JP2014206437A - Mark sensor for photogravure printing machine - Google Patents

Mark sensor for photogravure printing machine Download PDF

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JP2014206437A
JP2014206437A JP2013083705A JP2013083705A JP2014206437A JP 2014206437 A JP2014206437 A JP 2014206437A JP 2013083705 A JP2013083705 A JP 2013083705A JP 2013083705 A JP2013083705 A JP 2013083705A JP 2014206437 A JP2014206437 A JP 2014206437A
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light
light receiving
printing machine
light emitting
mark sensor
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諭伴 長谷川
Satotomo Hasegawa
諭伴 長谷川
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Sumitomo Heavy Industries Ltd
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Sumitomo Heavy Industries Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a mark sensor for a photogravure printing machine capable of easily adjusting the relative positional relation and attitude of a light-receiving element and a light-emitting element.SOLUTION: A register mark printed on a printing base material delivered from a roll and conveyed is detected by the mark sensor for a photogravure printing machine. The mark sensor includes a housing, a mounting substrate attached to the housing, a light-receiving element mounted on the mounting substrate and detecting light made incident on a light-receiving point, a light-emitting element mounted on the mounting substrate and radiating illumination light, and a convergent lens attached to the housing. The illumination light radiated from the light-emitting element passes through the convergent lens and irradiates the printing base material under conveyance. Reflected light or scattered light from a point to be detected in a region irradiated with the illumination light passes through the convergent lens and is detected by the light-receiving element.

Description

本発明は、グラビア印刷機で印刷された印刷基材上のマークを検出するマークセンサに関する。   The present invention relates to a mark sensor that detects a mark on a printing substrate printed by a gravure printing machine.

カラー印刷物に光を照射して、その反射光をイメージセンサやフォトセンサ等の受光素子で検出し、絵柄の位置や形状を検出する絵柄検出装置が、下記の特許文献１に開示されている。この絵柄検出装置は、ラインイメージセンサ、レンズ系、及び発光ダイオードを含む。発光ダイオードは、赤色発光ダイオードと青色発光ダイオードとがそれぞれ１列に配列した構造を有する。ラインイメージセンサ、レンズ系、及び発光ダイオードは、ラインフォロワヘッドに内蔵される。   Japanese Patent Application Laid-Open Publication No. 2004-228688 discloses a pattern detection apparatus that detects the position and shape of a pattern by irradiating light on a color print and detecting the reflected light with a light receiving element such as an image sensor or a photosensor. The pattern detection apparatus includes a line image sensor, a lens system, and a light emitting diode. The light emitting diode has a structure in which red light emitting diodes and blue light emitting diodes are arranged in one row. The line image sensor, the lens system, and the light emitting diode are built in the line follower head.

ラインイメージセンサ及びレンズ系の光軸は、測定面に垂直に設定されており、発光ダイオードは、測定面に斜めから照明光を照射する。   The optical axes of the line image sensor and the lens system are set perpendicular to the measurement surface, and the light emitting diode irradiates the measurement surface with illumination light obliquely.

特開平８−２４０４１９号公報JP-A-8-240419

発光ダイオードからの照明光が、ラインイメージセンサで撮像すべき領域に入射するように、ラインイメージセンサ等の受光素子と、発光ダイオード等の発光素子との相対的な位置関係及び姿勢を調整しなければならない。この相対的な位置関係の調整は、受光素子と発光素子とをラインフォロワヘッドに取り付ける際に、または取り付けた後に行わなければならない。   The relative positional relationship and posture between the light receiving element such as the line image sensor and the light emitting element such as the light emitting diode must be adjusted so that the illumination light from the light emitting diode enters the area to be imaged by the line image sensor. I must. This relative positional adjustment must be performed when or after the light receiving element and the light emitting element are attached to the line follower head.

本発明の目的は、受光素子と発光素子との相対的な位置関係及び姿勢の調整を容易に行うことが可能なグラビア印刷機用マークセンサを提供することである。   An object of the present invention is to provide a mark sensor for a gravure printer that can easily adjust the relative positional relationship and posture between a light receiving element and a light emitting element.

本発明の一観点によると、
ロールから繰り出されて搬送される印刷基材に印刷された見当マークを検出するグラビア印刷機用マークセンサであって、
筐体と、
前記筐体に取り付けられた実装基板と、
前記実装基板に実装され、受光点に入射する光を検出する受光素子と、
前記実装基板に実装され、照明光を放射する発光素子と、
前記筐体に取り付けられたレンズと
を有し、
前記発光素子から放射された照明光が、前記収束レンズを通って、搬送中の前記印刷基材に照射され、前記照明光が照射された領域内の被検出点からの反射光または散乱光が、前記収束レンズを通って前記受光素子によって検出されるグラビア印刷機用マークセンサが提供される。 According to one aspect of the invention,
A mark sensor for a gravure printing machine that detects a registration mark printed on a printing substrate fed out from a roll and conveyed,
A housing,
A mounting board attached to the housing;
A light receiving element mounted on the mounting substrate for detecting light incident on the light receiving point;
A light emitting element mounted on the mounting substrate and emitting illumination light;
A lens attached to the housing,
Illumination light emitted from the light emitting element passes through the converging lens and is applied to the printing substrate being conveyed, and reflected light or scattered light from a detected point in the region irradiated with the illumination light is emitted. A mark sensor for a gravure printing machine that is detected by the light receiving element through the convergent lens is provided.

