Sheet feed apparatus and sheet feed method

A sheet feed method comprising:

• loading a plurality of sheets on a sheet feed tray;
• feeding the loaded sheets into an apparatus using a sheet feed roller which is provided at a forward position of the sheet feed tray in a sheet feed direction;
• detecting whether a lift of a bound sheet bundle occurs using a lift detection sensor, the lift occurring when a top sheet of the bound sheet bundle is fed by the sheet feed roller or when one or more sheets are lifted from the sheet feed tray by a user;
• and
• controlling a start and stop of sheet feeding of the sheets loaded in the sheet feed tray, wherein the sheet feeding is stopped if the lift detection sensor detects the lift during a period after starting the sheet feeding, and the sheet feeding is not stopped if the lift is detected after the period.

A color erasing apparatus comprising:

• a sheet feed tray on which a plurality of sheets is loaded;
• a sheet feed roller which is provided at a forward position of the sheet feed tray in a sheet feed direction, and which feeds the loaded sheets to a conveying path;
• a lift detection sensor which detects a lift of a bound sheet bundle which occurs when a top sheet of the bound sheet bundle is fed by the sheet feed roller or when one or more sheets are lifted from the sheet feed tray by a user;
• a control unit which controls a start and stop of sheet feeding of the sheets loaded in the sheet feed tray, and
• a color erasing unit which erases an image on a sheet fed by the sheet feed roller,
• wherein the control unit stops the sheet feeding if the lift detection sensor detects the lift during a period after starting the sheet feeding, and does not stop the sheet feeding if the lift is detected after the period.