JP4272561B2 - Image inspection system for printing press - Google Patents

Image inspection system for printing press Download PDF

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JP4272561B2
JP4272561B2 JP2004059709A JP2004059709A JP4272561B2 JP 4272561 B2 JP4272561 B2 JP 4272561B2 JP 2004059709 A JP2004059709 A JP 2004059709A JP 2004059709 A JP2004059709 A JP 2004059709A JP 4272561 B2 JP4272561 B2 JP 4272561B2
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inspection system
image inspection
printer
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image
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JP2004268584A (en
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アンドレアス・リッポルト
ハンス−ヴィリー・シュッツ
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マンローラント・アーゲー
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0036—Devices for scanning or checking the printed matter for quality control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/36—Blanking or long feeds; Feeding to a particular line, e.g. by rotation of platen or feed roller
    • B41J11/42—Controlling printing material conveyance for accurate alignment of the printing material with the printhead; Print registering
    • B41J11/46—Controlling printing material conveyance for accurate alignment of the printing material with the printhead; Print registering by marks or formations on the paper being fed

Abstract

Printer has line scan camera [2] to monitor printed labels for defects in printing, tears or oil drops on paper etc. Ink jet, laser or number print head [8] coupled to controller [4] marks label at location of defect, so label will be discarded in later process step. Link to signal generator [9] causes line scan camera [2] to be activated to monitor print on sheet.

Description

本発明は、請求項１の前提部分おいて書き部に記載の印刷機のための像検査システムに関する。   The present invention relates to an image inspection system for a printing press according to the first aspect of the present invention.

枚葉紙オフセット印刷機では、テスト枚葉紙を印刷機に通し、このテスト枚葉紙を別の検査台上に載せて目視及び／又は測定により把握し分析することにより印刷品質の評価が行われる。しかしながら、このような品質評価は、単にランダムに取られたサンプルに過ぎないため、品質が緩慢に変化して、かなり長い時間経過してからようやく誤りに気づくということがあると、そのときには、その時間に対応して既に大量の印刷損紙が発生してしまっている。また、テスト枚葉紙によっては、例えば、油はね、小泡ないし引っかき傷による偶発的に発生する品質上の欠陥は殆ど検出することは難しい。そのため、気付かないうちに然るべく多量の印刷損紙がデリバリに達することが避けられず、これらの印刷損紙は、次に相応の作業工程によって、後続の処理にとりかかる前に再び選別されなければならない。   In a sheet-fed offset printing machine, test quality is evaluated by passing a test sheet through the printing machine, placing the test sheet on another inspection table, and grasping and analyzing it visually and / or by measurement. Is called. However, such quality assessments are merely samples taken at random, so if the quality changes slowly and you notice a mistake only after a fairly long time, A lot of printing waste has already occurred in response to the time. Also, depending on the test sheet, it is difficult to detect quality defects that occur accidentally due to, for example, oil splashes, small bubbles or scratches. Therefore, it is inevitable that a large amount of printing waste reaches the delivery without realizing it, and these printing wastes must then be sorted again by the corresponding work process before proceeding with further processing. I must.

印刷機における恒常的な品質チェックは、特に最後の印刷装置の後のカメラによる撮像装置に加えて画像処理部を設ければ可能である。このような像検査システムは、例えば欧州特許出願公開第１１９０８５５号明細書（特許文献１）ならびに欧州特許出願公開第０８８４１８２号明細書（特許文献２）から公知となっている。撮像装置によって得られた画像データは、画素毎に予め設定された目標値と比較され、その後続けて、目標値からのずれがある場合には、警告メッセージが出されるか、もしくは印刷工程を補正するようにフィードバックがかけられる。   A constant quality check in the printing press is possible particularly if an image processing unit is provided in addition to an image pickup device using a camera after the last printing device. Such an image inspection system is known from, for example, European Patent Application No. 1190855 (Patent Document 1) and European Patent Application Publication No. 0881822 (Patent Document 2). The image data obtained by the imaging device is compared with a target value set in advance for each pixel, and subsequently, if there is a deviation from the target value, a warning message is issued or the printing process is corrected. Feedback is applied to

公知の画像検査システムを用いれば、枚葉紙を印刷品質に応じて別々のパイルに積むことも可能である。こうして、印刷損紙が自動的に選別され、さらに他の処理には送られない。   If a known image inspection system is used, the sheets can be stacked in separate piles according to the print quality. In this way, the printing waste paper is automatically sorted and is not sent to further processing.

