JP2003262511A - Method of measuring and inspecting bottle can - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely measure and inspect the threaded part of a bottle can. <P>SOLUTION: An image processing section picks up the image of the threaded part 33 of the bottle can 30 set on a measuring table and finds the coordinate position of the projecting end 37a of a screw thread of the threaded part 33 in the measuring area K of the picked-up image data. When the can 30 is successively rotated to the final angle in the peripheral direction of the can 30 at preset prescribed intervals, the projecting end 37a of the screw thread moves as the can 30 is rotated and the measuring area K follows the movement of the projecting end 37a. At every rotation, the coordinate position of the projecting end 37a of the screw thread of the threaded part 33 in the measuring area K is found. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring and inspecting method, and more particularly to a technique for measuring a bottle can made of aluminum or its alloy.

[0002]

2. Description of the Related Art A metal bottle can (hereinafter simply referred to as a bottle can) is formed by drawing a metal plate made of aluminum or an aluminum alloy and then ironing it. Therefore, it is generally called a DI can.

Such bottle cans are now widely used as beverage cans. After being formed from a metal plate into a cylindrical can body with a bottom, the diameter of the upper part is reduced (neck-in processing). As a result, a mouthpiece having a diameter smaller than the diameter of the can body is formed, and then a screw portion for attaching the cap to the mouthpiece is formed.

[0004]

By the way, in recent years, as the demand for bottle cans has increased, it is required to measure bottle cans in order to achieve higher quality and more uniform quality. However, since the bottle cans such as those made of aluminum have a cylindrical shape, the surrounding positions are not clearly distinguished,
Further, since it is thin and has a flexibility and is DI-processed, and further, after forming the mouthpiece by neck-in processing the can body, the screw part is provided on the mouthpiece, so that the axis line of the can body and the axis line of the mouthpiece are misaligned. However, there is a problem in that variations occur in the formed screw portion, that is, variations in the threads and valleys of the screw portion.
In order to solve this problem, it is possible to inspect the screw part of the bottle can and correct the processing of the screw part based on this inspection result, but it is a manual method using a general two-dimensional shape measuring machine. However, the actual situation is that no effective and appropriate method for testing other than the above has been provided.

The present invention has been made in view of the above circumstances, and an object thereof is to measure the threaded portion of a bottle can surely and to improve the quality of the bottle can. To provide an inspection method.

[0006]

In order to achieve the above object, the present invention proposes the following means. In the invention according to claim 1, a metal bottle can having a cap with a threaded portion formed on its outer peripheral surface is set on a measuring table, and the bottle can is rotated about its axis while A method for measuring and inspecting a bottle can, wherein a contour line of the bottle can is imaged from the side by an imaging means, and the screw portion is measured and inspected based on the imaged data. B. A measurement area is set in a portion corresponding to the screw starting portion in a state where the screw starting portion of the screw portion appears on the contour line; While obtaining the coordinates of the thread crest tip and the thread trough that are displaced as the bottle can rotates, the measurement region is displaced at a constant interval so as to follow the thread crest tip and the thread trough, and C.I. It is characterized in that the threaded portion is measured and inspected based on the coordinate data of the thread crest tip and the thread trough.

According to the measuring and inspecting method of the present invention, while the coordinates of the thread crests and the thread troughs that are displaced with the rotation of the bottle can are obtained, the measurement area is set at regular intervals at the thread crests and the thread troughs. When you displace in accordance with, the coordinate data of the thread crest tip and the thread trough is obtained from the measurement area, and the screw part is measured and inspected based on the coordinate data, so the screw part of the bottle can be surely measured and inspected. Therefore, the measurement and inspection of the screw portion can be performed well.

According to a second aspect of the present invention, in the measurement and inspection method according to the first aspect, the screw strain is measured and inspected based on the coordinate data of the thread crest tip and the thread root.

According to the measuring and inspecting method of the present invention, the screw strain is measured and inspected based on the coordinate data of the thread crest tip and the thread trough, so that the screw strain can be satisfactorily inspected.

