Patent ID: 7421221

Claim:
An image forming device comprising: a toner image forming unit that successively forms onto a recording medium a requested toner image of an image requested by a user and a test toner image, where a controller controls the toner image forming unit to form the test toner image; a sheet transfer unit that transfers the recording medium having the requested toner image formed thereon by the toner image forming unit, the sheet transfer unit includes a sheet transferring path from an image fixing position to a sheet exit tray and a sheet reversing path that is branched from a first branch position on the sheet transferring path for reversing the recording medium; an image fixing unit that, at the image fixing position, fixes onto the recording medium at least one of a requested image and a test image based on a corresponding one of the requested toner image and the test toner image; an image detecting unit, disposed downstream from the image fixing unit along the sheet transfer unit and disposed at the downstream side of the sheet exit tray along the sheet transferring path from the first branch position, that detects the test image formed on the recording medium, where the image detecting unit includes a colorimetric sensor disposed at a position facing a surface having an image formed thereon of a recording sheet that is output in a non-reverse manner; a calibration unit that performs a color calibration process based upon the test image detected by the image detecting unit; and a sheet transfer controller that controls the sheet transfer unit so as to inhibit the reversing the recording medium having the test image formed thereon and to discharge the recording medium after a preceding recording medium if a reverse output is designated for a recording medium on which the requested image is to be formed.