Sheet processing apparatus and method for controlling sheet processing apparatus

A method for controlling a sheet processing apparatus including a plurality of sheet storing units and a puncher configured to punch holes in a first sheet conveyed from one of the sheet storing units, the method comprising:

• discharging the first sheet having the holes punched by the puncher and a second sheet conveyed from other of the plurality of sheet storing unit, the second sheet being a pre-punched sheet;
• acquiring a number of holes of the second sheet;
• acquiring a number of holes of the first sheet to be punched by the puncher;
• determining whether the acquired number of holes of the second sheet coincides with the acquired number of holes of the first sheet to be punched;
• and
• displaying a predetermined warning in a case where it is determined that the acquired number of holes of the second sheet does not coincide with the acquired number of holes of the first sheet to be punched.

An image forming apparatus comprising:

• a first feeder configured to feed a first sheet;
• a second feeder configured to feed a second sheet, the second sheet being a pre-punched sheet;
• a printer configured to print an image on the first sheet fed by the first feeder;
• a puncher configured to punch holes in the first sheet on which the image is printed by the printer;
• a discharge roller configured to discharge the first sheet having the holes punched by the puncher and the second sheet fed by the second feeder;
• a processor;
• and
• a memory storing instructions which, when executed by the processor, cause the sheet processing apparatus to:
• acquire a number of holes of the second sheet to be fed by the second feeder;
• acquire a number of holes of the first sheet to be punched by the puncher;
• determine whether the acquired number of holes of the second sheet coincides with the acquired number of holes of the first sheet to be punched;
• and
• display a warning in a case where the acquired number of holes of the second sheet does not coincide with the acquired number of holes of the first sheet to be punched,
• wherein, in a case where the acquired number of holes of the second sheet coincides with the acquired number of holes of the first sheet to be punched, the first sheet and the second sheet are discharged by the discharged roller.