JP5210949B2 - Can body inspection apparatus and can body inspection method - Google Patents

Description

  The present invention relates to a can body inspection device and a can body inspection method for inspecting an inner surface of a can body from the opening side of a bottomed can body.

2. Description of the Related Art Conventionally, as a container filled with a beverage or the like, for example, a can body made of a bottomed cylinder made of an aluminum alloy or the like has been adopted.
This can body is generally called a DI can because it is formed by drawing a metal plate made of aluminum or an alloy thereof by drawing processing and then ironing processing performed thereafter. .

  This DI can is formed by punching a flat metal plate and molding it into a cup shape, and then performing DI molding on the basis of the cup-shaped bottom portion so that the body portion is integrally stretched from the bottom portion. The Accordingly, the DI can has a bottomed cylindrical shape having a bottom portion at one end of a cylindrical barrel portion and an opening at the other end.

  In particular, in the case of manufacturing a two-piece can, after manufacturing the bottomed cylindrical DI can as described above, a neck portion is formed by neck processing for gradually reducing the diameter of the opening portion. At the opening end, a flange portion extending outward in the radial direction is formed by flange processing. In addition, since neck processing and flange processing are performed on the basis of the axis line of the trunk | drum of a can body, the axis line of a neck part and a flange part corresponds with the axis line of the trunk | drum part of a can body.

  In the manufacturing process of such a can body, an inspection is performed for the presence or absence of defects such as scratches and dirt on the can body. As an example of this, for example, in Patent Document 1, light is emitted from the outside of the can body while the bottom of the can body is adsorbed by the bottom chuck, and light leaking into the inside of the can body is detected to detect a pinhole or What inspects defects, such as a crack, is indicated.

  Further, in Patent Document 2, an inner surface of a can body is imaged from above by a camera or the like with respect to a can body that moves in a line shape with an opening facing upward, and image processing is performed from the captured image. An inspection method for determining a defect on an inner surface of a can body using a means is disclosed. In this inspection method, imaging is performed with the optical axis of the imaging means aligned with the axis of the can body.

JP-A-9-210924 JP 2008-241649 A

By the way, when imaging and inspecting the inner surface or flange portion of the body of the can body using the can body inspection method described in Patent Document 2, the optical axis of the imaging means can be used for the can body moving on the line. It is difficult to accurately match the axis of the body, and imaging is performed in a state where the optical axis of the imaging means is deviated from the axis of the can body.
Therefore, the image of the imaged inner surface is biased, for example, the image of the portion close to the optical axis becomes dense, the image of the portion separated from the optical axis becomes sparse, and the entire inner surface of the can body As a result, there is a problem that uniform inspection cannot be performed and inspection accuracy is lowered.

  In this regard, if the bottom part of the can body is supported by the bottom chuck shown in Patent Document 1 and the image pickup means is arranged so that the optical axis coincides with the axis line of the bottom chuck, the optical axis of the image pickup means is set to the axis of the can body. It can be considered that uniform imaging can be performed over the entire inner circumference of the can body.

  However, in the above-described can body, when the barrel is extended from the bottom into a cylindrical shape by DI molding, a slight shift occurs between the bottom axis and the barrel axis. Further, since the neck portion and the flange portion are molded with reference to the axis of the body portion, the axes of the neck portion and the flange portion are also displaced from the axis of the bottom portion of the can body.

  Therefore, even if the optical axis of the imaging means is aligned with the axis of the bottom of the can body using the bottom chuck, the optical axis is deviated from the inner surface of the body of the can body to be imaged and the axis of the flange. Therefore, a uniform image cannot be obtained over the entire inner surface of the body portion of the can body and the entire circumference of the flange portion, and the inspection accuracy cannot be improved.

  This invention is made in view of such a subject, and can inspect the inner surface and flange part of a can body uniformly over the perimeter, and can inspection which can improve inspection accuracy An object is to provide an apparatus and a can inspection method.

In order to solve the above problems, the present invention proposes the following means.
That is, the can inspection apparatus according to the present invention is a can inspection apparatus that inspects the inner surface of the can body from the opening side of the bottomed cylindrical can body. A suction portion having a concave shape along the outer peripheral surface of the body portion of the can body is formed, a turret that sucks the outer peripheral surface of the body portion by the suction portion and conveys the can body, and the can by the turret An image pickup means for picking up an image of the can body from the opening side when the body is transported to the image pickup position, and the central axis of the radius of curvature R of the suction portion and the optical axis of the image pickup means match It is characterized by.

