JP2006123388A - 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 which can carry out pertinent inspection of the printed matter and best-suitably eliminate the possibilities that the leaping-up part of the printed matter might come into contact with the tip of an air jet means. <P>SOLUTION: This device for inspecting the quality of printed matter 1 comprises an illuminating means which illuminates the printed matter 1 prepared by a sheet printing device on an impression cylinder 2, a photographing means 4 which detects a reflected light generated by the printed matter 1 from an illuminating light of the illuminating means and loads image information of the printed matter 1, and the air jet means 15 which jets air to the impression cylinder 2. Thus the device inspects any abnormality of the printed matter 1 in-line based on the image information. The air jet means 15 is equipped with a first air jet part 17 which presses the printed matter 1 to the impression cylinder 2 in the manner that the printed matter 1 can be photographed and a second air jet part 19 which forms a pressing air layer A so as to prevent the printed matter 1 from leaping up. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a printed matter quality inspection apparatus that detects abnormalities such as stains and color unevenness in a printed matter.

  Generally, at a predetermined position of a sheet-fed printing machine or the like, a printed material quality inspection device that detects in-line abnormalities such as stains and color unevenness of a printed material on an impression cylinder immediately after the end of printing is provided (for example, Patent Document 1).

  As shown in FIGS. 7 to 9, the printed matter quality inspection apparatus detects illumination means 3 arranged to illuminate the printed matter 1 on the impression cylinder 2 and reflected light reflected by the printed matter 1 by illumination light of the illuminating means 3. Then, a photographing unit 4 that captures image information of the printed matter 1, an air ejection unit 5 that presses the printed matter 1 against the impression cylinder 2, and an image processing unit (not shown) that processes the image information input from the photographing unit 4. It has.

  The photographing means 4 is a single wide-angle CCD camera and is arranged so as to face the axis O of the impression cylinder 2 through a predetermined distance from the impression cylinder 2, and the photographing position P of the printed material 1 is the impression cylinder 2. And a range L of a predetermined length so as to correspond to the maximum width of the paper surface on the impression cylinder 2.

  The illumination unit 3 includes a white LED (light emitting diode) (not shown) as a light source and an elliptical reflecting mirror 6 having a predetermined curved surface. Irradiation light generated by the white LED is transmitted by the elliptical reflecting mirror 6. The light is condensed in a line shape along the axial direction of the impression cylinder 2 and irradiated to the photographing position P of the printed matter 1.

  The air ejecting means 5 is connected to the air blower 7, the air control unit 8 that controls and supplies the air from the air blower 7, and the air control unit 8 via the pipe 9 and extends in the axial direction of the impression cylinder 2. And a plurality of air nozzles 11 (eight in the figure) for ejecting air from the air ejection base 10 toward the printed matter 1, respectively, and an imaging range of the imaging unit 4 and an irradiation range of the illumination unit 3. It is arranged so as not to become an obstacle.

  An image processing unit (not shown) includes an A / D converter (not shown) for digitizing an image signal of image information captured by the photographing means 4 and a reference for recording a reference signal when the printed matter 1 is normal. A memory (not shown) 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, and the CPU controls the illumination means 3 and the air ejection means 5. I am doing so.

When inspecting the printed material 1 with the printed material quality inspection device, the printed material 1 whose front end is locked by the gripper 13 is pressed onto the impression cylinder 2 by blowing air from the air outlet 12 of the air nozzle 11. The photographing unit 4 detects reflected light reflected by the printed material 1 by the irradiation light of the illumination unit 3 to capture image information of the printed material 1 and sends an image signal of the image information to the CPU via the A / D converter. The CPU compares the image signal of the image information with the reference signal of the reference memory to detect the abnormality of the printed matter 1.
JP 2004-136585 A

  However, even if the printed matter 1 on the impression cylinder 2 is pressed by the gripper 13 and the air ejection means 5, when the printed matter 1 is released from the impression cylinder 2 and the blanket cylinder 14, Since the side jumps upward (the phantom line portion of the printed matter 1 in FIG. 9), there is a problem that the image of the printed matter 1 is shifted and the quality inspection of the printed matter 1 cannot be performed appropriately. In addition, there is a possibility that the part of the printed matter 1 that has jumped up contacts the tip of the air jetting means 5.

