JPH08304305A - Method for inspecting foreign matter defect of heel part of bottle - Google Patents

Abstract

PURPOSE: To provide a method for inspecting the foreign matter defect of the heel part of a bottle, which is suitable for automation in a bottle making or bottle filling factory line. CONSTITUTION: A mechanism part 19 for introducing a bottle 6 from a manufacturing line which is a known bottle conveying means; a mechanism part 16 for rotating the bottle once or more; a mechanism part for returning the bottle onto the manufacturing line; and a lighting device 8 having a quantity of light sufficient to be transmitted by the heel part of the bottle from the oblique direction of the bottle are arranged. First and second mirror devices 28, 29 following the heel part of the bottle are arranged opposite to the lighting device 8 with the bottle between, and the first and second mirror device 28, 29 are arranged at an angle of about 30 deg.-about 70 deg. to horizontal surface and at an angle different therefrom, respectively. In the same part of the heel part of the bottle, only an image of foreign matter, or both the image of foreign matter and an image of shade generated by a thickness of the bottle or fluctuation of thickness are collected by two CCD cameras 21, 22 every mirror over the whole circumference of the bottle. The two images are subjected to logical sum operation, whereby the image of shade is erased to detect the presence of the foreign matter image, whereby the presence of foreign matter is judged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bottle foreign matter defect inspection method suitable for automation in a bottle making or bottle filling factory line.

[0002]

2. Description of the Related Art Conventionally, in a bottle manufacturing or bottle filling factory line, foreign matter defect inspection of a bottle heel portion is visually performed, or a field of view of a CCD camera and known image processing are performed on a foreign matter inspection machine of a bottle bottom portion and a body portion. The upper window was extended to the vicinity of the heel portion to inspect the heel portion for foreign matter defects.

[0003]

However, it is difficult to visually identify fine defects and the productivity is low. In addition, if the bottom and the body are also used on a foreign substance inspection machine, the thickness of the bottom and the heel of the bottle, the thickness of the body and the heel, and false detection based on the shadow image due to uneven thickness or the CCD camera field of view However, there are problems such as erroneous detection depending on the angle. INDUSTRIAL APPLICABILITY The present invention is a bottle heel foreign matter defect capable of continuously and stably inspecting a bottle heel foreign matter defect such as a stone or a metal piece generated in a bottle heel portion, which has been difficult to put into practical use. The purpose is to obtain an inspection method.

[0004]

In order to achieve the above object, the present invention provides a method for inspecting a foreign matter defect in a heel portion of a bottle,
A mechanism for introducing a bottle from a production line which is a well-known bottle conveying means, a mechanism for rotating the bottle for one rotation or more, a mechanism for returning the bottle to the production line, and a heel of the bottle from an oblique direction of the bottle. An illuminating device having a sufficient amount of light to allow the light to pass through, and arranging a first mirror device and a second mirror device that follow the heel part of the jar across the bottle and face the illuminating device.
The first mirror device has a horizontal plane of about 30 degrees to about 7 degrees.
The second mirror device is arranged at an angle of 0 degree, and the second mirror device is arranged at an angle different from that, and the same portion of the heel portion of the bottle projected on each mirror is treated with two CCD cameras for each mirror. Or the image of the foreign object and the shadow image caused by the thickness or variation of the thickness of the bottle are taken over the entire circumference of the bottle, and the shadow image is erased by performing a logical product operation on the two images. Provided is a method for inspecting a foreign matter defect in a heel portion of a bottle, which is characterized by determining the presence or absence of a foreign matter by detecting the presence or absence of a foreign matter image.
Further, the mechanism for rotating the bottle is a mechanism for rotating while moving the bottle, and the lighting device has a width of at least one round of the bottle and a height sufficient to pass through the bottle heel portion. What is provided is a method. Furthermore,
The mechanism for rotating the bottle is a mechanism for rotating the bottle while the bottle is stationary, and the lighting device has a width around the diameter of the bottle body and a height sufficient to allow the bottle heel portion to pass through. There is provided a method. The present invention provides a method of limiting the field of view of an image by windowing the image. There is also provided a method characterized in that the image of only the foreign matter, or the image of the shadow produced by the foreign matter and the wall thickness of the bottle or the variation of the wall thickness is widened by a logical filter. Furthermore, there is also provided a method of determining a defective bottle when a certain number or more of the foreign object images are detected. In the present invention, the CCD camera may be a one-dimensional or two-dimensional CCD camera as long as it is within the light emitting / receiving area.

