JP2014013152A - Printed matter monitoring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printed matter monitoring system which can monitor a coating state of a printed matter having coating of a transparent member such as vanish.SOLUTION: A printed matter monitoring system 1 comprises: a lighting unit for vanish monitoring 20 provided with an LED group 22 arranged parallel to a surface of a printed matter 2; and a camera 40 in which a lens 41 whose optical axis is an axis vertical to the surface of the printed matter 2 is inserted to a central opening of the lighting unit for vanish monitoring 20. When transparent member coating of the printed matter 2 is monitored, light beams from the LED group 22 of the lighting unit for vanish monitoring 20 are applied in a predetermined directivity to the surface of the printed matter 2. Most of normal reflected light beams from the printed matter 2 are not taken into the lens 41. This is because the lens 41 is provided at the center of the lighting unit for vanish monitoring 20 and the LED group 22 exists around it so that the normal reflected light beams from the transparent member in a camera view area on the printed matter 2 become unlikely to be taken into the lens 41 and the normal reflected light beams can thereby be suppressed.

Description

  The present invention relates to a printed matter monitoring apparatus that monitors a printed matter coated with a transparent member.

  2. Description of the Related Art Conventionally, there is known an apparatus for monitoring the quality of a printed material by monitoring a printed pattern such as a character or a picture printed on a printed material, or monitoring a foreign matter attached to the printed material with a camera. The printed matter monitoring apparatus includes an illumination device that irradiates light on the surface of the printed matter on which characters or the like are printed, and a camera that images the printed matter. In order to automatically inspect the quality of the printed matter, The image processing apparatus is configured to inspect whether or not the printed pattern is printed at a predetermined position on the printed material based on the image captured by the camera. According to this printed matter monitoring apparatus, it is possible to monitor the surface state of a printed matter during a printing operation using a camera installed in the final printing process.

  For example, there is known a printed matter monitoring apparatus that inspects a character (embossed character) obtained by embossing a printed matter (see Patent Document 1). This printed matter monitoring apparatus arranges a camera at a predetermined inclination angle with respect to a printed matter covered with a coating layer, and on the optical path at an incident angle so that the irradiated light is totally reflected on the coating layer on the printed matter. The illumination device is arranged in the vicinity of the. As a result, light other than the embossed characters is totally reflected on the coating layer to form a high-luminance white image, and the embossed character portions are diffusely reflected to form a low-luminance black dot image. Can be reliably identified.

  There is also known a printed matter monitoring device that inspects irregularities due to wrinkles on the surface of a printed matter, adhesion of foreign matters, and the like (see Patent Document 2). In this printed matter monitoring apparatus, a one-dimensional CCD camera and an illumination device are arranged at a predetermined inclination angle with respect to the surface of the printed matter, and a two-dimensional image is generated from the one-dimensional image captured by the one-dimensional CCD camera. When a linear dark spot is detected in the two-dimensional image, the unevenness of the printed matter is determined.

  By using such a printed matter monitoring apparatus, it is possible to inspect and monitor the surface state of the printed matter by imaging a printed pattern such as characters printed on the printed matter or foreign matter attached to the printed matter with a camera.

JP 2004-117239 A JP 2009-270888 A

  By the way, when the printed matter is a poster or the like, for the purpose of increasing its strength, a processing process may be applied to a part of the surface of the printed matter such as coating a transparent member such as varnish. For example, by applying PP to the printed material, the strength of the printed material can be increased, the gloss of the surface of the printed material can be increased, and the water resistance can be improved. PP processing is a processing method in which the surface of a printed material is vinyl-coated. Further, by subjecting the printed matter to matt varnishing, gloss can be suppressed as compared with PP processing, and a texture with suppressed surface gloss can be obtained. The overprint varnish is a kind of member used for mat varnish processing, and can give gloss to printed matter or improve the friction resistance by protecting the surface.

  In order to monitor the printed matter coated with such a transparent member such as varnish, it is assumed that the above-described printed matter monitoring apparatus is used. However, since the varnish applied to the printed material is transparent and is different from the printed pattern such as characters, the above-mentioned printed material monitoring device is certain about the coating state of the transparent member such as the varnish applied to the printed material. There was a problem that it was not always possible to monitor. This is because the camera is affected by strong specularly reflected light reflected by a transparent member such as varnish coated on the printed matter.

  In general, when a printed matter is irradiated with light from an illumination device, regular reflected light and diffused light are generated from the printed matter as reflected light. A person can recognize the color of characters or the like printed on the printed material by the diffused light from the printed material, but cannot recognize the color of characters or the like when the regular reflection light from the printed material is strong. This is the principle by which the color of the substance is generated. For example, when light is applied to a printed matter having a low gloss surface, specular reflection light becomes weak and diffuse light becomes strong. For this reason, the camera can capture the diffused light from the printed material and image the printing state of characters and the like on the printed material. On the other hand, when light is irradiated to a printed matter having a high gloss surface, specular reflection light becomes strong and diffused light becomes weak. For this reason, the camera cannot capture an image of a print state of characters or the like on the printed material.