  The present invention has been made in view of the above circumstances, and a printed matter quality inspection apparatus that appropriately performs a quality inspection of a printed matter and appropriately prevents a possibility that a portion of the printed matter jumps up to contact the tip of the air ejection means. It is intended to provide.

  The present invention provides an illuminating unit that illuminates a printed material printed by a sheet-fed printer on an impression cylinder, and a photographing that detects reflected light reflected by the printed material by illumination light of the illuminating unit and captures image information of the printed material. And a print quality inspection apparatus that inspects abnormalities of the printed matter in-line based on the image information, the air jetting unit comprising: a means for ejecting air toward the impression cylinder; Printed material quality inspection apparatus comprising: a first air ejection portion for pressing the printed material onto the impression cylinder so as to be photographable; and a second air ejection portion for forming a pressed air layer so as to prevent the printed material from jumping up. , Related to

  In the present invention, the second air ejection portion may form an air ejection surface along the circumferential direction and the width direction of the impression cylinder.

  In the present invention, the air ejection surface of the second air ejection portion may be formed so as to extend from the first air ejection portion to the side opposite to the photographing position.

  In the present invention, the second air ejection portion may form a number of ejection holes on the air ejection surface.

  In the present invention, the second air ejection part may form a slit on the air ejection surface.

  In the present invention, the first air ejection part and the second air ejection part may be integrally formed.

  In the present invention, the first air ejection part may be configured to bring the pressing position of the air for pressing the printed material against the impression cylinder close to the photographing position of the printed material and to blow the air substantially perpendicularly to the printed material.

  Thus, according to the present invention, even when the printed matter is released from the impression cylinder and the bran cylinder, the printed matter is pressed onto the impression cylinder by the first air ejecting portion in a state where it can be photographed. Since the press air layer is formed by the second air ejecting portion to prevent the printed matter from jumping up, the printed image is properly inspected by suppressing the deviation of the printed matter image, and the printed portion of the printed matter is The possibility of contact with the tip can be suitably prevented.

  In the present invention, when the second air ejection portion forms an air ejection surface along the circumferential direction and the width direction (axial direction) of the impression cylinder, the surface of the pressure air layer is formed by forming the surface of the pressure air layer. Since the printed matter is prevented from jumping up, the image quality of the printed matter is more appropriately controlled by sufficiently suppressing the deviation of the printed matter image, and the possibility that the raised portion of the printed matter comes into contact with the tip of the air ejecting means is more suitable. Can be prevented.

  In the present invention, when the air ejection surface of the second air ejection section is formed to extend from the first air ejection section to the side opposite to the photographing position, the second air ejection section is ejected by the first air ejection section. The printed air is prevented from jumping up with the pressed air layer without affecting the air. The possibility of contact with the tip of the means can be more suitably prevented.

  In the present invention, when the second air ejection portion forms a large number of ejection holes on the air ejection surface, the air ejected from the numerous ejection holes is located between the air ejection surface and the printed matter and the escape space is limited. Therefore, a pressurization air layer is suitably formed, and as a result, the deviation of the image of the printed matter is sufficiently suppressed, and the quality inspection of the printed matter is performed more appropriately, and the part where the printed matter jumps up contacts the tip of the air ejection means. The fear can be prevented more suitably. In addition, a large number of ejection holes are formed on the air ejection surface, and the ejected air is located between the air ejection surface and the printed matter, and the escape space is limited. It can form suitably.

