JP2006181963A - Sheet perfecting press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a hardened film from being accumulated on the impression cylinder on a post-printing side of a sheet perfecting press which dries ink with a UV lamp. <P>SOLUTION: The sheet perfecting press 1 is provided with pre-printing units 2, 3 which print one face of a sheet and post-printing units 4, 5 which print the other face of the sheet. An intermediate cylinder 14 which transfers the sheet is provided between the respective impression cylinders 12, 19 provided to the pre-printing unit 3 and the post-printing unit 4, and a UV lamp 24 is arranged opposite to the sheet transferring surface of the intermediate cylinder 14. Furthermore, a blowing nozzle 25 which blows cooling air toward the transferring surface is provided between the UV lamp 24 and the sheet transferring surface of the impression cylinder 19 of the post-printing unit 4 to cool the sheet. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sheet-fed duplex printer that pre-prints a sheet by a printing unit and then dries the ink by UV (Ultra Violet) irradiation.

There are two types of printing machines: a type with a jacket wound around the impression cylinder of a post-printing printing unit and a type without a jacket.
Usually, a double-sided printing machine for oil-based ink uses a jacket type. The jacket can prevent the ink from adhering to the surface by applying a silicic acid agent, but the surface of the jacket may be rough and point contact, and the printed part may come off (peel off). There is a drawback that a print quality difference occurs on both sides. On the other hand, the jacketless type prevents the ink from adhering to the impression cylinder by irradiating the printing surface with a UV lamp using an ultraviolet curable ink after the sheet is preprinted.

FIG. 7 shows a sheet-fed duplex printing machine equipped with a conventional UV lamp.
This printing machine 1 is provided with printing units 2 and 3 on the upstream side with a central intermediate cylinder 14 sandwiched therebetween, and printing unit 2 and 3 on the downstream side, and a post-printing printing unit 4 on the downstream side. , 5 are provided. The upstream preprint printing units 2 and 3 are each provided with plate cylinders 6 and 10 and blanket cylinders 7 and 11, which are in contact with the impression cylinders 8 and 12, and between the impression cylinders 8 and 12. An intermediate cylinder 9 is provided.
Similarly, downstream post-printing units 4 and 5 are each provided with plate cylinders 17 and 21 and blanket cylinders 18 and 22, which are in contact with impression cylinders 19 and 23, and between the impression cylinders 19 and 23. Is provided with an intermediate cylinder 20. Intermediate cylinders 13 to 16 are disposed between the pre-printing printing unit 3 and the post-printing printing unit 4, that is, between the impression cylinders 12 and 19, and the sheet of the intermediate cylinder 14 having a large cylinder diameter is conveyed. A UV lamp 24 is provided facing the outer peripheral surface on the side facing the outer peripheral surface.

In such a printing machine, sheets are supplied one by one from a paper feeder (not shown), the front surface of the sheet is printed by the pre-printing printing units 2 and 3, and the back surface is printed by the post-printing printing units 4 and 5. The stacked sheets are stacked on a paper discharge device (not shown) on the downstream side. In addition, the thick line in a figure has shown the conveyance path of the sheet | seat (the thick line shown in another figure is also the same).
The printing machine 1 provided with the UV lamp 24 prints a sheet using ultraviolet curable UV ink, hi-bright ink, hybrid ink, or the like. Therefore, after the printing on the surface side of the sheet is completed by the preprint printing unit 3, when the sheet is transferred to the intermediate cylinder 14, the printing surface of the sheet is irradiated by the UV lamp 24, and the ink is cured and dried. As a result, both the front and back sides of the sheet can be printed with the same quality, and there is an effect that a back-preventing powder in the paper discharge unit is unnecessary.
JP 2003-39628 A

However, in a sheet-fed double-sided printing press equipped with a UV lamp, the ink on the surface side of the preprinted sheet is cured and dried, so the ink liquid does not adhere, but the sheet stores the irradiation heat of the UV lamp, By pressing a large number of sheets by being pressed against the front surface of the impression cylinder on the post-printing side, there is a problem that the pattern adheres to the impression cylinder surface and accumulates. Note that. The component of the deposit that adheres to the impression cylinder is mainly Si, which is an ink component, and other ink pigments, such as Ca and Cu.
The present invention has been made in view of such circumstances, and an object of the present invention is to prevent a cured film from being deposited on the impression cylinder on the post-printing unit side of a sheet-fed double-sided printing machine that dries ink with a UV lamp. .

