Image processing apparatus

A mechanism for easing transition of a cassette to and from an insertion position and an ejection position from an apparatus body, the mechanism comprising:

• a pin member configured to connect to the cassette in a first direction orthogonal to a longitudinal direction along which the cassette is configured to be inserted or ejected;
• a lever configured to rotate about a rotational axis in the first direction, the lever comprising a first contact surface;
• an elastic member coupled to the lever and configured to exert a rotational force on the lever to bring the pin member into contact with the first contact surface of the lever,
• the pin member being spaced from the rotational axis of the lever;
• a pin engagement portion disposed at a tip end of the lever;
• and
• a guide hole configured to receive the pin member, the pin member being permitted to travel along an edge of the guide hole in a second direction orthogonal to the first direction and the longitudinal direction during a transition between insertion and ejection,
• the guide hole being configured such that a distance between the pin member and the rotational axis of the lever when the transition is ejection to insertion is different than a distance between the pin member and the rotational axis when the transition is from insertion to ejection.