An image forming apparatus includes a supporting member configured to support a developing unit and be movable between a first position and a second position, an opening/closing member configured to open and close an opening through which the developing unit passes when the developing unit is attached to or detached from the supporting member, and a restriction member configured to restrict a movement of the supporting member from a third position different from the first and second positions, wherein in case where the opening/closing member is opened when the supporting member is at the first position, the restriction member presses the supporting member to move to the third position, and in case where the opening/closing member is opened when the supporting member is at the second position, the restriction member presses the supporting member to move to the third position.

An image forming apparatus includes an apparatus body and a moveable unit. The apparatus body includes an image forming device and a restriction portion. The moveable unit includes an image reading device and is detachably attached to the apparatus body. The moveable unit is opened and closed with respect to the apparatus body by rotation about a rotation shaft when the moveable unit is attached to the apparatus body. The moveable unit is attached to and detached from the apparatus body by moving in an axial direction of the rotation shaft. The moveable unit further includes a restricted portion that engages with the restriction portion that restricts a movement of the moveable unit in the axial direction. The restriction portion or the restricted portion further includes a deformation portion having elasticity. The deformation portion is deformed so that the moveable unit is attached to and detached from the apparatus body.

A cover member includes: a fittable recess that opens to one side of the cover member in a direction orthogonal to an axis of a shaft member, receives a torsion coil spring from the one side, and fits on an outer periphery of the torsion coil spring; and an anchoring counter element to which one end of the torsion coil spring is anchored. The torsion coil spring is engaged with a hook member while being fitted in the fittable recess, thus biasing the hook member toward movement about the axis of the shaft member to a locking position and supporting both ends of the shaft member rotatably around an internal surface of the coil to function as a bearing member.

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.

An image forming apparatus includes: an open/close member supported so as to be movable between an open position at which an inside of an apparatus body is exposed and a closed position at which the apparatus body is closed; an engaged portion provided on the apparatus body; an engaging member having an engaging portion that is engageable with the engaged portion and a lever portion that contacts the engaged portion to guide the engaging portion to the engaged portion when the open/close member is moved from the open position to the closed position, the engaging member being provided on the open/close member and being rotatable forward and in reverse; and an urging member that urges the engaging member. The urging direction of the urging member is changeable between fixing and releasing directions in which the engaging member is drawn into and moved away from the engaged portion, respectively.

An image forming apparatus includes an object disposed in an apparatus body so as to be capable of being taken out through an opening; an opening-closing portion that is rotatable and that covers the opening and rotates upward to open the opening; and an operating portion that is rotatable and disposed in front of the opening-closing portion. The operating portion is disposed at a position on a rotation trajectory along which the opening-closing portion rotates upward and on a path along which the object is taken out of the apparatus body. The operating portion rotates forward so as to be retracted from the rotation trajectory and the path along which the object is taken out and so that the path along which the object is taken out is formed between the operating portion and the opening-closing portion in the open state.

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.

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.

One or more embodiments may be an image formation apparatus that may include: a roller attached to an apparatus main body to convey a medium; and a pivot member pivotable between a closed position and an open position relative to the apparatus main body. The pivot member includes: a cleaning member that is in contact with the roller to thereby remove adherents from the roller in a state where the pivot member is in the closed position; a first storage section provided to accommodate the adherents removed by the cleaning member; and a second storage section provided communicating with the first storage section through an opening. The pivot member is configured such that the removed adherents that is accommodated in the first storage section moves from the first storage section to the second storage section when the pivot member pivots from the closed position to the open position.

An image forming apparatus, having an image forming unit, a document reader unit pivotable on the image forming unit through a hinge, a retainer to retain the document reader unit in the open position, is provided. The retainer includes a first link member rotatably coupled with the image forming unit and the document reader unit through a first coupling section and a second coupling section; a second link member rotatably coupled with the image forming unit and the document reader unit through a third coupling section and a fourth coupling section; and a tension coil spring. The first link member includes a first contacting part that faces and contacts the second link member along a tensile direction of the tension coil spring when the document reader unit is in a closed position.