  On the other hand, since the surface of a printed matter coated with varnish or the like is highly glossy, regular reflection light becomes stronger when irradiated with light. For this reason, the camera captures strong specularly reflected light from the printed matter and is affected by it, and may not be able to image the coating state such as varnish. Therefore, in the conventional printed matter monitoring apparatus, it is not always possible to image the coated state of the printed matter coated with a transparent member such as varnish, and the operator who performs the work in the printing process is The state cannot be confirmed accurately. As a result, the printed material is overlooked in the coating position on the product, coating unevenness, etc., and becomes a defective product.

  Therefore, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a printed matter monitoring apparatus capable of monitoring the application state of a printed matter on which a transparent member such as a varnish is applied. There is.

  In order to achieve the above object, a printed matter monitoring apparatus according to the present invention is directed to a printed matter monitoring apparatus that irradiates light from a lighting device to a monitored printed matter and images the printed matter by reflected light of the printed matter, and faces the surface of the printed matter. A first illumination device comprising a plurality of LEDs on a substrate around the round hole, and a round hole provided in the first illumination device. A lens is arranged on the first illuminating device, and the light from the plurality of LEDs provided in the first illumination device is irradiated onto the printed matter, and the reflected light from the printed matter is taken into the lens, and the transparent member applied to the printed matter is applied. And an image pickup device for picking up the work state.

  In the printed matter monitoring apparatus according to the present invention, the substrate provided in the first lighting device is disposed so as to face the surface of the printed matter, and the surface of the substrate is parallel to the surface of the printed matter, The lens is arranged so that an imaging angle by the imaging device is perpendicular to the printed matter.

  Further, the printed matter monitoring apparatus according to the present invention further opposes the surface of the substrate and the surface of the printed matter provided in the first illumination device between the first lighting device and the printed matter, and at the center. A polarizing plate provided with a round hole is provided, and the imaging device diffuses light of the plurality of LEDs provided in the first illumination device by the polarizing plate and is applied to the printed material, and is reflected from the printed material. Light is taken into the lens through a round hole provided in the polarizing plate, and the coated state of the transparent member coated on the printed matter is imaged.

  The printed matter monitoring apparatus according to the present invention further includes a second illumination device that is provided at a predetermined inclination angle with respect to the surface of the printed matter and includes a plurality of LEDs, and the imaging device includes the printed matter. When imaging the coated state of the transparent member coated on the surface, the light of a plurality of LEDs provided in the first illumination device is irradiated, the reflected light from the printed material is taken into the lens, and printed on the printed material When imaging the printed state of the printed pattern, the light of a plurality of LEDs provided in the second illumination device is irradiated, and reflected light from the printed matter is taken into the lens.

  The printed matter monitoring apparatus according to the present invention is further provided in a second illumination device provided with a plurality of LEDs, provided at a position of a predetermined inclination angle with respect to the surface of the printed matter, and the first illumination device. A plurality of LEDs provided, and a dimming unit that adjusts the illuminance of light emitted by the plurality of LEDs provided in the second lighting device, respectively, and the imaging device includes the plurality of LEDs provided in the first lighting device. The light of the LED, the light of which the illuminance is adjusted by the dimming means is irradiated to the printed matter, and the light of the plurality of LEDs provided in the second lighting device, the dimming means Light with adjusted illuminance is irradiated onto the printed matter, reflected light from the printed matter is taken into the lens, and the coated state of the transparent member coated on the printed matter is imaged.

  As described above, according to the present invention, light is emitted from the first illumination device to a printed material on which a transparent member such as varnish is applied, and the camera captures reflected light from the printed material so that the application state of the printed material is changed. The first lighting device, the printed material, and the camera were arranged so as to suppress the specular reflection light captured by the camera when taking an image. As a result, the camera captures specularly reflected light that has been moderately attenuated, so that the coating state of a transparent member such as varnish can be monitored.

1 is an overall configuration diagram illustrating an outline of a printed matter monitoring system including a printed matter monitoring apparatus according to an embodiment of the present invention. 1 is a perspective view illustrating a configuration of a printed matter monitoring apparatus according to Embodiment 1. FIG. It is a front view which shows the structure of the printed matter monitoring apparatus by Example 1. FIG. It is sectional drawing A which shows the structure of the printed matter monitoring apparatus by Example 1. FIG. It is a figure which shows the structure of the illumination unit for varnish monitoring. It is a figure which shows the structure of a normal printing monitoring illumination unit. FIG. 3 is a cross-sectional view B illustrating the configuration of the printed matter monitoring apparatus according to the first embodiment. FIG. 3 is a diagram illustrating an example of a size or the like of a printed matter monitoring apparatus according to a first embodiment. It is sectional drawing A which shows the structure of the printed matter monitoring apparatus by Example 2. FIG. It is a figure which shows the structure of a polarizing plate and a polarizing plate support member. It is a figure explaining an example of the character on a printed matter, and a transparent member.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The present invention provides a printed matter monitoring apparatus in which an illumination device irradiates light on a printed matter, a camera takes in reflected light from the printed matter, and images the surface state of the printed matter, and suppresses regular reflected light from the printed matter that is taken in by the camera. The coating state of a transparent member such as a coated varnish is monitored.