In order to achieve the above object, claim 1 of the present invention comprises a preprint printing unit for printing one surface of a sheet and a postprint printing unit for printing the other surface of the sheet, and the preprint printing unit. And a post-printing printing unit provided with an intermediate cylinder for conveying the sheet between the respective impression cylinders, and a sheet-fed duplex printing machine provided with a UV lamp facing the sheet transfer surface of the intermediate cylinder The gas jetting means is provided opposite to the sheet conveying surface between the UV lamp and the impression cylinder of the post-printing printing unit, and the sheet is cooled by the jetted gas from the jetting means.
According to a second aspect of the present invention, there is provided a preprint printing unit for printing one side of a sheet and a postprint printing unit for printing the other side of the sheet. And a post-printing printing unit provided with an intermediate cylinder for conveying the sheet between the respective impression cylinders, and a sheet-fed duplex printing machine provided with a UV lamp facing the sheet transfer surface of the intermediate cylinder A cooling intermediate cylinder provided with a cooling jacket through which cooling water circulates is provided between the intermediate cylinder and the impression cylinder of the post-printing printing unit, and the sheet is cooled by the cooling intermediate cylinder. .
According to a third aspect of the present invention, in order to achieve the above object, the first printing unit includes a first printing unit that prints one side of a sheet and a second printing unit that prints the other side of the sheet. And a post-printing printing unit provided with an intermediate cylinder for conveying the sheet between the respective impression cylinders, and a sheet-fed duplex printing machine provided with a UV lamp facing the sheet transfer surface of the intermediate cylinder In the above, a suction duct for partitioning the periphery of the UV lamp and sucking hot air generated from the UV lamp is provided in the partition, and the hot air in the partition is sucked by the suction duct.
In the invention of claim 1 or 3, a cooling intermediate cylinder having a cooling jacket in which cooling water circulates is provided between the intermediate cylinder and the impression cylinder of the post-printing printing unit, and the sheet can be further cooled. it can.
According to the first or second aspect of the present invention, the periphery of the UV lamp is partitioned, and a suction duct for sucking hot air generated from the UV lamp is provided in the partition, and the suction air sucks hot air in the partition. be able to.

In the present invention, the gas jetting means is provided opposite to the sheet conveying surface between the UV lamp and the impression cylinder of the post-printing printing unit, and the sheet is cooled by the jetted gas from the jetting means. Ink can be prevented from accumulating on the impression cylinder of the printing unit.
In the present invention, a cooling intermediate cylinder having a cooling jacket in which cooling water circulates is provided between the intermediate cylinder and the impression cylinder of the post-printing printing unit, and the sheet is cooled by the cooling intermediate cylinder. Therefore, ink can be prevented from being deposited on the impression cylinder of the post-printing printing unit.
In the present invention, the periphery of the UV lamp is partitioned and a suction duct for sucking hot air generated from the UV lamp is provided in the partition, and the hot air in the partition is sucked by the suction duct. Ink can be prevented from accumulating on the impression cylinder. In addition, ozone gas can be collected in a concentrated manner, making the printer friendly to the environment.

Hereinafter, a sheet-fed duplex printing machine according to a first embodiment of the present invention will be described with reference to the drawings. The same parts as those of the background double-sided printing machine of the background art will be described with the same reference numerals as those shown in FIG. 6 (the same applies to the following embodiments).
The sheet-fed double-sided printing machine 1 shown in FIG. 1 includes pre-printing printing units 2 and 3 on the upstream side along the sheet flow, and includes post-printing printing units 4 and 5 on the downstream side. Each of the printing units 2 to 5 prints different colors on a sheet, but basically has the same structure. Therefore, the first preprint printing unit 2 will be described. A plate cylinder 6 is provided, and the plate cylinder 6 has a structure in which ink is applied from an ink supply unit (not shown).
Ink is transferred from the plate cylinder 6 to the blanket cylinder 7 disposed adjacent to the plate cylinder 6 by a rotating operation. A sheet is conveyed between the blanket cylinder 7 and the impression cylinder 8 disposed adjacent to the blanket cylinder 7. When the sheet is conveyed between them, the front surface of the sheet (printing from the back surface is also possible. Printing) and prints.

