Patent ID: 7357057

Claim:
A paper cutter comprising a base, a rail, a slide unit, a cutter seat and at least two blades, said base being provided with said rail for said slide unit to slide thereon, said cutter seat being rotatably coupled to said slide unit, said cutter seat being provided with said blades, and characterized by: said cutter seat rotating around said rail and said slide unit comprising a one-way locking member, said cutter seat having ratchet teeth formed on a periphery thereof defining a plurality of locking edges for engagement with said locking member for one-way engagement of said locking member with one of said locking edges, said cutter seat being positioned with respect to said slide unit whereby turning said cutter seat rotationally in a first direction, permits said blades to be displaced to an exchangeable, and the plane including the rotational axes of said blades is perpendicular to said rail axis position; and, a biasing element coupling said one-way locking member to said slide unit for providing an engagement force between said one way locking unit and one of said locking edges to prevent rotation of said cutter seat in a second direction rotationally opposite to said first direction.