JP2008207369A - Printing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a printing machine, which performs nearly uniform widthwise treatment and prevents poor printing such as poor partial curing of ultraviolet curing material or the like from developing. <P>SOLUTION: In this sheet-fed press 1, in which UV ink is transferred to a sheet 13 to be carried and is cured by irradiating the sheet 13 with light including ultraviolet rays sent from an UV drier 33, the UV drier 33 is so constituted as to form a widthwise nearly uniform irradiating region 61 by combining a plurality of members of UV emitting diodes 53 irradiating the light including the ultraviolet rays so correlating the irradiating regions 61 of the diodes 53 with each other. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to a printing press.

In recent printing presses, ultraviolet curable ink (UV ink) that does not require a solvent is used as an ink because of good drying properties and environmental problems.
As a light source for drying the UV ink, a metal halide lamp, a high-pressure mercury lamp, a xenon lamp, or the like is used.
However, these have the following problems. That is, it has a short life and requires frequent replacement. Moreover, since the calorific value is large, a cooling means is required, and the apparatus becomes large. Furthermore, this makes it difficult to secure space and increases costs.
In order to improve this, for example, as shown in Patent Document 1, a device using a light emitting diode (LED) as a light source has been proposed.

JP 2005-238562 A

By the way, since one LED is limited to a narrow irradiation area where an effective illuminance can be obtained, there is a risk that a portion where the irradiation area varies in the width direction and the UV ink is not cured by simply arranging them. was there.
In particular, in order to prevent uncured portions with the recent increase in printing speed, it is further required to secure a substantially uniform irradiation region with little variation in the width direction.

  In view of the above problems, an object of the present invention is to provide a printing machine that can perform substantially uniform processing in the width direction and can prevent defective printing such as partial curing failure of an ultraviolet curable material.

In order to solve the above problems, the present invention employs the following means.
That is, a printing machine according to the present invention is a printing machine that transfers an ultraviolet curable material to a transported print medium and irradiates the print medium with ultraviolet light from a light source device to cure the ultraviolet curable material. The light source device is configured such that a plurality of light emitting diodes that irradiate light including ultraviolet rays are combined so that their irradiation regions are related to each other, and a substantially uniform irradiation region is formed in the width direction. Yes.

In the printing machine according to the present invention, the ultraviolet curable material is cured by irradiating the print medium with light including ultraviolet rays from a plurality of light emitting diodes constituting the light source device onto the print medium on which the ultraviolet curable material is transferred and conveyed.
As described above, since the light-emitting diode that is compact and generates little heat is used as the light source, the cooling means may be unnecessary, and the light source device can be downsized and installed in a small space. Further, it is possible to suppress the risk of deformation or distortion of the print medium due to the amount of heat.
At this time, the light source device is combined so that the irradiation regions of the plurality of light emitting diodes are related to each other, and forms a substantially uniform irradiation region in the width direction. It is possible to irradiate substantially uniform ultraviolet rays in the direction.
Therefore, since the ultraviolet curable material on the printing medium is cured substantially uniformly in the width direction, printing defects such as partial curing defects of the ultraviolet curable material can be prevented.
Note that the print medium is paper, resin, or the like, and may be in a sheet form or continuous.
Further, the ultraviolet curable material is cured by ultraviolet rays, and targets UV ink, UV varnish (coating liquid), UV paint, UV adhesive, and the like.

  In the printing press according to the present invention, the light source device includes a plurality of the light emitting diodes arranged in a crossing direction intersecting a traveling direction of the print medium, and a reflecting surface of the irradiation light irradiated from these light emitting diodes. A reflection member is provided so as to surround the irradiation path individually or collectively, and the reflection surfaces facing the traveling direction are separated by a predetermined distance or more.

As described above, since the reflecting member is provided with the reflection surface so as to surround the irradiation path of the irradiation light irradiated from the light emitting diodes arranged in the intersecting direction, the irradiation light irradiated from each light emitting diode is reflected. The light is reflected by the surface and is irradiated substantially uniformly in the region surrounded by the reflective surface.
At this time, since the reflecting surfaces facing in the traveling direction are separated by a predetermined distance or more, the irradiation area can be ensured by a predetermined distance or more in the width direction, and printing defects such as a partial curing defect of the ultraviolet curable material. Can be prevented.
In this case, in order to irradiate the ultraviolet curable material transferred to the printing medium with substantially uniform ultraviolet rays in the width direction, it is preferable that the opposing reflecting surfaces be substantially parallel.
Of course, the cross direction includes the width direction.