[0005]

[Operation] CC integrated with each mirror device
By appropriately arranging the D camera, the bottle which is the subject, the light projecting angle of the illuminating device for transmitting the same, and the light receiving angles of the two CCD cameras for each bottle type, the wall thickness of the bottle or its By performing a logical product operation, preferably a window process and an in-window inspection process on the image of the shadow of the light received due to the uneven thickness caused by the fluctuation, it is possible to effectively and stably inspect the heel part foreign matter defect of the bottle.

[0006]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a schematic explanatory view for planarly explaining a bottle carrying method showing an outline of an embodiment of the present invention. FIG. 2 is a schematic side view showing the positional relationship between the illumination device, the bottle and the mirror device, and the CCD camera used in the embodiment of the present invention. FIG. 3 is an explanatory diagram illustrating the relationship between the bottle, the mirror device, and the CCD camera. FIG. 4 is a system block diagram showing an outline of an embodiment of the present invention. FIG. 5 is an explanatory diagram for explaining the operation timing of the system. Figure 6
FIG. 4 is an explanatory diagram illustrating image processing for one scan of CAM1 and CAM2. FIG. 7 is an explanatory diagram illustrating image processing when the entire circumference of the heel portion is scanned.

As shown in FIG. 1, the pre-inspection bottle 18 flowing on the bottle conveying line 19 is introduced into the present inspection machine by the bottle introducing plate 97. At this time, the illumination device 8 is on. The inlet motor 1 has an inlet belt 10, the main motor 2 has a main belt 9, and the outlet motors 3 and 4 have an outlet belt 11,
12 are driven in the bottle moving direction at a constant speed.

As shown in FIG. 2, the bottle 6 to be inspected is rolled and moved by the mouth pressing plate 99, the heel pressing plate 100, and the main belt 9. At that time, the inspection is started by the start sensor 13 shown in FIG.

The inspection according to the present invention is processed in the procedure shown in the timing chart of FIG. Then, when the count value of the rotary encoder 20 shown in FIG. 2 reaches a set value of one rotation or more of the bottle, as shown in FIG.
4, the scan 55 of CAM1 and CAM2, the image acquisition, and the logical operation 56 are completed, and the result determination 57 is output.

Thereafter, as shown in FIG. 1, the bottle 6 to be inspected is
The END signal 53 passing through the end sensor 14 and shown in FIG.
Is generated, and the inspection process ends.

The outlet belts 11 and 12 shown in FIG.
Thus, the bottle is returned to the bottle transport line 19. When the result determination 57 shown in FIG. 5 is NG, the discharge air nozzle 15 moves and discharges it onto the turntable 16.

Next, the process after the start of the inspection will be described in more detail with reference to FIG. 3. The bottle 6 to be inspected at the inspection position is transmitted by the illumination device 8, and the transmitted light has a mirror device 28 having a different viewing angle. The light enters the cameras 21 and 22 through the camera lenses 33 and 34 via 29. Then camera 2
The inspection visual fields 27 of Nos. 1 and 22 are between the bottle body and the bottle bottom as shown in FIG. 3, and the mirror devices 30 and 31 are mirror control means so that they are always near the center of the bottle even if the bottle rolls and rotates. It is suppressed by 39.