  In the present invention, when the second air ejection part forms a slit on the air ejection surface, the air ejected from the ejection hole of the slit is located between the air ejection surface and the printed matter, and the escape space is limited. The air layer is preferably formed, and as a result, the deviation of the image of the printed matter is sufficiently suppressed to perform the quality inspection of the printed matter more appropriately, and the portion where the printed matter jumps up may come into contact with the tip of the air ejection means. It can prevent more suitably. Moreover, since the ejection hole is formed by the slit, the manufacturing cost of the second air ejection portion can be reduced.

  In the present invention, when the first air ejection portion and the second air ejection portion are integrally formed, the relative position between the first air ejection portion and the second air ejection portion is always suitably maintained. Thus, it is possible to appropriately perform a quality inspection of the printed matter and to appropriately prevent a possibility that a portion where the printed matter jumps up contacts the tip of the air ejection unit. In addition, the manufacturing cost of the first air ejection part and the second air ejection part can be reduced, and the first air ejection part and the second air ejection part can be easily provided.

  In the present invention, the first air ejecting portion is configured to bring the pressing position of the air that presses the printed material against the impression cylinder close to the shooting position of the printed material and to blow the air substantially perpendicularly to the printed material. Since the printed matter is pressed onto the impression cylinder in a state where it can be photographed, the image quality of the printed matter can be more appropriately inspected by sufficiently suppressing the deviation of the image of the printed matter. Moreover, since the turbulent flow generated on the surface of the printed matter can be reduced by blowing the air substantially perpendicularly to the printed matter, the fluttering of the printed matter can be suppressed.

  According to the above-described printed material quality inspection apparatus of the present invention, it is excellent that the printed material can be appropriately inspected, and the possibility that the portion of the printed material that has jumped up can come into contact with the tip of the air ejection means can be suitably prevented. Can have an effect.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 to 3 show a first example of an embodiment of the present invention, and the same reference numerals as those in FIGS. 7 to 9 denote the same components.

  The printed quality inspection apparatus of the first example detects illumination means (not shown) arranged to illuminate the print 1 on the impression cylinder 2 and reflected light reflected by the print 1 by illumination light of the illumination means. A photographing unit 4 for capturing image information of the printed material 1, an air ejection unit 15 for pressing the printed material 1 against the impression cylinder 2, and an image processing unit (not shown) for processing the image information input from the photographing unit 4 are provided. ing.

  The photographing means 4 is a single wide-angle CCD camera, as in the conventional example, and is arranged so as to face the axis O of the impression cylinder 2 from the impression cylinder 2 at a predetermined interval. The one photographing position P is arranged in a single line along the axial direction of the impression cylinder 2 and has a predetermined length range so as to correspond to the maximum width of the paper surface on the impression cylinder 2. Here, the photographing unit 4 may be an analog camera that processes captured image information in an analog manner, or may be a digital camera that internally digitizes the captured image information.

  The illumination means (not shown) includes a white LED (light emitting diode) as a light source and an elliptical reflecting mirror having a predetermined curved surface, as in the conventional example, and irradiation light generated by the white LED is The light is collected in a line along the axial direction of the impression cylinder 2 by an elliptical reflecting mirror, and is irradiated so as to substantially coincide with the photographing position P of the printed matter 1 of the photographing means 4.

  The image processing unit (not shown) includes an A / D converter (not shown) for digitizing the image signal of the image information captured by the photographing means 4 and the printed matter 1 in a normal manner, substantially the same as the conventional one. 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. The means 15 is controlled. Here, when the photographing means 4 is a digital camera capable of digitizing photographed image information, an A / D converter in the image processing unit is not necessary.

  The air ejecting means 15 is connected via an air blower (not shown), an air control unit (not shown) for controlling and supplying air from the air blower, and the first pipe 16 from the air control unit. A first air ejection portion 17 disposed in the vicinity of the photographing line S of the photographing means 4 (a line where the CCD camera faces the axis O of the impression cylinder 2) is connected to the air control portion via a second pipe 18. And a second air ejection portion 19 connected to the first air ejection portion 17 via a joining means such as a bolt and disposed on the side opposite to the imaging position from the first air ejection portion 17. These are arranged so as not to obstruct the shooting range and the irradiation range of the illumination means. Here, the first air ejection part 17 and the second air ejection part 19 may be separately provided with an air blower and an air control part.

