Patent ID: 8811844

Claim:
An image forming device configured to transfer an image formed on at least one photosensitive body to a sheet-like medium by using the at least one photosensitive body and a transfer belt provided to face the at least one photosensitive body, the image forming device comprising: a recovering member provided for the at least one photosensitive body and configured to recover adhered substances adhered to the at least one photosensitive body; a belt cleaner configured to remove the adhered substances adhered to the transfer belt; a processor; and memory storing computer readable instructions that, when executed by the processor, cause the image forming device to provide: a cleaning process execution unit configured to execute a cleaning process in which the adhered substances are transferred from the recovering member to the transfer belt via the at least one photosensitive body, by controlling the at least one photosensitive body, the transfer belt and the recovering member; a use amount calculation unit configured to divide a developer image, to be transferred to the sheet-like medium, into a plurality of areas and to calculate a separate developer use amount in each of the plurality of areas, wherein the plurality of areas are defined by dividing the developer image only in a main scanning direction; and a cleaning time determination unit configured to determine a duration of execution of the cleaning process, based on a maximum value of the developer use amounts of the plurality of areas calculated by the use amount calculation unit.