Vibration device, article conveyance device, and article sorting device

A vibration device, comprising:

• a base supported on a ground surface via a vibration isolation spring,
• a movable bench elastically supported with respect to the base,
• a first horizontal excitation unit that vibrates the movable bench in a first horizontal direction,
• a second horizontal excitation unit that vibrates the movable bench in a second horizontal direction that crosses the first horizontal direction,
• a vertical excitation unit that vibrates the movable bench in a vertical direction,
• a first middle bench and a second middle bench between the base and the movable bench,
• a plurality of first horizontal elastic support units,
• a plurality of second horizontal elastic support units, and
• a plurality of vertical elastic support units,
• wherein the plurality of first horizontal elastic support units, the plurality of second horizontal elastic support units, and the plurality of vertical elastic support units collectively elastically connect the base, the first middle bench, the second middle bench, and the movable bench sequentially in the first horizontal direction, the second horizontal direction, and the vertical direction,
• wherein the vibration device is configured such that if overall device is supposed as a first mass body, a second mass body, and a third mass body with the first horizontal elastic support units and the second horizontal elastic support units as boundaries, respective barycentric positions of the first mass body, the second mass body, and the third mass body are almost the same in the vertical direction and horizontal direction;
• and
• wherein the base, the first middle bench, the second middle bench, the first horizontal elastic support unit, the second horizontal elastic support unit, and the vertical elastic support unit are located below said movable bench.