Patent ID: 8113506

Claim:
A sheet supply apparatus, comprising: a print medium storage device for storing a print medium, said print medium storage device including, a guide member for guiding the print medium thus stored; an engaging portion for engaging the guide member at a specific position; an engaged portion for engaging the engaging portion; and an operation portion disposed to be movable for separating the engaging portion from the engaged portion; and an abutting portion for abutting against the operation portion to move the operation portion so that the engaged portion is disengaged from the engaging portion when the print medium storage device is inserted into the sheet supply apparatus and situated at a first position, and for separating from the operation portion so that the engaged portion engages the engaging portion when the print medium storage device is situated at a second position after the print medium storage device is inserted into the sheet supply apparatus, wherein said engaging portion includes an engaging claw, and said engaged portion includes an engaging groove group, and said engaging claw and said engaging groove group are arranged in at least n stages, said engaging groove group in an n-th stage being arranged away from the engaging groove group in a first stage by a distance equal to 1/n of a minimum itch of the engaging groove group in the first stage.