Example safety mechanisms for example printing apparatuses are provided. An example printing apparatus may include at least one linear guide disposed on a first surface of a back-spine section of a printer body and a top chassis portion coupled to the at least one linear guide. In some examples, the top chassis portion may include a laser safety casing. In some examples, the laser safety casing may comprise a laser module configured to emit a laser beam along a laser path and a safety cover that is moveable to a first cover position intersecting the laser path.

An image forming apparatus includes: a main body to which a detachable part is attachable, the main body having an opening; a cover that opens and closes the opening of the main body; and an insertion member that, when the detachable part is not attached to the main body, is in an inserted position where the insertion member is inserted between the main body and the cover and prevents closing of the cover, and when the detachable part is attached to the main body, is in a retreat position where the insertion member is not inserted between the main body and the cover and allows closing of the cover.

Example safety mechanisms for example printing apparatuses are provided. An example printing apparatus may include at least one linear guide disposed on a first surface of a back-spine section of a printer body and a top chassis portion coupled to the at least one linear guide. In some examples, the top chassis portion may include a laser safety casing. In some examples, the laser safety casing may comprise a laser module configured to emit a laser beam along a laser path and a safety cover that is moveable to a first cover position intersecting the laser path.

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 body; an image formation unit configured to form an image; a movable unit accommodated in the apparatus body and supporting the image formation unit; a guide part configured to guide the movable unit from an inside of the apparatus body in a pull-out direction; a first rotatable member provided to the apparatus body and configured to guide the movable unit in the pull-out direction; and a second rotatable member provided to the movable unit and configured to be engaged with the guide part at a position on an upstream side of the first rotatable member in the pull-out direction. In a state where the movable unit is guided by the first rotatable member with the movable unit being moved in the pull-out direction, the second rotatable member and the guide part are disengaged from each other.

An image forming apparatus includes an apparatus main body; a cover member that is provided rotatable in a rotation direction about a rotation axis with respect to the apparatus main body, having an opening part, a fuser that fuses a toner image formed on each medium of media wherein the fuser is attached to the apparatus main body by being inserted through the opening part and detached from the apparatus main body by being pulled out of the opening part; and a sub cover member that has an surface portion and is attached to the fuser, wherein in a state in which the fuser is attached to the image forming apparatus, the surface portion of the sub cover is arranged within the opening part, the sub cover member moves in the rotation direction in correspondence with the rotation of the cover member.

An image forming apparatus includes a door; an electric power source substrate for supplying electric power to an object detachably mounted through the door and provided with an electrical contact; an electroconductive member having an apparatus contact connected with the electric power source substrate; an element movable between a contacting position for contacting the apparatus contact and the electrical contact portion with each other and a spacing position for spacing them; a link connecting the door and the element to move the element to the contacting position with door closing and moving the element to the spacing position with door opening; and an operating portion movable with the element moving to the contacting position to connect an electroconductive path between the apparatus contact of the electroconductive member and the electric power source substrate, the operating portion being movable with the element moving to the spacing position to disconnect the path.

An image forming apparatus includes: a main body to which a detachable part is attachable, the main body having an opening; a cover that opens and closes the opening of the main body; and an insertion member that, when the detachable part is not attached to the main body, is in an inserted position where the insertion member is inserted between the main body and the cover and prevents closing of the cover, and when the detachable part is attached to the main body, is in a retreat position where the insertion member is not inserted between the main body and the cover and allows closing of the cover.

An image forming apparatus includes an apparatus cover, first and second exposure units, and an orientation setting mechanism. The apparatus cover opens or closes by pivoting about a rotation fulcrum with respect to an apparatus body. The first exposure unit is disposed at a first position, on an inner surface, spaced apart from the rotation fulcrum. The second exposure unit is disposed at a second position, on the inner surface, closer than the first position to the rotation fulcrum. The orientation setting mechanism sets an orientation of the first exposure unit to a first direction approaching the apparatus body in a closed state. The orientation setting mechanism sets it to a second direction further away than the first direction from the rotation fulcrum and sets the orientation of the second exposure unit to a third direction between the first and second directions when the opening angle is a first angle.

An image forming apparatus includes an apparatus main body to which a cartridge is detachably attached. The apparatus main body includes a frame having an opening portion through which the cartridge is attached to the apparatus main body; an opening and closing member supported by the frame rotatably between an open position in which the opening portion is exposed and a closed position in which the opening portion is covered with the opening and closing member and having a stacking surface on which a sheet is to be stacked; a discharging roller discharging the sheet in a discharging direction onto the stacking surface; and a regulating wall which is movably attached to the opening and closing member and extends from the stacking surface toward the discharging roller in a direction intersecting the discharging direction to regulate an upstream edge of the sheet in the discharging direction.