受光素子と発光素子とが、同一の実装基板に実装されているため、両者の相対的な位置関係、及び姿勢の調整を容易に行うことができる。   Since the light receiving element and the light emitting element are mounted on the same mounting substrate, the relative positional relationship and posture of both can be easily adjusted.

図１は、実施例１によるグラビア印刷機用マークセンサが組み込まれたグラビア印刷機の概略図である。FIG. 1 is a schematic view of a gravure printing machine in which a mark sensor for a gravure printing machine according to a first embodiment is incorporated. 図２は、実施例１によるグラビア印刷機用マークセンサの断面図である。FIG. 2 is a cross-sectional view of the mark sensor for a gravure printer according to the first embodiment. 図３Ａ及び図３Ｂは、発光素子から放射された照明光によって照明される照明領域と、被検出点との位置関係を示す平面図である。3A and 3B are plan views showing a positional relationship between an illumination area illuminated by illumination light emitted from a light emitting element and a detected point. 図４Ａは、印刷基材に印刷された第１の見当マーク、第２の見当マーク、及び被検出点の相対位置関係を示す平面図であり、図４Ｂは、マークセンサで検出される光強度の時間変化を示すグラフである。FIG. 4A is a plan view showing a relative positional relationship between the first register mark, the second register mark, and the detected point printed on the printing substrate, and FIG. 4B shows the light intensity detected by the mark sensor. It is a graph which shows the time change of. 図５は、実施例２によるグラビア印刷機用マークセンサの断面図である。FIG. 5 is a cross-sectional view of the mark sensor for a gravure printing machine according to the second embodiment. 図６Ａは、印刷基材に印刷された第１の見当マーク、第２の見当マーク、及び被検出点の相対位置関係を示す平面図であり、図６Ｂ及び図６Ｃは、マークセンサで検出される光強度の時間変化のグラフである。FIG. 6A is a plan view showing a relative positional relationship between a first register mark, a second register mark, and a detected point printed on a printing substrate, and FIGS. 6B and 6C are detected by a mark sensor. It is a graph of the time change of the light intensity. 図７は、実施例３によるグラビア印刷機用マークセンサの断面図である。FIG. 7 is a cross-sectional view of a mark sensor for a gravure printing machine according to a third embodiment.

［実施例１］
図１に、実施例１によるグラビア印刷機用マークセンサが組み込まれたグラビア印刷機の概略図を示す。印刷基材１０が繰り出しロール１１から繰り出されて、１段目印刷ユニット２１、２段目印刷ユニット２２、及び３段目印刷ユニット２３を順番に通過した後、巻き取りロール１２に巻き取られる。印刷基材１０には、紙、プラスチックフィルム等が用いられる。 [Example 1]
FIG. 1 is a schematic view of a gravure printing machine in which a mark sensor for a gravure printing machine according to the first embodiment is incorporated. After the printing substrate 10 is fed from the feeding roll 11 and sequentially passes through the first stage printing unit 21, the second stage printing unit 22, and the third stage printing unit 23, the printing substrate 10 is wound around the winding roll 12. For the printing substrate 10, paper, plastic film, or the like is used.

次に、２段目印刷ユニット２２の構成について説明する。版胴３０と圧胴３１との間に印刷基材１０が挟まれ、版胴３０及び圧胴３１が回転することにより、印刷基材１０が搬送される。版胴駆動機構３２が、制御装置４０から制御されて、版胴３０を回転させる。インキ容器３３にグラビアインキ３４が収容されている。   Next, the configuration of the second-stage printing unit 22 will be described. The printing substrate 10 is sandwiched between the plate cylinder 30 and the impression cylinder 31, and the printing cylinder 10 and the impression cylinder 31 are rotated, whereby the printing substrate 10 is conveyed. The plate cylinder drive mechanism 32 is controlled by the control device 40 to rotate the plate cylinder 30. A gravure ink 34 is accommodated in the ink container 33.

版胴３０の外周面（版面）の一部がグラビアインキ３４に接触している。版胴３０が回転すると、版胴３０の版面に形成されたセル（凹部）にグラビアインキ３４が保持された後、印刷基材１０に転写される。   A part of the outer peripheral surface (plate surface) of the plate cylinder 30 is in contact with the gravure ink 34. When the plate cylinder 30 rotates, the gravure ink 34 is held in the cells (concave portions) formed on the plate surface of the plate cylinder 30 and then transferred to the printing substrate 10.

版胴３０に原点マークが付されており、原点センサ３５が原点マークを検出する。原点センサ３５により原点マークが検出されると、制御装置４０に検出信号が入力される。制御装置４０は、版胴３０を回転させるモータのエンコーダ信号と、原点センサ３５からの検出信号とに基づいて、版胴３０の基準位置からの回転量を算出する。   An origin mark is attached to the plate cylinder 30 and the origin sensor 35 detects the origin mark. When the origin mark is detected by the origin sensor 35, a detection signal is input to the control device 40. The control device 40 calculates the amount of rotation from the reference position of the plate cylinder 30 based on the encoder signal of the motor that rotates the plate cylinder 30 and the detection signal from the origin sensor 35.