  The printed matter monitoring apparatus according to the first embodiment includes an illuminating device including an LED (Light Emitting Diode) group arranged in parallel with the printed matter, and a camera arranged at the center of the illuminating device (center of the LED group). It is characterized by being configured. Thereby, the monitoring environment which suppresses the regular reflection light which a camera takes in is realizable. In addition to the configuration of the first embodiment, the printed matter monitoring apparatus of the second embodiment further includes a polarizing plate that diffuses light from the illumination device between the illumination device and the printed matter. Thereby, it is possible to realize a monitoring environment that reliably suppresses regular reflection light captured by the camera. In addition, the printed matter monitoring apparatus according to the first and second embodiments is further characterized by using another illumination device including a group of LEDs arranged at a predetermined inclination angle with respect to the printed matter. The above-described lighting device is a device for monitoring the transparent member applied to the printed material, and the other lighting device is a device for monitoring a printed pattern such as a character printed on the printed material. Thus, by switching between the above-described illumination device and another illumination device, the monitoring of the transparent member and the monitoring of the print pattern can be combined with one printed matter monitoring device. Further, by simultaneously using the above-described lighting device and another lighting device, it is possible to simultaneously realize the monitoring of the transparent member and the monitoring of the printed pattern.

[Printed material monitoring system]
First, an outline of a printed matter monitoring system including a printed matter monitoring apparatus according to an embodiment of the present invention will be described. FIG. 1 is an overall configuration diagram illustrating an outline of the printed matter monitoring system. This printed matter monitoring system moves a printed matter monitoring device 1 that monitors a printed matter 2 coated with a transparent member such as varnish, a roll unit 3 that supports the printed matter 2 to be monitored, and the printed matter monitoring device 1 in a predetermined direction. The traverse unit 4 and a display device (not shown) for displaying the application state of the transparent member applied to the printed matter 2 on the screen are configured.

  The printed matter monitoring apparatus 1 moves in the longitudinal direction of the traverse unit 4 in a state of facing the surface of the printed matter 2 by driving a motor provided in the traverse unit 4, and applies the transparent member applied to the printed matter 2. The construction state is imaged, and the captured image is transmitted to a display device (not shown). The operator can check the coating state of the transparent member on the printed matter 2 displayed on the display device (not shown) by checking the coating state, and the transparent member is placed at a predetermined position on the printed matter 2. It can be determined whether the coating is applied or the coating state is normal.

  FIG. 11 is a diagram illustrating an example of characters on the printed material 2 and a transparent member. As shown in FIG. 11, a varnish 6, which is a transparent member, is coated on a printed material 2 that is a monitoring target of the printed material monitoring system so as to cover a character 5 printed on the surface thereof. The printed matter monitoring apparatus 1 of the printed matter monitoring system shown in FIG. 1 images the printed matter 2 including the varnish 6 that is a transparent member, and an area where the varnish 6 is applied (area surrounded by a dotted line) and the varnish 6 An image that can be distinguished from an uncoated region is displayed on the display device.

  Hereinafter, the details of the printed matter monitoring apparatus 1 shown in FIG.

[Example 1]
First, the printed matter monitoring apparatus 1 according to the first embodiment will be described. As described above, the printed matter monitoring apparatus 1 according to the first embodiment is configured to include an illuminating device including a group of LEDs arranged in parallel to the monitored printed matter 2 and a camera arranged at the center of the illuminating device. And

  FIG. 2 is a perspective view illustrating a configuration of the printed matter monitoring apparatus 1 according to the first embodiment. As shown in FIGS. 4 and 7 to be described later, the printed matter monitoring apparatus 1 includes a lighting unit 20 for varnish monitoring and lighting units 30-1 to 30-4 for normal printing monitoring (shown in FIG. 2). Only the normal print monitoring illumination units 30-1 and 30-4 are shown.), And a camera 40 (not shown) as an imaging device. Note that the configurations of the varnish monitoring illumination unit 20 and the normal printing monitoring illumination units 30-1 and 30-4 in FIG. 2 are schematically shown, and detailed components and the like are omitted. The varnish monitoring illumination unit 20 is an illuminating device that irradiates the printed matter 2 with light in order to monitor the varnish 6 that is a transparent member on the printed matter 2 shown in FIG. The normal printing monitoring illumination units 30-1 to 30-4 are illumination devices that irradiate the printed matter 2 with light in order to monitor the character 5 on the printed matter 2 shown in FIG. When monitoring a transparent member such as the varnish 6, the varnish monitoring illumination unit 20 is used, and the normal printing monitoring illumination units 30-1 to 30-4 are not used. On the other hand, when the print pattern such as the character 5 and the picture is monitored, the normal print monitoring illumination units 30-1 to 30-4 are used, and the varnish monitoring illumination unit 20 is not used. Whether to monitor the transparent member such as the varnish 6 or the printed pattern such as the character 5 is set by a changeover switch (not shown), and the varnish monitoring illumination unit 20 or the normal printing monitoring illumination is selected according to the setting. Light is irradiated to the printed matter 2 from the units 30-1 to 30-4.

  The illumination unit accommodation unit 11 accommodates a varnish monitoring illumination unit 20 and normal printing monitoring illumination units 30-1 to 30-4. The camera accommodation unit 12 includes a camera 40 (not shown), which will be described later. Is housed. As shown in FIG. 1, the printed material 2 (not shown) is disposed to face the front surface of the printed material monitoring device 1 (the surface having the opening of the illumination unit housing portion 11). In addition, the illumination unit accommodating portion 11 is a space for irradiating the printed matter 2 with light from the illumination unit 20 for varnish monitoring or the illumination units 30-1 to 30-4 for normal printing and capturing reflected light from the printed matter 2. Is secured.