Between the second pre-printing printing unit 3 and the first post-printing printing unit 4, intermediate cylinders 13 to 16 are sequentially arranged from the upstream side, and the intermediate cylinder 14 arranged on the central side is another intermediate cylinder. A cylinder larger than the cylinder diameter of the cylinders 13, 15 and 16 is used. A UV lamp 24 is disposed opposite the surface of the intermediate cylinder 14 on which the sheet is conveyed, and the UV lamp 24 is directed toward the irradiation surface side so that the sheet surface can be irradiated when the sheet passes. .
Air blowing nozzles 25 and 26 are disposed downstream of the UV lamp 24, that is, between the UV lamp 24 and the impression cylinder 19 of the first post-printing printing unit 4. The spray nozzles 25 and 26 are arranged on the sheet conveying surface side of the intermediate cylinders 14 and 15 at the corresponding positions, and can inject air onto the sheet surface. In the present embodiment, the spray nozzles 25 and 26 are connected to the cooling device 31 and can spray air having a temperature lower than normal temperature onto the seat surface. However, the jet air may be room temperature air. The number of spray nozzles 25 and 26 may be other than three, but in the case of one, it is more effective to bring the nozzle closer to the impression cylinder 19 side located away from the UV lamp. The cooling air is blown over the entire width direction of the sheet surface.

With such a configuration, the surface of the sheet is printed by the preprint printing units 2 and 3, and the surface (printing surface) side of the sheet is irradiated by the UV lamp 24 at the position of the intermediate cylinder 14. Since the ink printed on the sheet is an ultraviolet curable type, it is cured. Further, since the UV lamp 24 is disposed so as to face the large-diameter intermediate cylinder 14, the irradiation area can be increased. After the sheet ink is irradiated by the UV lamp 24, the surface side of the sheet is radiated by the blowing nozzle 25 disposed on the downstream side thereof to radiate heat. Next, the air blowing nozzle 26 arranged to face the next intermediate cylinder 15 blows cooling air to the back side of the sheet to dissipate the heat of the sheet, and finally is arranged to face the impression cylinder 19. The spray nozzle 27 sprayed cool air on the surface side of the sheet.
After the sheet 1 is radiated by the spray nozzles 25 to 27, the back side of the sheet is printed by the first back printing unit 4 through the intermediate cylinder 16, and the front side of the sheet is in contact with the impression cylinder 19. At this time, since the sheet is radiated to reduce the temperature, it is possible to prevent ink from being deposited (pyling) on the surface of the impression cylinder 19.
The specific temperature reduction effect has been a temperature of 65 ° C. to 70 ° C. in the conventional UV lamp section, but the temperature decreases to 45 ° C. In the post-printing unit 4, the surface temperature of the impression cylinder decreases from 44 ° C. to 34 ° C. In the printing unit 5, the temperature decreased from 36 ° C to 30 ° C. In addition, the temperature which does not piling is about 35 degrees C or less.

Next, a second embodiment of the present invention will be described.
The sheet-fed duplex printing machine shown in FIG. 1 is of a type in which the pre-printing printing unit is located below the impression cylinder and the post-printing printing unit is located above the impression cylinder. The sheet-fed double-sided printing machine 1 shown in FIG. 2 of the present embodiment is of a type that includes a reversing machine and that reverses the paper surface by the reversing machine. Therefore, each printing unit is different from the first embodiment in that it is positioned above the impression cylinder. However, the basic configuration of each of the printing units 2 to 5 is the same as that of the above embodiment, and thus the description of each of the printing units 2 to 5 is omitted.
The reversing part of the printing press 1 shown in FIG. 2 is arranged between the second preprint printing unit 3 and the first postprint printing unit 4, and is an intermediate cylinder arranged adjacent to the impression cylinder 12. A large-diameter reversing intermediate cylinder 29 and a reversing cylinder 30 are disposed on the downstream side of 28 so that the front and back of the sheet conveyed to the reversing unit can be reversed. The large-diameter intermediate inversion intermediate cylinder 29 is provided with a UV lamp 24 so as to face the outer peripheral surface thereof, so that UV light can be irradiated toward the surface side of the intermediate cylinder 29. An air blowing nozzle 25 is disposed between the UV lamp 24 and the pressure drum 19 of the first post-printing printing unit 4 so as to face the outer peripheral surface of the intermediate drum 29, and faces the outer peripheral surface of the pressure drum 19. The air blowing nozzle 26 is disposed toward the sheet conveying surface. The air blowing nozzles 25 and 26 are connected to a cooling device (not shown) (see the cooling device 31 in FIG. 1), and can blow cooling air.

