Image forming apparatus

Abstract

An image forming apparatus includes an apparatus main body that carries out an image forming processing with respect to a sheet. A sheet supplying unit is mounted detachably into the apparatus main body and adapted to supply a sheet from a stack of sheets stored therein toward an inside of the apparatus main body. The sheet supplying unit includes a position keeper for keeping the sheet stack in a determined position by contacting sides of the stack. The keeping position is changeable in accordance with the size of a sheet. A lock mechanism locks the position keeper in a keeping position. The locking mechanism releases the locking of the position keeper when the sheet supplying unit is detached from the apparatus main body and placed on a surface. However, the locking mechanism locks the position keeper when the sheet supplying unit is lifted from the surface.

Dependencies are inferred from the claim text.