  The first air ejection portion 17 can introduce air from the first pipe 16 and is formed along the width direction (axial direction) of the impression cylinder 2 and the lower surface of the air chamber 20 on the imaging line S side. And a plate-like nozzle body 21 having a predetermined thickness formed along the width direction (axial direction) of the impression cylinder 2. The plate-like nozzle body 21 includes air A plurality of ejection holes 22 formed at predetermined intervals in the width direction (axial direction) of the impression cylinder 2 so as to direct the ejection direction from the air chamber 20 toward the printed matter 1 are provided.

  The second air ejection part 19 can introduce air from the second pipe 18, and is formed along the circumferential direction and the width direction (axial direction) of the impression cylinder 2, and has an air ejection surface 23 having a predetermined area on the lower surface. The air chamber 24 is fixed in contact with the bottom surface of the air chamber 20 of the first air ejection portion 17 and the back surface of the plate-like nozzle body 21. Here, the air ejection surface 23 is formed so as to extend from the plate-like nozzle body 21 of the first air ejection portion 17 to the anti-imaging line S (anti-imaging position) side, and in the circumferential direction of the impression cylinder 2. It is curved along a curved surface, and the distance between the impression cylinder 2 and the air ejection surface 23 restricts the escape area of the air ejected from the air ejection surface 23 to form the pressed air layer A and the printed matter is ejected from the air. The distance is set so as not to contact the surface 23.

  In addition, a large number of ejection holes 25 having a small diameter are formed at predetermined intervals on the air ejection surface 23 formed in the air chamber 24 of the second air ejection portion 19 so as to be located on the entire lower surface of the air chamber 24. . Here, on the air ejection surface 23 formed in the air chamber 24 of the second air ejection section 19, a plurality of slits 25a having a predetermined width are formed so as to be located on the entire lower surface of the air chamber 24 as shown in FIG. You may do it.

  The operation of the first example of the embodiment of the present invention will be described below.

  When inspecting the printed matter 1 with the printed matter quality inspection device, air is ejected from the ejection hole 22 of the first air ejection portion 17 via the air blower and the air control unit, and the air ejection surface 23 of the second air ejection portion 19 is used. Air is blown out from the nozzle, and the printed material 1 whose tip is locked by the gripper 13 is pressed onto the impression cylinder 2, and at the same time, the photographing unit 4 detects the reflected light reflected from the printed material 1 by the irradiation light of the illumination unit. Then, the image information of the printed matter 1 is captured, the image signal of the image information is sent to the CPU via the A / D converter, and the CPU compares the image signal of the image information with the reference signal of the reference memory, and the abnormality of the printed matter 1 Is detected.

  At this time, the first air ejection unit 17 brings the pressing position of the air that presses the printed material 1 against the impression cylinder 2 close to the shooting position of the printed material 1, and blows air substantially perpendicularly to the printed material 1, It is pressed against the impression cylinder 2 so that it can be photographed. In the second air ejection portion 19, the air ejected from the air ejection surface 23 forms a pressed air layer A and presses the printed matter 1 with a predetermined area.

  On the other hand, when the printed matter 1 locked by the gripper 13 is released from the impression cylinder 2 and the blanket cylinder 14 and a force acts so that the rear side of the printed matter 1 jumps upward due to the material of the printed matter 1, The pressed air layer A of the portion 19 prevents the printed material 1 from jumping up, and the first air ejection unit 17 presses the printed material 1 onto the impression cylinder 2 in a state where it can be photographed.

