Patent ID: 8238766

Claim:
An image forming apparatus comprising: an image forming unit configured to form an image on a recording medium; a transport roller configured to transport a recording medium to the image forming unit; a stacking unit configured to stack a recording medium; a manual feed path configured to extend from a manual feed slot to the transport roller; a feed path configured to extend from the stacking unit to the transport roller; a feed unit configured to transport the recording medium stacked in the stacking unit to the transport roller through the feed path; a first detection unit configured to detect a recording medium inserted into the manual feed path from the manual feed slot; and a control unit configured to: determine whether a succeeding recording medium is stacked on an image forming surface of a preceding recording medium in a case that the first detection unit detects the recording medium inserted into the manual feed path while the recording medium of the stacking unit is in route to the image forming unit; abort the image forming operation by the image forming unit when the control unit determines that a succeeding recording medium is stacked on an image forming surface of a preceding recording medium; determine whether a succeeding recording medium is stacked on a surface of the preceding recording medium that is opposite to the image forming surface of the preceding recording medium in a case that the first detection unit detects the recording medium inserted into the manual feed path while the recording medium of the stacking unit is in route to the image forming unit; and continue the image forming operation when the control unit determines that the succeeding recording medium is stacked on a surface of the preceding recording medium that is opposite to the image forming surface of the preceding recording medium.