JP2010149412A - Printing apparatus, printing method, sheet-fed printer, and rotary printing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance printing accuracy in a printing apparatus, a printing method, a sheet-fed printer, and a rotary printing machine. <P>SOLUTION: The printing apparatus includes: a rotatable impression cylinder 32; a blanket cylinder 31 rotatable synchronously with the impression cylinder 32 while contacting the impression cylinder and capable of conveying a printing sheet S while pinching it with the impression cylinder 32; an inkjet head 34 for forming images by spraying UV ink onto the surface of the blanket cylinder 31; a first UV lamp 35 for primarily drying the UV ink of the images formed on the surface of the blanket cylinder 31 by the inkjet head 34; and a second UV lamp 36 for secondarily drying the UV ink of the images transferred from the blanket cylinder 31 to the printing sheet S. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a printing apparatus and a printing method for performing printing using an inkjet head, and a sheet-fed printing press and a rotary printing press provided with the printing apparatus.

  As printing apparatuses that perform printing using an inkjet head, there are those described in Patent Documents 1 and 2 below. The ink jet printing machine described in Patent Document 1 includes a blanket cylinder, a plurality of nozzles facing the blanket cylinder, and a pressure rubber roller having a fixed nip width with respect to the blanket cylinder. Ink droplets are ejected to record an ink image, and the blanket cylinder is rotated to transfer the ink image to the printing paper at the contact portion with the pressure rubber roller.

  Further, the offset printing method using the ink jet method described in Patent Document 2 prints a UV ink image on a flat original plate by ink jet using UV ink, and irradiates with UV or an electron beam to half-process the UV ink image. It is a dry state, a semi-dry UV ink image is copied onto the surface of the elastic blanket, the UV ink image copied onto the elastic blanket is offset printed on the substrate, and the offset UV ink image is dried and fixed. is there.

JP 2002-166532 A JP 2006-130725 A

  In the ink jet printer described in Patent Document 1 described above, an ink image is recorded on a blanket cylinder by an ink jet head, and the ink image is transferred to a printing paper. In general, in a printing apparatus that performs printing using an inkjet head, low-viscosity ink is used to form an image (pattern or character) on an object by ejecting ink from a plurality of nozzles. For this reason, when an ink image is transferred onto a printing paper in a conventional ink jet printer, the ink may permeate the printing paper and the printing accuracy may be reduced.

  In the offset printing method using the ink jet method described in Patent Document 2, a UV ink image printed on a flat original plate is made into a semi-dry state by irradiation with UV or an electron beam, and this semi-dry UV ink image is applied to an elastic blanket surface. Copying and offset printing on the substrate. That is, the back side of the image printed on the substrate is not the front side to be semi-dried on the flat original plate, but the back side, and drying is not sufficient, and the ink has a low viscosity. Therefore, when the substrate to be printed is paper, the ink penetrates the paper and it is difficult to perform high-precision printing.

  SUMMARY An advantage of some aspects of the invention is to provide a printing apparatus and a printing method for improving printing accuracy, a sheet-fed printing press, and a rotary printing press.

  In order to achieve the above object, a printing apparatus according to the invention of claim 1 is characterized in that a rotatable printing cylinder and a printing medium that can rotate synchronously in contact with the printing cylinder and between the printing cylinder. A blanket cylinder that can be sandwiched and conveyed, an inkjet head that forms an image by spraying ultraviolet curable ink onto the surface of the blanket cylinder, and an ultraviolet curable ink of an image formed on the surface of the blanket cylinder by the inkjet head. A first ultraviolet irradiation device for primary drying, and a second ultraviolet irradiation device for secondary drying of an ultraviolet curable ink of an image transferred from the blanket cylinder to a printing medium.

  In the printing apparatus according to the invention of claim 2, the image formed on the surface of the blanket cylinder is irradiated with ultraviolet rays from one surface side which is the surface side and is primarily dried, and the one surface side is the surface of the printing medium. The image transferred to the surface of the printing medium and transferred to the surface of the print medium is characterized in that it is subjected to secondary drying by being irradiated with ultraviolet rays from the other surface side which is the surface side.

  In the printing apparatus according to the invention of claim 3, the first ultraviolet irradiation device irradiates the image formed on the surface of the blanket cylinder with ultraviolet rays so that the viscosity of the ultraviolet curable ink is increased. The second ultraviolet ray irradiation device is characterized in that the image transferred to the printing medium is irradiated with ultraviolet rays and finally dried until the ultraviolet curable ink is cured.

  According to a fourth aspect of the present invention, there is provided a cleaning device for cleaning the surface of the blanket cylinder after an image formed on the surface of the blanket cylinder is transferred to a printing medium.

  Further, the printing method of the invention of claim 5 forms an image by spraying ultraviolet curable ink on the surface of the rotating blanket cylinder, and irradiates the ultraviolet curable ink of the image formed on the surface of the blanket cylinder with ultraviolet rays. Then, the ultraviolet curable ink of the image that has been primarily dried and primarily dried on the surface of the blanket cylinder is transferred to a print medium that is sandwiched between and conveyed with a printing cylinder that rotates in contact and synchronously. The ultraviolet curable ink of the transferred image is irradiated with ultraviolet rays and subjected to secondary drying.

  According to a sixth aspect of the present invention, there is provided a sheet-fed printing machine, wherein a sheet feeding device that sucks and feeds the sheets stacked on the sheet feeding table, and a sheet that is fed from the sheet feeding device is a printing cylinder. A printing apparatus for transferring the image formed between the blanket cylinder and transferring the image formed on the blanket cylinder to a sheet, and printing the sheet printed on the printing apparatus. A sheet-fed printing press provided with a sheet discharge device that stacks and discharges the sheet onto a sheet-fed printing machine, wherein the printing apparatus sprays ultraviolet curable ink onto the surface of the blanket cylinder to form an image, and the blanket is formed by the inkjet head. A first ultraviolet irradiation device for primarily drying the ultraviolet curable ink of the image formed on the surface of the cylinder; and a second for drying the ultraviolet curable ink of the image transferred from the blanket cylinder to the sheet. It is characterized in that it has an ultraviolet irradiation device.