  Thus, according to the embodiment of the present invention, even when the printed matter 1 is released from the impression cylinder 2 and the blanket cylinder 14, the printed matter 1 can be photographed onto the impression cylinder 2 by the first air ejection portion 17. Since the press air layer A is formed by the second air ejection part 19 to prevent the printed matter 1 from jumping up, the image quality of the printed matter 1 is suppressed and the quality inspection of the printed matter 1 is appropriately performed. At the same time, it is possible to suitably prevent the portion of the printed material 1 that has been bounced up from coming into contact with the tip of the first air ejection portion 17 and the second air ejection portion 19 of the air ejection means 15. Here, even if only the second air ejection part 19 can prevent the jumping up, the image of the printed matter 1 cannot be maintained in a state where it can be photographed, and the first air ejection part 17 alone is suitable for the jumping up. Cannot be prevented.

  In the embodiment of the present invention, when the second air ejection portion 19 forms the air ejection surface 23 along the circumferential direction and the width direction (axial direction) of the impression cylinder 2, the predetermined range of the printed matter 1 on the impression cylinder 2. By forming the surface of the pressed air layer A on the surface, the printed product 1 is prevented from jumping up on the surface of the pressed air layer A. Therefore, the quality inspection of the printed product 1 can be performed more appropriately by suppressing the deviation of the image of the printed product 1 sufficiently. In addition to this, it is possible to more suitably prevent the possibility that the part of the printed matter 1 that has jumped up will come into contact with the tip of the air jetting means 15.

  In the embodiment of the present invention, when the air ejection surface 23 of the second air ejection part 19 is formed so as to extend from the first air ejection part 17 to the counter-photographing position side, the second air ejection part 19 is The air ejected by the first air ejection unit 17 is not affected, and the printed air 1 is prevented from jumping up by the pressed air layer A. Therefore, the quality of the printed material 1 can be further inspected by suppressing the deviation of the image of the printed material 1. While performing appropriately, the possibility that the part which the printed matter 1 bounces up may contact the front-end | tip of the air ejection means 15 can be prevented more suitably.

  In the embodiment of the present invention, when the second air ejection part 19 forms a large number of ejection holes 25 on the air ejection surface 23, the air ejected from the numerous ejection holes 25 flows from the air ejection surface 23 to the printed material 1. Since the escape space is limited in the middle, the pressed air layer A is suitably formed, and as a result, the image of the printed matter 1 is sufficiently suppressed to perform the quality inspection of the printed matter 1 more appropriately. It is possible to more appropriately prevent the possibility that the part of 1 that jumps up contacts the tip of the air jetting means 15. In addition, a large number of ejection holes 25 are formed in the air ejection surface 23, and the ejected air is located between the air ejection surface 23 and the printed matter 1 and the escape space is limited. Even so, the pressed air layer A can be suitably formed.

  In the embodiment of the present invention, when the second air ejection part 19 forms the slit 25a on the air ejection surface 23, the air ejected from the ejection hole 25 of the slit 25a is located between the air ejection surface and the printed matter. Since the escape space is limited, the compressed air layer A is preferably formed, and as a result, the image 1 of the printed matter 1 is sufficiently suppressed to perform the quality inspection of the printed matter 1 more appropriately, and the printed matter 1 jumps up. The possibility that the portion may come into contact with the tip of the air ejecting means 15 can be more suitably prevented. In addition, a plurality of slits 25a are formed on the air ejection surface 23, and the ejected air is located between the air ejection surface 23 and the printed matter 1 and the escape space is limited. Therefore, the air pressure is weak or strong. Even if it exists, the pressurization air layer A can be formed suitably. Furthermore, since the ejection hole 25 is formed by the slit 25a, the manufacturing cost of the second air ejection portion 19 can be reduced.

  In the embodiment of the present invention, the first air ejection unit 17 brings the pressing position of the air that presses the printed matter 1 against the impression cylinder 2 close to the photographing position of the printed matter 1 and makes the air substantially perpendicular to the printed matter 1. When configured to spray, the air presses the printed material 1 onto the impression cylinder 2 in a state where it can be photographed. Therefore, the quality of the printed material 1 can be more appropriately inspected by sufficiently suppressing the image displacement of the printed material 1. . Moreover, since the turbulent flow generated on the surface of the printed matter 1 can be reduced by blowing the air substantially perpendicularly to the printed matter 1, the fluttering of the printed matter 1 can be suppressed.