According to the can inspection apparatus having such a feature, the outer peripheral surface of the body of the can body is adsorbed by the adsorbing portion formed along the outer peripheral surface of the body of the can body, and the radius of curvature R of the adsorbing portion is further increased. Since the optical axis of the image pickup means coincides with the center axis of the can, the center axis of the body of the can body and the optical axis of the image pickup means coincide with each other.
On the other hand, in the case of a can body having a flange portion, since the axis of the flange portion coincides with the axis of the body portion, the axis of the flange portion and the imaging means are absorbed by the body portion of the can body. Will coincide with the optical axis.
Accordingly, since the imaging can be performed in a state where the optical axis of the imaging means is aligned with the axis of the imaging target such as the inner surface of the body portion and the flange portion of the can body, the entire circumference of the inner surface of the body portion of the can body and the flange portion As a result, a uniform image can be obtained.

  The can inspection apparatus according to the present invention further includes one turret, and these turrets are arranged so as to be rotatable around rotation axes parallel to each other and part of the outer circumferences overlap each other. The position where the suction parts face each other is the imaging position, and at the imaging position, each of the suction part of the one turret that has transported the can body and the suction part of the other turret It is characterized by the coincidence of the central axes.

In particular, in a can body in which the neck portion and the flange portion are not molded, the body portion may be bent in an elliptical shape when the can body is viewed from the opening side. When imaging is performed in a state where the body portion of the can body is deformed in this manner, a uniform image cannot be obtained over the entire inner circumference of the body portion of the can body, and the inspection accuracy is biased.
In this regard, according to the can inspection apparatus of the present invention, the can can be adsorbed so that the outer peripheral surface of the body of the can is sandwiched between the pair of adsorbing portions whose central axes of the curvature radii R coincide with each other. The roundness of the body torso can be increased.
That is, since the imaging can be performed in a state where the body portion of the can body is made into a perfect circle shape when viewed from the imaging means, it is possible to obtain an image captured uniformly over the entire inner surface of the body portion of the can body. It is possible to improve the inspection accuracy.

  Furthermore, the can inspection apparatus according to the present invention is characterized in that, at the imaging position, the can is transferred from the suction portion of the one turret to the suction portion of the other turret.

  According to the can inspection apparatus having such a feature, by taking an image at the time of delivery of the can body, for example, even if the turret is stopped due to a failure in one turret, the can that has been imaged It becomes possible to convey to the next process without stagnation of the body.

  Furthermore, the can inspection apparatus according to the present invention is characterized in that the rotation direction of the one turret and the other turret around the rotation axis is opposite.

Here, when the rotation direction of one turret and the other turret is the same direction, the transport direction of the can body is reversed when the can body is transferred from one turret to another turret at the imaging position. Since the direction is changed, a large acceleration acts on the can body, and the axis line of the body portion of the can body at the imaging position and the optical axis of the imaging means are likely to be displaced.
In this regard, since the rotation direction of one turret and the other turret is reversed, the can body can be smoothly delivered without changing the transport direction of the can body at the imaging position. It is possible to suppress the occurrence of a deviation between the axis of the body portion and the optical axis of the imaging means.

  Moreover, in the can inspection apparatus according to the present invention, a plurality of the adsorbing portions are formed on the outer periphery of the turret at equal intervals in the circumferential direction.

According to the can inspection apparatus having such a feature, since a plurality of cans can be continuously conveyed to the imaging position at a constant interval according to the interval between the suction portions, the efficiency can be improved with respect to the plurality of cans. You can check well.
In addition, there is no increase or decrease in the imaging processing time due to clogging of the can bodies, and a certain imaging time can be guaranteed in each can body. Therefore, it is possible to employ an advanced imaging means with an image processing system corresponding to the imaging time, and it is possible to improve inspection accuracy.

  Furthermore, the can inspection apparatus according to the present invention may include a second imaging unit that images the can from the bottom side when the can is transported to the imaging position.

  Since the can inspection apparatus of the present invention is configured to adsorb and hold the outer peripheral surface of the body portion of the can body, a space is secured on the opening side and the bottom side of the can body. Therefore, in the space, the image pickup means can be installed on the opening side of the can body and the second image pickup means can be installed on the bottom side. Thereby, the bottom portion can be imaged together with the inside of the can body, and the inner surface inspection and the bottom portion inspection of the can body can be performed simultaneously.

