JP2010190821A - Device for inspecting quality of printed matter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for inspecting the quality of printed matter capable of properly confirming the state of the printed matter even if the printed matter has metal gloss. <P>SOLUTION: The device for inspecting the quality of the printed matter includes an illumination means 3 for irradiating the printed matter 1 with linear irradiation light, a photographing means 4 detecting the reflected light from the printed matter 1 irradiated with the irradiation light of the illumination means 3 to capture the image data of the printed matter 1, a reflector 5 reflecting the reflected light when the irradiation light from the illumination 3 is totally reflected by the metal gloss M of the printed matter 1 and a beam splitter 6 irradiating the printed matter 1 with the reflected light from the reflector 5 and transmitting the reflected light from the printed matter 1 through the photographing means 4. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a printed matter quality inspection apparatus that inspects the quality of a printed matter.

  In general, a predetermined quality position of a sheet-fed printing machine or the like is provided with a printed material quality inspection device that detects in-line abnormalities such as stains and color unevenness of a printed material on the impression cylinder immediately after the end of printing.

  As shown in FIG. 2, the printed matter quality inspection apparatus detects illumination light L arranged so as to illuminate the printed matter 1 on the impression cylinder 2, and reflected light reflected by the printed matter 1 by the irradiation light of the illuminating means L. The image capturing means S for capturing the image information in a straight line, the air ejection means (not shown) for pressing the printed material 1 against the impression cylinder 2, and the image information input from the image capturing means S are processed to inline the printed material 1 Image processing means (not shown) configured to inspect the abnormality.

  The photographing means S is composed of a CCD camera or the like, and the photographing direction of the photographing means S is arranged in a direction perpendicular to the printed material 1.

  The illuminating means L includes a light source and an ellipsoidal reflecting mirror having a predetermined curved surface, and the irradiation light generated by the light source is a straight line along the axial direction of the impression cylinder 2 by the reflecting surface of the ellipsoidal reflecting mirror. The light is condensed and irradiated. The illumination unit L irradiates the printed material 1 with the irradiation light at an angle of about 45 ° so as not to interfere with the shooting direction of the shooting unit S.

  The image processing means includes an A / D converter (not shown) that digitizes the image signal of the image information captured by the photographing means S, and a reference memory (not shown) that records a reference signal when the printed matter 1 is normal. ) And a CPU (not shown) for comparing the image signal from the A / D converter and the reference signal from the reference memory, and the CPU includes a pulse generator for detecting the rotation speed of the impression cylinder 2, a comparison result, etc. Display means for displaying the information and input means for inputting information such as the start of inspection are connected.

  When the printed material 1 is inspected by the printed material quality inspection device, the printed material 1 moving with the rotation of the impression cylinder 2 is photographed by the photographing means S to capture image information of the printed material 1, and an image signal of the captured image information is obtained. The image is sent to the CPU via the A / D converter, and the CPU detects the abnormality of the printed matter 1 by comparing the image signal of the image information with the reference signal of the reference memory (for example, see Patent Document 1).

JP 2004-136585 A

  However, when the printed matter 1 has a metallic luster M as shown in FIG. 2, the irradiation light from the illumination means L is totally reflected by the metallic luster M, and the light to the photographing means S is lost. There is a problem in that the portion becomes black and the state of the printed material 1 cannot be confirmed.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a printed matter quality inspection apparatus that can appropriately confirm the state of a printed matter even if the printed matter has a metallic luster.

  The present invention provides an illuminating unit that irradiates a printed product with line-shaped irradiation light, a photographing unit that detects reflected light reflected by the printed product by the irradiation light of the illuminating unit, and captures image information of the printed product, and the illumination A reflection plate that reflects the reflected light when the light emitted from the means is totally reflected by the metallic luster of the printed matter, and a beam that irradiates the printed matter with the reflected light from the reflecting plate and transmits the reflected light from the printed matter to the photographing means. The present invention relates to a printed material quality inspection apparatus including a splitter.

  In the present invention, the photographing means is disposed so that the photographing direction is substantially perpendicular to the printed material, and the reflecting plate is disposed so that the reflected light from the reflecting plate toward the beam splitter is substantially parallel to the printed material. preferable.

  In the present invention, the illuminating means is preferably arranged so that the irradiation light irradiates the printed matter at 30 ° or more and 60 ° or less, preferably 45 °.

