Developing cartridge including housing having opening for filling housing with developer

1. A developing cartridge comprising:

a housing;

a developing roller rotatable around a rotation axis extending in a first direction;

a developing gear supported by an end portion of the developing roller;

a driving force receiving member rotatable around a rotation axis extending in the first direction by receiving a driving force from an image forming apparatus body and including a gear portion engaging with the developing gear; and

a supply roller located inside the housing on one side in a third direction, which is perpendicular to both the first direction and a second direction perpendicular to the first direction, and configured to supply developer to the developing roller,

wherein the housing has an opening for filling the housing with developer,

wherein at least a part of the driving force receiving member overlaps the opening when viewed in the first direction,

wherein the opening is located on another side in the third direction with respect to the supply roller.

2. The developing cartridge according to claim 1 ,

wherein the housing includes a first side wall and a second side wall which are located with a gap therebetween, and

wherein the first side wall has the opening.

3. The developing cartridge according to claim 2 , wherein the developing roller is located between the first side wall and the second side wall.

4. The developing cartridge according to claim 2 , further comprising a support shaft located on an opposite side of the first side wall than the second side wall and configured to rotatably support the driving force receiving member,

wherein the support shaft has a penetration hole communicating with the opening.

5. The developing cartridge according to claim 2 , further comprising a support shaft rotatably supporting the driving force receiving member and having a cylindrical shape,

wherein the opening is located in the support shaft.

6. The developing cartridge according to claim 5 , wherein the support shaft is extending in the first direction.

7. The developing cartridge according to claim 2 , further comprising a closing member closing the opening,

wherein the closing member is located between the opening and the driving force receiving member.

8. The developing cartridge according to claim 1 , wherein, when projected in the first direction, at least a part of the opening is located outside a projection area of the driving force receiving member.

9. The developing cartridge according to claim 1 , further comprising:

a supply roller configured to supply developer to the developing roller; and

a supply gear configured to engage with the gear portion and transmit a driving force from the driving force receiving member to the supply roller.

10. A developing cartridge comprising:

a housing configured to contain developer therein and including a first side wall and a second side wall which are located with a gap therebetween;

a developing roller located between the first side wall and the second side wall and configured to rotate around a rotation axis extending in a first direction;

a supply roller located between the first side wall and the second side wall and configured to supply developer to the developing roller by rotating around a rotation axis extending in the first direction; and

a driving force receiving member located on an opposite side of the first side wall than the second side wall, configured to rotate around a rotation axis extending in the first direction, and configured to rotate the developing roller and the supply roller by receiving a driving force from an image forming apparatus body,

wherein the first side wall has an opening for filling the housing with developer, and

wherein, when viewed in the first direction, at least a part of the opening is located at the developing roller side of the driving force receiving member rather than at a side of a tangent line passing through one edge point among two edge points of the driving force receiving member, the two edge points being edge points at which straight lines, which are parallel to a straight line orthogonal to both the rotation axis of the supply roller and the rotation axis of the driving force receiving member, respectively serve as tangent lines of the driving force receiving member, and the one edge point being located farthest from the developing roller among the two edge points.

11. The developing cartridge according to claim 10 ,

wherein the supply roller is located inside the housing on one side in a third direction, which is perpendicular to both the first direction and a second direction perpendicular to the first direction,

wherein the opening is located on another side in the third direction with respect to the supply roller.

12. The developing cartridge according to claim 10 , further comprising a support shaft located on an opposite side of the second side wall with respect to the first side wall and configured to rotatably support the driving force receiving member,

wherein the support shaft has a penetration hole communicating with the opening.

13. The developing cartridge according to claim 10 , further comprising a closing member closing the opening,

wherein the closing member is located between the opening and the driving force receiving member.

14. The developing cartridge according to claim 10 , wherein, when projected in the first direction, at least a part of the opening is located outside a projection area of the driving force receiving member.

15. The developing cartridge according to claim 10 , further comprising:

a developing gear supported by an end portion of the developing roller;

a gear portion engaging with the developing gear; and

a supply gear configured to engage with the gear portion and transmit a driving force from the driving force receiving member to the supply roller,

wherein the driving force receiving member includes the gear portion.

16. A developing cartridge comprising:

a housing including,

a first side wall and a second side wall which are located with a gap therebetween,

a developer containing chamber configured to contain developer therein, and

a development chamber communicating with the developer containing chamber and accommodating therein a developing roller which is configured to rotate around a rotation axis extending in a first direction in which the first side wall and the second side wall face each other; and

a driving force receiving member located on an opposite side of the first side wall than the second side wall, configured to rotate around a rotation axis extending in the first direction, and configured to rotate the developing roller by receiving a driving force from an image forming apparatus body,

wherein the first side wall has an opening for filling the housing with developer, and

wherein at least a part of the opening is located at the developing roller side of the driving force receiving member rather than at a side of a straight line extending along a third direction and passing through one edge point among two edge points of the driving force receiving member, the developer containing chamber and the development chamber being arranged in a second direction, the two edge points being edge points of the driving force receiving member in the second direction when the driving force receiving member is projected in the third direction perpendicular to both the first direction and the second direction, and the one edge point being located farthest from the developing roller among the two edge points.