Image forming apparatus, correction control method and computer readable information recording medium

1. An image forming apparatus for which a first mode for executing image forming that uses toners of plural colors including a black toner and a second mode for executing image forming that uses only the black toner can be set, comprising:

a first printing cumulatively counting part that cumulatively counts a first number of pages for which image forming has been executed by using the toners of plural colors;

a first printing determining part that determines whether the first number of pages counted by the first printing cumulatively counting part has exceeded a threshold; and

a correction control part that controls not to execute a correcting process for image forming that uses the toners of plural colors, and controls to execute a correcting process for image forming that uses only the black toner, when the second mode has been set in a case where the first printing determining part has determined that the first number of pages has exceeded the threshold.

2. The image forming apparatus as claimed in claim 1 , further comprising:

a requesting part that generates an execution request to execute the correcting process for image forming that uses the toners of plural colors, in a case where the first printing determining part has determined that the first number of pages has exceeded the threshold;

a second printing cumulatively counting part that cumulatively counts a second number of pages for which image forming has been executed by using only the black toner;

a second printing determining part that determines whether the second number of pages cumulatively counted by the second printing cumulatively counting part has exceeded a threshold; and

a mode determining part that determines whether the first mode or the second mode has been set, before a start of a job, wherein:

the requesting part generates an execution request to execute the correcting process for image forming that uses only the black toner, in a case where the second printing determining part has determined that the second number of pages has exceeded the threshold, and

the correction control part determines whether to execute a determination as to whether the execution request to execute the correcting process for image forming that uses the toners of plural colors exists or a determination as to whether the execution request to execute the correcting process for image forming that uses only the black toner exists, according to a determination result of the mode determining part, and controls to execute the correcting process according to a determination result of the correction control part.

3. The image forming apparatus as claimed in claim 2 , wherein:

the correction control part determines whether to execute a determination as to whether the execution request to execute the correcting process for image forming that uses only the black toner exists or a determination as to whether the execution request to execute the correcting process for image forming that uses the toners of plural colors exists, according to the setting of the first mode or the second mode, and controls to execute the correcting process according to a determination result of the correction control part, after the job has been finished.

4. The image forming apparatus as claimed in claim 2 , wherein:

the correction control part determines whether to execute a determination as to whether the execution request to execute the correcting process for image forming that uses only the black toner exists or a determination as to whether the execution request to execute the correcting process for image forming that uses the toners of plural colors exists, according to the setting of the first mode or the second mode, and controls to execute the correcting process according to a determination result of the correction control part, every time when one page of image forming has been finished.

5. The image forming apparatus as claimed in claim 4 , wherein:

the correction control part determines whether the execution request to execute the correcting process for image forming that uses the toners of plural colors exists, in a case where a printing job is a printing job using the toners of plural colors, even in a case where the second mode has been set.

6. The image forming apparatus as claimed in claim 5 , wherein:

the correction control part determines whether the execution request to execute the correcting process for image forming that uses only the black toner exists, in a case where the second mode has been set or an inhibition mode to inhibit image forming that uses the toner of plural colors has been set.

7. The image forming apparatus as claimed in claim 2 , wherein:

the correction control part cancels the execution request to execute the correcting process for image forming that uses the toners of plural colors and the execution request to execute the correcting process for image forming that uses only the black toner in a case where the correcting process for image forming that uses the toners of plural colors has been executed, and cancels only the execution request to execute the correcting process for image forming that uses only the black toner in a case where the correcting process for image forming that uses only the black toner has been executed.

8. A correction control method, in an image forming apparatus for which a first mode for executing image forming that uses toners of plural colors including a black toner and a second mode for executing image forming that uses only the black toner can be set, the correction control method comprising:

a first printing cumulatively counting step of cumulatively counting a first number of pages for which image forming has been executed by using the toners of plural colors;

a first printing determining step of determining whether the first number of pages counted in the first printing cumulatively counting step has exceeded a threshold; and

a controlling step of controlling not to execute a correcting process for image forming that uses the toners of plural colors , and controlling to execute a correcting process for image forming that uses only the black toner, when the second mode has been set in a case where it has been determined in the first printing determining step that the first number of pages has exceeded the threshold.

9. A non-transitory computer readable information recording medium embodying a correction control program which, when executed by a computer processor, performs a correction control method in an image forming apparatus for which a first mode for executing image forming that uses toners of plural colors including a black toner and a second mode for executing image forming that uses only the black toner can be set, the correction control method comprising:

a first printing cumulatively counting step of cumulatively counting a first number of pages for which image forming has been executed by using the toners of plural colors;

a first printing determining step of determining whether the first number of pages counted in the first printing cumulatively counting step has exceeded a threshold; and

a controlling step of controlling not to execute a correcting process for image forming that uses the toner of plural colors , and controlling to execute a correcting process for image forming that uses only the black toner, when the second mode has been set in a case where it has been determined in the first printing determining step that the first number of pages has exceeded the threshold.