Patent ID: 8113505

Claim:
An image forming apparatus, comprising: a main body configured to support a printing device therein; a printing media feeding cassette detachably mounted to the main body, the printing media feeding cassette being configured to support one or more printing media therein; a pickup roller configured to pick up a printing medium from the printing media feeding cassette; and a multi-sheet feeding prevention unit configured to impart a pressing force on the pickup roller when the multi-sheet feeding prevention unit is in a contact position and to release the pressing force to the pickup roller when the multi-sheet feeding prevention unit is in a releasing position, the multi-sheet feeding prevention unit being in the contact position when the printing media feeding cassette is mounted to the main body and being in the releasing position when the printing media feeding cassette is at least partially detached from the main body, wherein the multi-sheet feeding prevention unit comprises: a holder including a supporting arm extending from a rotation shaft and having a multi-sheet feeding prevention member facing the pickup roller and an operating arm to drive the supporting arm; and an elastic member positioned between the operating arm and the printing media feeding cassette.