  4 and 5 show a second example of the embodiment of the present invention, and the parts denoted by the same reference numerals as those in FIGS. 1 to 3 represent the same thing.

  The printed material quality inspection apparatus of the second example includes illumination means (not shown), imaging means 4 and an image processing unit (not shown) substantially the same as those of the first example, and the air ejection means 15 of the first example. This is a modification of the configuration.

  The air ejection means 26 in the second example includes an air blower (not shown), an air control unit (not shown) that controls and feeds air from the air blower, and the air control unit through the first pipe 16. A first air ejection part 27 that is connected and arranged close to the photographing line S of the photographing means 4 (a line in which the CCD camera faces the axis O of the impression cylinder 2), and a second pipe 18 from the air control part. And a second air ejection portion 28 disposed on the side opposite to the imaging position from the first air ejection portion 27 so as not to obstruct the imaging range of the imaging means 4 and the irradiation range of the illumination means, respectively. Has been placed. Here, the first air ejection part 27 and the second air ejection part 28 may be separately provided with an air blower and an air control part.

  The first air ejection portion 27 can introduce air from the first pipe 16 and has an air chamber 29 formed along the width direction (axial direction) of the impression cylinder 2 and the width direction (axial direction) of the impression cylinder 2. And a plate-like nozzle body 30 having a predetermined thickness formed along the surface of the air chamber 29, and a plate-like nozzle body 30 having a predetermined thickness extending downward on the lower surface of the air chamber 29 on the imaging line S side. And is constructed by assembling along the width direction (axial direction) of the impression cylinder 2. Further, the plate-like nozzle body 30 is provided with a plurality of ejection holes 31 formed at predetermined intervals in the width direction (axial direction) of the impression cylinder 2 so that the air ejection direction is directed from the air chamber 29 toward the printed matter 1. Yes.

  The second air ejection portion 28 can introduce air from the second pipe 18 of the first air ejection portion 27 and is formed along the circumferential direction and the width direction (axial direction) of the impression cylinder 2 and has a predetermined area on the lower surface. The air chamber 33 having the air ejection surface 32 is provided, and the air chamber 33 is integrated with the plate-like nozzle body 30 so that the first air ejection portion 27 and the second air ejection portion 28 can be integrally formed. It has become. Here, the air ejection surface 32 is formed so as to extend from the plate-like nozzle body 30 of the first air ejection portion 27 to the anti-photographing line S (anti-photographing position) side, and in the circumferential direction of the impression cylinder 2. It is curved along a curved surface, and the distance between the impression cylinder 2 and the air ejection surface 32 restricts the escape area of the air ejected from the air ejection surface 32 to form the pressed air layer A and the printed matter is ejected from the air. The distance is set so as not to contact the surface 32.

  Further, the air ejection surface 32 formed in the air chamber 33 of the second air ejection portion 28 has a large number of ejection holes 34 with a small diameter so as to be located on the entire lower surface of the air chamber 33, as in the first example. Are formed at predetermined intervals. Here, the air ejection surface 32 formed in the air chamber 33 of the second air ejection portion 28 has a plurality of slits 25a having a predetermined width so as to be located on the entire lower surface of the air chamber 33, as in the first example. May be formed.

  The operation of the second example of the embodiment of the present invention will be described below.

  When inspecting the printed matter 1 with the printed matter quality inspection device, air is ejected from the ejection holes 31 of the first air ejection portion 27 via the air blower and the air control portion, and the second air is substantially the same as in the first example. Air is ejected from the air ejection surface 32 of the ejection part 28, and the printed matter 1 whose tip is locked by the gripper 13 is pressed onto the impression cylinder 2, and at the same time, the photographing means 4 is printed on the printed matter 1 by the irradiation light of the illumination means. The reflected light reflected in the image is detected and the image information of the printed matter 1 is taken in. The image signal of the image information is sent to the CPU via the A / D converter, and the CPU receives the image signal of the image information and the reference signal of the reference memory. Are detected, and abnormality of the printed matter 1 is detected.