版胴３０と圧胴３１との間を通過した印刷基材１０の印刷面に、マークセンサ３６が対向している。マークセンサ３６は、印刷基材１０に印刷された見当マークを検出する。マークセンサ３６から制御装置４０に、検出信号が送信される。   A mark sensor 36 faces the printing surface of the printing substrate 10 that has passed between the plate cylinder 30 and the impression cylinder 31. The mark sensor 36 detects a registration mark printed on the printing substrate 10. A detection signal is transmitted from the mark sensor 36 to the control device 40.

１段目印刷ユニット２１及び３段目印刷ユニット２３の構成は、２段目印刷ユニット２２の構成と同一である。ただし、１段目印刷ユニット２１には、マークセンサ３６に相当するセンサが取り付けられていない。１段目印刷ユニット２１、２段目印刷ユニット２２、及び３段目印刷ユニット２３のインキ容器３３には、異なる色のグラビアインキ３４が収容されている。   The configurations of the first-tier printing unit 21 and the third-tier printing unit 23 are the same as the configurations of the second-tier printing unit 22. However, a sensor corresponding to the mark sensor 36 is not attached to the first-stage printing unit 21. In the ink containers 33 of the first-stage printing unit 21, the second-stage printing unit 22, and the third-stage printing unit 23, gravure inks 34 of different colors are accommodated.

図２に、マークセンサ３６の断面図を示す。以下、マークセンサ３６の構造について説明する。実装基板５５に、受光素子５０、発光素子５１、及び複数の駆動素子５２が実装されている。駆動素子５２は、受光素子５０及び発光素子５１を駆動する。実装基板５５は、筐体５８内に収容され、筐体５８に取り付けられて固定されている。受光素子５０に対向する位置に収束レンズ５６が配置されている。収束レンズ５６も、筐体５８に取り付けられて固定されている。実装基板５５は、収束レンズ５６の光軸に対して垂直な姿勢で筐体５８に取り付けられている。   FIG. 2 shows a cross-sectional view of the mark sensor 36. Hereinafter, the structure of the mark sensor 36 will be described. A light receiving element 50, a light emitting element 51, and a plurality of driving elements 52 are mounted on the mounting substrate 55. The drive element 52 drives the light receiving element 50 and the light emitting element 51. The mounting substrate 55 is accommodated in the housing 58 and attached to the housing 58 and fixed. A converging lens 56 is disposed at a position facing the light receiving element 50. The converging lens 56 is also attached and fixed to the housing 58. The mounting substrate 55 is attached to the housing 58 in a posture perpendicular to the optical axis of the converging lens 56.

受光素子５０は、その受光点５０Ａに入射する光を検出する。受光素子５０には、例えばフォトダイオードが用いられる。受光素子５０の受光点５０Ａは、収束レンズ５６の光軸上に配置されている。収束レンズ５６に関して、受光点５０Ａと共役な関係にある点が印刷基材１０の表面上に位置するように、印刷基材１０、収束レンズ５６、及び受光素子５０の相対位置関係が調整されている。受光点５０Ａと共役な関係にある点を、被検出点１５ということとする。受光点５０Ａの、収束レンズ５６による像が被検出点１５に相当する。印刷基材１０上の被検出点１５で散乱された光の一部が、収束レンズ５６で収束されて受光点５０Ａに入射する。   The light receiving element 50 detects light incident on the light receiving point 50A. For the light receiving element 50, for example, a photodiode is used. The light receiving point 50 </ b> A of the light receiving element 50 is disposed on the optical axis of the converging lens 56. With respect to the converging lens 56, the relative positional relationship between the printing base material 10, the converging lens 56, and the light receiving element 50 is adjusted so that a point conjugate to the light receiving point 50 </ b> A is located on the surface of the printing base material 10. Yes. A point having a conjugate relationship with the light receiving point 50 </ b> A is referred to as a detected point 15. An image of the light receiving point 50 </ b> A by the converging lens 56 corresponds to the detected point 15. A part of the light scattered at the detected point 15 on the printing substrate 10 is converged by the converging lens 56 and enters the light receiving point 50A.

発光素子５１は、収束レンズ５６の光軸から外れた位置に取り付けられており、照明光を放射する。図２では、２つの発光素子５１が実装基板５５に実装された例を示している。発光素子５１から放射された照明光は、収束レンズ５６を通って印刷基材１０に照射される。   The light emitting element 51 is mounted at a position off the optical axis of the converging lens 56 and emits illumination light. FIG. 2 shows an example in which two light emitting elements 51 are mounted on the mounting substrate 55. The illumination light emitted from the light emitting element 51 passes through the converging lens 56 and is applied to the printing substrate 10.

実装基板５５の表面（実装面）を基準として、発光素子５１の発光領域５１Ａは、受光素子５０の受光点５０Ａよりも高い位置に配置されている。このため、発光領域５１Ａは印刷基材１０の表面に結像しない。発光領域５１Ａが結像する位置は、収束レンズ５６から見て印刷基材１０よりも遠い。すなわち、発光領域５１Ａが収束レンズ５６によって印刷基材１０上にデフォーカスされる。発光領域５１Ａから放射された照明光が照射される照明領域内に、被検出点１５が含まれるように、受光素子５０、発光素子５１、及び収束レンズ５６の相対位置が調整されている。   The light emitting area 51 </ b> A of the light emitting element 51 is arranged at a position higher than the light receiving point 50 </ b> A of the light receiving element 50 with the surface (mounting surface) of the mounting substrate 55 as a reference. For this reason, the light emitting area 51 </ b> A does not form an image on the surface of the printing substrate 10. The position at which the light emitting region 51 </ b> A forms an image is farther from the printing substrate 10 when viewed from the converging lens 56. That is, the light emitting area 51 </ b> A is defocused on the printing substrate 10 by the converging lens 56. The relative positions of the light receiving element 50, the light emitting element 51, and the converging lens 56 are adjusted so that the detected point 15 is included in the illumination area irradiated with the illumination light emitted from the light emitting area 51A.

