Patent ID: 9571670
Date: 2017-02-14
CPC Classifications: H04N

Claim:
1. An inspection apparatus having a printing unit configured to print image data on a sheet having been fed by a paper feeding unit and discharge the sheet on which the image data has been printed to a paper output tray and inspecting a sheet on which printing has been performed by the printing unit, the inspection apparatus comprising: a reading unit configured to read the sheet on which printing has been performed and acquire a read image; a first determination unit configured to determine whether there is any printing error in the read image by comparing the read image with a reference image; a second determination unit configured to determine whether, as the printing error determined by the first determination unit, a plurality of printing errors has occurred at a same position with respect to a main scanning direction and whether the plurality of printing errors has occurred periodically in a certain fixed cycle of appearance in a sub-scanning direction; and a control unit configured to control, in a case where the second determination unit determines that the plurality of printing errors determined by the first determination unit has occurred at the same position with respect to the main scanning direction and that the plurality of printing errors has occurred periodically in the certain fixed cycle of appearance in the sub-scanning direction, the printing unit to stop the feeding of a sheet from the paper feeding unit, wherein, in a case where it is determined by the second determination unit that the plurality of printing errors determined by the first determination unit has occurred at the same position with respect to the main scanning direction but not periodically in the certain fixed cycle of appearance in the sub-scanning direction, the control unit controls the printing unit to discharge a sheet from which the read image has been obtained to an escape tray different from the paper output tray and to restart feeding of a sheet from the paper feeding unit.