Patent ID: 7980545

Claim:
An image forming apparatus including an image forming unit to form an image on a sheet, the image forming apparatus comprising: a sheet inserting unit configured to inset one or more of a first insertion sheet and a second insertion sheet at one or more predetermined insertion positions in a plurality of sheets, in a case where the plurality of sheets are output by the image forming unit; a control unit configured to control the sheet inserting unit to prevent the sheet inserting unit from inserting both the first insertion sheet and the second insertion sheet at the same predetermined insertion position in the plurality of sheets; and a first determining unit configured to determine whether an image is formed on the first insertion sheet by the image forming unit, wherein the control unit is configured to permit the sheet inserting unit to insert the first insertion sheet and the second insertion sheet at the same predetermined insertion position in the plurality of sheets, in a case where the first determining unit determines that the image is formed on the first insertion sheet, and prevent the sheet inserting unit from inserting the first insertion sheet and the second insertion sheet at the same predetermined insertion position in the plurality of sheets, in a case where the first determining unit determines that the image is not formed on the first insertion sheet.