JPS6110748A - Detecting method of defective bottle mouth - Google Patents

Abstract

PURPOSE:To ensure the detection of a defective mouth part, by projecting light on the surface of the mouth part of a bottle from the tips of many optical fibers, forming a circular bright line, and detecting the cut parts of the bright line, which are caused by the defects such as broken parts and flaws in the mouth part. CONSTITUTION:Several-hundred pieces of optical fibers 12 are bundled and their tips 12b are arranged in a ring shape on the upper part of the mouth part of a bottle 11. Light from, e.g., a halogen lamp 13, is converged by a reflecting mirror (not shown) and inputted to rear ends 12a of the optical fibers 12. The light is uniformly projected on the mouth part 14 at a specified angle. A circular bright line having high luminance is formed on the surface of the mouth part 14. When broken parts, flaws, cracks, contamination and the like are present in the mouth part 14, cut parts are caused on the bright line. The image of the circular bright line is formed on a substrate 16 through a scanner 15. The cut parts are detected by photosensors 17-22. Thus the defects such as broken parts and cracks of the mouth part 14 can be detected.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention provides circular bright lines on the surface of the 10th part of the bottle so that when there is a spark, a scratch, a crack, a stain, etc. A method for detecting defective bottle openings is provided in which defective bottle openings are detected by forming the bright lines and detecting breaks in the bright lines.

Conventionally, as shown in FIG. 1, a method for detecting a spark in a bottle involves arranging a plurality of light emitters 2 around a bottle mouth 1, and emitting light of a specific frequency from the light emitters 2 to the bottle mouth lK. If there is a pilot flame 3 at the bottle opening 1, the emitted light is
The pilot flame is detected by a sensor 4 installed at the front. In this case, if there are relatively large sparks, it cannot be detected, and the detection rate varies greatly depending on the width and depth of the spark, and if even a small amount of the top of the bottle mouth remains, it cannot be detected. Furthermore, there is a drawback that scratches, cracks, dirt, etc. on the mouth cannot be detected.

An object of the present invention is to provide a method for detecting defective bottle openings that can eliminate the above-mentioned drawbacks. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In FIGS. 2 to 4, 11 is a bottle flowing by a conveyor line (not shown), and 12 is, for example, 0.5
It is a bundle of several hundred optical fibers having a diameter of wm, and the light emitted from, for example, a mini halogen lamp 13 is directed from the rear end 12a so that it is focused by a reflecting mirror (not shown) and then incident. , and its tip 12b is arranged above the mouth 14 so as to press against the mouth 14 in a ring shape larger than the outer diameter of the mouth 14.

Light incident from the rear end 12a is uniformly irradiated onto the mouth portion 14 at a predetermined angle, and if there are any sparks, scratches, cracks, stains, etc. on the mouth portion 14, the scratches, cracks, etc.

The mouth part 1 is formed on the surface of the mouth part 14 so that cuts are made in dirty parts etc.
A high-intensity circular emission line concentric with 4 is formed. A scanner 15 forms an image of the circular bright line on the substrate 16, and is installed above the mouth 14 so that the center line a of the mouth 4 and the optical axis are aligned with each other.

Reference numerals 17 to 22 designate photosensors arranged at the position 1 of the image formed on the substrate 16.

The scanner 15 is composed of a lens 31, a prism 32, etc., and is rotated at high speed around an optical axis by a motor (not shown).
The image formed above is rotated around the center of the image.

Next, the operation of the embodiment constructed as described above will be described. First, the scanner 15 is rotated around the optical axis, and the mini halogen lamp 13 is turned on.

As a result of this lighting, the light is focused by a reflecting mirror (not shown) and is made to enter the rear end 12a of the optical fiber 12. The light incident on the rear end 12a is transmitted from the tip 12b to the mouth 14, and the third
Irradiate uniformly at a predetermined angle as shown in the figure. Then, by this irradiation, the mouth part 14 is exposed to the mouth part 14 as shown in FIG.
A high-intensity circular emission line M concentric with 4 is formed, and an image of the emission line M is further formed on the substrate 6 by the scanner 15. If the main opening 14' is lit as shown in FIG. 5, a cut will be made in the bright line M', and a cut Q will be made in the image S of the bright line M as shown in FIG. The scanner 15 is the mouth part 1
Since the image S rotates around the optical axis which is in line with the center line a of the image S, the image S rotates around the center P as a fulcrum. Therefore, since the cut Q rotates about the center P as a fulcrum, when the scanner 15 rotates 1/6, the photo sensor 17
Alternatively, the photo sensor 22 detects the cut Q. This allows the pilot flame to be detected.

The cuts Q in the bright line M' are caused not only by small sparks but also by scratches, cracks, dirt, vertical slips, horizontal deviations, etc. as shown in Fig. 7.8. It is possible to detect horizontal deviations, etc. Additionally, since six photo sensors are used, once the scanner 15 rotates, it is possible to inspect the entire circumference of the bottle opening 14, and any defects in the opening can be detected instantaneously (about IA o o o seconds). be able to. Of course, the number of photo sensors is not limited to six, and any number may be used.

As described above, the present invention irradiates light from each tip of a plurality of optical fibers to the mouth of a bottle, and when one mouth has scratches or stains, the first mouth is irradiated with light so that a cut is created at the uneven part. forming a circular bright line on the surface, using a scanner installed above the mouth to form an image of the circular bright line above the scanner, and rotating the scanner to rotate the image;
This is because a photo sensor installed at the image formation position detects the cut in the image and detects defects in the mouth.
Small mouth burns or scratches.

This has the effect of being able to reliably detect mouth defects such as cracks and dirt.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the conventional detection method for detecting a spark;
The figure is a schematic perspective view of the embodiment, FIG. 3 is a sectional view of FIG. 2, FIG. 4 is an explanatory diagram of an elliptical bright line formed on the mouth surface, and FIG. Fig. 6 is an explanatory diagram of the formed circular bright line, Fig. 6 is an explanatory diagram of the positional relationship between the image formed on the substrate and the photo sensor, and Figs. 7 and 8 are explanatory diagrams of the vertical deviation and horizontal deviation of the bottle mouth. be. 11... Bottle ] 2... Optical fiber 1
2b...Tip 14...Mouth 15...
Scanner M...Circular bright lines 17-22...Photosensor collapse Figure 2 Figure Atsushi 3 Figure I et al Figure 6

Claims (1)

[Claims] 1. Light is irradiated onto the mouth of the bottle from each tip of a plurality of optical fibers arranged above the mouth of the bottle in a ring shape that is larger than the outer diameter of the mouth. If there is a scratch or dirt on the mouth, a high-intensity circular bright line is formed on the mouth surface and is concentric with the mouth so that a cut is created at the scratch or dirt. An image of the circular bright line is formed above the scanner, and the image is created by rotating the scanner around the optical axis. A method for detecting defects in a bottle opening, characterized in that the image is rotated around the center and a photo sensor installed at the image forming position detects a cut in the image to detect defects in the opening.