Inspection apparatus for inspecting image on sheet and image forming system that inspects printed image on sheet

An image forming system comprising:

• an image forming apparatus configured to form an image on a sheet;
• a reading apparatus configured to read the image on the sheet, the reading apparatus including
• a conveyor configured to convey the sheet discharged from the image forming apparatus to a reading position,
• a reading sensor including a plurality of pixels and configured to read the image on the sheet during a passage of the sheet at the reading position, and
• a reference member configured to be read by the reading sensor, a reading result of the reference member by the reading sensor being used for shading correction to correct output of the plurality of pixels;
• an inspection controller configured to inspect the image on the sheet read by the reading apparatus;
• and
• a controller configured to,
• control, in inspection processing where the reading sensor sequentially reads a plurality of sheets and an inspection unit inspects an image formed on each of the plurality of sheets by the image forming apparatus, conveyance of the plurality of sheets to cause each of the plurality of sheets to reach the reading position at a predetermined time interval, and
• set, in a case where the reading sensor reads the reference member during the inspection processing, a time interval from when a first sheet included in the plurality of sheets reaches the reading position to when a second sheet, immediately subsequent to the first sheet, included in the plurality of sheets reaches the reading position to be longer than the predetermined time interval, wherein the reading sensor reads the reference member during a period from when the reading sensor reads an image on the first sheet to when the reading sensor reads an image on the second sheet.