JP7037173B2 - Quality inspection equipment for corrugated cardboard sheets - Google Patents

Quality inspection equipment for corrugated cardboard sheets Download PDF

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JP7037173B2
JP7037173B2 JP2018024186A JP2018024186A JP7037173B2 JP 7037173 B2 JP7037173 B2 JP 7037173B2 JP 2018024186 A JP2018024186 A JP 2018024186A JP 2018024186 A JP2018024186 A JP 2018024186A JP 7037173 B2 JP7037173 B2 JP 7037173B2
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淳人 玉田
優 萬木
正人 金川
宏巳 岡本
好孝 氷上
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Dac Engineering Co Ltd
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本発明は、段ボールシートの品質検査装置に関する。 The present invention relates to a quality inspection device for corrugated cardboard sheets.

段ボールシートの印刷は、たとえば特許文献１に記載のようなフレキソ印刷機で行われる。また、インキの色の管理方法としては、たとえば特許文献２に記載のように、フレキソ印刷機に似た校正装置を用いて色を測定し、色の管理を行うことが提案されている。 Printing of the corrugated cardboard sheet is performed by, for example, a flexographic printing machine as described in Patent Document 1. Further, as a method for controlling the color of ink, as described in Patent Document 2, for example, it has been proposed to measure the color using a calibration device similar to a flexographic printing machine and manage the color.

ところで、段ボールシートの場合、インキの色は、塗膜厚（インキ量）の影響を受ける。すなわち、塗膜厚が薄いと下地の色の影響が出てしまい、求められる色が出ないという問題がある。インキの塗膜厚は、インキの転移量（盛り量）やシートの性状、インキの粘度等により変動し、インキの転移量もインキの粘度や印刷機の各種条件で変動する。また、インキの粘度も水性インキの水の気化などで随時変動してしまう。シートの性状も一定ではなく、ロットが変われば大きく変動する。 By the way, in the case of a corrugated cardboard sheet, the color of the ink is affected by the coating thickness (ink amount). That is, if the coating thickness is thin, the color of the background is affected, and there is a problem that the required color cannot be obtained. The coating thickness of the ink varies depending on the transfer amount (filling amount) of the ink, the properties of the sheet, the viscosity of the ink, and the like, and the transfer amount of the ink also varies depending on the viscosity of the ink and various conditions of the printing machine. In addition, the viscosity of the ink also fluctuates at any time due to the vaporization of water in the water-based ink. The properties of the sheet are not constant, and will fluctuate greatly if the lot changes.

したがって、印刷中、インキの塗膜厚は常に大きく変動してしまい、色の管理は容易ではない。実際には、印刷中、定期的に抜き取った印刷物の状態を見本と見比べ、必要に応じて印刷装置（転移量）を調整したり、インキに水を足したりすることが行われているのが現状である。 Therefore, during printing, the coating thickness of the ink always fluctuates greatly, and it is not easy to control the color. In reality, during printing, the state of the printed matter that has been extracted regularly is compared with the sample, and the printing device (transfer amount) is adjusted or water is added to the ink as necessary. The current situation.

特開平１０－１５７０７９号公報Japanese Unexamined Patent Publication No. 10-157079 特表２０１４－５０９２７９号公報Japanese Patent Publication No. 2014-509279

そこで、本発明が前述の状況に鑑み、解決しようとするところは、印刷中にインキの塗膜厚の変動を把握でき、これにより印刷が不良になる前に、転移量や粘性を調整して塗膜厚を調整可能とする技術を提供する点にある。 Therefore, what the present invention seeks to solve in view of the above-mentioned situation is that the fluctuation of the ink coating thickness can be grasped during printing, and the transfer amount and viscosity are adjusted before the printing becomes defective. The point is to provide a technique for adjusting the coating thickness.

本発明者は、かかる現況に鑑み、検討した結果、段ボールシートの印刷面のインキの色を検出することで、インキ塗膜厚の良否を推測できることを着想し、印刷中のオンラインにおいて特許文献１のような専用の分光計を用いることはできないことから、さらに鋭意検討をすすめた結果、印刷されたインキの濃度情報を用いることで、簡易に塗膜厚の良否も判定でき、そうであるならば、従来から印刷品質や見当合わせのために用いられている検査装置の撮像カメラを流用する等して、通常の撮像カメラでオンラインで濃度情報を得ることができることを見出し、本発明を完成するに至った。 The present inventor has conceived that the quality of the ink coating thickness can be estimated by detecting the color of the ink on the printed surface of the cardboard sheet as a result of the examination in view of the current situation, and Patent Document 1 is available online during printing. Since it is not possible to use a dedicated spectrometer such as the one shown above, as a result of further diligent studies, it is possible to easily determine whether the coating thickness is good or bad by using the density information of the printed ink. For example, it has been found that density information can be obtained online with a normal image pickup camera by diverting the image pickup camera of an inspection device conventionally used for print quality and registration, and the present invention is completed. It came to.

