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JP2019136995A - Quality inspection device for cardboard sheet - Google Patents

Quality inspection device for cardboard sheet Download PDF

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JP2019136995A
JP2019136995A JP2018024186A JP2018024186A JP2019136995A JP 2019136995 A JP2019136995 A JP 2019136995A JP 2018024186 A JP2018024186 A JP 2018024186A JP 2018024186 A JP2018024186 A JP 2018024186A JP 2019136995 A JP2019136995 A JP 2019136995A
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ink
density information
cardboard sheet
imaging
quality inspection
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JP7037173B2 (en
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淳人 玉田
Atsuto Tamada
淳人 玉田
優 萬木
Yu Manki
優 萬木
正人 金川
Masato Kanekawa
正人 金川
宏巳 岡本
Hiromi Okamoto
宏巳 岡本
好孝 氷上
Yoshitaka Hikami
好孝 氷上
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Dac Engineering Co Ltd
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Dac Engineering Co Ltd
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Abstract

To provide technique capable of keeping track of fluctuations in the coating film thickness of ink during printing and adjusting the coating film thickness by accordingly adjusting an amount of ink transfer and viscosity before printing becomes defective.SOLUTION: A cardboard sheet quality inspection device includes: imaging means 2 for imaging a printing surface of a cardboard sheet; illumination means 3 for illuminating an imaging surface by the imaging means 2; density information acquisition means 41a for acquiring printing density information from RGB levels of image information acquired by the imaging means 2; and determination means 41b for determining whether an amount of ink on the printing surface is proper or not on the basis of the printing density information acquired by the density information acquisition means.SELECTED DRAWING: Figure 1

Description

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 cardboard sheet quality inspection apparatus.

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。   The cardboard sheet is printed by, for example, a flexographic printing machine as described in Patent Document 1. As a method for managing the color of ink, for example, as described in Patent Document 2, it has been proposed to measure a color by using a proofing 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 ink color is affected by the coating thickness (ink amount). That is, if the coating film thickness is thin, there is a problem in that the influence of the color of the base comes out and the required color does not appear. The coating thickness of the ink varies depending on the amount of ink transferred (primary amount), the properties of the sheet, the viscosity of the ink, and the like, and the amount of ink transferred also varies depending on the viscosity of the ink and various conditions of the printing machine. In addition, the viscosity of the ink also varies from time to time due to water vaporization of the water-based ink. The sheet properties are not constant, and vary greatly as 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 ink coating thickness always fluctuates greatly, and color management is not easy. Actually, during printing, the state of the printed material that is periodically removed is compared with the sample, and the printing device (transfer amount) is adjusted as necessary, and water is added to the ink. Currently.

特開平10−157079号公報JP-A-10-157079 特表2014−509279号公報Special table 2014-509279 gazette

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, in view of the above situation, the present invention intends to solve the problem of fluctuations in the coating thickness of the ink during printing, thereby adjusting the transfer amount and viscosity before printing becomes defective. It is in the point of providing the technique which enables adjustment of 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 film can be estimated by detecting the color of the ink on the printing surface of the corrugated cardboard sheet as a result of examination in view of the present situation. Because it is not possible to use a dedicated spectrometer such as, as a result of further diligent investigation, it is possible to easily determine the quality of the coating thickness by using the density information of the printed ink, if so For example, it is found that density information can be obtained online with a normal imaging camera by diverting an imaging camera of an inspection apparatus conventionally used for printing 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) Imaging means for imaging the printing surface of the cardboard sheet, illumination means for illuminating the imaging surface by the imaging means, and density information acquisition means for acquiring print density information from the RGB level of image information obtained by the imaging means And a cardboard sheet quality inspection apparatus comprising: a determination unit that determines whether the ink amount on the printing surface is good or not based on the print density information acquired by the density information acquisition unit.

(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 unit determines whether the ink amount is good or not by comparing the print density information of a non-defective product stored in advance with a 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 unit calculates print density information corrected with the color of the sheet background based on the RGB level of the sheet background and the RGB level of the image information. Sheet quality inspection device.

