Dating glass containers incorporated bottles
As the container is blown to its final shape its sides that have touched will move away from each other drawing a small thread of glass therebetween, thus forming what is termed a birdswing. The detection of the deflected light may be accomplished from either above or below the container. 1 is a perspective view of one embodiment of the invention showing a bottle in position to be inspected to determine whether or not a birdswing is present in the bottle; FIG.
While in the inspection area 18, the bottle 10 is supported on a circular base pad 20, which is connected to the plate 16 by two ribs 22. Although a laser is used, a finely focused beam of light other than laser light could also be utilized.
Two of the deflected beams 32 which are shown strike the photocell array 26.
If no birdswing were present the laser beam 30 would pass through the bottom of the bottle 10, as is shown by a dashed line 31.
However in every instance when a birdswing is formed, there will be small conical protruberances from the sidewalls in a direction of the opposite sidewalls, coincident with the formation of the birdswing. 3A and 3B are side elevational view, partially in section, of the invention showing alternate orientations of a laser source which is utilized in the inspection of bottles; FIG. 1, showing an electro-optical scanning system which may be used to inspect a bottle; and FIG. A circular photocell array 26 is located beneath the base pad 20 and receives light which is scattered from the birdswing 14.
5 is a partial block, partial schematic view of a circuit which is used in connection with the detection of birdswings. 1 there is shown a glass bottle 10 having a finish area 12 and with an included birdswing defect 14. The photocell array 26 is generally coaxial with the base pad 20 and the bottle 10, and its diameter is somewhat larger than that of the bottle 10.