JP3920115B2 - Measuring method of bottle can - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a measurement and inspection method, and more particularly to a technique for measuring a bottle can made of aluminum or an alloy thereof.
[0002]
[Prior art]
A metal bottle can (hereinafter simply referred to as a bottle can) is generally formed by drawing a metal plate made of aluminum or an aluminum alloy and then performing an ironing process (Ironing). It is called a can.
[0003]
Such a bottle can is currently widely used as a beverage can, and after being formed into a bottomed cylindrical can body from a metal plate, the upper part is reduced in diameter (neck-in processing). A base smaller than the diameter of the can body is formed, and then a screw portion for attaching a cap to the base is formed.
[0004]
[Problems to be solved by the invention]
By the way, in recent years, as the demand for bottle cans increases, it is required to measure bottle cans in order to achieve higher quality and uniformity.
However, since the bottle can made of aluminum or the like has a cylindrical shape, the peripheral position is not clearly distinguished, is flexible and thin, and is DI-processed. Since the screw part is provided in the die after forming the die by processing, it is forced to cause a deviation between the axis of the can body and the axis of the die, and thus the formed screw part varies, that is, There has been a problem in that the thread and thread valley of the thread portion vary.
To solve this problem, it is conceivable to inspect the screw part of the bottle can and correct the processing of the screw part based on the inspection result. However, a manual method using a general two-dimensional shape measuring machine In fact, there is no effective and appropriate method for inspection.
[0005]
The present invention has been made in consideration of such circumstances, and its purpose is to provide a measurement and inspection method capable of reliably measuring and inspecting the screw portion of the bottle can and improving the quality of the bottle can. It is to provide.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention proposes the following means.
According to the first aspect of the present invention, a metal bottle can having a base having a threaded portion formed on the outer peripheral surface is set on a measurement table, and the bottle can is rotated about its axis while the bottle can is rotated. A method for measuring and inspecting a bottle can by imaging an outline of the bottle can from the side and measuring and inspecting the screw portion based on the image data. B. setting a measurement region in a portion corresponding to the screw start portion in a state where the screw start portion of the screw portion appears on the contour line; C. obtaining the coordinates of the thread tip and the thread valley displaced with the rotation of the bottle can, and displacing the measurement region at regular intervals to follow the thread tip and the thread valley; The threaded portion is measured and inspected based on the coordinate data of the thread protrusion end and the thread valley.
[0007]
According to the measurement and inspection method according to the present invention, while obtaining the coordinates of the thread tip and the thread valley that are displaced along with the rotation of the bottle can, the measurement region is tracked to the thread tip and the thread valley at regular intervals. When it is displaced, the coordinate data of the thread tip and thread valley is obtained by the measurement area, and the thread part is measured and inspected based on the coordinate data, so the thread part of the bottle can can be reliably measured and inspected, The threaded portion can be satisfactorily measured and inspected.
[0008]
According to a second aspect of the present invention, in the measurement / inspection method according to the first aspect, the screw strain is measured and inspected based on the coordinate data of the thread tip and the thread valley.
[0009]
According to the measurement / inspection method of the present invention, the screw strain is measured and inspected based on the coordinate data of the thread tip and the thread valley, so that the screw strain can be inspected satisfactorily.
[0010]
According to a third aspect of the present invention, in the measurement / 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 ridge end and the thread valley.
[0011]
According to the measurement / inspection method according to the present invention, the inclination angle of the threaded portion of the bottle can can be reliably measured, so that the measurement / inspection of the inclination angle of the threaded portion can be favorably performed.
[0012]
The invention according to claim 4 is the measurement and inspection method according to claim 1, wherein, in the rotational angle of the bottle can from the thread tip and the thread-starting portion which is more detected coordinate data of the thread root to thread the end portion Based on the above, the number of screw turns is measured and inspected.
[0013]
According to measurement and inspection method according to the present invention, since measuring the screw turns in accordance with the rotational angle of said bottle can from the thread-starting part more is detected in the coordinate data of the thread tip and thread root to thread the end portion Thus, it is possible to satisfactorily perform a measurement inspection of the number of screw turns.
