Patent ID: 6817276
Filing Date: 2004-11-16
Classification: B26D,B26F,B65D,Y10S,Y10T

Abstract:
An apparatus for forming a tamper indicating closure from a plastic closure having a base wall and a peripheral skirt comprising:a primary cutting knife having an interrupted cutting edge for cutting an interrupted circumferential score, said interrupted circumferential score including circumferentially spaced cuts and a plurality of bridges respectively separating said spaced cuts, said interrupted cutting edge of said primary knife having a cross section with opposed tapered surfaces forming opposite identical angles relative to a plane through the center of said primary cutting knife and intersecting the cutting edge of said knife, first support means for supporting said primary cutting knife in a fixed position for cutting at a first depth into said peripheral skirt, a secondary cutting knife having a continuous cutting edge for cutting a circumferential score, said continuous cutting edge of said secondary knife having a cross section with opposed tapered surfaces forming opposite identical angles relative to a plane through the center of said secondary cutting knife and intersecting the cutting edge of said secondary cutting knife, both said primary cutting knife and said secondary cutting knife having said tapered surfaces adjacent to said cutting edges forming an angle A with the central plane of each knife, and both said tapered surfaces spaced from said cutting edges forming an angle B, less than said angle A, with the central plane of each knife, second support means for supporting said secondary cutting knife in a fixed position for cutting a second depth into said peripheral skirt, said second support means positioning said secondary cutting knife such that said continuous cutting edge is aligned with said interrupted circumferential score, means for moving said plastic closure successively past said primary cutting knife and said secondary cutting knife to initially bring the peripheral skirt of said plastic closure into contact with said interrupted cutting edge of said primary cutting knife to cut said interrupted circumferential score having said plurality of circumferentially spaced bridges, and thereafter to bring said peripheral skirt of said plastic closure into contact with said continuous cutting edge of said secondary cutting knife to cut in and along said interrupted circumferential score to dimension accurately the radial thickness of said bridges, and first adjustment means for variably positioning said primary cutting knife on said first support means, and second adjustment means for variably positioning said secondary cutting knife on said second support means independent of said first adjustment means and said first support means.