A case is gripped by its side panel by suction cups mounted on a squaring arm and rotated out of a magazine into contact with a squaring rail, which forces the case into a squared configuration as the case rotates into position between two drive belts, one fixed, and one with a gate-like swinging section which is rotated open. The bottom minor flaps are then closed by minor flap folders as the swinging belt section rotates closed, gripping the case. The drive belts then convey the case out of the squaring area, over flap ploughs which close the bottom major flaps. The squaring arm, fixed drive belt, and rear minor flap folder are mounted to a carrier. The front minor flap folder and major flap ploughs are mounted to a second carrier. The adjustment mechanism of both carriers is coupled to the adjustment mechanism of the magazine height.
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