[0014]
According to a fifth aspect of the present invention, in the bottle can measurement and inspection method according to the fourth aspect , the screw end of the screw portion appears on the contour line based on a prescribed number of screw turns from the screw start portion. rotated to near the front, then while rotating the bottle cans by a predetermined angle to detect the end screw, measurement and inspection of the number of turns of the screw portion, based on the cumulative revolution angle of each rotation angle and the predetermined angle to the vicinity of the front It is characterized by doing.
[0015]
According to the measurement and inspection method according to the present invention, the bottle can is rotated from the screw start portion to a position near the end where the screw end appears on the contour line based on the prescribed number of screw turns, and then the bottle can is rotated by a predetermined angle. However, since the number of turns of the screw portion is measured and inspected by detecting the end of the screw, the measurement and inspection of the number of turns of the screw portion can be performed satisfactorily.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. 1 to 9 are diagrams 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 and inspection method of this embodiment, first, a bottle can to be measured will be described. A bottle can 30 shown in FIG. 9 is formed by subjecting a plate made of aluminum or an alloy thereof to DI processing to form a bottomed cylindrical can body 31, and then neck-in the tip opening of the can body 31. After that, a base 32 is formed, and then a screw portion 33 for attaching a cap (not shown) around the base 32 is formed, and a wall for forming an opening is folded outward at the tip portion to form a curled portion 34. Is done.
[0017]
In this case, in the formation process of the bottle can 30, undercoating, character coating, and the like are performed and a baking process is performed. In FIG. 9, the code | symbol 35 has shown the screw | thread start part 35 in the screw part 33 of a nozzle | cap | die. Although this screw start portion 35 is not shown in detail, in the screw portion 33 formed spirally downward from the upper part with respect to the periphery of the base 32, the screw thread and the screw valley have predetermined dimensions. The starting point portion of the effective screw functioning as the screw portion 33 is formed.
[0018]
And the measurement inspection apparatus of embodiment shown in FIG. 1 is for measuring the said bottle can 30, Comprising: When it divides roughly, the bottle can 30 drawn | fed out from the supply part 1 of the bottle can 30 and the supply part 1 A transport mechanism 3 for feeding 30 to the measurement position is provided.
[0019]
The supply unit 1 is provided with a stocker 2 for storing a plurality of bottle cans 30, and as shown in FIG. 2, the stocker 2 is installed so as to be inclined so that the outlet side is low and the opposite side is high. For example, the 1st storage part 2A which accumulates and stores the same kind of bottle cans 30 in three stages, and the second storage part 2B which stores the different types of bottle cans 30 in different lengths on the first storage part 2B. The bottle cans 30 in the storage units 2A and 2B are moved to the outlet side.
[0020]
As shown in FIG. 1, a positioning plate 2c and a pressing plate 2d along the longitudinal direction are provided in each of the storage portions 2A and 2B, and the pressing plate 2d slides forward so that the front end opening of the bottle can 30 is moved to the positioning plate 2c. By pressing, the bottle cans 30 having different lengths are stored with the tips of the bottle cans 30 aligned.
Further, the supply unit 1 is provided with an unloading body 2a formed in an L shape as shown in FIG. 2, and the unloading body 2a receives a bottle can 30 to be measured on the outlet side of the storage units 2A and 2B. After that, by rotating like a chain line, it is fed to the feeding position via the discharge shooter 2b. The carry-out body 2a is configured to be movable up and down and rotatable between the storage portions 2A and 2B.
[0021]
The transport mechanism 3 includes an adsorption unit 4, a robot hand 5, and a marker sensor 6. When the bottle can 30 is unwound from the supply unit 1, the bottle can 30 is passed through an intermediate body (not shown) such as a cylinder. Then, after the suction part 4 sucks the bottle can 30, it moves to the delivery position 7 in that state.
[0022]
At that time, when the suction part 4 reaches the delivery position 7, the bottle can 30 is rotated around its axis, and the marker sensor 6 detects the mark part 36 provided on the bottle can 30, thereby delivering the delivery position 7. The position in the circumferential direction of the bottle can 30 is positioned as the specific position. The mark portion 36 is made of 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 part 4 is provided with a rotation mechanism for rotating the bottle can 30 around the axis, and when the marker sensor 6 detects the mark part 36, the rotation of the bottle can 30 is stopped, thereby the mark part of the bottle can 30. The position of 36 is positioned at a specific position, whereby the circumferential position of the bottle can 30 is specified.