  In such a printing machine 1, the surface side of the sheet is printed by the preprint printing units 2 and 3, and when the sheet is conveyed to the position of the intermediate cylinder 29, the surface (printing surface) side of the sheet is irradiated by the UV lamp 24. . The ultraviolet curable ink attached to the sheet is dried and cured after being irradiated with the UV lamp 24. The sheet is blown with cold air on the surface side by the spray nozzle 25 disposed on the outer peripheral surface side of the reversal intermediate cylinder 29, and heat is radiated from the sheet. Next, the sheet is reversed by the reversing cylinder 30, and the spray nozzle 26 disposed in front of the printing pressure point (contact point) of the impression cylinder 19 and the blanket cylinder 18 blows cooling air to the back side of the sheet. , Dissipate the heat of the sheet. Thereafter, the back side of the sheet is printed by the first post-printing printing unit 4, and the front side of the sheet is in contact with the impression cylinder 19. At this time, since the sheet is dissipated to reduce the temperature, it is possible to prevent ink from adhering to and accumulating on the surface of the impression cylinder 19.

Next, a third embodiment of the present invention will be described with reference to FIGS.
In the first embodiment, the air blowing nozzle 26 is disposed to cool the sheet. However, in this embodiment, a pair of cooling intermediate cylinders 32 and 33 are arranged in place of the air blowing nozzle 26. Has been established.
The sheet-fed double-sided printing machine 1 shown in FIG. 3 has an intermediate cylinder 14 disposed between the second pre-printing printing unit 3 and the first post-printing printing unit 4. On the side, a UV lamp 24 is arranged. Cooling intermediate cylinders 32 and 33 are disposed between the intermediate cylinder 14 and the impression cylinder 19.

Since both the cooling intermediate cylinders 32 and 33 have the same structure, only one cooling intermediate cylinder 32 will be described.
As shown in FIG. 4, the cooling intermediate cylinder 32 has a shaft portion 32a rotatably supported by the frame 34. A plurality of water flows through the cylinder body 35 supported by the shaft portion 32a as shown in FIG. An outer flowing water channel 36 (shown by oblique lines) and an inner flowing water channel 37 that passes through the central portion of the trunk body 35 are provided. The flow channels 36 and 37 are connected to a cooling device 38 that cools the water, and the cooling water is supplied from the cooling device 38 to the trunk body 35 through the shaft portion 32 a of the cooling intermediate drum 33, and one end of the outer flowing water channel 36. After flowing from the side to the other end side, it flows to the inner flowing water channel 37 and is returned to the cooling device 38.

  In such a sheet-fed duplex printing machine 1, the surface of the sheet is printed by the preprint printing units 2 and 3, and the surface side of the sheet is irradiated by the UV lamp 24 at the position of the intermediate cylinder 14. The ultraviolet curable ink adhering to the sheet is irradiated with the UV lamp 24 and then conveyed to the cooling intermediate cylinders 32 and 33. Since the cooling water circulates inside the cooling intermediate cylinders 32 and 33, the surface thereof is reduced in temperature, and the heat of the sheets is taken away while the sheets are conveyed by the intermediate cylinders 32 and 33. At this time, since the sheet is dissipated to reduce the temperature, it is possible to prevent ink from adhering to and accumulating on the surface of the impression cylinder 19.

Next, a fourth embodiment of the present invention will be described with reference to FIG.
In the first embodiment, the air blowing nozzle 26 is disposed to cool the sheet. However, in the present embodiment, suction ducts 41 to 43 are disposed instead of the air blowing nozzle 26. Is different.
The sheet-fed duplex printing machine 1 shown in FIG. 6 has an intermediate cylinder 14 disposed between the second printing unit 3 and the first printing unit 4, and the intermediate cylinder 14 has a UV on the sheet conveyance surface side. A lamp 24 is provided. Then, the periphery of the UV lamp 24 is covered with a partition 44 such as a casing, and suction ducts are provided on the upstream side and the downstream side in the sheet conveyance direction at the position where the UV lamp 24 is disposed so that the air in the partition 44 can be sucked. 41 and 42 are provided. A suction duct 43 is disposed downstream of the intermediate cylinder 14 and positioned on the sheet discharge side at the contact portion between the intermediate cylinders 14 and 15 in the partition 44. These suction ducts 41 to 43 are connected to a suction device (not shown). The number of ducts may be other than three.

