Image forming apparatus and a storage controlling method for information on an improper detachment of a developer cartridge to be written in a cartridge storage means

1. An image forming apparatus, comprising:

a developer cartridge containing a toner and detachably mountable into an apparatus main body;

a cartridge storage means for saving intrinsic information including information on the life of said developer cartridge provided in said developer cartridge; and

a main-body controlling means for reading information written in said cartridge storage means of said developer cartridge being mounted when a power supply is restored from an improper shutoff thereof.

2. An image forming apparatus according to claim 1 , wherein

a cartridge exchange mode in which said developer cartridge is exchanged is provided as an operation mode in addition to an image forming mode in which the image formation is carried out, and

said main-body controlling means writes exchange completion information indicating that the exchange has been normally completed in said cartridge storage means at a specified timing in the cartridge exchange mode and judges whether or not the exchange completion information is written in said cartridge storage means of said developer cartridge being mounted when the power supply is restored.

3. An image forming apparatus according to claim 2 , further comprising:

a cartridge supporting means which is movable relative to the apparatus main body and into which at least one developer cartridge is mountable;

a driving means for driving said cartridge supporting means to position said cartridge supporting means at least to a specified detachment position and a specified reading/writing position; and

a drive controlling means for controlling the operation of said driving means to control the positioning of said cartridge supporting means,

wherein

the detachment position is such a position where said developer cartridge can be detached through a developer cartridge opening formed in the apparatus main body,

the reading/writing position is such a position where the reading and writing from and in said cartridge storage means by said main-body controlling means are possible,

said main-body controlling means reads information written in said cartridge storage means of said developer cartridge to be exchanged to judge whether or not the exchange completion information is written at the start of the cartridge exchange mode, and executes an exchange preparation of clearing the exchange completion information when it is judged that the exchange completion information is written, and

said drive controlling means first positions said cartridge supporting means to the reading/writing position at the start of the cartridge exchange mode and then positions said cartridge supporting means to the detachment position after the completion of the exchange preparation by said main-body controlling means.

4. An image forming apparatus according to claim 3 , further comprising:

a main-body storage means provided in the apparatus main body; and

a life calculating means for calculating an added value of values corresponding to an amount of toner consumed every time a series of image forming operations are performed in the image forming mode, calculating a life value corresponding to a remaining amount of the toner in said developer cartridge based on the added value, and renewably saving the calculated life value in said main-body storage means,

wherein said main-body controlling means renewably writes the life value as the information on the life in said cartridge storage means of said developer cartridge to be exchanged as the exchange preparation.

5. An image forming apparatus according to claim 4 , wherein

said main-body controlling means reads, in the cartridge exchange mode, the information written in said cartridge storage means of said developer cartridge mounted into the apparatus main body to judge whether or not the exchange completion information is written, and reads at least the information on the life written in said cartridge storage means and writes it in said main-body storage means when it is judged that the exchange completion information is not written, and

said life calculating means calculates the life value based on the information on the life and the added value.

6. An image forming apparatus according to claim 5 , further comprising a power supply restoration recovery processing means for executing a specified power supply restoration recovery processing when said main-body controlling means judges, at the time of restoring the power supply, that the exchange completion information is not written in said cartridge storage means of said developer cartridge being mounted.

7. An image forming apparatus according to claim 6 , wherein said power supply restoration recovery processing means gives an improper mounting notification that said developer cartridge being mounted is the one that was improperly mounted without writing the exchange completion information as the power supply restoration recovery processing.

8. An image forming apparatus according to claim 7 , wherein said main-body controlling means reads at least the information on the life written in said cartridge storage means of said developer cartridge being mounted and writes it in said main-body storage means after the improper mounting notification by said power supply restoration recovery processing means.

9. An image forming apparatus according to claim 8 , wherein said power supply restoration recovery processing means judges that the improper mounting had been done during the improper shutoff of the power supply before the power supply was restored and displays a message urging the re-exchange of said developer cartridge detached from the apparatus main body during the shutoff of the power supply as the power supply restoration recovery processing.

10. An image forming apparatus according to claim 3 , wherein said cartridge supporting means is so constructed as to rotate said developer cartridge about an axis of rotation substantially normal to an opening plane of the developer cartridge opening.

11. An image forming apparatus according to claim 1 , wherein said main-body controlling means performs the reading and writing from and in said cartridge storage means only during the cartridge exchange mode except at the time of restoring the power supply.

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

a nonvolatile memory provided in the apparatus main body for saving improper power-supply shutoff information indicating that the power supply was improperly shut off; and

a power-supply application judging means for reading information written in said nonvolatile memory when the apparatus is turned on to judge whether or not the improper power-supply shutoff information is written, and judging that the apparatus is turned on to restore the power supply from the improper shutoff when it is judged that the improper power-supply shutoff information is written,

wherein said main-body controlling means reads the information written in said cartridge storage means of said developer cartridge being mounted when said power-supply application judging means judges that the apparatus is turned on to restore the power supply from the improper shutoff.

13. A method for controlling the storage of information on the completion of the exchange of a developer cartridge in an image forming apparatus in which said developer cartridge containing a toner is detachably mountable into an apparatus main body, a cartridge storage means for saving intrinsic information including information on the life of said developer cartridge is provided in said developer cartridge, and a cartridge exchange mode in which said developer cartridge is exchanged is provided as an operation mode in addition to an image forming mode in which the image formation is carried out, said method comprising the steps of:

writing exchange completion information indicating that the exchange has been normally completed in said cartridge storage means of said developer cartridge mounted into the apparatus main body at the time of mounting said developer cartridge in the cartridge exchange mode; and

reading information written in said cartridge storage means of said developer cartridge being mounted at the time of restoring a power supply from an improper shutoff.