초록 ▼

A developing apparatus in which a developer is prevented from attaching to a developer electrifying member. The developing apparatus has a developer carrying body, a regulating member, and a developer carrying member, wherein during a period when developing action is not conducted by the developer c

A developing apparatus in which a developer is prevented from attaching to a developer electrifying member. The developing apparatus has a developer carrying body, a regulating member, and a developer carrying member, wherein during a period when developing action is not conducted by the developer carrying body and residual developer is being cleaned, there is a first period during which a first electric field is formed in a direction in which the developer normally charged moves from the developer carrying body to the developer charging member and after the first period there is a second period during which a second electric field is formed in a direction in which the developer normally charged moves from the developer charging member to the developer carrying body.

대표청구항 ▼

A developing apparatus in which a developer is prevented from attaching to a developer electrifying member. The developing apparatus has a developer carrying body, a regulating member, and a developer carrying member, wherein during a period when developing action is not conducted by the developer c

A developing apparatus in which a developer is prevented from attaching to a developer electrifying member. The developing apparatus has a developer carrying body, a regulating member, and a developer carrying member, wherein during a period when developing action is not conducted by the developer carrying body and residual developer is being cleaned, there is a first period during which a first electric field is formed in a direction in which the developer normally charged moves from the developer carrying body to the developer charging member and after the first period there is a second period during which a second electric field is formed in a direction in which the developer normally charged moves from the developer charging member to the developer carrying body. dinal end of said developing frame. 6. A process cartridge according to claim 1, 2 or 3, wherein said developing frame is rotatably coupled with said drum frame at a position away from a center of rotation of the developing member at a longitudinal end of the developing member by a pin engaged with said developing frame and said drum frame. 7. A process cartridge according to claim 1, 2 or 3, further comprising a tension spring extending between said developing frame and said drum frame at a longitudinal end of the developing member, wherein said tension spring has one end which is connected to said developing frame and another end which is connected to said drum frame. 8. A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, said process cartridge comprising: an electrophotographic photosensitive drum; a developing member for developing an electrostatic latent image formed on said electrophotographic photosensitive drum; a drum frame for supporting said electrophotographic photosensitive drum; a developing frame for supporting said developing member, wherein said developing frame is provided at one longitudinal end with a projected portion projecting in a longitudinal direction of said developing member, and wherein said projected portion is engaged with a guide member, and said projected portion is movable along the guide member toward said drum frame; an elastic member urging said projected portion along the guide member toward said drum frame; a first end cover disposed at one longitudinal end of each of said drum frame and said developing frame, wherein the guide member is disposed inside said first end cover; and a second end cover disposed at the other longitudinal end of each of said drum frame and said developing frame, wherein said projected portion is substantially coaxial with said developing member. 9. A process cartridge according to claim 8, wherein the guide member has a recess in which a free end of said projected portion is disposed and in which said elastic member in the form of a coil spring is provided, and said projected portion is urged toward said drum frame by the elastic force of the coil spring, by which said developing member in the form of a developing roller is urged toward said electrophotographic photosensitive drum with spacer rollers therebetween, wherein said spacer roller is disposed at each of one and the other end portions of the developing roller. 10. A process cartridge according to claim 9, wherein said coil spring has an urging member mounted to a free end thereof, and wherein said urging member contacts a flat portion of said projected portion to urge said projected portion by an elastic force of said coil spring, wherein said urging member is slidably engaged with a groove, by which said coil spring is mounted for movement into the recess. 11. A process cartridge according to claim 9 or 10, wherein said projected portion is substantially coaxial with said developing member. 12. A process cartridge according to claim 8, 9 or 10, wherein said developing frame is rotatably coupled with said drum frame at a position away from a center of rotation of said developing member at a longitudinal end of said developing member by a pin engaged with said developing frame and said drum frame. 13. A process cartridge according to claim 8, 9 or 10, further comprising a tension spring extending between said developing frame and said drum frame at a longitudinal end of said developing member, wherein said tension spring has one end which is connected to said developing frame and another end which is connected to said drum frame. 14. A process cartridge according to claim 8, 9 or 10, wherein said developing member is supported on said developing frame for movement in a direction crossing with the longitudinal direction thereof. 15. A process cartridge detachably mountable to a main assembly of an electrophotographic image forming appar