Patent ID: 8740213

Claim:
An image forming apparatus for performing a job for feeding a recording sheet from one of a plurality of sheet storage units and forming an image on the fed recording sheet, the image forming apparatus comprising: a first designation unit configured to designate vertical and lateral lengths of a recording sheet for a first sheet storage unit among the plurality of sheet storage units; a second designation unit configured to designate a predetermined sheet size for a second sheet storage unit among the plurality of sheet storage units, vertical and lateral lengths of the predetermined sheet size being not specified before feeding the recording sheet; and a sheet feed control unit configured to cause a sheet feeding source to: change, in a case where an amount of sheets stored in the first sheet storage unit reaches a first predetermined amount while the job is performed using the first sheet storage unit, from the first sheet storage unit to another sheet storage unit; and not change, in a case where an amount of sheets stored in the second sheet storage unit reaches a second predetermined amount while the job is performed using the second sheet storage unit, from the second sheet storage unit to another sheet storage unit.