図３Ａに、発光素子５１（図２）から放射された照明光によって照明される照明領域１７と、被検出点１５との位置関係を示す。２つの発光素子５１（図２）からの照明光によって照明される２つの照明領域１７が、相互に部分的に重なる。２つの照明領域１７が重なった領域内に被検出点１５が位置する。実施例１では、発光素子５１の発光領域５１Ａを、印刷基材１０上にデフォーカスさせているため、フォーカスされる場合に比べて、被検出点１５の位置における照度が低下する。被検出点１５において２つの発光素子５１の照明領域１７を重ねることにより、デフォーカスによる照度の低下を補うことができる。   FIG. 3A shows the positional relationship between the illumination region 17 illuminated by the illumination light emitted from the light emitting element 51 (FIG. 2) and the detected point 15. The two illumination areas 17 illuminated by the illumination light from the two light emitting elements 51 (FIG. 2) partially overlap each other. The detected point 15 is located in the area where the two illumination areas 17 overlap. In Example 1, since the light emitting region 51A of the light emitting element 51 is defocused on the printing base material 10, the illuminance at the position of the detected point 15 is lower than in the case of being focused. By overlapping the illumination areas 17 of the two light emitting elements 51 at the detection point 15, it is possible to compensate for a decrease in illuminance due to defocusing.

被検出点１５における照度が不足する場合には、３個以上の発光素子５１（図２）を実装基板５５（図２）に実装してもよい。   When the illuminance at the detection point 15 is insufficient, three or more light emitting elements 51 (FIG. 2) may be mounted on the mounting substrate 55 (FIG. 2).

図３Ｂに、４個の発光素子５１を実装基板５５に実装した時の照明領域１７と被検出点１５との位置関係を示す。４つの照明領域１７が重なっている領域に、被検出点１５が配置されている。   FIG. 3B shows a positional relationship between the illumination region 17 and the detected point 15 when the four light emitting elements 51 are mounted on the mounting substrate 55. The detected point 15 is arranged in a region where the four illumination regions 17 overlap.

実施例１においては、図２に示したように、受光素子５０と発光素子５１とが同一の実装基板５５に実装されている。実装基板５５には、受光素子５０と発光素子５１とを実装すべき位置に、予めスルーホール等の位置決め構造が設けられている。このため、受光素子５０と発光素子５１との相対的な位置決めを容易に行うことができる。また、実装基板５５と収束レンズ５６とが、共に筐体５８に取り付けられているため、受光素子５０及び
発光素子５１に対して、収束レンズ５６を容易に位置決めすることができる。受光素子５０と発光素子５１との相対的な位置決めは、実装基板５５に実装した時点で既に完了している。このため、受光素子５０及び発光素子５１を筐体５８に取り付けた後に、両者の相対的な位置合わせを行う必要はない。
また、収束レンズ５６と発光素子５１との間、及び収束レンズ５６と受光素子５０との間に、光路を変換するミラーやプリズムが配置されていないため、煩雑な光路調整を行う必要がない。このため、製造コストの低減を図ることが可能になる。 In the first embodiment, as shown in FIG. 2, the light receiving element 50 and the light emitting element 51 are mounted on the same mounting board 55. The mounting substrate 55 is provided with a positioning structure such as a through hole in advance at a position where the light receiving element 50 and the light emitting element 51 are to be mounted. For this reason, relative positioning of the light receiving element 50 and the light emitting element 51 can be easily performed. In addition, since the mounting substrate 55 and the converging lens 56 are both attached to the housing 58, the converging lens 56 can be easily positioned with respect to the light receiving element 50 and the light emitting element 51. The relative positioning of the light receiving element 50 and the light emitting element 51 is already completed when the light receiving element 50 and the light emitting element 51 are mounted on the mounting substrate 55. For this reason, after attaching the light receiving element 50 and the light emitting element 51 to the housing | casing 58, it is not necessary to perform relative alignment of both.
In addition, since no mirror or prism that converts the optical path is disposed between the converging lens 56 and the light emitting element 51 and between the converging lens 56 and the light receiving element 50, it is not necessary to perform complicated optical path adjustment. For this reason, it is possible to reduce the manufacturing cost.

図４Ａ及び図４Ｂを参照して、印刷基材１０（図１）に印刷された見当マークの検出方法について説明する。   With reference to FIG. 4A and FIG. 4B, the detection method of the registration mark printed on the printing base material 10 (FIG. 1) is demonstrated.

図４Ａに、印刷基材１０に印刷された第１の見当マーク６１及び第２の見当マーク６２と、被検出点１５との相対位置関係を示す。第１の見当マーク６１は、１段目印刷ユニット２１で印刷され、第２の見当マーク６２は、２段目印刷ユニット２２で印刷されたものである。第１の見当マーク６１及び第２の見当マーク６２の形状は、例えば直角二等辺三角形である。印刷基材１０の表面は、例えば白色であり、入射する照明光を散乱させる。一例として、第１の見当マーク６１は黒色であり、第２の見当マーク６２は赤色である。   FIG. 4A shows a relative positional relationship between the first registration mark 61 and the second registration mark 62 printed on the printing substrate 10 and the detected point 15. The first registration mark 61 is printed by the first-stage printing unit 21, and the second registration mark 62 is printed by the second-stage printing unit 22. The shapes of the first registration mark 61 and the second registration mark 62 are, for example, right-angled isosceles triangles. The surface of the printing substrate 10 is, for example, white, and scatters incident illumination light. As an example, the first registration mark 61 is black, and the second registration mark 62 is red.