  At this time, the first air ejection part 27 brings the pressing position of the air that presses the printed matter 1 against the impression cylinder 2 close to the photographing position of the printed matter 1 and the air with respect to the printed matter 1 substantially as in the first example. The printed material 1 is pressed onto the impression cylinder 2 so that it can be photographed. Further, in the second air ejection portion 28, the air ejected from the air ejection surface 32 forms a pressed air layer A and presses the printed matter 1 with a predetermined area, as in the first example.

  On the other hand, when the printed matter 1 locked by the gripper 13 is released from the impression cylinder 2 and the blanket cylinder 14 and a force acts so that the rear side of the printed matter 1 jumps upward due to the material of the printed matter 1, In a similar manner, the pressed air layer A of the second air ejection portion 28 prevents the printed material 1 from jumping up, and the first air ejection portion 27 presses the printed material 1 onto the impression cylinder 2 in a state where it can be photographed.

  Thus, according to the embodiment of the present invention, substantially the same operational effects as the first example can be obtained. In addition, when the first air ejection part 27 and the second air ejection part 28 are integrally formed, the relative positions of the first air ejection part 27 and the second air ejection part 28 are always kept suitable. The quality of the printed matter 1 is appropriately checked while suppressing the occurrence of the problem, and the portion of the printed matter 1 that has jumped up is preferably in contact with the tip of the first air ejection portion 27 and the second air ejection portion 28 of the air ejection means 26. Can be prevented. Moreover, the manufacturing cost of the first air ejection part 27 and the second air ejection part 28 can be reduced, and the first air ejection part 27 and the second air ejection part 28 can be easily installed.

  FIG. 6 is a third example of an embodiment for carrying out the present invention, and the same reference numerals as those in FIGS.

  The printed material quality inspection apparatus of the third example includes illumination means (not shown), imaging means 4 and an image processing unit (not shown) substantially the same as the first example, and the air ejection means 15 of the first example. The configuration is further modified.

  The air ejection means 35 in the third example is connected via an air blower (not shown), an air control unit (not shown) for controlling and supplying air from the air blower, and a pipe 36 from the air control unit. And an air ejection portion 37 disposed in the vicinity of the photographing line S of the photographing means 4 (a line in which the CCD camera faces the axis O of the impression cylinder 2), and the photographing range of the photographing means 4 and the irradiation range of the illuminating means It is arranged so as not to become an obstacle.

  The air ejection portion 37 can introduce air from the pipe 36 and is formed along the circumferential direction and width direction (axial direction) of the impression cylinder 2 and has an air ejection surface 38 having a predetermined area on the lower surface. It has. Here, the air ejection surface 38 is formed so as to extend away from the imaging line S (imaging position) side, and is curved along the circumferential curved surface of the impression cylinder 2. The distance between the air jetting surface 38 and the air jetting surface 38 is set such that the escape area of the air jetted from the air jetting surface 38 is limited to form the pressed air layer A and the printed material does not contact the air jetting surface 38.

  In addition, on the air ejection surface 38 formed in the air chamber 39 of the air ejection portion 37, a large number of ejection holes 40 are formed at predetermined intervals with a small diameter so as to be located on the entire lower surface of the air chamber 39. Here, on the air ejection surface 38 formed in the air chamber 39 of the air ejection portion 37, a plurality of slits 25a having a predetermined width are formed so as to be positioned on the entire lower surface of the air chamber 39. You may do it.

  The operation of the third example of the embodiment of the present invention will be described below.