  In the printing press according to the present invention, the light source device includes a plurality of light emitting diodes arranged in a crossing direction intersecting a traveling direction of the printing medium, and a plurality of light emitting diodes are provided in the traveling direction, and light emission in adjacent rows is performed. The diodes are arranged in a staggered pattern.

In this way, a plurality of light emitting diodes arranged in the intersecting direction are provided in a plurality of rows in the traveling direction of the print medium, and the light emitting diodes in adjacent rows are arranged in a staggered manner, so that the adjacent light emitting diodes in one row The irradiation regions of the light emitting diodes in the other columns are located in an insufficient portion of the irradiation region generated between the two.
For this reason, since the light source device can secure an irradiation region of approximately a predetermined distance or more in the traveling direction along the intersecting direction, the irradiation region can be ensured by a predetermined distance or more in the width direction, and the ultraviolet curing material is partially cured. Printing defects such as defects can be prevented.
In this case, by setting the overlapping degree of the staggered arrangement appropriately, it is possible to irradiate the ultraviolet curable material transferred to the printing medium with substantially uniform ultraviolet rays in the width direction.

  Further, in the printing press according to the present invention, the light source device includes a plurality of the light emitting diodes arranged in a crossing direction intersecting a traveling direction of the print medium, and the light emitting diodes on the one point side with respect to a certain point. The light emitting diodes that are inclined toward and away from the one point are inclined more greatly.

In this way, the light source device has a plurality of light emitting diodes arranged in a crossing direction that intersects the traveling direction of the print medium, and the light emitting diodes are tilted toward one point with a certain point as a center, and are separated from one point. Since the light emitting diode is inclined more greatly, the irradiation regions of the light emitting diodes adjacent in the width direction can be partially overlapped.
For this reason, since the light source device can secure an irradiation region of approximately a predetermined distance or more in the traveling direction along the intersecting direction, the irradiation region can be ensured by a predetermined distance or more in the width direction, and the ultraviolet curing material is partially cured. Printing defects such as defects can be prevented.
In this case, it is possible to irradiate the ultraviolet curable material transferred to the printing medium with substantially uniform ultraviolet rays in the width direction by appropriately tilting each light emitting diode.

According to the present invention, since a light-emitting diode that is compact and generates little heat is used as the light source, the cooling means may be unnecessary, and the light source device can be downsized and installed in a small space. Further, it is possible to suppress the risk of deformation or distortion of the print medium due to the amount of heat.
In addition, the light source device is combined so that the irradiation areas of a plurality of light emitting diodes are related to each other, and forms a substantially uniform irradiation area in the width direction. It is possible to irradiate substantially uniform ultraviolet rays.
Therefore, since the ultraviolet curable material on the printing medium is cured substantially uniformly in the width direction, printing defects such as partial curing defects of the ultraviolet curable material can be prevented.

Embodiments according to the present invention will be described below with reference to the drawings.
[First embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a front view showing an overall schematic configuration of a sheet-fed printing machine (printing machine) 1.
The sheet-fed printing machine 1 includes a sheet feeding device 3, a plurality of printing units 5, a cylinder extension unit 7, and a coating unit 9 from an upstream side to a downstream side to which a sheet to be printed is supplied. And a paper discharge device 11.
The paper feeding device 3 picks up and supplies the sheets (printing media) 13 stacked on the paper feed tray 15 one by one from the top by a paper feeding mechanism (paper suction, cam, etc.) not shown. is there.
The paper feed table 15 is configured to move up in response to the supply of the sheet 13 so that the paper feed mechanism maintains a substantially constant positional relationship with the sheet 13.

A plurality of printing units 5 are provided for each color to be printed. In the present embodiment, a five-color machine for printing with five colors is shown, and five printing units 5 are provided. The five colors include, for example, a combination of C (cyan), M (magenta), Y (yellow), and BL (black) process ink and one special color ink.
As these inks, oil-based inks or UV inks (ultraviolet curable materials) having different vehicle components other than pigments are used in accordance with applications. UV ink is cured by being irradiated with ultraviolet rays.

