JP3557372B2

JP3557372B2 - Can winding sorter

Info

Publication number: JP3557372B2
Application number: JP22292699A
Authority: JP
Inventors: 邦友小舩
Original assignee: 日立エンジニアリング株式会社
Priority date: 1999-08-05
Filing date: 1999-08-05
Publication date: 2004-08-25
Anticipated expiration: 2019-08-05
Also published as: JP2001050716A

Description

【０００１】
【発明の属する技術分野】
生産ライン中で缶蓋巻締め後に発生する巻締め全周に関わる巻締め不良の検出及び、巻締め状況を監視選別する選別装置に関する。
【０００２】
【従来の技術】
シーミング装置によって形成される缶蓋や缶底巻締め部の巻締め状態はその缶自体の品質や、ひいては缶内収納製品の品質に大きく関わっており、シーマヘッドの調整の状況次第であることから缶巻締め厚さの計測検査は必須である。缶巻締め厚さＴは図６の缶巻締め厚さ断面と各部名称を示す図に示す通り、缶蓋や缶底を巻締めたシーミングウォール、シーミングウォール・ラジアス、シーミングパネル、シーミングパネル・ラジアスの台形部分の幅であり、シーミングウォールの最も膨らんだ部位とチャックウォール面の傾きと平行に立ち上がった部位との間の寸法を言う。
【０００３】
一般的には巻締め状態の検査のため一定時間毎に生産ラインからシーミング装置のシーマヘッドの数分をラインアウトさせて数箇所〜数十箇所マイクロメータ等で実測するか、軟Ｘ線等による非破壊計測装置でオフライン検査を行なう。Ｘ線による非破壊計測装置の例として特開平９−２１０６６２号公報等がある。巻締め不良出現結果としての舌出し缶検査法としては特開平６−３３１５６７号公報や特開平７−２１８４５３号公報に見られるが、何れも缶胴と缶蓋や缶底を巻締めた場合の缶胴フランジ一部変形やはみ出し部分の変化を見い出す方法である。一方ビン等のラベル外観検査のための特開平６−１８６００２号公報では、検査対象製品本体が照明光を透過しラベルがシャドウ映像になる事を利用した透過照明法を基盤としているが缶巻締め厚さ計測検査では被検体缶が光を透過しないため缶巻締め厚さを計測出来ない。
【０００４】
図７に従来の照明及び撮像例を示す。図７では、缶１０に対して、上方に撮像装置５ａと照明装置３ｃとを設け、右側方に撮像装置５ｂ、左側方に照明装置３ｄを設けた。被検体缶１０の上方に配置された照明装置３ｃと撮像装置５ａによって図８に示す上方入力映像１１を得るがシーミングパネルの反射映像は鮮明に捕えられるもののシーミングパネル・ラジアスとチャックウォールの境が判別出来ずシーミングウォールも不鮮明でシーミングウォールの最も膨らんだ部分とチャックウォール面の傾きと平行に立ち上がった間の寸法を計測出来ない。また図７の被検体缶１０の側方に配置された照明装置３ｄとそれに対向して配置された撮像装置５ｂによって図９に示す側方入力映像１２であるシーミングウォールのシャドウ映像を得られるがチャックウォールが全く見えずこの映像からもシーミングウォールの最も膨らんだ部分とチャックウォール面の傾きと平行に立ち上がった部分との間の寸法を計測出来ない。
【０００５】
【発明が解決しようとする課題】
従来の検査では缶巻締め厚さが予め決められた一定の管理範囲に有ることを、一定時間毎にオフラインで行うしか方法が無く、管理範囲外の缶を検出してから再調整までにかなりの時間差を生じてしまい不良缶の生産数を増加させてしまう恐れがあり、生産ライン中での缶巻締め厚さ計測装置提供が望まれている。一方ビン等のラベル外観検査の様に検査対象製品本体が照明光を透過しないためシャドウ映像だけでは計測出来ないことから新たな照明や画像処理方法が必要となった。
【０００６】
本発明の目的は、缶巻き締め良否を、搬送路上で迅速に自動判定可能にする選別装置を提供する。
【０００７】
【課題を解決するための手段】
本発明は、搬送中の缶の巻き締め厚さを検出し選別する缶巻締め選別装置において、
缶が所定位置に来たことを検出するセンサと、
この所定位置にある缶の巻締め部分に対して、斜め上方から光を照射する第１の照明装置と、
この所定位置にある缶の巻締め部分に対して、上記斜め上方に隣接し且つ巻締め部分の側方から光を照射する第２の照明装置と、
この側方への対向側方に設置され、光の照射された巻締め部分を含む缶の部位を撮像する撮像装置と、