  According to a seventh aspect of the present invention, there is provided a rotary printing machine for feeding a web from a web, and conveying the web fed from the paper feeding apparatus between a printing cylinder and a blanket cylinder, and the blanket. A printing device for transferring an image formed on a cylinder to a web for printing, a drying device for drying a web printed by the printing device, and cutting and bending the web dried by the drying device. In the rotary printing press comprising a folding device that forms a fold and a paper discharge device that discharges the fold formed by the folding device, the printing device applies ultraviolet curable ink to the surface of the blanket cylinder. An ink jet head that forms an image by spraying, and an ultraviolet curable ink of an image formed on the surface of the blanket cylinder by the ink jet head is first dried. An ultraviolet irradiation apparatus, is characterized in that it has a, a second ultraviolet irradiation device for secondary drying the ultraviolet curable ink image is transferred to the web from the blanket cylinder.

  According to the printing apparatus of the first aspect of the present invention, an inkjet head that enables conveyance with a printing medium sandwiched between a printing cylinder and a blanket cylinder, and forms an image by spraying ultraviolet curable ink on the surface of the blanket cylinder; A first ultraviolet irradiation device for primarily drying the ultraviolet curable ink of the image formed on the surface of the blanket cylinder and a second ultraviolet irradiation device for secondary drying of the ultraviolet curable ink of the image transferred to the printing medium are provided. ing. Therefore, the ultraviolet curable ink of the image formed on the surface of the blanket cylinder by the inkjet head is first dried from the first ultraviolet irradiation device and then transferred to the printing medium, so that it is printed from the blanket cylinder with the viscosity increased. Since the ink is transferred to the medium, the ink does not penetrate into the print medium, and the printing accuracy can be improved.

  According to the printing apparatus of the second aspect of the present invention, the image formed on the surface of the blanket cylinder is irradiated with ultraviolet rays from one surface side that is the surface side to be primarily dried, and the one surface side is the printing medium. The image transferred to the surface of the printing medium is transferred to the surface of the printing medium, and the image transferred to the surface of the printing medium is subjected to secondary drying by irradiating with ultraviolet rays from the other side, which is the surface side. Can be dried properly.

  According to the printing apparatus of the third aspect of the invention, the first ultraviolet irradiation device irradiates the image formed on the surface of the blanket cylinder with ultraviolet rays so that the viscosity of the ultraviolet curable ink is increased. The second ultraviolet irradiation device irradiates the image transferred to the printing medium with ultraviolet rays and performs the main drying until the ultraviolet curable ink is cured. And the image on the print medium can be properly fixed.

  According to the printing apparatus of the fourth aspect of the present invention, since the image formed on the surface of the blanket cylinder is transferred to the printing medium, and the cleaning device for cleaning the surface of the blanket cylinder is provided, the ink remaining on the blanket cylinder is removed. By doing so, the print quality can be improved.

  According to the printing method of the invention of claim 5, an image is formed by spraying ultraviolet curable ink on the surface of the rotating blanket cylinder, and ultraviolet rays are applied to the ultraviolet curable ink of the image formed on the surface of the blanket cylinder. The ultraviolet curable ink of the image that has been irradiated and primarily dried and then primarily dried on the surface of the blanket cylinder is transferred to a print medium that is sandwiched between and conveyed with a printing cylinder that rotates in contact and synchronously. The ultraviolet curable ink of the image transferred to is irradiated with ultraviolet rays and secondarily dried. Accordingly, the ink is transferred from the blanket cylinder to the printing medium in a state where the viscosity is increased, and the ultraviolet curable ink does not penetrate into the printing medium, and the printing accuracy can be improved.

  According to the sheet-fed printing press of the invention of claim 6, the sheet feeding device, the printing device, and the paper discharge device are provided, and as the printing device, the image is obtained by spraying ultraviolet curable ink on the surface of the blanket cylinder. A first ultraviolet irradiation device for primarily drying the ultraviolet curable ink of the image formed on the surface of the blanket cylinder, and a secondary drying of the ultraviolet curable ink of the image transferred to the sheet. And a second ultraviolet irradiation device. Accordingly, since the ultraviolet curable ink of the image formed on the surface of the blanket cylinder by the inkjet head is first dried by the first ultraviolet irradiation device and then transferred to the sheet, the viscosity is increased from the blanket cylinder. As a result, the ultraviolet curable ink does not penetrate into the printing medium, and the printing accuracy can be improved.

  Further, according to the rotary printing press of the invention of claim 7, the sheet feeding device, the printing device, the drying device, the folding device, and the paper discharge device are provided, and the surface of the blanket cylinder as the printing device is UV curable. An inkjet head that forms an image by spraying ink, a first ultraviolet irradiation device that primarily dries the ultraviolet curable ink of the image formed on the surface of the blanket cylinder, and two ultraviolet curable inks of the image transferred to the web. A second ultraviolet irradiation device for subsequent drying is provided. Therefore, since the ultraviolet curable ink of the image formed on the surface of the blanket cylinder by the inkjet head is primarily dried by the first ultraviolet irradiation device and then transferred to the web, the viscosity is increased from the blanket cylinder to the web. As a result, the ultraviolet curable ink does not penetrate into the web, and as a result, the printing accuracy can be improved.

  Exemplary embodiments of a printing apparatus, a printing method, and a sheet-fed printing press and a rotary printing press according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this Example.

  1 is a schematic configuration diagram illustrating a sheet-fed printing press including a printing apparatus according to a first embodiment of the present invention, FIG. 2 is a schematic diagram illustrating a main part of the printing apparatus according to the first embodiment, and FIG. 6 is a schematic diagram illustrating an image transfer state in the printing apparatus of Example 1. FIG.

