JP5127781B2 - Internal inspection method for square cans - Google Patents
Internal inspection method for square cans Download PDFInfo
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- JP5127781B2 JP5127781B2 JP2009145343A JP2009145343A JP5127781B2 JP 5127781 B2 JP5127781 B2 JP 5127781B2 JP 2009145343 A JP2009145343 A JP 2009145343A JP 2009145343 A JP2009145343 A JP 2009145343A JP 5127781 B2 JP5127781 B2 JP 5127781B2
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- 238000000034 method Methods 0.000 title claims description 22
- 238000007689 inspection Methods 0.000 title description 12
- 230000005484 gravity Effects 0.000 claims description 13
- 238000005286 illumination Methods 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 241000209094 Oryza Species 0.000 description 2
- 235000007164 Oryza sativa Nutrition 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 235000009566 rice Nutrition 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Description
本発明は、角缶の内面検査方法に関し、特には金属製の角缶の内面に施された塗料等の表面処理膜の状態を検査する角缶の内面検査方法に関する。 The present invention relates to a method for inspecting the inner surface of a square can, and more particularly to a method for inspecting the inner surface of a square can that inspects the state of a surface treatment film such as a paint applied to the inner surface of a metal square can.
一般に角缶は、底部を有する正方形状の缶胴の開口部を缶蓋で閉塞した構造のものであり、鉄製やアルミニウム製で作られるのが一般的である。そして、角缶の製造においては、その内面に塗料等で内面処理を施し、これにより内面の保護と内容物の変化を防止している。この内面処理が完全に施され良好な状態であるか否かの検査として種々の内面検査が行われている。 In general, a square can has a structure in which an opening of a square can body having a bottom is closed with a can lid, and is generally made of iron or aluminum. And in manufacture of a square can, the inner surface is given the inner surface process with the paint etc., thereby preventing the inner surface protection and the change of the contents. Various inner surface inspections are performed as an inspection of whether or not the inner surface treatment is completely performed and in a good state.
従来、缶の内面検査方法として、缶内をカメラで撮影する方法は、特許文献１（特開２００５−３１５６９８号公報），特許文献２（特開平６−３４７４０８号公報），特許文献３（特開２００８−２４１６４９号公報），特許文献４（特開平９−２８８０６７号公報）等が開示されている。 Conventionally, as a method for inspecting the inner surface of a can, a method of photographing the inside of the can with a camera is disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2005-315698), Patent Document 2 (Japanese Patent Laid-Open No. 6-347408), and Patent Document 3 (special Japanese Patent Application Laid-Open No. 6-347408). JP 2008-241649), Patent Document 4 (Japanese Patent Laid-Open No. 9-288067), and the like are disclosed.
これらの特許文献において、先ず特許文献１の検査方法は、缶体の内面を撮影するのに、缶体の開口側からリング状の照明で内面に投光させ、カメラで内面を撮影するものである（図７参照）。 In these patent documents, first, the inspection method of Patent Document 1 is to shoot the inner surface of the can body from the opening side of the can body by projecting the inner surface with ring-shaped illumination and photographing the inner surface with a camera. Yes (see FIG. 7).
また、特許文献２では、缶の内面の撮影が、複数の内面用カラーラインセンサカメラで缶の外から撮影している。 Moreover, in patent document 2, imaging | photography of the inner surface of a can is image | photographed from the outside of a can with the several color line sensor camera for inner surfaces.
また、特許文献３では、特許文献１と同様に缶の開口側からリング状の照明で内面を照明し、缶の開口から缶の内面を撮影する方法である。 In Patent Document 3, as in Patent Document 1, the inner surface is illuminated with ring-shaped illumination from the opening side of the can, and the inner surface of the can is photographed from the opening of the can.
更に、特許文献４では、回動自在な支持桿に取付けた照明灯と複数のＣＣＤカメラをドラム缶内に挿入して、各カメラによりドラム缶内の撮影分担領域を撮影する方法である。 Further, Patent Document 4 is a method in which an illumination lamp and a plurality of CCD cameras attached to a rotatable support rod are inserted into a drum can, and a photographing share area in the drum can is photographed by each camera.
