JPH10239249A - Inspection device for outer periphery face of can lid and can-lid inspection and processing apparatus provided with it as well as inspection method for outer periphery face of can lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inspection device which prevents a defective can from being generated due to the oversight of a defect and by which only a defective can lid is excluded automatically and selectively by a method wherein the outer periphery face of a plurality of piled-up can lids is photographed collectively in the axial direction of the can lids and the can lids are photographed continuously while they are being turned. SOLUTION: By a rotation mechanism 29, a can lid 25, in a stacked state, which is housed inside a sleeve 23 is sandwiched between gripping members 30, and it is turned around the axial line of a plurality of can lids 11. A line sensor camera 81 collectively photographs the outer periphery face of the plurality of can lids 11 in the axial direction and in a line shape regarding the whole can lid 25. By one rotation of the can lid 25, the defect inspection of the outer periphery face of the plurality of can lids 11 is finished. Image information which is fetched by the line sensor camera 81 is sent to an image processing part 31, and the image information is stored as a function of time. In addition, the image information is processed, and it is converted into the function of a position corresponding to the position of the outer circumferential face of the plurality of can lids 11 so as to be stored. In order to judge whether a defect exists or not, a threshold is processed. By the above process, the existence and the position of the defect on the outer circumferential face of the plurality of can lids are specified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for inspecting a defect on an outer peripheral surface of a can lid and automatically removing a defective can lid having a defect on the outer peripheral surface, and a method for inspecting an outer peripheral surface of a can lid. .

[0002]

2. Description of the Related Art FIG. 5 is a schematic diagram in which the vicinity of the outer periphery of a can lid 1 is enlarged. A curl portion 1a for winding the can lid 1 around the can body is provided near the outer peripheral surface of the can lid 1. If the curl portion 1a has a defect, for example, a crush, it may cause a defective can. For this reason, it is necessary to remove the can lid 1 in which the curled portion 1a is determined to be defective.
For example, a detection device disclosed in Japanese Patent Publication No. 5-71883 detects a defect in the curled portion 1a.
FIG. 6 shows a detection device disclosed in the above-mentioned publication. This detection device A generally includes a signal processing unit (not shown) including a ring sensor 2, a level comparison circuit, an amplifier, and the like.
It is composed of

The ring sensor 2 is provided with a plurality of detection sensors 5 each composed of a set of a light projecting unit 3 and a light receiving unit 4 all around the inner surface 2a. Using such an apparatus A, the can lid 7 in a stacked state in which the can lids 1 are vertically stacked.
Is passed through the inside of the ring sensor 2 in the vertical direction, and each detection sensor 5 detects a defect of the curled portion 1a on the outer peripheral surface of the can lid 1 to detect a defective can lid.

[0004]

However, in the curl leak cover detecting device A, the detecting sensor 5 is connected to the inner circumference 2a.
And a so-called point inspection or sampling inspection in which only the position of the outer peripheral surface of the can lid corresponding to the position where the detection sensor 5 is provided can be inspected. Therefore, even if the sensors 5, 5,
.. Even if a large number of... Are provided.
And in the inspection method using the same, there is essentially no possibility that a defect on the outer peripheral surface of the can lid is overlooked.

In order to solve the problem of the occurrence of defective cans due to the oversight of defects as described above, the inspection apparatus and method for inspecting the outer peripheral surface of a can lid according to the present invention employ a method for inspecting the outer peripheral surface of a can lid. It is an object of the present invention to provide means capable of inspecting all locations on the outer peripheral surface, and to prevent the occurrence of defective cans due to oversight of defects. In addition, in the inspection apparatus and the inspection method for the outer peripheral surface of the can lid according to the present invention, only the defective can lid is automatically selectively removed according to the inspection result, and the non-defective can lid is removed. An object of the present invention is to provide a can lid inspection processing device capable of sending a lid to the next step.

[0006]

Means for Solving the Problems In order to solve the above problems, the following means have been taken in the inspection apparatus for the outer peripheral surface of a can lid according to the present invention. That is, in the inspection apparatus for an outer peripheral surface of a can lid according to claim 1, a sleeve for stacking a plurality of can lids and collectively storing the cans, and a laminated can lid stored in the sleeve. A rotating mechanism for rotating around the axis of the can lid, and an imaging unit that collectively photographs the outer peripheral surface of the can lid rotated by the rotating mechanism in a line extending in the axial direction of the can lid. And an image processing unit for processing an image photographed by the photographing unit to detect a defect on the outer peripheral surface of the can lid.

