Apparatus and method for determining contour characteristics of a contoured article

• US 4,679,331 A
• Filed: 08/26/1985
• Issued: 07/14/1987
• Est. Priority Date: 08/26/1985
• Status: Expired due to Fees

• Current Assignee: PPG Industries Incorporated (Nouryon BV)
• Original Assignee: PPG Industries Incorporated (Nouryon BV)
• Inventors: Koontz, Harry S.
• Primary Examiner(s): Martin, Jr., William D.
• Application Number:
  US06/768,384
• Time in Patent Office: 687 Days
• Field of Search: 33/551, 33/504, 33/1 CC, 33/1 M, 33/503, 33/553
• US Class Current: 33/551
• CPC Class Codes: G01B 5/20 for measuring contours or curvatures
• CPC Class Codes: G01B 7/004 for measuring coordinates of points
• CPC Class Codes: G01B 7/28 for measuring contours or curvatures

Abstract

An inspection apparatus includes a checking fixture having an article supporting surface having a contour representative of the desired/ideal peripheral marginal edge contour of a contoured article to be inspected, such as a bent glass sheet, e.g. an automotive lite. The article is supported by the article supporting surface of the fixture. The apparatus further includes position-sensing facilities, e.g. a linear potentiometer, and facilitates, e.g. a robot, for moving the potentiometer about the periphery of the article to be inspected, to generate a plurality of signals indicative of the gap between a plurality of predetermined points around the marginal edge periphery of the article supporting surface and a corresponding plurality of points around the marginal edge periphery of the article. The apparatus further preferably includes a computer or the like for processing the generated signals to provide information about the contour characteristics of the article, e.g. bend, sag, kink, or the like. Also disclosed herein is a method for using the apparatus of this invention.

Claims

1. An apparatus for determining contour characteristics of a shaped article, comprising:

a supporting surface;

first means for determining contour of said supporting surface;

first means responsive to said first determining means for generating position reference points and reference values;

second means for determining contour of an article while supported on said supporting surface;

second means responsive to said second determining means and said first generating means for generating a thickness value for each position reference point; and

third means responsive to said first and second generating means for determining contour characteristics of the shaped article.

4. The apparatus as set forth in claim 1 wherein said first responsive means includes generating means for calculating distance between each of said position reference points along contour of said supporting surface.

5. The apparatus as set forth in claim 4, wherein it further comprises means for recording each said calculated distance.

6. The apparatus as set forth in claim 4 further comprising means for comparing thickness value for each position reference point with predetermined maximum allowable thickness value.

8. The apparatus as set forth in claim 1, wherein said third means includes means for determining bend, sag, and/or kink of said article, and/or gap between said supporting surface and a major surface of said article.

9. The apparatus as set forth in claim 8, wherein said first and second determining means includes a robot having an arm and, wherein further, said first and second generating means includes signal generating means mounted to said robot arm.

10. The apparatus as set forth in claim 9, wherein:

said robot is operatively connected to a first computer;

said signal generating means is operatively connected to a second computer; and

,

said first and said second computer are operatively interfaced.

11. The apparatus as set forth in claim 10, wherein said signal generating means comprises a linear displacement transducer or a linear encoder.

2. An apparatus for determining contour characteristics of a shaped glass article, comprising:

a supporting surface;

first means for determining contour of said supporting surface;

first means responsive to said first determining means for generating position reference points and reference values;

second means for determining contour of an article while supported on said supporting surface;

second means responsive to said second determining means and said first generating means for generating a thickness value for each position reference point; and

third means responsive to said first and second generating means for determining contour characteristics of the shaped article.

3. The apparatus as set forth in claim 2, wherein said glass article comprises an automotive lite.

7. The apparatus as set forth in claim 2, wherein said supporting surface has a contour representative of the desired/ideal peripheral marginal edge contour of said glass article.

12. A method of determining contour characteristics of an article, comprising the steps of:

determining contour of a supporting surface;

positioning article on the supporting surface;

determining contour of the article supported on supporting surface; and

comparing contour of the supporting surface to contour of the article on the supporting surface to generate contour characteristics of the article.

13. The method as set forth in claim 12, wherein said comparing step includes the step of determining bend, sag, and/or kink of the article, and/or gap between the supporting surface and a major surface of the article.

14. The method as set forth in claim 12 wherein said determining step includes the steps of:

establishing reference points along on the supporting surface;

said determining step includes;

measuring distance at each reference point between unsupported surface of the article and the supporting surface to provide a measured distance for each reference point; and

said comparing step includes;

comparing the measured distances to reference points to determine contour of article; and

comparing determined contour of the article to a desired contour.