Abstract: A developing cartridge may include: a casing configured to accommodate developer therein, the casing extending in the first direction; a coupling rotatable about a first axis extending in the first direction, the coupling being positioned at one side of the casing in the first direction; a detection gear rotatable about a second axis extending in the first direction, the detection gear being positioned at another side of the casing in the first direction; and a storage medium including an electric contact surface, the electric contact surface being positioned at the one side of the casing in the first direction.

Abstract: In a cartridge, a developing roller is configured to rotate around a first rotational axis extending in a predetermined direction and to carry developer thereon, the developing roller having a first end and a second end apart from each other in the predetermined direction, a from-first-to-second direction being defined along the predetermined direction as being directed from the first end to the second end. A developing electrode is formed of a conductive material and is configured to be electrically connected to the developing roller, the developing electrode including a main part and a protruding portion protruding from the main part in the from-first-to-second direction. A detection body is formed of an insulating material and is rotatably supported by the protruding portion, the detection body including a first opening that exposes part of the protruding portion and a covering portion covering part of the protruding portion.

Abstract: In a state where a first drum cartridge is mounted on a drawer unit located at an external position, a first exposure head moves from a first position through a second position to a third position. The first position is a position where the first exposure head is adjacent to a first photosensitive drum and a first drum cartridge is prevented from being removed from the drawer unit. The second position is a position where the first exposure head is farther away from the first photosensitive drum than at the first position and the first exposure head is slidably moved from the first position. The third position is a position where the first exposure head is farther away from the first photosensitive drum than at the second position, the first exposure head is rotatably moved from the second position, and the first drum cartridge is allowed to be removed.

Abstract: In a developing cartridge, a first supporting member is attached to a housing and has a first developing supporting portion and a driving-force-receiving-member supporting portion. The first developing supporting portion is configured to rotatably support a first part of a rotational shaft and the driving-force-receiving-member supporting portion is configured to rotatably support a driving-force-receiving member. The second supporting member is attached to the housing and has a second developing supporting portion and a detection-rotational-body supporting portion. The second developing supporting portion is configured to rotatably support a second part of the rotational shaft and the detection-rotational-body supporting portion is configured to rotatably support a detection rotational body.

Abstract: In a cartridge, a developing roller is configured to rotate around a first rotational axis extending in a predetermined direction and to carry developer thereon, the developing roller having a first end and a second end apart from each other in the predetermined direction, a from-first-to-second direction being defined along the predetermined direction as being directed from the first end to the second end. A developing electrode is formed of a conductive material and is configured to be electrically connected to the developing roller, the developing electrode including a main part and a protruding portion protruding from the main part in the from-first-to-second direction. A detection body is formed of an insulating material and is rotatably supported by the protruding portion, the detection body including a first opening that exposes part of the protruding portion and a covering portion covering part of the protruding portion.

Abstract: In a cartridge, a housing has a developer accommodating portion and includes a first side wall and a second side wall. A coupling member is disposed at a position opposite to the developer accommodating portion with respect to the first side wall. A detection body is disposed at a position opposite to the developer accommodating portion with respect to the second side wall. A first driving force transmission member is positioned at the same side with the coupling member with respect to the first side wall, and transmits driving force from the coupling member to a rotating member. A second driving force transmission member is positioned at the same side with the detection body with respect to the second side wall, and transmits driving force from the rotating member to the detection body.

Abstract: A process cartridge including: a photosensitive member cartridge including a photosensitive member; and a developing cartridge including a developer carrier. The developing cartridge further includes: an inputting portion; a first cover; and a second cover. The first cover has a first engagement portion configured to move the developer carrier away from the photosensitive member. The first engagement portion is positioned between an axis of the developer carrier extending in an axial direction and an axis of the inputting portion extending in the axial direction, when projected in the axial direction. The second cover has a second engagement portion configured to move the developer carrier away from the photosensitive member. The second engagement portion is positioned between the axis of the developer carrier and the axis of the inputting portion, when projected in the axial direction.

Abstract: In a cartridge, a developing roller is configured to rotate around a first axis extending in an extending direction. The cartridge further includes a cylinder extending in the extending direction and configured to receive electric power, a first portion, which is one portion of a circumferential surface of the cylinder, and a second portion, which is another portion of the circumferential surface of the cylinder. The cartridge also includes a gear rotatable about a second axis extending in the extending direction, a first covering portion covering the first portion and being rotatable with the gear, and a gear cover covering at least a portion of the gear and having an opening through which the second portion is exposed.

Abstract: A drawer unit moves in a moving direction between an internal position inside a main housing and an external position outside the main housing. The drawer unit includes: a drawer frame configured such that a drum cartridge and a developing cartridge are mounted thereon; and an exposure head that exposes a photosensitive drum. In a state where the drawer frame is located at the external position and where the drum cartridge is mounted on the drawer frame, the drum cartridge rotatably moves between: a first position at which the exposure head is located at a particular position relative to the photosensitive drum and the drum cartridge is prevented from being removed from the drawer frame; and a second position at which the exposure head is deviated from the particular position relative to the photosensitive drum and the drum cartridge is allowed to be removed from the drawer frame.

Abstract: An image forming apparatus includes a drawer having an exposure head. The drawer can include first and second guides to receive a drum cartridge and a developer cartridge, respectively. The first guide extends from a first side of the drawer into the drawer and toward the exposure head from a first side of the exposure head, and the second guide extends from the first side of the drawer into the drawer and toward the exposure head from a second side of the exposure head opposite the first side. In some instances, the drum cartridge is positioned at least partially below the developer cartridge but is removable from the drawer without removing the developer cartridge.