  The can body inspection method according to the present invention is a can body inspection method for inspecting the inner surface of the can body from the opening side of the bottomed cylindrical can body, and has a concave shape along the outer peripheral surface of the can body. An opening side of the can body by an image pickup means having a first adsorption step of adsorbing the outer peripheral surface of the body portion of the can body by an adsorbing portion formed and an optical axis coinciding with the central axis of the radius of curvature R of the adsorption portion And an imaging step of imaging from the above.

According to the can inspection apparatus having such a feature, the center of the radius of curvature R of the suction portion is obtained in a state where the barrel portion of the can body is sucked by the suction portion having a shape along the outer peripheral surface of the barrel portion of the can body. By imaging with an imaging means having an optical axis that matches the axis, the axis of the body of the can body and the optical axis of the imaging means can be matched.
On the other hand, in the case of a can body having a flange portion, the axis of the flange portion coincides with the axis of the body portion, so that the axis of the flange portion and the imaging means The optical axis can be matched.
Thereby, since it is possible to perform imaging in a state where the optical axis of the imaging means coincides with the axis of the imaging target such as the inner surface of the body portion and the flange portion of the can body, the inner surface of the can body and the entire circumference of the flange portion Thus, a uniform image can be obtained.

  Moreover, in the can body inspection method according to the present invention, the can body is provided between the first suction step and the imaging step by the other suction portion different from the suction portion in the first suction step. The second adsorption step of adsorbing the outer peripheral surface of the body portion from the side opposite to the adsorption portion of the first adsorption step is provided.

In particular, in a can body in which the neck portion and the flange portion are not molded, the body portion may be bent in an elliptical shape when the can body is viewed from the opening side. When imaging is performed in a state where the body portion of the can body is deformed in this manner, a uniform image cannot be obtained over the entire circumference of the can body, and the inspection accuracy is biased.
In this regard, in the can inspection method of the present invention, the roundness of the can body is increased by adsorbing the can body so as to sandwich the body portion of the can body by a pair of adsorbing portions whose central axes of curvature radius R coincide with each other. be able to.
That is, since the imaging can be performed in a state where the body portion of the can body is made into a perfect circle shape when viewed from the imaging means, it is possible to obtain an image captured uniformly over the entire inner surface of the body portion of the can body. It is possible to improve the inspection accuracy.

  Furthermore, in the can body inspection method according to the present invention, in the imaging step, the can body is imaged from the bottom side by a second imaging means.

  In the can inspection method of the present invention, a space is secured on the opening side and bottom side of the can body in order to attract and hold the outer peripheral surface of the body portion of the can body. Therefore, in the space, the image pickup means can be installed on the opening side of the can body and the second image pickup means can be installed on the bottom side. Thereby, the bottom portion can be imaged together with the inside of the can body, and the inner surface inspection and the bottom portion inspection of the can body can be performed simultaneously.

According to the can inspection apparatus and the can inspection method according to the present invention, the image pickup means in which the optical axis coincides with the central axis of the curvature radius R of the suction portion in a state where the body portion of the can body is sucked by the suction portion. By performing the imaging, the optical axis of the imaging means can be made to coincide with the axis of the inner surface of the can body and the flange portion.
As a result, a uniform image can be obtained in the entire circumferential direction of the can body, so that the inspection accuracy can be improved.

It is the schematic of the can manufacturing line to which the can inspection apparatus which concerns on embodiment of this invention was applied. It is a top view of a turret. It is a top view explaining a pair of adjacent turret arrangement relationship. It is a top view which shows the state in which a can body is delivered and conveyed from one turret to another turret. It is sectional drawing of the turret in the 1st imaging position of the state in which the can was adsorbed by the single adsorption | suction part. It is sectional drawing of the turret in the 2nd imaging position of the state in which the can was adsorbed by a pair of adsorption | suction part. It is sectional drawing of a turret at the time of providing the 2nd camera in the 1st imaging position of the state in which the can was adsorbed by the single adsorption | suction part.

Hereinafter, embodiments of a can inspection apparatus and a can inspection method according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a part of the production line of the can body 1 and shows a process portion related to the can body inspection process. The can inspection apparatus 100 according to the present embodiment is incorporated in a part of this line.
In addition, the can body 1 to be inspected in this embodiment has a bottom 1b at one end of a cylindrical body 1a formed by drawing and ironing (DI processing) a metal plate. It has a bottom cylindrical shape.

