JP3233678U - Gravure printing equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gravure printing apparatus capable of miniaturization. SOLUTION: A gravure printing apparatus 11 has a web between a first axis 13 capable of winding a web W, a second axis 14 capable of winding a web W, and a first axis 13 and a second axis 14. It is provided with a pair of nip rollers 18 capable of reciprocating the W along the transport path, and a printing unit 29 arranged in the transport path and capable of printing a single color on the web W transported by the pair of nip rollers 18. One printing unit 29 is configured to be interchangeable with another printing unit 29A capable of printing a single color different from the above-mentioned single color on the web W. [Selection diagram] Fig. 1

Description

The present invention relates to a gravure printing apparatus that prints on the web such as a plastic film.

Conventionally, as this type of gravure printing apparatus, for example, the gravure printing machine described in Patent Document 1 is known. Such a gravure printing machine includes a plurality of printing units that print with inks of different colors in order to print a plurality of colors on the transported web. Then, the plurality of printing units print a plurality of colors by sequentially adding one color to the transported web.

Japanese Unexamined Patent Publication No. 2005-324386

By the way, the above-mentioned gravure printing machine has a problem that it becomes large because it is necessary to arrange as many printing units as the number of colors required for printing on the Web.
The present invention was made by paying attention to such a situation. The purpose is to provide a gravure printing apparatus capable of miniaturization.

Hereinafter, means for solving the above problems and their actions and effects will be described.
The gravure printing apparatus that solves the above-mentioned problems conveys the web between the first axis capable of winding the web, the second axis capable of winding the web, and the first axis and the second axis. One printing unit including a transport unit capable of reciprocating along a route and a printing unit arranged in the transport route and capable of printing a single color on the web transported by the transport unit. The gist is that the unit is configured to be interchangeable with another printing unit capable of printing a single color different from the single color on the web.

According to this configuration, since there is only one printing unit, it is possible to reduce the size as compared with a gravure printing apparatus having a plurality of printing units. In this case, the web that has been unwound from the first axis and printed and then wound up on the second axis can be rewound to the first axis again, so that printing by one printing unit and replacement of one printing unit can be performed. By repeating the rewinding of the web as many times as the number of colors required for printing the web, it is possible to print a plurality of colors even if there is only one printing unit.

The gravure printing apparatus preferably includes a laminating mechanism for adhering a laminating film to the web after printing.
According to this configuration, the web after printing can be laminated.

In the gravure printing apparatus, the laminating mechanism has a pair of nip rollers capable of pinching while heating the web and the laminating film in a stacked state, and the pair of nip rollers constitute the transport portion. It is preferable to have.

According to this configuration, since the pair of nip rollers constituting the laminating mechanism can also be used as the transport unit for transporting the web, the number of parts can be reduced as compared with the case where the pair of nip rollers are not also used as the transport unit.

According to the present invention, the gravure printing apparatus can be miniaturized.

The schematic block diagram of the gravure printing apparatus of one Embodiment. The block diagram which shows the electrical structure of a gravure printing apparatus. A plan view showing a part of the web on which the register mark is printed.

Hereinafter, an embodiment of the gravure printing apparatus will be described with reference to the drawings.
As shown in FIG. 1, the gravure printing apparatus 11 prints while transporting the web W from the upstream side to the downstream side along the transport path, and includes a substantially rectangular parallelepiped frame 12. In this case, a long paper, a plastic film, or the like can be used as the web W, but a plastic film is used for the web W of the present embodiment.

A first shaft 13 capable of winding the web W and a second shaft 14 capable of winding the web W are arranged on one side and the other side of the frame 12 with the central portion in the longitudinal direction interposed therebetween. The first axis 13 and the second axis 14 face each other in the longitudinal direction of the frame 12. A drying unit 15 for drying the printed web W is arranged on the upper portion of the frame 12. At the end of the frame 12 on the second shaft 14 side in the longitudinal direction, a laminating mechanism 16 for laminating the laminating film L to the printed web W is arranged.

As shown in FIGS. 1 and 2, the laminating mechanism 16 is wound around a third shaft 17 around which the laminate film L is wound, a pair of nip rollers 18 arranged in a transport path of the web W, and a third shaft 17. It includes a plurality of guide rollers 19 that guide the rotated laminated film L to a pair of nip rollers 18. The third shaft 17 can be rotationally driven by the third motor 20, and is rotationally driven in the direction of feeding out the laminated film L by driving the third motor 20.

The pair of nip rollers 18 hold the laminated film L unwound from the third shaft 17 and the printed web W to which the adhesive is applied while heating them in a state of being overlapped with each other, thereby holding the laminated film L and the printed web. Paste with W. A metal cooling roller 21 capable of cooling the web W to which the laminated film L is attached is arranged at a position immediately downstream of the pair of nip rollers 18 in the transport path of the web W. Cooling water is circulated inside the cooling roller 21.