しかしながら、上記特許文献１、２及び３に開示された缶内の撮影方法は、いずれも缶の外側から開口側に向けたカメラで缶内を撮影するため、缶内の隅々を隈なく撮影できず、しかも、缶の外側からでは、缶内面の小さな不良箇所を鮮明に撮影することが極めて困難であり、正確な撮影データーが得られないという問題点があった。 However, since all of the photographing methods in the cans disclosed in Patent Documents 1, 2, and 3 photograph the inside of the can with a camera directed from the outside of the can toward the opening side, the entire can is photographed without any problems. In addition, from the outside of the can, it is extremely difficult to clearly photograph a small defective portion on the inner surface of the can, and there is a problem that accurate photographing data cannot be obtained.
また、特許文献４の検査方法においては、缶内を撮影するのにカメラを缶内に挿入して撮影するが、挿入するカメラの位置はドラム缶の口栓からのものであり、その口栓は天板の中心から偏心して位置し、この状態でカメラを動かして缶内を撮影すると、カメラの位置と缶の各内面までの位置が刻々変化し、カメラの焦点距離も変化して焦点が合わなくなる不具合が生じ、特に角缶の場合にはこの状態が著しい。従って、角缶では缶内面の鮮明な画像が得られないという同様な問題点を有していた。 Further, in the inspection method of Patent Document 4, the camera is inserted into the can to photograph the inside of the can, and the position of the camera to be inserted is from the mouthpiece of the drum can. When the camera is moved in this state and the inside of the can is photographed in this state, the camera position and the position to each inner surface of the can change every moment, and the focal length of the camera also changes and focuses. This is a problem, especially in the case of square cans. Therefore, the square can has a similar problem that a clear image of the inner surface of the can cannot be obtained.
本発明は、カメラを角缶内の形状に合わせて動かし、移動する撮影中のカメラが常に角缶内と等距離で撮影でき、鮮明な画像が得られる角缶の内面検査方法を提供するにある。 The present invention provides a method for inspecting the inner surface of a square can that moves the camera in accordance with the shape in the square can and can always photograph the moving camera at the same distance as the inside of the square can and obtain a clear image. is there.
本発明の他の目的は、角缶内の隅々まで隈なく短時間で鮮明に撮影できることである。 Another object of the present invention is to capture a clear image in a short time without any defects in every corner of the square can.
本発明は、外形がルーローの三角形状の回転体（１）を、倣カム（２）に穿設した前記回転体（１）の外幅を一辺とする正方形の角穴（2a）内に、回転自在に設け、且つ、前記回転体（１）から突出させると共に前記回転体（１）のルーローの三角形状に対して重心および頂部の向きを一致させたカメラ保持体（３）を備え、このカメラ保持体（３）に対して、その頂部の側面に配した側面用ラインカメラ（4a）と、先端面の頂部から重心に向けて配した底面用ラインカメラ（4b）とから少なくとも成る撮影手段（４）を用い、この撮影手段（４）を角缶（Ａ）内に挿入した状態で、前記回転体（１）の重心を駆動手段（５）で偏心回転させながら前記側面用ラインカメラ（4a）と底面用ラインカメラ（4b）とで前記角缶（Ａ）内を撮影し、この撮影した画像データーを基に、画像判定手段（６）で角缶（Ａ）内面の良否を判定することを特徴とする。 According to the present invention, a triangular rotating body (1) having an outer shape of a roule is placed in a square square hole (2a) having an outer width of the rotating body (1) perforated in the copying cam (2) as one side. A camera holder (3) provided rotatably, and projecting from the rotating body (1) and having the center of gravity and the direction of the top aligned with the triangular shape of the rouleau of the rotating body (1), An imaging means comprising at least a side line camera (4a) arranged on the top side of the camera holder (3) and a bottom line camera (4b) arranged from the top of the tip to the center of gravity. (4), with the photographing means (4) inserted into the square can (A), the side line camera (5) is rotated while the center of gravity of the rotating body (1) is eccentrically rotated by the driving means (5). 4a) and the bottom line camera (4b) photograph the inside of the square can (A). Based on the photographed image data, the image judging means (6) judges the quality of the inner surface of the square can (A).
