Patent ID: 8657511

Claim:
An image forming apparatus, comprising: a body having an opening; and a printing media cassette receivable into the body through the opening, the printing media cassette comprising: a printing media loading plate having a surface on which to support printing media received in the printing media cassette, the printing media loading plate being configured to move into varying positions so as to define varying amounts of the printing media that can be received in the printing media cassette; and a capacity adjustment unit configured to restrict a movement of the printing media loading plate to define at least two locked loading positions of the printing media loading plate, the at least two loading positions of the printing media loading plate being two of the varying positions selected based on a size of the printing media being received in the printing media cassette, wherein the capacity adjustment unit comprises: a guide member movable to define an area on the surface of the printing media loading plate variably based on the size of the printing media being received in the printing media cassette; and a locking member configured to move in association with the guide member to thereby hold the printing media loading plate at the selected loading position, the locking member including a stopper to come into a contact with a portion of the printing media cassette body when the printing media loading plate is positioned at a first locked loading position of the varying positions, and an operating rib extending from the locking member to come into a contact with a portion of the guide member when the printing media loading plate is positioned at a second locked loading position of the varying positions.