Process cartridge and space maintaining member
A process cartridge is detachably mountable to a main assembly of an electrophotographic image forming apparatus. The process cartridge includes a photosensitive member unit having a photosensitive drum, a developer carrying member for developing an electrostatic latent image formed on the photosensitive drum with a developer, and a toner accommodating unit having a developer accommodating portion accommodating the developer to be used for development of the electrostatic latent image. A movable frame supports the developer carrying member, and an urging member is provided for urging the movable frame in a direction in which the developer carrying member approaches the photosensitive drum. A space maintaining member, is also provided for maintaining a state in which a distance between the photosensitive drum and the developer carrying member is larger than that in an image formation.
1. A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, said process cartridge comprising:
a photosensitive member unit having a photosensitive drum;
a developer carrying member for developing an electrostatic latent image formed on said photosensitive drum with a developer;
a toner accommodating unit having a developer accommodating portion accommodating the developer to be used for development of said electrostatic latent image, said toner accommodating unit being fixed to said photosensitive member unit;
a movable frame that is movable relative to said toner accommodating unit and supports said developer carrying member;
an urging member for urging said movable frame in a direction in which said developer carrying member approaches said photosensitive drum; and
a space maintaining member, demountably provided between said photosensitive member unit and said movable frame in contact to said photosensitive member unit and said movable frame, for maintaining a state in which a distance between said photosensitive drum and said developer carrying member is larger than that in an image formation,
wherein said developer carrying member includes a gap maintaining member, provided at each of one and the other longitudinal ends of said developer carrying member in contact to said photosensitive drum, to provide a predetermined gap between said photosensitive drum and said developer carrying member, and
wherein said space maintaining member spaces said photosensitive drum and said gap maintaining member from each other.
2. A process cartridge according to claim 1 , further comprising a first side cover connecting said photosensitive member unit and said toner accommodating unit at longitudinal ends of said photosensitive member unit and said toner accommodating unit, and a second side cover connecting said photosensitive member unit and said toner accommodating unit with each other at the other longitudinal ends of said photosensitive member unit and said toner accommodating unit,
wherein said first side cover and said second side cover are provided with guides for guiding mounting and demounting of said space maintaining member.
3. A process cartridge according to claim 1 , further comprising an exposure opening for permitting passage of light to which said photosensitive drum is exposed.
4. A process cartridge according to claim 1 , further comprising a grip portion to be gripped by a user when said space maintaining member is dismounted from said process cartridge.
5. A process cartridge according to claim 1 , wherein said space maintaining member includes a recess for engagement with a projection provided in said movable frame to prevent said space maintaining member from disengaging from said process cartridge.
6. A process cartridge according to claim 1 , said movable frame supports a developing blade for regulating a layer thickness of the developer carried on said developer carrying member.