上記センサの缶検出信号をもとに撮像装置に撮像させる指令手段と、
この撮像した映像を取込み、多階調濃淡画像を得る手段と、
この多階調濃淡画像中に、シーミングウォール外端位置検出用の第１の処理領域、チャックウォール内端位置検出用の第２の処理領域を設定する手段と、
第１、第２の処理領域に関して所定の一軸方向に投影し、第１、第２の投影信号を得る手段と、
第１の投影信号からシーミングウォール外端位置を求め、第２の投影信号からチャックウォールの内端位置を求め、シーミングウォール外端位置とチャックウォール内端位置との距離差に基づき、巻締め厚さを算出する手段と、
この巻締め厚さが基準値内であれば正常巻締めと判定し、基準値外であれば巻締め不良と判定して、缶の選別を行う手段と、
を備えた缶巻き締め選別装置を開示する。
【０００８】
更に本発明は、上記第１、第２の照明装置に代わり、面状照出面を持ち、缶巻き締め部分の斜め上方及び側方に同時に面状光を照射する面照明装置を設けた缶巻締め選別装置を開示する。
【０００９】
更に本発明は、上記第１、第２の照明装置に代わり、面状照出面を持ち、缶巻き締め部分の斜め上方及び側方に同時に面状光を照射する面照明装置を使用するものとし、且つ撮像装置と面照明装置とを対にして、缶巻締め部分に対してその周囲に複数対配置するものとした缶巻締め選別装置を開示する。
【００１１】
【発明の実施の形態】
以下本発明の実施例を図１〜図３により説明する。
図１は、本発明の缶巻締め厚さ計測検査装置の全体構成を表す図である。図１で、缶１０は、ベルトコンベア等の搬送装置１上を移動する。所定位置に缶がきたことを検出するセンサ４を設けておき、このセンサ４の検出信号をトリガーとして撮像を行う。撮像手段として、１台の撮像装置５を設け、そのための照明装置３ａと３ｂとを別位置に設置した。照明装置３ａは、斜め上方に設置し、照明装置３ｂは、撮像装置５に対向する側方に設置した。画像処理装置６は、撮像装置５の映像を取り込み画像処理、及び判定処理を行う。搬送中の被検体缶１０を、センサ４が所定位置で検出する。これを受けて撮像装置５は、照明装置３ａからの光照射によって得られる被検体缶１０の巻締め部側面一方側の斜め上の映像と、照明装置３ｂからの光照射によって得られる映像と、を含む１つの映像を撮像する。その映像例を図２に示す。この映像は画像処理装置６に入力される。尚、図２の映像の中で、点々を施した部分は、本来映像として暗い部分であり、
わかりやすくするために点々化したものである。図３（ａ）、図８、図９でも同様に、暗い部位を点々化してある。
【００１２】
画像処理装置６は、図２の入力映像をＡ／Ｄ変換して多階調濃淡画像として入力する映像入力部６０１と、２つの処理領域Ｅ_１とＥ_２から濃淡投影分布を抽出する濃淡投影分布処理部６０２と、２つの濃淡投影分布から缶巻締め厚さを計測する缶巻締め厚さ計測部６０３と、２つの濃淡投影分布から缶巻締め厚さを計測する条件を予め設定して置く計測条件設定部６０４と、缶巻締め厚さ計測部での測定値に対して上限及び下限を記憶させて置く比較データ記憶部６０５と、測定値を比較データにより判定する判定部６０６と、判定が良品の場合に測定値を出力する良品測定値出力部６０７と、判定が不良の場合に信号を出力する不良信号出力部６０８、から構成されている。
【００１３】
図２の映像は図６の缶巻締め厚さ断面と各部名称に示す通り、照明装置３ａによってシーミングパネル・ラジアス及びシーミングパネルの反射映像とチャックウォールのシャドウ映像と、照明装置３ｂによってシーミングウォール・ラジアス及びシーミングウォールのシャドウ映像とを含む１画面で映像している。設定された図２の処理領域Ｅ_１とＥ_２について、図３に示す計測処理を画像処理装置６で行う。
【００１４】
映像入力部６０１は映像を取り込み、濃淡投影分布処理部６０２は図２の缶巻締め厚さ計測のための処理領域Ｅ_１及びＥ_２を設定（図３（ａ））しそれぞれの処理領域毎に垂直方向に投影し図３（ｂ）の分布を得る。計測条件設定部６０５は、缶巻締め厚さＴの算出に利用するパラメータｈ_１、ｈ_２、厚さＴの算出式それに使うｔの算出式を設定する。缶巻締め厚さ計測部６０３は、設定されたパラメータｈ_１を利用して、処理領域Ｅ_１でシーミングウォール最大値となるシーミングウォール最左辺値の位置（外端位置）ｔ_１を計測し、更にパラメータｈ_２を利用して、同処理領域２でチャックウォールとシーミングパネル・ラジアスの境界最大値となるチャックウォール最左辺位置（内端位置）ｔ_２を計測し、ｔ_１とｔ_２から缶巻締め厚さＴを得る。
【００１５】
ここで、パラメータｈ_１、ｈ_２、Ｔ、ｔ及びそれに関係する値は以下の通りである。
【数１】