In the inspection device for the outer peripheral surface of the can lid,
The outer peripheral surface of a plurality of stacked can lids is collectively photographed by the photographing unit in a line extending in the axial direction of the can lid. Then, the photographing is continued while rotating the can lid around its axis by the rotation mechanism. Thus, the entire outer peripheral surface of the stacked can lids is photographed within a fixed time until the can lid is rotated once. Then, the photographing data is subjected to image processing by the image processing unit to detect a defect on the outer peripheral surface of the can lid.

According to a second aspect of the present invention, there is provided an inspection apparatus for inspecting an outer peripheral surface of a can lid according to the first aspect, wherein the image processing unit is configured to perform the inspection on the outer peripheral surface of the can lid based on image data. A defect detection mechanism for detecting the presence or absence of a defect on the outer peripheral surface of the can lid, and identifying a difference in image data between the ridges and valleys of the outer peripheral surface caused by the lamination of the can lids, and the position of the defective can lid where the defect exists. And a defective can lid position specifying mechanism for specifying the position. In the inspection device for the outer peripheral surface of the can lid, the defect detection mechanism detects the presence or absence of a defect on the outer peripheral surface of the can lid, while the outer peripheral surface generated by stacking the can lid by the defective can lid position specifying mechanism. The difference between the image data of the ridge and the valley is identified. Then, the position of the defective can lid where the defect is detected on the outer peripheral surface by the defect detection mechanism is specified.

According to a third aspect of the present invention, there is provided a can lid inspection processing apparatus provided with the apparatus for inspecting an outer peripheral surface of a can lid according to the first or second aspect. The apparatus comprises: a defective can lid elimination unit that separates and transports the laminated can lids inspected by the inspection device for the outer peripheral surface of the can lid one by one, and removes only the defective can lids; A good-quality can lid storage section for storing the can lid. In this inspection apparatus for the outer periphery of a can lid, only the defective can lid in which a defect is detected on the outer peripheral surface of the stacked can lids is eliminated by the defective can lid removing unit. Then, only the good-quality can lid is stored in the good-quality can lid storage section.

In the method for inspecting the outer peripheral surface of a can lid according to the present invention, the outer peripheral surface of the can lid is collectively formed into a line extending in the axial direction while rotating the laminated can lid around its axis. Then, image processing of the photographed image information is performed to detect a defect on the outer peripheral surface of the can lid. According to this method for inspecting the outer peripheral surface of a can lid, the outer peripheral surface of the can lid in a laminated state can be inspected continuously and collectively.

According to a fifth aspect of the present invention, there is provided a method for inspecting an outer peripheral surface of a can lid according to the fourth aspect, wherein the outer peripheral surface of the can lid in a laminated state is provided with a ridge. Due to the difference in brightness between the corresponding image and the image corresponding to the valley,
The position of a defective can lid among the can lids in a stacked state is specified. According to this method of inspecting the outer peripheral surface of the can lid, considering the difference in brightness between the images corresponding to the ridges and the valleys, by associating the difference with the position where the defect actually exists, the layers are stacked. The position of the can lid where a defect exists among the can lids is specified.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The can lid inspection processing device B includes an inspection device C for inspecting the outer peripheral surface of the can lid 11 for inspecting the outer peripheral surface of the can lid 11, and a defect for discharging only a defective can lid inspected and determined to be defective by the device C. The main component is a can lid elimination section 15 and a good-quality can lid storage section 17 for storing other good-quality can lids.

Among them, the inspection device C for the outer peripheral surface of the can lid is:
The index turret 21, the transparent sleeve 23 gripped by the index turret 21, a revolving mechanism (not shown) for revolving the sleeve 23, and the outer periphery of the can lid 25 stacked in the sleeve 23 in a stacked state are photographed. Imaging unit 27, a rotation mechanism 29 for rotating (rotating) the stacked can lids 25 stacked in the sleeve 23, and processing the image information captured by the imaging unit 27 to form the can lid 11 And an image processing unit 31 for detecting a defect on the outer peripheral surface of the image forming apparatus.

In FIG. 1, X indicates an entrance position, Y indicates a defect inspection position, and Z indicates an exit position. In the entrance position X, the can lid 11 is lowered by being guided by the gap controller 33. Lowered can lid 1
The number 1 is counted by the number counting gear stopper 35. The can lids 11 separated one by one from the number counting gear stopper 35 are received one by one by the end descending guide 37, descend, and are stacked on the tray 41. This end descending guide 37
As shown by an arrow in FIG. 2, first, after being inserted below the can lid 11, it is lowered by receiving the bottom of the can lid 11 one by one, and after being pulled out from the bottom of the can lid 11 on the tray 41, To rise. By repeating this operation sequentially, the pan 4
A fixed number of can lids 11, for example, 40 cans can be stacked on 1, and the can lids 25 in a stacked state are formed on the tray 41.

