Sheet feeding apparatus and image forming apparatus

A sheet feeding apparatus comprising:

• a supporting portion configured to support a plurality of sheets that have been manually set;
• a sheet feeding unit configured to feed the sheets supported by the supporting portion;
• a side edge regulation plate configured to move in a width direction perpendicular to a feed direction, the side edge regulation plate being configured to regulate a position of the sheets supported by the supporting portion in the width direction;
• a separation unit configured to separate the sheets by blowing air onto the plurality of sheets that are supported by the supporting portion;
• a regulation plate position detection unit configured to detect a position of the side edge regulation plate in the width direction;
• and
• a control unit configured to execute a separation mode so as to perform an air-blow operation by the separation unit in feeding the sheets by the sheet feeding unit,
• wherein, in the separation mode,
• in a case where a position of the side edge regulation plate, detected by the regulation plate position detection unit, subsequent to starting the air-blow operation differs from a position of the side edge regulation plate, detected by the regulation plate position detection unit, prior to starting the air-blow operation, the control unit is configured to stop the air-blow operation.