JPH02257044A - Device for inspecting bottle - Google Patents

Abstract

PURPOSE:To enhance the accuracy of detecting the defect of a bottle mouth by providing a rotary mirror which removes the image formed by unnecessary scattered light from a pair of light rays with which a bottle is irradiated from above at a specific angle with the transporting direction of the bottle in the position upward at a specific angle with mouth threads to receive the light rays. CONSTITUTION:Light sources 3 are mounted above the bottle 1 in the front and rear of the transporting direction 2 of the bottle in such a manner that the mouth and threaded part 4 of the bottle 1 are irradiated diagonally from about 45 deg.. The bottle mouth and threaded part 4 are photographed by a television camera 6 via the mirror 5 existing at about 45 deg. diagonally upward on the plane perpendicular to the transporting direction 2 inclusive of the point where the optical axes of both the light sources 3 intersect with each other. The bottle 1 is transported while the bottle 1 is rotated, then the mirror 5 is scanned in follow up to the movement thereof so that the images of the bottle mouth and threaded part 4 comes to the visual field center of the camera 6. A light shielding plate 7 is provided on the reflecting surface of the mirror 5 and the unnecessary scattered light of the bottle mouth and threaded part 4 is removed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a bottle inspection device that optically detects defects such as bottle holes, cracks in threaded portions, and chips occurring in drink bottles, beer bottles, and the like.

[Conventional technology]

Conventionally, this type of bottle inspection equipment installed a link-type light source above the bottle mouth, and used a TV camera placed on the central axis above the bottle mouth to take a white image of the bottle. A method of testing was used.

[Problem to be solved by the invention]

The above-described conventional bottle inspection apparatus has the drawback that it is difficult to detect defects occurring inside the bottle mouth or in the threaded portion because only the top surface of the bottle mouth is illuminated.

[Means to solve the problem]

The bottle inspection device of the present invention is provided with a pair of light sources that do not illuminate the screws of the bottle from both front and back diagonally above about 45 degrees with respect to the conveyance direction of the bottle being conveyed while rotating, and a point where the lights of the two light sources intersect. A mirror that rotates in accordance with the movement of the bottle is arranged diagonally above the round screw at an angle of about 45 degrees on a plane perpendicular to the conveying direction, and a television camera is used to direct the threaded part of the bottle opening through this mirror. and providing a light shielding plate on the mirror to remove unnecessary scattered light on the left and right sides of the screw part of the bottle in the image taken by the television camera,
The present invention is characterized in that a window for defect inspection is provided in the center of the screw portion of the bottle as seen by the television camera.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a perspective view of one embodiment of the present invention.

A light source 3 is installed at each of the front and rear sides of the bottle 1, which is being conveyed while rotating, in the conveyance direction 2.
The lower screw part 4 of the bottle is illuminated with a television camera 6 through a mirror 5 from an angle of 45 degrees diagonally upward on a plane that includes the point where the optical axes of both light sources 3 intersect and is perpendicular to the transport direction 2. I'm filming. By rotating the fan 1, it becomes possible to capture an image of the entire surface of the fan screw part 4 on the television camera 6.

The bottle 1 is conveyed while being rotated, and a conventionally known mirror 5 is scanned to follow the movement of the pin 1 so that the image of the lower screw part 4 of the bottle is aligned with the center axis of the field of view of the television camera 6. We use technology to Since the television camera 6 takes out an image every 16.7 m5ec per screen, images corresponding to a plurality of screens are continuously taken out and processed while the bottle rotates.

Figure 2 shows an example of a screen shot of the lower screw part 4 of a bottle taken by the television camera 6, and Figure 2 (a) shows a mirror 5 of a good bottle.
2(b) is an image when the mirror 5 of a good bottle has a light shielding plate 7. FIG. 2(c) is an image when the mirror 5 of a defective bottle has a light shielding plate 7. Figure 2 (d) is the effective processing range window 9.10.
FIG. 2(e) shows the actual screen taken by the camera 6.