すなわち本発明は、以下の発明を包含する。
（１） 段ボールシートの印刷面を撮像する撮像手段と、前記撮像手段による撮像面を照明する照明手段と、前記撮像手段で得られる画像情報のＲＧＢレベルから印刷濃度情報を取得する濃度情報取得手段と、前記濃度情報取得手段により取得された印刷濃度情報に基づき、前記印刷面のインキ量の良否を判定する判定手段とを備えることを特徴とする、段ボールシートの品質検査装置。 That is, the present invention includes the following inventions.
(1) An image pickup means for imaging the printed surface of a corrugated cardboard sheet, a lighting means for illuminating the image pickup surface by the image pickup means, and a density information acquisition means for acquiring print density information from the RGB level of the image information obtained by the image pickup means. A corrugated cardboard sheet quality inspection apparatus comprising the means for determining whether or not the amount of ink on the printed surface is good or bad based on the print density information acquired by the density information acquisition means.

（２） 前記判定手段が、あらかじめ記憶されている良品の印刷濃度情報を基準濃度とし、該基準濃度との比較によりインキ量の良否を判定する（１）記載の段ボールシートの品質検査装置。 (2) The corrugated cardboard sheet quality inspection apparatus according to (1), wherein the determination means uses pre-stored print density information of a non-defective product as a reference density and determines the quality of the ink amount by comparison with the reference density.

（３） 前記濃度情報取得手段が、シート下地のＲＧＢレベル、および前記画像情報のＲＧＢレベルに基づき、シート下地の色で補正された印刷濃度情報を算出する（１）又は（２）記載の段ボールシートの品質検査装置。 (3) The corrugated cardboard according to (1) or (2), wherein the density information acquisition means calculates print density information corrected by the color of the sheet base based on the RGB level of the sheet base and the RGB level of the image information. Sheet quality inspection equipment.

（４） 前記撮像手段が、インキが載った着色領域と、インキが載っていないシート下地領域とを撮像し、前記濃度情報取得手段が、前記撮像手段で得られた着色領域の画像情報のＲＧＢレベル、および下地領域の画像情報のＲＧＢレベルから、前記補正された印刷濃度情報を算出し、前記判定手段が、前記着色領域の前記補正された印刷濃度情報に基づき、インキ量の良否を判定する、（１）～（３）の何れかに記載の段ボールシートの品質検査装置。 (4) The image pickup means takes an image of the colored region on which the ink is placed and the sheet base area on which the ink is not placed, and the density information acquisition means RGB of the image information of the colored region obtained by the image pickup means. The corrected print density information is calculated from the level and the RGB level of the image information of the background region, and the determination means determines the quality of the ink amount based on the corrected print density information of the colored region. , (1) to (3). The quality inspection device for the corrugated sheet according to any one of (1) to (3).

（５） 前記濃度情報取得手段が、下記（式１）に基づき算出される濃度を、前記補正された印刷濃度情報としてなる（３）又は（４）記載の段ボールシートの品質検査装置。 (5) The corrugated cardboard sheet quality inspection apparatus according to (3) or (4), wherein the density information acquisition means uses the density calculated based on the following (Equation 1) as the corrected print density information.

（６） 前記撮像手段で得られる画像情報のＲＧＢレベルに基づき、デバイス・インディペンデント・カラーで表現されたインキ色情報を取得するインキ色情報取得手段を設けた、（１）～（５）の何れかに記載の段ボールシートの品質検査装置。 (6) Ink color information acquisition means for acquiring ink color information expressed in device independent color based on the RGB level of the image information obtained by the image pickup means is provided (1) to (5). The quality inspection device for the corrugated sheet described in any of the above.

（７） 前記判定手段が、インキ量の必要な調整量を算出し、該調整量に基づき、印刷装置のインキ量調整機構に送信する制御信号を生成する制御信号生成手段を設けた、（１）～（６）の何れかに記載の段ボールシートの品質検査装置。 (7) The determination means is provided with a control signal generation means for calculating a required adjustment amount of the ink amount and generating a control signal to be transmitted to the ink amount adjustment mechanism of the printing apparatus based on the adjustment amount (1). )-(6). The quality inspection device for the corrugated sheet according to any one of (6).

（８） 前記撮像手段が、段ボールシートの見当合せのための画像取得手段を兼ねている、（１）～（７）の何れかに記載の、段ボールシートの品質検査装置。 (8) The corrugated cardboard sheet quality inspection apparatus according to any one of (1) to (7), wherein the image pickup means also serves as an image acquisition means for registering the corrugated cardboard sheet.

