Disclosed is a sheet feeding apparatus configured to be attached to an image forming apparatus. The sheet feeding apparatus includes a frame body and a locking member provided on an upper part of the frame body, the locking member being configured to be movable between a locking position where the frame body is locked to the image forming apparatus and a releasing position where the locking of the frame body is released, wherein in attaching the heating unit to an attaching position of the frame body, the locking member is configured to restrict a movement of the heating unit to the attaching position by interfering with the heating unit when the locking member is located at the releasing position and to allow a movement of the heating unit to the attaching position when the locking member is located at the locking position.

A sheet feeding apparatus includes a sheet storing tray for loading sheets, an apparatus main body to which the sheet storing tray is slidably attached, and a restriction mechanism that restricts a position of the sheet storing tray. The restriction mechanism includes an engagement portion provided in the apparatus main body and a stopper member that is provided in the sheet storing tray and engages with the engagement portion. The stopper member is configured so as to be movable in a crossing direction crossing a direction in which the sheet storing tray slides and determines a position in the crossing direction of the sheet storing tray with respect to the apparatus main body.

An image processing apparatus includes an apparatus body, a feeding cassette, a pin member, a lever, an elastic member, and a guide mechanism. The feeding cassette is insertable into and ejectable from the apparatus body in one direction and includes an insertion position for insertion into the apparatus body and an ejection position for ejection from the apparatus body. The pin member is connected to the feeding cassette. The lever is rotatable around an axis in a first direction, and includes a pin engagement portion engaging with the pin member at a tip end in the axial direction. The elastic member includes a tip end connected between the rotation axis of the lever and the pin engagement portion of the lever, and adds a force for rotation in an insertion direction. The guide mechanism shortens a distance between the pin member and the rotation axis of the lever.

The present invention provides a sheet feeding apparatus capable of feeding sheets at a proper position without a regulating member being bent even if a cassette unit is closed in a state in which a large volume of sheets are stacked. A large-volume feeding deck includes a non-reference-side regulating plate, an external casing plate, and positioning members, which are movable relative to the cassette unit.

An image forming apparatus can prevent an apparatus main body from moving when a recording medium storing cassette is extracted from the apparatus main body. The image forming apparatus has an apparatus main body, a recording medium storing cassette, and a manual feed tray arranged swingably over the recording medium storing cassette. The recording medium storing cassette has a first side face a handle part provided in the first side face. The manual feed tray has a second side face arranged continuous with the first side face. In a part over the handle part, between the first side face and the second side face, a supporting portion in the apparatus main body is arranged.

An attachment is attachable to and detachable from a sheet stacking board. The attachment includes an end fence configured to restrict a position of a trailing end of a sheet in a conveying direction. The end fence includes a facing surface facing the trailing end of the sheet. The facing surface includes an inclined surface inclined with respect to a vertical direction of a stacking surface on which the sheet is stacked, such that a higher part of the facing surface is located more upstream in the sheet conveying direction.

A sheet tray configured to accommodate a sheet includes a first tray, a second tray directly connectable to the first tray, and a third tray directly connectable to the first tray and to the second tray in a state where the second tray is disengaged from the first tray, the third tray being made of metal. The sheet tray is configured to take a first state where the first tray is directly connected to the second tray and a second state where the third tray connects the first tray to the second tray. The sheet tray is configured to accommodate a sheet having a first size in the first state and a sheet having a second size longer than the sheet having the first size in the second state.

An image processing apparatus includes an apparatus body, a feeding cassette, a pin member, a lever, an elastic member, and a guide mechanism. The feeding cassette is insertable into and ejectable from the apparatus body in one direction and includes an insertion position for insertion into the apparatus body and an ejection position for ejection from the apparatus body. The pin member is connected to the feeding cassette. The lever is rotatable around an axis in a first direction, and includes a pin engagement portion engaging with the pin member at a tip end in the axial direction. The elastic member includes a tip end connected between the rotation axis of the lever and the pin engagement portion of the lever, and adds a force for rotation in an insertion direction. The guide mechanism shortens a distance between the pin member and the rotation axis of the lever.

A sheet storage apparatus storing a sheet to be fed in a sheet feeding direction includes a sheet storage portion, a first trailing edge regulation surface, a second trailing edge regulation surface, and a pair of side edge regulation members. The pair of side edge regulation members are opposite each other and disposed, in the sheet storage portion, downstream of the second trailing edge regulation surface in the sheet feeding direction. The pair of side edge regulation members are selectively detachably attached to a first position and a second position. The pair of side edge regulation members regulates positions of side edges of the sheet of a first size stored in the sheet storage portion in a width direction at the first position. The pair of side edge regulation members regulates positions of side edges of the sheet of a second size in the width direction at the second position.

A sheet feeding device includes a sheet accommodating portion mounted in a main assembly. With respect to a crossing direction perpendicularly crossing a pulling-out direction of the sheet accommodating portion from the main assembly as viewed in a direction of gravitation, the main assembly is provided with a positioning portion. A member-to-be-engaged is provided in one of the main assembly and the sheet accommodating portion. An engaging member is provided in the other of the main assembly and the sheet accommodating portion. The engaging member is elastically deformed when the sheet accommodating portion is pulled out in the pulling-out direction from a mounting position. The engaging member is provided swingably in the other one of the main assembly and the sheet accommodating portion so as to be capable of changing a position thereof with respect to the crossing direction.