Sheet stacking apparatus and image forming apparatus

A sheet stacking apparatus comprising:

• a first storage configured to store sheets;
• a first conveyance portion configured to convey the sheets stored in the first storage;
• a second storage configured to store sheets above the sheets stored in the first storage;
• a second conveyance portion configured to convey the sheets stored in the second storage;
• and
• a main body frame having a first opening portion and a second opening portion, the main body frame being configured to hold the first storage so that the first storage is movable through the first opening portion between a closed position in which the sheets are allowed to be conveyed and a pullout position in which the sheets are allowed to be stacked, and the main body frame being configured to hold the second storage so that the second storage is movable through the second opening portion between a closed position in which the sheets are allowed to be conveyed and a pullout position in which the sheets are allowed to be stacked,
• wherein the second storage is provided with an exterior cover being larger than the second opening portion so as to cover the second opening portion when the second storage is located in the closed position,
• wherein the first conveyance portion includes a rotary member configured to feed a sheet when being rotated while being in contact with the sheet stored in the first storage, and
• wherein the rotary member overlaps the exterior cover of the second storage in a vertical direction when viewed in a horizontal direction.

An image forming apparatus comprising:

• a sheet stacking apparatus;
• and
• an image forming portion configured to form an image on a sheet stacked in the sheet stacking apparatus, the sheet stacking apparatus including:
• a plurality of storages configured to store sheets;
• a plurality of conveyance portions, which are provided above the sheets stored in the plurality of storages, respectively, and are configured to convey the sheets in a conveyance direction;
• and
• a main body frame having a plurality of opening portions, which is configured to hold the plurality of storages so that each of the plurality of storages is movable through a corresponding one of the plurality of opening portions between a closed position in which the sheets are allowed to be conveyed and a pullout position in which the sheets are allowed to be stacked,
• wherein the plurality of storages include a plurality of exterior covers, respectively, each of the exterior covers being larger than a corresponding one of the plurality of opening portions so as to cover the corresponding one of the plurality of opening portions,
• wherein the plurality of storages are arranged so that the plurality of exterior covers are aligned in a vertical direction, and
• wherein a conveyance portions, which conveys the sheets stored in a lower storage of the plurality of storages, overlaps an exterior cover of a storage one above the lower storage in the vertical direction when viewed in a horizontal direction.