Box packing device

A box packing device comprising:

• a dropping part having an upper guide mechanism and a lower guide mechanism which is arranged below the upper guide mechanism, the dropping part being configured to drop a box, the box having four side faces that define a side face portion, each of the four side faces having a corresponding tabular lid portion extending therefrom, one of the four side faces is directed downward and an upper lid portion extending from an upper side face among the four tabular lid portions and a first lateral lid portion and a second lateral lid portion extending from laterally positioned side faces among the four tabular lid portions are opened outward as the height position of the box is changed:
• and
• a first drive unit, wherein
• the upper guide mechanism includes a first guide portion arranged so as to oppose front faces of the first and second lateral lid portions when the box is dropped, and a second guide portion arranged so as to oppose rear faces of the first and second lateral lid portions when the box is dropped, and
• the lower guide mechanism includes a third guide portion arranged so as to oppose the front faces of the first and second lateral lid portions when the box is dropped and after the box is dropped, a fourth guide portion arranged so as to oppose the rear faces of the first and second lateral lid portions when the box is dropped and after the box is dropped, and the first drive unit drives at least one of the third guide portion and the fourth guide portion toward the other of the third guide portion and the fourth guide portion after the box is dropped.