Image forming apparatus that detects an image on a sheet while sheet conveyance is stopped

An image forming apparatus comprising:

• an image forming unit configured to form an image on a sheet;
• a reversing unit configured to convey a sheet conveyed from the image forming unit in a first direction, stop the conveyance, and then convey the sheet in a second direction, which is opposite to the first direction;
• an image detection unit disposed to detect at least a portion of the image on the sheet stopped by the reversing unit;
• a control unit configured to control the reversing unit and the image detection unit;
• a guide unit;
• and
• a pressing unit,
• wherein the image detection unit includes a transmissive unit that allows light to pass through and irradiate the sheet,
• wherein the guide unit is configured to form a conveyance path to guide the sheet conveyed by the reversing unit and expose the transmissive unit to the conveyance path,
• wherein the pressing unit is configured to press the sheet against the transmissive unit,
• wherein the control unit is configured to detect the image on the sheet with the image detection unit while the sheet conveyance is stopped by the reversing unit.

An image forming apparatus comprising:

• an image forming unit configured to form an image on a sheet;
• a conveyance unit configured to convey the sheet on which an image has been formed in the image forming unit and stop the sheet conveyance;
• an image detection unit configured to detect the image on the sheet;
• and
• a control unit configured to control the conveyance unit and the image detection unit,
• wherein the control unit is configured to detect at least a portion of the image on the sheet with the image detection unit while the sheet conveyance is stopped by the conveyance unit,
• wherein the image detection unit is disposed to detect an area including an edge of the sheet stopped by the conveyance unit and an edge of the image on the sheet, and
• wherein the control unit is configured to acquire a position of the edge of the sheet and a position of the edge of the image formed on the sheet from a detection result from the image detection unit.