According to a third aspect of the present invention, in the measurement and inspection method according to the first aspect, the inclination angle of the screw is measured and inspected based on the coordinate data of the thread crest tip and the thread root.

According to the measuring and inspecting method of the present invention, the inclination angle of the threaded portion of the bottle can can be reliably measured, so that the inclination angle of the threaded portion can be satisfactorily measured and inspected.

According to a fourth aspect of the present invention, in the measurement and inspection method according to the first aspect, the number of screw turns is measured and inspected based on the coordinate data of the thread crest tip and the thread root.

According to the measurement / inspection method of the present invention, the number of screw turns is measured based on the coordinate data of the thread crest tip and the screw root, so that the measurement and inspection of the number of screw turns can be satisfactorily performed.

The invention according to claim 5 is the method for measuring and inspecting a bottle can according to claim 1, wherein Instead of setting, the measurement area is set in a portion corresponding to the screw portion that appears on the contour line, and the bottle can is near the screw end of the screw portion that appears on the contour line based on a specified number of screw turns. Rotating to the front, then detecting the screw end while rotating the bottle can by a predetermined angle, and measuring and inspecting the number of turns of the screw part based on the rotation angle up to the vicinity and the cumulative rotation angle of the predetermined angle. Is characterized by.

According to the measurement / inspection method of the present invention, the bottle can is rotated to the vicinity of the vicinity where the screw end appears on the contour line based on the specified number of screw turns, and then the bottle can is rotated by a predetermined angle. By detecting the end,
Since the number of turns of the screw portion is measured and inspected, the measurement and inspection of the number of turns of the screw portion can be performed well.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 to 9 are views showing a measurement / inspection apparatus to which a measurement / inspection method according to an embodiment of the present invention is applied. Before describing the measurement / inspection method of this embodiment, first, a bottle can to be measured will be described.
In the bottle can 30 shown in FIG. 9, a bottomed cylindrical can body 31 is formed by subjecting a plate body made of aluminum or its alloy to a DI process, and then a neck-in process is performed at the tip opening of the can body 31. To form a cap 32, and thereafter, a screw portion 33 for attaching a cap (not shown) is formed around the base 32, and a curl portion 34 is formed by folding an opening forming wall outward at the tip portion. To be done.

In this case, in the process of forming the bottle can 30, the undercoat coating, the character coating, etc. are applied and the baking processing is performed. In FIG. 9, reference numeral 35 indicates the screw start portion 35 of the screw portion 33 of the base. Although not shown in detail, the screw starting portion 35 is a screw portion 3 formed in a spiral shape from the upper side to the lower side with respect to the periphery of the base 32.
In Fig. 3, the thread and the thread root have prescribed dimensions to form the starting point portion of the effective screw that functions as the thread portion 33.

The measurement / inspection device of the embodiment shown in FIG. 1 is for measuring the bottle can 30 and is roughly classified into a supply unit 1 for the bottle can 30 and a supply unit 1.
The transport mechanism 3 is provided for feeding the bottle can 30 fed out from the container to the measurement position.

The supply section 1 is provided with a stocker 2 for storing a plurality of bottle cans 30, and the stocker 2 is installed so as to be inclined so that the outlet side is low and the opposite side is high, as shown in FIG. , A first storage portion 2A that stores therein, for example, three bottle cans 30 of the same type in a stacked manner,
On top of that, there is a second storage part 2B that stores three different kinds of bottle cans 30 of different lengths in a stacked manner, and the bottle cans 30 in these storage parts 2A, 2B move to the outlet side. It is like this.

As shown in FIG. 1, each storage section 2A, 2B is provided with a positioning plate 2c and a pressing plate 2d along the longitudinal direction, and the pressing plate 2d slides forward to position the tip opening of the bottle can 30. By pressing against the plate 2c, even the bottle cans 30 having different lengths are stored with the ends of the bottle cans 30 aligned. Further, as shown in FIG. 2, the supply unit 1 is provided with an L-shaped carry-out body 2a, and the carry-out body 2a receives the bottle can 30 to be measured at the outlet side of the storage units 2A and 2B. After that, by rotating like a chain line, it is extended to the delivery position via the ejection shooter 2b. The carry-out body 2a includes the storage units 2A, 2
It is configured such that it can be raised and lowered between B and can be rotated.