以上にしてなる本願発明によれば、撮像手段で得られる画像情報のＲＧＢレベルから印刷濃度情報を得、この印刷濃度情報に基づいて印刷面のインキ量（塗膜厚）の良否を判定するので、印刷中にオンラインでインキの塗膜厚の変動を把握でき、これにより印刷が不良になる前に、転移量や粘性を調整して塗膜厚を調整可能となる。また、このような撮像手段は、通常の安価な撮像カメラを用いることができ、従来から印刷品質や見当合わせのために用いられている検査装置の撮像カメラを流用することが可能であり、コスト上昇も抑えることができる。 According to the present invention as described above, the print density information is obtained from the RGB level of the image information obtained by the image pickup means, and the quality of the ink amount (coating thickness) on the printed surface is determined based on the print density information. , It is possible to grasp the fluctuation of the ink coating thickness online during printing, and thereby it is possible to adjust the coating thickness by adjusting the transfer amount and the viscosity before the printing becomes defective. Further, as such an imaging means, an ordinary inexpensive imaging camera can be used, and an imaging camera of an inspection device conventionally used for print quality and registration can be diverted, and the cost can be diverted. The rise can also be suppressed.

また、判定手段が、あらかじめ記憶されている良品の印刷濃度情報を基準濃度とし、該基準濃度との比較によりインキ量の良否を判定するものでは、相対比較により、より正確にインキ量の良否を判定できる。 Further, when the determination means uses the print density information of a non-defective product stored in advance as a reference density and determines the quality of the ink amount by comparison with the reference density, the quality of the ink amount is more accurately determined by relative comparison. It can be judged.

また、濃度情報取得手段が、シート下地のＲＧＢレベル、および前記画像情報のＲＧＢレベルに基づき、シート下地の色で補正された印刷濃度情報を算出するものでは、シート性状の変動、照明手段からの照明の変動、その他環境変動による誤差を補正により無くすることができ、より正確な印刷濃度情報が得られ、インキ量の良否もより正確に判定できる。また、シート下地の色の影響を無くすることができるので、インキ本来の色情報が得られ、これによりインキの投入し間違いなども正確に判定することが可能となる。 Further, if the density information acquisition means calculates the print density information corrected by the color of the sheet base based on the RGB level of the sheet base and the RGB level of the image information, the change in the sheet properties and the lighting means. Errors due to lighting fluctuations and other environmental fluctuations can be eliminated by correction, more accurate print density information can be obtained, and the quality of the ink amount can be determined more accurately. Further, since the influence of the color of the sheet base can be eliminated, the original color information of the ink can be obtained, which makes it possible to accurately determine the ink injection error.

より具体的には、たとえば撮像手段が、インキが載った着色領域と、インキが載っていないシート下地領域とを撮像し、前記濃度情報取得手段が、前記撮像手段で得られた着色領域の画像情報のＲＧＢレベル、および下地領域の画像情報のＲＧＢレベルから、前記補正された印刷濃度情報を算出し、前記判定手段が、前記着色領域の前記補正された印刷濃度情報に基づき、インキ量の良否を判定することで実現できる。 More specifically, for example, the imaging means captures an image of the colored region on which the ink is placed and the sheet base region on which the ink is not placed, and the density information acquisition means obtains an image of the colored region obtained by the imaging means. The corrected print density information is calculated from the RGB level of the information and the RGB level of the image information of the background region, and the determination means determines whether the ink amount is good or bad based on the corrected print density information of the colored region. Can be realized by determining.

また、より具体的には、たとえば前記濃度情報取得手段が、下記（式１）に基づき算出される濃度を、前記補正された印刷濃度情報とすることで実現できる。 More specifically, for example, the density information acquisition means can realize the density by using the corrected print density information as the density calculated based on the following (Equation 1).

Figure 0007037173000001
Figure 0007037173000001

また、前記撮像手段で得られる画像情報のＲＧＢレベルに基づき、デバイス・インディペンデント・カラーで表現されたインキ色情報を取得するインキ色情報取得手段を設けたものでは、インキ情報をより詳細に得ることができ、前述のインキの投入し間違いなども正確に把握できる。 Further, in the case of providing the ink color information acquisition means for acquiring the ink color information expressed by the device independent color based on the RGB level of the image information obtained by the image pickup means, the ink information can be obtained in more detail. It can be obtained, and the above-mentioned mistakes in ink injection can be accurately grasped.