折り畳み箱や瓶のラベルのように、複数の裁断予定部が印刷されるような印刷枚葉紙の場合にはまさしく、一つの裁断予定部の像位置に誤りがあれば、枚葉紙全体が印刷損紙になりかねない。ミスの無い他の裁断予定部は、上記のような評価をすれば、さらに処理することが十分可能であったにしても、やはりそれでも除外されることになってしまうであろう。 This is exactly the case for printed sheets such as folding boxes and bottle labels where multiple sections are printed. If there is an error in the image position of one section , the entire sheet will be It can be a waste paper for printing. Other cut-scheduled parts that have no mistakes will still be excluded if they are evaluated as described above, even though they can be processed further.

こういった事態を避けるために、独国実用新案出願公開第２００１０９２０号明細書（特許文献３）において提案されているのは、エラーの無い裁断予定部を、撮像装置からの信号より検出し、その結果、誤り無く印刷された裁断予定部に基づいて印刷すべき版を決めるというものである。ただし、後続の工程（例えばラベルや折り畳み式の箱の打ち抜き）においては、再度然るべき装置によってミスの無い裁断予定部が続いて検出されなければならない。 In order to avoid such a situation, German Utility Model Application Publication No. 20010920 (Patent Document 3) proposes that a cutting section without error is detected from a signal from an imaging device, As a result, a plate to be printed is determined based on the scheduled cutting portion printed without error. However, in a subsequent process (for example, punching of a label or a foldable box), a scheduled cutting portion without error must be detected again by an appropriate device.

独国特許発明第３９３８１３８号明細書（特許文献４）より、枚葉紙印刷機において版印刷（Auflagendruck）の品質を確保するための装置が知られている。この装置の場合、一つのランダムサンプルとなるテスト枚葉紙には、輪郭（Anlage）部分にマーキングが設けられている。続いてこの枚葉紙は、印刷後、排紙部においてストライプ挿入部によりパイル内で目印が付けられ、さらに光および／または音による信号が発せられて、その結果、上記枚葉紙を手で取り除くことができるようになっている。ランダムサンプルの分布によって、記録が出され、その結果、版印刷に関する印刷品質の記録文書が残されるようになっている。
欧州特許出願公開第１１９０８５５号明細書 欧州特許出願公開第０８８４１８２号明細書 独国実用新案出願公開第２００１０９２０号明細書 独国特許発明第３９３８１３８号明細書 From German Patent No. 3938138 (Patent Document 4), an apparatus for ensuring the quality of plate printing (Auflagendruck) in a sheet-fed printing machine is known. In the case of this apparatus, the test sheet which is one random sample is provided with markings on the contour portion (Anlage). Subsequently, after printing, the sheet is marked in the pile by the stripe insertion unit in the paper discharge unit, and further a signal by light and / or sound is emitted. As a result, the sheet is manually moved. It can be removed. A record is generated by the distribution of random samples, and as a result, a print quality record document relating to plate printing is left.
European Patent Application No. 1190855 European Patent Application No. 0884182 German Utility Model Application Publication No. 20010920 Specification German Patent Invention No. 3938138

本発明の課題は、印刷機のための像検査装置を拡張して、画像処理部を介して得られた情報を容易に印刷後にも利用できるようにすることにある。   An object of the present invention is to extend an image inspection apparatus for a printing press so that information obtained through an image processing unit can be easily used even after printing.

この課題は、請求項１の特徴部分に記載の構成によって解決される。本発明のさらに他の構成は、下位請求項に与えられている。   This problem is solved by the configuration described in the characterizing portion of claim 1. Further arrangements of the invention are given in the subclaims.

本発明によれば、撮像装置には、被印刷材料の進路を基準に、一つのプリンタ装置が後置され、該プリンタ装置を用いて、被印刷材料上の予め決められた位置にマーキングを形成することができるようになっている。 According to the present invention, the image pickup apparatus is provided with a single printer device based on the path of the material to be printed , and a marking is formed at a predetermined position on the material to be printed using the printer device. Can be done.