印刷基材１０が図の矢印の方向に搬送されると、第１の見当マーク６１及び第２の見当マーク６２も搬送方向に移動する。被検出点１５の位置は、マークセンサ３６（図１、図２）に固定されているため、印刷基材１０が搬送されても被検出点１５は移動しない。印刷基材１０が搬送されるとき、第１の見当マーク６１及び第２の見当マーク６２が、被検出点１５を通過する。   When the printing substrate 10 is conveyed in the direction of the arrow in the figure, the first registration mark 61 and the second registration mark 62 also move in the conveyance direction. Since the position of the detected point 15 is fixed to the mark sensor 36 (FIGS. 1 and 2), the detected point 15 does not move even if the printing substrate 10 is conveyed. When the printing substrate 10 is conveyed, the first registration mark 61 and the second registration mark 62 pass through the detected point 15.

図４Ｂに、マークセンサ３６（図１）で検出される光強度の時間変化の一例を示す。第１の見当マーク６１及び第２の見当マーク６２が被検出点１５を通過するとき、受光素子５０（図１）で検出される散乱光の強度が低下する。第１の見当マーク６１に対応して、光強度の谷６１ａが現れ、第２の見当マーク６２に対応して、光強度の谷６２ａが現れる。第１の見当マーク６１が黒色であり、第２の見当マーク６２が赤色であるとき、第１の見当マーク６１からの散乱光の強度が、第２の見当マーク６２からの散乱光の強度より低い。このため、第１の見当マーク６１に対応する光強度の谷６１ａが、第２の見当マーク６２に対応する光強度の谷６２ａより深い。   FIG. 4B shows an example of a temporal change in light intensity detected by the mark sensor 36 (FIG. 1). When the first registration mark 61 and the second registration mark 62 pass through the detected point 15, the intensity of the scattered light detected by the light receiving element 50 (FIG. 1) decreases. A light intensity trough 61a appears corresponding to the first register mark 61, and a light intensity trough 62a appears corresponding to the second register mark 62. When the first registration mark 61 is black and the second registration mark 62 is red, the intensity of the scattered light from the first registration mark 61 is greater than the intensity of the scattered light from the second registration mark 62. Low. Therefore, the light intensity valley 61 a corresponding to the first registration mark 61 is deeper than the light intensity valley 62 a corresponding to the second registration mark 62.

光強度の谷６１ａが現れてから、光強度の谷６２ａが現れるまでの経過時間と、印刷基材１０の搬送速度とに基づいて、第１の見当マーク６１と第２の見当マーク６２との間隔を求めることができる。   Based on the elapsed time from the appearance of the light intensity valley 61a to the appearance of the light intensity valley 62a and the conveyance speed of the printing substrate 10, the first registration mark 61 and the second registration mark 62 The interval can be determined.

制御装置４０（図１）は、第１の見当マーク６１と第２の見当マーク６２との間隔の測定値と、その設計値とを比較する。間隔の測定値が設計値からずれている場合には、測定値が設計値に近づくように、版胴駆動機構３２（図１）を制御する。これにより、１段目印刷ユニット２１、２段目印刷ユニット２２、及び３段目印刷ユニット２３で印刷される模様の相対的な位置を合わせることができる。   The control device 40 (FIG. 1) compares the measured value of the distance between the first register mark 61 and the second register mark 62 with its design value. When the measured value of the interval is deviated from the design value, the plate cylinder driving mechanism 32 (FIG. 1) is controlled so that the measured value approaches the design value. Thereby, the relative positions of the patterns printed by the first-stage printing unit 21, the second-stage printing unit 22, and the third-stage printing unit 23 can be matched.

［実施例２］
図５に、実施例２によるグラビア印刷機用マークセンサ３６の断面図を示す。以下、実施例１との相違点について説明し、同一の構成については説明を省略する。 [Example 2]
FIG. 5 is a sectional view of the gravure printing machine mark sensor 36 according to the second embodiment. Hereinafter, differences from the first embodiment will be described, and description of the same configuration will be omitted.

実施例２においては、１つの筐体５８に、２つの受発光光学系７０Ａ、７０Ｂが搭載されている。受発光光学系７０Ａ、７０Ｂの各々は、図２に示した筐体５８内の光学系と同一の構成を有する。一方の受発光光学系７０Ａの収束レンズ５６Ａの光軸と、他方の受発
光光学系７０Ｂの収束レンズ５６Ｂの光軸とは、相互に平行である。印刷基材１０の表面に、受発光光学系７０Ａ、７０Ｂの被検出点１５Ａ、１５Ｂが画定される。 In the second embodiment, two light receiving / emitting optical systems 70A and 70B are mounted on one housing 58. Each of the light receiving / emitting optical systems 70A and 70B has the same configuration as the optical system in the housing 58 shown in FIG. The optical axis of the converging lens 56A of one light receiving / emitting optical system 70A and the optical axis of the converging lens 56B of the other light receiving / emitting optical system 70B are parallel to each other. Detection points 15A and 15B of light receiving and emitting optical systems 70A and 70B are defined on the surface of the printing substrate 10.