  As shown in FIG. 1, the offset sheet-fed printing press according to this embodiment includes a paper feeding device 11, a transport device 12, a printing device 13, and a paper discharge device 14. In the present embodiment, a print sheet (print medium) S as a sheet that is stacked and placed on the sheet feeding device 11 is printed by a non-illustrated multicolor sheet-fed printing machine except for a predetermined area. The printing device 13 performs printing on a predetermined area of white paper. Note that the multicolor sheet-fed printing press has four printing units corresponding to, for example, black, black, cyan, magenta, and yellow. Each printing unit has substantially the same configuration, and includes an inking device, a plate cylinder, a blanket cylinder, and an impression cylinder. When the printing sheet S passes between the blanket cylinder and the impression cylinder, printing is performed from the blanket cylinder. Ink (printed image) is transferred to the sheet S and printing is performed.

  The paper feeder 11 described above has a paper feeder 21 and a separator device 22 as a paper feed mechanism. The paper feed tray 21 stacks and places the print sheets S, and the separator device 22 picks up and sends out a large number of print sheets S stacked on the paper feed tray 21 one by one from the top. is there. In this case, the paper feed table 21 can be moved up and down in response to the supply of the print sheet S so that the separator device 22 can maintain a substantially constant height positional relationship with the print sheet S.

  The conveying device 12 conveys the printing sheet S sent out from the paper feeding device 11 and positions it at a predetermined position, and supplies it to the printing device 13. In the conveying device 12, a feed roller 23 and a tailing roller 24 are disposed adjacent to each other adjacent to the sheet feeding device 11, and a conveying belt 26 wound around a plurality of guide rollers 25 is disposed. A front pad 27 is disposed adjacent to the printing device 13.

  In the printing apparatus 13, a blanket cylinder 31 and an impression cylinder (printing cylinder) 32 are rotatably supported by being in contact with each other up and down, while being in contact with the impression cylinder 32 and adjacent to the front pad 27, the intermediate cylinder 33 is rotatable. It is supported by. The blanket cylinder 31, the impression cylinder 32, and the intermediate cylinder 33 are gear-coupled so as to be able to rotate synchronously along the arrow direction, and can be rotated by a single motor (not shown). In this case, the blanket cylinder 31 is wound with a blanket having a surface formed of silicon in consideration of image releasability. Moreover, the impression cylinder 32 and the intermediate | middle cylinder 33 have the claw 32a and 33a (refer FIG. 2), respectively. The gripping claw 33 a of the intermediate cylinder 33 grasps and conveys the leading end portion (front end portion in the conveyance direction) of the printing sheet S positioned on the front pad 27 of the conveying device 12, and then the gripping claw of the impression cylinder 32. 32a grasps and conveys the leading end portion of the print sheet S released by the gripping claws 33a of the intermediate cylinder 33.

  Around the outer periphery of the blanket cylinder 31, there is provided an inkjet head 34 for spraying ultraviolet curable ink (hereinafter referred to as UV ink) onto the surface of the blanket cylinder 31 to form an image. The inkjet head 34 has a plurality of nozzles (not shown) arranged along the axial direction of the blanket cylinder 31. In addition, the UV ink of the image formed on the surface of the blanket cylinder 31 by the inkjet head 34 is primarily dried around the outer periphery of the blanket cylinder 31 on the downstream side of the inkjet head 34 in the rotation direction of the blanket cylinder 31. A first UV lamp 35 is provided as a single ultraviolet irradiation device. Further, two UV inks of an image transferred from the blanket cylinder 31 to the printing sheet S are disposed on the outer periphery of the impression cylinder 32 at a position downstream of the contact position with the blanket cylinder 31 in the rotation direction of the impression cylinder 32. A second UV lamp 36 is provided as a second ultraviolet irradiation device for subsequent drying. In this case, the output of the first UV lamp 35 is 10 to 30% and the output of the second UV lamp 36 is 70 to 90% of the output of the UV ink sprayed by the inkjet head 34 completely. Yes.

  The blanket cylinder 31 is located on the outer periphery of the blanket cylinder 31 at a position downstream of the contact position with the impression cylinder 32 in the rotational direction of the blanket cylinder 31 and upstream of the inkjet head 34 in the rotational direction of the blanket cylinder 31. A cleaning roller 37 is provided as a cleaning device for cleaning the surface of the blanket cylinder 31 after the image formed on the surface of the cylinder 31 is transferred to the printing sheet S. The cleaning roller 37 rotates with the blanket cylinder 31 or rotates in the reverse direction to remove UV ink remaining on the surface of the blanket cylinder 31.

  The paper discharge device 14 conveys the print sheets S printed by the printing device 13 and stacks them up and down in an aligned state. The paper discharge device 14 includes a chain gripper 28 that conveys the print sheet S, a paper discharge tray 29 on which the printed print sheets S are stacked, and a paper pad 30 that aligns the print sheets S. The chain gripper 28 has a plurality of gripping claws 28 a that grip the leading end portion of the printing sheet S, receives the printing sheet S from the impression cylinder 32 of the printing apparatus 13, and conveys the printing sheet S to a predetermined position above the paper discharge tray 29. To do. The discharge table 29 is lowered continuously or stepwise so that the drop distance of the print sheet S becomes substantially constant when the height of the top surface of the uppermost stage rises as the print sheets S are stacked. It is possible. The paper pad 30 regulates the leading end position in the traveling direction of the printing sheet S.

  Here, the printing method by the offset sheet-fed printing press of the present Example comprised in this way is demonstrated.

  First, the print sheets S stacked on the paper feed tray 21 of the paper feeder 11 are picked up one by one from the top by the separator device 22 and sent to the transport device 12. Next, the transport device 12 After the sheets S are positioned by the front pads 27, they are sequentially supplied to the printing apparatus 13.