[0023]
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 measurement table 8, the circumferential position of the bottle can 30 on the measurement table 8 is determined.
[0024]
As shown in FIG. 3, the measuring table 8 includes a rotating unit 9 that rotates the bottle can 30 around its axis, and an elevating unit 10 that raises and lowers the rotating unit 9, and rotates the bottle can 30 as necessary during measurement. Can be moved up and down. In the measuring table 8, an adsorption mechanism is provided in the rotating unit 9, and when the bottle can 30 is fed by the robot hand 5, the bottle can 30 is adsorbed to the rotating unit 9 by the operation of the adsorption mechanism, and the axis of the bottle can 30. And the measurement center axis of the rotating unit 9 are made to coincide with each other.
[0025]
In addition, as shown in FIG. 3, the measurement and inspection apparatus includes first to third cameras 11 to 13 that are three imaging cameras, and an illumination mechanism (not shown) that illuminates the bottle can 30 to be measured. The image processing unit 17 that measures the bottle can 30 by performing image processing based on the imaging data.
[0026]
The first camera 11 of the imaging camera is for obtaining main imaging data having a large number of measurement points, and is installed at a position facing the bottle can 30 as shown in FIG. The camera 11 is installed in a position facing the bottle can 30 at a predetermined angle (for example, 120 degrees) α1, and the third camera 13 images the inner diameter of the curled portion 34 provided in the opening of the bottle can 30. The bottle can 30 is installed above the can.
[0027]
In this case, the first camera 11 is for imaging a large number of measurement points such as the total length, neck length, skirt height, curl width, and threaded portion 33 of the bottle can 30, and the second camera 12 is used for the bottle 12. This is for measuring the neck length of the can 30. Each of the first to third cameras 11 to 13 is configured by a solid-state imaging device such as a CCD.
[0028]
The illumination mechanism includes first to third illuminators 14 to 16. The first and second illuminators 14 and 15 are installed so that each of the first and second cameras 11 and 12 can capture 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 measurement table 8, and the second illuminator 15 is on the measurement table 8. It is installed at a position facing the second camera 12 across the bottle can 30. The third illuminator 16 has an annular shape provided around the front position of the first camera 11.
[0029]
The image processing unit 17 is provided in the control device 18. As shown in FIG. 3, the control device 18 controls the entire measurement / inspection device. When various data necessary for measurement / inspection are input by the input unit 20, the control device 18 includes the stocker 2 described above. Various supply systems of the conveying device 3 provided with the supply unit 1, the suction unit 4 and the robot hand 5 and the marker sensor 6, and various drive systems and control systems of the measurement table 8 are respectively driven and controlled.
[0030]
The image processing unit 17 measures the measurement site of the bottle can 30 based on the imaging data captured by the first to third cameras 11 to 13.
That is, when the imaging data of the peripheral part of the cap in the bottle can 30 is input by the first camera 11, the threaded portion 33 of the bottle can 30 is variously inspected based on the data, and the total length, neck length, neck length, The skirt height, the height of the thread 33, and the like are measured. Otherwise, the image processing unit 17 measures the neck length based on the imaging data of the peripheral part of the mouthpiece of the bottle can 30 when the second camera 12 is input at an imaging distance different from that of the first camera 11. When imaging data of the front end opening of the bottle can 30 is input by the third camera 13, the inner diameter dimension of the curled portion 34 provided on the base 32 of the bottle can 30 is measured from the imaging data. .
[0031]
If the measurement result by the image processing unit 17 indicates that the measurement content is within the allowable range, the bottle can 30 to be measured is carried out to the next step. 30 is carried out to the defect processing step.
[0032]
By the way, when measuring the threaded portion 33 of the bottle can 30, the bottle can 30 has a cylindrical shape, and an arbitrary position in the circumferential direction cannot be specified. Therefore, when the imaging camera captures an image of the bottle can 30, the mark portion 36 provided on the bottle can 30 is positioned at a specific position, and the bottle can is imaged based on the positioned mark portion 36. 30 positions in the circumferential direction are specified.
