Developing cartridge, image forming apparatus having the same, and printing method for an image forming apparatus

1. A developing cartridge usable with an image forming apparatus, comprising:

a developing member supported in a housing of the developing cartridge, the developing member being configured to develop an electrostatic latent image into a visible developer image;

a mounting portion formed in the housing, the mounting portion being configured to accommodate therein a removable developer cartridge containing a supplemental amount of developer; and

a developer storing portion provided in the housing, the developer storing portion being configured to store a first quantity of developer, the developing cartridge being configured to supply the developing member with developer from the first quantity of developer even when the removable developer cartridge is not mounted in the mounting portion.

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

a connecting member formed in the housing, the connecting member being configured to define a fluid communication path between the developer storing portion and the mounting portion such that, when the removable developer cartridge is mounted in the mounting portion, the supplemental amount of developer can be received into the developer storing portion from the removable developer cartridge through the connecting member.

3. The developing cartridge of claim 1 , wherein the mounting portion extends inwardly into the housing parallel to the developing member.

4. The developing cartridge of claim 3 , wherein the mounting portion comprises;

at least one mounting guiding groove for guiding the removable developer cartridge during mounting of the removable developer cartridge into the mounting portion.

5. The developing cartridge of claim 3 , further comprising;

a locking projection formed on the housing adjacent the mounting portion, the locking projection being configured to cooperate with a locking unit of the removable developer cartridge to lock the removable developer cartridge in place when the removable developer cartridge is mounted in the mounting portion.

6. The developing cartridge of claim 2 , wherein the connecting member comprises;

a cover disposed to close the connecting member, the cover being configured to be in an interfering contact with at least a portion of the removable developer cartridge when the removable developer cartridge is mounted in the mounting portion such that the cover becomes open, and the cover being released from the interfering contact when the removable developer cartridge is removed from the mounting portion such that the cover becomes closed.

7. The developing cartridge of claim 1 , further comprising;

a first mounting history indicating member having a characteristic state that is capable of being changed to indicate whether the developing cartridge had been mounted previously.

8. The developing cartridge of claim 7 , wherein;

the first mounting history indicating member comprises an electrical fuse capable of being blown out when subjected to an amount of current.

9. The developing cartridge of claim 7 , wherein the removable developer cartridge is mounted in the mounting portion, and the removable developer cartridge comprises:

a second mounting history indicating member provided on the removable developer cartridge for indicating whether the removable developer cartridge is mounted in the mounting portion.

10. The developing cartridge of claim 9 , wherein;

the second mounting history indicating member comprises an electrode plate capable of being sensed by the image forming apparatus.

11. The developing cartridge of claim 9 , wherein the second mounting history indicating member is disposed on a surface of the removable developer cartridge that is at least partially exposed when the removable developer cartridge is mounted in the mounting portion of the developing cartridge.

12. The developing cartridge of claim 1 , further comprising;

the removable developer cartridge mounted in the mounting portion,

wherein the developing cartridge is configured to supply the developing member with developer received from the removable developer cartridge when the first quantity of developer from the developer storing portion is substantially exhausted.

13. An image forming apparatus, comprising:

a photosensitive member configured to support thereon an electrostatic latent image;

a developing cartridge comprising:

a developing member supported in a housing of the developing cartridge, the developing member being configured to develop the electrostatic latent image into a visible developer image;

a mounting portion formed in the housing, the mounting portion being configured to accommodate therein a removable developer cartridge containing a supplemental amount of developer; and

a developer storing portion provided in the housing, the developer storing portion being configured to store a first quantity of developer; and

a controller configured to determine whether the removable developer cartridge is mounted in the mounting portion, and to cause the developing member to be supplied with developer from the first quantity of developer of the developer storing portion if it is determined that the removable developer cartridge is not mounted in the mounting portion.

14. The image forming apparatus of claim 13 , wherein the controller is further configured to, if it is determined that the removable developer cartridge is mounted in the mounting portion, cause the developing member to be supplied with developer received from the removable developer cartridge when the first quantity of developer from the developer storing portion is substantially exhausted.

15. The image forming apparatus of claim 13 , wherein the controller is further configured to determine a number of printing operations that can be performed in light of an amount of developer available from at least one of the developer storing portion and the removable developer cartridge.

16. The image forming apparatus of claim 13 , further comprising:

a connecting member formed in the housing, the connecting member being configured to define a fluid communication path between the developer storing portion and the removable developer cartridge to allow the supplemental amount of developer can be received into the developer storing portion from the removable developer cartridge through the connecting member.

17. The image forming apparatus of claim 13 , wherein the mounting portion extends inwardly into parallel to the developing member.

18. The image forming apparatus of claim 13 , wherein the mounting portion comprises;

at least one mounting guiding groove for guiding the removable developer cartridge during mounting of the removable developer cartridge into the mounting portion.

19. The image forming apparatus of claim 13 , further comprising;

a locking projection formed on the housing adjacent the mounting portion, the locking projection being configured to cooperate with a locking unit of the removable developer cartridge to lock the removable developer cartridge in place when the removable developer cartridge is mounted in the mounting portion.

20. The image forming apparatus of claim 16 , wherein the connecting member comprises;

a cover disposed to close the connecting member, the cover being configured to be in an interfering contact with at least a portion of the removable developer cartridge when the removable developer cartridge is mounted in the mounting portion such that the cover becomes open, and the cover being released from the interfering contact when the removable developer cartridge is removed from the mounting portion such that the cover becomes closed.

