Image forming apparatus having a mountable unit for discharging developer

1. An image forming apparatus comprising:

a photosensitive unit including a photosensitive member, cleaning means configured to remove a developer from the photosensitive member, and a discharge opening configured to permit discharge of the developer removed from the photosensitive member, the photosensitive unit being mountable in and dismountable from the image forming apparatus;

a pair of frame members provided opposed to each other through a space in which the photosensitive unit is mounted;

a first developer receiving portion connected to the discharge opening of the photosensitive unit and configured to receive the developer discharged through the discharge opening; and

a first developer feeding portion connected to the first developer receiving portion and configured to feed the developer received from the first developer receiving portion to a developer collecting portion,

wherein the first developer receiving portion is provided inside the space sandwiched between the pair of frame members,

wherein the first developer feeding portion is provided outside the space,

wherein the developer collecting portion is provided inside the space,

wherein the photosensitive unit is mounted and dismounted in a direction of an axis which is a rotation center of the photosensitive member,

wherein the pair of frame members is provided on a frame front side and a rear side, respectively, of the photosensitive unit with respect to a mounting direction, and

wherein the first developer receiving portion is provided on the frame member provided on the rear side.

2. An image forming apparatus according to claim 1 , wherein the first developer receiving portion includes an opening configured to receive the developer discharged through the photosensitive unit and a first developer feeding member configured to feed the received developer to the first developer feeding portion, and

wherein the opening and a part of the first developer feeding member are provided inside the space sandwiched between the frame members.

3. An image forming apparatus according to claim 2 , wherein the first developer feeding member includes a driving force receiving portion configured to receive a driving force from the first developer feeding portion, and

wherein the first developer feeding member is configured to be rotated by reception of the driving force from the first developer feeding portion by the driving force receiving portion.

4. An image forming apparatus according to claim 1 , wherein the first developer feeding portion includes a first developer feeding member configured to feed the developer, and

wherein the first developer feeding member is connected to a driving gear configured to be rotated by receiving a driving force from a driving source.

5. An image forming apparatus according to claim 4 , wherein the first developer feeding member is a feeding member having a helical shape.

6. An image forming apparatus according to claim 1 , wherein the image forming apparatus includes a plurality of photosensitive units mountable in and dismountable from the image forming apparatus and includes a plurality of first developer receiving portions corresponding to the photosensitive units, respectively, and

wherein each of the first developer receiving portions is connected to a single first developer feeding portion.

7. A image forming apparatus according to claim 1 , further comprising a driving portion configured to drive the photosensitive member of the photosensitive unit,

wherein the driving portion is provided outside the space sandwiched between the frame members.

8. An image forming apparatus according to claim 1 , further comprising,

a developer accommodating portion configured to accommodate the developer and a developing portion provided with a receiving opening for receiving the developer supplied from the developer accommodating portion, which are mountable and dismountable from the image forming apparatus,

a second developer receiving portion connected to the developer accommodating portion and configured to receive the developer supplied from the developer accommodating portion,

a second developer feeding portion connected to the second developer receiving portion and configured to feed the developer received by the second developer receiving portion to the developing portion, and

a developer supplying portion connected to the second developer feeding portion and the receiving opening of the developing portion and configured to supply the developer to the developing portion through the receiving opening,

wherein the second developer receiving portion, the second developer feeding portion and the developer supplying portion are provided inside the space sandwiched between the frame members.

9. An image forming apparatus according to claim 8 , wherein the photosensitive unit and the developing portion are integrally assembled into a process cartridge mountable in and dismountable from the image forming apparatus.

10. An image forming apparatus according to claim 8 , wherein the developer accommodating portion is provided below the developing portion with respect to a vertical direction.

11. An image forming apparatus comprising:

a photosensitive unit including a photosensitive member, cleaning means configured to remove a developer from the photosensitive member, and a discharge opening configured to permit discharge of the developer removed from the photosensitive member, the photosensitive unit being mountable in and dismountable from the image forming apparatus;

a pair of frame members provided opposed to each other through a space in which the photosensitive unit is mounted;

a developer receiving portion connected to the discharge opening of the photosensitive unit and configured to receive the developer discharged through the discharge opening; and

a developer collecting portion connected to the developer receiving portion and configured to collect the developer received from the developer receiving portion,

wherein the developer receiving portion is provided inside the space sandwiched between the frame members,

wherein the developer collecting portion is provided outside the space,

wherein the photosensitive unit is mounted and dismounted in a direction of an axis which is a rotation center of the photosensitive member,

wherein the pair of frame members is provided on a frame front side and a rear side, respectively, of the photosensitive unit with respect to a mounting direction,

wherein the developer receiving portion is provided on the frame member provided on the rear side, and

wherein when viewed in the direction of the axis, the developer receiving portion and the developer collecting portion partially overlap.

12. An image forming apparatus according to claim 11 , wherein the developer receiving portion includes an opening configured to receive the developer discharged through the photosensitive unit and a developer feeding member configured to feed the received developer to the developer accommodating collecting portion, and

wherein the opening and a part of the developer feeding member are provided inside the space sandwiched between the frame members.

13. An image forming apparatus according to claim 11 , wherein the developer collecting portion is mountable in and dismountable from the image forming apparatus.

14. An image forming apparatus according to claim 12 , wherein the developer feeding member is a feeding member having a helical shape.