Sheet storage device and image formation system including same

A sheet storage device comprising:

• a setting plate on which a sheet is set, the setting plate being capable of reciprocating in an up and down direction;
• a pair of frames disposed to face each other with the setting plate between them, the pair of frames each being a plate, in a first direction perpendicular to the up and down direction:
• wires linked with both end parts of the setting plate in the first direction;
• a plurality of winding drums disposed outward of each of the pair of frames in the first direction, so as to be linked with the wires and be rotatable about an axis extending in the first direction, the winding drums being rotated in one direction so as to wind the wires and move the setting plate upward, while being rotated in the other direction so as to unwind the wires and move the setting plate downward;
• and
• a plurality of relay pulleys disposed outward of each of the pair of frames in the first direction, in a rotatable manner about an axis extending in the first direction, the wires being wrapped around the relay pulleys, wherein
• a predetermined frame out of the pair of frames includes a main frame part, and a drum arrangement part positioned on one side of the main frame part in a second direction perpendicular to the first direction,
• the wires include a first wire linked with one side end part of the setting plate in the second direction, on a predetermined frame side, and a second wire linked with the other side end part of the setting plate in the second direction, on the predetermined frame side,
• the winding drums on the predetermined frame side out of the plurality of winding drums are disposed in the drum arrangement part,
• the relay pulleys on the predetermined frame side out of the plurality of relay pulleys include a first relay pulley disposed in the drum arrangement part, for the first wire to wrap around, a second relay pulley disposed on the same axis as the first relay pulley, outward of the first relay pulley in the first direction, for the second wire to wrap around, and a third relay pulley disposed in the main frame part, for the second wire to wrap around,
• the drum arrangement part is positioned inward of the main frame part in the first direction,
• the winding drums on the predetermined frame side include a first winding drum linked with the first wire, and a second winding drum disposed on the same axis as the first winding drum, outward of the first winding drum in the first direction, so as to be linked with the second wire, and
• a distance between the main frame part and the drum arrangement part in the first direction is more than or equal to a width of the first winding drum in the first direction.