A process unit includes a drum frame supporting a photoconductor drum and a development frame supporting a development roller. The development cartridge is swingably supported by the drum frame at a coupling joint provided at a first side of the development frame and a support portion provided at a second side of the development frame. A center of rotation of the development roller is located in a position shifted from a line segment connecting a center of rotation of the coupling joint and a center of rotation of the photoconductor drum to an upstream side with respect to a direction of rotation of the coupling joint as viewed in an axial direction of the development roller, such that the development roller is pressed against the photoconductor drum by the action of the rotatory force received by the coupling joint.

There is provided an opening and closing apparatus, including: a main body; an openable body pivoting between a closed position and an open position; a connecting part connecting an end of the main body and an end of the openable body; a rack provided in one of the main body and the openable body; and an arm, wherein a part, of a pitch line of the rack, which makes contact with a pitch circle of the pinion in a state that the openable body is positioned in the vicinity of the closed position is an inclined line which is inclined to approach the other of the main body and the openable body having no rack, as the inclined line is farther away from the connecting part with the openable body being in the closed position.

An image forming apparatus includes a housing. The housing stores a toner bottle and has an insertion opening and a cover. The toner bottle is insertable to the insertion opening. The cover has an opening and openably closable the insertion opening. The toner bottle is visible from the opening of the cover at a closed position.

A sheet feeding device includes a feeding roller pair, a first guide, a door including a second guide and rotatable between a first direction and a second direction opposite to the first direction through first to third positions, a damping mechanism, and an engaging portion including an elastic member. A first resisting force is set so that moment acting around a shaft by a self-weight of the door is larger than the first resisting force of the damping mechanism when the door is positioned between the second position and the third position. A resultant force of the first resisting force of the damping mechanism and a second resisting force of the elastic portion is set so that the moment acting around the shaft by the self-weight of the door is larger than the resultant force when the door is positioned between the second position and the third position.

An image formation apparatus according to an embodiment may include: an exposure unit configured, when a cover member is opened from a closed position to an open position, to move from a first position to a second position with respect to the cover member; and a lock mechanism. When the cover member is in the open position, the exposure unit is movable between the second position and a third position in which the angle of the exposure unit relative to the cover member is different from that in the second position. The lock mechanism locks a position of the exposure unit when the exposure unit is in the third position. The lock mechanism releases the lock of the position of the exposure unit, when the cover member is moved from the open position to the closed position in the state where the exposure unit is in the third position.

An image forming apparatus includes an image forming part, a discharge tray, a reading part, a biasing support part, and a turning regulating part. The discharge tray is disposed above the image forming part. The reading part is turnably supported on an upper portion of the image forming part between a closed position and an opened position. The biasing support part biases the reading part from the closed position toward the opened position. The turning regulating part is engaged with the reading part disposed at the closed position and regulates a turning of the reading part, which is applied with a biasing force of the biasing support part, toward the opened position. When the medium is discharged from the image forming part to the discharge tray, the turning regulating part is disengaged with the reading part, and allows the turning of the reading part toward the opened position.

A housing structure includes a main housing, a first cover that opens and closes by rotating with respect to the main housing about a first axis along a horizontal direction, a second cover provided further inside than the first cover and that opens and closes with respect to the main housing together with the first cover by rotating around a second axis parallel to the first axis, a regulation section that regulates the second cover in a closed state in which the second cover is closed, and a restriction section that, when the first cover is closed, restricts the release of regulation by the regulation section.

A sheet conveyance apparatus includes an apparatus main body including a guide member that forms a conveyance path, and a door portion openable and closable and including a first pivot member pivoting around a first pivot shaft and a second pivot member coupled to the first pivot member with a second pivot shaft parallel to the first pivot shaft and pivoting around the second pivot shaft, wherein the second pivot member forms, with the guide member, a conveyance path through which the sheet passes when the door portion is closed, wherein, when the door portion is opened, the first pivot member pivots around the first pivot shaft, and the second pivot member, with the pivoting of the first pivot member, pivots around the second pivot shaft with respect to the first pivot shaft so that a leading end of the second pivot member approaches the first pivot shaft.

An image forming apparatus includes an image forming portion, a fixing portion configured to fix a toner image to a recording material, a housing which accommodates the image forming portion and the fixing portion and in which a conveyance path that the recording material passes through is formed, and a discharge portion configured to discharge the recording material. The housing includes a first exterior surface and a second exterior surface. The second exterior surface is provided with an opening portion through which an outside of the housing and an inside of the housing communicate with each other. The image forming apparatus further includes a filter disposed to cover the opening portion. In a width direction orthogonal to both the vertical direction and the discharge direction, a center of the conveyance path is positioned between one end and an other end of a range where the opening portion is provided.

A housing structure includes a main housing, a first cover configured to open and close by rotating with respect to the main housing about a first axis along a horizontal direction, a second cover provided further inside than the first cover and configured to open and close with respect to the main housing together with the first cover by rotating around a second axis parallel to the first axis, a regulation section configured to regulate the second cover in a closed state in which the second cover is closed, and a restriction section configured to, when the first cover is closed, restrict the release of regulation by the regulation section.