  The varnish monitoring illumination unit 20 accommodated in the illumination unit accommodation portion 11 is disposed at a position close to the camera accommodation portion 12. In addition, the normal printing monitoring illumination units 30-1 to 30-4 are arranged on the four side surfaces of the illumination unit housing portion 11 and are connected to the connection members 31-1 to 31-1 at positions close to the front surface of the illumination unit housing portion 11. 31-8 (only the connection members 31-3 to 31-6 are shown in FIG. 2) and fixed at a predetermined inclination angle.

  FIG. 3 is a front view illustrating the configuration of the printed matter monitoring apparatus 1 according to the first embodiment, and is an external view of the printed matter monitoring apparatus 1 illustrated in FIGS. 1 and 2 when viewed from the opposite printed matter 2. As shown in FIG. 3, the lighting unit housing portion 11 includes the normal printing monitoring lighting units 30-1 to 30-1 fixed to the four side surfaces of the lighting unit housing portion 11 by connection members 31-1 to 31-8. 30-4 and the illumination unit 20 for varnish monitoring arrange | positioned in the back | inner side (side near the camera accommodating part 12) of the said illumination unit accommodating part 11 are accommodated. The varnish monitoring lighting unit 20 is formed in a quadrangle (here, approximately square) when viewed from the front (printed material 2) as shown in FIGS. The LED group is provided around the hole, and the lens 41 of the camera 40 is inserted into the hole. The reason why the varnish monitoring illumination unit 20 is rectangular is that the area of light irradiated by the varnish monitoring illumination unit 20 is rectangular, and is an image area of the printed matter 2 that is imaged by the imaging element 43 described later. This is because the camera field of view is a quadrangle and corresponds to this.

  FIG. 4 is a cross-sectional view A showing the configuration of the printed matter monitoring apparatus 1 according to the first embodiment. The printed matter monitoring apparatus 1 shown in FIGS. 1 and 2 has an appearance when viewed from the direction A shown in FIG. FIG. As shown in FIG. 4, the illumination unit accommodating portion 11 includes a varnish monitoring illumination unit 20 disposed on the camera accommodating portion 12 side, a printed member 2 side, and connection members 31-1 to 31-8 ( In FIG. 4, only the connection members 31-1 to 31-3 and 31-8 are shown. Only the normal print monitoring illumination units 30-1, 30-2, 30-4 are shown.).

  The varnish monitoring illumination unit 20 is disposed so as to face the surface of the printed matter 2 and to have its surface parallel to the surface of the printed matter 2. Further, as described above, a round hole corresponding to the lens 41 of the camera 40 is provided in the center of the varnish monitoring illumination unit 20, and an LED group 22 described later is provided at the position of the round hole. The LED group 22 is provided on the entire surface of the round hole. The normal printing monitoring illumination units 30-1 to 30-4 are obliquely attached to the housing on the side surface of the illumination unit housing 11 at a predetermined inclination angle, and the normal printing monitoring illumination unit 30-1 is provided. The light 2 through the LED group 32 (described later) is irradiated onto the printed matter 2.

  A camera 40 is accommodated in the camera accommodating portion 12. The camera 40 includes a lens 41 and a camera body 42, and the tip of the lens 41 is inserted into a central hole of the varnish monitoring illumination unit 20 disposed in the illumination unit housing portion 11 through the front surface of the camera housing portion 12. Has been inserted (see FIG. 3). The lens 41 is arranged so that the imaging angle of the camera 40 is perpendicular to the printed material 2, that is, the optical axis of the lens 41 is perpendicular to the surface of the printed material 2.

  FIG. 5 is a diagram illustrating a configuration of the varnish monitoring illumination unit 20 illustrated in FIG. 4. An LED group 22 composed of a plurality of LEDs is provided on an LED substrate 23 on the front surface of the varnish monitoring lighting unit 20 (the surface facing the surface of the printed matter 2). In other words, the surface of the LED substrate 23 and the surface of the LED group 22 (irradiation surface to the printed material 2) face the surface of the printed material 2 in parallel. Further, a connecting member 21-1 for fixing the varnish monitoring illumination unit 20 to the housing of the illumination unit housing portion 11 on the camera housing portion 12 side is provided at predetermined positions on the four corners of the varnish monitoring lighting unit 20. , 21-2, etc. are provided. The LED board 23 of the varnish monitoring lighting unit 20 and the housing of the lighting unit housing portion 11 are connected by the connecting members 21-1, 21-2, etc., so that the varnish monitoring lighting unit 20 is housed in the lighting unit. It is fixedly arranged inside the part 11.

  FIG. 6 is a diagram illustrating a configuration of the normal print monitoring illumination unit 30-4 illustrated in FIG. The normal print monitoring illumination units 30-1 to 30-3 are configured similarly. An LED group 32 composed of a plurality of LEDs is provided on an LED substrate 33 on the front surface (surface in the direction in which the printed matter 2 is arranged) of the normal print monitoring illumination unit 30-4. In addition, a plurality of connection members 35 for fixing the normal printing monitoring illumination unit 30-4 to the casing on the side surface of the lighting unit housing portion 11 are provided at predetermined positions of the normal printing monitoring illumination unit 30-4. A normal print monitoring illumination unit support member 34 is provided. The normal printing monitoring illumination unit support member 34 is configured to have a U-shape with two plates bent at a predetermined angle, and one of the plates and the normal printing monitoring illumination unit 30-4. The LED substrate 33 is connected by a plurality of connection members 35, and the other plate and the casing on the side surface of the illumination unit housing portion 11 are connected by a connection member 31-8 or the like. Accordingly, the normal print monitoring illumination unit 30-4 is fixedly arranged inside the illumination unit housing portion 11, and is attached to the housing on the side surface of the illumination unit housing portion 11 at a predetermined inclination angle. The printed material 2 is irradiated with light from the LED group 32 of the illumination unit 30-4.