21. The image forming apparatus of claim 13 , further comprising;

a first mounting history indicating member having a characteristic state that is capable of being changed to indicate whether the developing cartridge had been mounted previously.

22. The image forming apparatus of claim 21 , wherein the first mounting history indicating member comprises an electrical fuse capable of being blown out when subjected to an amount of current.

23. The image forming apparatus of claim 13 , wherein the removable developer cartridge is mounted in the mounting portion, and the removable developer cartridge comprises:

a second mounting history indicating member provided on the removable developer cartridge for indicating whether the removable developer cartridge is mounted in the mounting portion.

24. The image forming apparatus of claim 23 , wherein the second mounting history indicating member is disposed on a surface of the removable developer cartridge that is at least partially exposed when the removable developer cartridge is mounted in the mounting portion of the developing cartridge.

25. The image forming apparatus of claim 23 , wherein the second mounting history indicating member comprises an electrode plate, the controller being configured to determine whether the electrode plate is present.

26. A method of controlling an image forming apparatus, comprising:

determining whether a removable developer cartridge is mounted in a developing unit of the image forming apparatus, the developing unit including a developing member configured to use developer to develop an electrostatic latent image into a visible developer image during a printing operation; and

if it was determined that the removable developer cartridge is not mounted, performing a printing operation using developer available in a developer storing portion provided in the developing unit.

27. The method of controlling the image forming apparatus as set forth in claim 26 , further comprising:

if it was determined that the removable developer cartridge is mounted in the developing unit, determining if there is developer available in the developer storing portion; and

performing a printing operation using developer available in the developer storing portion if it is determined that there is developer available in the developer storing portion.

28. The method of controlling the image forming apparatus as set forth in claim 27 , further comprising:

performing a printing operation using developer received from the removable developer cartridge if it is determined that there is no developer available in the developer storing portion.

29. The method of controlling the image forming apparatus as set forth in claim 26 , further comprising:

if it was determined that the removable developer cartridge is not mounted in the developing unit, determining if there is developer available in the developer storing portion; and

providing an alert message that supply of developer has been exhausted if it is determined that there is no developer available in the developer storing portion.

30. The method of controlling the image forming apparatus as set forth in claim 26 , wherein the developing unit comprises a developing cartridge detachably supported in the image forming apparatus, the method further comprises:

determining whether a developing cartridge is installed in the image forming apparatus;

determining, if the developing cartridge is determined to be installed, whether the installed developing cartridge is new or used; and

determining a total number of print media on which printing operation can be performed, the total number being a first number of print media that can be printed with a first quantity of developer stored in the developer storing portion provided in the developing cartridge if it is determined that a new developing cartridge is installed, to which no removable developer cartridge is mounted, and the total number being a second number of print media that can be printed with a sum of the first quantity and a second quantity of developer available in the removable developer cartridge if it is determined that a new developing cartridge is installed, to which the removable developer cartridge is mounted.

31. The method of controlling the image forming apparatus as set forth in claim 30 , further comprising:

performing printing operations on the first number of print media if it was determined that a new developing cartridge is installed, to which the removable developer cartridge is not mounted; and

providing an alert message that supply of developer has been exhausted after performing printing operations on the first number of print media.

32. The method of controlling the image forming apparatus as set forth in claim 30 , further comprising:

performing printing operations on the second number of print media if it was determined that a new developing cartridge is installed, to which the removable developer cartridge is mounted; and

providing an alert message that supply of developer has been exhausted after performing printing operations on the second number of print media.

33. A developer cartridge capable of being detachably received into a mounting portion provided in a developing cartridge detachably supported in an image forming apparatus, comprising:

a developer receiving portion formed inside the developer cartridge to store an amount of supplemental developer;

an outlet formed in the developer cartridge, the outlet, when the developer cartridge is mounted in the mounting portion of the developing cartridge, being in fluid communication with a developer storing portion of the developing cartridge, the developer storing portion providing a storage for a quantity of developer, and

a developer conveying member rotatably disposed inside the developer receiving portion, the developer conveying member, when the developer cartridge is mounted in the mounting portion of the developing cartridge, being controlled by a controller of the image forming apparatus to convey the supplementary developer to the developing cartridge through the outlet after the quantity of developer stored in the developer storing portion of the developing cartridge is exhausted.

34. The developer cartridge of claim 33 , further comprising:

a mounting indicating member provided on the developer cartridge for indicating whether the developer cartridge is mounted in the mounting portion.

35. The developer cartridge of claim 34 , wherein the mounting indicating member is disposed on a surface of the developer cartridge that is at least partially exposed when the developer cartridge is mounted in the mounting portion of the developing cartridge.

36. The developer cartridge of claim 34 , wherein the mounting indicating member comprises an electrode plate capable of being sensed by the image forming apparatus.

37. The developer cartridge of claim 33 , further comprising:

a waste developer receiving portion formed in the developer cartridge adjacent the developer receiving portion, the waste developer receiving portion providing a collection space for storing waste developer received from the developing cartridge.

38. The developer cartridge of claim 33 , further comprising:

at least one mounting guide formed on the developer cartridge, the at least one mounting guide being configured to correspond to and to cooperate with at least one mounting guiding groove formed in the mounting portion of the developing cartridge to guide the developer cartridge in place during mounting of the developer cartridge in the mounting portion.

39. The developer cartridge of claim 33 , further comprising:

a locking unit formed on the developer cartridge, the locking unit being configured to couple with a locking projection formed on the developing cartridge to lock the developer cartridge in place in the developing cartridge.