【００１６】
缶巻締め厚さＴの算出の具体的な手順は以下となる。
（１）、映像の中に、図３（ａ）の如く処理領域Ｅ、及びＥ_２を設定する。
（２）、処理領域Ｅ_１、Ｅ_２についてそれぞれ投影信号を得る。この投影信号を図３（ｂ）に示す。
（３）、処理領域Ｅ_１の白色濃度値信号Ｈ_１を抽出する。Ｈ_１とαとを用いて、シーミングウォール最左辺判定濃度値ｈ_１を求める。図３（ｂ）参照。
【数２】

（４）、白色濃度値信号Ｈ_１につながり且つ最初にｈ_１となる時の位置を、ｔ_１として求める。このｔ_１がシーミグウォール最左辺位置となる。
（５）、同様に、処理領域Ｅ_２について、Ｈ_２、ｈ_２を求める。ｈ_２は、Ｈ_２につながる最後のｈ_２である。図３（ｂ）では最後のｈ_２の前に２つのｈ_２が存在している。
【数３】

この最後のｈ_２となる位置がチャックウォール最左辺位置ｔ_２である。
（６）、位置ｔ_１とｔ_２の差分の絶対値ｔが、缶巻締め厚さに相当するが、チャックウォール自体が傾いていることからこれを、係数θを与えて補正し、正規の缶巻締め厚さＴを求める。この様子は図３（ｃ）に示す。
【数４】