また、判定手段が、インキ量の必要な調整量を算出し、該調整量に基づき、印刷装置のインキ量調整機構に送信する制御信号を生成する制御信号生成手段を設けたものでは、印刷装置のインキ量調整機構を制御し、インキ量が常に適切になるようにフィードバック制御することができる。 Further, in the case where the determination means is provided with a control signal generation means for calculating a required adjustment amount of the ink amount and generating a control signal to be transmitted to the ink amount adjustment mechanism of the printing apparatus based on the adjustment amount, the printing apparatus is provided. It is possible to control the ink amount adjustment mechanism of the above and to control the feedback so that the ink amount is always appropriate.

また、撮像手段が、段ボールシートの見当合せのための画像取得手段を兼ねているものでは、装置の効率化が図れ、コスト上昇を大幅に抑えることができる。 Further, if the image pickup means also serves as an image acquisition means for registering the corrugated cardboard sheet, the efficiency of the apparatus can be improved and the cost increase can be significantly suppressed.

本発明の代表的実施形態にかかる品質検査装置を示す説明図。Explanatory drawing which shows the quality inspection apparatus which concerns on the typical embodiment of this invention. 同じく品質検査装置の処理装置を示すブロック図。Similarly, a block diagram showing a processing device of a quality inspection device. 同じく品質検査装置の記憶手段を示すブロック図。Similarly, a block diagram showing a storage means of a quality inspection device.

次に、本発明の実施形態を添付図面に基づき詳細に説明する。
本発明の段ボールシートの品質検査装置１は、図１に示すように、段ボールシートＷの印刷面Ｐを撮像する撮像手段２と、撮像手段２による撮像面Ｆを照明する照明手段３と、撮像手段２で得られる画像情報のＲＧＢレベルから印刷濃度情報を取得する濃度情報取得手段４１ａと、前記濃度情報取得手段により取得された印刷濃度情報に基づき、印刷面Ｐのインキ量の良否を判定する判定手段４１ｂとを備えることを特徴とする。 Next, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
As shown in FIG. 1, the corrugated cardboard sheet quality inspection device 1 of the present invention includes an image pickup means 2 for imaging the printed surface P of the corrugated cardboard sheet W, an imaging means 3 for illuminating the image pickup surface F by the image pickup means 2, and an image pickup. Based on the density information acquisition means 41a that acquires print density information from the RGB level of the image information obtained by means 2, and the print density information acquired by the density information acquisition means, the quality of the ink amount on the print surface P is determined. It is characterized by comprising a determination means 41b.

符号１１Ａ，１１Ｂ，１１Ｃは、それぞれ異なる色のインキを印刷する印刷装置を示している。印刷装置の数は限定されない。印刷装置１１Ａ，１１Ｂ，１１Ｃは、たとえばフレキソ印刷機であり、その他、オフセット印刷機やインクジェット印刷機など、種々の印刷装置に適用できる。 Reference numerals 11A, 11B, and 11C indicate printing devices that print inks of different colors. The number of printing devices is not limited. The printing devices 11A, 11B, and 11C are, for example, flexographic printing machines, and can be applied to various printing devices such as offset printing machines and inkjet printing machines.

撮像手段２は、従来の見当ずれや印刷品質検査の装置に用いられる撮像手段と同様、例えば印刷物の搬送方向１０に直交する幅方向に沿って複数の撮像カメラを設け、段ボールシートＷの全幅にわたる領域を撮像するものである。ＣＣＤやＣＭＯＳ撮像素子を搬送方向に直交する横方向に複数並設したラインセンサカメラとしてもよい。 Similar to the conventional image pickup means used for misregistration and print quality inspection devices, the image pickup means 2 is provided with a plurality of image pickup cameras along the width direction orthogonal to the transport direction 10 of the printed matter, and covers the entire width of the corrugated cardboard sheet W. The area is imaged. A line sensor camera in which a plurality of CCD or CMOS image sensors are arranged side by side in the horizontal direction orthogonal to the transport direction may be used.

カメラの数や配置は段ボールシートＷを撮像できるものであれば特に限定されず、またラインセンサカメラ以外にＣＣＤやＣＭＯＳ撮像素子を縦横方向に複数並設したエリアセンサカメラを単又は複数設けたものでもよい。照明手段は通常の検査装置に用いられる一般的な照明でよい。 The number and arrangement of the cameras are not particularly limited as long as they can image the corrugated cardboard sheet W, and in addition to the line sensor cameras, a single or multiple area sensor cameras in which a plurality of CCD or CMOS image sensors are arranged side by side in the vertical and horizontal directions are provided. But it may be. The lighting means may be general lighting used in ordinary inspection equipment.

