Patent ID: 7822360

Claim:
An image forming apparatus comprising: a main body; a roller detachably attached to the main body; a supporting member which supports a rotary shaft of the roller, the supporting member comprising a first bush, in which a side of the rotary shaft is inserted in an axial direction of the roller, and a second bush having an opening, in which another side of the rotary shaft is inserted into in a radial direction of the roller, the first bush and the second bush being elastically biased in a radial direction of the roller so that the roller presses against an opposing medium; and a locking unit, comprising a locker frame fixed on the main body, a locker arm movably coupled to the locker frame which moves between a locking position in which the another side of the rotary shaft is locked on the supporting member and a releasing position where locking of the another side of the rotary shaft is released, a barrier which prevents the another side of the rotary shaft from being ejected from the second bush through the opening when the locker arm is in the locking position, an elastic member which applies an elastic force to the locker arm to return the locker arm to the locking position.