【００１７】
判定部６０６は、上記算出した厚さＴが比較データ記憶部６０５に予め設定された上限値Ｔ_１と下限値Ｔ_２の範囲内に有るか否かを比較判定する。その範囲内の場合は測定値を良品測定値出力部６０７に、範囲外の場合は不良信号出力部６０８に送る。出力部６０８からは外部に不良信号を出力し、選別する。
【００１８】
尚、領域Ｅ_１、Ｅ_２の設定のために、撮像時の缶位置変動に対処するため事前にその変動量を計測しておく。そして計測目的とするそれぞれの最左辺ポイントが吸収（領域内に存在すること）出来るだけの大きさと位置に領域Ｅ_１、Ｅ_２を設定する。αやβのパラメータや座標斜め係数θは、締め厚さをマイクロメータ等で実測する場合シーミングウォールとチャックウォールを挟んで測定するのに対して、画像処理ではシーミングウォール最左辺値とチャックウォールのシーミングパネル・ラジアス境界値間を計測しているのと、チャックウォールが缶胴に対してわずかに外側へ傾くためそのまま計測すると実測値と画像計測値に誤差を生じてしまうため傾きに合わせた計測関数設定及びシーミング装置のチャック形状に合わせた一定の補正値を画像処理装置６の計測条件設定部６０４に持たせることで解決している。
【００１９】
以上の実施例での、撮像から良否判定までの総処理時間は、数１０ｍｓｅｃであった。例えば搬送ラインスピードが１００ｍ／分の場合、総処理時間が３０ｍｓｅｃの時、この間の缶移動距離は６０ｍｍ程度となり、搬送ラインを停止させることなく、連続的に選別可能であった。
【００２０】
図４は他の実施の態様を示す。図で図１の照明装置３ａ及び３ｂを、面射出部３０を持つ面照明装置３に代え、缶巻締め部側面がシャドウに、シーミングパネル・ラジアス及びシーミングパネルは反射して光り、チャックウォールがシャドウになる様面照明装置３を配置し、照明点灯装置２によりセンサ４の検知信号に同期したストロボなどの瞬間照明にする事で缶巻締め部の外側面及び内側面の映像を高速且つ安定して得られる様にし、更にエアノズルや回転ブラシによる選別装置８とビデオモニタなどの結果表示装置７を付加した缶巻締め厚さ計測検査装置としている。
【００２１】
また、図４の面照明装置３と対向して配置された撮像装置５を１組として図５の様に複数組配置し、画像処理装置６の映像入力部を同じく複数チャンネル設ける事により被検体缶１缶当りの缶巻締め厚さを複数箇所計測出来る缶巻締め厚さ計測検査装置としている。尚、光干渉防止のために、各面射出部３０の全面には、光干渉防止溶偏向フィルタ３１を設けた。即ち複数組の映像を同時に画像処理装置６の映像入力部６０１に入力する場合は、対向する照明装置の光りが同じく対向する撮像装置に直接入らない様面照明装置及び撮像装置レンズに偏光フィルタ３等を付加して照明照射方向やレンズ入射方向を制限して互いに干渉しないよう配置する。
【００２２】
【発明の効果】
本発明によれば、缶巻締め全周に関わる不良の生産ライン中の検出選別や比較データ記憶部に予め設定された範囲に対する近似警報が可能である。
【図面の簡単な説明】
【図１】本発明の全体構成を示す図である。
【図２】撮像装置入力映像及び処理を示す図である。
【図３】計測処理示す図である。
【図４】実運用全体構成を示す図である。
【図５】測定箇所を複数にする照明及び撮像装置構成を示す図である。
【図６】缶巻締め厚さ断面と各部名称を示す図である。
【図７】従来照明及び撮像方法を示す図である。
【図８】従来照明及び撮像方法による上方入力映像を示す図である。
【図９】従来照明及び撮像方法による側方入力映像を示す図である。
【符号の説明】
１搬送装置
２照明点灯装置
３面照明装置
３ａ照明装置
３ｂ照明装置
３ｃ照明装置
３ｄ照明装置
４センサ
５撮像装置
５ａ撮像装置
５ｂ撮像装置
６画像処理装置
６０１映像入力部
６０２濃淡投影分布処理部
６０３缶巻締め厚さ計測部
６０４計測条件設定部
６０５比較データ記憶部
６０６判定部
６０７良品測定値出力部
６０８不良信号出力部
７結果表示装置
８選別装置
１０被検体缶[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a detection device for detecting a tightening defect related to the entire circumference of a tightening generated after a can cover is tightened in a production line and for monitoring and selecting a tightening state.
[0002]
[Prior art]
The tightening condition of the can lid and the bottom of the can formed by the seaming device is greatly related to the quality of the can itself and, consequently, the quality of the product stored in the can, and depends on the adjustment of the seamer head. Measurement and inspection of the can winding thickness is essential. As shown in FIG. 6 showing the cross section of the can winding thickness and the name of each part, the can winding thickness T is a seaming wall, a seaming wall radius, a seaming panel, a seaming wall obtained by winding a can lid or a can bottom. It is the width of the trapezoidal portion of the mining panel radius, and refers to the dimension between the most bulged portion of the seaming wall and the portion that rises parallel to the inclination of the chuck wall surface.
[0003]
Generally, for inspection of the tightening state, several minutes of the seamer head of the seaming device are lined out from the production line at regular intervals and measured at several places to several tens places using a micrometer or by soft X-rays. Perform an offline inspection with a non-destructive measuring device. Japanese Patent Application Laid-Open No. 9-210662 discloses an example of a non-destructive measurement apparatus using X-rays. As a method of inspecting a tongue sticking can as a result of the appearance of poor tightening, it can be found in JP-A-6-331567 and JP-A-7-218453. This is a method of finding a partial deformation of the can body flange and a change in the protruding part. On the other hand, JP-A-6-186002 for inspecting the appearance of labels on bottles and the like is based on a transmission illumination method utilizing the fact that the product to be inspected transmits illumination light and the label becomes a shadow image. In the thickness measurement inspection, since the subject can does not transmit light, the can-tightening thickness cannot be measured.
[0004]
