Medium transport apparatus and postprocessing apparatus

A postprocessing apparatus, comprising:

• a transport mechanism that transports a medium;
• an intermediate stacker that stacks the medium transported by the transport mechanism;
• and
• a postprocessing mechanism that performs postprocessing on the medium that is stacked in the intermediate stacker, wherein
• the transport mechanism includes
• a transport belt in which a plurality of holes are formed and that has a loop shape and is transported in a first transporting direction and in a second transporting direction that is opposite to the first transporting direction,
• a suction clinging mechanism that includes an opening of a first suction chamber and an opening of a second suction chamber that is located upstream of the opening of the first suction chamber in the first transporting direction, the opening of the first suction chamber and the opening of the second suction chamber drawing air through the holes, the suction clinging mechanism thereby cling the medium to the transport belt, and
• a rotation mechanism that moves the transport belt in the first transporting direction by rotating in a first rotating direction and that moves the transport belt in the second transporting direction by rotating in a second rotating direction that is opposite to the first rotating direction and thereby moves the transport belt in the second transporting direction,
• the transport mechanism transports the medium in the first transporting direction and after an upstream edge of the medium in the first transporting direction is transported to a switching position, the transport mechanism transports the medium in the second transporting direction and stacks the medium in the intermediate stacker, and
• the switching position is located upstream of the opening of the first suction chamber in the first transporting direction, and a distance from the switching position to the opening of the first suction chamber in the first transporting direction is longer than a length of each of the holes in the first transporting direction.