  FIG. 7 is a cross-sectional view B showing the configuration of the printed matter monitoring apparatus 1 according to the first embodiment. The printed matter monitoring apparatus 1 shown in FIGS. 1 and 2 has an appearance when viewed from the direction B shown in FIG. FIG. FIG. 8 is a diagram illustrating an example of the size and the like of the printed matter monitoring apparatus 1 according to the first embodiment. As shown in FIG. 7, the lighting unit housing 11 is disposed on the varnish monitoring lighting unit 20 disposed on the camera housing 12 side, and on the printed material 2 side that is the front side of the lighting unit housing 11. The normal printing monitoring illumination unit 30-fixed by the connection members 31-1 to 31-8 (only the connection members 31-1 and 31-6 to 31-8 are shown in FIG. 7). 1 to 30-4 (in FIG. 7, only the normal print monitoring illumination units 30-1, 30-3, and 30-4 are shown).

  Since the varnish monitoring illumination unit 20, the normal printing monitoring illumination units 30-1 to 30-4, the camera 40, the lens 41, the camera body 42, and the camera housing portion 12 have already been described with reference to FIG. To do. Note that α in the printed material 2 indicates a camera field of view on the printed material 2 captured by the imaging element 43 provided in the camera body 42.

  As shown in FIG. 8, the apparatus width W indicates the length of one side on the front surface of the printed matter monitoring apparatus 1 facing the surface of the printed matter 2, that is, the vertical and horizontal widths of the illumination unit accommodating portion 11. 300 mm. The apparatus depth D indicates the depth of the printed matter monitoring apparatus 1 including the illumination unit accommodation unit 11 and the camera accommodation unit 12, and the size thereof is 465 mm. The camera visual field width CW indicates the width of the camera visual field region (α) on the printed matter 2 imaged by the imaging device 43 provided in the camera body 42, and the size thereof is 151 mm. The shooting distance l indicates the distance from the tip of the lens 41 to the printed material 2 (α), and the distance is 200 mm. The directivity angle of each LED in the LED group 22 and the LED group 32 provided in the varnish monitoring lighting unit 20 and the normal printing monitoring lighting units 30-1 to 30-4 used in this case is preferably 15 °. .

  As described above, when the application state of the transparent member such as the varnish 6 is monitored, the light from the varnish monitoring illumination unit 20 is irradiated onto the printed matter 2, and the reflected light from the printed matter 2 is applied to the varnish monitoring illumination unit 20. It is directly taken into the camera 40 provided in the center. When the printing state of a printed pattern such as the character 5 is monitored, light from the normal print monitoring illumination units 30-1 to 30-4 is irradiated to the printed matter 2, and reflected light from the printed matter 2 is used for varnish monitoring. It is taken directly into the camera 40 provided in the center of the lighting unit 20.

  Further, by reducing the directivity angle of each LED in the varnish monitoring illumination unit 20, that is, by using an LED having a narrow light directivity, the photographing distance l can be increased, and the printed matter 2 is imaged. Therefore, the printed matter 2 can be irradiated with light having an illuminance necessary for monitoring. Thus, in addition to the varnish monitoring illumination unit 20, the normal printing monitoring illumination units 30-1 to 30-4 can also be arranged inside the illumination unit housing 11, so that a transparent member such as varnish 6 can be applied. It is possible to realize the printed matter monitoring apparatus 1 that combines the monitoring of the state and the monitoring of the printing state of the printed pattern such as the character 5 and the picture.

  As described above, according to the printed matter monitoring apparatus 1 of the first embodiment, the varnish monitoring illumination unit 20 provided with the LED group 22 arranged in parallel to the surface of the printed matter 2 and the center of the varnish monitoring illumination unit 20 are provided. A hole 41 is provided, and a lens 41 having an axis perpendicular to the surface of the printed matter 2 as an optical axis is provided with a camera 40 inserted into the hole. And when monitoring transparent members, such as varnish 6 coated on printed matter 2, the light from LED group 22 provided in the front of lighting unit 20 for varnish monitoring is the space inside lighting unit accommodating part 11. Then, the surface of the printed matter 2 is irradiated with a predetermined directivity.

  In this case, most of the regular reflection light from the transparent member in the camera visual field area on the printed matter 2 irradiated with the light is not captured by the lens 41. This is because a lens 41 is provided at the center of the varnish monitoring illumination unit 20 and the LED group 22 exists around the lens 41, so that the light from the LED group 22 is irradiated onto the printed material 2, and the camera on the printed material 2. This is because the specularly reflected light from the transparent member in the visual field region is not easily captured by the lens 41, and the specularly reflected light can be suppressed.