  As shown in FIG. 1, an introduction path 2 for arranging cans 1 transported in a multi-row state from the previous process in a single row state is arranged in the most upstream part of the line. The can body 1 that has passed through the introduction path 2 is fed into a turret index device 3 provided on the downstream side of the introduction path 2. Further, on the downstream side of the turret index device 3, an unloading path 4 for unloading the cans 1 to the next process one by one is provided.

  The turret index device 3 is a device that conveys the can body 1 with the opening portion facing upward, and is arranged in parallel so as to be continuous from the upstream side to the downstream side of the line. The turret 10 is configured.

  As shown in detail in FIG. 2, the turret 10 has a substantially disk shape having a constant thickness around the rotation axis O, and a plurality of turrets 10 (in this embodiment, 8 in the present embodiment) are equally spaced. ) Can holding recess 11 is formed. The can holding recess 11 has a concave groove shape that is recessed from the outer peripheral side toward the radially inner side and extends in parallel with the rotation axis O across both end surfaces of the turret 10.

  An adsorption portion 12 that can adsorb the can 1 is provided at the bottom of the can holding recess 11. A suction path (not shown in FIG. 2) 12a formed inside the turret 10 is opened on the surface of the suction portion 12, and the suction path 12a sucks air outside the turret 10 so that the can The body 1 is adsorbed to the adsorbing portion 12.

  The shape of the suction portion 12 is a concave surface having a predetermined radius of curvature R and extending parallel to the rotation axis O. The radius of curvature R is equal to the radius of the outer peripheral surface of the body portion 1 a of the can body 1. Match. Further, the length in the cross section perpendicular to the axis of the suction portion 12, that is, the length of the arc line formed by the suction portion 12 is 5% of the circumferential length of the outer peripheral surface of the body portion 1 a of the can body 1. It is said to be -45%. Thereby, when the trunk | drum 1a of the can 1 is attracted | sucked to the adsorption | suction part 12, the part of 5%-45% of the circumferential direction of the trunk | drum 1a of this can 1 adheres to the adsorption | suction part 12 surface, and can The axis of the body portion 1 a of the body 1 coincides with the central axis k of the radius of curvature R of the suction portion 12.

  A plurality of such turrets 10 are continuously arranged with the rotation axis O along the vertical direction, whereby the turret index device 3 of the present embodiment is configured. In this turret index device 3, adjacent turrets 10 are arranged so that a part of their outer peripheral portions overlap each other.

The arrangement relationship of the turrets 10 will be described in detail. As shown in FIG. 3, the central axes k of the radii of curvature R of the respective suction portions 12 coincide with each other at the position where the two turrets 10 are closest. Therefore, when the can body 1 is positioned between the pair of suction portions 12, the can body 1 is sucked by its body portion 1 a contacting the pair of suction portions 12. As a result, the three axes of the axis of the trunk portion 1a of the can 1 and the center of the radius of curvature R of the pair of suction portions 12 coincide with each other.
Further, in this arrangement relationship, the turrets 10 are synchronously rotated around the rotation axis O, and the rotation directions thereof are opposite to each other between the adjacent turrets 10.

  In this turret index device 3, for example, as shown in FIG. 4, the can body 1 adsorbed by the adsorption portion 12 of the turret 10 on one side (left side in FIG. 4) is conveyed by the rotation of the turret 10, When closest to the turret 10 on the other side (right side in FIG. 4) adjacent to the downstream side, the can 1 is sucked into the suction portion 12 of the turret 10 on the other side. At this time, the can 1 is transferred from the turret 10 on one side to the turret 10 on the other side, for example, by stopping the suction in the suction portion 12 of the turret 10 on one side. In this way, in the present embodiment, as shown in FIG. 1, the can 1 is conveyed on the plurality of turrets 10 so as to draw an S shape.

  Further, the plurality of turrets 10 in the turret index device 3 are classified in order from the upstream side into the entry turret 10A, the transport turrets 10B, 10C, 10D, and 10E, the discharge turret 10F, and the exit turret 10G according to their roles. Has been.

The inlet side turret 10 </ b> A is a turret 10 whose outer peripheral portion is connected to the introduction path 2, and the can body 1 is supplied from the introduction path 2 to the can body holding recess 11.
The conveyance turrets 10B, 10C, 10D, and 10E are turrets 10 that sequentially convey the can body 1 delivered from the entry-side turret 10A toward the downstream side. In the present embodiment, the can body inspection apparatus 100 Part of.
The waste turret 10F is a turret 10 having a function of discharging the can body 1 determined to have a defect by the can body inspection apparatus 100 from the line shape.
The exit turret 10G is a turret 10 for guiding the can body 1 that is delivered without being defective and discharged by the discharge turret 10F to the carry-out path 4. The can body 1 adsorbed by the 10G adsorption portion 12 is sent out to the carry-out path 4.