濃度情報取得手段４１ａ及び判定手段４１ｂは、コンピュータを構成する処理装置４１に設けられている。符号４２は処理装置４１に接続された記憶手段である。処理装置４１は、マイクロプロセッサなどのＣＰＵを主体に構成され、入出力部、バスラインを通じて撮像手段２、照明手段３、記憶手段４２、および印刷装置１１Ａ～１１Ｃの調整機構１２との間でそれぞれ各種情報を送受信する。 The concentration information acquisition means 41a and the determination means 41b are provided in the processing device 41 constituting the computer. Reference numeral 42 is a storage means connected to the processing device 41. The processing device 41 is mainly composed of a CPU such as a microprocessor, and is connected to an image pickup means 2, a lighting means 3, a storage means 42, and an adjustment mechanism 12 of the printing devices 11A to 11C through an input / output unit and a bus line, respectively. Send and receive various information.

記憶手段４２は、処理装置４１内外のＲＡＭ、ＲＯＭなどの記憶メモリやハードディスク等より構成され、処理装置４１における各種処理動作の手順を規定するプログラムや処理データが記憶される。図２は本実施形態の処理装置４１の構成、図３は同じく記憶手段４２の構成を示している。 The storage means 42 is composed of storage memories such as RAMs and ROMs inside and outside the processing device 41, a hard disk, and the like, and stores programs and processing data that define procedures for various processing operations in the processing device 41. FIG. 2 shows the configuration of the processing device 41 of the present embodiment, and FIG. 3 shows the configuration of the storage means 42 as well.

処理装置４１は、図２に示すように、機能的に、濃度情報取得手段４１ａ、判定手段４１ｂ以外に、判定手段４１ｂが算出した調整量に基づき、印刷装置の調整機構を制御するための制御信号を生成する制御信号生成手段４１ｃと、見当ずれ量を算出する見当ずれ量算出処理部４１ｄとを少なくとも備えており、これら機能は上記プログラムにより実現される。 As shown in FIG. 2, the processing device 41 functionally controls the adjustment mechanism of the printing device based on the adjustment amount calculated by the determination means 41b in addition to the density information acquisition means 41a and the determination means 41b. It includes at least a control signal generation means 41c for generating a signal and a misregistration amount calculation processing unit 41d for calculating a misregistration amount, and these functions are realized by the above program.

濃度情報取得手段４１ａは、撮像画像からインキが載った着色領域のＲＧＢデータを取得する画像ＲＧＢデータ取得処理部５１と、インキが載っていないシート下地領域のＲＧＢデータを取得する下地ＲＧＢデータ取得処理部５２と、これら着領域のＲＧＢデータと下地ＲＧＢデータとに基づき、シート下地の色で補正された後の印刷濃度情報を算出する濃度算出処理部５３とを備えている。 The density information acquisition means 41a includes an image RGB data acquisition processing unit 51 that acquires RGB data of a colored region on which ink is printed from an captured image, and a background RGB data acquisition process that acquires RGB data of a sheet background region on which ink is not printed. A unit 52 is provided, and a density calculation processing unit 53 that calculates print density information after being corrected by the color of the sheet background based on the RGB data of the landing area and the background RGB data.

画像ＲＧＢデータ取得処理部５１は、撮像手段２から取得した撮像画像データから、各インクで塗られた着色領域の箇所の画像ＲＧＢデータを検出し、これを記憶手段４２の画像ＲＧＢデータ記憶部４２ｂに記憶する。着色領域は、各インキで塗られた所定の領域を決めればよく、たとえば、形状によって認識できる所定の色の見当マークでもよいし、図柄の中から色ベクトルにより特定される各色の領域としてもよい。 The image RGB data acquisition processing unit 51 detects the image RGB data of the portion of the colored region painted with each ink from the image captured image data acquired from the image pickup means 2, and stores this in the image RGB data storage unit 42b of the storage means 42. Remember in. The colored region may be a predetermined region painted with each ink, and may be, for example, a register mark of a predetermined color that can be recognized by the shape, or may be a region of each color specified by a color vector from the pattern. ..

下地ＲＧＢデータ取得処理部５２は、同じく撮像手段２から取得した撮像画像データから、インクで塗られていない下地の領域の箇所のＲＧＢデータを検出し、これを記憶手段４２の下地ＲＧＢデータ記憶部４２ａに記憶する。 The background RGB data acquisition processing unit 52 detects RGB data in the area of the background that is not painted with ink from the captured image data also acquired from the image pickup means 2, and stores this as the background RGB data storage unit of the storage means 42. Store in 42a.