Next, the shutter (not shown) provided on the receiving tray 41 is opened, and the bottom surface of the stacked can lid 25 is pressed by an end dropping elevating guide 45 to thereby close the stacked can lid 25. Are housed in a sleeve 23 provided below the same. Next, the index turret 21 is rotated by a revolving mechanism (not shown), and the can lid 25 in the stacked state is rotationally moved to the defect inspection position Y together with the sleeve 23. Then, FIG.
As shown by the arrow in FIG.
Rises again, returns to the original position, and waits for the next stacked lid 25. By repeating such operations, the stacked can lids 25 are sequentially sent out to the defect inspection position Y.

In the defect inspection position Y, the can lid 1
The defect inspection is performed on the outer peripheral surface of No. 1 to specify the position of the can lid having a defect on the outer peripheral surface of the stacked can lids 25 (for example, what number of can lids from the top are defective). . The can lid 25 in the stacked state after the completion of the defect inspection is rotated and moved to the delivery position Z together with the sleeve 23 accommodating it.

In the exit position Z, the shutter of the tray 41 is opened, and the bottom of the can lid 25 in the stacked state is received by the end discharge drop-down guide 51, and is taken out of the sleeve 23. It descends to the lower position Z1. The end discharge lowering and lowering guide 51 performs the same operation as the end lowering guide 37. .. In the stacked can lids 25 are dropped one by one onto the can lid transport passage 55 by the dispensing gear guide 53 and transported. Forming down stacker 6
Loaded in one. In this process, regarding the defective can lid having a defect among the can lids 11, the defective can lid elimination position 63 provided in the defective can lid elimination unit 15 according to the defect inspection result by the defect inspection device C. Discarded at

Next, inspection of a defect on the outer peripheral surface of the can lid will be described in detail with reference to FIG. As shown in FIG. 3, a rotation mechanism 29 is provided at the defect inspection position Y. The rotation mechanism 29 is configured to sandwich the can lid 25 housed in the sleeve 23 in a stacked state from above and below by a gripping member 30 and rotate the can lid 11 around the axis of the can lid 11.

On the other hand, a line sensor camera 81 is installed in the photographing section 27 disposed outside the sleeve 23. The line sensor camera 81 can collectively photograph the outer peripheral surface of the can lid 11 linearly in a direction extending in the axial direction, and collectively for all the number of stacked can lids 25. That is, with respect to the can axis direction, the range indicated by the two two-dot chain lines 87a and 87b, that is, the outer peripheral surfaces of all the can lids 11 forming the stacked can lids 25 can be collectively photographed. , The shooting range is set. In addition, as the line sensor camera 81 for imaging in such a line shape, for example, a charge-coupled device (CC)
In addition to a CCD line sensor camera in which D) is arranged in a line, a line sensor camera in which light receiving elements such as photodiodes (PD) are arranged in a line can also be used. Further, the line sensor camera 81 and the sleeve 2
A light 83 is provided between the light source 3 and the light source 3 to facilitate detection of a defect existing on the outer periphery 11 a of the can lid 11.
A slit 85 is provided in the sleeve 23 so as to extend in the can axis direction of the can lid 11. A part of the outer periphery 11a of the can lid 11 can be photographed by the line sensor camera 81 from the gap of the slit 85. Further, the slit 85 also serves to freely move the end dropping elevating guide 45 up and down in the sleeve 23.

Using the rotating mechanism 29, the can lid 25 in a stacked state is
While the camera is rotated, photographing of the outer peripheral surface of the can lid 11 is continuously performed using the line sensor camera 81. Laminated can lid 2
With one rotation of 5, all the defect inspections on the outer peripheral surface of the can lid 11 are completed.

The image information taken in by the line sensor camera 81 is sent to the image processing section 31, and the image information sequentially output from the line sensor camera 81 is stored as a function of time. The image information stored as a function of time is further processed, converted into a function of position corresponding to the position of the outer peripheral surface of the can lid 11, and stored.
Next, threshold processing or the like is performed on the image information stored as a function of the position to determine whether or not there is a defect. Through the above steps, the presence or absence of a defect and the position of the defect on the outer periphery of the can lid are specified.