また、前記角缶（Ａ）内の撮影が、前記カメラ保持体（３）の頂部先端の隅部に設けた隅用ラインカメラ（4c）を加えた前記撮影手段（４）を用い、この追加した隅用ラインカメラ（4c）で角缶（Ａ）内の底隅部も同時に撮影するのが好ましい。 Further, the inside of the square can (A) is photographed by using the photographing means (4) to which a corner line camera (4c) provided at the corner of the top end of the camera holder (3) is added. It is preferable that the bottom corner in the square can (A) is simultaneously photographed with the corner line camera (4c).
本発明でいうルーローの三角形状とは、正三角形の各頂点を中心に半径がその正三角形の一辺となる円弧で結んでできるおむすび形をした定幅図形をいう。 In the present invention, the Roule triangular shape refers to a rice ball-shaped constant width figure formed by connecting each vertex of an equilateral triangle with an arc whose radius is one side of the equilateral triangle.
また、本発明の回転体（１）は、正面の外形が前記ルーローの三角形状で一定の厚さを有するものであり、この回転体（１）は、その円弧の半径を一辺とする正方形の中で回転することができ、その際に回転体（１）の各頂部は略正方形の軌跡を画いて移動する。 Further, the rotating body (1) of the present invention has a triangular shape of the front and has a certain thickness, and the rotating body (1) has a square shape with a radius of the arc as one side. The top of the rotating body (1) moves in a substantially square locus.
また、本発明の撮影手段（４）でラインカメラとは、一度に一列分の画像を連続して撮影するラインセンサカメラをいう。そして、本発明の撮影手段（４）は、側面用ラインカメラ（4a）及び底面用ラインカメラ（4b）が角缶（Ａ）内を幅広くスキャンできるイメージセンサが好ましく、特にはイメージセンサヘッドに光源を内蔵した細長タイプのもの、例えばキャノン・コンポーネンツ株式会社製のコンタクトイメージセンサ（ＦＦシリーズ）が好ましい。更に、隅用ラインカメラ（4c）は、幅広くスキャンする必要がないため、細長タイプのものでなく、矩形タイプのものが好ましい。 Further, the line camera in the photographing means (4) of the present invention means a line sensor camera that continuously photographs one row of images at a time. The photographing means (4) of the present invention is preferably an image sensor that allows the side line camera (4a) and the bottom line camera (4b) to scan the inside of the square can (A) widely. For example, a contact type image sensor (FF series) manufactured by Canon Components Inc. is preferable. Furthermore, since the corner line camera (4c) does not need to scan widely, it is preferably a rectangular type rather than an elongated type.
本発明の角缶の内面検査方法は、外形がルーローの三角形状の回転体（１）を、倣カム（２）に穿設した回転体（１）の外幅を一辺とする正方形の角穴（2a）内に、回転自在に設け、この回転体（１）から突出させると共に、回転体（１）のルーローの三角形状に対して重心および頂部の向きを一致させたカメラ保持体（３）を備え、このカメラ保持体（３）に対して、その頂部の側面に配した側面用ラインカメラ（4a）と、先端面の頂部から重心に向けて配した底面用ラインカメラ（4b）とから少なくとも成る撮影手段（４）を用い、この撮影手段（４）を角缶（Ａ）内に挿入した状態で、回転体（１）の重心を偏心回転させながら撮影手段（４）で撮影するため、側面用ラインカメラ（4a）は、正方形の角缶（Ａ）の側面に沿って正方形状に移動し、角缶（Ａ）の側面との距離を一定に保持しながら撮影することができる。 The method for inspecting the inner surface of a square can according to the present invention is a square square hole having an outer width of a rotating body (1) having an outer shape of a roule as a side formed in a copying cam (2). (2a) A camera holder (3) which is rotatably provided and protrudes from the rotating body (1) and whose center of gravity and the direction of the top coincide with the triangular shape of the roulau of the rotating body (1). A side line camera (4a) arranged on the top side of the camera holder (3) and a bottom line camera (4b) arranged from the top of the tip toward the center of gravity. In order to photograph with the photographing means (4) while rotating the center of gravity of the rotating body (1) eccentrically with the photographing means (4) comprising at least the photographing means (4) being inserted into the square can (A). The side line camera (4a) has a square shape along the side of the square can (A). Move and can be taken while maintaining the distance between the side surface of Sumikan (A) constant.
