Developing cartridge, developing apparatus and image forming apparatus having the same

1. A developing cartridge that is couplable to an image forming apparatus, the developing cartridge comprising:

a developing portion;

a toner storing portion to store toner;

a partition wall formed between the developing portion and the toner storing portion, to block the toner in the toner storing portion from moving to the developing portion, the partition wall having a toner supply section through which the toner in the toner storing portion is supplied to the developing portion;

a first agitating member rotatably disposed in the developing portion; and

a second agitating member rotatably disposed in the toner storing portion,

wherein at least one of the first agitating member or the second agitating member includes an elastic member to be in contact with the partition wall formed to block the toner.

2. The developing cartridge of claim 1 , wherein,

when the second agitating member including the elastic member rotates, the elastic member of the second agitating member is to be intermittently in contact with the partition wall and is not in contact with an inner surface of the toner storing portion.

3. The developing cartridge of claim 2 , wherein

the second agitating member includes a rotation member, and

the elastic member includes an elastic film attached to the rotation member,

wherein the elastic film is to be in contact with an upper surface of the partition wall and moves toner toward the toner supply section by an elastic restoring force generated when the elastic film is separated from the upper surface of the partition wall.

4. The developing cartridge of claim 1 , wherein

the first agitating member is disposed below the partition wall, and a rotation center of the first agitating member is spaced apart from vertical extension lines of opposite ends of the toner supply section.

5. The developing cartridge of claim 4 , wherein,

the first agitating member includes the elastic member,

the first agitating member includes a rotation member, and

the elastic member includes at least one elastic film attached to the rotation member, and

wherein the at least one elastic film is in contact with a lower surface of the partition wall when the first agitating member rotates.

6. The developing cartridge of claim 5 , wherein

the at least one elastic film of the first agitating member includes a first elastic film and a second elastic film that are disposed at an interval of about 90 degrees on the rotation member.

7. The developing cartridge of claim 6 , wherein the first elastic film and the second elastic film are formed to move toner in mutually opposite directions.

8. The developing cartridge of claim 6 ,

wherein each elastic film of the first elastic film and the second elastic film includes a plurality of protrusions formed at intervals on one side to move toward the partition wall, and

wherein each protrusion of the plurality of protrusions is formed in a trapezoidal shape, in which a length of a first side of each protrusion connected to the first elastic film or the second elastic film is shorter than a length of a second side of each protrusion that is to be in contact with the partition wall.

9. The developing cartridge of claim 8 , wherein

each of the plurality of protrusions includes a first side wall perpendicular to the first side and a second side wall inclined with respect to the first side, and

wherein a direction of the second side wall of each of the plurality of protrusions of the first elastic film is opposite to a direction of the second side wall of each of the plurality of protrusions of the second elastic film.

10. The developing cartridge of claim 1 , further comprising:

a developing roller rotatably disposed in the developing portion; and

a supply roller disposed at one side of the developing roller, the supply roller to supply toner supplied from the toner storing portion to the developing roller,

wherein a rotation center of the first agitating member is positioned between a rotation center of the developing roller and a rotation center of the supply roller.

11. The developing cartridge of claim 10 , further comprising:

a cartridge driver in one side surface of the developing cartridge and to receive power from an outside of the cartridge driver;

a first supply roller driver at a first end of the supply roller and to be rotated by a driving force transmitted from the cartridge driver;

a second supply roller driver at a second end opposite to the first end of the supply roller;

a first agitating member driver at one end of the first agitating member and to receive the driving force from the second supply roller driver; and

a second agitating member driver at one end of the second agitating member and to receive the driving force from the first agitating member driver,

wherein the second supply roller driver, the first agitating member driver, and the second agitating member driver are positioned on an opposite side surface opposite to a side surface of the developing cartridge with respect to a longitudinal direction of the developing cartridge.

12. The developing cartridge of claim 11 , wherein

the second agitating member driver is to repeat rotating and stopping while the first agitating member driver rotates.

13. The developing cartridge of claim 11 , wherein

the second agitating member driver includes a Geneva gear.

14. The developing cartridge of claim 11 , comprising

a plurality of electrical contacts on the opposite side surface of the developing cartridge, to receive a voltage applied to the developing roller and the supply roller.

15. The developing cartridge of claim 1 , further comprising:

a blade supporting wall extending downward from a lower surface of the partition wall,

wherein, when the first agitating member including the elastic member and rotates, the elastic member of the first agitating member is to be in contact with the blade supporting wall and the lower surface of the partition wall.

16. A developing cartridge comprising:

a developing portion in which a developing roller is rotatably disposed;

a toner storing portion which is disposed above the developing portion and is to store toner;

a partition wall which is formed between the developing portion and the toner storing portion and is provided with a toner supply section through which the toner moves from the toner storing portion to the developing portion;

a first agitating member which is rotatably disposed inside the developing portion and agitates the toner supplied to the developing portion; and

a second agitating member which is rotatably disposed inside the toner storing portion and agitates the toner stored in the toner storing portion,

wherein the first agitating member is disposed below the partition wall, and a rotation center of the first agitating member is spaced apart from vertical extension lines of opposite ends of the toner supply section.

17. The developing cartridge of claim 16 , wherein

the first agitating member includes a rotation member and an elastic member attached to the rotation member, and

wherein when the first agitating member rotates, the elastic member is intermittently in contact with a lower surface of the partition wall.

18. The developing cartridge of claim 16 , wherein

the second agitating member includes a rotation member and an elastic member attached to the rotation member, and

wherein when the second agitating member rotates, the elastic member is intermittently in contact with an upper surface of the partition wall and is not in contact with an inner surface of the toner storing portion.

19. A developing apparatus comprising:

an image carrier cartridge including an image carrier; and

a developing cartridge to supply toner to the image carrier,

wherein the developing cartridge comprises:

a developing portion;

a toner storing portion to store toner;

a partition wall formed between the developing portion and the toner storing portion and provided with a toner supply section through which the toner in the toner storing portion is supplied to the developing portion;

a first agitating member rotatably disposed in the developing portion; and

a second agitating member rotatably disposed in the toner storing portion,

wherein at least one of the first agitating member or the second agitating member includes an elastic member to be in contact with the partition wall formed.

20. An image forming apparatus comprising:

a print medium feeding apparatus to feed a print medium;

a developing apparatus to form a toner image of an image carrier;

a transferring apparatus to transfer the toner image onto the print medium;

a fixing apparatus to fix the toner image onto the print medium; and

a print medium discharging apparatus to discharge the print medium,

wherein the developing apparatus comprises:

an image carrier cartridge including the image carrier; and

a developing cartridge to supply toner to the image carrier,

wherein the developing cartridge comprises,

a developing portion;

a toner storing portion to store toner;

a partition wall formed between the developing portion and the toner storing portion and provided with a toner supply section through which the toner in the toner storing portion is supplied to the developing portion;

a first agitating member rotatably disposed in the developing portion; and

a second agitating member rotatably disposed in the toner storing portion,

wherein at least one of the first agitating member or the second agitating member includes an elastic member to be in contact with the partition wall formed.