  According to the present invention, even when the irradiation light is totally reflected by the metallic luster of the printed matter, the reflected light of the total reflection is reflected to the beam splitter by the reflecting plate, and then the reflected light from the reflecting plate is reflected by the beam splitter. The reflected light from the printed matter is transmitted to the photographing means, so that the state where the light to the photographing means disappears due to the total reflection of the irradiated light is surely prevented, and the state of the printed matter is appropriate even if there is a metallic luster. It is possible to obtain an excellent effect that can be confirmed.

It is a conceptual diagram which shows the example of embodiment of the printed matter quality inspection apparatus of this invention. It is a conceptual diagram which shows the state in which irradiation light totally reflects with the printed matter quality inspection apparatus of a prior art example.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an embodiment of a printed material quality inspection apparatus according to the present invention.

  The printed matter quality inspection apparatus according to the embodiment includes a lighting unit 3 arranged to illuminate the printed matter 1 on the impression cylinder 2 and a reflected light reflected by the printed matter 1 by irradiation light of the illuminating unit 3 to detect the printed matter 1. The image information in a straight line, the air ejection means (not shown) for pressing the printed material 1 against the impression cylinder 2, and the image information inputted from the photographing means 4 is processed to inline the printed material 1. An image processing means (not shown) configured to inspect the abnormality, and further, a reflecting plate 5 that receives the reflected light when the irradiation light is totally reflected on the printed matter 1, A beam splitter 6 that receives the reflected light and further reflects the reflected light to the printed matter 1 and transmits the reflected light from the printed matter 1 to the photographing means 4 is provided.

  The photographing means 4 is composed of one or a plurality of wide-angle CCD cameras 7, and the photographing direction of the photographing means 4 is arranged so as to be perpendicular to the printed material 1.

  The illuminating means 3 is composed of a light source 8 in which a plurality of white LEDs (light emitting diodes) are arranged in a straight line, and the irradiated light is irradiated at 30 ° or more and 60 ° or less, preferably 45 ° with respect to the printed matter 1. Are arranged to be. Here, if the illumination means 3 illuminates a predetermined range including the photographing range of the printed matter 1 on the line, the type of the light source 8 is not particularly limited, and a lens member such as a condensing lens or a reflection such as a concave mirror is used. A mirror may be provided. Further, when the light source 8 is an LED, it is preferable to use a light source having a directional characteristic so as to limit the spread of light to a certain range and having a high luminous intensity.

  The reflection plate 5 is disposed at a position where the photographing direction of the photographing unit 4 and other devices do not become an obstacle, and a position where the reflected light of the total reflection from the printed matter 1 is reflected to the beam splitter 6. The reflecting plate 5 is set at an angle at which the reflected light from the reflecting plate 5 toward the beam splitter 6 is parallel to the printed material 1. Here, the material and shape of the reflector 5 are not particularly limited.

  The beam splitter 6 is located at the intersection of the photographing direction of the photographing means 4 and the irradiation direction from the reflecting plate 5 and is inclined at about 45 ° downward with respect to the irradiation direction. It is configured to reflect the part downward and transmit light from below to the photographing means 4. Further, the type of the beam splitter 6 is not particularly limited.

  On the other hand, an image processing unit (not shown) of the image processing means has an A / D converter (not shown) for digitizing an image signal of image information captured by the photographing means 4 and the printed matter 1 is normal. A reference memory (not shown) for recording the reference signal and a CPU (not shown) for comparing the image signal from the A / D converter and the reference signal from the reference memory are provided. I have control.

  The operation of the embodiment implementing the printed material quality inspection apparatus of the present invention will be described below.

  When inspecting the printed material 1 with the printed material quality inspection device, the printed material 1 is pressed onto the impression cylinder 2 by blowing air from the air blowing means, and at the same time, the printed material 1 is irradiated with the irradiation light of the illuminating means 3 by the photographing means 4. The reflected light reflected at 1 is detected to capture image information of the printed material 1, and the image processing means detects the abnormality of the printed material 1 by comparing it with reference image information recorded in advance.

  At this time, when the printed matter 1 has a metallic luster M portion and the irradiation light from the illumination means 3 is totally reflected, the reflected light does not go directly to the photographing means 4, but the reflection plate 5 and the beam splitter 6. Going to the photographing means 4 through the printed matter 1. The reflection plate 5 reflects the reflected light toward the beam splitter 6 and substantially parallel to the printed material 1. Here, the metallic luster M of the printed material 1 may be aluminum, other metals, or metal compounds, and the metallic luster M may be produced by vapor deposition or other methods. The material and manufacturing method of the metallic luster M are not particularly limited. The total reflection is not limited to 100% reflection as long as the metallic luster M portion is in a black state by the photographing means 4 and the image processing means, and includes a reflection state of 90% or more. .

