Method and apparatus for automatic precision cutting of graphics areas from sheets

  • US 6,619,168 B2
  • Filed: 09/13/2001
  • Issued: 09/16/2003
  • Est. Priority Date: 04/05/2001
  • Status: Expired due to Term
First Claim
Patent Images

1. In a method for cutting a graphics area including graphics from a sheet of material bearing such graphics area and a plurality of registration marks in predetermined positions with respect thereto at the time the graphics are applied, a subset of the marks being initial-position/orientation-determining marks on no more than one side of the graphics area, the method being of a type including (a) placing the sheet of material on a sheet-receiving surface, (b) sensing the subset in a field of view of a main sensor to determine a position and orientation of the sheet of material and approximate positions of the plurality of registration marks at the time of cutting, (c) sensing precise positions of the marks, and (d) cutting the graphics area from the sheet of material in response to the precise positions of the marks with respect to the graphics area at that time, the improvement comprising:

  • if the subset is not in an expected location, automatically determining a coordinate region of the subset on the sheet-receiving surface; and

    in response to determining the coordinate region of the subset, automatically repositioning the main sensor to the coordinate region such that the subset is within the field of view of the main sensor whereby cutting occurs precisely despite two-dimensional distortion of the sheet of material prior to cutting.

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