Patent ID: 9083836
Filing Date: 2015-07-14
Classification: H04N

Abstract:
1. An image forming apparatus, comprising: a body having an image forming unit; the image forming unit being configured to form an image on a sheet; a sheet detector positioned on a sheet conveyance path at an upstream side of the image forming unit; a conveyance belt configured to convey the sheet; an image detector configured to detect an image formed on the conveyance belt; and a controller, wherein the controller is configured to perform: detecting a front end of the sheet by the sheet detector; forming a mark image to extend over the conveyance belt and the sheet conveyed by the conveyance belt; detecting the mark image on the conveyance belt by the image detector; measuring a mark conveyance time which is a time elapsed after a front end of the sheet is detected by the sheet detector until a rear end of the mark image is detected by the image detector; obtaining a time elapsed based on the mark conveyance time; and forming the image by the image forming unit, when the obtained time passes from the front end of the sheet is detected by the sheet detect.