  Subsequently, in the printing apparatus 13, the inkjet head 34 blows UV ink from a plurality of nozzles toward the blanket cylinder 31 to form a predetermined image on the surface of the blanket cylinder 31. The image moving with the rotation of the blanket cylinder 31 is primarily dried, that is, semi-dried by the ultraviolet light from the first UV lamp 35. On the other hand, the intermediate cylinder 33 receives the print sheet S sent out from the conveying device 12 and transfers it to the impression cylinder 32. When the printing sheet S is conveyed to the impression cylinder 32 and passes through the blanket cylinder 31 while being pressed, the image on the blanket cylinder 31 is transferred to the printing sheet S. Thereafter, the image moving with the rotation of the impression cylinder 32 is subjected to secondary drying, that is, main drying by ultraviolet light from the second UV lamp 36.

  The blanket cylinder 31 having the image transferred to the printing sheet S on the surface comes into contact with the cleaning roller 37, so that the UV ink remaining on the surface is removed.

  The drying and generation of the image (UV ink) described above will be described in detail. As shown in FIG. 2, the UV ink (white) A of the image sprayed from the inkjet head 34 onto the surface of the blanket cylinder 31 and formed on the surface of the blanket cylinder 31 is in a low viscosity state. The low-viscosity image UV ink (outlined) A to which the blanket cylinder 31 is rotated and moved is converted into a semi-dried UV ink (oblique line) B by the ultraviolet light from the first UV lamp 35. The UV ink (oblique line) B of the image in a semi-dry state in which the blanket cylinder 31 is further rotated and moved is caused by a predetermined nip acting between the blanket cylinder 31 and the printing sheet S conveyed by the impression cylinder 32. , Transferred to the surface of the printing sheet S. When the impression cylinder 32 rotates and the printing sheet S moves, the UV ink (oblique line) B of the semi-dried image moved together with the printing sheet S is completely dried by the ultraviolet light from the second UV lamp 36. It becomes UV ink (black coating) C.

  At this time, as shown in FIGS. 2 and 3, the image (UV ink) A formed on the surface of the blanket cylinder 31 is irradiated with ultraviolet rays from the first UV lamp 35 on one surface X side which is the surface side. The semi-dried image (UV ink) B is transferred so that the one surface X side is in close contact with the surface of the printing sheet S, and the image (UV ink) transferred to the surface of the printing sheet S is transferred. ) B is actually dried by irradiating ultraviolet rays from the second UV lamp 36 to the other surface Y side which is the surface side.

  That is, in the image A of the UV ink sprayed from the inkjet head 34, the viscosity of the UV ink is low. The first UV lamp 35 irradiates the surface (one side X) of the image A on the blanket cylinder 31 with ultraviolet light so that the viscosity of the UV ink is semi-dried. Then, the semi-dried UV ink image B is transferred such that the highly viscous surface (one side X) is in close contact with the surface of the printing sheet S. Therefore, the image B of the UV ink transferred to the surface of the printing sheet S becomes the other surface Y having a low viscosity, and the second UV lamp 36 emits ultraviolet light on the other surface Y with respect to the image B on the printing sheet S. Is dried until the UV ink is cured.

  Thereafter, the printing sheet S printed by the printing device 13 is sent out from the printing device 13 to the paper discharge device 14, and the chain gripper 28 conveys the print sheet S while holding the leading end portion thereof, and the paper discharge table 29. Stack up.

  As described above, in the offset sheet-fed printing press according to the first embodiment, the rotatable impression cylinder 32 can be rotated in synchronization with the impression cylinder 32 and the printing sheet can be rotated between the impression cylinder 32. A blanket cylinder 31 that can be transported across S, an inkjet head 34 that forms an image by spraying UV ink on the surface of the blanket cylinder 31, and UV ink of an image formed on the surface of the blanket cylinder 31 by the inkjet head 34 A first UV lamp 35 for primary drying and a second UV lamp 36 for secondary drying of the UV ink of the image transferred from the blanket cylinder 31 to the printing sheet S are provided.

  Therefore, the UV ink of the image formed on the surface of the blanket cylinder 31 by the ink jet head 34 is first dried by the first UV lamp 35 and then transferred to the printing sheet S. Therefore, printing is performed from the blanket cylinder 31 with a high viscosity. As a result, the UV ink does not penetrate into the printing sheet S, and as a result, the printing accuracy can be improved. Specifically, it is possible to improve the dot gain stability by improving the viscosity of the ink, to prevent the ink from bleeding, and to suppress the difference depending on the paper type.

  Further, in the offset sheet-fed printing press of Example 1, the image formed on the surface of the blanket cylinder 31 is primarily dried by irradiating ultraviolet light from one surface side which is the surface side, and one surface side Is transferred so as to be in close contact with the surface of the printing sheet S, and the image transferred to the surface of the printing sheet is subjected to secondary drying by irradiating ultraviolet light from the other side which is the surface side. Therefore, it is possible to appropriately dry the UV ink as an image.

  In the offset sheet-fed printing press of Example 1, the first UV lamp 35 is used to irradiate the image formed on the surface of the blanket cylinder 31 with ultraviolet light so that the viscosity of the UV ink is increased. The second UV lamp 36 irradiates the image transferred to the printing sheet S with ultraviolet light, and finally dries until the UV ink is cured. Therefore, the image which has been primarily dried and has increased adhesiveness can be appropriately transferred to the surface of the print sheet S, and the image of the print sheet S can be properly fixed.

  In the offset sheet-fed printing press according to the first embodiment, the cleaning roller 37 for cleaning the surface of the blanket cylinder 31 is provided after the image formed on the surface of the blanket cylinder 31 is transferred to the printing sheet S. Therefore, the printing quality can be improved by removing the ink remaining on the blanket cylinder 31.

  FIG. 4 is a schematic configuration diagram illustrating a sheet-fed printing press including a printing apparatus according to the second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 4, the offset sheet-fed printing press according to this embodiment includes a paper feeding device 41, a transport device 42, a printing device 43, and a paper discharge device 44.