  When the printed matter 1 is not a material having a large jump as in the first example and the second example but a material having a slight jump, when the printed matter 1 is inspected by the printed quality inspection device, the air ejection part 37 is used. Air is ejected from the air ejection surface 38 and the printed material 1 whose tip is locked by the gripper 13 is pressed onto the impression cylinder 2. At the same time, the photographing means 4 is reflected by the printed material 1 by the irradiation light of the illumination means. The reflected light is detected and the image information of the printed material 1 is captured, and the image signal of the image information is sent to the CPU via the A / D converter. The CPU compares the image signal of the image information with the reference signal of the reference memory. An abnormality of the printed material 1 is detected.

  At this time, in the air ejection part 37, the air ejected from the air ejection surface 38 forms a pressed air layer A and presses the printed matter 1 with a predetermined area.

  Thus, according to the embodiment of the present invention, if the printed matter 1 is not a material having a large jump, as in the first example and the second example, but a material having a slight jump, the air ejection means 35 Since the air ejecting portion 37 presses the printed matter 1 onto the impression cylinder 2 in a state where the printed matter 1 can be photographed, and the air layer A is formed to prevent the printed matter 1 from jumping up. Quality inspection can be performed appropriately.

  In addition, the printed matter quality inspection apparatus of the present invention is not limited to the above-described embodiments, and it is needless to say that various modifications can be made without departing from the gist of the present invention.

It is a conceptual diagram which shows the 1st example of the form which implements the printed matter quality inspection apparatus of this invention. It is sectional drawing of the II-II arrow of FIG. It is a bottom view which shows the state which formed the slit in the air ejection surface of a 2nd air ejection part. It is a conceptual diagram which shows the 2nd example of the form which implements the printed matter quality inspection apparatus of this invention. It is sectional drawing of the VV arrow of FIG. It is a conceptual diagram which shows the 3rd example of the form which implements the printed matter quality inspection apparatus of this invention. It is the schematic which shows the conventional printed matter quality inspection apparatus. It is sectional drawing of the VIII-VIII arrow of FIG. It is a conceptual diagram which shows the state in which printed matter jumps up.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Printed matter 2 Pressure drum 3 Illumination means 4 Imaging means 15 Air ejection means 17 1st air ejection part 19 2nd air ejection part 20 Air chamber 23 Air ejection surface 25 Ejection hole 25a Slit 26 Air ejection means 27 First air ejection part 28 2nd air ejection part 32 Air ejection surface 34 Ejection hole 35 Air ejection means 37 Air ejection part 38 Air ejection surface 40 Ejection hole A Pressing air layer

Claims (7)

  Illuminating means for illuminating a printed matter printed by a sheet-fed printing machine on an impression cylinder, photographing means for detecting reflected light reflected by the printed matter by illumination light of the illuminating means and capturing image information of the printed matter, and An air jetting unit that jets air toward the impression cylinder, and inspects an abnormality of the printed matter in-line based on the image information, wherein the air ejection unit removes the printed matter from the impression cylinder. A printed product quality inspection apparatus, comprising: a first air ejection portion that is pressed in a state where photographing is possible, and a second air ejection portion that forms a pressed air layer so as to prevent the printed matter from jumping up.   The printed air quality inspection device according to claim 1, wherein the second air ejection portion has an air ejection surface along a circumferential direction and a width direction of the impression cylinder.   The printed matter quality inspection device according to claim 1 or 2, wherein the air ejection surface of the second air ejection portion is formed to extend from the first air ejection portion to the side opposite to the photographing position.   The printed air quality inspection device according to any one of claims 1 to 3, wherein the second air ejection portion has a plurality of ejection holes formed on an air ejection surface.   The printed air quality inspection device according to any one of claims 1 to 3, wherein the second air ejection portion has a slit formed on the air ejection surface.   The printed matter quality inspection apparatus according to any one of claims 1 to 5, wherein the first air ejection portion and the second air ejection portion are integrally formed.   The print quality inspection according to claim 1, wherein the first air ejection unit is configured to bring an air pressing position for pressing the printed material against the impression cylinder close to a photographing position of the printed material and to blow air substantially perpendicularly to the printed material. apparatus.

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