[0033]
Therefore, in this measurement and inspection apparatus, when the first camera 11 images the bottle can 30 at the measurement position, the position of the mark portion 36 of the bottle can 30 is arranged at either the left or right end on the imaging screen. In this embodiment, as shown in FIG. 4, the mark portion 36, that is, the screw start portion 35 is positioned at the left end on the outline of the bottle can 30 appearing on the imaging screen X. Yes.
[0034]
That is, when the bottle can 30 is placed on the measuring table 8 by the robot hand 5, the screw start portion 35 in the screw portion 33 of the bottle can 30 is 90 from the position facing the first camera 11 as shown in FIG. It is placed so as to be shifted counterclockwise at an angle α of degrees. Therefore, when the bottle can 30 is imaged by the first camera 11, the screw start portion 35 of the bottle can 30 is positioned on the left end of the base of the bottle can 30 on the outline of the imaging screen X as shown in FIG. 4. .
[0035]
In this way, the position of the bottle can 30 in the circumferential direction is specified and set with respect to the measurement table 8, so that the image processing unit 17 performs screw distortion, a screw inclination angle, and the number of screw turns for the screw portion 33 of the bottle can 30. I am trying to measure and inspect.
[0036]
Next, a measurement method using the measurement inspection apparatus of this embodiment will be described.
When measuring the bottle can 30, when one kind of bottle can 30 to be measured is fed 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. To move to the delivery position 7. At this time, the suction portion 4 rotates and the marker sensor 6 detects the mark portion 36 provided on the screw start portion 35 of the screw portion 33 of the base 32 of the bottle can 30, so that the bottle can at the delivery position 7. Thirty mark portions 36 are positioned with the circumferential direction as a specific position.
[0037]
As described above, when the bottle can 30 is placed on the measuring table 8 by the robot hand 5 after the bottle can 30 has reached the delivery position 7 with the circumferential direction as the specific position by the mark portion 36, the bottle can be in that state. The can 30 will be measured. At this time, when the bottle can 30 is placed, the measuring table 8 is fixed by adsorbing the bottle can 30 while the axis of the bottle can 30 coincides with the measurement central axis.
[0038]
And if the 1st-3rd cameras 11-13 as an imaging camera image the bottle can 30 on the measurement stand 8 from each installation position, the imaging data will be output to the image process part 17. FIG. At that time, the mark portion 36 is positioned at a position where the bottle can 30 is moved counterclockwise at an angle α1 of 90 degrees from the position facing the first camera 11 as shown in FIG. 4, when the first camera 11 images the bottle can 30, a screw start portion 35 as shown in FIG. 4 is displayed at the left end of the image data of the bottle can 30, and the first camera 11 Imaging is performed with the screw start portion 35 as a reference.
[0039]
Thereafter, the image processing unit 17 executes a screw strain measurement inspection. At that time, the image processing unit 17 sets the height of the top surface of the bottle can and the measurement region K based on the reference gauge in advance for the measurement inspection. And the 1st camera 11 images the bottle can 30, The imaging data are input into the image process part 17, and while setting the position of the top | upper surface L1 of the bottle can 30 to be measured, the image process part 17 is measured. Region K is determined.
[0040]
Then, the measurement table 8 rotates by a predetermined angle (for example, 3.6 degrees), and the image processing unit 17 captures imaging data for each angle. That is, the image processing unit 17 measures the coordinate positions of the screw thread tip 37a and the screw valley 37b, which are the screw start portions 35 in the measurement region K, based on the first imaging data. Similarly, when rotating by a predetermined angle (3.6 degrees) along the winding direction of 33, the coordinate positions of the thread tip 37a and the thread valley 37b are measured, and this is sequentially repeated. At this time, the measurement region K is displaced downward by following the displacement of the thread tip 37a and the thread valley 37b. 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 screw thread tip 37a and the screw valley 37b becomes a certain value or less.
[0041]
In the above measurement, the bottle can 30 is imaged by the first camera 11 and the coordinate position of the thread protrusion 37a in the measurement region K for each predetermined angle is measured to calculate these data by the least square method. As a result, a thread reference line O as shown in FIG. 6 is obtained. Then, the maximum value P1, the minimum value P2, and the angle θ of the reference line O of the thread protrusion end 37a are obtained from the thread reference line O. As a result, the maximum value P1 of the screw thread protrusion 37a is detected as the magnitude of the screw strain, and the inclination angle (lead angle) Q of the screw portion 33 is obtained from the angle θ of the reference line O.
