A locking mechanism includes a hook, an engaged portion, and a biasing member, and locks a movable unit supported on a unit main body to the unit main body. The hook has a supporting portion pivotably supported on the unit main body and an engaging portion protruding from the supporting portion. The engaged portion is formed on the movable unit and is engageable with the engaging portion. A biasing member biases the hook in such a direction as to let the engaging and engaged portions engage. The hook has a first face facing the engaged portion at the tip end of the engaging portion and a second face extending from the first face toward the supporting portion and inclined relative to the first face in such a direction as to recede from the pivot. With the engaging and engaged portion in engagement, the engaged portion touches only the second face.

There is provided with a sheet feeding apparatus. A biasing unit generates a biasing force of biasing a storage unit in an insertion direction. A repulsive unit generates a repulsive force of biasing the storage unit in a direction opposite to the insertion direction. A fixing unit fixes the storage unit in a fixing position. The biasing unit starts generating the biasing force in a repulsion start position where the repulsive unit starts generating the repulsive force, or on an upstream side of the repulsion start position, in the insertion direction, and stops generating the biasing force before the storage unit reaches the fixing position. A biasing Zone in which the biasing unit generates the biasing force and a repulsive zone in which the repulsive unit generates the repulsive force partially overlap each other.

An image forming apparatus includes an apparatus body that forms an image on a recording material; a drawn-out unit that is provided so as to be drawable from the apparatus body and has a mount region on which the recording material is mounted; and a guide unit that is provided on the drawn-out unit and guides the recording material to a position where the recording material is to be mounted on the mount region. The guide unit has a guide surface that guides an end of the recording material, a hook part that is hooked onto the drawn-out unit and determines a position relative to the drawn-out unit, and a release part that releases the hook part from the drawn-out unit by being operated by a user from a guide surface side.

A cassette drawing-in device in an embodiment includes a lever, a guide section, and an urging member. The lever includes an engaging groove opened on a first side in a first direction. The engaging groove includes an entrance for a cassette pin at an end portion in a longitudinal direction. The cassette pin projects to a second side in the first direction from a cassette. The cassette is capable of moving in a second direction orthogonal to the first direction. The lever rotates around the rotation axis to thereby draw in, in the second direction, the cassette pin engaging in the engaging groove. The guide section is formed in the entrance of the engaging groove and guides the cassette pin to the first side in the first direction. The urging member urges the lever to the first side in the first direction.

An image processing apparatus in an embodiment includes an apparatus main body, a paper feeding cassette, a drawing-in mechanism, and a restricting member. The paper feeding cassette is inserted into the apparatus main body to be capable of being drawn out in a first orientation along a first direction. The drawing-in mechanism draws the paper feeding cassette into the apparatus main body up to a drawing-in completion position along a second orientation. The restricting member restricts the paper feeding cassette present in the drawing-in completion position from being displaced in the second orientation. If the paper feeding cassette is not connected to the drawing-in mechanism even if the paper feeding cassette is pushed in up to the drawing-in completion position, the restricting member is displaced from the predetermined position to allow the paper feeding cassette to be displaced in the second orientation with respect to the apparatus main body.

A medium discharging device includes a discharging unit which discharges a medium; and a medium receiving tray which receives the medium discharged by the discharging unit, and is switched between an extended state and an accommodated state, in which the medium receiving tray is provided with a base tray, a main extending unit that is accommodated or extended, and at least one sub-extending unit that is accommodated or extended, and in which the base tray forms an accommodating space for accommodating at least the one sub-extending unit, and is provided with a first protrusion portion protruding toward the accommodating space.

The image forming apparatus may include a main body and a cassette to enter or exit the main body along a first direction to be mounted in or released from the main body, respectively. The cassette may include a supporter extendable in a second direction perpendicular to the first direction to protrude from an exterior of the main body. The main body may include a lever which is movable in the first direction between a supporting position at which the lever supports the main body and a release position at which to allow the cassette to enter or exit the main body along the first direction.

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.

A sheet storage device for storing sheets includes a supporting unit, a regulation unit, and a moving unit. The supporting unit supports stored sheets. The regulation unit is movably arranged on the supporting unit, and regulates a position of an edge portion of a sheet. The moving unit moves the regulation unit. The moving unit includes moving members to move in a direction parallel to a moving direction of the regulation unit. The moving members are moved by rotation of a rotation member in a case where the rotation member is in contact with the moving members. In a case where a fixing member attached to the sheet storage device in place of the rotation member, movement of the moving members is regulated by placing the moving members into contact with the fixing member.

An image forming apparatus includes a first casing, a pivotable second casing, a pivotable document cover, and a lock mechanism including a movable hook and a fixed hook. The second casing has a document support surface. When the second casing is at a first position in which the second casing covers an upper surface of the first casing, and the document cover is at a fourth position in which the document cover reveals the document support surface, the movable hook is engaged with the fixed hook. When the second casing is at the first position, and the document cover is at a third position in which the document cover covers the document support surface, the movable hook is disengaged from the fixed hook.