JPS5840690B2 - Bottle seam detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bottle seam detector in an automatic bottle inspection device.

Generally, the surface of bottles for beer and other soft drinks often have seams in the axial direction due to the manufacturing method.

When such a bottle is inspected using a conventional automatic flaw inspection device, it is difficult to detect this seam as a flaw and to distinguish between a trench seam and a flaw.

In the present invention, when an empty bottle is irradiated with flat light (light parallel to the axial direction of the bottle) or traveling light (light traveling in the axial direction of the bottle) emitted from a light source, this light beam always reaches a specific point at the seam. This was accomplished by focusing on refraction and reflection at different angles, and this is the most important point of the present invention.

In other words, when a light beam is irradiated onto a scratch on a bottle, the light is often refracted and reflected at a greater angle than the refraction angle at the seam, and the entire flat light is not refracted like the seam, but rather Partial refraction and reflection of light occurs.

On the other hand, it has been experimentally confirmed that the entire flattened light is always refracted and reflected at the seams of the bottle, and that the angle of refraction and the amount of reflection are almost constant.

Therefore, by providing a light receiving element that receives flat light at a position corresponding to the refraction and reflection caused by the seam, it becomes possible to distinguish between the seam and the scratch.

FIG. 1 is a diagram (plan view) illustrating the present invention in detail, where 1 indicates a bottle, and 2 is a light source.The light source 2 irradiates the side of the bottle 1 perpendicularly and passes through the bottle 1. Get to the point.

However, if there is a seam in the part of the bottle 1 that is irradiated with the light beam, the light beam is refracted at an angle α and reaches point B.

Here, since the refraction angle α of the light at the seam of the bottle is approximately constant as described above, the position of the seam of the bottle can be known by detecting the presence or absence of the light beam at point B and point A.

In addition, as shown in Fig. 3 (detailed operation explanation will be given later), an optical detector is used that converts reflected light into an electrical signal using a photoelectric conversion element that changes reflected light due to unevenness on the bottle surface that occurs during bottle making.
At least two or more rain detectors are arranged at a certain distance on the same axis above and below, and the joint is detected by the logical product (AND circuit) of the abnormal signals from the rain detectors.

That is, as mentioned above, since the seams occur linearly over a wide range from the bottle mouth to the bottom, all the detectors simultaneously detect the reflected light.

On the other hand, most of the scratches are limited to a small area due to their size, so not all detectors detect reflected light at the same time.

Therefore, the seam can be detected by processing the signals from these detectors into a logical product.

That is, in the case of a seam, the logical product is 1, and in the case of a scratch, it is O.

In addition, when two optical detectors are used, it is also possible to replace one of the detectors with a flaw detector.

By arranging the flaw detector and the seam detector in parallel, if the flaw detector outputs a signal generated by the seam of the bottle, the seam detector also outputs the seam signal at the same time. It is possible to distinguish between flaws and seams by processing both signals using logical product.

FIG. 2 is a side view showing an embodiment of the present invention, and numeral 1 denotes an empty bottle to be inspected, which is rotating around its axis.

Reference numeral 2 indicates a flat beam of light as shown by diagonal lines in FIG. 2 by scanning with a light source such as a laser oscillator or through a slit.

3A and 3B are points A and B (second point) in Figure 1, respectively.
The light rays received by the light receiving elements 3A and 3B are photoelectrically converted by the light receiving elements provided at eight points (one location in the figure).

Next, this operation will be explained.

The light beam emitted from the light source 2 passes through the bottle 1 and is received by the light receiving element 3A.

Here, when the side seam of the bottle 1 coincides with the incident optical axis of the flat light beam, the light beam is refracted and reaches the light receiving element 3B.

On the other hand, when a flaw on the bottle coincides with the incident optical axis, most of the light refracted by the flaw crosses the range between B and B in FIG. 1 and is refracted at an angle greater than α.

Therefore, in this case, no light rays enter the light receiving element 3B.

By obtaining an electrical signal from the light receiving element 3B, a signal outputted from a flaw inspection device (not shown) to a seam detector that misidentifies this seam as a flaw is not a flaw signal, but is actually a signal caused by the seam of the bottle. One thing can be determined.

Therefore, if this seam detector is used in combination with a conventional flaw inspection machine, it is possible to easily distinguish between a signal due to a seam and a flaw signal.

The diagram shown in Figure 3 is used in conjunction with the device shown in Figure 2 to further improve the performance of the seam detector shown in Figure 2. This device accurately detects a seam within a range that cannot be distinguished from a seam at all. In the figure, 4 and 4' are light sources, 5 and 5' are light receiving elements, and 6 is an AND circuit.

As is clear from the drawings, this embodiment receives the reflected light from the side surface of the hinge 1, and changes in the reflected light due to the seams occur simultaneously in the light receiving elements 5 and 5' located vertically on the same axis. On the other hand, changes in the reflected light due to scratches or the like are limited to a small range, so it is very unlikely that these changes will occur at the same time in the upper and lower directions.

Therefore, when there is an output from the AND circuit 6, it can be regarded as a seam.

゛As explained above, according to the present invention, it is possible to accurately detect the seam of the hinge, and by using it in conjunction with a flaw inspection machine, even if the flaw inspection machine misidentifies the seam and flaw, it will not be detected. As a result, it is possible to see that the error is a misidentification, and as a result, it has many effects such as being able to prevent misidentification.

[Brief explanation of the drawing]

Figure 1 is a principle diagram for explaining the present invention, Figures 2 and 3 are
The figures are a side view and a perspective view showing an embodiment of the present invention. 1:Hin, 2. 4.4': Light source, 3A, 3B, 5°5
':Light receiving element.

Claims (1)

[Scope of Claims] 1. A light source that irradiates a bottle to be inspected with a flat beam of light parallel to the axial direction of the bottle at right angles to the axis of the bottle, and a light source that is placed at a position targeted by the light source and that A bottle seam detector comprising a light receiver that receives transmitted light, and a light receiver that receives the transmitted light and is placed on an optical path through which the flattened light transmitted through the seam of the bottle passes. 2. A light source that irradiates the bottle to be inspected with a flat beam of light that is parallel to the axial direction of the bottle and perpendicular to the side surface of the bottle, and a light receiver that is placed at a target position of the light source and receives the light transmitted through the bottle. a light receiver disposed on an optical path through which the flattened light transmitted through the seam of the bottle passes, and at least two light sources that irradiate light beams to different positions on the same generatrix of the bottle; a light receiver corresponding to the at least two light sources that receives the reflected light at a position through which the reflected light from the seam of the bottle to be inspected passes; and an AND circuit that obtains an AND output of the photoelectric conversion output signal from the light receiver. A bottle seam detector consisting of: