JP4253228B2 - Lid displacement inspection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lid misalignment inspection apparatus for inspecting misalignment of a lid that closes a container body.
[0002]
[Prior art]
Conventionally, desserts such as yogurt have been formed by closing them with a lid after being accommodated in a container.
[0003]
When performing such a lid misalignment inspection of a dessert container, light is irradiated from above the dessert container and an image from directly above is acquired by a camera. Then, the edge of the outer shape of the dessert container is obtained from this image, the center position is detected from this edge, and the polar coordinates are developed to detect the lid misalignment portion.
[0004]
[Problems to be solved by the invention]
However, such a conventional lid displacement inspection apparatus has a problem that it cannot be detected unless there is a clear density difference between the container body and the lid body .
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, in the lid misalignment inspection apparatus of the present invention, the lid of the work in which the peripheral edge of the lid is fixed to the transparent flange extending laterally from the opening edge of the container body. A displacement inspection apparatus , an irradiation unit that irradiates light from below the buttocks, an image acquisition unit that acquires an image from above the workpiece, and an image acquired by the image acquisition unit using polar coordinates And an image processing means for inspecting the lid displacement width from the width dimension of the portion indicating the lid displacement portion.
[0007]
That is, in this lid misalignment inspection apparatus, light is applied from below to the buttocks of the container body, and an image of the container body is acquired from above by the image acquisition means.
[0008]
At this time, the peripheral portion of the lid is fixed to the transparent collar, and the transmittance of light from the irradiation unit is different between the portion where the lid is fixed and the portion where the lid is not fixed. Images with different contrasts are acquired.
[0009]
This image is developed in polar coordinates by the image processing means, and the lid displacement width is inspected from the width dimension of the portion indicating the lid displacement portion acquired as the bright portion.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, position embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a lid displacement inspection apparatus 1 according to the present embodiment, and the lid displacement inspection apparatus 1 is installed in a production line for yogurt as an example of dessert.
[0011]
In this production line, after storing yogurt in an empty container body 11, the upper opening 12 is closed with a lid body 13 to produce a dessert container 14 as a work. It is conveyed to the next process.
[0012]
As shown in FIG. 1 (b), the container body 11 is formed of a transparent plastic, and includes a circular bottom surface 21 and a cylindrical side surface 22 standing above the periphery of the bottom surface 21. It is formed in an upper opening shape. A flange 23 extending laterally is formed from the upper edge of the side surface 22, and the flange 23 having transparency is formed on the entire periphery of the opening edge of the upper opening 12. Has been.
[0013]
The upper opening 12 is closed by a film-like lid 13, and the lid 13 is fixed in a state where the peripheral edge is placed on the flange 23. The lid 13 is printed, and the lid 13 is opaque.
[0014]
On the side of the conveyor 15, as shown in FIG. 1 (a), four illuminations 32,... As irradiation means are arranged around a predetermined inspection point 31, and the conveyor A sensor (not shown) is provided for detecting that the dessert container 14 on 15 passes the inspection point 31. As shown in FIG. 1B, each of the lights 32,... Is provided at a lower position than the flange 23 of the dessert container 14 conveyed by the conveyor 15. It arrange | positions so that light can be irradiated toward a lower surface.
[0015]
Further, as shown in FIG. 1 (a), an image acquisition means for acquiring an image by photographing the dessert container 14 from directly above, just above the inspection point 31 set on the conveyor 15. A camera 41 is installed.
[0016]
An image photographed by the camera 41 is sent to an image processing device 52 as an image processing means via a cable 51. In the image processing device 52, the dessert container 14 is sent in response to a signal from the sensor. Every time the inspection point 31 is passed, an image is acquired and analyzed.
[0017]
In this analysis process, as shown in FIG. 2 (a), an image 61 input from the camera 41 is developed in polar coordinates by a known processing procedure as shown in FIG. The outer shape of the dessert container 14 is converted into a linear shape to obtain a polar coordinate developed image 62, and the lid displacement width is inspected from the width dimension 64 of the bright portion 63 indicating the lid displacement portion.
[0018]
At this time, the development center of polar coordinate development is the center 71 of the acquired image 61. The dessert container 14 is set so that the center of the camera 41 is conveyed by a sensor and a guide provided on the conveyor 15.
[0019]
In this Embodiment concerning the above structure, light is applied to the collar part 23 of the dessert container 14 which passes the test | inspection point 31 from below by each illumination 32, ..., The container body 11 of this dessert container 14 The image is acquired from above by the camera 41.
