METHOD AND APPARATUS FOR INSPECTING GLASS CONTAINERS FOR CHECKS

摘要

A method and apparatus are provided for inspecting glass containers for checks (56). The container finish is illuminated from the exterior and light reflected from a check is detected by the apparatus. In one embodiment, the glass container (4) finish is inspected for horizontal and related diagonal checks and, in another, the glass finish is inspected for vertical and related diagonal checks. The checks redirect the normal beam of light and thereby permit the reflected light to be delivered to a detector (12) which converts the received light into a corresponding electrical signal which is compared to a standard in order to determine whether the container should be rejected (22). The method eliminates incorrect inspection results due to reflection of light caused by threads, lugs, mold seams, takeout beads and the sealing surface of the container mouth. The vertical and horizontal embodiments may be combined into a single system which inspects for vertical, horizontal and diagonal checks.