Method and device for assembling paper box

A device for assembling a box having front, rear, left and right outer wall members connected to a square box bottom panel through pairs of first and second parallel fold lines, front, rear, left and right inner wall members connected to a square box bottom panel through pairs of third and fourth parallel fold lines, and side-panel connecting members connected to the respective side end portions of the adjoining outer wall members and provided on their intermediate portions with diagonal inward fold lines, comprising:

• a first folding station for allowing said left and right inner wall members to be folded back inwardly along said fourth fold line and adhered to said left and right outer wall members through a first adhesive layer formed beforehand,
• a second folding station for allowing said left and right outer wall members to be folded back inwardly along said second fold line, folded up so as to overlap left and right peripheral edge portions of said box bottom panel and allowing said side-panel connecting members formed at the four corners thereof to be fold back inwardly along connecting fold lines extending from said second fold line and adhered to the left and right peripheral edge portions of said front and rear outer wall members corresponding to said side-panel connecting members formed at the four corners through a second adhesive layer formed beforehand,
• a third folding station for allowing said front and rear inner wall members to be folded inwardly along said third fold line and adhered to said front and rear outer wall members through said third adhesive layer formed beforehand,
• said first to third folding stations being each provided with fixed stands for allowing said box to be placed thereon and a pair of interfolding mechanisms having interfolding means for folding said outer or inner wall members inwardly, said interfolding means being disposed on both sides of said fixed stands to fold inward said outer wall members or inner wall members of said box placed on said fixed stands, while being in contact with said outer wall members or inner wall members, and a driving source for driving said interfolding means, and a flexible sheet having its base secured along the side portions of said fixed stands, said interfolding means being secured on the front side of said flexible sheet and being arranged so as to operate guide members by moving vertically lifting rods connected to said interfolding means through a link member,
• said first and third folding stations each having a pair of said guide members each being longer than the longitudinal length of said box, said guide member being supported directing forwardly at the rear side in relation to the forwarding direction of said box with a minute clearance formed on said fixed stands, said minute clearance having both outer side end portions between which a distance substantially equal to a distance between said fold lines.