A sheet supporting apparatus includes first and second units. The first unit includes a first housing, first and second lock portions, a first shaft configured to be supported rotatably with respect to the first housing and to turnably support the first lock portion, and a second shaft configured to be supported rotatably with respect to the first housing and to turnably support the second lock portion. The second unit includes a second housing and first and second engagement portions provided in the second housing and configured to engage respectively with the first and second lock portions. The first and second shafts are disposed such that extension lines of rotational axes of the first and second shafts cross with each other in a plan view.

A sheet processing apparatus has a main body with an insertion slot for a sheet cassette. The sheet cassette has a moveable pin member. A housing in the main body includes a lever partially rotatable about a first axis. The lever has a pin engagement portion at an end of the lever that rotates about a second axis and has an engagement groove into which the pin member can be inserted from a first pin engagement position and a second pin engagement position when the lever has rotated about the first axis. An elastic member applies a force to the lever to rotate the lever toward the insertion direction of the cassette. The housing includes a chassis having a guide groove extending along the insertion direction. The guide groove includes an inclining portion that is inclined with respect to the insertion direction.

A sheet feeding device includes a stacking tray, a feeding portion, a first restricting member which includes a first restricting surface and a first supporting portion, a second restricting member which includes a second restricting surface and a second supporting portion, and an interrelating portion. In a state in which the first restricting surface and the second restricting surface are brought closest to each other, a part of the first restricting portion is positioned on a second restricting surface side with respect to a center line of the stacking tray, and a part of the second restricting portion is positioned on a first restricting surface side with respect to the center line.

An image forming apparatus includes an image forming unit, an apparatus main body, a conveyance unit, an opening/closing member, a discharge unit, and a stack tray. The conveyance unit conveys a sheet to the image forming unit. The opening/closing member opens and closes relative to the apparatus main body, and, where the opening/closing member is in an open state relative to the apparatus main body, allow making access to the conveyance unit. The discharge unit discharges the sheet on which the image is formed. The stack tray is turned between a first position for stacking sheets on the stack face, and a second position with an angle formed between an underside opposite to the stack face and a horizontal plane that is larger than an angle of the first position, and includes an engagement portion to engage with the apparatus main body in the second position.

An image forming apparatus includes a sheet feed cassette. The sheet feed cassette has a cylinder lock having a cylinder, and a turning unit coupled to the cylinder to be rotatable integrally with the cylinder. A switch switching part of the turning unit is configured to switch a power switch such that the power switch is in an ON state when an inner cylinder of the cylinder lock is at an unlocked position, and the power switch is in an OFF state when the inner cylinder is at a locked position. A cassette locking part of the turning unit is configured to place a sheet feed cassette of a standard sheet feeder in an unlocked state when the inner cylinder of the cylinder lock is at the unlocked position and place the sheet feed cassette in a locked state when the inner cylinder is at the locked position.

To enable placement of a regulating member which regulates a position of an end of a paper sheet at a desired position, and stable sheet feeding. A fixing member for standard size is guided to engage with a fixing hole for standard size and, in a state where the fixing member for standard size positions a trailing end regulator, a fixing member for non-standard size does not engage with a rack gear.

There is provided a sheet storage device including a regulation unit that includes a first contact portion configured to contact a stacking unit, and a second contact portion configured to contact a facing member. The first contact portion contacts the stacking unit in a state of being urged toward the stacking unit. The second contact portion contacts the facing member in a state of being urged toward the facing member.

According to one embodiment, a paper feed device includes a cassette, a main body, an actuator, a first elastic member, and a guide member. The actuator reciprocates between first and second directions in the second direction intersecting the first direction. The first elastic member urges the actuator. The guide member includes a base end portion, a front end portion, and a guide unit. The guide unit includes an apex portion overhanging in an opposite direction to the second direction. The base end portion is located at a third position in the second direction. The front end portion is movable between the third and a fourth position separated more than at the first position in the second direction. The guide unit is provided so that the apex portion can be disposed at the same position as an end of the actuator in the second direction at the second position.

An image forming apparatus includes a side regulating plate provided in a sheet feeding cassette and a regulating surface to regulate an end position of a sheet stored in the sheet feeding cassette. A first arm connected with a first connector of the side regulating plate and a second arm connected with a second connector of the side regulating plate pivot on an axis extending in the gravity direction, wherein the second connector is different from the first connector in terms of a feeding direction. A first fixing part fixes the first arm to the sheet feeding cassette, and a second fixing part fixes the second arm to the sheet feeding cassette, wherein the first arm intersects with the second arm when viewed in the gravity direction when the side regulating plate is located in at least a part of a movable range of the side regulating plate.

To enable placement of a regulating member which regulates a position of an end of a paper sheet at a desired position, and stable sheet feeding. A fixing member for standard size is guided to engage with a fixing hole for standard size and, in a state where the fixing member for standard size positions a trailing end regulator, a fixing member for non-standard size does not engage with a rack gear.