濃度算出処理部５３は、これら着色領域の各ＲＧＢデータと、記憶手段４２の下地ＲＧＢデータ記憶部４２ａに記憶されている下地ＲＧＢデータとから、各インキごとの着色領域の撮像画像の印刷濃度情報を算出し、補正後の印刷濃度情報として濃度データ記憶部４２ｃに記憶する。この補正後の印刷濃度情報は、各インキごとに算出して記憶される。具体的には、下記（式１）に基づき算出される濃度を、前記補正後の印刷濃度情報とする。 The density calculation processing unit 53 uses the RGB data of these colored regions and the background RGB data stored in the background RGB data storage unit 42a of the storage means 42 to print density information of the captured image of the colored region for each ink. Is calculated and stored in the density data storage unit 42c as the corrected print density information. The corrected print density information is calculated and stored for each ink. Specifically, the density calculated based on the following (Equation 1) is used as the corrected print density information.

Figure 0007037173000002
Figure 0007037173000002

判定手段４１ｂは、上記算出した各インキの着色領域の補正後の印刷濃度と各インキごとに用意された基準の濃度とを比較する比較値算出処理部５４と、比較した濃度差が許容値を超えているかどうか判定する許容判定処理部５５と、許容値を超えた場合に印刷装置のインキ量調整機構の調整量を算出する調整量算出処理部５６とを備えている。 The determination means 41b has a comparison value calculation processing unit 54 that compares the corrected print density of the colored region of each ink calculated above with the reference density prepared for each ink, and the compared density difference determines the allowable value. It includes an allowance determination processing unit 55 for determining whether or not the ink amount exceeds the permissible value, and an adjustment amount calculation processing unit 56 for calculating the adjustment amount of the ink amount adjustment mechanism of the printing apparatus when the permissible value is exceeded.

比較値算出処理部５４は、前記算出された撮像画像の各インキで塗られた領域の印刷濃度情報について、あらかじめ基準濃度データ記憶部４２ｄに記憶されている各インキごとの良品の印刷濃度情報を基準濃度とし、該基準濃度と比較した濃度比較値（濃度の差ΔＤ）を算出して、これを濃度比較値記憶部４２ｅに各インキ（印刷装置）ごとに記憶する。 The comparison value calculation processing unit 54 obtains the print density information of the non-defective product for each ink stored in the reference density data storage unit 42d in advance for the print density information of the area painted with each ink of the calculated image. A reference density is used, a density comparison value (difference in density ΔD) compared with the reference density is calculated, and this is stored in the density comparison value storage unit 42e for each ink (printing device).

許容判定処理部５５は、濃度比較値が所定の閾値を超えるか否かでインキ量（塗膜厚）の良否を判定し、その判定結果を判定結果記憶部４２ｆに記憶する。調整量算出処理部５６は、濃度比較値と判定結果に基づき、印刷装置の調整機構１２を制御するための調整量を算出し、これを調整量記憶部４２ｇに記憶する。そして、制御信号生成手段４１ｃは、前記調整量に基づき、印刷装置１１Ａ～１１Ｃのインキ量調整機構１２に送信する制御信号を生成し、調整機構１２に制御指令として送信する。 The permissible determination processing unit 55 determines whether the ink amount (coating thickness) is good or bad based on whether or not the density comparison value exceeds a predetermined threshold value, and stores the determination result in the determination result storage unit 42f. The adjustment amount calculation processing unit 56 calculates an adjustment amount for controlling the adjustment mechanism 12 of the printing device based on the density comparison value and the determination result, and stores this in the adjustment amount storage unit 42g. Then, the control signal generation means 41c generates a control signal to be transmitted to the ink amount adjustment mechanism 12 of the printing devices 11A to 11C based on the adjustment amount, and transmits the control signal to the adjustment mechanism 12 as a control command.

なお、本実施形態では、印刷装置の調整機構を制御するように構成したが、このような制御機能を省略することも勿論でき、たとえば、オペレータに対して判定結果を表示する表示手段を設けるにとどめたもの等でもよい。 Although the present embodiment is configured to control the adjustment mechanism of the printing apparatus, it is of course possible to omit such a control function, and for example, to provide a display means for displaying the determination result to the operator. It may be the one that has been stopped.

また、本実施形態の品質検査装置１は、見当ずれを検出する検査装置を兼ねている。見当ずれ量算出処理部４１ｄは、上記撮像手段２で撮像された撮像画像データに基づき、公知の方法により見当ずれ量を算出し、結果を見当ずれ量記憶部４２ｈに記憶する。たとえば、各版の見当マークを検出してずれ量を算出するものや、図柄で見当合わせするものも勿論可能である。これら見当ずれ量の算出は、本出願人がすでに出願している特開２０１２－２４０４００号公報や特開２０１５－２１９０５６号公報に記載の手法を用いることができる。 Further, the quality inspection device 1 of the present embodiment also serves as an inspection device for detecting misregistration. The misregistration amount calculation processing unit 41d calculates the misregistration amount by a known method based on the captured image data captured by the image pickup means 2, and stores the result in the misregistration amount storage unit 42h. For example, it is of course possible to detect the register mark of each plate and calculate the deviation amount, or to register by a pattern. For the calculation of these misregistration amounts, the methods described in Japanese Patent Application Laid-Open No. 2012-240400 and Japanese Patent Application Laid-Open No. 2015-219056 already filed by the present applicant can be used.