FIG. 4 is a supplementary diagram for explaining the state of the image processing, and is a schematic diagram of an image in which the data processed by the image processing section 31 is actually output. In this figure, images 91, 91,...
The second image 9 is an image corresponding to the ridge of the first curl portion 11a (hereinafter, referred to as an “image corresponding to the ridge”).
Are images corresponding to valleys between the ridges (hereinafter referred to as “images corresponding to valleys”).

According to the intensity of the reflected light from the illumination 83, the image 91 corresponding to the ridge appears bright, while the image 93 corresponding to the valley appears dark. Since the can lid 25 in the stacked state is viewed, the images 91 corresponding to the ridges and the images 93 corresponding to the valleys are alternately arranged. Also,
A series of images 91 and 93 viewed in the vertical direction from the upper end to the lower end in FIG. 4 are images corresponding to one round of image information on the outer peripheral surface of one can lid 11. When looking at FIG. 4 in the horizontal direction, all the can lids 1 forming the stacked can lids 25 can be seen.
1 is an image of the outer peripheral surface. Therefore, by this image processing, the information on the entire number of the can lids 25 in a stacked state in which a large number of can lids 11 are stacked and for one round of the outer peripheral surface are continuously and collectively obtained by the image processing. It shows that it can be obtained.

If there is no defect on the outer peripheral surface of all the can lids 11 in the stacked can lids 25, an image 91 corresponding to the ridge portion which looks bright and an image corresponding to the valley portion which looks dark. 93 are alternately and regularly arranged. If there is any defect on the outer peripheral surface of the can lid 11, some irregularity will appear in the regular bright and dark image. For example, in the above image, reference numeral 101
The image of the dark portion shown in FIG. 1 indicates the presence of a defect corresponding to the stain on the outer peripheral surface of the can lid 11 (contamination of the outer peripheral portion),
The image of the dark portion indicated by 03 is a defect in which the curl portion 11a is missing (curl lack), and the dark portion indicated by the reference numeral 105 is a defect (damage curl) corresponding to the damage of the curl portion 11a, and denoted by reference numeral 107. The irregular image shown is a defect (wrinkle curl) caused by wrinkling of the curl portion 11a, and the irregular image shown by reference numeral 109 is a defect (curl portion flaw) caused by a flaw in the curl portion 11a. Yes, it is. As described above, the irregular image data due to the defect existing in the bright and dark regular image data is detected by the defect detection mechanism 31a, and the presence or absence of a defect on the outer peripheral surface of the can lid 11 is detected.

Further, as shown in FIG. 4, since the difference between light and darkness is clear between the image 91 corresponding to the ridge and the image 93 corresponding to the valley, the difference is determined by the defective can lid position specifying mechanism 31b. That is, by actually counting the number of images 93 corresponding to the dark valleys, and by associating the number with the position of the can lid where the defect was detected by the defect detection mechanism 31a, Of the can lids 25 in the state, it is possible to specify which of the can lids 11 has a defect on the outer peripheral surface, that is, which of the can lids is a defective can lid.

In an actual process, the image photographed by the line sensor camera 81 is internally processed by the image processing unit 31 and the information on the presence or absence and the position of the obtained defect is converted into an electric signal, and the defective can lid elimination unit 15 is used. By automatically transmitting the data to a control unit (not shown) provided in the apparatus, the defective can lid is automatically eliminated. Therefore, it is not necessary to output and analyze the image as shown in FIG. 4 once outside.

As described above, by using the inspection apparatus for the outer peripheral surface of the can lid of the present invention, a plurality of can lids 11, 11,
.. Are stacked, it is possible to inspect the outer periphery of the can lid 11 continuously and collectively in a line. As a result, the possibility of overlooking the above-mentioned defect often seen in the conventional defect inspection means has been drastically reduced.

Further, by using the apparatus for inspecting the outer peripheral surface of a can lid and the apparatus for inspecting the can lid provided with the same according to the present invention, the inspection of the outer periphery of the can lid and the step of eliminating defective can lids having defects can be performed quickly and quickly. Since it can be performed automatically, can manufacturing costs have been reduced, and the defect rate of the can itself due to defective tightening caused by defects in the can lid has been significantly reduced.