図６Ａ及び図６Ｂを参照して、印刷基材１０（図１）に印刷された見当マークの検出方法について説明する。   With reference to FIG. 6A and FIG. 6B, the detection method of the registration mark printed on the printing base material 10 (FIG. 1) is demonstrated.

図６Ａに、印刷基材１０に印刷された第１の見当マーク６１、第２の見当マーク６２、及び被検出点１５Ａ、１５Ｂの相対位置関係を示す。２つの被検出点１５Ａ、１５Ｂは、印刷基材１０の搬送方向と平行な方向に並んでいる。被検出点１５Ａと１５Ｂとの間隔は、第１の見当マーク６１と第２の見当マーク６２との間隔の設計値と等しくなるように、受発光光学系７０Ａと受発光光学系７０Ｂとが位置決めされている。印刷基材１０が搬送されるとき、第１の見当マーク６１及び第２の見当マーク６２が、被検出点１５Ａ、１５Ｂを通過する。   FIG. 6A shows the relative positional relationship between the first register mark 61, the second register mark 62, and the detected points 15A and 15B printed on the printing substrate 10. The two detected points 15 </ b> A and 15 </ b> B are arranged in a direction parallel to the conveyance direction of the printing substrate 10. The light receiving / emitting optical system 70A and the light receiving / emitting optical system 70B are positioned so that the distance between the detected points 15A and 15B is equal to the design value of the distance between the first register mark 61 and the second register mark 62. Has been. When the printing substrate 10 is conveyed, the first registration mark 61 and the second registration mark 62 pass through the detected points 15A and 15B.

図６Ｂに、マークセンサ３６（図５）で検出される光強度の時間変化の一例を示す。図６Ｂには、受発光光学系７０Ａ、７０Ｂでそれぞれ検出される光強度の時間変化７１Ａ、７１Ｂが実線で示されている。受発光光学系７０Ａで検出される光強度の時間変化７１Ａに、第１の見当マーク６１及び第２の見当マーク６２に対応する光強度の谷６１ａ、６２ａが現れている。同様に、他方の受発光光学系７０Ｂで検出される光強度の時間変化７１Ｂに、第１の見当マーク６１及び第２の見当マーク６２に対応する光強度の谷６１ｂ、６２ｂが現れている。   FIG. 6B shows an example of a temporal change in light intensity detected by the mark sensor 36 (FIG. 5). In FIG. 6B, the time changes 71A and 71B of the light intensity detected by the light receiving and emitting optical systems 70A and 70B, respectively, are indicated by solid lines. Light intensity valleys 61a and 62a corresponding to the first registration mark 61 and the second registration mark 62 appear in the time change 71A of the light intensity detected by the light receiving and emitting optical system 70A. Similarly, light intensity troughs 61b and 62b corresponding to the first registration mark 61 and the second registration mark 62 appear in the time change 71B of the light intensity detected by the other light receiving and emitting optical system 70B.

第１の見当マーク６１と第２の見当マーク６２との間隔が設計値どおりである場合、一方の受発光光学系７０Ａで検出された第２の見当マーク６２に対応する光強度の谷６２ａと、他方の受発光光学系７０Ｂで検出された第１の見当マーク６１に対応する光強度の谷６１ｂとの時間軸上の位置が一致する。   When the distance between the first registration mark 61 and the second registration mark 62 is as designed, the light intensity valley 62a corresponding to the second registration mark 62 detected by one of the light receiving and emitting optical systems 70A The position on the time axis coincides with the valley 61b of the light intensity corresponding to the first registration mark 61 detected by the other light receiving / emitting optical system 70B.

第１の見当マーク６１と第２の見当マーク６２との間隔が設計値からずれている場合、図６Ｃに示すように、一方の受発光光学系７０Ａで検出された光強度の谷６２ａと、他方の受発光光学系７０Ｂで検出された光強度の谷６１ｂとの時間軸上の位置がずれる。２つの受発光光学系７０Ａ、７０Ｂで検出された検出信号に基づいて、第１の見当マーク６１と第２の見当マーク６２との間隔の、設計値からのずれを容易に検出することができる。   When the interval between the first registration mark 61 and the second registration mark 62 is deviated from the design value, as shown in FIG. 6C, a trough 62a of the light intensity detected by one of the light receiving and emitting optical systems 70A, The position on the time axis is shifted from the valley 61b of the light intensity detected by the other light receiving / emitting optical system 70B. Based on the detection signals detected by the two light receiving and emitting optical systems 70A and 70B, it is possible to easily detect a deviation from the design value of the interval between the first registration mark 61 and the second registration mark 62. .

実施例２においては、受発光光学系７０Ａ、７０Ｂの各々が、実施例１によるグラビア印刷機用マークセンサ３６（図２）の筐体５８内の光学系と同一の構成を有する。このため、実施例１と同様に、製造コストの低減を図ることが可能になる。   In the second embodiment, each of the light receiving / emitting optical systems 70A and 70B has the same configuration as the optical system in the housing 58 of the gravure printing machine mark sensor 36 (FIG. 2) according to the first embodiment. For this reason, as in the first embodiment, it is possible to reduce the manufacturing cost.