  Thereby, since the camera 40 does not receive the influence of the strong regular reflection light from the transparent member on the printed matter 2, the surface on which the transparent member is coated can be raised, and the coating state of the transparent member can be changed. An image can be taken. Therefore, the coating state of the transparent member can be constantly monitored, and it is possible to immediately determine whether the transparent member is misaligned or uneven. Then, by dealing with such defects of the printed matter 2, it is possible to eliminate the waste of the printed matter 2 and realize efficient production of the printed matter 2.

  Further, in the above-mentioned Patent Documents 1 and 2, since the camera is arranged at a predetermined inclination angle with respect to the printed matter, the distance to the camera differs depending on the location in the camera viewing area, and the focal length is It will be different. For this reason, when the entire captured image is generated, a place where the focus is achieved and a place where the focus is not achieved, the focus cannot be achieved with respect to the entire camera field of view, and as a result, the printed matter can be monitored with high accuracy. Can not. On the other hand, according to the printed matter monitoring apparatus 1 of the first embodiment, the imaging angle of the camera 40 is perpendicular to the printed matter 2, that is, the optical axis of the lens 41 in the camera 40 is relative to the surface of the printed matter 2. The lens 41 is arranged so as to be vertical. Thereby, since the camera 40 images the surface of the printed matter 2 from the vertical direction, the focal length is uniform over the entire camera visual field region, and there is no problem that the focal point differs depending on the location. Therefore, the coating state of the transparent member in the camera viewing area on the printed matter 2 can be imaged with high accuracy.

  Further, according to the printed matter monitoring apparatus 1 of the first embodiment, the normal printing monitoring illumination units 30-1 to 30-4 in which the LED group 32 is provided at a predetermined inclination angle with respect to the printed matter 2, and the printed matter 2 The camera 40 is configured to have an optical axis that is an axis perpendicular to the surface. And about the printed matter 2 with which transparent members, such as varnish 6, are not coated, when monitoring printed patterns, such as the character 5 printed on the printed matter 2, the normal printing monitoring illumination units 30-1 to 30-4 are used. The light from the LED group 32 provided on the front surface of the print is irradiated onto the surface of the printed matter 2 with a predetermined directivity. Then, the reflected light from the printed material 2 is taken into the camera 40 by the lens 41. Thereby, the camera 40 can take in the diffused light from the printed matter 2, and can image the printing state of the printed pattern such as the character 5 and the pattern as in the conventional technique.

  Moreover, according to the printed matter monitoring apparatus 1 of Example 1, when monitoring the printed matter 2 coated with a transparent member such as the varnish 6, only the varnish monitoring illumination unit 20 is used, and the transparent varnish 6 or the like is used. When monitoring the printed matter 2 on which a printed pattern 2 such as a character 5 or a pattern is printed, only the normal print monitoring illumination units 30-1 to 30-4 are used. I tried to do it. As a result, it is possible to realize the printed matter monitoring apparatus 1 that can be used for both monitoring the coating state of the transparent member and monitoring the printing state of the printed pattern such as the character 5 and the picture. Note that it is not possible to monitor the printed matter 2 coated with the transparent member using only the normal print monitoring illumination units 30-1 to 30-4. This is because the lens 41 of the camera 40 faces the printed matter 2, and the normal print monitoring illumination units 30-1 to 30-4 are arranged at a predetermined inclination angle with respect to the printed matter 2. This is because the specularly reflected light that is captured is extremely attenuated.

[Example 2]
Next, the printed matter monitoring apparatus 1 according to the second embodiment will be described. As described above, the printed matter monitoring apparatus 1 of the second embodiment further diffuses light from the varnish monitoring illumination unit 20 between the varnish monitoring illumination unit 20 and the printed matter 2 in addition to the configuration of the first embodiment. A polarizing plate is provided. For example, when the reflectance of the transparent member coated on the printed matter 2 is high, the camera 40 takes in excessive regular reflection light in the printed matter monitoring apparatus 1 of the first embodiment, and the coating state of the transparent member is accurately determined. It may not be possible to monitor. In Example 2, by providing a polarizing plate, regular reflection light captured by the camera 40 can be reliably suppressed, and the coating state can be accurately monitored.

  FIG. 9 is a cross-sectional view A showing the configuration of the printed matter monitoring apparatus 1 according to the second embodiment, and is an external view when seen from the direction A shown in FIG. As shown in FIG. 9, the printed matter monitoring apparatus 1 according to the second embodiment includes a polarizing plate 50 and a polarizing plate support member 51 in addition to the configuration of the first embodiment. A polarizing plate support member 51 is accommodated.

  The polarizing plate 50 faces the surface of the varnish monitoring illumination unit 20 and the surface of the printed material 2, and the surface is the surface on which the LED group 22 of the varnish monitoring illumination unit 20 is provided (that is, the surface of the LED substrate 23). ) And parallel to the surface of the printed material 2. Although not shown in FIG. 9, a round hole corresponding to the lens 41 of the camera 40 is provided in the center of the polarizing plate 50. The round holes are sized so that the camera 40 can image the printed product 2 in the predetermined camera viewing area α so that the imaging of the camera viewing area α in the printed product 2 shown in FIG. The polarizing plate 50 has a function of diffusely reflecting and diffusing light from the varnish monitoring illumination unit 20.

