JPH07102978B2 - Inspection method for glass bottles - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved method for inspecting glass bottles.

[0002]

2. Description of the Related Art A method for inspecting a glass bottle, in which the mouth of a glass bottle is photographed by a camera having a built-in photodiode array and defects such as cracks that reflect light rays are detected by image processing is disclosed in It is conventionally known as disclosed in Japanese Patent Publication No. 2-45144.

In the past, however, since the entire mouth of the glass bottle was processed in a lump, the same defective signal would be emitted regardless of the defect in any part of the screen. It was not possible to identify whether it was a surface defect, a threaded part defect, or a stepped part under the screw. Therefore, there is a problem in that it is not possible to take appropriate corrective action in the molding process depending on the occurrence status of defects.

Therefore, it is conceivable to install a plurality of cameras and measure the defects of each part individually, but it is not easy to install a large number of cameras in a narrow space, and a large number of expensive cameras are used. Was economically unfavorable.

[0005]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and enables the defects in the vicinity of the glass bottle to be individually identified without using a large number of cameras. It was completed to provide a bottle inspection method.

[0006]

[Means for Solving the Problems] The above problem is that a specific portion of a glass bottle is photographed by a camera, the image is divided into a plurality of preset windows on the screen, and the binary image of each window is set. The presence or absence of defects is determined by collecting the data, and the data is aggregated for each window to determine if there is a defect in the vicinity of the glass bottle.
The problem can be solved by the glass bottle inspection method, which is characterized in that the defects are individually identified .

[0007]

The present invention will be described below in more detail with reference to the illustrated embodiments. In FIG. 1, 1 is a glass bottle to be inspected (only the upper part is shown), 2 is an illuminator such as a halogen lamp, 3 is a camera head for photographing the mouth of the glass bottle 1, and 4 is a camera amplifier. Further, 5 is an image processing device for processing an image obtained from a camera, 6 is a monitor television, 7 is a printer, and 8 is an external controller. The external controller 8 receives a signal from the photoelectric sensor 9 for confirming that the glass bottle 1 has come to the inspection position, issues a measurement command signal to the image processing device 5, and processes from the image processing device 5. It is for receiving a generated image signal and operating a discharge mechanism or the like (not shown).

In the present invention, the image processing apparatus 5 sets a window for an image taken by a single camera. (See FIG. 2) As shown in FIG. 3, in the embodiment, three windows 1
0, 11, and 12 are set. Each window can be freely set by switching the screen of the monitor television 6 to the window setting screen and moving the cursor on the screen. The window 10 corresponds to the top of the glass bottle 1, the window 11 corresponds to the screw portion, and the window 12 corresponds to the stepped portion (bead portion) below the screw.

The image processing apparatus 5 has windows 10, 11, 12
The image is binarized for each time, and defects such as cracks that reflect light rays are taken out, and the presence or absence of defects is determined by checking whether or not the size exceeds an allowable value as in the conventional case. In this case, an allowable value can be set for each of the windows 10, 11 and 12, and the defect inspection can be performed in consideration of defects that are likely to occur in each part. When a defect is detected, the external controller 8 operates the discharging mechanism (not shown) to remove the glass bottle 1 from the line. At the same time, a counter built in the external controller 8 collects data on the number of detected defects for each window.

Therefore, according to the present invention, the defect occurrence status of the mouth portion of the glass bottle 1 can be aggregated by dividing it into, for example, the top portion, the screw portion, and the step portion (bead portion) below the screw. By knowing whether or not a defect has occurred, it is possible to take corrective action in the molding process and quickly prevent the occurrence of a defect.

As a result of inspecting the mouth portion by pouring 5000 pepper bottles into the line, 21 mouths corresponding to the window 10, 8 screw portions corresponding to the window 11 and 12 windows. One defect was detected in the step (bead) under the corresponding screw, and according to the conventional method, only the total number was found, whereas many defects were concentrated in the mouth. It came to be understood automatically.

[0012]

As described above, according to the present invention, an image of a glass bottle is divided into a plurality of windows, and the presence or absence of a defect is determined for each window, so that the defect in the vicinity of the glass bottle is detected. Can be individually identified. Further, according to the present invention, since the number of cameras corresponding to the number of windows is not required, there is an advantage that it is not necessary to install a large number of cameras in a narrow space. Therefore, the present invention greatly contributes to the industry as a glass bottle inspection method that solves the conventional problems.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram illustrating functions of the image processing apparatus of the present invention.

FIG. 3 is a front view illustrating a window in the embodiment.

[Explanation of symbols]

 1 Glass Bottle 2 Illuminator 3 Camera Head 4 Camera Amplifier 5 Image Processing Device 6 Monitor Television 7 Printer 8 External Controller 9 Photoelectric Sensor 10 Window 11 Window 12 Window

Claims (1)

[Claims] 1. A specific portion of a glass bottle is photographed by a camera,
The image is partitioned by a plurality of preset windows on a screen, the presence or absence of a defect is determined by performing the binarization of the image for each window, performing data aggregated by the window
A method for inspecting a glass bottle, wherein defects in the vicinity of the glass bottle are individually identified .