Unit and image forming apparatus

1. A unit for use with an image forming apparatus, said unit comprising:

a frame;

a developer accommodating portion, constituted by said frame, for accommodating developer;

a first end portion seal member for preventing, at a longitudinal end portion of a rotatable member, the developer from leaking out from between said frame and said rotatable member; and

a second end portion seal member for preventing the developer from leaking out from among said first end portion seal member, said second end portion seal member, and said frame, wherein said second end portion seal member is formed by injecting, on said frame, a resin material having an elastic modulus smaller than an elastic modulus of said frame so as to enter said first end portion seal member to be integrated with said first end portion seal member,

wherein said second end portion seal member is projected from said frame and inclined with respect to the longitudinal direction.

2. A unit according to claim 1 , further comprising,

a sheet member contacting said rotatable member and provided on said frame along the longitudinal direction; and

a resin member for fixing said sheet member on said frame, wherein said resin member is formed by injecting a resin material on said frame and is mounted on said frame by welding of said sheet member,

wherein leakage of the developer from between said frame and the rotatable member is prevented by said first end portion seal member, said second end portion seal member, and said sheet member.

3. A unit according to claim 2 , wherein said resin material that forms said resin member has an elastic modulus smaller than the elastic modulus of said frame.

4. A unit according to claim 2 , wherein said second end portion seal member is integrally molded with said resin member.

5. A unit according to claim 1 , wherein said second end portion seal member is molded at a recessed portion provided in said frame.

6. A unit according to claim 2 , wherein said second end portion seal member has an elastic modulus smaller than an elastic modulus of said sheet member.

7. A unit according to claim 2 , wherein said sheet member is welded on said second end portion seal member by heating.

8. A unit according to claim 2 , wherein said second end portion seal member contains carbon black capable of absorbing near infrared ray,

wherein said sheet member is capable of passing the near infrared ray therethrough, and

wherein said second end portion seal member generates heat by absorbing the infrared ray to weld said sheet member.

9. A unit according to claim 1 , wherein said first end portion seal member is constituted by an elastic member or fibers.

10. A unit according to claim 1 , wherein said rotatable member is an image bearing member, and

wherein said developer accommodating portion accommodates the developer removed from the image bearing member.

11. A unit according to claim 10 , which is a cartridge detachably mountable to a main assembly of the image forming apparatus.

12. A unit according to claim 1 , wherein said rotatable member is a developer carrying member for developing a latent image formed on an image bearing member, and

wherein said developer accommodating portion accommodates the developer used for developing the latent image.

13. A unit according to claim 12 , which is a cartridge detachably mountable to a main assembly of the image forming apparatus.

14. An image forming apparatus for forming an image on a recording material, said image forming apparatus comprising:

a frame;

a developer accommodating portion, constituted by said frame, for accommodating developer;

a first end portion seal member for preventing, at a longitudinal end portion of a rotatable member, the developer from leaking out from between said frame and said rotatable member; and

a second end portion seal member for preventing the developer from leaking out from among said first end portion seal member, said second end portion seal member, and said frame, wherein said second end portion seal member is formed by injecting, on said frame, a resin material having an elastic modulus smaller than an elastic modulus of said frame so as to enter said first end portion seal member to be integrated with said first end portion seal member,

wherein said second end portion seal member is projected from said frame and inclined with respect to the longitudinal direction.

15. An image forming apparatus according to claim 14 , further comprising,

a sheet member contacting said rotatable member and provided on said frame along the longitudinal direction; and

a resin member for fixing said sheet member on said frame, wherein said resin member is formed by injecting a resin material on said frame and is mounted on said frame by welding of said sheet member,

wherein leakage of the developer from between said frame and the rotatable member is prevented by said first end portion seal member, said second end portion seal member, and said sheet member.

16. An image forming apparatus according to claim 15 , wherein said resin material that forms said resin member has an elastic modulus smaller than the elastic modulus of said frame.

17. An image forming apparatus according to claim 15 , wherein said second end portion seal member is integrally molded with said resin member.

18. An image forming apparatus according to claim 15 , wherein said second end portion seal member is molded at a recessed portion provided in said frame.

19. An image forming apparatus according to claim 15 , wherein said second end portion seal member has an elastic modulus smaller than an elastic modulus of said sheet member.

20. An image forming apparatus according to claim 15 , wherein said sheet member is welded on said second end portion seal member by heating.

21. An image forming apparatus according to claim 15 , wherein said second end portion seal member contains carbon black capable of absorbing near infrared ray,

wherein said sheet member is capable of passing the near infrared ray therethrough, and

wherein said second end portion seal member generates heat by absorbing the infrared ray to weld said sheet member.

22. An image forming apparatus according to claim 15 , wherein said first end portion seal member is constituted by an elastic member or fibers.