Inspection method for cap installation condition

摘要

An inspection method capable of performing an inspection for all items concerning the installation condition of a cap by a single imaging process. A mark is formed on the outer peripheral surface of a cap. A bag fitted with the cap is held with a holding device so as to face an imaging device in a predetermined positional relationship to take a vertical image of the whole cap. The mark and two portions of the cap at bilaterally symmetric positions near right and left side edge portions in the vicinity of the upper end edge of the cap, together with a ring, are defined as inspective object portions. First, second and third inspection gates are set in correspondence to the inspective object portions. Portions of the images of the inspective object portions present within the inspection gates are subjected to image processing to obtain data for judgment. The data for judgment is compared with preset reference values to judge whether the installation condition of the cap is good or not.