[0029]

As described above, the apparatus for inspecting the outer peripheral surface of a can lid according to the present invention has the following effects. That is, in the inspection apparatus for the outer peripheral surface of the can lid according to the first aspect, the defects on the outer peripheral surface of the plurality of can lids can be collectively and continuously inspected in a line, and the defect on the outer peripheral surface of the can lid can be inspected. Will not be overlooked. Along with this, the defect rate of the can itself due to poor tightening of the can lid is greatly reduced.

In the inspection apparatus for the outer peripheral surface of the can lid according to the second aspect, the position of the defective can lid having a defect on the outer peripheral surface among the laminated can lids can be specified. In the can lid inspection processing device according to the third aspect, it is possible to automatically select and store only good can lids based on the defect inspection result. Therefore, if this can lid inspection processing device is used, it is possible to automate a series of steps of detecting defects on the outer peripheral surface of the can lid, selecting only good can lids, and sending the same to the next step. Inspection and processing steps become easier.

In the inspection method of the outer peripheral surface of the can lid according to the fourth aspect, the outer peripheral surface of the laminated can lid can be inspected continuously and collectively. In the inspection method of the outer peripheral surface of the can lid according to the fifth aspect, it is easy to specify the position of the can lid where a defect is found among the stacked can lids. Therefore, if these inspection methods for the outer peripheral surface of the can lid are used, it becomes easy to detect a defect on the outer peripheral surface of the can lid and further specify the position of the defect.

[Brief description of the drawings]

FIG. 1 is a plan view of a can lid inspection processing device using an inspection device for an outer peripheral surface of a can lid shown as an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the can lid inspection processing apparatus using the inspection apparatus for the outer peripheral surface of the can lid shown as one embodiment of the present invention, and is a cross-sectional view taken along the line FOF of FIG. .

FIG. 3 is a side sectional view of the inspection device of the outer peripheral surface of the can lid shown as one embodiment of the present invention, and is a sectional view taken along line GG of FIG.

FIG. 4 is an auxiliary drawing for explaining one process of the inspection method of the outer peripheral surface of the can lid shown as one embodiment of the present invention, and is a schematic diagram showing an example of a photographed image.

FIG. 5 is an enlarged side view of the vicinity of a curled portion of a can lid.

FIG. 6 is a perspective view of a conventional inspection device for an outer peripheral surface of a can lid using a ring sensor.

[Explanation of symbols]

 B: can lid inspection processing apparatus C: inspection apparatus for the outer peripheral surface of the can lid 11: can lid 11a: curled portion 15: defective can lid elimination section 17: good-quality can lid storage section 23: sleeve 25: stacked can lid 27 ... Photographing unit 29 ... Rotating mechanism 31 ... Image processing unit 31a ... Defect detection mechanism 31b ... Defective can lid position specifying mechanism

Claims (5)

[Claims] A sleeve for stacking a plurality of can lids and collectively storing the cans; a rotating mechanism for rotating the stacked can lids housed in the sleeve around an axis of the can lid; A photographing unit that collectively photographs the outer peripheral surface of the can lid rotated by the rotating mechanism in a line extending in the axial direction of the can lid, and processes an image photographed by the photographing unit. An inspection apparatus for an outer peripheral surface of a can lid, comprising an image processing unit for detecting a defect on the outer peripheral surface of the can lid. 2. The inspection device for an outer peripheral surface of a can lid according to claim 1, wherein the image processing unit detects a defect on the outer peripheral surface of the can lid based on image data. A defective can lid position specifying mechanism for identifying a difference in image data between the ridge and the valley of the outer peripheral surface caused by the lamination of the can lid and specifying the position of the defective can lid having a defect. An inspection device for an outer peripheral surface of a can lid. 3. A can lid inspection processing device comprising the can lid inspection device according to claim 1 or 2, wherein the can lid inspection processing device inspects the outer periphery surface of the can lid. A defective can lid elimination unit that separates and transports the laminated can lids inspected by the apparatus one by one and removes only the defective can lids, and a good product can lid storage unit that stores other good product can lids. A can lid inspection processing device comprising: 4. An outer peripheral surface of the can lid is collectively photographed in a line extending in the axial direction while rotating the laminated can lid around its axis, and the photographed image information is subjected to image processing. A method for inspecting the outer peripheral surface of the can lid by detecting a defect on the outer peripheral surface of the can lid. 5. The method for inspecting an outer peripheral surface of a can lid according to claim 4, wherein a difference between an image corresponding to a ridge and an image corresponding to a valley in the outer peripheral surface of the can lid in a stacked state is determined. ,
A method for inspecting an outer peripheral surface of a can lid, characterized by specifying a position of a can lid having a defect among stacked can lids.