本発明に係る装置によれば、画像処理部を用いて、被印刷材料上で誤りがあると特定された部分に目印を付けることができるため、次に後続の処理において、作業従事者ないしさらに他の像検査システムによって検出することが可能となる。このようにして適した処置を容易に講ずることができ、印刷損紙を除外することができ、あるいはミスのある部分がその他の被印刷材料から分離される。   According to the apparatus of the present invention, the image processing unit can be used to mark a portion that is identified as having an error on the material to be printed. It can be detected by other image inspection systems. In this way, suitable measures can easily be taken, printing waste paper can be excluded, or misplaced parts can be separated from other printing materials.

撮像装置に後置されたプリンタ装置は、好ましくは番号付けに用いられるような、インクジェットプリンタ、レーザプリンタ、あるいはインパクト装置とすることができる。プリンタ装置は、番号付け（ナンバリング）装置とすることができる。被印刷材料上の予め決められた位置の目印となるマーキングは、ストライプ、矢印、あるいはまた、着色面として形成することができる。さらなる後続処理において自動認識させれば、本発明により設けられたプリンタ装置によって刻印されたマーキングが形成される。   The printer device placed behind the imaging device can be an inkjet printer, a laser printer, or an impact device, preferably used for numbering. The printer device may be a numbering device. The marking that serves as a mark of a predetermined position on the printing material can be formed as a stripe, an arrow, or a colored surface. If the automatic recognition is performed in further subsequent processing, a marking imprinted by the printer device provided by the present invention is formed.

本発明により設けられかつ画像処理部に後置されたプリンタ装置を用いることで、例えば誤りがあるとして認識された像位置に目印を付けることができる。このようなミスは、特に、インキ及び／又は油のはね、印刷表面の引っ掻き傷、あるいは小泡に起因する画像エラーが考えられる。非常に小さくかつ極めて見つけにくい画像エラー位置は、まさにこのようにしてマーキングによって強調され、その結果、対応する枚葉紙が作業従事者によって容易に見分けられて取り除かれるか、もしくは、さらなる後続処理で自動化的に除外することができる。   By using the printer device provided according to the present invention and placed after the image processing unit, it is possible to mark the image position recognized as having an error, for example. Such mistakes may be image errors due to ink and / or oil splashes, scratches on the printed surface, or small bubbles. Image error locations that are very small and very difficult to find are highlighted in this way by marking, so that the corresponding sheet is easily identified and removed by the operator or in further subsequent processing. It can be excluded automatically.

好適にも、本発明は、印刷において複数で用いることができる。ラベル印刷時には、できるだけ多くの枚数が得られるように印刷枚葉紙上に複数のラベルが配置される。さて、撮像装置ならびに画像処理部によって一つもしくは二つ以上のラベルにエラーが発見されたときには、後置されたプリンタ装置によって、これらのエラーのある一つもしくは二つ以上のラベルに目印を付けることができる。   Suitably, the present invention can be used in a plurality in printing. During label printing, a plurality of labels are arranged on the printed sheet so that as many sheets as possible can be obtained. When an error is found in one or more labels by the imaging device and the image processing unit, the one or more labels having these errors are marked by a printer device installed later. be able to.

ラベルを打ち抜き折り曲げるための打ち抜き装置ないし折り機に撮像装置及び画像処理部が設けられているときには、誤りがあるとして目印がつけられたラベルは、除外することができ、これにより、正しく印刷されたミスの無いラベルから分離することができる。こうして印刷損紙をさらに処理することは回避され、品質を確保するためのさらなる装置は省略することができる。   When a punching device or a folding machine for punching and bending a label is provided with an image pickup device and an image processing unit, a label marked as erroneous can be excluded, and thus printed correctly. It can be separated from the label without error. In this way further processing of the waste printing paper is avoided and further devices for ensuring quality can be omitted.