この際に、角缶（Ａ）の側面の四隅は丸味を呈しているが、ルーローの三角形状では、その頂部の移動軌跡が四隅に丸味を呈する正方形状であるので、この丸味は角缶（Ａ）側面の四隅の丸味と相似し、この四隅の撮影も一定距離を保持しながら撮影できる。同様に、底面用ラインカメラ（4b）は、角缶（Ａ）の四角面に沿って移動するので、四隅が丸い正方形状の底面であっても、その全面を等距離から撮影できる。 At this time, the four corners of the side surface of the square can (A) are rounded. However, in the triangular shape of the rouleau, the movement trajectory of the top is a square shape with rounded corners. A) Similar to the roundness of the four corners on the side, the four corners can be shot while maintaining a certain distance. Similarly, since the bottom line camera (4b) moves along the square surface of the square can (A), even if the bottom surface has a square shape with rounded corners, the entire surface can be photographed from the same distance.
従って、本発明の撮影方法では、角缶（Ａ）の側面および底面を隈なく鮮明に撮影することが可能となり、その撮影時間も回転体（１）の１回転でもって、角缶（Ａ）内の側面と底面の撮影が極めて短時間にでき、搬送ライン上に連続的に流れる各角缶（Ａ）の内面検査にも充分対応できる。 Therefore, in the photographing method of the present invention, it is possible to photograph the side and bottom of the square can (A) clearly and without any wrinkles, and the photographing time is one rotation of the rotating body (1), and the square can (A) The inner side surface and the bottom surface can be imaged in a very short time, and the inner surface inspection of each square can (A) continuously flowing on the conveying line can be sufficiently handled.
また、撮影された画像データーは画像判定手段（６）で角缶（Ａ）内の良否を瞬時に判定でき、判別作業が極めて簡単となる。 The taken image data can be immediately judged by the image judging means (6) to determine whether the square can (A) is good or not, and the discrimination work becomes extremely simple.
更に、本発明の請求項２では、角缶（Ａ）内の底隅部も撮影できるので、角缶（Ａ）内の全域に渡って隈なく撮影でき、検査の正確性が極めて高くなる。 Further, according to the second aspect of the present invention, since the bottom corner portion in the square can (A) can be photographed, it can be photographed over the entire area in the square can (A), and the accuracy of the inspection becomes extremely high.
また、本発明の撮影がラインカメラを使用し、一定距離で撮影するので、角缶（Ａ）内の１周分すべてのピントが合い鮮明な画像データーが得られ、角缶（Ａ）内の微小なキズや欠陥が発見できる。 In addition, since the shooting according to the present invention uses a line camera and shoots at a certain distance, the entire image in the square can (A) is in focus, and clear image data is obtained. Small scratches and defects can be found.
以下、本発明の実施の形態の角缶の内面検査方法について図面を基に説明する。 Hereinafter, a method for inspecting an inner surface of a square can according to an embodiment of the present invention will be described with reference to the drawings.