(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 imaging unit images a colored region on which ink is placed and a sheet base region on which ink is not placed, and the density information acquisition unit performs RGB of the image information on the colored region obtained by the imaging unit. The corrected print density information is calculated from the level and the RGB level of the image information of the background area, and the determination unit determines the quality of the ink amount based on the corrected print density information of the colored area. (1)-(3) The cardboard sheet quality inspection device 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 cardboard sheet quality inspection device according to (3) or (4), wherein the density information acquisition unit 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 imaging means is provided (1) to (5) The quality inspection apparatus for cardboard sheets according to any one 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 unit includes a control signal generation unit that calculates a necessary adjustment amount of the ink amount and generates a control signal to be transmitted to the ink amount adjustment mechanism of the printing apparatus based on the adjustment amount. The quality inspection apparatus for corrugated cardboard sheets according to any one of (1) to (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 cardboard sheet quality inspection device according to any one of (1) to (7), wherein the imaging unit also serves as an image acquisition unit for registering the 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 film thickness) on the printing surface is determined based on this print density information. The variation of the ink coating thickness can be grasped online during printing, so that the coating thickness can be adjusted by adjusting the transfer amount and viscosity before printing becomes defective. In addition, such an image pickup means can use a normal inexpensive image pickup camera, and can use the image pickup camera of an inspection apparatus conventionally used for printing quality and registration. 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。   In addition, in the case where the determination means determines whether the ink amount is good or bad by comparing the print density information of the non-defective product stored in advance with the reference density and comparing it with the reference density, the quality of the ink amount is determined more accurately by relative comparison 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, in the case where the density information acquisition means calculates the print density information corrected with the color of the sheet background based on the RGB level of the sheet background and the RGB level of the image information, the sheet property fluctuations, the illumination means Errors due to illumination fluctuations and other environmental fluctuations can be eliminated by correction, more accurate printing density information can be obtained, and the quality of the ink amount can be more accurately determined. In addition, since the influence of the color of the sheet background can be eliminated, the original color information of the ink can be obtained, thereby making it possible to accurately determine an error in the ink supply.

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 unit images a colored region on which ink is placed and a sheet ground region on which ink is not placed, and the density information acquisition unit obtains an image of the colored region obtained by the imaging unit. 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 area, and the determination means determines whether the ink amount is good or not based on the corrected print density information of the colored area. It 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 unit can realize the density calculated based on the following (Equation 1) as the corrected print density information.

Figure 2019136995
Figure 2019136995

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 ink color information acquisition means for acquiring ink color information expressed by device independent color based on the RGB level of image information obtained by the imaging means, the ink information is more detailed. It is possible to obtain the above-mentioned ink, and it is possible to accurately grasp the above-described mistakes in the introduction of ink.

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 printing apparatus, the determination unit includes a control signal generation unit that calculates a necessary adjustment amount of the ink amount and generates a control signal to be transmitted to the ink amount adjustment mechanism of the printing apparatus based on the adjustment amount. By controlling the ink amount adjusting mechanism, it is possible to perform feedback control 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, when 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 concerning 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。The block diagram which similarly shows the processing apparatus of a quality inspection apparatus. 同じく品質検査装置の記憶手段を示すブロック図。The block diagram which similarly shows the memory | storage means of a quality inspection apparatus.

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, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in FIG. 1, the cardboard sheet quality inspection apparatus 1 according to the present invention includes an imaging unit 2 that images a printing surface P of the cardboard sheet W, an illumination unit 3 that illuminates the imaging surface F by the imaging unit 2, Based on the density information acquisition unit 41a that acquires the print density information from the RGB level of the image information obtained by the unit 2 and the print density information acquired by the density information acquisition unit, the quality of the ink on the printing surface P is determined. And a determination unit 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 denote printing apparatuses that print different colors of ink, respectively. The number of printing devices is not limited. The printing apparatuses 11A, 11B, and 11C are, for example, flexographic printing machines, and can be applied to various printing apparatuses 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。   The image pickup means 2 is provided with a plurality of image pickup cameras along the width direction orthogonal to the conveyance direction 10 of the printed material, for example, in the same manner as the image pickup means used in the conventional registration misalignment and print quality inspection apparatus, and covers the entire width of the cardboard sheet W. An area is imaged. A line sensor camera in which a plurality of CCD or CMOS image sensors are arranged 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 the cardboard sheet W can be imaged. In addition to the line sensor camera, a single or a plurality of area sensor cameras in which a plurality of CCD and CMOS image sensors are arranged in the vertical and horizontal directions are provided. But you can. The illumination means may be a general illumination used in a normal inspection apparatus.