  Each printing unit 5 includes an inking device (not shown) for supplying ink, a dampening device (not shown) for supplying dampening water, and a plate cylinder 17 disposed opposite to the inking device and the dampening device. A blanket cylinder 19 disposed opposite to the plate cylinder 17, an impression cylinder 21 disposed opposite to the blanket cylinder 19, and an intermediate cylinder 23 disposed between the impression cylinders 21 of the printing units 5 are provided. Yes. Each of these cylinders is rotatably supported by the frame of the sheet-fed printing press 1.

The plate cylinder 17 has a cylindrical shape in which a printing plate on which a printing image is formed is wound around the outer periphery. A printing plate is created and exchanged for each image to be printed.
The blanket cylinder 19 receives the ink on the printing plate of the plate cylinder 17 and transfers the ink to the sheet 13 passing between the impression cylinder 21 (offset printing). A blanket formed of an elastic material such as rubber is wound around the outer peripheral surface of the blanket cylinder 19.
The blanket cylinder 19 is configured to be separated from the plate cylinder 17 and the impression cylinder 21 when printing is not performed or the like.

The impression cylinder 21 is disposed opposite to the blanket cylinder 19 and has a cylindrical shape. The impression cylinder 21 has a so-called double cylinder finishing having a diameter twice that of the plate cylinder 17 and the blanket cylinder 19.
A claw device (not shown) for holding the front end of the sheet 13 is attached to the circumferential surface of the impression cylinder 21 at two locations across the axis center.
The impression cylinder 21 contacts the blanket cylinder 19 via the sheet 13 during printing, and applies a desired pressure to the sheet 13 supplied between the impression cylinder 21 and the blanket cylinder 19. As a result, the ink on the blanket cylinder 19 is transferred onto the sheet 13.

The intermediate cylinder 23 is provided between the impression cylinders 21 of the printing units 5. As shown in FIG. 1, except for the cylindrical body on the side of the sheet feeding device 3, the intermediate cylinder 23 is attached to both end portions of a support portion 27 attached to both end portions in the width direction of the shaft 25. In this structure, a claw device 29 for holding the tip of the paper is attached, that is, a skeleton type having no body surface in contact with the sheet 13.
The movement trajectory of the claw device 29 indicated by a two-dot chain line in FIG. 1 is a so-called double cylinder finishing having a diameter twice that of the plate cylinder 17 and the blanket cylinder 19.
The sheet 13 is sent from the upstream impression cylinder 21 to the downstream impression cylinder 21 by the intermediate cylinder 23.

Below the intermediate cylinder 23, a guide 31 is provided which has a shape substantially parallel to the movement trajectory of the claw device 29 and guides the sheet 13 conveyed by the intermediate cylinder 23.
Depending on the printing unit 5, a UV drying device (light source device) 33 for irradiating light including ultraviolet rays toward the impression cylinder 21 to cure the UV ink is attached.

The cylinder extension unit 7 is provided for installing a UV drying device 33 that irradiates light including ultraviolet rays and cures UV ink.
The cylinder extension unit 7 is provided with an intermediate cylinder 23 and a conveyance cylinder 22 for conveying the sheet 13.
The UV drying device 33 is installed above the conveyance cylinder 22 so as to face the sheet 13 conveyed by the conveyance cylinder 22.

The coating unit 9 applies a varnish for applying gloss to the printing surface of the sheet 13. As the varnish, an aqueous varnish or UV varnish (ultraviolet curable material) is used according to the application. The UV varnish is cured by being irradiated with ultraviolet rays.
In the coating unit 9, the sheet 13 is conveyed by the intermediate cylinder 23 and the impression cylinder 21 as in the printing unit 5.
The varnish stored in the varnish boat 35 is pumped up by a varnish roller 37 and supplied from a varnish roller 39 to a varnish plate wound around a plate cylinder 41. The varnish supplied to the varnish plate is transferred to a required position of the sheet 13 being conveyed by the engagement portion with the impression cylinder 21.

