Packing box folding system

A packing box folding system, in which a packing box is folded as surfaces of the packing box are overlapped by in contact with each other, the packing box having a rectangular parallelepiped shape and including upper and lower surfaces opposite to each other and respectively opened by unfolding upper panels and lower panels, the system comprising:

• a transport conveyor on which the packing box is loaded and which transports the packing box from a position where the packing box is introduced to a position where the folded packing box is discharged;
• a fixed guide panel which extends between the position where the packing box is introduced to the position where the folded packing box is discharged, is disposed on one side of the transport conveyor in a width direction, and is able to come into contact with two side surfaces of the packing box, which are adjacent to each other;
• a movable suction device which is disposed opposite to the fixed guide panel in the width direction of the transport conveyor, is movable between the position where the packing box is introduced and the position where the packing box is discharged, suctions side surfaces which are opposite to the side surfaces of the packing box, in contact with the fixed guide panel, and presses the suctioned side surfaces inward the width direction;
• a first pressing device which is disposed between both end portions of the fixed guide panel in a transport direction of the transport conveyor, and obliquely presses the side surface placed downstream among the side surfaces of the packing box, in contact with the fixed guide panel, inward the width direction and upstream in the transport direction;
• and
• a second pressing device which is disposed downstream of the first pressing device in the transport direction of the transport conveyor, and presses the surface of the packing box, in contact with the fixed guide panel, inward the width direction,
• wherein the fixed guide panel includes a first surface extending parallel to a side surface parallel to the transport direction of the transport conveyor, among the two side surfaces of the packing box, adjacent to each other, and a second surface placed downstream of the first surface and extending obliquely inward the width direction with respect to the transport direction,
• the packing box is introduced into the transport conveyor and one side surface of the packing box, placed parallel to the transport direction, comes into contact with the first surface of the fixed guide panel, and
• as the movable suction device suctions the side surfaces of the packing box and presses the suctioned side surfaces of the packing box inward the width direction, while being moved downstream, among the side surfaces of the packing box, placed downstream perpendicular to the transport direction, the side surfaces of the packing box, adjacent and perpendicular to each other, are unfolded, and the side surfaces of the packing box, opposite to each other, come into contact with and overlap each other, by being pressed by the first pressing device, the second pressing device and the movable suction device.