The transport mechanism 3 is provided with a suction unit 4, a robot hand 5, and a marker sensor 6, and when the bottle can 30 is fed out from the supply unit 1, the bottle can 30 is inserted into a cylinder or the like (not shown). ) To the suction unit 4, and the suction unit 4 sucks the bottle can 30 and then moves to the delivery position 7 in that state.

At this time, when the suction section 4 reaches the delivery position 7, the bottle can 30 is rotated around its axis,
Marker 3 where the marker sensor 6 is provided on the bottle can 30
By detecting 6, the position of the bottle can 30 in the delivery position 7 in the circumferential direction is positioned as the specific position.
The mark portion 36 is a colored body provided in advance at the position of the screw start portion 35 of the screw portion 33 in the base 32 of the bottle can 30. The suction unit 4 is provided with a rotation mechanism that rotates the bottle can 30 around the axis, and the marker sensor 6
When the mark portion 36 is detected by, the rotation of the bottle can 30 is stopped to position the mark portion 36 of the bottle can 30 at a specific position.
The circumferential position of the is specified.

When the robot hand 5 receives the bottle can 30 at the delivery position 7, the robot hand 5 changes its posture and places the bottle can 30 on the measuring table 8. Therefore, when the robot hand 5 places the bottle can 30 on the measuring table 8, the circumferential position of the bottle can 30 on the measuring table 8 is determined.

As shown in FIG. 3, the measuring table 8 is provided with a rotating part 9 for rotating the bottle can 30 around its axis and an elevating part 10 for raising and lowering the rotating part 9, and at the time of measurement, the bottle can 30 is required. It is possible to rotate and lift. The measuring table 8 is provided with a suction mechanism on the rotating portion 9, and when the bottle can 30 is fed by the robot hand 5, the bottle can 30 is sucked onto the rotating portion 9 by the operation of the suction mechanism, and the axis of the bottle can 30 is moved. And the measurement center axis of the rotating part 9 are made to coincide with each other.

Further, as shown in FIG. 3, the measurement / inspection apparatus of the measurement / inspection apparatus includes first to third cameras 11 to 13 as three imaging cameras and an illumination mechanism (not shown) for illuminating the bottle can 30 to be measured. No.) and an image processing unit 17 that measures the bottle can 30 by performing image processing based on the imaged data.

The first camera 11 of the image pickup camera is for obtaining main image pickup data having a large number of measurement points.
It is installed at the position directly facing the bottle can 30 as shown in FIG.
The second camera 12 and the first camera 11 have a predetermined angle (for example, 1
20 degrees) α1 is installed to face the bottle can 30, and the third camera 13 images the inner diameter of the curl portion 34 provided at the opening of the bottle can 30.
It is installed at a position above 0.

In this case, the first camera 11 uses the bottle can 3
In addition to the total length of 0, neck length, skirt height, curl width, it is for imaging many measurement points such as the screw portion 33, and the second camera 12 is for measuring the neck length of the bottle can 30. Is. Each of the first to third cameras 11 to 13 is composed of a solid-state image sensor such as a CCD.

The illumination mechanism includes the first to third illuminators 14 to 16.
It consists of The 1st and 2nd illuminators 14 and 15 are installed so that each of the 1st and 2nd cameras 11 and 12 can image the bottle can 30 as a silhouette image. That is, as shown in FIG. 1, the first illuminator 14 is installed at a position facing the first camera 11 across the bottle can 30 on the measuring table 8, and the second illuminator 15 is on the measuring table 8. Bottle can 30
It is installed at a position facing the second camera 12 with the camera in between. The third illuminator 16 has an annular shape provided around the front position of the first camera 11.

The image processing section 17 is provided in the control device 18. The control device 18 controls the entire measurement / inspection device as shown in FIG. 3, and when various data necessary for the measurement / inspection is input by the input unit 20, the control device 18 includes the stocker 2 described above based on the data. Supply unit 1 and suction unit 4
Also, various drive systems of the transfer device 3 including the robot hand 5 and the marker sensor 6 and various drive systems and control systems of the measuring table 8 are driven and controlled, respectively.