[0042]
On the other hand, in order to measure the number of turns of the threaded portion 33, a measurement region K is set in a portion corresponding to the threaded portion 33 appearing on the contour line of the bottle can 30, and the bottle can 30 is moved to the threaded portion based on the prescribed number of screw turns. The screw end of 33 is rotated to the near side where the outline appears, and then the screw end is detected while rotating the bottle can 30 by a predetermined angle, and the rotation angle to the near side and the rotation accumulated angle by the predetermined angle are detected. The number of turns of the thread portion is measured based on the above.
[0043]
Hereinafter, specific examples of the winding number measurement will be described. In this example, it is assumed that the specified number of turns of the threaded portion 33 of the bottle can 30 is 1.7 times. As shown in FIG. 8, when the position of the screw start portion 35 (mark portion 36) of the bottle can 30 is positioned at the left end of the contour line at an angle of 90 degrees with respect to the camera 11 (this position is The position of the specified screw end E of the bottle can 30 is at a position of α2 = 72 ° from the right end of the opposite contour line (180 degree position).
That is, the number of turns is doubled to be divided into an integer part and a decimal part, and α2 is calculated by multiplying the decimal part by 180 °.
1.7 × 2 = 3.4 = 3 + 0.4 (1)
180 ° × 0.4 = 72 ° (2)
If the specified number of turns is turned 72 °, the screw end E appears on the contour line. However, since there may be an error in the position of the screw end E, turn it to the front, for example 90% before, and from there If the measurement is performed at a constant angle, the screw end E can be measured at any measurement position.
[0044]
That is, when the bottle can 30 is reversely rotated counterclockwise at an angle α2 of 72 °, the portion of the screw end E passes due to an error or the like, and the effective portion of the screw portion 33 and the screw end portion E Therefore, the position of the screw end E is detected by measuring from the position in small increments.
If we rotate 90% here,
72 ° × 0.9 = 64.8 ° (3)
α3 = 64.8 °, rotated to this position, rotated from this position by 3.6 ° in the same manner as described above, and each time the number of rotations is determined while determining whether the screw end E has appeared. The rotation is stopped when the screw end E appears.
Here, the rotation angle for each number of times is integrated, for example, when the number of times is 3,
3.6 ° × 3 = 10.8 ° (4)
Therefore, 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 times greater than the prescribed number of turns 1.7.
[0045]
In this way, the bottle can 30 is rotated to a position just before the end of the screw portion 33 appears on the contour line based on the prescribed number of screw turns, and then the end of the screw is detected while rotating the bottle can 30 by a predetermined angle. Then, by measuring the number of turns of the screw portion based on the rotation angle up to the near side and the rotation accumulated angle by the predetermined angle, it is not necessary to measure the number of turns from the beginning of the screw, and the number of turns is measured quickly and accurately. be able to.
In addition, it can of course be measured by rotating the bottle can 30 in the same manner in the same manner. It is preferable to select according to.
[0046]
Thus, according to this measurement and inspection apparatus, since it is configured to include the supply unit 1, the transport mechanism 3, the first to third cameras 11 to 13 as imaging cameras, the image processing unit 17, and the control device 19, the bottle Various measurement inspections on the threaded portion 33 of the can 30 can be reliably performed.
[0047]
【The invention's effect】
As described above, according to the first aspect of the present invention, the coordinate data of the thread tip and the thread valley obtained by obtaining the coordinates of the thread tip and the thread valley displaced with the rotation of the bottle can are obtained. Based on the fact that the thread part is measured and inspected, the threaded part of the bottle can can be reliably measured and inspected, and the effect that the threaded part can be measured and inspected well can be obtained. The effect which can be made uniform is acquired.
[0048]
According to the second aspect of the present invention, since the screw strain is measured and inspected based on the coordinate data of the screw thread tip and the thread valley, an effect that the screw strain can be inspected satisfactorily is obtained.
[0049]
According to the invention which concerns on Claim 3, since the inclination angle of the thread part of a bottle can is also measured and inspected, the effect which can perform the measurement inspection of the inclination angle of a thread part favorably is acquired.