図１において、（Ａ）は角缶であり、特には金属角缶の１斗缶を対象とするものである。この角缶（Ａ）は、缶胴に底蓋を巻締めて取付けた状態のもので、その内面には塗料，メッキ等で表面処理されている。本発明では、この表面処理された角缶（Ａ）内をカメラで撮影し、内面の検査をする方法である。 In FIG. 1, (A) is a square can, and in particular, a single can of a metal square can. This square can (A) is in a state where a bottom lid is wound and attached to a can body, and its inner surface is surface-treated with paint, plating or the like. In the present invention, the surface treated square can (A) is photographed with a camera to inspect the inner surface.
以下、この検査方法について、その撮影の手段を説明すると、先ず、（１）は外形がルーローの三角形状をした回転体であり、一定の厚さを有している。この回転体（１）は、図１及び２に示すように、外形がルーローの三角形状のものであり、つまり、正三角形の各頂部（ロ）を中心に半径がその正三角形の一辺となる円弧で結んでできるおむすび状の形状をした定幅図形のものである。この回転体（１）の重心（イ）位置には、回転軸（1a）が突出し、この回転軸（1a）を駆動手段（５）で偏心回転させる。 Hereinafter, the photographing means of this inspection method will be described. First, (1) is a rotating body having a triangular shape whose outer shape is Lulaw, and has a certain thickness. As shown in FIGS. 1 and 2, the rotating body (1) has a triangular shape with a rouleau, that is, the radius is one side of the equilateral triangle centering on each apex (b) of the equilateral triangle. It is a constant-width figure in the shape of a rice ball formed by connecting with arcs. The rotating shaft (1a) protrudes at the center of gravity (A) position of the rotating body (1), and the rotating shaft (1a) is eccentrically rotated by the driving means (5).
（２）は倣カムであり、この倣カム（２）には、回転体（１）の外幅を一辺とする正方形の角穴（2a）が穿設され、この角穴（2a）の下部に角穴（2a）より狭い相似形の支持枠（2b）を形成している（図２参照）。この倣カム（２）の角穴（2a）内に回転体（１）が回転自在に設けられ、支持枠（2b）で安定保持されている。 (2) is a copying cam. In this copying cam (2), a square hole (2a) having an outer width of the rotating body (1) as one side is formed, and a lower portion of the hole (2a) is formed. A support frame (2b) having a similar shape narrower than the square hole (2a) is formed (see FIG. 2). The rotating body (1) is rotatably provided in the square hole (2a) of the copying cam (2), and is stably held by the support frame (2b).
また、回転体（１）には、図３に示すように、回転軸（1a）を設けた面と反対の面から突出するカメラ保持体（３）が設けられている。このカメラ保持体（３）は、回転体（１）の各頂部（ロ）内側から垂直に設けた細長なカメラ支持部材（3a）と、この三本のカメラ支持部材（3a）の先端に設けた回転体（１）と相似形のカメラ取付け板（3b）とから成り、このカメラ保持体（３）は、その重心及び頂部が、回転体（１）のルーローの三角形状に対して、回転体（１）の重心（イ）位置および頂部（ロ）の向きと一致させている。従って、カメラ取付け板（3b）はカメラ保持体（３）の頂部の側面に位置させている。 Further, as shown in FIG. 3, the rotating body (1) is provided with a camera holding body (3) protruding from a surface opposite to the surface on which the rotating shaft (1a) is provided. The camera holder (3) is provided at the tip of the elongated camera support member (3a) provided vertically from the inside of each top (b) of the rotating body (1) and the three camera support members (3a). The rotating body (1) is similar to the camera mounting plate (3b), and the camera holder (3) has a center of gravity and a top that rotate relative to the Rouleau triangle of the rotating body (1). The center of gravity (b) of the body (1) and the direction of the top (b) are matched. Accordingly, the camera mounting plate (3b) is positioned on the side surface of the top of the camera holder (3).
