Developer cartridge and image forming apparatus

1. A cartridge attachable to and detachable from a main body of an image forming apparatus comprising:

a developer roller configured to face a photosensitive member;

a frame including the developer roller and in contact with an urging unit, wherein the urging unit is configured to urge the developer roller towards the photosensitive member, further wherein the urging unit is configured to transfer a voltage from a power supply unit to the developer roller;

a cartridge electrode capable of connection to a main body electrode, wherein the main body electrode is connected to the power supply unit, the cartridge electrode is electrically coupled with the developer roller, and at least one of the main body electrode and the cartridge electrode includes the urging unit; and

a protrusion extending outward in an axis direction of the developer roller from side walls of the frame, positioned on the side walls of the frame, and including the cartridge electrode.

2. The cartridge according to claim 1 , wherein the cartridge electrode is configured to provide an urging force that urges the developer roller toward the photosensitive member when the cartridge is attached to the main body.

3. The cartridge according to claim 1 , wherein:

the cartridge electrode is disposed at a first position opposite a second position where the developer roller is provided in the frame and electrically coupled with a shaft of the developer roller; and

the cartridge electrode is pressed by the main body electrode to provide the urging force that urges the developer roller to the photosensitive member.

4. The cartridge according to claim 3 , further including a cover member disposed at the main body, wherein the main body electrode is attached to the cover member.

5. The cartridge according to claim 1 , wherein the cartridge electrode receives the urging force from the main body electrode.

6. The cartridge according to claim 1 , wherein the cartridge electrode includes the urging unit.

7. The cartridge according to claim 1 , wherein the main body electrode includes the urging unit.

8. The cartridge according to claim 1 , wherein

the urging unit is positioned on the side walls of the frame in a longitudinal direction for urging the developer roller toward the photosensitive member and has a contact portion that is disposed at a tip of the urging member; and

the contact portion extends to the side of the frame, wherein the power supply unit is electrically connected to the developer roller via the contact portion.

9. The cartridge according to claim 8 , wherein the contact portion includes an inclined surface in a direction in which the contact portion extends.

10. An image forming apparatus comprising:

a main body; and

a cartridge attachable to and detachable from the main body,

the cartridge including:

a frame; and

a developer roller disposed at the frame, the developer roller configured to face a photosensitive member;

an urging unit disposed at the frame and configured to generate an urging force that urges the developer roller toward the photosensitive member, further wherein the urging unit is electrically connected to a power supply unit; and

a cartridge electrode capable of connection to a main body electrode, wherein the main body electrode is connected to the power supply unit, the cartridge electrode is electrically coupled with the developer roller, and at least one of the main body electrode and the cartridge electrode includes the urging unit; and

a protrusion extending outward in an axis direction of the developer roller from side walls of the frame, positioned on the side walls of the frame, and including the cartridge electrode.

11. An image forming apparatus comprising:

a main body;

a cartridge attachable to and detachable from the main body, the cartridge including:

a frame; and

a developer roller disposed at the frame, the developer roller configured to face a photosensitive member;

an urging unit disposed at the main body and configured to generate an urging force that urges the developer roller toward the photosensitive member, further wherein the urging unit is electrically connected to a power supply unit; and

a base member having a concavity therein, wherein the frame has a wall at a side opposite from the side at which the developer roller is provided, and the base member is disposed on the wall.

12. A developer cartridge comprising:

a frame having a toner chamber that accommodates toner;

a developer roller disposed at the frame and exposed outward from the frame;

a developer electrode disposed at the frame and electrically connected to the developer roller, and comprising:

a contact member having a contact point;

a spring member located between the frame and the contact member; and

a guide member guiding the spring member;

wherein the spring member urges the frame so that the developer roller moves in a direction outward from the frame.

13. The developer cartridge according to claim 12 , further comprising:

a base member that is pressed by the spring member,

a bearing member that supports the developer roller, and

a connect member that connects the base member and the bearing member.

14. The developer cartridge according to claim 12 ,

wherein the frame includes a first portion at which the developer roller is disposed and a second portion located opposite the first portion with respect to the toner chamber, and the developer electrode is disposed at the second portion.

15. The developer cartridge according to claim 12 ,

wherein the frame includes a first wall disposed on one of the side walls and a second wall disposed on the other of the side walls; and

the developer electrode is disposed at at least one of the first wall and the second wall.

16. The developer cartridge according to claim 15 , wherein the developer electrode extends in an axial direction of the developer roller.