Container inspection arrangement for inspecting glass and/or plastic containers and a method of inspecting glass and/or plastic containers

Patent metadata

Field	Value
Publication number	US-9541506-B2
Application number	US-201514626337-A
Country	US
Kind code	B2
Filing date	Feb 19, 2015
Priority date	Aug 20, 2012
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

A container inspection arrangement for inspecting glass and/or plastic containers, and a method of inspecting glass and/or plastic containers. The abstract of the disclosure is submitted herewith as required by 37 C.F.R. §1.72(b). As stated in 37 C.F.R. §1.72(b): A brief abstract of the technical disclosure in the specification must commence on a separate sheet, preferably following the claims, under the heading “Abstract of the Disclosure.” The purpose of the abstract is to enable the Patent and Trademark Office and the public generally to determine quickly from a cursory inspection the nature and gist of the technical disclosure. The abstract shall not be used for interpreting the scope of the claims. Therefore, any statements made relating to the abstract are not intended to limit the claims in any manner and should not be interpreted as limiting the claims in any manner.

First claim

What is claimed is:

1. A container inspection arrangement for inspecting glass and/or plastic containers, said container inspection arrangement comprising:
a transport arrangement to move containers along a transport path to, through, and from an inspection area;
at least one illumination unit to illuminate containers;
a hollow body and a drive unit connected to said hollow body to rotate said hollow body about a central axis of said hollow body;
said hollow body being disposed at said inspection area such that said hollow body is nearer a bottom of a container than a mouth of the container upon the container being in said inspection area;
an optical structure being mounted in a stationary manner within said hollow body such that said optical structure does not move with said hollow body upon rotation of said hollow body;
at least one camera being disposed to receive light via said optical structure to obtain images of at least one of: a bottom portion of the container and a body portion of the container, as viewed from the bottom of the container toward the mouth of the container; and
said at least one illumination unit comprises a ring-shaped light disposed inside said hollow body.

2. The container inspection arrangement according to claim 1 , wherein said hollow body is disposed at said inspection area such that said hollow body is underneath a container upon the container being in said inspection area.

3. The container inspection arrangement according to claim 2 , wherein said ring-shaped light is disposed substantially concentrically around said optical structure.

4. The container inspection arrangement according to claim 3 , wherein said at least one illumination unit also comprises an additional light disposed as area lighting outside said hollow body.

5. The container inspection arrangement according to claim 4 , wherein:
said ring-shaped light and said additional light are configured to emit light of different color spectra; and
the container inspection arrangement is configured to inspect containers by at least one of: the dark field method and the transmitted light method.

6. The container inspection arrangement according to claim 5 , wherein said optical structure comprises at least one lens system and at least one mirror.

7. The container inspection arrangement according to claim 6 , wherein said at least one mirror is semi-transparent.

8. The container inspection arrangement according to claim 7 , wherein:
said at least one camera comprises a first camera and a second camera; and
said second camera is disposed beside said hollow body and is oriented with its optical axis substantially parallel to the center axis of said hollow body.

9. The container inspection arrangement according to claim 8 , wherein said first camera is disposed below said hollow body and is oriented with its optical axis substantially perpendicular to the center axis of said hollow body, which hollow body is substantially cylindrical.

10. The container inspection arrangement according to claim 1 , wherein said at least one camera is disposed to receive light via said optical structure to obtain images of both the bottom portion of the container, and a neck area and a shoulder area of the container.

11. The container inspection arrangement according to claim 1 , wherein said transport arrangement comprises:
a first conveyor configured to move containers to the inspection area;
a second conveyor configured to move containers from the inspection area;
said first conveyor and said second conveyor are separated from one another by a gap at the inspection area; and
a third conveyor configured to carry containers over the gap from said first conveyor to said second conveyor to permit inspection of the container from under the container at the inspection area.

12. A method of inspecting glass and/or plastic containers using a container inspection arrangement, said method comprising:
transporting a container using a transport arrangement along a transport path to an inspection area;
illuminating the container using at least one illumination unit;
transmitting a portion of the light that illuminates the container through a hollow body, which hollow body is rotatable about a central axis thereof using a drive unit connected thereto, and which hollow body is disposed at said inspection area such that said hollow body is nearer a bottom of the container than a mouth of the container;
transmitting the portion of the light to an optical structure, which optical structure is mounted in a stationary manner within said hollow body such that said optical structure does not move with said hollow body upon rotation of said hollow body;
receiving the portion of the light using at least one camera, and thereby obtaining images of at least a portion of the container, as viewed from the bottom of the container toward the mouth of the container;
detecting at least one of: the inner surface of the container, the position of the mouth of the container, the geometry of the mouth of the container, and the symmetry of the container; and
said at least one illumination unit comprises a ring-shaped light disposed inside said hollow body.

13. The method according to claim 12 , wherein:
said method further comprises moving the container in a suspended manner to an inspection area; and
said hollow body is disposed at said inspection area such that said hollow body is underneath a container upon the container being in said inspection area.

14. The method according to claim 13 , wherein said method comprises using said ring-shaped light to generate light in a dark field inspection of at least the bottom surface of the container.

15. The method according to claim 14 , wherein said ring-shaped light is disposed substantially concentrically around said optical structure.

16. The method according to claim 15 , wherein said at least one illumination unit also comprises an additional light disposed as area lighting outside said hollow body, and said method comprises using said additional light to generate light in a transmitted light inspection of at least a portion of the container.

17. The method according to claim 16 , wherein:
said ring-shaped light and said additional light are configured to emit light of different color spectra;
said optical structure comprises lens systems and at least one mirror; and
said method further comprises transmitting light from one to another of said lens systems.

18. The method according to claim 17 , wherein:
said at least one mirror is semi-transparent;
said at least one camera comprises a first camera and a second camera;
said second camera is disposed beside said hollow body and is oriented with its optical axis substantially parallel to the center axis of said hollow body; and
said method further comprising reflecting a portion of the portion of the light with said mirror to said second camera.

19. The method according to claim 18 , wherein:
said first camera is disposed below said hollow body and is oriented with its optical axis substantially perpendicular to the center axis of said hollow body; and
said method further comprising transmitting another portion of the portion of the light through said mirror to said first camera.

20. The method according to claim 12 , wherein:
the container comprises a neck area and a shoulder area; and
said step of detecting comprises detecting both the bottom portion of the container, and a neck area and a shoulder area of the container.

Assignees

• Schorn Wolfgang
• Buchwald Carsten
• Khs Gmbh

Inventors

• Schorn Wolfgang
• Buchwald Carsten

Classifications

• G01N21/90 Primary

  in a container or its contents (G01N21/91 takes precedence) · CPC title

• G01N21/9081

  Inspection especially designed for plastic containers, e.g. preforms · CPC title

• G01N21/9054

  Inspection of sealing surface and container finish · CPC title

• G01N21/9072 Primary

  with illumination or detection from inside the container · CPC title