The paper discharge device 11 is provided with a chain gripper 43 and a paper discharge table 45.
The chain gripper 43 circulates between a position adjacent to the impression cylinder 21 of the coating unit 9 and an upper position of the paper discharge tray 45, a gripper bar connecting the chain, and a gap between the gripper bar. And an installed claw device, which receives the sheet 13 from the impression cylinder 21 and conveys it to a position above the sheet discharge table 45.

Inside the movement locus of the chain gripper 43, a UV drying device 33 for irradiating light including ultraviolet rays to cure the UV varnish and a drying device 47 for drying the aqueous varnish are provided. The UV drying device 33 and the drying device 47 are selectively used according to the type of varnish used in the coating unit 9.
As the drying device 47, a hot air sending device or an IR lamp is used.
The paper discharge table 45 is configured to be movable in the vertical direction, and stacks and holds the sheets 13 discharged from the chain gripper 43.
The paper discharge table 45 is controlled to gradually move down so that the fall distance of the sheet 13 becomes substantially constant.

Next, the UV drying apparatus 33 will be described with reference to FIGS.
FIG. 2 is a side view showing the overall schematic structure of the UV drying device 33. 3 is a cross-sectional view taken along the line XX of FIG. FIG. 4 is a schematic diagram showing an irradiation area on the sheet 13 of the UV drying device 33.
The UV drying device 33 includes a support member 51, a plurality of UV light emitting diodes (light emitting diodes) 53, and a reflecting member 55.
The support member 51 has a cylindrical shape and is attached so as to extend over the entire width in the width direction W of the sheet-fed printing press 1.
It should be noted that the axis center of the support member 51 may be inclined with respect to the width direction W, that is, along the intersecting direction intersecting with the traveling direction H of the paper surface, due to factors such as disposition.

Each of the plurality of UV light emitting diodes 53 has a substantially cylindrical shape, and employs a pen-type structure in which irradiation light from a plurality of light emitting diode elements provided inside the cylinder is collected by a condenser lens. The UV light emitting diode 53 is simply a portion of the support member 51 that faces the assumed path S of the sheet 13 (downward along the plane of the paper in FIG. 2; hereinafter, a portion that opposes the assumed path S of the sheet 13). Are sometimes attached to the longitudinal direction thereof, that is, in the width direction W which is a direction orthogonal to the sheet conveying direction.
Thus, since the light-emitting diode 53 that is compact and generates little heat is used, a cooling means may be unnecessary, and the UV drying device 33 can be downsized and installed in a narrow space. Further, it is possible to suppress the risk of deformation and distortion of the sheet 13 due to the amount of heat.

The irradiation light 57 of the UV light emitting diode 53 includes ultraviolet rays and is formed to diffuse to some extent.
The reflection member 55 is a quadrangular prism having a space elongated in the width direction W, and the upper part is fitted to the outer peripheral surface of the UV light emitting diode 53 and fixedly attached to the UV light emitting diode 53.
The lower end portion of the reflecting member 55 is positioned near the assumed path S of the sheet 13. At least the lower part of the inner surface of the reflecting member 55 is a reflecting surface 59 that reflects light. The reflecting surfaces 59 facing each other in the traveling direction H (see FIG. 3) of the sheet 13 are substantially parallel to each other, and the distance between them is substantially the same as the outer diameter of the UV light-emitting diode 53. It is smaller than the diameter of the region.

The irradiation light 57 emitted from each UV light emitting diode 53 hits the reflection surface 59 and is reflected to the internal space side of the reflection member 55. Thus, since the irradiation light 57 is not diffused outward from the internal space of the reflection member 55, the irradiation region 61 of the irradiation light 57 irradiated to the sheet 13 from the UV drying device 33 is as shown in FIG. It becomes a long and thin rectangle in which the internal space of the reflecting member 55 is projected.
That is, the UV drying device 33 forms an irradiation region 61 that is substantially uniform in the width direction and has a predetermined length in the traveling direction H.
If the amount of light in the irradiation region 61 is insufficient, a plurality of UV drying devices 33 may be provided along the traveling direction H.

The operation of the sheet-fed printing press 1 according to the above-described embodiment will be described.
The sheets 13 stacked on the sheet feeding table 15 of the sheet feeding device 3 are taken out one by one from the top by a sheet feeding mechanism (not shown) and supplied to the printing unit 5.
The supplied sheet 13 is added by the nail device 29 of the intermediate cylinder 23 of the printing unit 5, and then is transferred from the intermediate cylinder 23 to the nail device of the impression cylinder 21. This is repeated and conveyed through the five printing units 5.