Abstract: An image forming apparatus comprises a photosensitive drum, a developing cartridge and a frame. The developing cartridge comprises a casing, a developing roller, a storage medium having an electrical contact surface and a holder holding the electrical contact surface on the first external surface. The frame has an electrical contact. The electrical contact is contact with the electrical contact surface of the developing cartridge in a state that the developing cartridge is attached to the frame. The casing is movable relative to the holder in a separating direction in which the developing roller separates from the photosensitive drum in a state that the electrical contact surface is in contact with the electrical contact.

Abstract: A developing cartridge may include: a casing configured to accommodate developer therein, the casing extending in the first direction; a coupling rotatable about a first axis extending in the first direction, the coupling being positioned at one side of the casing in the first direction; a detection gear rotatable about a second axis extending in the first direction, the detection gear being positioned at another side of the casing in the first direction; and a storage medium including an electric contact surface, the electric contact surface being positioned at the one side of the casing in the first direction.

Abstract: An image forming apparatus includes: a frame; a plate including first and second electrical contact portions; and a developing cartridge detachably mountable to the frame. At least a portion of the first electrical contact portion is movable relative to the plate and separated farther from the plate than the second electrical contact portion The developing cartridge includes: a storage medium and a pressing portion. The storage medium includes first and second electrical contact surfaces. The pressing portion is configured to press the first electrical contact surface toward the first electrical contact portion to bring the first electrical contact surface into contact with the first electrical contact portion and to press the second electrical contact surface toward the second electrical contact portion to bring the second electrical contact surface into contact with the second electrical contact portion in a state where the developing cartridge is mounted to the frame.

Abstract: A developing cartridge includes: a casing; a developing roller; a storage medium; a first holder; a second holder; and a coupling. The developing roller is positioned at one end portion of the casing in a first direction. The first holder has an outer surface at which an electrical contact surface of the storage medium is held. The second holder is positioned away from the first holder in a direction crossing the electrical contact surface. The first holder and the second holder are movable relative to the casing and the coupling between a first position and a second position in the first direction. The second position is closer to the developing roller than the first position. A portion of the coupling is positioned between the first holder and the second holder in a case where the first holder and the second holder are positioned at the second position.

Abstract: A developing cartridge may include: a casing to accommodate developer; a storage medium including an electric contact surface; an elastic member extending in a first direction crossing the electric contact surface, and configured to be compressed or stretched in the first direction between a first state and a second state; and a holder including an outer surface positioned toward a side of the holder in the first direction, the electric contact surface positioned at the outer surface, and movable between first and second positions in the first direction relative to the casing. A length of the elastic member in the first direction is greater in the first state than in the second state. The electric contact surface is in the first position when the elastic member is in the first state, and the electric contact surface is in the second position when the elastic member is in the second state.

Abstract: A drum unit includes: a frame; a first photosensitive drum; a second photosensitive drum; a charger; and a storage medium. The frame includes: a first frame plate; a second frame plate spaced apart from the first frame plate in a first direction; a third frame plate connecting one end of the first frame plate to one end of the second frame plate; and a fourth frame plate connecting another end of the first frame plate to another end of the second frame plate. The first photosensitive drum and the second photosensitive drum are rotatably supported by the frame. The second photosensitive drum is spaced apart from the first photosensitive drum and positioned closer to the third frame plate than the first photosensitive drum to the third frame plate in a second direction. The storage medium has an electrical contact surface positioned at an outer surface of the third frame plate.

Abstract: A cartridge configured to accommodate a developing agent may include a detection gear, a first protrusion, and a memory. The detection gear may be rotatable about a first axis extending in a predetermined direction. The first protrusion may be movable with rotation of the detection gear. The memory may include a first storage region storing a first yield information representing at least one of amount of the developing agent in the cartridge and the number of printable sheets by the developing agent in the cartridge, wherein at least one of the amount of the developing agent and the number of sheets by the developing agent in the cartridge may be confirmable based on the first yield information and the first protrusion.

Abstract: A developing cartridge may include: a casing configured to accommodate developer therein, the casing extending in the first direction; a coupling rotatable about a first axis extending in the first direction, the coupling being positioned at one side of the casing in the first direction; a detection gear rotatable about a second axis extending in the first direction, the detection gear being positioned at another side of the casing in the first direction; and a storage medium including an electric contact surface, the electric contact surface being positioned at the one side of the casing in the first direction.

Abstract: A developing cartridge includes a housing, a developing roller, a lever, and a storage medium. The housing may be configured to store a developing agent. The developing roller may be rotatable about a first axis extending in a first direction. The storage medium may be swingable together with the lever in a swing direction. The storage medium may have an electric contact surface. The electric contact surface may be swingable between a retreat position and an advance position. The electric contact surface may be positioned at the retreat position when the lever is positioned at a first position. The electric contact surface may be positioned at the advance position in a case where the lever is positioned at a second position. The housing may be movable in the second direction relative to the lever and the electric contact surface in a case where the electric contact surface is positioned at the advance position.

Abstract: A developing cartridge may include: a casing to accommodate developer; a storage medium including an electric contact surface; an elastic member extending in a first direction crossing the electric contact surface, and configured to be compressed or stretched in the first direction between a first state and a second state; and a holder including an outer surface positioned toward a side of the holder in the first direction, the electric contact surface positioned at the outer surface, and movable between first and second positions in the first direction relative to the casing. A length of the elastic member in the first direction is greater in the first state than in the second state. The electric contact surface is in the first position when the elastic member is in the first state, and the electric contact surface is in the second position when the elastic member is in the second state.