人間の目で見ることが出来るマーキングの代わりに、エラーのある像位置、裁断予定部に目には見えないマーキングを設けることができる。この目的のために、人間の知覚する範囲外にある、照明とインキの波長領域が選択される。さらなる後続の処理における制御装置、例えば、折り畳み式箱の製造の自動的なのりしろ折り制御は、然るべくこの分光学的な状態に適うものとなっている。 Instead of markings that can be seen by the human eye, it is possible to provide invisible markings at the image positions where errors occur, and at the portions to be cut . For this purpose, a wavelength range of illumination and ink that is outside the range perceived by humans is selected. Control devices in further subsequent processing, for example automatic marginal control of the production of the folding box, are accordingly suitable for this spectroscopic state.

以下に図面に基づき本発明の一実施形態を説明する。   Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

図１は、枚葉紙オフセット印刷機の最後尾の（最後の）印刷装置を示す。この印刷装置は、当該印刷装置に対して後側に置かれ（後置され）ると同時に送り出し装置に対しては前側に置かれ（前置され）る延長装置を備えている。図示されぬ前方（上流側）の印刷装置で印刷された枚葉紙は、最後の印刷装置の対向圧胴１によって搬送されかつ印刷される。この枚葉紙は、続いて上記対向圧胴１から渡し胴５を介して胴６に受け渡される。この胴から、次に送り出し装置のチェーンシステム（送り出し装置胴）への受け渡しが行われる。最後に、上記枚葉紙は、図示されたデリバリパイル上に積まれる。   FIG. 1 shows the last (last) printing device of a sheet offset printing press. The printing apparatus includes an extension device that is placed (rearly placed) on the rear side with respect to the printing device and at the same time is placed (frontward) on the front side with respect to the feeding device. A sheet printed by a front (upstream side) printing apparatus (not shown) is conveyed and printed by the counter impression cylinder 1 of the last printing apparatus. The sheet is then transferred from the counter impression cylinder 1 to the cylinder 6 via the transfer cylinder 5. Next, delivery from the cylinder to the chain system (delivery apparatus cylinder) of the delivery apparatus is performed. Finally, the sheet is stacked on the illustrated delivery pile.

最後の印刷装置の対向圧胴１には、ラインカメラとして構成された撮像装置２が設けられている。蛍光ランプとして構成された照明装置３によって、ラインカメラ２によって検出される枚葉紙の像位置が照明される。撮像装置２の背後には、画像処理部４が接続されている。このとき、画像処理部４は、好ましくは角度検出器として形成された信号送信部９にさらに接続されている。この信号送信部によって、対向圧胴１の表面上の被印刷材料の動きが検出可能とされている。信号送信部９は、印刷機の一つの胴に当接しており、図示された実施形態においては、最後の印刷装置の版胴上に設けられている。画像処理部４は、それぞれの印刷枚葉紙から画素毎にばらされた画像が存在するように、撮像装置２から送られてくる一行ずつ走査された画像データを、信号送信部９の信号と組み合わせて検知する。この画像データは、予め設定された目標値と比較することができ、続いて直ぐにどの裁断予定部位置をエラーとして判断すべきか決定できるようになっている。 The counter impression cylinder 1 of the last printing apparatus is provided with an imaging device 2 configured as a line camera. The image position of the sheet detected by the line camera 2 is illuminated by the illumination device 3 configured as a fluorescent lamp. An image processing unit 4 is connected behind the imaging device 2. At this time, the image processing unit 4 is further connected to a signal transmission unit 9 preferably formed as an angle detector. By this signal transmission unit, the movement of the printing material on the surface of the counter impression cylinder 1 can be detected. The signal transmission unit 9 is in contact with one cylinder of the printing press, and is provided on the plate cylinder of the last printing apparatus in the illustrated embodiment. The image processing unit 4 uses the image data scanned line by row sent from the imaging device 2 as a signal of the signal transmission unit 9 so that there is an image separated for each pixel from each printed sheet. Detect in combination. This image data can be compared with a target value set in advance, and then it is possible to immediately determine which cutting scheduled portion position should be determined as an error.