また、本実施形態の品質検査装置１は、図示しないが、インキの塗布量以外の図柄の印刷欠陥や汚れ、シートの汚れ等を検出する品質検査装置も兼ねている。このように、本発明の品質検査装置は、検査用の撮像手段２、照明手段３を兼用して見当ずれや図柄等の印刷品質とともに、インキ量をも同時に判定することができるものであり、コスト上昇を抑えつつ、オンラインで即座に見当、図柄とともにインキ量を検査でき、抜き取りチェックを省略でき、印刷の早期立ち上げも可能となり、印刷効率を著しく向上させることができる。 Further, although not shown, the quality inspection device 1 of the present embodiment also serves as a quality inspection device for detecting printing defects and stains of a pattern other than the amount of ink applied, stains on a sheet, and the like. As described above, the quality inspection apparatus of the present invention can simultaneously determine the amount of ink as well as the print quality such as misregistration and patterns by using both the image pickup means 2 and the lighting means 3 for inspection. While suppressing the cost increase, the ink amount can be inspected online immediately along with the register and the pattern, the sampling check can be omitted, the printing can be started early, and the printing efficiency can be significantly improved.

また、処理装置４１は、さらに撮像手段２で得られる画像情報の各インキ色の着色領域のＲＧＢレベルに基づき、デバイス・インディペンデント・カラーで表現されたインキ色情報を各インキごとに取得するインキ色情報取得手段を設けたものが好ましい。この場合も濃度の場合と同様、シート下地領域のＲＧＢレベルを用いて補正することが好ましい。前記インキ色情報としては、ＸＹＺ表色系に近似計算したものや、あらかじめ設定した変換テーブル（プロファイル）を用いて基準値の色空間であるＣＩＥ－Ｌａｂ表色系に変換したものなどが好ましい。 Further, the processing device 41 further acquires the ink color information expressed in the device independent color for each ink based on the RGB level of the colored region of each ink color of the image information obtained by the image pickup means 2. Those provided with ink color information acquisition means are preferable. In this case as well, it is preferable to correct using the RGB level of the sheet base region as in the case of the density. As the ink color information, it is preferable that the information is approximately calculated to the XYZ color system or converted to the CIE-Lab color system which is the color space of the reference value using a preset conversion table (profile).

以上、本発明の実施形態について説明したが、本発明はこうした実施例に何ら限定されるものではなく、本発明の要旨を逸脱しない範囲において種々なる形態で実施し得ることは勿論である。 Although the embodiments of the present invention have been described above, the present invention is not limited to these examples, and it is needless to say that the present invention can be implemented in various forms without departing from the gist of the present invention.

１ 品質検査装置
２ 撮像手段
３ 照明手段
１０ 搬送方向
１１Ａ，１１Ｂ，１１Ｃ 印刷装置
１２ 調整機構
４１ 処理装置
４１ａ 濃度情報取得手段
４１ｂ 判定手段
４１ｃ 制御信号生成手段
４１ｄ 見当ずれ量算出処理部
４２ 記憶手段
４２ａ 下地ＲＧＢデータ記憶部
４２ｂ 画像ＲＧＢデータ記憶部
４２ｃ 濃度データ記憶部
４２ｄ 基準濃度データ記憶部
４２ｅ 濃度比較値記憶部
４２ｆ 判定結果記憶部
４２ｇ 調整量記憶部
４２ｈ 見当ずれ量記憶部
５１ 画像ＲＧＢデータ取得処理部
５２ 下地ＲＧＢデータ取得処理部
５３ 濃度算出処理部
５４ 比較値算出処理部
５５ 許容判定処理部
５６ 調整量算出処理部
Ｆ 撮像面
Ｐ 印刷面
Ｗ 段ボールシート 1 Quality inspection device 2 Imaging means 3 Lighting means 10 Transport direction 11A, 11B, 11C Printing device 12 Adjustment mechanism 41 Processing device 41a Concentration information acquisition means 41b Judgment means 41c Control signal generation means 41d Misregistration amount calculation processing unit 42 Storage means 42a Base RGB data storage 42b Image RGB data storage 42c Concentration data storage 42d Reference density data storage 42e Concentration comparison value storage 42f Judgment result storage 42g Adjustment amount storage 42h Misplaced amount storage 51 Image RGB data acquisition processing Part 52 Base RGB data acquisition processing part 53 Density calculation processing part 54 Comparison value calculation processing part 55 Allowance judgment processing part 56 Adjustment amount calculation processing part F Imaging surface P Printing surface W Cardboard sheet