  The paper feeding device 41 includes a paper feeding table 51 and a separator device 52 as a paper feeding mechanism. The paper feed tray 51 stacks and places the print sheets S, and the separator device 52 picks up and sends out a large number of print sheets S stacked on the paper feed stand 51 one by one from the top. Is. In this case, the paper feed table 51 can be moved up and down in response to the supply of the printing sheet S so that the separator device 52 can maintain the positional relationship with the printing sheet S at a substantially constant height.

  The conveying device 42 conveys the printing sheet S sent out from the paper feeding device 41 and positions it at a predetermined position, and supplies it to the printing device 43. In this conveying device 42, a feed roller 53 and a gripping roller 54 are disposed in contact with each other adjacent to the paper feeding device 41, and a conveying belt 56 wound around a plurality of guide rollers 55 is disposed for printing. A front pad 57 is disposed adjacent to the device 43.

  The printing apparatus 43 includes four printing units 61, 62, 63, corresponding to four colors of black, black, magenta, and yellow so that color printing can be realized. 64 and a printing unit 65 that performs printing using an inkjet head described later. Each of the printing units 61, 62, 63, and 64 has substantially the same configuration, and includes an inking device (not shown), plate cylinders 61a, 62a, 63a, and 64a, blanket cylinders 61b, 62b, 63b, and 64b, and an impression cylinder 61c. , 62c, 63c, 64c. The plate cylinders 61a, 62a, 63a, 64a, the blanket cylinders 61b, 62b, 63b, 64b and the impression cylinders 61c, 62c, 63c, 64c are in contact with each other in this order from the upper side to the lower side along the vertical direction. The ink is supplied to the blanket cylinders 61b, 62b, 63b, 64b via the plate cylinders 61a, 62a, 63a, 64a by the inking device, and the blanket cylinders 61b, 62b, 63b, 64b and the impression cylinders 61c, 62c are supplied. , 63c, 64c, the ink (printed image) is transferred from the blanket cylinders 61b, 62b, 63b, 64b to the print sheet S. An intermediate drum 66 is provided between the pressure drums 61c, 62c, 63c, and 64c.

  Further, the printing unit 65 has substantially the same configuration as the printing apparatus 13 described in the first embodiment. That is, the blanket cylinder 31 and the impression cylinder (printing cylinder) 32 are rotatably supported in contact with each other, and the intermediate cylinder 66 is rotatably supported in contact with the impression cylinder 32. The impression cylinder 32 and the intermediate cylinder 66 each have a gripping claw (not shown), and the gripping claw of the intermediate cylinder 66 grasps and conveys the leading end portion of the printing sheet S. The claw grips and conveys the leading end portion of the print sheet S released by the claw of the intermediate cylinder 66.

  Around the outer periphery of the blanket cylinder 31, there is provided an inkjet head 34 that forms an image by spraying UV ink on the surface of the blanket cylinder 31. In addition, the UV ink of the image formed on the surface of the blanket cylinder 31 by the inkjet head 34 is primarily dried around the outer periphery of the blanket cylinder 31 on the downstream side of the inkjet head 34 in the rotation direction of the blanket cylinder 31. A 1UV lamp 35 is provided. Further, two UV inks of an image transferred from the blanket cylinder 31 to the printing sheet S are disposed on the outer periphery of the impression cylinder 32 at a position downstream of the contact position with the blanket cylinder 31 in the rotation direction of the impression cylinder 32. A second UV lamp 36 for subsequent drying is provided.

  The blanket cylinder 31 is located on the outer periphery of the blanket cylinder 31 at a position downstream of the contact position with the impression cylinder 32 in the rotational direction of the blanket cylinder 31 and upstream of the inkjet head 34 in the rotational direction of the blanket cylinder 31. A cleaning roller 37 is provided as a cleaning device for cleaning the surface of the blanket cylinder 31 after the image formed on the surface of the cylinder 31 is transferred to the printing sheet S.

  The paper discharge device 44 conveys the print sheets S printed by the printing device 43 and stacks them up and down in an aligned state. The paper discharge device 44 includes a chain gripper 71 that conveys the print sheet S, a paper discharge base 72 on which the printed print sheets S are stacked, and a paper pad 73 that aligns the print sheets S. The chain gripper 71 has a plurality of gripping claws 71 a that grip the leading end of the printing sheet S, receives the printing sheet S from the impression cylinder 32 of the printing apparatus 43, and conveys the printing sheet S to a predetermined position above the paper discharge table 72. To do. The discharge table 72 is lowered continuously or stepwise so that the drop distance of the print sheet S becomes substantially constant when the height of the top surface of the uppermost stage rises as the print sheets S are stacked. It is possible. The paper pad 73 regulates the leading end position in the traveling direction of the printing sheet S.

  Here, the printing method by the offset sheet-fed printing press of the present Example comprised in this way is demonstrated.

  First, the print sheets S stacked on the paper feed tray 51 of the paper feed device 41 are picked up one by one from the top by the separator device 52 and sent to the transport device 42. Next, the transport device 42 After the sheets S are positioned by the front pads 57, they are sequentially supplied to the printing device 43.

  Subsequently, the four printing units 61, 62, 63, and 64 print the four colors of black, indigo, red, and yellow on the printing sheet S in the printing apparatus 43. At this time, each of the printing units 61, 62, 63, and 64 performs printing on a portion excluding the predetermined area, and the printing unit 65 performs printing on the predetermined area of the blank paper.

  That is, in the printing unit 65, the inkjet head 34 sprays UV ink toward the blanket cylinder 31 to form a predetermined image on the surface of the blanket cylinder 31. The image moving with the rotation of the blanket cylinder 31 is primarily dried, that is, semi-dried by the ultraviolet light from the first UV lamp 35. On the other hand, the intermediate cylinder 66 receives the print sheet S sent out from the conveying device 42 and transfers it to the impression cylinder 32. When the printing sheet S is conveyed to the impression cylinder 32 and passes through the blanket cylinder 31 while being pressed, the image on the blanket cylinder 31 is transferred to the printing sheet S. Thereafter, the image moving with the rotation of the impression cylinder 32 is subjected to secondary drying, that is, main drying by ultraviolet light from the second UV lamp 36.