  The polarizing plate support member 51 is disposed on the camera housing portion 12 side in the illumination unit housing portion 11 and has a rectangular parallelepiped shape. The bottom surface on the camera housing portion 12 side does not exist, and the printed material 2 side has a front surface. Only the edge for attaching the polarizing plate 50 is provided, and is arranged so as to be in contact with the four side surfaces of the illumination unit housing portion 11. A polarizing plate 50 is attached to the front edge of the polarizing plate support member 51.

  FIG. 10 is a diagram illustrating the configuration of the polarizing plate 50 and the polarizing plate support member 51 illustrated in FIG. 9. As illustrated in FIG. 10, the polarizing plate 50 and the polarizing plate support member 51 arranged at a predetermined position of the lighting unit housing portion 11 are connected by the connecting member 52, so that the polarizing plate 50 is housed in the lighting unit housing. It is fixedly arranged at a predetermined position inside the portion 11.

  Thus, the light from the varnish monitoring illumination unit 20 is diffused by the polarizing plate 50, and the light diffused by the polarizing plate 50 is irradiated to the printed material 2. Then, the reflected light from the printed material 2 passes through a round hole provided in the center of the polarizing plate 50 and is directly taken into the lens 41 inserted in the central round hole of the varnish monitoring illumination unit 20.

  As described above, according to the printed matter monitoring apparatus 1 of the second embodiment, in addition to the configuration of the first embodiment, the light from the varnish monitoring illumination unit 20 is further interposed between the varnish monitoring illumination unit 20 and the printed matter 2. And a polarizing plate 50 for diffusing the light. Thereby, there exists an effect similar to Example 1.

  When a transparent member such as varnish 6 coated on the printed material 2 is monitored, light from the LED group 22 provided on the front surface of the varnish monitoring illumination unit 20 is diffused by the polarizing plate 50 and diffused. The irradiated light is irradiated to the surface of the printed matter 2. In this case, since the diffused light from the polarizing plate 50 is irradiated on the camera viewing area on the printed matter 2, the transparent member in the camera viewing area on the printed matter 2 is compared with Example 1 in which the polarizing plate 50 is not provided. The regular reflection light from can be suppressed. As a result, the camera 40 can further reduce the influence of the strong specular reflection light from the transparent member on the printed matter 2 and take in the specular reflection light that has been moderately attenuated. It can be raised, and the coated state of the transparent member can be more reliably imaged. In particular, it is effective when the reflectance of the transparent member coated on the printed material 2 is high.

[Modifications of Examples 1 and 2]
Next, a printed matter monitoring apparatus 1 according to a modification of the first and second embodiments will be described. As described above, the printed matter monitoring apparatus 1 according to the modification of the first and second embodiments is characterized in that the varnish monitoring illumination unit 20 and the normal print monitoring illumination units 30-1 to 30-4 are used at the same time. In the printed matter monitoring apparatus 1 according to the first and second embodiments, the varnish monitoring lighting unit 20 and the normal printing monitoring lighting units 30-1 to 30-4 are switched, and the varnish monitoring lighting unit 20 is transparent. The coating state of the member is monitored, and when the normal printing monitoring illumination units 30-1 to 30-4 are used, the printing state of the printed pattern is monitored. In the modified examples of the first and second embodiments, the varnish monitoring illumination unit 20 and the normal printing monitoring illumination units 30-1 to 30-4 are simultaneously used without performing such switching, and the transparent member is applied. The monitoring of the status and the monitoring of the printing status of the printed pattern are realized at the same time.

  The printed matter monitoring apparatus 1 according to the modification of the first and second embodiments is a control for adjusting the illuminance of the light emitted by the LED group 22 of the varnish monitoring illumination unit 20 in addition to the configuration of the first or second embodiment. Light adjustment means is provided for adjusting the illuminance of the light irradiated by the LED group 32 of the light means and the normal print monitoring illumination units 30-1 to 30-4.

  As described above, according to the printed matter monitoring apparatus 1 of the modified example of the first and second embodiments, the varnish monitoring illumination unit 20 and the normal print monitoring illumination units 30-1 to 30-4 are used at the same time. However, the specular reflection light for monitoring the coating state of the transparent member can be moderately attenuated and diffused light for monitoring the printing state of the printed pattern can be taken in. Monitoring and monitoring of the print status of the printed pattern can be realized at the same time. Further, the operator irradiates the printed matter 2 from the varnish monitoring illumination unit 20 using the light control means of the varnish monitoring illumination unit 20 and the light control means of the normal print monitoring illumination units 30-1 to 30-4. By adjusting the illuminance of light and the illuminance of light irradiated to the printed material 2 from the illumination units 30-1 to 30-4 for normal printing monitoring, the coated state of the transparent member applied to the printed material 2 and the printed material 2 It is possible to monitor the printing state of the printed pattern printed on the screen in a state that is easy for the operator to see.

  Although the present invention has been described with reference to the first and second embodiments, the present invention is not limited to the first and second embodiments and can be variously modified without departing from the technical idea thereof. For example, as shown in FIG. 11, the transparent member on the printed material 2 may be a varnish that is coated around the printed material 2 and includes a printed pattern such as characters 5 and patterns. It may be a varnish or glue coated at a predetermined location.

  Further, the printed matter monitoring system shown in FIG. 1 is an example, and the printed matter monitoring apparatus 1 shown in FIG. 2 and the like is also an example, and the present invention is not limited to these configurations.