FIG. 7 shows a conventional illumination and imaging example. In FIG. 7, an imaging device 5a and an illumination device 3c are provided above the can 10, an imaging device 5b is provided on the right side, and an illumination device 3d is provided on the left side. The upper input image 11 shown in FIG. 8 is obtained by the illuminating device 3c and the imaging device 5a disposed above the subject can 10, but the reflected image of the seaming panel is clearly captured, but the seaming panel radius and the chuck wall are used. Since the boundary cannot be determined, the seaming wall is also unclear, and the dimension between the most bulged portion of the seaming wall and the inclination of the chuck wall surface cannot be measured. Further, the shadow image of the seaming wall, which is the side input image 12 shown in FIG. 9, can be obtained by the illumination device 3d arranged on the side of the subject can 10 in FIG. 7 and the imaging device 5b arranged opposite to the illumination device 3d. However, the chuck wall is not visible at all, and from this image, it is impossible to measure the dimension between the most bulged portion of the seaming wall and the portion rising in parallel with the inclination of the chuck wall surface.
[0005]
[Problems to be solved by the invention]
In conventional inspections, the only way to make sure that the can winding thickness is within the predetermined fixed control range is to perform offline at regular intervals, and it is quite necessary to detect cans outside the control range and then readjust. Therefore, there is a possibility that the production time of the defective cans may be increased and the number of defective cans to be produced may be increased. Therefore, it is desired to provide a measuring apparatus for measuring the thickness of can-can-tightening in a production line. On the other hand, since the product to be inspected does not transmit illumination light as in the case of label appearance inspection of bottles or the like, it cannot be measured only by a shadow image, so a new illumination and image processing method is required.
[0006]
SUMMARY OF THE INVENTION An object of the present invention is to provide a sorting apparatus which can quickly and automatically determine whether or not can winding is good on a conveyance path.
[0007]
[Means for Solving the Problems]
The present invention is a can-sealing sorting device that detects and sorts the thickness of a can-carrying can during transport,
A sensor for detecting that the can has come to a predetermined position;
A first illuminating device for irradiating light from obliquely above to the tightened portion of the can at the predetermined position;
A second lighting device that is adjacent to the obliquely upward direction and irradiates light from a side of the tightened portion with respect to the tightened portion of the can at the predetermined position;
An imaging device that is installed on the side opposite to this side and images a portion of the can including the tightened portion irradiated with light,
Command means for causing the imaging device to image based on the can detection signal of the sensor,
Means for capturing the captured video and obtaining a multi-tone image,
Means for setting a first processing area for detecting the outer edge position of the seaming wall and a second processing area for detecting the inner edge position of the chuck wall in the multi-tone image;
Means for projecting the first and second processing areas in a predetermined uniaxial direction to obtain first and second projection signals;
The outer end position of the seaming wall is obtained from the first projection signal, the inner end position of the chuck wall is obtained from the second projection signal, and the winding is performed based on the distance difference between the outer end position of the seaming wall and the inner end position of the chuck wall. Means for calculating the fastening thickness;
If the thickness of the tightening is within the reference value, it is determined that the winding is normal.If the thickness is outside the reference value, it is determined that the tightening is inferior.
Disclosed is a can-winding sorting device provided with:
[0008]
Further, the present invention provides a can winding device having a planar lighting device having a planar illuminating surface instead of the first and second lighting devices, and irradiating planar light obliquely above and to the side of the can winding portion at the same time. A closing sorter is disclosed.
[0009]