  The blanket cylinder 31 having the image transferred to the printing sheet S on the surface comes into contact with the cleaning roller 37, so that the UV ink remaining on the surface is removed.

  Thereafter, the printing sheet S printed by the printing device 43 is sent out from the printing device 43 to the paper discharge device 44, and the chain gripper 71 conveys the paper sheet S while holding the leading end of the print sheet S, and the paper discharge table 72. Stack up.

  As described above, in the offset sheet-fed printing press according to the second embodiment, the printing unit 65 is disposed on the downstream side of the printing units 61, 62, 63, and 64 for four-color printing. A rotatable impression cylinder 32, a blanket cylinder 31 that can be rotated synchronously in contact with the impression cylinder 32, and can be conveyed with the printing sheet S sandwiched between the impression cylinder 32, and the surface of the blanket cylinder 31 An inkjet head 34 for spraying UV ink onto the surface, a first UV lamp 35 for primarily drying the UV ink of the image formed on the surface of the blanket cylinder 31 by the inkjet head 34, and the blanket cylinder 31 to the printing sheet S. A second UV lamp 36 for secondary drying the UV ink of the transferred image is provided.

  Accordingly, in the printing unit 65, the UV ink of the image formed on the surface of the blanket cylinder 31 by the inkjet head 34 is primarily dried by the first UV lamp 35 and then transferred to the printing sheet S, so that the viscosity is increased. In this state, the blanket cylinder 31 is transferred to the printing sheet S, and the UV ink does not penetrate into the printing sheet S. As a result, it is possible to improve the printing accuracy. Specifically, it is possible to improve the dot gain stability by improving the viscosity of the ink, to prevent the ink from bleeding, and to suppress the difference depending on the paper type.

  FIG. 5 is a schematic configuration diagram illustrating a rotary printing press including a printing apparatus according to a third embodiment of the present invention.

  The offset rotary printing press of Example 3 is a rotary printing press using water-based ink (or water-soluble ink), and as shown in FIG. 5, a paper feeding device 81, an infeed device 82, and a printing device. 83, a drying device 84, a cooling device 85, a web pass device 86, a folding device 87, and a paper discharge device 88.

  The paper feeding device 81 has a reel stand on which two winding bodies (web rolls) are mounted. The web (printing medium) W that is drawn out from one winding body and travels is transferred to the other winding body (web roll). By connecting to the web of the winding body, it has a paper splicing device that can continuously supply the web. The infeed device 82 supplies the web W of the paper feeding device 81 to the printing device 83 side.

  The printing apparatus 83 includes four printing units 91, 92, 93, and 94 for four water-based ink colors, black, indigo, red, and yellow, and a printing unit 95 that performs printing using an inkjet head described later. It is arranged side by side along the traveling direction. Each printing unit 91, 92, 93, 94 is a double-sided printing machine that prints on the front and back surfaces of the web W at the same time, and only the color of the water-based ink (black, indigo, red, yellow) is different. The configuration is almost the same. That is, each printing unit 91, 92, 93, 94 is rotatably supported by an ink fountain, an ink base roller, a delivery roller, a kneading roller, a reciprocating roller, an ink application roller, a plate cylinder, and a blanket cylinder in series. The configuration is arranged symmetrically in the vertical direction. Then, when the web W passes between the opposing blanket cylinders, ink (printed image) is transferred from each blanket cylinder to the front and back of the web W.

  Further, the printing unit 95 has substantially the same configuration as the printing apparatus 13 described in the first embodiment. That is, the upper blanket cylinder 101 and the lower blanket cylinder 102 are rotatably supported in contact with each other up and down, and the web W is sandwiched and conveyed between the blanket cylinders 101 and 102. In this embodiment, since the printing unit 95 is a double-sided printing machine, the blanket cylinder 102 is the printing cylinder of the present invention for the blanket cylinder 101, and the blanket cylinder 101 functions as the printing cylinder of the present invention for the blanket cylinder 102. To do.

  In the outer periphery of the blanket cylinders 101 and 102, inkjet heads 103 and 104 for forming images by spraying UV ink on the surfaces of the blanket cylinders 101 and 102 are provided. Further, the outer periphery of the blanket cylinders 101 and 102 is positioned on the downstream side of the inkjet heads 103 and 104 in the rotational direction of the blanket cylinders 101 and 102, and is formed on the surface of the blanket cylinders 101 and 102 by the inkjet heads 103 and 104. First UV lamps 105 and 106 for primarily drying the UV ink of the printed image are provided. Further, second UV lamps 107 for secondarily drying the UV ink of the image transferred from the blanket cylinders 101, 102 to the web W, located downstream of the contact position of the blanket cylinders 101, 102 in the conveyance direction of the web W. 108 is provided.

  Further, on the outer periphery of the blanket cylinders 101 and 102, the blanket cylinders 101 and 102 are located downstream in the rotation direction of the blanket cylinders 101 and 102 and upstream of the inkjet heads 103 and 104 in the rotation direction of the blanket cylinders 101 and 102. Cleaning rollers 109 and 110 are provided as cleaning devices for cleaning the surfaces of the blanket cylinders 101 and 102 after the images formed on the surfaces of the 101 and 102 are transferred to the web W.

  The drying device 84 is for drying the water-based ink on the web printed by the printing device 83, and the cooling device 85 appropriately uses the web W that stores excessive heat after drying in the drying device 84. It cools to a certain temperature. The web pass device 86 conveys the dried and cooled web W, and the folding device 87 cuts the web W after being vertically folded and folds it to a predetermined size to form a fold. The paper discharge device 88 is for carrying out the folded signatures out of the apparatus.

