Parallelepiped carton forming machine

Parallelepiped carton forming machine characterized in that it includes a load and feed chute for a set of die-cut cardboard pieces folded into a flat shape and laid on said chute perpendicular to the chute plane and parallel one after another, a set of depression suckers that move in horizontal direction between a first position near the exit of said chute and suitable for the engagement of the suckers with one of the two coplanar adjacent sides of the nearest die-cut cardboard and a second position suitable for moving the engaged side of the sucker away from the opposite side of the die-cut cardboard and with the simultaneous rotation of the other two sides of the die-cut cardboard for subsequent disposition of the die-cut cardboard in condition of partial opening with open flaps, squaring means for completing the opening and for squaring out the partially open die-cut cardboard, first flap closing means for the closing fold of first bottom flaps connected with said other two sides of the die-cut cardboard and second flap closing means for the closing fold of second bottom flaps connected with the side engaged the suckers and the opposite side of the die-cut cardboard wherein said second flap closing means comprise two second flap closing mechanisms, each mechanism comprising:

• a guide mounted for pivotal movement about a fixed axis;
• a pivot arm pivotable about a second axis;
• a blade pivotally connected to said pivot arm and mounted for sliding movement along said guide and for pivotal movement relative to one end of said pivot arm;
• and
• drive means coupled to said pivot arm for rotating said pivot arm in order to move said blade between a vertical rest position and a horizontal work position by displacing said one end of said pivot arm over a circular path, rotating said blade over a circular path and simultaneously sliding said blade along said guides.