sheet that protrudes from the first tray in the ejection direction. The guide member includes a resistive force reduction unit that reduces a resistive force that occurs due to contact between the guide member and the recording sheet, the resistive force hindering the pushing out of the recording sheet when the push-out member pushes out the recording sheet.

A stacking unit includes a processing tray, an alignment section, a transport section, and a moving section. The processing tray has a placement area in which one or more paper sheets are placed. The alignment section aligns leading edges of the paper sheets. The transport section transports the paper sheets to the alignment section. The moving section moves the paper sheets in X directions. The alignment section includes: a first alignment surface having a first friction coefficient; and a second alignment surface having a second friction coefficient. The second alignment surface is positioned upstream of the first alignment surface in a +A direction and closer to a center of the placement area in the X directions than the first alignment surface is.

A sheet discharge apparatus includes a discharge unit, a supporting portion, and a regulation portion. The discharge unit is configured to discharge a sheet. The supporting portion is configured to support the discharged sheet. The regulation portion is configured to regulate a trailing edge position of the discharged sheet in a sheet discharge direction. The supporting portion includes a base surface, a first projection portion, and a second projection portion. The first projection portion projects from the base surface, is disposed downstream of the regulation portion in the sheet discharge direction, and extends in a width direction orthogonal to the sheet discharge direction. The second projection portion projects from the base surface, is disposed downstream of the first projection portion in the sheet discharge direction with a predetermined interval from the first projection portion, and is shorter than the first projection portion in the width direction.

A sheet feeder includes a sheet feeding unit configured to feed a sheet from a sheet storage case in a sheet feeding direction orthogonal to a loading direction in which the sheet storage case is loaded into an apparatus main body, and a conveying guide configured to guide the sheet fed by the sheet feeding unit. The conveying guide includes a first guide segment included in the apparatus main body and a second guide segment included in the sheet storage unit. The sheet feeder further includes an edge guide member disposed at an end of the first guide segment. The edge guide member has a guide surface that allows reaction force including a directional force component acting upward and a directional force component acting in a direction opposite to the sheet feeding direction to be generated when the sheet partly projecting from the sheet storage case abuts the guide surface.