Patent ID: 8353508

Claim:
An image forming apparatus including a sheet feeding cassette which is provided to an apparatus main body and provided with a sheet stacking portion configured to stack sheets thereon, the sheet stacking portion being liftable for a cassette main body, and a sheet feeding portion configured to feed the sheets to be stacked, the image forming apparatus comprising: a lift member configured to push up the sheet stacking portion so that the sheets to be stacked are brought into pressure contact with the sheet feeding portion; a plurality of springs coupled to the lift member, which are set to have one of the same spring constant and spring constants different from each other; a driving mechanism configured to drive the lift member; and a setting mechanism disposed between the lift member and the driving mechanism, and setting a pressure contact force for bringing the sheet to be stacked into pressure contact with the sheet feeding portion by selectively causing the plurality of springs to function with respect to the lift member according to a size of the sheets to be stacked.