Method of inspecting a wrap-fitted state of a cap wrap-fitted to a neck of a bottle and apparatus therefor

A device for inspecting a wrap-fitted state of a cap of a bottle-cap assembly in which the cap is wrap-fitted to a neck of a bottle, by detecting a positional relationship between a bottle mark formed on the neck of the bottle and a cap mark formed on the cap, comprising:

• an optical lens arranged at a higher position on a vertical center axis of said bottle-cap assembly in a manner that an optical axes thereof are in agreement;
• a single camera for simultaneously shooting the bottle mark and the cap mark through said optical lens;
• an illumination device for illuminating said bottle mark and said cap mark or the vicinities thereof;
• and
• an image processor for reading out the bottle mark and the cap mark from the image data shot by the camera, expanding, as required, the bottle mark and the cap mark to detect the positions thereof, calculating an angle between the bottle mark and the cap mark, and judging whether the wrap-fitted state is acceptable relying upon the angle.

A method of inspecting a wrap-fitted state of a cap of a bottle-cap having a top panel and a skirt is wrap-fitted to a neck of a assembly in which the cap bottle, by detecting a positional relationship between a bottle mark formed on the bottle and a cap mark formed on the cap;

• wherein
• an optical lens is arranged at a higher position on a vertical center axis of said bottle-cap assembly in a manner that the vertical center axis is in agreement with an optical axis thereof;
• a single camera is arranged at a higher position on the optical axis of said optical lens to image the bottle mark and the cap mark through the optical lens;
• an illumination device is arranged for illuminating the bottle mark and the cap mark or the vicinities thereof;
• and
• the bottle mark and the cap mark are simultaneously shot by the camera, and the obtained image is sent to an image processor to detect a positional relationship between the bottle mark and the cap mark, wherein the bottle mark and the cap mark are read out from an image data received by the image processor into polar coordinates with the cap as a center and, as required, are expanded to detect the positions thereof, a distance of expansion between the bottle mark and the cap mark is calculated, and whether the wrap-fitted state is acceptable is judged relying upon the expanded distance.

A device for inspecting a wrap-fitted state of a cap of a bottle-cap assembly in which the cap is wrap-fitted to a neck of a bottle, by detecting a positional relationship between a bottle mark formed on the neck of the bottle and a cap mark formed on the cap, comprising:

• an optical lens arranged at a higher position on a vertical center axis of said bottle-cap assembly in a manner that an optical axes thereof are in agreement;
• a single camera for simultaneously shooting the bottle mark and the cap mark through said optical lens;
• an illumination device for illuminating said bottle mark and said cap mark or the vicinities thereof;
• and
• an image processor for reading out the bottle mark and the cap mark from the image data shot by the camera, expanding, as required, the bottle mark and the cap mark to detect the positions thereof, calculating a distance of expansion between the bottle mark and the cap mark, and judging whether the wrap-fitted state is acceptable relying upon the expanded distance.