画像処理部４には、共通の横断バー７（横材）上に配設されかつ裁断予定部の配分（分布）に対応させるように枚葉紙に合わせることができるアライメント可能な複数のプリンタ装置８が設けられている。図２に示されているように、プリンタ装置８の数は、印刷枚葉紙上に配設された裁断予定部１１に対応している。プリンタ装置８は、レーザプリンタ、インクジェットプリンタ、又はよくあるような構成のプリンタ装置とされ、これらのプリンタ装置によって、実際の印刷速度に合わせて設けられるマーキング１３（図２）が、エラーを生じた裁断予定部に対応して設けられるように被印刷材料上に塗布可能とされている。 The image processing unit 4 includes a plurality of alignable printer devices that are arranged on a common crossing bar 7 (cross member) and can be adjusted to the sheet so as to correspond to the distribution (distribution) of the cutting scheduled portion. 8 is provided. As shown in FIG. 2, the number of printer devices 8 corresponds to the scheduled cutting portions 11 arranged on the printed sheet. The printer device 8 is a laser printer, an ink jet printer, or a printer device having a common configuration, and the marking 13 (FIG. 2) provided in accordance with the actual printing speed causes an error. It can be applied on the material to be printed so as to be provided corresponding to the part to be cut .

図２は、本発明を概略図によって分かりやすく説明するものである。図示されぬ対向圧胴１（図１）上にある印刷枚葉紙１０は、印刷方向に関して５つの間隙を有しており、この中に裁断予定部１１が配置されている。印刷枚葉紙１０の印刷方向（移動方向）は、矢印によって示されている。印刷枚葉紙１０上の走査行１２は、点線によって与えられており、これに従って、ラインカメラとして構成された撮像装置２が枚葉紙１０を走査する。 FIG. 2 illustrates the present invention in an easy-to-understand manner with a schematic diagram. The printed sheet 10 on the counter impression cylinder 1 (FIG. 1) (not shown) has five gaps with respect to the printing direction, and the cutting scheduled portion 11 is disposed therein. The printing direction (moving direction) of the printed sheet 10 is indicated by an arrow. A scanning row 12 on the printed sheet 10 is given by a dotted line, and the imaging device 2 configured as a line camera scans the sheet 10 in accordance with this.

共通の横断バー７上に調整可能に配置されたプリンタ装置８は、裁断予定部１１の配置に応じて調節されている。撮像装置２によって記録された枚葉紙１０の画像データは、画像処理部４内で目標値と比較され、その際、個々の裁断予定部は、印刷品質に関して分析される。画像処理部４は、次に、エラーがあるとして認識された枚葉紙１０上の裁断予定部１１にマーキング１３が設けられるように、信号送信部９の信号と合わせて個々のプリンタ装置を制御する。こうして、上記の印刷ミスのある裁断予定部が、然るべく構成されたさらなる処理用の装置内で容易に除去可能とされている。 The printer device 8 that is adjustably arranged on the common cross bar 7 is adjusted according to the arrangement of the cutting scheduled portion 11. The image data of the sheet 10 recorded by the imaging device 2 is compared with the target value in the image processing unit 4, and each cutting scheduled portion is analyzed with respect to the print quality. Next, the image processing unit 4 controls each printer device together with the signal of the signal transmission unit 9 so that the marking 13 is provided on the cutting scheduled portion 11 on the sheet 10 recognized as having an error. To do. In this way, it is possible to easily remove the scheduled cutting portion having a printing error in a further processing apparatus appropriately configured.

枚葉紙オフセット印刷機における本発明の印刷装置の構成を示す図である。It is a figure which shows the structure of the printing apparatus of this invention in a sheet-fed offset printer. 本発明に係る印刷枚葉紙のマーキングの概略図である。1 is a schematic view of marking on a printed sheet according to the present invention. FIG.

