| 摘要 |
A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, the process cartridge includes a cartridge frame; an electrophotographic photosensitve drum; a charger for charging the drum; a developing member for developing an latent image on the drum; a developer accommodating portion to be used the developing member; an engaging member for being supported by a receiving portion of a movable member provided in the main assembly when the engaging member is in the main assembly, wherein the engaging member is provided on-a portion of the cartrige frame which takes an upper position when the cartridge is inserted into the main assembly in a longitudinal direction thereof, at a downstream end positionin a direction of insertion of the cartridge into the main assembly; a first guide provided on an upper portion of the frame, at such a position as takes a downstream position, wherein the first guide is guided by a fixed guide provided in the main assembly; a second guide provided on a lower portion of the frame at such a downstream position, wherein the second guide is guided by a first guide recess provided in the main assembly; a third guiding portion provided on a lower portion the frame at such an upstream position, wherein the third guide is guided by a second guide recess; a driving force receiving member provided at a downstream end portion, wherein the driving force receiving member receives a driving force from a driving force transmitting member provided in the main assembly; and a positioning portion projected from the frame toward an upstream side in the inserting direction, wherein the positioning portion is disposed coaxially with the drum, and wherein when the engaging member supported by the receiving portion is released to permit the cartridge to lower to the mount position, the positioning portion is supported by a positioning recess provided in the main assembly.
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