Further, in the present invention, instead of the first and second lighting devices, a surface lighting device having a planar illuminating surface and simultaneously irradiating the planar light obliquely above and to the side of the can-tightened portion is used. Also disclosed is a can-winding sorting device in which a plurality of imaging devices and surface illumination devices are arranged in pairs around a can-winding portion.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to FIGS.
FIG. 1 is a diagram illustrating an overall configuration of a can winding thickness measurement and inspection device according to the present invention. In FIG. 1, a can 10 moves on a conveyor 1 such as a belt conveyor. A sensor 4 for detecting that a can has come to a predetermined position is provided, and imaging is performed using a detection signal of the sensor 4 as a trigger. One imaging device 5 was provided as imaging means, and the lighting devices 3a and 3b for that purpose were installed at different positions. The lighting device 3a was installed diagonally upward, and the lighting device 3b was installed on the side facing the imaging device 5. The image processing device 6 captures a video of the imaging device 5 and performs image processing and determination processing. The sensor 4 detects the subject can 10 being transported at a predetermined position. In response to this, the imaging device 5 generates an image obtained by irradiating the light from the illumination device 3a with an obliquely upper image on one side of the side surface of the tightening portion of the subject can 10, and an image obtained by applying the light from the illumination device 3b Is captured. FIG. 2 shows an example of the image. This video is input to the image processing device 6. Note that, in the image of FIG. 2, the dotted portion is originally a dark portion as an image,
It is dotted for clarity. Similarly, in FIG. 3A, FIG. 8, and FIG. 9, dark portions are dotted.
[0012]
The image processing device 6 performs an A / D conversion of the input image of FIG. 2 and inputs the image as a multi-tone image, and a gray-scale projection for extracting a gray-scale projection distribution from the two processing areas E ₁ and E _2. The distribution processing unit 602, the can-tightening thickness measuring unit 603 for measuring the can-tightening thickness from the two gray-scale projection distributions, and the conditions for measuring the can-tightening thickness from the two gray-scale projection distributions are set in advance. A measurement condition setting unit 604 to be placed, a comparison data storage unit 605 that stores an upper limit and a lower limit with respect to the measurement value in the can winding thickness measurement unit, a determination unit 606 that determines the measurement value by the comparison data, It comprises a non-defective measured value output unit 607 for outputting a measured value when the judgment is good, and a bad signal output unit 608 for outputting a signal when the judgment is bad.
[0013]
The image of FIG. 2 is a reflection image of the seaming panel / radius and the seaming panel, a shadow image of the chuck wall, and a scene image of the illumination device 3b, as shown in FIG. The image is displayed on one screen including a shadow image of a mining wall radius and a seaming wall. The processing area E ₁ and E ₂ of the set 2, performs measurement processing shown in FIG. 3 by the image processing device 6.
[0014]
Video input unit 601 captures the image, gray projection distribution processing unit 602 sets a processing area E ₁ and E ₂ for a can-seamed thickness measurement of FIG. 2 (FIG. 3 (a)) to the respective processing each area To the vertical direction to obtain the distribution shown in FIG. The measurement condition setting unit 605 sets parameters h ₁ and h ₂ used for calculating the can winding thickness T, a calculation formula for the thickness T, and a calculation formula for t used therefor. Kanmaki clamping thickness measuring unit 603, measured using the parameter h ₁ which is set, the position of the seaming wall uppermost left value as the seaming wall maximum at the processing area E ₁ (outer end position) t ₁ and further by using the parameter h _2, the chuck wall most left position where the boundary maximum values of the chuck wall and seaming panel radius in the same processing area 2 (the inner end position) t ₂ was measured, t ₁ and t _{From 2} , the can winding thickness T is obtained.
[0015]
Here, the parameters h ₁ , h ₂ , T, t and their related values are as follows.
(Equation 1)

