A process cartridge includes a frame, a photosensitive drum supported by the frame, a developing roller supported by the frame, and a coupling operatively connected to the photosensitive drum. A helical gear is positioned at the side of the process cartridge, the helical gear being rotatable about an axis thereof. A stopper is positioned at the side of the process cartridge, with the stopper having a surface extending in an axial direction of the photosensitive drum and facing the axis of the photosensitive drum. As measured in an axial direction of the photosensitive drum, at least a part of exposed teeth of the helical gear is positioned farther an end of the photosensitive drum than a tip of the projection of the coupling is positioned from the end of the photosensitive drum.

An image forming apparatus, including: a photoconductor; a developing device; a developer storage; a supplier configured to supply developer; an optical sensor; and a controller configured to execute: a developing process of developing an electrostatic latent image on the photoconductor; a usage-amount obtaining process of obtaining a usage amount of the developer; a supplying process of supplying the developer to the developing device every time when the obtained usage amount becomes equal to or greater than a first threshold; and a detecting process of detecting, by the optical sensor, an amount of the developer in the developing device every time when the obtained usage amount becomes equal to or greater than a second threshold larger than the first threshold, and wherein the controller is configured to execute the detecting process in a period different from a period in which the developing process is being executed.

A process cartridge including a drum cartridge, a developing cartridge, and a waste toner container, is provided. The drum cartridge includes a photosensitive drum including a photosensitive layer and a rotation axis extending in an axial direction, a drum cleaner arranged to contact the photosensitive drum, a cleaner frame configured to accommodate the drum cleaner therein, and a waste toner conveyer tube connected with the cleaner frame. The developing cartridge is movable to be attached to and detached from the drum cartridge and includes a developer roller. The waste toner container is movable to be attached to and detached from the drum cartridge. When the developing cartridge and the waste toner container are attached to the drum cartridge, the waste toner container is connected with the waste toner conveyer tube and is located on an opposite side of the developing cartridge to the photosensitive drum.

A replaceable unit for an electrophotographic image forming device includes a housing having a reservoir for holding toner. An electrical connector is positioned on a first side of the housing. The electrical connector includes an electrical contact for contacting a corresponding electrical contact in the image forming device and a magnetic sensor electrically connected to the electrical contact. The electrical connector is movable between a first position and a second position. When the electrical connector moves from the first position to the second position, the electrical contact of the replaceable unit moves from a retracted position to an operative position. When the electrical connector moves from the first position to the second position, the magnetic sensor moves from a misaligned position to an aligned position with a point in a path of movement of a magnet for sensing a magnetic field of the magnet.

A first side frame is apart from a second side frame in a first direction. A photosensitive drum is rotatable about a drum axis extending in the first direction. The photosensitive drum is rotatably supported between the first side frame and the second side frame. A grip portion extends in the first direction. A first connector extends in a second direction perpendicular to the first direction. The first connector connects the first side frame and a first end portion of the grip portion. The second connector extends in the second direction. The second connector connects the second side frame and a second end portion of the grip portion. A scanner unit is configured to expose the photosensitive drum to light. The scanner unit is located between the photosensitive drum and the grip portion as viewed in a third direction which is perpendicular to the first and second directions.

A printer includes an image forming unit configured to form an image on a sheet by an electrophotographic method, and a recording unit configured to record an image on a sheet by an inkjet method. An image recording position of the recording unit is located above an image forming position of the image forming unit.

A process cartridge includes a frame, a photosensitive drum supported by the frame, and a developing roller supported by the frame. A coupling is operatively connected to the photosensitive drum, with the coupling being rotatable about an axis thereof, and with the coupling being positioned (i) at a first end of the photosensitive drum, (ii) coaxial with the photosensitive drum, and (iii) at a side of the process cartridge. A helical gear is positioned at the side of the process cartridge, the helical gear being rotatable about an axis thereof, the helical gear having a plurality of teeth, with at least some of the teeth being exposed teeth that are uncovered by the frame and exposed to outside of the process cartridge. As measured in an axial direction of the photosensitive drum, at least a part of the exposed teeth of the helical gear is positioned farther from the second end of the photosensitive drum than a tip of a projection of the coupling is positioned from the second end of the photosensitive drum.

An image forming apparatus comprises a spacing member provided on a rotation shaft of the charging roller, the spacing member configured to include an engaging portion that engages with the rotation member, and to be rotatable between a spaced position at which a spaced state in which the photosensitive drum and the charging roller are spaced apart is maintained, and a released position at which the spaced state is released and the photosensitive drum and the charging roller are caused to be in contact; and a cover portion provided on the rotation shaft of the charging roller, and configured to cover an end face of the spacing member so that a fitting portion of the charging roller and the spacing member is covered.

A replaceable unit for an electrophotographic image forming device includes a housing having a reservoir for holding toner. An electrical connector is positioned on a first side of the housing. The electrical connector includes an electrical contact for contacting a corresponding electrical contact in the image forming device and a magnetic sensor electrically connected to the electrical contact. The electrical connector is movable between a first position and a second position. When the electrical connector moves from the first position to the second position, the electrical contact of the replaceable unit moves from a retracted position to an operative position. When the electrical connector moves from the first position to the second position, the magnetic sensor moves from a misaligned position to an aligned position with a point in a path of movement of a magnet for sensing a magnetic field of the magnet.

A process cartridge includes a photosensitive drum and a gear portion having gear teeth configured to receive a driving force from outside of the process cartridge. The gear portion includes an exposed portion exposed to outside of the process cartridge. A shortest distance from an axis of the photosensitive drum to a tooth tip of the exposed portion of the gear portion measured along a direction perpendicular to the axis of the photosensitive drum is no less than 90% and no more than 110% of a radius of the photosensitive drum.