Claims (7)

段ボールシートの印刷面を撮像する撮像手段と、
前記撮像手段による撮像面を照明する照明手段と、
前記撮像手段で得られる画像情報のＲＧＢレベルから印刷濃度情報を取得する濃度情報取得手段と、
前記濃度情報取得手段により取得された印刷濃度情報に基づき、前記印刷面のインキ量の良否を判定する判定手段とを備え、
前記濃度情報取得手段が、シート下地のＲＧＢレベル、および前記画像情報のＲＧＢレベルに基づき、シート下地の色で補正された印刷濃度情報を算出する、段ボールシートの品質検査装置。 An imaging means that captures the printed surface of a corrugated cardboard sheet,
Illumination means for illuminating the image pickup surface by the image pickup means, and
A density information acquisition means for acquiring print density information from the RGB level of the image information obtained by the image pickup means, and
A determination means for determining the quality of the ink amount on the printed surface based on the print density information acquired by the density information acquisition means is provided.
A corrugated cardboard sheet quality inspection device in which the density information acquisition means calculates print density information corrected by the color of the sheet base based on the RGB level of the sheet base and the RGB level of the image information. 前記判定手段が、あらかじめ記憶されている良品の印刷濃度情報を基準濃度とし、該基準濃度との比較によりインキ量の良否を判定する請求項１記載の段ボールシートの品質検査装置。 The quality inspection device for a corrugated cardboard sheet according to claim 1, wherein the determination means uses pre-stored print density information of a non-defective product as a reference density and determines the quality of the ink amount by comparison with the reference density. 前記撮像手段が、インキが載った着色領域と、インキが載っていないシート下地領域とを撮像し、
前記濃度情報取得手段が、前記撮像手段で得られた着色領域の画像情報のＲＧＢレベル、および下地領域の画像情報のＲＧＢレベルから、前記補正された印刷濃度情報を算出し、
前記判定手段が、前記着色領域の前記補正された印刷濃度情報に基づき、インキ量の良否を判定する、
請求項１又は２記載の段ボールシートの品質検査装置。 The image pickup means takes an image of a colored area on which ink is placed and a sheet base area on which ink is not placed.
The density information acquisition means calculates the corrected print density information from the RGB level of the image information of the colored region obtained by the imaging means and the RGB level of the image information of the background region.
The determination means determines the quality of the ink amount based on the corrected print density information of the colored region.
The quality inspection device for a corrugated cardboard sheet according to claim 1 or 2. 前記濃度情報取得手段が、下記（式１）に基づき算出される濃度を、前記補正された印刷濃度情報としてなる請求項１～３の何れか１項に記載の段ボールシートの品質検査装置。
Figure 0007037173000003
 The quality inspection device for a corrugated cardboard sheet according to any one of claims 1 to 3, wherein the density information acquisition means uses the density calculated based on the following (Equation 1) as the corrected print density information.
Figure 0007037173000003
 前記撮像手段で得られる画像情報のＲＧＢレベルに基づき、デバイス・インディペンデント・カラーで表現されたインキ色情報を取得するインキ色情報取得手段を設けた、請求項１～４の何れか１項に記載の段ボールシートの品質検査装置。 Any one of claims 1 to 4 , provided with an ink color information acquisition means for acquiring ink color information expressed in device independent color based on the RGB level of the image information obtained by the image pickup means. The quality inspection device for the corrugated sheet described in. 前記判定手段が、インキ量の必要な調整量を算出し、
該調整量に基づき、印刷装置のインキ量調整機構に送信する制御信号を生成する制御信号生成手段を設けた、請求項１～５の何れか１項に記載の段ボールシートの品質検査装置。 The determination means calculates the required adjustment amount of the ink amount, and
The quality inspection device for a corrugated cardboard sheet according to any one of claims 1 to 5 , provided with a control signal generating means for generating a control signal to be transmitted to the ink amount adjusting mechanism of the printing apparatus based on the adjusted amount. 前記撮像手段が、段ボールシートの見当合せのための画像取得手段を兼ねている、請求項１～６の何れか１項に記載の、段ボールシートの品質検査装置。
The quality inspection device for a corrugated cardboard sheet according to any one of claims 1 to 6 , wherein the image pickup means also serves as an image acquisition means for registering the corrugated cardboard sheet.
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