Image forming apparatus, image formation system and recording medium

1. An image forming apparatus comprising:

a transfer belt;

an image forming section configured to form a toner image on the transfer belt;

a first cleaning section configured to perform cleaning for removing toner on the transfer belt;

a second cleaning section having a cleaning performance greater than a cleaning performance of the first cleaning section, and configured to perform cleaning for removing the toner on the transfer belt at a position on an upstream side of the first cleaning section in a movement direction of the transfer belt;

a determination section configured to determine a necessity of formation of a high-coverage patch having a coverage exceeding a limit of the cleaning performance of the first cleaning section on a basis of job information relating to a print job;

an image formation control section configured to control the image forming section to form the high-coverage patch on the transfer belt when formation of the high-coverage patch is necessary; and

a cleaning control section configured to control the second cleaning section to execute the cleaning at a time when the high-coverage patch on the transfer belt passes over a position of the second cleaning section.

2. The image forming apparatus according to claim 1 , wherein the job information used for determination of the determination section includes information on whether a sheet used in the print job is a continuous sheet, and information on whether a coverage rate in the print job is lower than a predetermined value.

3. The image forming apparatus according to claim 1 , wherein:

the high-coverage patch includes a high-coverage part having a coverage exceeding the limit of the cleaning performance of the first cleaning section, and a low-coverage part located at a front end and a rear end of the high-coverage part and having a coverage equal to or lower than the limit of the cleaning performance of the first cleaning section; and

the cleaning control section starts the cleaning of the second cleaning section at a timing when the low-coverage part located at the front end passes over the position of the second cleaning section, and stops the cleaning of the second cleaning section at a timing when the low-coverage part located at the rear end passes over the position of the second cleaning section.

4. The image forming apparatus according to claim 1 , wherein

each of the first cleaning section and the second cleaning section includes a blade, and

the blade of the second cleaning section makes contact with the transfer belt with a contact angle and/or a contact force greater than a contact angle and/or a contact force of the blade of the first cleaning section.

5. The image forming apparatus according to claim 1 , wherein

each of the first cleaning section and the second cleaning section includes a blade, and

the blade of the second cleaning section has a width smaller than a width of the blade of the first cleaning section.

6. An image formation system comprising:

a sheet feeding apparatus configured to feed a roll sheet;

the image forming apparatus according to claim 1 ; and

a winding apparatus configured to wind up the roll sheet on which the toner image is formed by the image forming apparatus.

7. A non-transitory computer-readable recording medium storing a program of an image forming apparatus, the image forming apparatus including:

a transfer belt;

an image forming section configured to form a toner image on the transfer belt;

a first cleaning section configured to perform cleaning for removing toner on the transfer belt; and

a second cleaning section having a cleaning performance greater than a cleaning performance of the first cleaning section, and configured to perform cleaning for removing the toner on the transfer belt at a position on an upstream side of the first cleaning section in a movement direction of the transfer belt,

the program being configured to cause a computer of the image forming apparatus to execute processing, the processing comprising:

determining a necessity of formation of a high-coverage patch having a coverage exceeding a limit of the cleaning performance of the first cleaning section on a basis of job information relating to a print job;

controlling the image forming section to form the high-coverage patch on the transfer belt when formation of the high-coverage patch is necessary; and

controlling the second cleaning section to execute the cleaning at a time when the high-coverage patch on the transfer belt passes over a position of the second cleaning section.

8. The non-transitory computer-readable recording medium according to claim 7 , wherein the job information includes information on whether a sheet used in the print job is a continuous sheet, and information on whether a coverage rate in the print job is lower than a predetermined value.

9. The non-transitory computer-readable recording medium according to claim 7 , wherein:

the high-coverage patch includes a high-coverage part having a coverage exceeding the limit of the cleaning performance of the first cleaning section, and a low-coverage part located at a front end and a rear end of the high-coverage part and having a coverage equal to or lower than the limit of the cleaning performance of the first cleaning section; and

the computer of the image forming apparatus is caused to execute processing including starting the cleaning of the second cleaning section at a timing when the low-coverage part located at the front end passes over the position of the second cleaning section, and stopping the cleaning of the second cleaning section at a timing when the low-coverage part located at the rear end passes over the position of the second cleaning section.