The image processing unit 17 includes the first to third cameras 11
13 to 13 are used to measure the measurement sites of the bottle can 30, respectively. That is, when the imaging data of the peripheral portion of the base of the bottle can 30 is input by the first camera 11, various inspections are performed on the screw portion 33 of the bottle can 30 based on the data, and the total length, neck length, neck length of the bottle can 30, The height of the skirt, the height of the thread 33, etc. are measured. Otherwise, the image processing unit 17 measures the neck length based on the image data of the periphery of the base of the bottle can 30 input by the second camera 12 at an image capturing distance different from that of the first camera 11, and further, Bottle can 3 by the third camera 13
When the imaging data of the tip opening portion of 0 is input, the inner diameter of the curl portion 34 provided in the base 32 of the bottle can 30 is measured from the imaging data.

Then, the measurement result by the image processing unit 17,
If the content of the measurement is within the allowable range, the bottle can 3 to be measured
When 0 is carried out to the next process and is out of the allowable range, the robot hand 5 carries out the bottle can 30 to be measured to the defective treatment process.

By the way, when the threaded portion 33 of the bottle can 30 is measured, the bottle can 30 has a cylindrical shape and an arbitrary position in the circumferential direction cannot be specified. Therefore, when the imaging camera takes an image of the bottle can 30, the mark part 36 provided on the bottle can 30 is positioned at a specific position, and the positioned mark part 36 is positioned.
The position of the bottle can 30 in the circumferential direction is specified by taking an image with the reference.

Therefore, in this measurement / inspection apparatus, at the measurement position, when the first camera 11 takes an image of the bottle can 30, the position of the mark portion 36 of the bottle can 30 is at either the left or right end on the imaging screen. Is set to be placed,
In this embodiment, as shown in FIG. 4, the mark portion 36 appears at the left end on the contour line of the bottle can 30 appearing on the imaging screen X.
That is, the screw start portion 35 is positioned.

That is, when the bottle can 30 is placed on the measuring table 8 by the robot hand 5, the screw start portion 35 of the screw portion 33 of the bottle can 30 faces the first camera 11 as shown in FIG. It is placed at a position deviated counterclockwise from the position by an angle α of 90 degrees. Therefore, when the first camera 11 takes an image of the bottle can 30, the screw start portion 35 of the bottle can 30 is positioned at the left end of the mouthpiece of the bottle can 30 on the contour line of the imaging screen X as shown in FIG. .

In this way, the circumferential position of the bottle can 30 is specified and set on the measuring table 8,
The image processing unit 17 uses the screw portion 33 of the bottle can 30,
It measures and inspects the screw distortion, the screw inclination angle, and the number of screw turns.

Next, a measuring method by the measuring / inspecting apparatus of this embodiment will be described. When measuring a bottle can 30, when one bottle can 30 of the type to be measured is fed out from the stocker 2 of the supply unit 1, the bottle can 30 is adsorbed by the adsorption unit 4 of the transport mechanism 3 and the adsorption unit 4 moves. Is moved to the delivery position 7. At this time, the suction unit 4
The screw part 3 of the base 32 of the bottle can 30
When the marker sensor 6 detects the mark portion 36 provided on the screw start portion 35 of No. 3, the mark portion 36 of the bottle can 30 is positioned at the transfer position 7 with the circumferential direction as a specific position.

In this way, the bottle can 30 has the mark portion 36.
When the bottle can 30 is placed on the measuring table 8 by the robot hand 5 after reaching the delivery position 7 with the circumferential direction as the specific position, the bottle can 30 is measured in that state. At this time, when the bottle can 30 is placed, the measuring table 8 is fixed by adsorbing the bottle can 30 while keeping the axis of the bottle can 30 aligned with the measurement center axis.

