A sheet conveyance apparatus includes a first guide provided in an apparatus body, a second guide provided in an openable portion, a flag member supported by the apparatus body pivotally, a detection unit configured to detect pivoting of the flag member, and a jam release guide provided in the apparatus body. In a state where the openable portion is open, the flag member is protruded into a space that is created between the openable portion and the apparatus body by an opening operation of the openable portion. The jam release guide is disposed at a position not hampering conveyance of the sheet in a state where the openable portion is closed, and is disposed to come in contact, together with the flag member, with a jammed sheet to regulate a posture of the jammed sheet in a state where the openable portion is open.

An image formation apparatus according to an embodiment may include: an apparatus housing including a stacker formed on a periphery of the apparatus housing, wherein the stacker includes an opening; an image formation part provided in the apparatus housing and configured to form an image on a medium; and a fixation unit detachably attached in the apparatus housing and configured to fix the image formed by the image formation part on the medium, wherein in a state where the fixation unit is attached in the apparatus housing, a part of the fixation unit is exposed through the opening of the stacker to constitute a part of the stacker such that the opening of the stacker allows the fixation unit to be taken out from the apparatus housing therethrough.

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: a body housing; an access opening closure; a rotary member rotatable relative to the body housing; a first link member coupled to the rotary member; a second link member coupling the access opening closure to the first link member, having a first end pivotally movable relative to the access opening closure and a second end slidable along the first link member, and including a slit connecting the first end and the second end; a cutaway communicating with the slit near the second end and then turning around, and narrower than the slit; a pin mounted on the body housing and located within the slit; a boss projecting from the first end; and an elongated socket mounted on the access opening closure and receiving the boss slidably. A sliding resistance between the boss and the elongated socket is larger than between the pin and the slit.

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 apparatus body including an image bearing member configured to bear a toner image, a transfer unit including a transfer portion configured to transfer the toner image borne on the image bearing member onto a sheet, the transfer unit being pivotably supported with respect to the apparatus body, an opening/closing unit disposed at a position farther from the apparatus body than the transfer unit is, and openably and closably supported with respect to the apparatus body, and a positioning portion pivotably supported with respect to the apparatus body and configured to position the transfer unit with respect to the apparatus body. The positioning portion is entirely disposed further on an outer side in the apparatus body than a pivot center of the transfer unit in a horizontal direction.

A panel apparatus includes: a body having an interior space open to an outside of the panel apparatus via an opening; one of a protrusion and a recess in the interior space; an input panel having a first surface, a second surface behind the first surface, and an input part provided in the first surface; a support part provided in the body to support the input panel such that the input panel pivots relative to the body; an arm protruding from the second surface and configured to guide the input panel such that the input panel pivots relative to the body by being inserted into the interior space through the opening; and the other of the protrusion and the recess which is provided in a part of the arm inserted into the interior space. Pivoting of the input panel is regulated by engagement of the protrusion and the recess.

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 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 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.