このカメラ保持体（３）には、そのカメラ支持部材（3a）に角缶（Ａ）の側面内を撮影するための側面用ラインカメラ（4a）を配して取付け、カメラ取付け板（3b）に角缶（Ａ）の底面内を撮影するための底面用ラインカメラ（4b）を配して取付けている。更に説明すると、カメラ保持体（３）に取付ける側面用ラインカメラ（4a）と底面用ラインカメラ（4b）は、一度に一列分の画像を連続して撮影可能なラインセンサカメラが使用され、光源を内蔵した細長タイプのものを使用するのが好ましい。 A side line camera (4a) for photographing the inside of the side surface of the square can (A) is attached to the camera support (3a) on the camera support member (3a) and attached to the camera support plate (3b). The bottom line camera (4b) for photographing the inside of the bottom of the square can (A) is arranged and attached. More specifically, the side line camera (4a) and the bottom line camera (4b) to be attached to the camera holder (3) are line sensor cameras that can continuously capture one row of images at a time. It is preferable to use an elongated type having a built-in.
また、側面用ラインカメラ（4a）は一斗缶のように角缶（Ａ）の高さが深い場合、図示しないが、一本のカメラ支持部材（3a）の上下に別けて２台の側面用ラインカメラ（4a）を取付け、他の一本のカメラ支持部材（3a）の中間に１台の側面用ラインカメラ（4a）を取付けておくと、短いラインカメラが使用できると共に、この３台のラインカメラで角缶（Ａ）の側面全体が撮影できる。 In addition, the side line camera (4a) is not shown when the square can (A) is deep like the Ito can, but it is separated from the top and bottom of one camera support member (3a). If a line camera (4a) is installed and one side line camera (4a) is installed in the middle of another camera support member (3a), a short line camera can be used. The entire side of the square can (A) can be photographed with this line camera.
次に、回転体（１）の駆動手段（５）について図１及び図４を基に説明すると、回転体（１）を回転させるために、その重心（イ）に突出した回転軸（1a）を回転させると、回転軸（1a）は偏心しながら回転する。従って、これを解決するのに、回転体（１）の回転軸（1a）は、駆動手段（５）である回転駒（5a）の下面に穿設させた細長な溝穴（5b）に挿入され、回転駒（5a）の回転軸（5c）を駆動モーター（5d）で駆動させている。つまり、駆動手段（５）は、下面に穿設した細長な溝穴（5b）を有する回転駒（5a）と、その回転駒（5a）から突出する回転軸（5c）と、この回転軸（5c）と連結した駆動モーター（5d）とから成る。 Next, the drive means (5) of the rotating body (1) will be described with reference to FIGS. 1 and 4. In order to rotate the rotating body (1), the rotating shaft (1a) protruding from the center of gravity (A). When the is rotated, the rotating shaft (1a) rotates while being eccentric. Therefore, to solve this, the rotating shaft (1a) of the rotating body (1) is inserted into an elongated slot (5b) drilled in the lower surface of the rotating piece (5a) as the driving means (5). Then, the rotating shaft (5c) of the rotating piece (5a) is driven by the driving motor (5d). That is, the drive means (5) includes a rotating piece (5a) having an elongated slot (5b) drilled in the lower surface, a rotating shaft (5c) protruding from the rotating piece (5a), and the rotating shaft ( 5c) and a drive motor (5d) connected to it.
この駆動手段（５）で回転体（１）の回転軸（1a）を回転させると、回転軸（1a）は回転駒（5a）の回転により回転されるが、その際に回転軸（1a）は溝穴（5b）内を移動できるので偏心しながら回転され、この回転軸（1a）の回転で、回転体（１）が回転される。尚、この回転駒（5a）を使用した駆動手段（５）は、あくまで一例であって、これに限定されず、他の例として、図示しないが、回転体（１）の回転軸（1a）と駆動モーター（5d）間をユニバーサルジョイントで連結したもの、あるいは歯車機構を使用した駆動手段（５）でもよい。 When the rotating shaft (1a) of the rotating body (1) is rotated by the driving means (5), the rotating shaft (1a) is rotated by the rotation of the rotating piece (5a). At this time, the rotating shaft (1a) Since it can move in the slot (5b), it is rotated while being eccentric, and the rotating body (1) is rotated by the rotation of the rotating shaft (1a). The driving means (5) using the rotating piece (5a) is merely an example, and is not limited thereto. As another example, although not shown, the rotating shaft (1a) of the rotating body (1) is used. And the driving motor (5d) may be connected by a universal joint, or driving means (5) using a gear mechanism may be used.