When the first to third cameras 11 to 13 as image pickup cameras pick up images of the bottle cans 30 on the measuring table 8 from the respective installation positions, the image pickup data are output to the image processing section 17. Become. At that time, bottle can 30
From the position directly facing the first camera 11 as shown in FIG.
Since the mark portion 36 is positioned at the position moved counterclockwise at the angle α1 of 0 degree and the position is the position of the screw start portion 35, when the first camera 11 images the bottle can 30, the bottle can 30 A screw start portion 35 as shown in FIG. 4 is projected on the left end of the image pickup data of 1., and the first camera 11 takes an image with the screw start portion 35 of the bottle can 30 as a reference.

Thereafter, in the image processing section 17, a screw strain measurement inspection is executed. At that time, the image processing unit 17 sets the top surface height of the bottle can and the measurement region K in advance based on the reference gauge during the measurement inspection. Then, the first camera 11 captures an image of the bottle can 30, and the captured image data is input to the image processing unit 17, and the image processing unit 17 sets the position of the top surface L1 of the bottle can 30 to be measured and performs measurement. The area K is determined.

Then, the measuring table 8 is rotated by a predetermined angle (for example, 3.6 degrees), and the image processing section 17 takes in image pickup data for each angle. That is, the image processing unit 17 measures the coordinate positions of the thread crests 37a and the thread troughs 37b, which are the screw start portions 35 in the measurement region K, based on the first image pickup data, and then the measuring table 8 moves the screw portions. When the thread 33 is rotated at a predetermined angle (3.6 degrees) along the winding direction, the coordinate positions of the thread ridge 37a and the thread valley 37b are similarly measured, and this is repeated sequentially. At this time, the measurement area K is set to the thread tip 37.
a and the screw trough 37b are displaced to be displaced downward. Then, this measurement is continued until the screw end of the screw portion 33, and the rotation of the bottle can 30 is stopped at the screw end. Here, the screw end of the bottle can 30 is detected as the screw end when the dimensional difference between the thread crest tip 37a and the thread trough 37b becomes a certain value or less.

In the above measurement, the bottle can 30 is imaged by the first camera 11, and the coordinate position of the screw thread tip 37a in the measurement area K for each predetermined angle is measured to obtain these data with a minimum of two. The thread reference line O as shown in FIG. 6 is obtained by calculation using the multiplication method. Then, from the thread reference line O, the maximum value P1 and the minimum value P2 of the thread protrusion end 37a and the angle θ of the reference line O are obtained. This allows
The maximum value P1 of the thread crest tip 37a is detected as the magnitude of the screw strain, and the thread portion 33 is detected by the angle θ of the reference line O.
The inclination angle (lead angle) Q of is obtained.

On the other hand, to measure the number of turns of the screw portion 33,
The measurement region K is set in a portion corresponding to the screw portion 33 appearing on the contour line of the bottle can 30, and the bottle can 30 is moved to the vicinity before the screw end of the screw portion 33 appears on the contour line based on the specified number of screw turns. Rotate, then bottle can 30
Is rotated by a predetermined angle to detect the end of the screw, and the number of turns of the screw portion is measured based on the rotation angle up to the vicinity and the cumulative rotation angle by the predetermined angle.

A specific example of measuring the number of turns will be described below. In this example, the prescribed number of turns of the screw portion 33 of the bottle can 30 is 1.7. As shown in FIG. 8, when the position of the screw starting portion 35 (mark portion 36) of the bottle can 30 is located at the left end of the contour line at an angle of 90 degrees with respect to the camera 11, The position of the prescribed screw end E of the bottle can 30 is α2 = 72 ° from the right end of the opposite contour line (180 ° position). That is, α2 is calculated by doubling the number of turns and dividing it into an integer part and a decimal part and multiplying the decimal part by 180 °. 1.7 × 2 = 3.4 = 3 + 0.4 (1) 180 ° × 0.4 = 72 ° (2) With the specified number of turns, the screw end E appears on the contour line after turning 72 °. Actually, there is a case where there is an error in the position of the screw end E, so if the screw end E is turned to, for example, 90% before, and the screw end E is measured at a constant angle, the screw end E can be measured at any measurement position. .