  Here, the printing method by the rotary offset printing press of the present Example comprised in this way is demonstrated.

  First, the roll-shaped web W is pulled out from the winding body by the paper feeding device 81 and supplied to the printing device 83 by the infeed device 82. Subsequently, the four printing units 91, 92, 93, and 94 print four colors of black, indigo, red, and yellow on the web W by the printing device 83. At this time, each of the printing units 91, 92, 93, and 94 performs printing on a portion excluding the predetermined area, and the printing unit 95 performs printing on the predetermined area of the blank paper.

  That is, in the printing unit 95, the inkjet heads 103 and 104 spray UV ink toward the blanket cylinders 101 and 102, thereby forming a predetermined image on the surfaces of the blanket cylinders 101 and 102. The images that move as the blanket cylinders 101 and 102 rotate are primarily dried, that is, semi-dried by the ultraviolet light from the first UV lamps 105 and 106. When the web W passes between the blanket cylinders 101 and 102 while being pressed, the images of the blanket cylinders 101 and 102 are transferred to the web W. Thereafter, the image on the web W that moves with the rotation of the blanket cylinders 101 and 102 is subjected to secondary drying, that is, main drying, by the ultraviolet light from the second UV lamps 107 and 108.

  The blanket cylinders 101 and 102 on which the image is transferred to the web W come into contact with the cleaning rollers 109 and 110, so that the UV ink remaining on the surface is removed.

  Thereafter, the web W printed by the printing device 83 is sent from the printing device 83 to the drying device 84, where the water-based ink is dried, cooled by the cooling device 85, and conveyed through the web pass device 86. A fold is created by the folding device 87 and carried out by the paper discharge device 88.

  As described above, in the rotary offset printing press according to the third embodiment, the printing unit 95 is disposed on the downstream side of the printing units 91, 92, 93, and 94 for four-color printing. Blanket cylinders 101 and 102 that can be rotated synchronously in contact with each other and can be conveyed with the web W interposed therebetween, and inkjet heads 103 and 104 that form images by spraying UV ink on the surfaces of the blanket cylinders 101 and 102. The first UV lamps 105 and 106 for primarily drying the UV ink of the image formed on the surfaces of the blanket cylinders 101 and 102 by the inkjet heads 103 and 104, and the UV of the image transferred from the blanket cylinders 101 and 102 to the web W. Second UV lamps 107 and 108 for secondary drying of ink are provided.

  Therefore, the UV ink of the image formed on the surface of the blanket cylinder 101, 102 by the inkjet heads 103, 104 in the printing unit 95 is transferred to the web W after being primarily dried by the first UV lamps 105, 106. The UV ink is transferred from the blanket cylinders 101 and 102 to the web W in a state where the viscosity of the UV ink is increased, and the UV ink does not penetrate into the web W. As a result, the printing accuracy can be improved. Specifically, it is possible to improve the dot gain stability by improving the viscosity of the ink, to prevent the ink from bleeding, and to suppress the difference depending on the paper type.

  FIG. 6 is a schematic configuration diagram illustrating a rotary printing press including a printing apparatus according to a fourth embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  The offset rotary printing press of Example 4 is a rotary printing press using water-based ink (or water-soluble ink), and as shown in FIG. 6, a paper feeding device 81, an infeed device 82, and a printing device. 83, a drying device 84, a cooling device 85, a web pass device 86, and a sheeter 89.

  The paper feeding device 81 has a reel stand on which two winding bodies (web rolls) are mounted. The web (printing medium) W that is drawn out from one winding body and travels is transferred to the other winding body (web roll). By connecting to the web of the winding body, it has a paper splicing device that can continuously supply the web. The infeed device 82 supplies the web W of the paper feeding device 81 to the printing device 83 side.

  The printing apparatus 83 includes five printing units 91, 92, 93, 94, and 95 arranged in parallel along the web traveling direction. Each printing unit 91, 92, 93, 94 is a double-sided printing machine that simultaneously prints on the front and back surfaces of the web W. The printing unit 95 has the same configuration as that described in the third embodiment.

  The drying device 84 is for drying the water-based ink on the web printed by the printing device 83, and the cooling device 85 appropriately uses the web W that stores excessive heat after drying in the drying device 84. It cools to a certain temperature. The web pass device 86 conveys the dried and cooled web W. The sheeter 89 cuts the web W by a predetermined length, stacks it, and discharges it.

  Note that the printing method by the offset rotary printing press of the present embodiment is the same as that of the printing apparatus 83 except that the processing of the web W after printing is different.

  As described above, in the rotary offset printing press according to the fourth embodiment, the printing unit 95 is disposed on the downstream side of the printing units 91, 92, 93, and 94 for four-color printing. Blanket cylinders 101 and 102 that can be rotated synchronously in contact with each other and can be conveyed with the web W interposed therebetween, and inkjet heads 103 and 104 that form images by spraying UV ink on the surfaces of the blanket cylinders 101 and 102. The first UV lamps 105 and 106 for primarily drying the UV ink of the image formed on the surfaces of the blanket cylinders 101 and 102 by the inkjet heads 103 and 104, and the UV of the image transferred from the blanket cylinders 101 and 102 to the web W. Second UV lamps 107 and 108 for secondary drying of ink are provided.

  Therefore, the UV ink of the image formed on the surface of the blanket cylinder 101, 102 by the inkjet heads 103, 104 in the printing unit 95 is transferred to the web W after being primarily dried by the first UV lamps 105, 106. The UV ink is transferred from the blanket cylinders 101 and 102 to the web W in a state where the viscosity of the UV ink is increased, and the UV ink does not penetrate into the web W. As a result, the printing accuracy can be improved. Specifically, it is possible to improve the dot gain stability by improving the viscosity of the ink, to prevent the ink from bleeding, and to suppress the difference depending on the paper type.