[0016]
A specific procedure for calculating the can winding thickness T is as follows.
(1), set in the image, as the processing area E in FIG. 3 (a), and _{E 2.}
(2) A projection signal is obtained for each of the processing regions E ₁ and E ₂ . This projection signal is shown in FIG.
(3) extracts the white density value signal _{H 1} process area _{E 1.} With the H ₁ and alpha, determining the seaming wall top left determination density value h _1. See FIG. 3 (b).
(Equation 2)

(4), the position when and lead to white density value signal _{H 1} first becomes _{h 1,} calculated as _{t 1.} The t ₁ is the Sea MiG-wall top left-hand side position.
(5) Similarly, H ₂ and h ₂ are obtained for the processing area E ₂ . h ₂ is the last of _{h 2} that leads to _{H 2.} Figure 3 (b) in two _{h 2} prior to the last _{h 2} is present.
(Equation 3)

This last h ₂ a position is the chuck wall most left position t _2.
(6), the absolute value t of the difference between the position t ₁ and t ₂ are, but corresponds to Kanmaki fastening thickness, it from the chuck wall itself is tilted, correct giving coefficients theta, regular Obtain the can winding thickness T. This state is shown in FIG.
(Equation 4)

[0017]
Judging unit 606 judges compares whether there within thickness T calculated above is comparison data storing section 605 in the preset upper limit T ₁ and the lower limit value T _2. If it is within the range, the measured value is sent to the non-defective measured value output unit 607, and if it is out of the range, it is sent to the bad signal output unit 608. The output unit 608 outputs a failure signal to the outside, and performs selection.
[0018]
Note that, in order to set the regions E ₁ and E ₂ , the amount of the fluctuation is measured in advance to cope with the fluctuation of the can position at the time of imaging. Then, the areas E ₁ and E ₂ are set to have the size and the position where the leftmost points of the measurement purpose can be absorbed (exist in the area). The parameters α and β and the coordinate oblique coefficient θ are measured with the seaming wall and chuck wall sandwiched when the tightening thickness is actually measured with a micrometer or the like. The measurement between the seam panel and the radius boundary value of the wall and the chuck wall tilted slightly outward with respect to the can body. The problem is solved by providing the measurement condition setting unit 604 of the image processing apparatus 6 with the measurement function setting that is adjusted and a fixed correction value that matches the chuck shape of the seaming device.
[0019]
In the above embodiment, the total processing time from imaging to pass / fail determination was several tens of msec. For example, when the transfer line speed is 100 m / min, when the total processing time is 30 msec, the moving distance of the can during this period is about 60 mm, so that continuous sorting can be performed without stopping the transfer line.
[0020]
FIG. 4 shows another embodiment. In the drawing, the lighting devices 3a and 3b of FIG. 1 are replaced with a surface lighting device 3 having a surface emitting portion 30, the side of the can-winding portion becomes a shadow, the seaming panel / radius and the seaming panel reflect and shine. The surface illumination device 3 is arranged so that the wall becomes a shadow, and the illumination lighting device 2 instantaneously illuminates a strobe or the like synchronized with the detection signal of the sensor 4 so that images on the outer surface and the inner surface of the can winding portion can be quickly displayed. In addition, a can winding thickness measurement / inspection device is provided in which a selection device 8 using an air nozzle or a rotating brush and a result display device 7 such as a video monitor are added.
[0021]
Further, as shown in FIG. 5, a plurality of sets of the imaging devices 5 arranged opposite to the surface illumination device 3 of FIG. 4 are arranged as shown in FIG. The apparatus is a can winding thickness measuring and inspecting apparatus capable of measuring the can winding thickness per can at a plurality of locations. In order to prevent light interference, an optical interference prevention / deflection filter 31 is provided on the entire surface of each surface emitting section 30. That is, when simultaneously inputting a plurality of sets of images to the image input unit 601 of the image processing apparatus 6, the polarizing filter 3 is attached to the surface illumination device and the imaging device lens so that the light of the opposing illumination device does not directly enter the imaging device of the opposition. By limiting the direction of illumination and the direction of incidence of the lens by adding the above, they are arranged so as not to interfere with each other.
[0022]
【The invention's effect】
Advantageous Effects of Invention According to the present invention, it is possible to detect and sort out a defect in a production line related to the entire circumference of can winding and to perform an approximate alarm for a range preset in a comparison data storage unit.
[Brief description of the drawings]
FIG. 1 is a diagram showing an overall configuration of the present invention.
FIG. 2 is a diagram showing an input image and processing of an imaging device.
FIG. 3 is a diagram showing a measurement process.
FIG. 4 is a diagram showing the overall configuration of actual operation.
FIG. 5 is a diagram illustrating a configuration of an illumination and imaging device in which a plurality of measurement points are provided.
FIG. 6 is a diagram showing a cross section of a can winding thickness and names of respective parts.
FIG. 7 is a diagram showing a conventional illumination and imaging method.
FIG. 8 is a diagram showing an upper input image by a conventional illumination and imaging method.
FIG. 9 is a diagram showing a side input image by a conventional illumination and imaging method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Conveying device 2 Illumination lighting device 3 Surface illumination device 3a Illumination device 3b Illumination device 3c Illumination device 3d Illumination device 4 Sensor 5 Imaging device 5a Imaging device 5b Imaging device 6 Image processing device 601 Video input unit 602 Gray scale projection distribution processing unit 603 Can Winding thickness measurement unit 604 Measurement condition setting unit 605 Comparison data storage unit 606 Judgment unit 607 Non-defective measurement value output unit 608 Failure signal output unit 7 Result display device 8 Sorting device 10 Subject can