  In such a printer 1, the surface side of the sheet is printed by the preprint printing units 2 and 3, and when the sheet is conveyed to the position of the intermediate cylinder 14, the surface side of the sheet is irradiated by the UV lamp 24. At a certain position of the UV lamp 24, the surrounding atmosphere becomes about 90 ° C. due to heat of the UV lamp 24 or the like. Thus, by sucking air around the UV lamp 24 with the suction ducts 41 to 43, it is possible to prevent the temperature inside the partition from rising. Therefore, after the ink is cured and dried by the UV lamp 24, the sheet accumulates on the surface of the impression cylinder 19 even if it passes through the printing pressure points of the impression cylinder 19 and the blanket cylinder 18 of the post-printing printing unit 4. It is prevented. In addition, ozone gas can be collected in a concentrated manner, making the printer friendly to the environment.

Although the embodiments of the present invention have been described above, the present invention is of course not limited thereto, and various modifications and changes can be made based on the technical idea of the present invention.
For example, in each of the embodiments described above, the spray nozzle, the cooling intermediate cylinder, and the suction duct are used to prevent the ink from being deposited on the impression cylinder. However, these means can be appropriately combined.

1 is a schematic side view of a sheet-fed double-sided printing machine (no reversing machine) in which a sheet is cooled using cooling air according to a first embodiment of the present invention. It is a schematic side view of the sheet | seat double-sided printing machine (with a reversing machine) which carried out sheet | seat temperature reduction using the cooling wind by the 2nd Embodiment of this invention. It is a schematic side view of the sheet-fed double-sided printing machine which reduced the temperature of the sheet using the cooling intermediate cylinder according to the third embodiment of the present invention. It is sectional drawing of the sheet-fed double-sided printing machine of FIG. It is sectional drawing in the XX line direction of FIG. It is a schematic side view of the sheet-fed double-sided printing machine which reduced the temperature of the sheet using the suction duct according to the fourth embodiment of the present invention. It is a schematic side view of the conventional sheet-fed double-sided printing machine without a cooling device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sheet-fed double-sided printing machine 2 1st preprint printing unit 3 2nd preprint printing unit 4 1st postprint printing unit 5 2nd postprint printing unit 6,10,17,21 Plate cylinder 7,11 , 18, 22 Blanket cylinder 8, 12, 19, 23 Pressure cylinder 9, 13-16, 20, 28 Intermediate cylinder 24 UV lamp 25-27 Spray nozzle 29 Large diameter reversing intermediate cylinder 30 Reversing cylinder 31, 38 Cooling device 32 , 33 Cooling intermediate cylinder 32a Shaft part 34 Frame 35 Body body 36 Outer flow channel 37 Inner flow channel 41-43 Suction duct 44 Partition

Claims (5)

Each of the impression cylinders provided in the first printing unit and the second printing unit, comprising: a first printing unit that prints one side of the sheet; and a second printing unit that prints the second side of the sheet. In a sheet-fed double-sided printing machine comprising an intermediate cylinder that conveys the sheet between, and a UV lamp disposed on the sheet transfer surface of the intermediate cylinder,
A gas jetting means is provided opposite to a sheet conveying surface between the UV lamp and the impression cylinder of the post-printing printing unit, and the sheet is cooled by jetted gas from the jetting means. Sheet-fed duplex printing machine. Each of the impression cylinders provided in the first printing unit and the second printing unit, comprising: a first printing unit that prints one side of the sheet; and a second printing unit that prints the second side of the sheet. In a sheet-fed double-sided printing machine comprising an intermediate cylinder that conveys the sheet between, and a UV lamp disposed on the sheet transfer surface of the intermediate cylinder,
A cooling intermediate cylinder provided with a cooling jacket through which cooling water circulates is provided between the intermediate cylinder and the impression cylinder of the post-printing printing unit, and the sheet is cooled by the cooling intermediate cylinder. Characteristic sheet-fed double-sided printing machine. Each of the impression cylinders provided in the first printing unit and the second printing unit, comprising: a first printing unit that prints one side of the sheet; and a second printing unit that prints the second side of the sheet. In a sheet-fed double-sided printing machine comprising an intermediate cylinder that conveys the sheet between, and a UV lamp disposed on the sheet transfer surface of the intermediate cylinder,
A single-sided sheet having a suction duct for partitioning the periphery of the UV lamp and sucking hot air generated from the UV lamp in the partition, and sucking hot air in the partition by the suction duct Printer. The cooling intermediate cylinder having a cooling jacket through which cooling water circulates is provided between the intermediate cylinder and the impression cylinder of the post-printing printing unit to further cool the sheet. The sheet-fed double-sided printing machine according to 3. 2. The partition around the UV lamp, and a suction duct for sucking hot air generated from the UV lamp is provided in the partition, and hot air in the partition is sucked by the suction duct. Or the sheet | seat double-sided printing machine of 2.

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