  In the third and fourth embodiments, the printing apparatus 83 (printing units 91, 92, 93, 94, and 95) has been described as a double-sided printing machine, but may be a single-sided printing machine.

  In each of the above-described embodiments, the print medium is the print sheet S or the web W as a sheet, but is not limited to the print paper, and may be a resin film, a glass sheet, or the like.

  The printing apparatus and printing method, and the sheet-fed printing press and rotary printing press according to the present invention perform printing by first transferring the ultraviolet curable ink of the image formed on the blanket cylinder by an inkjet head to a printing medium, and then transferring it to a printing medium. It is intended to improve accuracy and can be applied to any printing machine such as offset, gravure, flexo and the like.

1 is a schematic configuration diagram illustrating a sheet-fed printing press including a printing apparatus according to Embodiment 1 of the present invention. FIG. 2 is a schematic diagram illustrating a main part of the printing apparatus according to the first embodiment. FIG. 3 is a schematic diagram illustrating an image transfer state in the printing apparatus according to the first exemplary embodiment. It is a schematic block diagram showing the sheet-fed printing press provided with the printing apparatus which concerns on Example 2 of this invention. It is a schematic block diagram showing the rotary printing machine provided with the printing apparatus which concerns on Example 3 of this invention. It is a schematic block diagram showing the rotary printing press provided with the printing apparatus which concerns on Example 4 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11,41 Paper feeder 12,42 Conveyor 13,43 Printing device 14,44 Paper discharge device 31 Blanket cylinder 32 Impression cylinder (printing cylinder)
34 Inkjet head 35 First UV lamp (first ultraviolet irradiation device)
36 2nd UV lamp (2nd UV irradiation device)
37 Cleaning roller (cleaning device)
65 Printing unit (printing device)
DESCRIPTION OF SYMBOLS 81 Paper feeder 82 In-feed device 83 Printing device 84 Drying device 85 Cooling device 86 Web pass device 87 Folding device 88 Paper discharge device 89 Sheeter 95 Printing unit (printing device)
101,102 Blanket cylinder (printing cylinder)
103, 104 Inkjet head 105, 106 First UV lamp (first ultraviolet irradiation device)
107, 108 Second UV lamp (second ultraviolet irradiation device)
109,110 Cleaning roller (cleaning device)

Claims (7)

A rotatable printing cylinder;
A blanket cylinder capable of rotating synchronously in contact with the printing cylinder and capable of being conveyed while sandwiching a print medium with the printing cylinder;
An inkjet head that forms an image by spraying ultraviolet curable ink on the surface of the blanket cylinder;
A first ultraviolet irradiation device for primarily drying the ultraviolet curable ink of the image formed on the surface of the blanket cylinder by the inkjet head;
A second ultraviolet irradiation device for secondary drying the ultraviolet curable ink of the image transferred from the blanket cylinder to the printing medium;
A printing apparatus comprising:   The image formed on the surface of the blanket cylinder is irradiated with ultraviolet rays from one side which is the surface side and is primarily dried, and is transferred so that the one side is in close contact with the surface of the print medium. 2. The printing apparatus according to claim 1, wherein the image transferred to the surface of the first image is subjected to secondary drying by irradiation with ultraviolet rays from the other surface side which is the surface side thereof.   The first ultraviolet irradiation device irradiates the image formed on the surface of the blanket cylinder with ultraviolet rays to semi-dry the ultraviolet curable ink so that the viscosity of the ultraviolet curable ink is increased. 3. The printing apparatus according to claim 1, wherein the image transferred to the medium is irradiated with ultraviolet rays and finally dried until the ultraviolet curable ink is cured.   The cleaning device for cleaning the surface of the blanket cylinder after the image formed on the surface of the blanket cylinder is transferred to a printing medium is provided. Printing device.   An image is formed by spraying ultraviolet curable ink on the surface of the rotating blanket cylinder, and the ultraviolet curable ink of the image formed on the surface of the blanket cylinder is irradiated with ultraviolet rays to be primarily dried, and on the surface of the blanket cylinder. The UV-curable ink of the primary dried image is transferred to a print medium that is sandwiched between the printing cylinder that is synchronously rotated in contact with the image, and is transferred to the UV-curable ink of the image transferred to the print medium. The printing method characterized by performing secondary drying by irradiation. A paper feeding device that sucks and feeds the sheets stacked on the paper feeding table;
A printing device that conveys a sheet fed from the sheet feeding device between a printing cylinder and a blanket cylinder and transfers the image formed on the blanket cylinder to the sheet, and performs printing;
In a sheet-fed printing machine comprising a sheet discharge device that stacks and discharges sheets printed on the printing apparatus on a sheet discharge table,
The printing apparatus includes:
An inkjet head that forms an image by spraying ultraviolet curable ink on the surface of the blanket cylinder;
A first ultraviolet irradiation device for primarily drying the ultraviolet curable ink of the image formed on the surface of the blanket cylinder by the inkjet head;
A second ultraviolet irradiation device for secondary drying the ultraviolet curable ink of the image transferred from the blanket cylinder to the sheet;
A sheet-fed printing machine comprising: A paper feeding device for feeding a web from a web,
A printing apparatus that conveys a web fed out from the paper feeding apparatus between a printing cylinder and a blanket cylinder and transfers an image formed on the blanket cylinder to the web to perform printing; and
A drying device for drying the web printed by the printing device;
A folding device for forming a signature by cutting and folding the web dried by the drying device;
In a rotary printing press provided with a paper discharge device that discharges the signature formed by the folding device,
The printing apparatus includes:
An inkjet head that forms an image by spraying ultraviolet curable ink on the surface of the blanket cylinder;
A first ultraviolet irradiation device for primarily drying the ultraviolet curable ink of the image formed on the surface of the blanket cylinder by the inkjet head;
A second ultraviolet irradiation device for secondary drying the ultraviolet curable ink of the image transferred from the blanket cylinder to the web;
A rotary printing press characterized by comprising:

Images