A unit moving apparatus includes a unit provided to a main body in such a manner so as to be attached to and pulled out from the main body, a main-body guide portion provided to the main body and configured to guide the unit while restricting rotation of the unit at a time of attaching and pulling out the unit, a pull-in unit configured to apply a pulling force to the unit to pull the unit into the main body, and a unit restriction portion configured to restrict rotation of the unit in such a manner that the units rotates within an angle smaller than an angle to which the main-body guide portion restricts the unit's rotation when a rotation moment is generated by the pulling force of the pull-in unit applied to the unit and a load applied to the unit in a direction opposite to an attachment direction.

A sheet feeding apparatus includes an apparatus body, a storage cassette having a cassette body and a regulation member regulating a position of a sheet, and a size detection portion detecting a size of the sheet. The size detection portion has a plurality of size detection levers which are swung around pivotal shaft, a plurality of non-contact type detection elements which are radially arranged around an imaginary axis on the apparatus body and are turned ON/OFF by the plurality of size detection levers in a case where the storage cassette is mounted, and a positioning unit. The positioning unit positions the storage cassette such that the pivotal shaft and an imaginary axis are matched in a case where the storage cassette is mounted on the apparatus body.

An image forming apparatus includes a conveyer roller exposed to an attachment space and a drive force transmission mechanism for transmitting a drive force from a drive source. The drive force transmission mechanism includes a plate driving gear exposed to the attachment space, a transmission gear train transmitting a drive force to the conveyer roller and to the plate driving gear, and a switching mechanism. The switching mechanism includes a driven gear transmitting the drive force to the transmission gear train, a pendulum gear revolvable between a coupled position in which the pendulum gear is engaged with the driven gear and an uncoupled position in which the pendulum gear is separated from the driven gear, and a transmission switch movable between a first position for holding the pendulum gear in the uncoupled position and a second position for allowing the pendulum gear to revolve between the coupled and uncoupled positions.

A sheet feeding apparatus includes a supporting portion and a feeding unit. The supporting portion supports a sheet and is capable of being drawn out from and being attached to an apparatus body. The feeding unit is provided in the apparatus body and includes a feeding portion, a conveyance portion, a separation unit, and a guide member. The feeding portion feeds the sheet supported by the supporting portion. The conveyance portion conveys the sheet. The separation unit forms a separation nip with the conveyance portion and is detachable from the feeding unit. The guide member includes a guide surface and a lower surface. The guide surface guides the sheet to the separation nip. The lower surface is provided below the guide surface and includes an exposing portion exposing at least a part of the separation unit.

A unit moving apparatus includes a unit provided to a main body in such a manner so as to be attached to and pulled out from the main body, a main-body guide portion provided to the main body and configured to guide the unit while restricting rotation of the unit at a time of attaching and pulling out the unit, a pull-in unit configured to apply a pulling force to the unit to pull the unit into the main body, and a unit restriction portion configured to restrict rotation of the unit in such a manner that the units rotates within an angle smaller than an angle to which the main-body guide portion restricts the unit's rotation when a rotation moment is generated by the pulling force of the pull-in unit applied to the unit and a load applied to the unit in a direction opposite to an attachment direction.

A sheet cassette includes a bottom portion, a pair of side walls, a lift plate and an auxiliary supporting portion. The pair of side walls stand from the bottom portion. The lift plate is arranged on the bottom portion, and a sheet to be fed in a conveying direction is placed on the upper surface of the lift plate. The lift plate includes a pair of fulcrum portions arranged on an upstream side in the conveying direction and is moved to a sheet feeding position for feeding the sheet by being moved upward from a bottom position with the fulcrum portions. The auxiliary supporting portion is arranged inwardly of the pair of fulcrum portions in a sheet width direction, is arranged between the lift plate arranged at the bottom position and the bottom portion and supports the lift plate.

A sheet feed cassette includes a bottom portion, a first cursor, a second cursor, and a fixing rack. The second cursor includes a regulating member, a lock member, and a biasing member. The regulating member abuts on the rear end edge of the sheet to regulate a position of the sheet in the mounting direction. The lock member includes a shaft portion extending in a direction intersecting with the mounting direction and an engaging protrusion located below the shaft portion. The biasing member is located and compressed between the regulating member and the lock member above the shaft portion. The gear teeth of the fixing rack and the engaging protrusion of the lock member engage so as to lock a position of the second cursor in the mounting direction. The regulating member and the lock member are separated above the shaft portion in the locked state.

The image forming apparatus which comprises a plurality of sheet holding units each configured to hold a sheet and a printing unit configured to print an image, receives a print setting for a first type test chart image to be printed on sheets conveyed from all of the plurality of sheet holding units and for a second type test chart image to be printed on a sheet conveyed from at least one sheet holding unit of the plurality of sheet holding units, and controls the printing unit on a basis of the print setting to convey sheets from each of the plurality of sheet holding units and print the first type test chart image and following thereafter convey a sheet from the at least one sheet holding unit from among the plurality of sheet holding units and print the second type test chart image.

An image forming apparatus includes: a manual feed tray that is provided at an opening in a sidewall of an apparatus body of the image forming apparatus and opens or closes the opening by an opening/closing operation; a guide portion that supports movement of the manual feed tray based on the opening/closing operation between a first position where the manual feed tray is upright along the sidewall to close the opening and a second position where the manual feed tray inclines toward outside of the apparatus body to open the opening, and guides the manual feed tray in the second position from the opening to within the apparatus body to retract the manual feed tray within the apparatus body; a sheet feed mechanism that feeds a sheet on the retracted manual feed tray; and an image forming device that forms an image on the sheet fed from the manual feed.

A sheet feeding device includes a sheet tray, a feeder to feed the uppermost sheet of a sheet bundle supported by a supporting surface of the sheet tray; a blowing portion provided on one side in a widthwise direction perpendicular to a feeding direction and to blow air through a blowing opening toward a side edge of the sheet bundle supported by the supporting surface; and a rotatable portion. The rotatable portion is rotatably provided opposite to the blowing opening in the widthwise direction and to the sheet tray, and is rotatable between a first position along the supporting surface and a second position rotated upward from the supporting surface by the air being blown by the blowing portion. When the rotatable portion is positioned in the second position, the rotatable portion includes a restricting portion to restrict the air from being blown to the supporting surface.