Opening cutter assembly for having opening perforation line on plastic packaging film

An opening cutter assembly of a rolling mechanism for forming an opening perforation line on a plastic packaging film against an anvil roll as the plastic packaging film is fed through the rolling mechanism, the opening cutter assembly comprising:

• an opening cutter shaft having at least one containing compartment recessed into an outer surface thereof, the containing compartment defining a side wall portion peripherally enclosing a floor portion at all sides;
• at least one opening cutter seat nested within said containing compartment and disposed in a height adjustable manner on the floor portion within the containing compartment, the opening cutter seat being releasably coupled to the opening cutter shaft by a cutter seat mounting mechanism, wherein the opening cutter seat is set adjacent to the anvil roll;
• an adjustment mechanism coupled to said opening cutter seat and bearing against said floor portion for maintaining said opening cutter seat in fixed relation to said floor portion when said height is being adjusted;
• and
• at least one opening cutter blade mounted to an upper surface of each opening cutter seat.