Patent ID: 8792132

Claim:
An image forming apparatus comprising: a forming unit configured to form a mark for image adjustment; a conveyor member configured to convey the mark formed by the forming unit; a sensor configured to detect the mark conveyed by the conveyor member; a conveyor member cleaner configured to remove the mark from the conveyor member; and a controller configured to: adjust an image formation process based on an output of the detection performed by the sensor; control the forming unit to form the mark on a portion of the conveyor member; determine a blank area of the conveyor member, the blank area comprising the portion when the mark is removed from the portion; determine whether a length of the blank area is greater than a length of a sheet to be used for printing; and control the forming unit to start printing of the print data when the blank area is facing the forming unit, in response to the controller determining that the length of the blank area is greater than the length of the sheet regardless whether the conveyor member cleaner completes removal of the mark.