  Next, the can body inspection apparatus 100 will be described. This can inspection apparatus 100 includes the above-described transport turrets 10B, 10C, 10D, and 10E, and a camera (imaging means) 20 disposed at an imaging position P.

  The imaging position P is on a line that transports the can body 1 in the transport turrets 10B, 10C, 10D, and 10E. In the present embodiment, the body portion 1a of the can body 1 is placed on the suction portion 12 of the single turret 10. The first imaging position P1 that is the sucked position (in this embodiment, a total of two places on the line of the transport turret 10B and the transport turret 10C) and the body 1a of the can body 1 are attracted by the two turrets 10. The second imaging position P2 that is the position attracted by the sections 12 and 12 (between the transport turrets 10B and 10C and between the transport turrets 10D and 10E) is selected as the imaging position P. A position other than this may be selected as the imaging position P.

  The camera 20 is disposed at each imaging position P, and for example, a camera having an element such as a CCD is used, and includes a lighting device that irradiates the inner surface of the can 1 that is an imaging target of the camera 20. May be.

As shown in FIG. 5, the camera 20 </ b> A arranged at the first imaging position P <b> 1 can image the inner surface of the can body 1 from the opening side (the upper side in the present embodiment) of the can body 1. It is arranged above the outer peripheral side of the turret 10.
In this arrangement state, the optical axis F of the camera 20A coincides with the central axis k of the radius of curvature R of the suction portion 12 at the first imaging position P1.

On the other hand, as shown in FIG. 6, the camera 20 </ b> B arranged at the second imaging position P <b> 2 can image the inner surface of the can body 1 from the opening side (the upper side in the present embodiment) of the can body 1. Is disposed above the pair of turrets 10.
In this arrangement state, the optical axis F of the camera 20B is made to coincide with the central axis k of each curvature radius R of the pair of suction portions 12 at the second imaging position P2. That is, at the second imaging position P2, the three axes of the central axis k of the suction portions 12 of the turrets 10 on the delivery side and the delivery side of the turret 10 coincide with the optical axis of the camera 20B. It becomes.

  Next, a process in which the can body 1 is conveyed while the inner surface thereof is inspected by the can body inspection method on the line in which the can body inspection apparatus 100 as described above is incorporated will be described.

  As shown in FIG. 1, the can body 1 introduced from the introduction path 2 into the can body holding recess 11 of the entry side turret 10A is conveyed by the rotation of the entry side turret 10A, and the can body of the first conveyance turret 10B. It is delivered to the holding recess 11. At this time, the can 1 has the barrel 1a adsorbed to the suction portion 12 in the can holding recess 11 of the transport turret 10B, and the center axis k of the radius of curvature R of the suction portion 12 and the barrel 1a of the can 1 The axis line is in agreement.

  Next, the can body 1 is transported by the rotation of the transport turret 10B, and the inner surface of the can body 1 is imaged by the camera 20A when passing through the first imaging position P1 shown in FIG.

  At the first imaging position P1, as shown in FIG. 5, the optical axis F of the camera 20A coincides with the central axis k of the radius of curvature R of the suction portion 12 in the turret 10, and further, as described above, the suction portion The central axis k of the radius of curvature R of 12 coincides with the axis of the body portion 1a of the can 1. Therefore, at the first imaging position P1, the optical axis F of the camera 20A is in a state where the axis of the trunk portion 1a of the can body 1 is matched, and in this state, the inner surface of the can body 1 is imaged.

  In this way, at the first imaging position P1, the radius of curvature of the suction portion 12 in a state in which the trunk portion 1a of the can body 1 is sucked by the concave suction portion 12 along the barrel portion 1a of the can body 1. Imaging is performed by the camera 20A having the optical axis F that coincides with the central axis k of R.

  Then, after imaging at the first imaging position P1, when the can body 1 is further rotated and conveyed by the rotation of the conveyance turret 10B, from the first conveyance turret 10B at the second imaging position P2 shown in FIG. The delivery of the can 1 to the second transport turret 10C and the imaging of the inner surface of the can 1 by the camera 20B are performed.