Next, referring to FIG. 6, the image signal of one scan incident on the cameras 21 and 22 and the detection of the virtual NG 79 in the scan will be described. The image signal 68 of the camera A and the image signal 69 of the camera B are sampled for the inspection visual field 27, and the windows 72 and 73 of the camera A and the camera B are collected.
If the portions of the image signals in the windows 74 and 75 of No. 1 and 2 below the respective slice values 70 and 71 are set to virtual NG and the display is set to 76 to 78 respectively, CAM1 and CAM
The virtual NG 79 is detected by taking the logical product of the two virtual NG images.

Further, in the present embodiment, the accuracy is improved by performing the scan of the heel part for one round of the bottle and the signal processing thereof. This will be described with reference to FIG. In FIG. 7, the CAM1 continuous scan result display 80, C is displayed in order from the top.
An AM2 continuous scan result display 81, a logical product calculation result display 82, and a judgment value comparison result display 83 are displayed, and the NG detection process is expressed. Here, the number of scans for each of CAM1 and CAM2 depends on the bottle diameter, but it is usually 4
The resolution is set to about 0.00 to 1000, and the resolution is 0.
It is 3 to 0.5 mm. CAM 1 and 2 continuous scan result displays 80 and 81 are examples of drink bottles having a bottle diameter of about 45 mm. The shadow of the transmitted light due to the flesh of the bottle is the heel shadow 85,
86, 101, 102 and the like, and the foreign matters are expressed by heel foreign matters 89, 93.

In the present embodiment, further widening processing is performed. That is, the heel foreign matter 89, 93 should be represented at the same position in the CAM 1, 2 continuous scan result displays 80, 81, but in reality, the detected position is displaced due to an error in the position of the mirror, mounting of the camera, or the like. In some cases, the widening processes 88 and 92 are performed on the scan detection images 80 and 81 of the CAMs 1 and 2. As a result, as shown in the logical operation result display 82 which is the foreign matter in the heel portion, it is possible to prevent the accuracy from deteriorating due to the detected position shift.

Further, in the present embodiment, the attached dust removing process is further performed. This is because the adhered dust 95 can be removed by setting the judgment value parameters 2 to 5 for the image of the logical product calculation result display 82, and the result is as shown in the judgment value comparison result 83. NG96 is displayed and it is determined that the bottle is defective.

Heel portion shadows 85, 86, 101, 10 which are shadows projected on the heel portion due to the wall thickness change and deformation of the bottle.
2 is the scan detection images 80 and 81 of CAMs 1 and 2, and CAMA 21 that does not overlap is
This is because the CAMB 22 has a different light-receiving angle, that is, a camera-B light-receiving angle 24 and a camera-A light-receiving angle 23, which are important elements for performing the series of processes. The camera light receiving angle 24 is preferably 50 degrees, and the camera light receiving angle 23 is preferably about 60 degrees.

According to the present invention, in a bottle making or bottle filling factory, it is possible to automatically and continuously perform high speed and stable foreign matter defects such as stones, metal fragments and other foreign matter defects on the heel of the bottle. It is possible to prevent breakage and cracking of the bottle due to vibration of transportation or the like due to insufficient strength of the bottle, which is a serious defect of the final product.

[Brief description of drawings]

FIG. 1 is an explanatory view for planarly explaining a bottle carrying method showing an outline of an embodiment of the present invention.

FIG. 2 is a side view illustrating a positional relationship among a lighting device, a bottle and a mirror device, and a CCD camera used in an embodiment of the present invention.

FIG. 3 is an explanatory diagram illustrating a relationship among a bottle, a mirror device, and a CCD camera.

FIG. 4 is a system block diagram showing an outline of an embodiment of the present invention.

FIG. 5 is an explanatory diagram illustrating an operation timing of the system.

FIG. 6 is an explanatory diagram illustrating image processing for one scan of CAM1 and CAM2.

FIG. 7 is an explanatory diagram illustrating image processing when the entire circumference of the heel portion is scanned.