［実施例３］
図７を参照して、実施例３によるグラビア印刷機用マークセンサについて説明する。以下、実施例１との相違点について説明し、同一の構成については説明を省略する。 [Example 3]
With reference to FIG. 7, the mark sensor for gravure printing machines by Example 3 is demonstrated. Hereinafter, differences from the first embodiment will be described, and description of the same configuration will be omitted.

図７に、実施例３によるグラビア印刷機用マークセンサ３６の断面図を示す。収束レンズ５６と受光素子５０との間の光軸上に分岐光学系８１が配置されている。発光素子５１の発光領域５１Ａから放射した照明光が、折り返しミラー８０で反射した後、一部の成分が分岐光学系８１で反射する。分岐光学系８１で反射した照明光は、被検出点１５から受光点５０Ａに向かう光の経路と重なり、かつ被検出点１５から受光点５０Ａに向かう光とは反対向きに伝搬する。このため、照明光が印刷基材１０に垂直入射する。分岐光学系８１には、例えばハーフミラーが用いられる。折り返しミラー８０で反射した後、分岐光学系８１を透過した照明光は、ダンパ８２に吸収される。実施例３の場合には、受光点５０Ａと、発光領域５１Ａとで、高さを異ならせる必要はない。   FIG. 7 is a cross-sectional view of the gravure printing machine mark sensor 36 according to the third embodiment. A branching optical system 81 is disposed on the optical axis between the converging lens 56 and the light receiving element 50. Illumination light radiated from the light emitting region 51 </ b> A of the light emitting element 51 is reflected by the folding mirror 80, and then a part of the components is reflected by the branching optical system 81. The illumination light reflected by the branching optical system 81 overlaps the light path from the detected point 15 toward the light receiving point 50A, and propagates in the opposite direction to the light from the detected point 15 toward the light receiving point 50A. For this reason, the illumination light is perpendicularly incident on the printing substrate 10. For example, a half mirror is used for the branching optical system 81. The illumination light reflected by the folding mirror 80 and then transmitted through the branching optical system 81 is absorbed by the damper 82. In the case of the third embodiment, it is not necessary to make the heights different between the light receiving point 50A and the light emitting region 51A.

印刷基材１０の背面に、ミラー８３が配置されている。実施例３では、印刷基材１０として、透明シートが用いられる。印刷基材１０に垂直入射した照明光は、印刷基材１０を透過した後、ミラー８３で反射されて、入射経路を逆向きに辿る。反射光の一部は、分岐光学系８１を透過して受光素子５０に入射する。被検出点１５の位置を第１の見当マーク６１または第２の見当マーク６２が通過している期間は、照明光がミラー８３まで到達しない。このとき、受光素子５０には、照明光のうち第１の見当マーク６１または第２の見当マーク６２からの散乱光のうち一部の光のみが受光素子５０に入射する。このため、受光素子５０で検出される光強度が低下する。受光素子５０で検出される光強度の変化により、第１の見当マーク６１及び第２の見当マーク６２を検出することができる。   A mirror 83 is disposed on the back surface of the printing substrate 10. In Example 3, a transparent sheet is used as the printing substrate 10. Illumination light perpendicularly incident on the printing substrate 10 passes through the printing substrate 10 and is then reflected by the mirror 83 to follow the incident path in the reverse direction. A part of the reflected light passes through the branch optical system 81 and enters the light receiving element 50. During the period when the first registration mark 61 or the second registration mark 62 passes through the position of the detected point 15, the illumination light does not reach the mirror 83. At this time, only a part of the scattered light from the first registration mark 61 or the second registration mark 62 in the illumination light is incident on the light receiving element 50. For this reason, the light intensity detected by the light receiving element 50 decreases. The first registration mark 61 and the second registration mark 62 can be detected by the change in the light intensity detected by the light receiving element 50.

実施例３においても、受光素子５０と発光素子５１とが同一の実装基板５５に実装されている。このため、実施例１の場合と同様に、受光素子５０と発光素子５１との相対的な位置決めを容易に行うことができる。また、実装基板５５と収束レンズ５６とが、共に筐体５８に取り付けられているため、受光素子５０及び発光素子５１に対して、収束レンズ５６を容易に位置決めすることができる。折り返しミラー８０及び分岐光学系８１の位置及び姿勢の調整は、実装基板５５及び収束レンズ５６を位置決めした後に行うことができる。   Also in the third embodiment, the light receiving element 50 and the light emitting element 51 are mounted on the same mounting board 55. For this reason, as in the case of the first embodiment, the relative positioning of the light receiving element 50 and the light emitting element 51 can be easily performed. In addition, since the mounting substrate 55 and the converging lens 56 are both attached to the housing 58, the converging lens 56 can be easily positioned with respect to the light receiving element 50 and the light emitting element 51. The position and orientation of the folding mirror 80 and the branching optical system 81 can be adjusted after the mounting substrate 55 and the converging lens 56 are positioned.

以上実施例に沿って本発明を説明したが、本発明はこれらに制限されるものではない。例えば、種々の変更、改良、組み合わせ等が可能なことは当業者に自明であろう。   Although the present invention has been described with reference to the embodiments, the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications, improvements, combinations, and the like can be made.