  Thus, according to the embodiment as described above, even when the irradiation light is totally reflected by the metallic luster M of the printed matter 1, the reflected light reflected by the reflection plate 5 is reflected to the beam splitter 6. Next, since the beam splitter 6 irradiates the printed matter 1 with the reflected light from the reflecting plate 5 and transmits the reflected light from the printed matter 1 to the photographing means 4, there is no light to the photographing means 4 due to total reflection of the irradiated light. Such a state can be surely prevented, and the state of the printed matter 1 can be appropriately confirmed even if the metallic luster M exists.

  In the embodiment, the photographing means 4 is arranged so that the photographing direction is substantially perpendicular to the printed matter 1, and the reflecting plate 5 has reflected light directed from the reflecting plate 5 toward the beam splitter 6 substantially parallel to the printed matter 1. In this arrangement, the reflecting plate 5 and the beam splitter 6 can be easily installed, and when the irradiation light is totally reflected by the metallic luster M of the printed matter 1, the photographing means 4 appropriately reflects the reflected light. Therefore, it is possible to more reliably prevent the state in which the light to the photographing unit 4 is lost due to the total reflection of the irradiation light, and the state of the printed matter 1 can be suitably confirmed even if the metallic luster M is present.

  In the embodiment, the illuminating means 3 is arranged so that the irradiated light irradiates the printed material 1 at 30 ° or more and 60 ° or less, preferably 45 °, even when there is total reflection due to the metallic luster M. The reflected light can be easily directed to the reflecting plate 5, the reflecting plate 5 and the beam splitter 6 can be easily installed, and the irradiation light is totally reflected by the metallic luster M of the printed material 1. Since the photographing means 4 appropriately captures the reflected light via the reflector 5 and the beam splitter 6, it is possible to more reliably prevent the state where the light to the photographing means 4 is lost due to the total reflection of the irradiation light, and the metallic luster M Even if there is, the state of the printed matter 1 can be suitably confirmed. Furthermore, when the illumination unit 3 is arranged so that the irradiation light is irradiated at 30 ° or more and 60 ° or less with respect to the printed matter 1, the reflector 5 and the beam splitter 6 can be more easily installed, and the irradiation light Is totally reflected by the metallic luster M of the printed matter 1, the photographing means 4 can preferably capture the reflected light via the reflector 5 and the beam splitter 6. When the illuminating means 3 is arranged so that the irradiated light is irradiated at 45 ° to the printed matter 1, the reflector 5 and the beam splitter 6 can be installed very easily, and the irradiated light is a metal of the printed matter 1. In the case of total reflection due to the gloss M, the photographing means 4 can optimally capture the reflected light from the reflecting plate 5 via the beam splitter 6. Here, when the illumination unit 3 is arranged so that the irradiation light irradiates the printed material 1 at an angle of less than 30 °, the position of the reflection plate 5 becomes low, and the installation of the reflection plate 5 and the beam splitter 6 becomes difficult. When the illumination unit 3 is arranged so that the irradiation light irradiates the printed matter 1 at an angle larger than 60 °, the reflector 5 and the beam splitter 6 are close to the imaging direction of the imaging unit 4. There is a problem that it is difficult to install the reflector 5 and the beam splitter 6.

  The printed material quality inspection apparatus according to the present invention is not limited to the above configuration, and the printed material does not move on an arc-like surface like an impression cylinder, but moves on a flat surface like a belt conveyor. However, it goes without saying that various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Printed material 3 Illumination means 4 Imaging means 5 Reflector 6 Beam splitter M Metal luster

Claims (3)

  Illuminating means for irradiating the printed material with line-shaped irradiation light, imaging means for detecting reflected light reflected by the printed material by the illuminating light of the illuminating device and capturing image information of the printed material, and irradiation from the illuminating device A reflection plate that reflects reflected light when the light is totally reflected by the metallic luster of the printed material, and a beam splitter that irradiates the printed material with the reflected light from the reflecting plate and transmits the reflected light from the printed material to the photographing means. Printed quality inspection apparatus characterized by the above.   The photographing means is disposed so that a photographing direction is substantially perpendicular to the printed material, and the reflecting plate is disposed so that reflected light from the reflecting plate toward the beam splitter is substantially parallel to the printed material. Item 2. A printed matter quality inspection apparatus according to item 1.   3. The printed matter quality inspection apparatus according to claim 1, wherein the illuminating unit is arranged so that the irradiation light irradiates the printed matter at 30 ° or more and 60 ° or less, preferably 45 °.

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