[Explanation of symbols]

 1 inlet motor 2 main motor 3,4 outlet motor 5 discharge turntable motor 6 bottle to be inspected 7 heel field of view hole 8 lighting device 9 main belt 10 inlet belt 11, 12 outlet belt 13 start sensor 14 end sensor 15 discharge air nozzle 16 Turntable 17 Inspection completed bottle 18 Pre-inspection bottle 19 Transfer line 20 Rotary encoder 21 Camera A 22 Camera B 23 Camera B light receiving angle 24 Camera A light receiving angle 25 Bottle rotation 26 Bottle moving direction 27 Inspection field of view 30 Camera A mirror 31 Camera B mirror 32 mirror JOG direction 33 camera A lens 34 camera B lens 35, 36 origin sensor 37, 38 origin slit 39 mirror control means 40 bottle transport control means 41 connection cable 42 external input / output means 4 Timing means 44 Camera up / down means 45 Image compression means 46 Window means 47 Logical operation means 48 Result determination means 49 Screen display control means 50 Screen display means 51 KEY input means 52 Start signal 53 END signal 54 Mirror follower 55 Cameras A, B Scan 56 Logical operation 57 Result determination output 58 Mirror following timing 59 CAM1, 2 scan timing 60 Logical operation processing timing 61 CAM1, 2 scan end timing 62 Logical operation end timing 63 Result determination output timing 64, 66 Level 65, 67 Sensor element direction 68, 69 Received light signal 70, 71 Slice value 72, 74 Window start 73, 75 Window end 76, 77, 78 Virtual NG display 79 Virtual NG 80 CAM1 continuous scan result display 1 CAM2 continuous scan result display 82 logical operation result display 83 judgment value comparison result 84 1 scan result 85, 86 heel shadow 88, 92 widening processing 89, 93 foreign matter 90 shadow 91 foreign matter 94 logical operation result 95 adhering dust 96 determination result NG 97 Bottle introduction plate 98 Bottle moving direction 99 Mouth holding plate 100 Heel holding plate 101, 102 Heel shadow

Claims (6)

[Claims] 1. A method for inspecting a foreign matter defect of a heel portion of a bottle, wherein a mechanism portion for introducing the bottle from a production line which is a well-known bottle conveying means, a mechanism portion for rotating the bottle one rotation or more, and a bottle on the production line. The mechanism part for returning to the bottle and the illuminating device having a sufficient amount of light to pass through the heel part of the bottle from the diagonal direction of the bottle are arranged, and the heel part of the bottle is sandwiched between the illuminating device and the opposite side of the illuminating device. First and second follower mirror devices are provided, and the first mirror device is about 30 degrees to the horizontal plane.
The second mirror device is arranged at an angle of about 70 degrees, and the second mirror device is arranged at a different angle, and the same portion of the heel portion of the bottle projected on each mirror is duplicated for each mirror.
By capturing the image of only the foreign substance, or the image of the foreign substance and the image of the thickness of the bottle or the shadow caused by the variation of the thickness with the CCD camera of the stand over the entire circumference of the bottle, and performing the logical product operation of the two images. A method for inspecting a foreign matter defect in a heel portion of a bottle, which comprises erasing a shadow image and determining the presence or absence of a foreign matter by detecting the presence or absence of a foreign matter image. 2. The mechanism for rotating the bottle is a mechanism for rotating the bottle while moving the bottle, and the lighting device has a width equal to or more than one round of the bottle and a height sufficiently high to pass through the bottle heel portion. The method of claim 1, wherein the method has a height. 3. The mechanism for rotating the bottle is a mechanism for rotating the bottle while the bottle is stationary, and the lighting device is sufficiently high to allow the width around the bottle barrel diameter and the bottle heel portion to pass through. The method of claim 1, wherein the method has a height. 4. A method according to claim 1, wherein the field of view of the image is limited by subjecting the image to an image processing window. 5. The method according to claim 1, wherein an image of only the foreign matter, or an image of a shadow caused by the thickness of the foreign matter and the bottle or a variation in the thickness of the bottle is widened by a logical filter. 6. The method according to any one of claims 1 to 3, wherein a defect bin is determined when a certain number of foreign object images are detected.