符号の説明Explanation of symbols

１・・・対向圧胴
２・・・撮像装置（ラインカメラ）
３・・・照明装置
４・・・画像処理部
５・・・渡し胴
６・・・胴
７・・・横断バー
８・・・プリンタ装置
９・・・信号送信部
１０・・・枚葉紙
１１・・・裁断予定部
１２・・・走査線（ラインカメラ）
１３・・・マーキング DESCRIPTION OF SYMBOLS 1 ... Counter pressure cylinder 2 ... Imaging device (line camera)
DESCRIPTION OF SYMBOLS 3 ... Illuminating device 4 ... Image processing part 5 ... Transfer cylinder 6 ... Cylinder 7 ... Crossing bar 8 ... Printer apparatus 9 ... Signal transmission part 10 ... Sheet paper 11: Cutting part 12 ... Scanning line (line camera)
13 ... Marking

Claims (7)

印刷機のための像検査システムであって、撮像装置（２）により、複数の裁断予定部（１１）を有して印刷される被印刷材料（１０）が検査されるとともに、得られた画像信号が後続の画像処理部（４）において処理される像検査システムにおいて、
前記撮像装置（２）には、前記画像信号に応じて制御可能なプリンタ装置（８）が後置され、該プリンタ装置によって、前記被印刷材料（１０）の予め決められた位置にマーキング（１３）が形成可能とされ、且つ、前記プリンタ装置（８）は、印刷機の送り出し装置に対して前置されている像検査システムにおいて、
前記撮像装置（２）には、複数のプリンタ装置（８）が設けられていると共に、
該複数のプリンタ装置（８）は、共通の横材（７）上に、前記複数の裁断予定部（１１）の分布に合わせて調節可能に配置されていることを特徴とする像検査システム。 An image inspection system for a printing press, in which a printing material (10) to be printed having a plurality of scheduled cutting portions (11) is inspected by an imaging device (2), and an image obtained In an image inspection system in which the signal is processed in a subsequent image processor (4),
The imaging device (2) is followed by a printer device (8) that can be controlled in accordance with the image signal, and marking (13) at a predetermined position of the printing material (10) by the printer device. ), And the printer device (8) is an image inspection system that is placed in front of a sending device of a printing press .
The imaging device (2) is provided with a plurality of printer devices (8),
The image inspection system , wherein the plurality of printer devices (8) are arranged on a common cross member (7) so as to be adjustable according to the distribution of the plurality of scheduled cutting portions (11). 請求項１に記載の像検査システムにおいて、
前記複数のプリンタ装置（８）は、インクジェットプリンタシステムとして構成されていることを特徴とする像検査システム。 The image inspection system according to claim 1.
The image inspection system, wherein the plurality of printer devices (8) are configured as an inkjet printer system. 請求項１に記載の像検査システムにおいて、
前記複数のプリンタ装置（８）は、レーザプリンタシステムとして構成されていることを特徴とする像検査システム。 The image inspection system according to claim 1.
The image inspection system, wherein the plurality of printer devices (8) are configured as a laser printer system. 請求項１に記載の像検査システムにおいて、
前記複数のプリンタ装置（８）は、番号付け装置として構成されていることを特徴とする像検査システム。 The image inspection system according to claim 1 .
The image inspection system, wherein the plurality of printer devices (8) are configured as numbering devices. 請求項１から請求項４のいずれか一項に記載の像検査システムにおいて、
前記複数のプリンタ装置（８）は、最後の印刷装置の対向圧胴（１）に後置され、前記印刷機の前記送り出し装置に前置されていることを特徴とする像検査システム。 In the image inspection system according to any one of claims 1 to 4 ,
The image inspection system according to claim 1, wherein the plurality of printer devices (8) are disposed behind the counter pressure cylinder (1) of the last printing device and are disposed before the feeding device of the printing press . 請求項１から請求項５のいずれか１項に記載の像検査システムにおいて、
前記複数のプリンタ装置（８）によって、目視可能なマーキングが前記被印刷材料（１０）上に形成可能とされていることを特徴とする像検査システム。 The image inspection system according to any one of claims 1 to 5 ,
An image inspection system characterized in that a visible marking can be formed on the printing material (10 ) by the plurality of printer devices (8). 請求項１から請求項５のいずれか１項に記載の像検査システムにおいて、
前記複数のプリンタ装置（８）によって、目に見えないマーキングが前記被印刷材料（１０）上に形成可能とされていることを特徴とする像検査システム。 The image inspection system according to any one of claims 1 to 5 ,
An image inspection system in which invisible markings can be formed on the printing material (10 ) by the plurality of printer devices (8).
JP2004059709A 2003-03-06 2004-03-03 Image inspection system for printing press Expired - Fee Related JP4272561B2 (en)

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