As shown in FIGS. 1 and 2, the first shaft 13 is rotationally driven by the first motor 22, and is rotationally driven in the direction in which the web W is wound by the drive of the first motor 22. The second shaft 14 can be rotationally driven by the second motor 23, and is rotationally driven in the direction in which the web W is wound by the driving of the second motor 23.

A plurality of driven rollers 24 can rotate at appropriate intervals in the transport path of the web W from the first shaft 13 on the upstream side to the second shaft 14 on the downstream side via the drying unit 15. Have been placed. That is, the plurality of driven rollers 24 guide the web W along the transport path.

The pair of nip rollers 18 are arranged at positions on the downstream side of the drying unit 15 in the transport path of the web W, and are configured so that the web W can be reciprocally transported along the transport path between the first shaft 13 and the second shaft 14. Has been done. In the present embodiment, the pair of nip rollers 18 constituting the laminating mechanism 16 also function as a transport unit capable of reciprocating the web W along the transport path. That is, the pair of nip rollers 18 constitute not only the laminating mechanism 16 but also the conveying portion.

One of the pair of nip rollers 18 is composed of a metal heating roller 26 that can be heated to a predetermined temperature by the heater 25, and the other is composed of a rubber roller 27. The heating roller 26 can be rotationally driven in both forward and reverse directions by the transport motor 28, and the rubber roller 27 is driven to rotate as the heating roller 26 is rotationally driven.

Then, when the heating roller 26 is rotationally driven in the positive direction (clockwise in FIG. 1) with the web W sandwiched between the heating roller 26 and the rubber roller 27, the web W is driven by the second axis 14 along the transport path. When the heating roller 26 is rotationally driven in the opposite direction (counterclockwise in FIG. 1), the web W is conveyed toward the first axis 13 along the transfer path.

At a position on the upstream side of the drying unit 15 in the transport path of the web W, one printing unit 29 capable of printing a single color on the web W transported from the upstream side to the downstream side by a pair of nip rollers 18 is arranged. ing. The printing unit 29 has a columnar plate cylinder 31 that sandwiches the web W with a rubber columnar impression cylinder 30 arranged so as to face the printing unit 29 with the web W interposed therebetween, and ink inside. It is provided with a bottomed box-shaped ink pan 32 for storing.

The plate cylinder 31 is arranged so that a part of the peripheral surface on which an intaglio such as a pattern or a character is formed is immersed in the ink in the ink pan 32. As the plate cylinder 31 rotates, its peripheral surface is sequentially immersed in the ink in the ink pan 32, and the ink enters the intaglio portion (dented portion) used for printing. A doctor blade 33 for scraping off ink adhering to a portion of the peripheral surface of the plate cylinder 31 that is not used for printing other than the intaglio portion is in contact with the peripheral surface of the plate cylinder 31. Then, when the web W is sandwiched between the plate cylinder 31 and the impression cylinder 30, the ink held in the intaglio portion on the peripheral surface of the plate cylinder 31 is transferred to the web W, so that the web W is printed.

The plate cylinder 31 can be rotationally driven by the plate cylinder motor 34, and can be rotationally driven in both forward and reverse directions by driving the plate cylinder motor 34. The plate cylinder 31 is provided with a rotary encoder 35 that detects the amount of rotation of the plate cylinder 31. The position of the plate cylinder 31 is adjusted in the axial direction (the width direction of the web W; the direction orthogonal to the paper surface in FIG. 1) by the position adjusting mechanism 36. The above-mentioned one printing unit 29 is configured to be interchangeable with another printing unit capable of printing other different single colors on the Web W.

That is, the plate cylinder 31 and the ink pan 32 containing ink can be replaced with another plate cylinder and an ink pan containing other ink. The impression cylinder 30 is configured to be movable between a pressing position in which the web W is sandwiched between the plate cylinder 31 and a non-pressing position in which the web W is not sandwiched between the plate cylinder 31. The replacement work of the plate cylinder 31 and the ink pan 32 containing the ink is performed in a state where the impression cylinder 30 is moved to the non-pressurizing position.

Upstream to detect the register mark M shown in FIG. A side sensor 37 and a downstream sensor 38 are arranged respectively. The upstream sensor 37 and the downstream sensor 38 have two phototubes each.

Then, for example, when printing three color patterns on the web W in sequence, a right-angled isosceles triangle shape for registering when printing the second color pattern when printing the first color pattern. The register mark M is printed on the web W, and the register mark M for registering when printing the third color pattern is further printed on the web W when the second color pattern is printed.

An in-feed unit 39 capable of adjusting the tension of the web W is arranged between the upstream sensor 37 and the first axis 13 in the transport path of the web W. The in-feed unit 39 has a feed roller 40 and a feed nip roller 41 for sandwiching the web W between the feed rollers 40. The feed roller 40 can be rotationally driven in both forward and reverse directions by the feed motor 42, and the feed nip roller 41 is driven to rotate as the feed roller 40 is rotationally driven.

The drying unit 15 has a case 43 and two dryers 44 provided in the case 43. The web W after printing passes through the case 43, and the web W after printing receives warm air from two dryers 44 in the process of passing through the case 43 and is dried.

