Developer feeding member, developing apparatus, process cartridge and developer feeding member mounting method

1. A developer feeding member for use with an electrophotographic image forming apparatus to feed a developer accommodated in a developer accommodating portion, comprising:

a shaft configured and positioned to receive a driving force to rotate when said shaft is mounted in the developer accommodating portion, said shaft having a slit;

a flexible sheet configured and positioned to feed the developer accommodated in the developer accommodating portion when said flexible sheet is mounted in the developer accommodating portion; and

a mounting member disposed in said slit and configured and positioned to mount said flexible sheet on said shaft, wherein said slit is provided between a first surface and a second surface opposed to said first surface, wherein said mounting member is projected from said first surface toward said second surface,

wherein a distance from the first surface to the second surface is larger than a distance from the first surface to an apex of said mounting member.

2. A developer feeding member according to claim 1 , wherein the slit is provided with a retaining portion configured and positioned to prevent disengagement of said flexible sheet from said shaft, said retaining portion being projected from said second surface toward said first surface, wherein a distance from the second surface to the first surface is larger than a distance from the second surface to an apex of said retaining portion.

3. A developer feeding member according to claim 2 , wherein a part of said mounting member overlaps with said retaining portion as seen in a direction along a longitudinal direction of said shaft.

4. A developer feeding member according to claim 3 , wherein said mounting member and said retaining portion are alternately arranged as seen in a direction perpendicular to the longitudinal direction.

5. A developer feeding member according to claim 3 , wherein said mounting member has a first inclined surface configured and positioned to guide said flexible sheet when said flexible sheet is inserted into said slit to mount said flexible sheet on said shaft, and wherein said retaining portion has a second inclined surface configured and positioned to guide said flexible sheet when said flexible sheet is inserted into said slit to mount said flexible sheet on said shaft.

6. A developing apparatus for developing an electrostatic latent image formed on an electrophotographic photosensitive member, said developing device comprising:

a developing roller configured and positioned to develop the electrostatic latent image with a developer;

a developer accommodating portion configured and positioned to accommodate the developer;

a developer feeding member configured and positioned to feed the developer accommodated in said developer accommodating portion, said developer feeding member including a flexible sheet configured and positioned to feed the developer accommodated in said developer accommodating portion;

a shaft configured and positioned to receive a driving force to rotate said shaft, said shaft having a slit; and

a mounting member disposed in said slit and configured and positioned to mount said flexible sheet on said shaft, wherein said slit is provided between a first surface and a second surface opposed to said first surface, wherein said mounting member is projected from said first surface toward said second surface,

wherein the distance from the first surface to the second surface is larger than a distance from the first surface to an apex of said mounting member.

7. A developing apparatus according to claim 6 , wherein the slit is provided with a retaining portion configured and positioned to prevent disengagement of said flexible sheet from said shaft, said retaining portion being projected from said second surface toward said first surface, wherein distance from the second surface to the first surface is larger than a distance from the second surface to an apex of said retaining portion.

8. A developing apparatus according to claim 7 , wherein a part of said mounting member overlaps with said retaining portion as seen in a direction along a longitudinal direction of said shaft.

9. A developing apparatus according to claim 8 , wherein said mounting member and said retaining portion are alternately arranged as seen in a direction perpendicular to the longitudinal direction.

10. A developer apparatus according to claim 8 , wherein said mounting member has a first inclined surface configured and positioned to guide said flexible sheet when said flexible sheet is inserted into said slit to mount said flexible sheet on said shaft, and wherein said retaining portion has a second inclined surface configured and positioned to guide said flexible sheet when said flexible sheet is inserted into said slit to mount said flexible sheet on said shaft.

11. A process cartridge detachably mountable to an electrophotographic image forming apparatus, comprising:

an electrophotographic photosensitive member;

a developing roller configured and positioned to develop an electrostatic latent image formed on said electrophotographic photosensitive member with the developer;

a developer accommodating portion configured to accommodate the developer;

a developer feeding member configured and positioned to feed the developer accommodated in said developer accommodating portion, said developer feeding member including a flexible sheet configured and positioned to feed the developer accommodated in said developer accommodating portion;

a shaft configured and positioned to receive a driving force to rotate, said shaft having a slit; and

a mounting member disposed in said slit and configured and positioned to mount said flexible sheet on said shaft, wherein said slit is provided between a first surface and a second surface opposed to said first surface, wherein said mounting member is projected from said first surface toward said second surface,

wherein a distance from the first surface to the second surface is larger than a distance from the first surface to an apex of said mounting member.

12. A process cartridge according to claim 11 , wherein the slit is provided with a retaining portion configured and positioned to prevent disengagement of said flexible sheet from said shaft, said retaining portion being projected from said second surface toward said first surface, wherein a distance from the second surface to the first surface is larger than a distance from the second surface to an apex of said retaining portion.

13. A process cartridge according to claim 12 , wherein a part of said mounting member overlaps with said retaining portion as seen in a direction along a longitudinal direction of said shaft.

14. A process cartridge according to claim 13 , wherein said mounting member and said retaining portion are alternately arranged as seen in a direction perpendicular to the longitudinal direction.

15. A process cartridge according to claim 13 , wherein said mounting member has a first inclined surface configured and positioned to guide said flexible sheet when said flexible sheet is inserted into said slit to mount said flexible sheet on said shaft, and wherein said retaining portion has a second inclined surface configured and positioned to guide said flexible sheet when said flexible sheet is inserted into said slit to mount said flexible sheet on said shaft.