In each printing unit 5, water is supplied from the dampening device to the non-image area of the printing plate attached to the peripheral surface of the plate cylinder 17, and then UV ink is supplied from the ink supply device to the image area of the printing plate. The
The printed image on the printing plate thus obtained is transferred to a blanket wound around the outer peripheral surface of the blanket cylinder 19.
The printed image transferred to the blanket is transferred to the sheet 13 that is carried by the nail device of the impression cylinder 21, and is printed in one color.

This is repeated in each printing unit 5 for color printing.
At this time, the UV drying device 33 installed in the printing unit 5 may irradiate light containing ultraviolet rays to cure a part of the UV ink. For example, irradiation is performed immediately after black, cyan, and white used for resin printing as a relatively slow curing speed are printed, and irradiation is performed by the subsequent cylinder extension unit 7. This enhances the adhesion between the ink and the sheet. This is particularly effective when the sheet 13 is a resin.
The color-printed sheet 13 is conveyed to the cylinder extension unit 7. In the cylinder extension unit 7, the printed UV ink is cured by being irradiated with light including ultraviolet rays by the UV drying device 33.

At this time, as shown in FIG. 4, the UV drying device 33 forms an irradiation region 61 that is substantially uniform in the width direction W and has a predetermined length in the traveling direction H, so that the UV ink is substantially in the width direction. It will be cured uniformly.
Accordingly, printing defects such as partial curing defects of UV ink can be prevented.

The sheet 13 from which the UV ink has been dried by the cylinder extension unit 7 is transferred to the intermediate cylinder 23 of the coating unit 9 and then transferred to the impression cylinder 21.
In the coating unit 9, the UV varnish stored in the varnish boat 35 is pumped up by the varnish roller 37 and transferred from the varnish roller 39 to the convex surface of the varnish plate attached to the surface of the plate cylinder 41. The UV varnish transferred to the varnish plate is transferred to a predetermined position on the printing surface of the sheet 13 supported and conveyed by the outer peripheral surface of the impression cylinder 21.

The sheet 13 to which the UV varnish has been transferred by the coating unit 9 is transferred from the impression cylinder 21 to the chain gripper 43 and conveyed by the chain gripper 43.
The sheet 13 is irradiated with light including ultraviolet rays by the UV drying device 33 in the middle to cure the UV varnish.
At this time, as shown in FIG. 4, the UV drying device 33 forms an irradiation region 61 that is substantially uniform in the width direction W and has a predetermined length in the traveling direction H. Therefore, the UV varnish is substantially in the width direction. It will be cured uniformly.
Therefore, printing defects such as partial curing defects of UV varnish can be prevented.

Then, the sheet 13 whose surface UV varnish has been dried by the UV drying device 33 is conveyed downstream by the chain gripper 43, removed from above the paper discharge table 45, dropped, and discharged. Stacked on top.
Further, since the UV ink and the UV varnish are dried on the sheet 13 by the drying device 33 during the conveyance, it is not necessary to spray the powder for preventing the show-through.

[Second Embodiment]
Next, 2nd embodiment of this invention is described using FIGS.
In this embodiment, the basic configuration is the same as that of the first embodiment, and the configuration of the UV drying device 33 is different. Therefore, in the present embodiment, this difference will be described, and redundant description of other parts will be omitted.
In addition, the same code | symbol is attached | subjected to the component same as 1st embodiment, and the detailed description is abbreviate | omitted.
FIG. 5 is a side view showing an overall schematic structure of the UV drying apparatus 33. FIG. 6 is a Y view of FIG.

In the present embodiment, a plurality of UV light-emitting diodes 53 that are attached at substantially equal intervals in the width direction W are attached in two rows along the traveling direction H as shown in FIG.
The number of the UV light emitting diodes 53 in each row is the same, and they are attached at substantially the same intervals.
The UV light-emitting diodes 53 attached to the two rows are arranged so that the axis centers of the UV light-emitting diodes 53 in the other row are positioned at a substantially middle position between the axis centers of the adjacent UV light-emitting diodes 53 in one row. ing. That is, the UV light emitting diodes 53 attached in two rows are arranged in a staggered manner.