Since the conveyance direction side of the bottle lower screw part 4 is illuminated by the light source 3, the image taken by the television camera 6 is as shown in FIG. 2(a).
Even in a good bottle, the left and right sides of the lower screw portion 4 are brightly illuminated, or the light toward the center of the lower screw portion 4 is not easily reflected diffusely toward the camera 6, and the center portion is dark. While the brightly illuminated parts on the left and right follow the movement of the mirror 5 and bottle 1, the positional relationship with the light source 3 is slightly related,
In this embodiment, a light shielding plate 7 is provided on the reflective surface of the mirror 5 because the brightness changes and if the light source with the light amount 3 is set too high, it becomes too bright and affects the overall level of the television camera 6.
This effect is removed by blocking the bright parts on the left and right sides of the lower screw part 4 with the image of the television camera 6 as shown in FIG. 2(b).

If there is a defect in the bottle lower screw portion 4, it will be diffusely reflected and shine brightly as shown in image 8 shown in FIG. 2(c). The image 8 of this defect remains as an afterimage in the circumferential direction of the bottle lower threaded portion 4 as the bottle 1 rotates during the processing waiting time of approximately 1, 6, and 7 m5ec for one screen. '), it can be photographed with tails trailing in the circumferential direction.

Since the camera 6 is taking images from diagonally above, as shown in Figure 2 (
As shown in d) and (e), among the images of the bottle lower screw part 4, the image is an image of the upper bottle lower screw part 4 looking into the opposite side of the camera 6 from inside, and the lower side 10 is the bottle lower screw part 4.
This is an image of the front side of the camera 6 viewed from the outside.

Therefore, the defect 8 passes through the center of the bottle lower screw part 4 through the upper side 9 and the lower side 10, and the defect 8 which is not scattered to the camera 6 only on one side can be inspected on both the upper side and the lower side 10. Detection accuracy can be improved.

Since the brightness level of the image is different between the upper side 9 and the lower side 1.0, windows 11 and 12 of the processing effective range for defect detection are separately provided as shown in FIG. 2(d).
The brightness determination level for detecting defects is set separately for each of 1.12 and 1.12.

〔Effect of the invention〕

As explained above, the present invention uses a television camera to receive scattered light that is diffusely reflected diagonally above defects such as cracks, chips, and white foreign matter that occur in the lower screw portion of a bottle that is being conveyed while rotating. By installing a light-shielding plate on the reflective surface of the scanning mirror in front of the TV camera and removing unnecessary scattered light from the bottle and threaded parts, it is possible to inspect the entire surface of the bottle and threaded parts for defects. .

[Brief explanation of drawings]

FIG. 1 is an external view of one embodiment of the present invention, and FIG. 2 is a diagram showing an example of a screen of an image taken by the television camera 6 shown in FIG. 1. In the figure, 1 is a bottle, 2 is a conveyance direction, 3 is a light source, 4 is a sink, a screw part, 5 is a mirror, 6 is a television camera, 7 is a light shielding plate, and 8 is an image due to a defect. ], ],, 1.2 indicates a window.

Claims (1)

[Claims] A pair of light sources is provided that illuminates the cap screw of the bottle from both the front and back diagonally above at an angle of about 45 degrees with respect to the conveying direction of the bottle being conveyed while rotating, and the direction is perpendicular to the conveying direction, including the point where the lights of the two light sources intersect. A mirror that rotates in accordance with the movement of the bottle is placed about 45 degrees diagonally above the cap screw on the surface, and the screw portion of the bottle cap is photographed by a television camera through this mirror. A light-shielding plate is provided on the mirror to remove images caused by unnecessary scattered light on the left and right sides of the bottle cap screw part in the image taken by the television camera, and a light shielding plate is provided on the mirror to remove images caused by unnecessary scattered light on the left and right sides of the bottle cap screw part in the image taken by the television camera. A bottle inspection device characterized by having a window.