Patent ID: 7043191

Claim:
An image forming apparatus comprising: a sheet storing unit for storing a plurality of sheets layered one upon another; an elevation/lowering driving unit for elevating/lowering the sheet storing unit; a sheet conveying unit for taking out sheets one by one from a topmost layer that is brought into contact with the sheet conveying unit by elevating the sheet storing unit with the elevation/lowering driving unit and conveying the sheets to a predetermined conveyance path; a regulating unit, mounted slidably with respect to the sheet storing unit, for regulating a mount position of sheets; a position detector for detecting a position of the regulating unit; a controller capable of controlling an elevation/lowering movement of the sheet storing unit caused by the elevation/lowering driving unit on the basis of a detection result of the position detector; an image forming unit for forming an image on a sheet conveyed by the sheet conveying unit; and a storing unit for storing standard sized sheet information; wherein the controller is capable of performing further operations of: measuring dimensions of a sheet stored in the sheet storing unit on the basis of a detection result of the position detector; judging whether or not the sheet corresponds to the standard sized sheet information stored in the storing unit, on the basis of the measured dimensions; and controlling the elevation/lowering driving unit to elevate the sheet storing unit when it is judged that the sheet corresponds to the standard sized sheet information.