[0050]
According to the invention according to claim 4, since the screw turns to measurement and inspection in accordance with the rotational angle of said bottle can from the thread-starting part more is detected in the coordinate data of the thread tip and thread root to thread the end portion The effect that the measurement inspection of the number of screw windings can be performed well is obtained.
[0051]
According to the invention which concerns on Claim 5, after rotating a bottle can from the said screw | thread start part to the near front which a screw end appears on a contour line based on the prescribed number of screw turns, Since it is configured to measure and inspect the number of turns of the threaded part by detecting the end of the screw, this also has the effect of being able to perform a good measurement and inspection of the number of turns of the threaded part, and also has the effect of being able to perform quickly. It is done.
[Brief description of the drawings]
FIG. 1 is a diagram showing a measurement / inspection apparatus according to an embodiment of the present invention, and is a plan view showing a conveyance 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 apparatus of FIG. 1. FIG.
FIG. 4 is an explanatory diagram showing a bottle can imaged by an imaging camera.
FIG. 5 is an explanatory diagram for reading out the coordinates of a screw thread protrusion at the beginning of a screw in the screw portion at the time of screw strain inspection of the screw portion of the bottle can.
FIG. 6 is an explanatory diagram for obtaining screw strain and a tilt angle of a screw based on coordinate data of a screw thread tip of a screw portion.
FIG. 7 is an explanatory diagram for obtaining a difference between a thread ridge end and a thread valley in a thread portion of a bottle can.
FIG. 8 is an explanatory diagram for performing a measurement inspection of the number of turns based on the number of turns of a threaded portion.
FIG. 9 is an explanatory view showing the periphery of a base of a bottle can.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Supply part 2 Stocker 2A, 2B 1st, 2nd storage part 3 Conveyance mechanism 4 Adsorption part 5 Robot hand 6 Marker sensor 7 Delivery position 8 Measurement stand 9 Rotation part 10 Lifting part 11 1st 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)
Reference Signs List 17 Image processing unit 18 Control device 20 Input unit 30 Bottle can 32 Base 33 Screw part 34 Curl part 35 Screw start part 36 Mark part 37a Thread tip (top of thread)
37b Screw Valley E End of Screw X Imaging Screen K Measurement Area Δ Difference between Thread (Tip) and Thread Valley

Claims (5)

A metal bottle can having a base having a threaded portion formed on the outer peripheral surface is set on a measurement table, and the bottle can is rotated around its axis while the bottle can be imaged from the side of the bottle can by an imaging means. A bottle can measurement and inspection method for imaging a contour of a can and measuring and inspecting the screw portion based on the imaging data,
A. In the state where the screw start portion of the screw portion appears on the contour line, a measurement area is set in a portion corresponding to the screw start portion,
B. While determining the coordinates of the thread tip and thread valley that are displaced with the rotation of the bottle can, the measurement region is displaced following the thread tip and thread valley at regular intervals,
C. A method for measuring and inspecting a bottle can, wherein the thread portion is measured and inspected based on the coordinate data of the screw thread tip and the thread valley. The measurement and inspection method according to claim 1,
A method for measuring and inspecting a bottle can, wherein the screw distortion is measured and inspected based on the coordinate data of the screw thread tip and the thread valley. The measurement and inspection method according to claim 1,
A bottle can measuring and inspecting method, comprising: measuring and inspecting an inclination angle of a screw based on the coordinate data of the screw thread tip and screw valley. The measurement and inspection method according to claim 1,
Measurement and inspection of bottle cans, characterized in that the screw turns to measurement and inspection in accordance with the rotational angle of said bottle can from the thread tip and the thread-starting portion which is more detected coordinate data of the thread root to thread the end portion Method. In the measurement inspection method according to claim 4 ,
The bottle can is rotated from the screw start portion to a position near the end where the screw end of the screw portion appears in the contour line based on a predetermined number of screw turns, and then the screw end is rotated while rotating the bottle can by a predetermined angle. A method for measuring and inspecting a bottle can, comprising: detecting and measuring and inspecting the number of turns of a screw portion based on a rotation angle up to the near side and a rotation accumulation angle by the predetermined angle.

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