  At the second imaging position P2, the central axes k of the radii of curvature R of the suction portions 12 in the transfer turret 10B on the transfer side of the can body 1 and the transfer turret 10C on the transfer side coincide with each other. Therefore, as shown in FIGS. 3, 4 and 6, the can body 1 has one side of the body portion 1 a adsorbed to the adsorption part 12 of the conveyance turret 10 </ b> B and the opposite side of the one side adsorbs the conveyance turret 10 </ b> C. It will be in the state adsorbed by the part 12. In this state, the body 1a of the can body 1 is in close contact with the suction portions 12 and 12, and the axis of the body 1a of the can body 1 is the center of the radius of curvature R of the pair of suction portions 12 and 12. It coincides with the axis k.

  As shown in FIG. 6, the optical axis F of the camera 20B at the second imaging position P2 coincides with the central axis k of the curvature radius R of the pair of suction portions 12. Therefore, at the second imaging position P2, imaging is performed in a state where the optical axis F of the camera 20B is coincident with the axis of the trunk portion 1a of the can body 1.

  In this way, at the second imaging position P2, the body portion 1a of the can body 1 is sucked from one side by the concave suction portion 12 along the body portion 1a of the can body 1, and the can body 1 is also the same. The central axis k of the radius of curvature R of the pair of suction portions 12 in a state where the barrel portion 1a of the can body 1 is sucked from the opposite side of the one side by the suction portion 12 having a concave shape along the barrel portion 1a. The image is taken by the camera 20A having the optical axis F that coincides with.

  In addition, before and after the delivery of the transport turret 10C from the transport turret 10B of the can 1, the transport turret 10B and the transport turret 10C are rotated in opposite directions, so the transport direction of the can 1 is changed. Smooth delivery is done without being done.

  Then, the can 1 transferred to the second transport turret 10C is imaged in the same manner as described above at the first imaging position P1 provided on the transport line of the transport turret 10C as shown in FIG. , And delivered to the third transport turret 10D. Thereafter, the can 1 is transported by the rotation of the third transport turret 10D, and as shown in FIG. 1, the can body 1 is moved to the second imaging position P2 provided between the third transport turret 10D and the fourth transport turret 10E. Thus, imaging and delivery similar to the above are performed.

  In this manner, image data captured at a total of four locations, that is, two first imaging positions P1 and two second imaging positions P2, are sent to a control unit (not shown), and the control unit analyzes image data. Processing is performed.

In this image data analysis process, comparison with normal data held in advance is performed, and it is determined whether the acquired image data matches the normal data or is within a preset allowable range. If the image data and the normal data match or are within the allowable range, it is determined that the image data is good.
On the other hand, if the image data deviates from the allowable value, it is determined that the inner surface is defective and a signal is sent to the waste turret 10F.

  Then, the can 1 conveyed to the fourth transport turret 10E and delivered to the waste turret 10F is delivered to the can holding recess 11 of the exit turret 10G unless the waste turret 10F receives a signal. Then, after being conveyed by the rotation of the delivery side turret 10G, it is sent to the carry-out path 4 by the air from the air blowing device and carried to the next process.

  On the other hand, when the waste turret 10F receives a signal, the can body 1 determined to be a defective can is discharged out of the line.

  Here, in the can 1 molded by DI processing, a deviation may occur between the axis of the bottom 1b and the axis of the body 1a. Therefore, for example, even when imaging is performed with the optical axis F of the camera 20 aligned with the axis of the bottom 1 b of the can 1, a uniform image can be captured over the entire inner circumference of the can 1. Cannot be performed and the inspection accuracy is reduced.

In this regard, the can body 1 imaged at the first imaging position P1 of the present embodiment is in a state in which the body portion 1a is adsorbed and adhered to the adsorption portion 12, and the optical axis F of the camera 20A is the can body. Imaging is performed in a state where the axes of the one body portion 1a are aligned.
Therefore, even if the can body 1 has a deviation between the axis of the bottom 1b and the axis of the body 1a, the inner surface of the body 1a can be uniformly imaged over the entire circumference. Therefore, the image of the portion close to the optical axis F becomes dense and the image of the portion separated from the optical axis F is not sparse. Thus, a uniform inspection can be performed, and the inspection accuracy can be improved.

  On the other hand, in the can body 1 as in the can body 1 of the present embodiment, the neck portion and the flange portion are not formed. When the can body 1 is viewed from the opening side, the body portion 1a bends in an elliptical shape. Sometimes. If imaging is performed in a state where the body portion 1a of the can body 1 is deformed in this manner, a uniform image over the entire circumference of the can body 1 cannot be obtained, and the inspection accuracy decreases.