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 density information acquisition unit 41a and the determination unit 41b are provided in the processing device 41 constituting the computer. Reference numeral 42 denotes a storage means connected to the processing device 41. The processing device 41 is mainly configured by a CPU such as a microprocessor, and is connected to the imaging unit 2, the illuminating unit 3, the storage unit 42, and the adjustment mechanism 12 of the printing devices 11A to 11C through an input / output unit and a bus line. 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 includes a storage memory such as RAM and ROM inside and outside the processing device 41, a hard disk, and the like, and stores programs and processing data that define procedures of various processing operations in the processing device 41. FIG. 2 shows the configuration of the processing apparatus 41 of this embodiment, and FIG.

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 is functionally a control for controlling the adjustment mechanism of the printing apparatus based on the adjustment amount calculated by the determination unit 41b, in addition to the density information acquisition unit 41a and the determination unit 41b. At least a control signal generation unit 41c that generates a signal and a registration deviation amount calculation processing unit 41d that calculates a registration deviation amount are provided, and these functions are realized by the 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 unit 41a includes an image RGB data acquisition processing unit 51 that acquires RGB data of a colored area on which ink is applied from a captured image, and a background RGB data acquisition process that acquires RGB data of a sheet background area on which ink is not applied. And a density calculation processing unit 53 that calculates print density information after correction with the color of the sheet background, based on the RGB data and background RGB data of these landing areas.

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 image RGB data of a colored region painted with each ink from the captured image data acquired from the imaging unit 2, and detects this image RGB data storage unit 42 b of the storage unit 42. To remember. The colored area may be determined as a predetermined area painted with each ink. For example, it may be a register mark of a predetermined color that can be recognized by the shape, or may be an area of each color specified by a color vector from a design. .

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。   Similarly, the background RGB data acquisition processing unit 52 detects the RGB data of the portion of the background area that is not painted with ink from the captured image data acquired from the imaging unit 2, and stores this data in the background RGB data storage unit of the storage unit 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 calculates the print density information of the picked-up image of the colored region for each ink from each RGB data of these colored regions and the background RGB data stored in the background RGB data storage unit 42a of the storage unit 42. And is stored in the density data storage unit 42c as corrected print density information. The corrected print density information is calculated and stored for each ink. Specifically, the density calculated based on (Equation 1) below is used as the corrected print density information.

Figure 2019136995
Figure 2019136995

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 unit 41b includes a comparison value calculation processing unit 54 that compares the calculated print density of the colored region of each ink and the reference density prepared for each ink, and the compared density difference indicates an allowable value. An allowance determination processing unit 55 that determines whether or not the value exceeds the limit, and an adjustment amount calculation processing unit 56 that calculates the adjustment amount of the ink amount adjustment mechanism of the printing apparatus when the allowable 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 of the calculated captured image that is painted with each ink. A density comparison value (density difference ΔD) compared with the reference density is calculated as a reference density, and is stored in the density comparison value storage unit 42e for each ink (printing apparatus).

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 tolerance determination processing unit 55 determines whether the ink amount (coating film thickness) is good or not based on whether 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 apparatus 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 unit 41c generates a control signal to be transmitted to the ink amount adjustment mechanism 12 of the printing apparatuses 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。   In the present embodiment, the adjustment mechanism of the printing apparatus is controlled. However, such a control function can be omitted. For example, a display means for displaying the determination result for the operator is provided. It may be anything that you have 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。   Moreover, the quality inspection apparatus 1 of this embodiment also serves as an inspection apparatus that detects misregistration. The registration amount calculation processing unit 41d calculates a registration amount by a known method based on the captured image data captured by the imaging unit 2, and stores the result in the registration amount storage unit 42h. For example, it is of course possible to detect a registration mark of each plate and calculate a shift amount, or to register with a pattern. The calculation of these misregistration amounts can use the methods described in Japanese Patent Application Laid-Open No. 2012-240400 and Japanese Patent Application Laid-Open No. 2015-219056 filed by the present applicant.