Claims

In a can winding sorter that detects and sorts the winding thickness of cans being transported,
A sensor for detecting that the can has come to a predetermined position;
A first illuminating device for irradiating light from obliquely above to the tightened portion of the can at the predetermined position;
A second lighting device that is adjacent to the obliquely upward direction and irradiates light from a side of the tightened portion with respect to the tightened portion of the can at the predetermined position;
An imaging device that is installed on the side opposite to this side and images a portion of the can including the tightened portion irradiated with light,
Command means for causing the imaging device to image based on the can detection signal of the sensor,
Means for capturing the captured video and obtaining a multi-tone image,
Means for setting a first processing area for detecting the outer edge position of the seaming wall and a second processing area for detecting the inner edge position of the chuck wall in the multi-tone image;
Means for projecting the first and second processing areas in a predetermined uniaxial direction to obtain first and second projection signals;
The outer end position of the seaming wall is obtained from the first projection signal, the inner end position of the chuck wall is obtained from the second projection signal, and the winding is performed based on the distance difference between the outer end position of the seaming wall and the inner end position of the chuck wall. Means for calculating the fastening thickness;
If the thickness of the tightening is within the reference value, it is determined that the winding is normal.If the thickness is outside the reference value, it is determined that the tightening is inferior.
A can-winding sorting device equipped with a.

2. The can winding device according to claim 1, further comprising a surface lighting device having a planar illuminating surface and simultaneously irradiating a planar light obliquely above and to a side of the can winding portion, instead of the first and second lighting devices. Sorting device.

Instead of the first and second lighting devices, a surface lighting device having a planar illuminating surface and simultaneously irradiating planar light obliquely above and to the side of the can-tightened portion shall be used. 2. The can-winding sorting device according to claim 1, wherein a plurality of pairs are arranged around the can-winding portion with the surface lighting device.