Patent ID: 6142138
Filing Date: 2000-11-07
Classification: B23D,B27B,B28D,Y10T

Abstract:
A method of aligning cutting lines of a workpiece, which depend on patterns, with a pair of cutting blades provided at a pair of cutting blade units provided with motors for rotating said pair of cutting blades, the alignment being performed when said pair of cutting blade units cuts said workpiece, said alignment method comprising the steps of:registering reference patterns at at least one point of low magnification and one point of high magnification on said workpiece located at a preset position;simultaneously producing images of patterns at two points in proximity to the center of said workpiece with two imaging means provided at said pair of cutting blade units, and aligning said workpiece such that the images of the patterns at said two points can match with said reference patterns; andmoving either one of said two imaging means to a position so as to produce an image of a pattern at one point at the outer circumference of said workpiece and aligning said workpiece such that the image of the pattern at the point at the outer circumference can match with said reference patterns.