A process cartridge mountable on an image forming apparatus includes a photoconductive drum, a developing unit including a developing roller and a toner storage unit. The toner storage includes a first toner storage chamber, a second toner storage chamber located above the first toner storage chamber, a first toner conveying member located in the first toner storage chamber and configured to convey the toner in the first toner storage chamber upward toward the second toner storage chamber in an area wider than the toner discharge outlet in the first direction, and a second toner conveying member located in the second toner storage chamber and configured to convey, in the first direction, the toner in the second toner storage chamber toward the toner discharge outlet.

An image forming apparatus includes: a rotatable cylinder; a rotational member rotatable integrally with the cylinder; an annular circumferential rotation member that is wound around the rotational member, and configured to circumferentially rotate along with rotation of the rotational member; a holding member that is mounted on the circumferential rotation member, and configured to rotate along with the circumferential rotation member and hold a front end of a recording medium; a recess provided in an outer circumference of the cylinder, and configured to store the holding member; a cleaning member that is to come into contact with an outer circumferential surface of the cylinder to clean the outer circumferential surface; and a controller that, in a pause period of image formation, controls rotation of the cylinder so that the cleaning member is located at a position of the recess in a rotation direction of the cylinder.

A roller cleaning mechanism includes a cleaning member making contact with a conveying roller, a holder holding the cleaning member, a housing for the holder, and an urging member. The holder is supported on the housing swingably about a swing shaft parallel to the axial direction of a driving roller. The urging member urges the holder oppositely to the rotation direction of the conveying roller. When the conveying roller rotates, its rotative driving force keeps the holder at a cleaning position where a cleaning face of the cleaning member makes contact with the outer circumferential face of the conveying roller. When the conveying roller is halted, the urging force of the urging member keeps the holder at a retracted position where a part of the cleaning member different from the cleaning face makes contact with the outer circumferential face of the conveying roller.

A process cartridge mountable on an image forming apparatus includes a photoconductive drum, a developing unit including a developing roller and a toner storage unit. The toner storage includes a first toner storage chamber, a second toner storage chamber located above the first toner storage chamber, a first toner conveying member located in the first toner storage chamber and configured to convey the toner in the first toner storage chamber upward toward the second toner storage chamber in an area wider than the toner discharge outlet in the first direction, and a second toner conveying member located in the second toner storage chamber and configured to convey, in the first direction, the toner in the second toner storage chamber toward the toner discharge outlet.

A conventional process cartridge is developed.

A rotatable developing roller, a developing frame for rotatably supporting the developing roller, toner including toner particles and an external additive, a toner accommodating portion for accommodating the toner, a supplying roller for supplying the toner to a surface of the developing roller in contact with the surface of the developing roller, a regulating blade for regulating a layer thickness of the toner carried on the surface of the developing roller in contact with the surface of the developing roller, and an electrical contact electrically connected to the supplying roller and the regulating blade and capable of receiving electric power from an outside are provided, wherein the toner includes hydrotalcite particles as the external additive, and in line analysis in STEM-EDS mapping analysis of the toner, fluorine exits inside the hydrotalcite particles.

The present disclosure relates to a compound having one or more polymerizable functional groups.