  In the first and second embodiments, the image of the printed material 2 captured by the camera 40 is displayed on the display device, and the operator confirms the coating state of the transparent member on the printed material 2 displayed on the display device. Explained. As another embodiment, the printed matter monitoring system further includes an image processing device, and the image processing device receives an image of the printed matter 2 captured by the camera 40, and based on the image, the application state of the transparent member May be automatically determined.

  Further, in order to arrange the varnish monitoring illumination unit 20, the normal printing monitoring illumination units 30-1 to 30-4 and the polarizing plate 50 at predetermined positions in the illumination unit housing portion 11, the connection members 21-1 and 31-are arranged. 1, 35, 52, the normal printing monitoring illumination unit support member 34, the polarizing plate support member 51, and the like are used, but other means may be used. In short, it is only necessary that the varnish monitoring illumination unit 20 and the like can be arranged and fixed at a predetermined position in the illumination unit housing portion 11.

  In the first and second embodiments, the imaging angle of the camera 40 is perpendicular to the printed matter 2, that is, the optical axis of the lens 41 in the camera 40 is perpendicular to the surface of the printed matter 2. The lens 41 is arranged. In the present invention, the lens 41 does not necessarily need to be arranged vertically, and is slightly inclined as long as the specular reflection light from the printed material 2 is suppressed and the transparent member coated with the printed material 2 can be monitored. It may be.

  As shown in FIG. 4, the lens 41 of the camera 40 is inserted into a round hole provided in the center of the varnish monitoring illumination unit 20, and the tip thereof is substantially aligned with the surface of the varnish monitoring illumination unit 20. Yes. In the present invention, the tip of the lens 41 is not necessarily aligned with the surface of the varnish monitoring illumination unit 20, and may be retracted to the camera housing 12 side or may be projected to the printed matter 2 side. In short, the tip of the lens 41 may be at a position where the predetermined camera field of view α shown in FIG. 7 can be secured in order for the camera 40 to capture an image of the printed matter 2.

DESCRIPTION OF SYMBOLS 1 Printed product monitoring apparatus 2 Printed product 3 Roll unit 4 Traverse unit 5 Character 6 Varnish 11 Illumination unit accommodating part 12 Camera accommodating part 20 Varnish monitoring illumination unit 21, 31, 35, 52 Connection member 22, 32 LED group 23, 33 LED board 30 Illumination unit for normal printing monitoring 34 Illumination unit support member for normal printing monitoring 40 Camera 41 Lens 42 Camera body 43 Imaging element 50 Polarizing plate 51 Polarizing plate supporting member

Claims (5)

In the printed matter monitoring apparatus that irradiates the printed matter to be monitored from the illumination device and images the printed matter by the reflected light of the printed matter,
A first lighting device comprising a substrate facing the surface of the printed matter, a round hole provided in the center of the substrate, and a plurality of LEDs on the substrate around the round hole;
A lens is disposed in a round hole provided in the first lighting device, and light of a plurality of LEDs provided in the first lighting device is irradiated onto the printed material, and reflected light from the printed material is taken into the lens. An imaging device for imaging the coating state of the transparent member coated on the printed matter;
A printed matter monitoring apparatus comprising: The printed matter monitoring apparatus according to claim 1,
The substrate provided in the first lighting device is disposed so as to face the surface of the printed matter and the surface of the substrate is parallel to the surface of the printed matter,
The printed matter monitoring apparatus, wherein the lens is arranged so that an imaging angle by the imaging device is perpendicular to the printed matter. In the printed matter monitoring apparatus according to claim 1 or 2,
Furthermore, a polarizing plate is provided between the first lighting device and the printed material, facing the surface of the substrate provided in the first lighting device and the surface of the printed material, and having a round hole in the center. ,
The imaging device
Light from a plurality of LEDs provided in the first illumination device is diffused by the polarizing plate and irradiated to the printed matter, and reflected light from the printed matter passes through a round hole provided in the polarizing plate. A printed matter monitoring apparatus that captures an image of a coated state of a transparent member that is taken into the lens and coated on the printed matter. In the printed matter monitoring apparatus according to any one of claims 1 to 3,
Furthermore, a second illumination device provided with a plurality of LEDs provided at a position of a predetermined inclination angle with respect to the surface of the printed matter,
The imaging device
When imaging the application state of the transparent member applied to the printed matter, the light of a plurality of LEDs provided in the first illumination device is irradiated, and the reflected light from the printed matter is taken into the lens,
When imaging the printing state of the printed pattern printed on the printed matter, the light of a plurality of LEDs provided in the second illumination device is irradiated, and reflected light from the printed matter is taken into the lens. Printed material monitoring device. In the printed matter monitoring apparatus according to any one of claims 1 to 3,
Furthermore, a second lighting device provided with a plurality of LEDs provided at a position of a predetermined inclination angle with respect to the surface of the printed matter, and
Dimming means for adjusting the illuminance of light emitted by the plurality of LEDs provided in the first lighting device and the plurality of LEDs provided in the second lighting device, respectively,
The imaging device
A plurality of LEDs provided in the first illumination device, the light having the illuminance adjusted by the dimming means irradiating the printed matter, and the plurality of LEDs provided in the second illumination device The light having the illuminance adjusted by the light control means is applied to the printed matter, the reflected light from the printed matter is taken into the lens, and the coating state of the transparent member applied to the printed matter is A printed matter monitoring apparatus, characterized in that imaging is performed.

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