The irradiation light 57 of the UV light emitting diode 53 includes ultraviolet rays and is formed to diffuse to some extent as shown in FIGS.
The irradiation light 57 irradiated from each UV light emitting diode 53 forms a substantially circular irradiation region 61 on the assumed path S of the sheet 13. That is, the irradiation region 61 of the irradiation light 57 irradiated to the sheet 13 from the UV drying device 33 has a shape in which circles are arranged in a staggered manner along the width direction as shown in FIG.

Then, when the irradiation distance L along the traveling direction in the irradiation region is plotted in the width direction, an assumed irradiation region 63 shown in FIG. 8 is obtained. Note that the irradiation distance L is the distance between both irradiation areas 61 because the sheet 13 passes through both irradiation areas when the circular irradiation areas 61 overlap along the traveling direction H. Is added.
In this way, the irradiation region 61 of the UV light emitting diode 53 in the other row is located in a portion where the irradiation region 61 generated between the adjacent UV light emitting diodes 53 in one row does not exist or is insufficient. If both are combined, the irradiation distance L can be made substantially uniform along the width direction W as shown in FIG. Further, a sufficient length can be secured even with the shortest irradiation distance L0.

Therefore, the UV drying device 33 has a sufficient irradiation distance L in the traveling direction H and can secure a substantially uniform irradiation region 61 in the width direction W, so that printing defects such as partial curing failure of UV ink or UV varnish can be prevented. Can be prevented.
In this case, the UV ink or UV varnish transferred to the sheet 13 can be irradiated with ultraviolet rays having an appropriate irradiation distance L by appropriately adjusting the overlapping degree of the staggered arrangement.
Further, when the irradiation distance L is insufficient in two rows, the number of rows of the UV light-emitting diodes 53 is increased to secure it.

In this embodiment, the irradiation light 57 of the UV light emitting diode 53 is diffused. For example, as shown in FIG. 9, the UV light emission has a straight irradiation light 57 in which the irradiation region 61 is relatively narrow. A diode 53 may be used.
Further, as shown in FIG. 10, the irradiation light 57 of each UV light-emitting diode 53 may be covered with the reflection member 55 of the first embodiment to form a substantially rectangular irradiation region 61. In this way, as shown in FIG. 10B, the assumed irradiation region 63 can be made substantially uniform in the width direction as in the first embodiment.

[Third embodiment]
Next, a third embodiment of the present invention will be described using FIG. 11 and FIG.
In this embodiment, the basic configuration is the same as that of the first embodiment, and the configuration of the UV drying device 33 is different. Therefore, in the present embodiment, this difference will be described, and redundant description of other parts will be omitted.
In addition, the same code | symbol is attached | subjected to the component same as 1st embodiment, and the detailed description is abbreviate | omitted.
FIG. 11 is a side view showing the overall schematic structure of the UV drying device 33.

In the present embodiment, a plurality of UV light-emitting diodes 53 attached at substantially equal intervals in the width direction W are attached so as to be inclined in the width direction W as shown in FIG.
The UV light-emitting diode 53a (one point) at the center is mounted substantially vertically (the inclination angle θ with respect to the perpendicular is approximately 0 degrees), and the UV light-emitting diodes 53 located on both sides are inclined so that the lower part faces the UV light-emitting diode 53a. ing.
The inclination angle θ with respect to the vertical line at the center of the axis of each UV light emitting diode 53 is set to increase as the distance from the UV light emitting diode 53a increases.
Each of the UV light emitting diodes 53 emits a substantially straight irradiation light 57. For this, a light that irradiates diffusing irradiation light 57 may be used.

As described above, the UV light emitting diodes 53 located on both sides are inclined so as to be largely inclined as they move away from the UV light emitting diode 53a at the central position, and therefore, the irradiation light 57 of the UV light emitting diodes 53 adjacent in the width direction. Irradiation area 61 due to is partially overlapped, and irradiation area 61 of UV drying device 33 is formed as shown in FIG.
In addition, since the irradiation light 57 of the UV light emitting diode 53 is diffused, it is considered that the optical power of the peripheral portion is relatively weak compared to the central portion, but the peripheral portions of the adjacent irradiation light 57 overlap. , Sufficient light power can be obtained.