That is, when the bottle can 30 is swung in the counterclockwise direction at an angle α2 of 72 ° at a stretch, the thread end E passes through because of an error or the like, and the effective portion of the thread 33 and the thread end are passed. Since the boundary with the part E cannot be determined, the position of the screw end E is detected by rotating at a fixed angle and measuring in small steps from that position. Where 90%
If it is rotated, it is 72 ° × 0.9 = 64.8 ° (3) α3 = 64.8 °, and it is rotated to this position and rotated from this position by 3.6 ° in the same manner as described above. Let
Each time, the number of times of rotation is counted while determining whether the screw end E appears, and the rotation is stopped when the screw end E appears. Here, the rotation angle for each number of times is integrated, and when the number of times is three, for example, 3.6 ° × 3 = 10.8 ° (4), and thus the number of turns is (180 ° × 3 + 64.8 ° + 10.8 °) / 360 °
= 1.71 times, and it can be determined that the number of turns is 0.01 more than the prescribed number of turns of 1.7.

In this way, the bottle can 30 is rotated to a position just before the end of the thread of the screw portion 33 appears on the contour line based on the specified number of screw turns, and then the bottle can 30 is rotated by a predetermined angle and screwed. By detecting the end and measuring the number of turns of the screw part based on the rotation angle to the near side and the cumulative rotation angle of each of the predetermined angles, it is not necessary to measure the number of turns from the screw start, and the number of turns can be measured quickly and quickly. Can be done accurately. In addition, it is needless to say that the measurement can be performed by rotating the bottle can 30 in a clockwise direction in the same manner. However, depending on the number of windings of the screw portion 33, is it closer to one of the left and right sides of the contour line of the bottle can? It is preferable to select according to.

Thus, according to this measurement / inspection device, the supply unit 1, the transport mechanism 3, the first to third cameras 11 to 13 as image pickup cameras, the image processing unit 17, and the control unit 19 are configured. Therefore, various measurement inspections on the screw portion 33 of the bottle can 30 can be reliably performed.

[0047]

As described above, according to the first aspect of the present invention, the thread ridge and the thread ridge obtained by obtaining the coordinates of the thread ridge and the thread valley that are displaced with the rotation of the bottle can are obtained. Since the screw part is measured and inspected based on the coordinate data of the valley, the screw part of the bottle can can be reliably measured and inspected, and the effect that the screw part can be measured and inspected satisfactorily is obtained. The effect that higher quality or more uniform can be obtained.

According to the second aspect of the present invention, the screw strain is measured and inspected based on the coordinate data of the thread crest tip and the screw trough, so that there is an effect that the screw strain can be satisfactorily inspected.

According to the third aspect of the present invention, since the inclination angle of the screw portion of the bottle can is also measured and inspected, the effect that the inclination angle of the screw portion can be measured and inspected satisfactorily is obtained.

According to the fourth aspect of the present invention, the number of screw turns is measured and inspected based on the coordinate data of the thread crest tip and the screw root, so that the measurement and inspection of the number of screw turns can be favorably performed.

According to the fifth aspect of the present invention, the bottle can is rotated to a position near the vicinity where the screw end appears on the contour line based on the specified number of screw turns, and then the bottle can is rotated by a predetermined angle and the screw end is rotated. Since it is configured to measure and inspect the number of turns of the screw portion by detecting, the effect that the number of turns of the screw portion can be satisfactorily measured and inspected is also obtained.

[Brief description of drawings]

FIG. 1 is a diagram showing a measurement / inspection device according to an embodiment of the present invention, and is a plan view showing a transport path of a bottle can.

FIG. 2 is an explanatory front view showing a supply unit.

3 is a configuration block diagram showing a main part of the measurement / inspection device of FIG.

FIG. 4 is an explanatory diagram showing a bottle can imaged by an imaging camera.

FIG. 5 is an explanatory diagram for reading the coordinates of the thread crest tip of the screw start in the screw portion when inspecting the screw distortion of the screw portion of the bottle can.

FIG. 6 is an explanatory diagram for obtaining the screw strain and the inclination angle of the screw based on the coordinate data of the thread crest tip of the screw portion.

