Medium transport apparatus

A medium transport apparatus comprising:

• an apparatus main body in which a medium is transported;
• a door coupled to the apparatus main body and configured to rotate about a rotation axis and switch between an open state and a closed state;
• a plurality of rotating bodies configured to be away from each other in the open state and to be in contact with each other and transmit a drive force in the closed state;
• and
• a lock mechanism section that locks the door against the apparatus main body to bring the door into the closed state and unlocks the door from the apparatus main body to bring the door into the open state, wherein
• the lock mechanism section includes
• a counter-engagement portion extending in a first direction,
• an engagement portion having an engagement surface configured to change in position between a first posture and a second posture in a second direction intersecting with the first direction and engage with the counter-engagement portion, and
• an application member that applies a force to the engagement portion to enable the engagement surface to change in position from the first posture to the second posture,
• in a closing operation of the door, the engagement surface changes in position from the first posture to the second posture while shifting a position of contact with the counter-engagement portion, and
• in the closing operation and in the closed state, the engagement surface applies, to the counter-engagement portion, a pull-in force for moving the door to a closed position,
• the engagement portion has a central axis of rotation relative to the door,
• the central axis of rotation and the counter-engagement portion overlap in the closed state, when seen in the second direction.

A medium transport apparatus comprising:

• an apparatus main body in which a medium is transported;
• an outer door;
• an inner door disposed inward of the outer door, the inner door being coupled to the apparatus main body and configured to rotate about a rotation axis and switch between an open state and a closed state;
• a plurality of rotating bodies configured to be away from each other in the open state and to be in meshing contact with each other and transmit a drive force in the closed state;
• and
• a lock mechanism section that locks the inner door against the apparatus main body to bring the inner door into the closed state and unlocks the inner door from the apparatus main body to bring the inner door into the open state, wherein
• the lock mechanism section includes
• a counter-engagement portion extending in a first direction,
• an engagement portion having an engagement surface configured to change in position between a first posture and a second posture in a second direction intersecting with the first direction and engage with the counter-engagement portion, the engagement portion further comprises a front wall portion restricting clockwise rotation of the engagement portion and a rear wall portion restricting counterclockwise rotation of the engagement portion, the apparatus main body having an abutting portion configured to abut on the front wall portion and the rear wall portion, and
• an application member that applies a force to the engagement portion to enable the engagement surface to change in position from the first posture to the second posture,
• in a closing operation of the inner door, the engagement surface changes in position from the first posture to the second posture while shifting a position of contact with the counter-engagement portion, and
• in the closing operation and in the closed state, the engagement surface applies, to the counter-engagement portion, a pull-in force for moving the inner door to a closed position.