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。   Although not shown, the quality inspection apparatus 1 according to the present embodiment also serves as a quality inspection apparatus that detects print defects or stains on symbols other than the amount of ink applied, stains on sheets, and the like. Thus, the quality inspection apparatus of the present invention is capable of simultaneously determining the amount of ink as well as the printing quality such as misregistration and design by using the imaging means 2 for inspection and the illumination means 3 together, While suppressing the increase in cost, it is possible to inspect the amount of ink together with the register and design immediately online, omit the sampling check, enable early start-up of printing, and remarkably improve printing efficiency.

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, for each ink, ink color information expressed in device, independent, and color based on the RGB level of the colored region of each ink color in the image information obtained by the imaging means 2. What provided the ink color information acquisition means is preferable. In this case as well, correction is preferably performed using the RGB level of the sheet base region, as in the case of density. As the ink color information, information approximated to the XYZ color system, or information converted into a CIE-Lab color system, which is a reference value color space, using a preset conversion table (profile) is preferable.

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 embodiments, and can of course 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
DESCRIPTION OF SYMBOLS 1 Quality inspection apparatus 2 Imaging means 3 Illumination means 10 Conveyance direction 11A, 11B, 11C Printing apparatus 12 Adjustment mechanism 41 Processing apparatus 41a Density information acquisition means 41b Determination means 41c Control signal generation means 41d Registration deviation amount calculation processing part 42 Storage means 42a Background RGB data storage unit 42b Image RGB data storage unit 42c Density data storage unit 42d Reference density data storage unit 42e Density comparison value storage unit 42f Determination result storage unit 42g Adjustment amount storage unit 42h Registration deviation amount storage unit 51 Image RGB data acquisition processing Unit 52 background RGB data acquisition processing unit 53 density calculation processing unit 54 comparison value calculation processing unit 55 tolerance determination processing unit 56 adjustment amount calculation processing unit F imaging surface P printing surface W cardboard sheet

Claims (8)

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。
Imaging means for imaging the printing surface of the cardboard sheet;
Illuminating means for illuminating the imaging surface of the imaging means;
Density information acquisition means for acquiring print density information from the RGB level of image information obtained by the imaging means;
A determination unit that determines whether the ink amount on the printing surface is good or not based on the print density information acquired by the density information acquisition unit.
Cardboard sheet quality inspection device.
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。   2. The corrugated cardboard sheet quality inspection apparatus according to claim 1, wherein the determination means determines whether the ink amount is good or not by comparing the print density information of good products stored in advance with a reference density. 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請求項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 sheet quality inspection apparatus according to claim 1, wherein the density information acquisition unit calculates print density information corrected with the color of the sheet background based on the RGB level of the sheet background and the RGB level of the image information. . 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1〜3の何れか1項に記載の段ボールシートの品質検査装置。
The imaging means images the colored area on which the ink is placed and the sheet base area on which the 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 area obtained by the imaging means and the RGB level of the image information of the background area,
The determination means determines the quality of the ink amount based on the corrected print density information of the colored area;
The quality inspection apparatus for cardboard sheets according to any one of claims 1 to 3.
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3又は4記載の段ボールシートの品質検査装置。
Figure 2019136995
The cardboard sheet quality inspection device according to claim 3 or 4, wherein the density information acquisition means uses the density calculated based on the following (formula 1) as the corrected print density information.
Figure 2019136995
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1〜5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 ink color information acquisition means for acquiring ink color information expressed in device-independent color based on the RGB level of image information obtained by the imaging means is provided. The cardboard sheet quality inspection device described in 1. 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1〜6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 determination means calculates a necessary adjustment amount of the ink amount,
The cardboard sheet quality inspection apparatus according to claim 1, further comprising a control signal generation unit configured to generate a control signal to be transmitted to an ink amount adjustment mechanism of a printing apparatus based on the adjustment 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1〜7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 cardboard sheet quality inspection apparatus according to any one of claims 1 to 7, wherein the imaging unit also serves as an image acquisition unit for registering the cardboard sheet.
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