[0020]
At this time, the peripheral portion of the opaque lid 13 is fixed to the collar 23 having transparency, and light from each illumination 32,... Is fixed at the portion where the lid 13 is fixed. While the transmission of light is blocked, light from each of the illuminations 32,.
[0021]
As described above, the transmittance of light from each of the illuminations 32,... Is different between the portion where the lid 13 is fixed and the portion where the lid 13 is not fixed, and is acquired by the camera 41 as an image 61 having a different contrast.
[0022]
This image 61 is developed in polar coordinates by the image processing device 52, and a polar coordinate developed image 62 is obtained as shown in FIG. And in the lid deviation part acquired as light part 63 with the light from the transmitted illumination 32, ..., the width dimension 64 is measured, the lid deviation width is inspected, and this lid deviation width is equal to or larger than the set value. In this case, a signal indicating a lid misalignment is output to the downstream sorting device.
[0023]
At this time, when a deviation occurs between the center of the container body 11 and the development center at the time of polar coordinate development, a polar coordinate development image 62 having a waveform is obtained as shown in FIG. Even in such a case, the lid displacement width can be measured from the width dimension 64 at the lid displacement portion acquired as the bright portion 63.
[0024]
In this way, it is possible to acquire images 61 having different contrasts between the portion where the lid body 13 is fixed to the collar portion 23 and the portion where the lid body 13 is not fixed. Then, this image 61 is developed in polar coordinates, and the lid displacement width can be inspected from the width dimension 64 of the portion indicating the lid displacement portion acquired as the bright portion 63.
[0025]
Therefore, even when the misalignment occurs in the dessert container 14 with respect to the conveyor 15 as in the conventional case where the center position needs to be detected by obtaining the edge of the outer shape from the image acquired from directly above, the lid Deviation can be inspected. Therefore, even when the dessert container 14 is not accurately placed at the center of the conveyor 15 in the course of transporting the dessert container 14 to the next process by the conveyor 15, the lid displacement can be reliably inspected.
[0026]
In addition, image processing of the dessert container outer edge 14 is not necessary, and an image in which only the lid displacement portion to be inspected is emphasized can be obtained. In addition, illumination for illuminating the outer edge of the dessert container 14 is also unnecessary.
[0027]
【The invention's effect】
As described above, in the lid misalignment inspection apparatus of the present invention, it is possible to acquire images having different contrasts between a portion where the lid of the buttock is fixed and a portion where the lid is not fixed. Then, this image is developed in polar coordinates, and the lid displacement width can be inspected from the width dimension of the portion indicating the lid displacement portion acquired as the bright portion.
[0028]
Therefore, even when the displacement of the workpiece occurs, the lid displacement can be inspected as in the conventional case where it is necessary to obtain the edge of the outer shape from the image acquired from directly above and detect the center position. . Therefore, even when the work is not accurately arranged at the center of the conveyor on the way along which the work is transported to the next process by the conveyor, the lid displacement can be reliably inspected.
[0029]
In addition, image processing on the outer edge of the work is not necessary, and an image in which only the lid displacement portion to be inspected is emphasized can be obtained. In addition, illumination that illuminates the outer edge of the workpiece is not required.
[Brief description of the drawings]
FIG. 1 is a schematic view showing an embodiment of the present invention, in which (a) is a plan view and (b) is a front view.
2A and 2B are explanatory diagrams showing a processing procedure in the image processing apparatus according to the embodiment, where FIG. 2A is an image acquired by a camera, FIG. 2B is a polar coordinate developed image obtained by polar coordinate development, and FIG. It is a polar coordinate development image when a shift occurs between the center of the body and the development center at the time of polar coordinate development.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cover displacement inspection apparatus 11 Container body 13 Cover body 14 Dessert container 23 Gutter part 32 Illumination 41 Camera 52 Image processing apparatus 63 Bright part 64 Width dimension

Claims (1)

A lid displacement inspection device for a workpiece in which a peripheral edge portion of a lid body is fixed to a flange portion having transparency extending laterally from an opening edge of a container body,
Irradiating means for irradiating light to the buttock from below the buttock;
Image acquisition means for acquiring an image from above the workpiece;
An image processing means for inspecting the lid displacement width from the width dimension of the part indicating the lid displacement portion, while developing the polar coordinates of the image obtained by the image obtaining means,
A lid misalignment inspection apparatus comprising:

Images