In this regard, the body 1a is adsorbed so that the can 1 captured at the second imaging position P2 of the present embodiment is sandwiched by the pair of adsorbing portions 12 having the same center axis k of the curvature radius R. Therefore, the roundness of the trunk portion 1a of the can 1 is increased. That is, imaging can be performed in a state in which the body portion 1a of the can body 1 has a perfect circle shape.
Further, at the second imaging position P2, as described above, the optical axis F of the camera 20B is aligned with the axis of the barrel 1a of the can body 1, so that the inner surface of the barrel 1a extends over the entire circumference. Imaging can be performed uniformly, and the inspection accuracy can be improved.

  In addition, since the can 1 is transferred from the suction part 12 of one turret 10 to the suction part 12 of another turret 10 at the second imaging position P2, for example, a problem occurs in one turret 10 Even when the turret 10 is stopped, the can 1 that has been imaged can be transported to the next process without stagnation, and a reduction in the operating rate of the entire line can be suppressed.

  Here, when the rotation direction of the turret 10 on the delivery side of the can body 1 and the delivery turret 10 are the same direction, the can body 1 is moved from one turret 10 to another turret at the second imaging position P2. When it is transferred to 10, the conveyance direction of the can 1 is changed to the opposite direction. Then, since a large acceleration acts on the can body 1, the axis line of the inner surface of the can body 1 at the second imaging position P2 and the optical axis F of the camera 20B are likely to be displaced, and the image accuracy is lowered.

  On the other hand, since the rotation directions of the adjacent turrets 10 and 10 are opposite to each other as in the present embodiment, the conveyance direction of the can body 1 is not changed at the second imaging position P2. Delivered smoothly. Therefore, it is possible to avoid a deviation between the optical axes of the inner surface of the can 1 and the camera 20B. Thereby, it is possible to perform highly accurate imaging while delivering the can 1 at the second imaging position P2.

Further, in the present embodiment, since each turret 10 has a plurality of can body holding recesses 11 and suction portions 12, a plurality of can bodies 1 are arranged according to the interval between the can body holding recess portions 11 and the suction portions 12. It can be continuously conveyed to the imaging position P at a constant interval. Therefore, it becomes possible to inspect a plurality of cans 1 efficiently.
Furthermore, since each can body 1 is separated for each can body holding recess 11, the length of the imaging process due to the gap between the can bodies 1 being clogged in the line does not occur, and the can body 1 has a constant length. The imaging time can be guaranteed. As a result, an advanced camera 20 with an image processing system according to the imaging time can be employed, and the inspection accuracy can be improved.

  In addition, in this embodiment, since the range of the trunk | drum 1a of this can body 1 closely_contact | adhered to the adsorption | suction part 12 is 5% or more in the circumferential direction, the axis line of the trunk | drum 1a of the can 1 is made into the curvature radius of the adsorption | suction part 12. It is possible to reliably match the central axis k of R. On the other hand, since the range of the body portion 1a of the can body 1 that is in close contact with the suction portion 12 is 45% or less in the circumferential direction, the can body 1 can be smoothly inserted into and removed from the suction portion 12 of the can body holding recess 11. Can do.

  Although the embodiment of the present invention has been described above, the present invention is not limited to this, and can be appropriately changed without departing from the spirit of the present invention. For example, although the adsorption | suction part 12 of embodiment is a thing of the structure which adsorb | sucks the can 1 by the suction path 12a, the thing which employ | adopted the permanent magnet and the electromagnet which attract the can 1 with a magnetic force may be employ | adopted. .

  In the present embodiment, the configuration in which the can body 1 is imaged and delivered at the second imaging position P2 between the turrets 10 has been described. For example, the can body 1 is not delivered and the can body is delivered. A turret 10 for suction that does not contribute to the conveyance of 1 may be provided. By providing the adsorption turret 10, it is possible to take an image while adsorbing the body portion 1 a of the can body 1 with the pair of adsorbing portions 12. Therefore, the roundness of the body portion 1 a of the can body 1 can be increased. Inspection accuracy can be improved.

Furthermore, in the embodiment, the example in which the can body 1 in which the body portion 1a has a cylindrical shape has been described as an inspection object. For example, the can body 1 having a neck portion and a flange portion at the opening portion of the body portion 1a. It is good also as inspection object.
Such a neck part and a flange part are shape | molded by the neck process and flange process performed on the basis of the axis line of the trunk | drum 1a of the can 1, respectively. Therefore, the axes of the neck portion and the flange portion coincide with the axis of the trunk portion 1 a of the can body 1 and deviate from the axis of the bottom portion 1 b of the can body 1.