１０ 印刷基材
１１ 繰り出しロール
１２ 巻き取りロール
１５、１５Ａ、１５Ｂ 被検出点
１７ 照明領域
２１、２２、２３ 印刷ユニット
３０ 版胴
３１ 圧胴
３２ 版胴駆動機構
３３ インキ容器
３４ グラビアインキ
３５ 原点センサ
３６ マークセンサ
４０ 制御装置
５０ 受光素子
５０Ａ 受光点
５１ 発光素子
５１Ａ 発光領域
５２ 駆動素子
５５ 実装基板
５６、５６Ａ、５６Ｂ 収束レンズ
５８ 筐体
６１ 第１の見当マーク
６１ａ、６１ｂ 第１の見当マークに対応する光強度の谷
６２ 第２の見当マーク
６２ａ、６２ｂ 第２の見当マークに対応する光強度の谷
７０Ａ、７０Ｂ 受発光光学系
７１Ａ、７１Ｂ 光強度の時間変化
８０ 折り返しミラー
８１ 分岐光学系
８２ ダンパ
８３ ミラー DESCRIPTION OF SYMBOLS 10 Printing base material 11 Feeding roll 12 Winding roll 15, 15A, 15B Detected point 17 Illumination area 21, 22, 23 Printing unit 30 Plate cylinder 31 Impression cylinder 32 Plate cylinder drive mechanism 33 Ink container 34 Gravure ink 35 Origin sensor 36 Mark sensor 40 Control device 50 Light receiving element 50A Light receiving point 51 Light emitting element 51A Light emitting area 52 Driving element 55 Mounting substrate 56, 56A, 56B Converging lens 58 Housing 61 First registration mark 61a, 61b Corresponding to the first registration mark Light intensity trough 62 Second registration marks 62a, 62b Light intensity troughs 70A, 70B corresponding to the second registration marks Light receiving / emitting optical systems 71A, 71B Light intensity time change 80 Folding mirror 81 Branching optical system 82 Damper 83 mirror

Claims (6)

ロールから繰り出されて搬送される印刷基材に印刷された見当マークを検出するグラビア印刷機用マークセンサであって、
筐体と、
前記筐体に取り付けられた実装基板と、
前記実装基板に実装され、受光点に入射する光を検出する受光素子と、
前記実装基板に実装され、照明光を放射する発光素子と、
前記筐体に取り付けられた収束レンズと
を有し、
前記発光素子から放射された照明光が、前記収束レンズを通って、搬送中の前記印刷基材に照射され、前記照明光が照射された領域内の被検出点からの反射光または散乱光が、前記収束レンズを通って前記受光素子によって検出されるグラビア印刷機用マークセンサ。 A mark sensor for a gravure printing machine that detects a registration mark printed on a printing substrate fed out from a roll and conveyed,
A housing,
A mounting board attached to the housing;
A light receiving element mounted on the mounting substrate for detecting light incident on the light receiving point;
A light emitting element mounted on the mounting substrate and emitting illumination light;
A converging lens attached to the housing;
Illumination light emitted from the light emitting element passes through the converging lens and is applied to the printing substrate being conveyed, and reflected light or scattered light from a detected point in the region irradiated with the illumination light is emitted. A gravure printing machine mark sensor detected by the light receiving element through the converging lens. 前記実装基板は、前記収束レンズの光軸に対して垂直な姿勢で前記筐体に取り付けられている請求項１に記載のグラビア印刷機用マークセンサ。   The gravure printing machine mark sensor according to claim 1, wherein the mounting substrate is attached to the housing in a posture perpendicular to the optical axis of the converging lens. 前記受光素子の受光点及び前記被検出点は、前記収束レンズの光軸上に配置されている請求項１または２に記載のグラビア印刷機用マークセンサ。   3. The mark sensor for a gravure printing machine according to claim 1, wherein a light receiving point of the light receiving element and the detected point are arranged on an optical axis of the convergent lens. 前記発光素子は、前記収束レンズの光軸から外れた位置に取り付けられており、前記発光素子の発光領域が、前記収束レンズによって前記印刷基材上にデフォーカスされることにより、前記被検出点に前記照明光の一部を入射させる請求項３に記載のグラビア印刷機用マークセンサ。   The light emitting element is attached at a position off the optical axis of the converging lens, and the light emitting area of the light emitting element is defocused on the printing substrate by the converging lens, so that the detected point is The gravure printing machine mark sensor according to claim 3, wherein a part of the illumination light is incident on the gravure printing machine. 前記実装基板の表面を基準として、前記発光素子の前記発光領域は、前記受光素子の前記受光点よりも高い位置に配置されている請求項４に記載のグラビア印刷機用マークセンサ。   5. The mark sensor for a gravure printing machine according to claim 4, wherein the light emitting region of the light emitting element is disposed at a position higher than the light receiving point of the light receiving element with respect to the surface of the mounting substrate. さらに、前記受光素子と前記収束レンズとの間の光軸上に配置され、前記発光素子から放射された照明光を、前記被検出点から前記受光点に向かう光の経路と重なり、かつ反対向きに伝搬させる分岐光学系を含む請求項３に記載のグラビア印刷機用マークセンサ。   Further, the illumination light, which is disposed on the optical axis between the light receiving element and the converging lens and radiated from the light emitting element, overlaps the light path from the detected point toward the light receiving point, and is in the opposite direction. The mark sensor for a gravure printing machine according to claim 3, comprising a branching optical system that propagates to the gravure printing machine.
JP2013083705A 2013-04-12 2013-04-12 Mark sensor for photogravure printing machine Pending JP2014206437A (en)

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