また、これらの回転体（１），倣カム（２），カメラ保持体（３），撮影手段（４），駆動手段（５）は一体的に構成され、これら全体がシリンダー等（図示せず）で上下移動させることも可能である。 Further, the rotating body (1), the copying cam (2), the camera holding body (3), the photographing means (4), and the driving means (5) are integrally configured, and the whole is a cylinder or the like (not shown). ) Can be moved up and down.
次に、本発明の角缶（Ａ）内の撮影方法について説明すると、先ず、角缶（Ａ）内にカメラ保持体（３）に取付けた撮影手段（４）を挿入した状態でもって、駆動モーター（5d）を駆動させると、それと回転軸（5c）で連結された回転駒（5a）が回転され、その溝穴（5b）に挿入された回転軸（1a）も偏心回転して回転体（１）が倣カム（２）の角穴（2a）に倣って回転する。この際に、回転体（１）の頂部（ロ）は、略正方形状の軌跡で移動する。従って、この回転体（１）の回転でカメラ保持体（３）に取付けた撮影手段（４）も、略正方形状に移動しながら角缶（Ａ）内を撮影する。具体的には、側面用ラインカメラ（4a）は角缶（Ａ）の正方形の側面内周に沿って一定距離で撮影でき、底面用ラインカメラ（4b）は角缶（Ａ）の底面内を、その正方形状に沿って上方から一定距離で撮影される。 Next, the photographing method in the square can (A) according to the present invention will be described. First, the photographing means (4) attached to the camera holder (3) is inserted into the square can (A) and driven. When the motor (5d) is driven, the rotating piece (5a) connected to the rotating shaft (5c) is rotated, and the rotating shaft (1a) inserted into the slot (5b) is also eccentrically rotated to rotate the rotating body. (1) rotates following the square hole (2a) of the copying cam (2). At this time, the top (b) of the rotating body (1) moves along a substantially square locus. Accordingly, the photographing means (4) attached to the camera holder (3) by the rotation of the rotating body (1) also photographs the inside of the square can (A) while moving in a substantially square shape. Specifically, the side line camera (4a) can shoot at a fixed distance along the square side inner periphery of the square can (A), and the bottom line camera (4b) is inside the square can (A). The photograph is taken at a certain distance from above along the square shape.
しかも、角缶（Ａ）の側面及び底面の四隅は丸味を呈しているが、回転体（１）の頂部（ロ）の回転軌跡は正方形状の四隅が丸味を呈するので、これが丁度角缶（Ａ）の丸味のある四隅と略一致し、撮影手段（４）が丸味のある角缶（Ａ）の四隅も良好に撮影できるのである。 Moreover, the four corners of the side surface and bottom surface of the square can (A) are rounded, but the rotation locus of the top (b) of the rotating body (1) is rounded at the four corners of the square, so this is just a square can ( The four corners of the rounded corner can (A) can be well photographed by the photographing means (4).
尚、撮影する際に、角缶（Ａ）の内面と撮影手段（４）との距離は、５mm〜１５mm程度の範囲であり、好ましくは、角缶（Ａ）内の凹凸の関係上、７mm〜１３mmの範囲がスキャンするのに適している。 When photographing, the distance between the inner surface of the square can (A) and the photographing means (4) is in the range of about 5 mm to 15 mm, preferably 7 mm because of the unevenness in the square can (A). A range of ˜13 mm is suitable for scanning.