  Therefore, even in the can body 1 having the neck portion and the flange portion, the body portion 1a of the can body 1 is adsorbed by the adsorbing portion 12, and the camera 20A is attached to the central axis k of the curvature radius R of the adsorbing portion 12. By matching the optical axis F, imaging can be performed in a state where the optical axis F of the camera 20A is aligned with the axis of the neck portion and the flange portion. Therefore, a uniform image can be taken over the entire circumference of the neck portion and the flange portion, and the inspection accuracy can be improved.

Furthermore, as shown in FIG. 7, for example, a second camera (first image) that images the bottom 1b of the can 1 from the bottom 1b side (the lower side in the present embodiment) of the can 1 at the first imaging position P1. 2 imaging means) 21 may be provided. In the can inspection apparatus 100 of the embodiment, since the outer peripheral surface of the body 1a of the can 1 is sucked and held, a space is secured on the bottom 1b side of the can 1 and the second camera 21 can be arranged. By taking an image of the bottom portion 1b of the can body 1 with the second camera 21, it is possible to inspect the bottom portion 1b of the can body 1 simultaneously with the inspection of the inner surface of the body portion 1a of the can body 1.
Note that the second camera 21 may be provided on the bottom 1b side of the can 1 at the second imaging position P2. Also by this, the bottom 1b can be inspected simultaneously with the inspection of the inner surface of the can 1 by capturing an image of the bottom 1b of the can 1 at the second imaging position P2.

DESCRIPTION OF SYMBOLS 1 Can body 1a trunk | drum 1b bottom part 2 introduction path 3 turret index apparatus 4 unloading path 10 turret 10A entrance side turret 10B conveyance turret 10C conveyance turret 10D conveyance turret 10E conveyance turret 10G discharge side turret 11 can body holding recess 12 adsorption Part 12a Suction path 20 Camera (imaging means)
20A camera (imaging means)
20B camera (imaging means)
21 Camera (second imaging means)
100 Can inspection apparatus k Center axis O Rotation axis P Imaging position P1 First imaging position P2 Second imaging position R Curvature radius

Claims (8)

A can body inspection device that inspects the inner surface of the can body from the opening side of the bottomed can body,
A suction part having a concave shape along the outer peripheral surface of the body part of the can body is formed on the outer peripheral part of the rotatable disk shape, and the outer surface of the body part is adsorbed by the suction part to remove the can body. A turret to carry,
An imaging means for imaging the can body from the opening side when the can body is conveyed to the imaging position by the turret;
A can body inspection apparatus, wherein a central axis of a radius of curvature R of the suction portion and an optical axis of the imaging means coincide with each other. One more turret,
These turrets are arranged so that they can rotate around rotation axes that are parallel to each other and part of the outer periphery overlaps each other,
The position where the suction parts face each other is the imaging position,
2. The can according to claim 1, wherein the central axes of the suction portion of one turret that has transported the can body and the suction portion of another turret coincide with each other at the imaging position. Physical examination device.   3. The can inspection apparatus according to claim 2, wherein, at the imaging position, the can body is transferred from the suction portion of the one turret to the suction portion of the other turret.   The can body inspection apparatus according to any one of claims 1 to 3, wherein a plurality of the suction portions are formed on the outer peripheral portion of the turret at equal intervals in the circumferential direction.   5. The can body according to claim 1, further comprising: a second imaging unit configured to image the can body from a bottom side when the can body is conveyed to the imaging position. Inspection device. A can body inspection method for inspecting the inner surface of the can body from the opening side of the bottomed can body,
A first adsorption step of adsorbing the outer peripheral surface of the body portion of the can body by a concave adsorbing portion along the outer peripheral surface of the can body;
A can body inspection method comprising: an image pickup step of picking up an image from an opening side of the can body by an image pickup means having an optical axis coinciding with a central axis of a radius of curvature R of the suction portion. Between the first adsorption step and the imaging step,
The second adsorption step of adsorbing the outer peripheral surface of the barrel portion of the can body from the opposite side of the adsorption portion of the first adsorption step by the adsorption portion other than the adsorption portion in the first adsorption step. The can body inspection method according to claim 6.   The can inspection method according to claim 6 or 7, wherein in the imaging step, the can is imaged from the bottom side by a second imaging means.

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