Therefore, the UV drying device 33 has a sufficient irradiation distance L in the traveling direction H and can secure a substantially uniform irradiation region 61 in the width direction W, so that printing defects such as partial curing failure of UV ink or UV varnish can be prevented. Can be prevented.
In this case, it is possible to irradiate the UV light emitting diodes 53 along the width direction W more appropriately by appropriately tilting the UV light emitting diodes 53.

In the present embodiment, the vertical position of the UV light emitting diode 53 is substantially constant. For example, as shown in FIG. 13, the vertical position of the UV light emitting diode 53 is a line K having a predetermined curvature. The UV light emitting diode 53 may form a fan.
In this way, since the distance from the UV light emitting diode 53 to the assumed path S of the sheet 13 can be made substantially constant, the light power in the width direction W can be made more uniform.

  In this embodiment, the UV light emitting diode 53a at the center is used as a reference. However, the present invention is not limited to this, and the UV light emitting diode 53 at an arbitrary position in the width direction W may be used as a reference.

In addition, this invention is not limited to the said embodiment, In the range which does not deviate from the summary of this invention, it can change suitably.
In this embodiment, the present invention is applied to a sheet-fed printing machine, but the present invention can be applied to a printing machine of an appropriate type such as a rotary printing machine.

It is a front view which shows the whole schematic structure of the sheet-fed printing press concerning 1st embodiment of this invention. It is a side view which shows schematic structure of the drying apparatus concerning 1st embodiment of this invention. It is XX sectional drawing of FIG. It is a schematic diagram which shows the irradiation area | region of the drying apparatus concerning 1st embodiment of this invention. It is a side view which shows schematic structure of the drying apparatus concerning 2nd embodiment of this invention. FIG. 6 is a Y view of FIG. 5. It is a schematic diagram which shows the irradiation area | region of the drying apparatus concerning 2nd embodiment of this invention. It is a schematic diagram which shows the assumption irradiation area | region of the drying apparatus concerning 2nd embodiment of this invention. It is a schematic diagram which shows the irradiation area | region in another embodiment of the drying apparatus concerning 2nd embodiment of this invention. It is a schematic diagram which shows the irradiation area | region in another embodiment of the drying apparatus concerning 2nd embodiment of this invention. It is a side view which shows schematic structure of the drying apparatus concerning 3rd embodiment of this invention. It is a schematic diagram which shows the irradiation area | region of the drying apparatus concerning 3rd embodiment of this invention. It is a side view which shows schematic structure of another embodiment of the drying apparatus concerning 3rd embodiment of this invention.

Explanation of symbols

1 sheet printing machine 13 sheet 33 UV drying device 53 UV light emitting diode 55 reflecting member 57 irradiating light 59 reflecting surface 61 irradiating area H paper traveling direction W width direction

Claims (4)

A printing machine that transfers an ultraviolet curable material to a transported print medium and irradiates the print medium with light including ultraviolet rays from a light source device to cure the ultraviolet curable material,
The light source device is configured such that a plurality of light emitting diodes that irradiate light including ultraviolet rays are combined so that their irradiation regions are related to each other, and a substantially uniform irradiation region is formed in the width direction. A printing machine featuring.   In the light source device, a plurality of the light emitting diodes are arranged in a crossing direction intersecting a traveling direction of the print medium, and a reflecting surface surrounds an irradiation path of irradiation light irradiated from these light emitting diodes individually or collectively. The printing press according to claim 1, further comprising: a reflection member provided in such a manner that the reflection surfaces facing in the traveling direction are separated by a predetermined distance or more.   In the light source device, a plurality of the light emitting diodes arranged in a crossing direction intersecting a traveling direction of the print medium are provided in a plurality of rows in the traveling direction, and light emitting diodes in adjacent rows are arranged in a staggered manner. The printing machine according to claim 1 or 2, characterized by the above-mentioned. In the light source device, the plurality of light emitting diodes are arranged in a crossing direction intersecting a traveling direction of the print medium, the light emitting diodes are inclined toward the one point side around a certain point, and from the one point The printing press according to any one of claims 1 to 3, wherein the light emitting diodes that are separated from each other are inclined more greatly.

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