また、本発明の請求項２では、角缶（Ａ）の底面側の隅部を明確に撮影できるように、側面用ラインカメラ（4a）と底面用ラインカメラ（4b）と共に、カメラ保持体（３）の頂部先端の隅部に設けた隅用ラインカメラ（4c）を加えた撮影手段（４）を用いて、この追加した隅用ラインカメラ（4c）で角缶（Ａ）内の底隅部も同時に撮影できるようにしている。これにより、角缶（Ａ）内の隅々まで隈なく撮影することが可能となり、より正確な撮影の画像データーが得られる。 Further, according to the second aspect of the present invention, the camera holder (4a) and the bottom line camera (4b) are used together with the camera holder so that the corner on the bottom side of the square can (A) can be clearly photographed. Using the photographing means (4) with the addition of the corner line camera (4c) provided at the corner of the top end of 3), the bottom corner in the square can (A) is added with the added corner line camera (4c). The department can also shoot at the same time. As a result, it is possible to shoot all the corners of the square can (A), and more accurate image data can be obtained.
尚、この隅用ラインカメラ（4c）は、撮影のエリアが狭いので、矩形のものでよい。 The corner line camera (4c) may have a rectangular shape because the photographing area is narrow.
このようにして側面用ラインカメラ（4a）及び底面用ラインカメラ（4b）で撮影して得られた画像データーは、図６に示すように、画像判定手段（６）に送られ、この画像判定手段（６）でもって瞬時に角缶（Ａ）内の良否を判定する。この画像判定手段（６）としては、例えば予め撮影した正常な基準画像データーとカメラ（4a）,(4b）から得られた画像データーとを比較し、良否を判定する手段、あるいは得られた画像データーを分析し、部分的な色調や明度の変化の度合で良否を判定する手段等にすればよいが、必ずしもこれらの判定手段に限定されない。尚、隅用ラインカメラ（4c）の画像データーについても同様に判定される。 The image data obtained by photographing with the side line camera (4a) and the bottom line camera (4b) in this way is sent to the image judging means (6) as shown in FIG. The quality in the square can (A) is determined instantaneously by means (6). As this image determination means (6), for example, normal reference image data taken in advance and image data obtained from the cameras (4a) and (4b) are compared to determine whether or not the image is obtained. The data may be analyzed and used as a means for determining pass / fail by the degree of partial color tone or brightness change, but is not necessarily limited to these determination means. Note that the image data of the corner line camera (4c) is similarly determined.
また、本発明の検査方法においては、その使用について、角缶（Ａ）の搬送ラインに設置でき、本発明の回転体（１），倣カム（２），カメラ保持体（３），撮影手段（４），駆動手段（５）とが一体的に構成しているため、これら全体をシリンダー等の移動手段でもって上下移動すれば、角缶（Ａ）の内面検査が自動化でき、良品な角缶の大量生産が可能となる。 Further, in the inspection method of the present invention, the use can be installed in the conveyance line of the square can (A), and the rotating body (1), the copying cam (2), the camera holder (3), and the photographing means of the present invention. (4) Since the drive means (5) are integrated with each other, if the whole is moved up and down with a moving means such as a cylinder, the inner surface inspection of the square can (A) can be automated, and a good corner Enables mass production of cans.
１ 回転体
２ 倣カム
2a 角穴
３ カメラ保持体
４ 撮影手段
4a 側面用ラインカメラ
4b 底面用ラインカメラ
4c 隅用ラインカメラ
５ 駆動手段
６ 画像判定手段
Ａ 角缶
1 Rotating body 2 Copy cam
2a Square hole 3 Camera holder 4 Photographing means
4a Line camera for side
4b Bottom line camera
4c Corner line camera 5 Driving means 6 Image judging means A Square can
Claims (2)
The corner can (A) is photographed by using the photographing means (4) including a corner line camera (4c) provided at the corner of the top end of the camera holder (3). The method for inspecting the inner surface of a square can according to claim 1, wherein the bottom corner in the square can (A) is simultaneously photographed by the line camera (4c).
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