Patent ID: 7457580

Claim:
A sheet supplying device comprising: a main body; an engaging member provided on said main body; a sheet placing member on which printing sheets are placed, said sheet placing member being supported by said main body so that said sheet placing member is able to move upward and downward; a feeding unit supported by said main body, said feeding unit being shiftable in accordance with an amount of printing sheets placed on said sheet placing member, said feeding unit contacting and feeding said printing sheet out of said sheet placing member; an urging member supported by said main body, said urging member resiliently urging said sheet placing member toward said feeding unit; a first rotating unit that engages said engaging member provided on said main body and moves according to the movement of said sheet placing member while rotating; a second rotating unit that contacts said first rotating unit and rotates so that said first rotating unit in contact with said second rotating unit moves around said second rotating unit while rotating; a restricting unit movably supported by said main body, said restricting unit being configured to restrict the movement of said first rotating unit by stopping the rotation of said second rotating unit, and allows the movement of said first rotating unit by allowing the rotation of said second rotating unit in accordance with a shifting of said feeding unit; and a movement control unit that controls the movement of said restricting unit, wherein said sheet placing member moves upward when said restricting unit releases the restriction of the movement of said first rotating unit, and stops moving upward when said restricting unit restricts the movement of said first rotating unit.