FIG. 7 is an explanatory diagram for obtaining a difference between a thread crest tip and a thread root in a thread portion of a bottle can.

FIG. 8 is an explanatory diagram for measuring and inspecting the number of turns based on the number of turns of the screw portion.

FIG. 9 is an explanatory view showing the vicinity of the base of a bottle can.

[Explanation of symbols]

1 supply section 2 Stocker 2A, 2B 1st, 2nd storage part 3 Transport mechanism 4 Adsorption part 5 robot hand 6 Marker sensor 7 Delivery position 8 measuring table 9 rotating part 10 Lifting part 11 First camera (imaging camera) 12 Second camera (imaging camera) 13 Third camera (imaging camera) 14 First illuminator (illumination mechanism) 15 Second illuminator (illumination mechanism) 16 Third illuminator (illumination mechanism) 17 Image processing section 18 Control device 20 Input section 30 bottle cans 32 mouthpiece 33 Thread 34 Curl part 35 screw start 36 mark part 37a Thread tip (top of thread) 37b Nejitani E screw end X imaging screen K measurement area Δ Difference between screw thread (tip) and screw root

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masami Tabashi             Mitsubishi Ma, 1500 Suganuma, Oyama-cho, Sunto-gun, Shizuoka Prefecture             Terial Co., Ltd. Fuji Oyama Factory (72) Inventor Nobuo Suzuki             Mitsubishi Ma, 1500 Suganuma, Oyama-cho, Sunto-gun, Shizuoka Prefecture             Terial Co., Ltd. Fuji Oyama Factory (72) Inventor Katsushi Takatsu             Kurashiki Spinning 14-5 Shimokita Town, Neyagawa City, Osaka Prefecture             Koji Co., Ltd. Electronic Application System Department F term (reference) 2F065 AA02 AA03 AA22 AA26 AA27                       AA31 AA51 AA65 BB05 BB27                       DD06 FF04 JJ05 JJ26 MM04                       PP13 QQ18 QQ31 TT02 TT03                 2G051 AA14 AA21 AB08 AB10 AB20                       BA01 CA04 CA07 DA01 DA06                       DA08 EA12 EA14 ED21 ED30                 5B057 AA02 CA12 CA16 DA03 DB02                       DC01 DC36

Claims (5)

[Claims] 1. A metal bottle can having a mouthpiece having a threaded portion formed on its outer peripheral surface is set on a measuring table, and while rotating the bottle can about its axis, from the side of the bottle can. A method for measuring and inspecting a bottle can, wherein an image of an outline of the bottle can is picked up by an image pickup means, and the screw portion is measured and inspected based on the picked-up image data. Setting a measurement region in a portion corresponding to the screw starting portion in a state where the screw starting portion of the screw portion appears on the contour line; C. While obtaining the coordinates of the thread crest tip and the thread trough that are displaced with the rotation of the bottle can, the measurement region is displaced following the thread crest tip and the thread trough at regular intervals, and C. A method for measuring and inspecting a bottle can, which comprises measuring and inspecting a screw portion based on coordinate data of the thread crest tip and the thread trough. 2. The method for measuring and inspecting a bottle can according to claim 1, wherein the screw strain is measured and inspected based on the coordinate data of the thread crest tip and the thread trough. 3. The method for measuring and inspecting a bottle can according to claim 1, wherein the inclination angle of the screw is measured and inspected based on the coordinate data of the thread crest tip and the thread trough. 4. The method for measuring and inspecting a bottle can according to claim 1, wherein the number of screw turns is measured and inspected based on the coordinate data of the thread crest tip and the thread trough. 5. The bottle can measuring and inspecting method according to claim 1, wherein the A. Instead of setting, the measurement area is set in a portion corresponding to the screw portion that appears on the contour line, and the bottle can is near the screw end of the screw portion that appears on the contour line based on a specified number of screw turns. Rotate to the front, then
A bottle can characterized by detecting the end of the screw while rotating the bottle can by a predetermined angle, and measuring and inspecting the number of turns of the screw portion based on the rotation angle up to the vicinity and the cumulative rotation angle of the predetermined angle. Measurement inspection method.