Cassette for automated teller machine

A cassette for an automatic teller machine (ATM), removably connected to a cassette receiving portion placed at a main body of the ATM, the cassette comprising:

• a cassette body connected and separated with respect to the cassette receiving portion and configured to receive a paper medium, including an entrance disposed at one side for entry of the paper medium;
• a movable shutter placed at the cassette body to open and close the entrance according to connection and separation of the cassette body with respect to the cassette receiving portion;
• a movable first medium support portion placed in the cassette body to push the paper medium toward the entrance;
• a movable second medium support portion movably placed at the entrance so that the paper medium is disposed between the first medium support portion and the second medium support portion;
• a movable connection portion connected to each of opposite ends of the second medium support portion and placed at opposite lateral sides of the cassette body;
• and
• a rotatable medium return gear portion placed at each of the opposite lateral sides of the cassette body so as to be connected to a connection portion gear connected to the connection portion and to a shutter gear placed at the shutter, the medium return gear portion configured to forcibly move the connection portion in a first direction away from the entrance by a moving force of the shutter when the entrance is closed.