Next, the electrical configuration of the gravure printing apparatus 11 will be described.
As shown in FIG. 2, the gravure printing apparatus 11 includes a control unit 45 that controls the entire apparatus. An operation unit 46, an upstream sensor 37, a downstream sensor 38, and a rotary encoder 35 for performing various operations of the gravure printing device 11 are electrically connected to the input side interface (not shown) of the control unit 45, respectively. ing.

The position adjusting mechanism 36, the heater 25, and the dryer 44 are electrically connected to the output side interface (not shown) of the control unit 45, respectively. Further, in the output side interface (not shown) of the control unit 45, a plate cylinder motor 34, a first motor 22, a second motor 23, a third motor 20, a feed motor 42, and a transfer motor 28 are respectively motor drive circuits. It is electrically connected via 47-52.

The control unit 45 individually controls the drive of the position adjusting mechanism 36, the heater 25, and the dryer 44 based on the signals transmitted from the operation unit 46, the upstream sensor 37, the downstream sensor 38, and the rotary encoder 35. do. Further, the control unit 45 uses the plate cylinder motor 34, the first motor 22, the second motor 23, and the second motor based on the signals transmitted from the operation unit 46, the upstream sensor 37, the downstream sensor 38, and the rotary encoder 35. 3 The drive of the motor 20, the feed motor 42, and the transfer motor 28 is individually controlled via the motor drive circuits 47 to 52.

The control unit 45 grasps the rotation position (phase) of the plate cylinder 31 based on the pulse signal transmitted from the rotary encoder 35. The control unit 45 controls the drive of the feed motor 42 via the motor drive circuit 51 so that the printing unit 29 prints at a predetermined position on the web W based on the signal transmitted from the upstream sensor 37. It controls the drive of the position adjusting mechanism 36. The control unit 45 controls the drive of the plate cylinder motor 34 via the motor drive circuit 47 so that the printing unit 29 prints at a predetermined position on the web W based on the signal transmitted from the downstream sensor 38. At the same time, the drive of the position adjusting mechanism 36 is controlled.

Next, the operation of the gravure printing apparatus 11 will be described.
When printing a multi-colored pattern on the web W, first, the heating roller 26 is rotationally driven in the forward direction (clockwise in FIG. 1) and in the direction in which the web W is wound (clockwise in FIG. 1). The second shaft 14 is rotationally driven. Then, the web W wound around the first shaft 13 is unwound and unwound from the first shaft 13 and is transported toward the downstream side along the transport path. The web W unwound from the first axis 13 is conveyed while being sandwiched between the plate cylinder 31 and the impression cylinder 30 constituting the printing unit 29, and the first color pattern is printed.

At this time, a register mark M1 for registering when printing the second color pattern is also printed on the end portion of the web W in the width direction. The web W on which the first color pattern is printed is conveyed toward the downstream side, and in the process of being conveyed in the case 43 of the drying unit 15, it receives warm air from two dryers 44 on the printing surface and dries. Will be done. The web W dried by the dryer 44 is transported toward the downstream side along the transport path and wound up by the second shaft 14.

Subsequently, in order to print the second color pattern on the web W on which the first color pattern is printed, the heating roller 26 is rotationally driven in the opposite direction (counterclockwise in FIG. 1), and the web W is wound up. The first axis 13 is rotationally driven in the direction (clockwise in FIG. 1). At this time, the impression cylinder 30 is moved from the pressing position to the non-pressing position. Then, the web W on which the first color pattern is printed, which is in a state of being wound around the second axis 14, is conveyed toward the upstream side along the conveying path and is wound around the first axis 13. .. That is, the web W on which the first color pattern is printed, which is wound around the second axis 14, is rewound to the first axis 13.

Subsequently, after replacing the printing unit 29 with the printing unit 29A that prints the second color pattern, the heating roller 26 is rotationally driven in the forward direction and the second shaft 14 is rotationally driven in the direction in which the web W is wound up. .. At this time, the impression cylinder 30 is moved from the non-pressing position to the pinching position. Then, the web W wound around the first shaft 13 is unwound and unwound from the first shaft 13 and is transported toward the downstream side along the transport path.

Subsequently, when the register mark M1 (see FIG. 3) printed on the web W at the time of printing the first color pattern is detected by the upstream sensor 37, the control unit 45 sends the web W based on the detection result. The printing unit 29A prints the second color pattern at a predetermined position on the first color pattern, and the distance between the register marks M1 becomes a predetermined pitch (in this example, the circumference length of the plate cylinder 31). Controls the drive of the feed roller 40.

That is, the infeed unit 39 adjusts the tension of the web W toward the printing unit 29A so that the printing unit 29A prints the second color pattern at a predetermined position on the first color pattern of the web W. At the same time, the position adjusting mechanism 36 adjusts the axial position of the plate cylinder 31. This adjustment is performed every time the plate cylinder 31 is rotated once. In this case, the web W expands and contracts slightly by adjusting the tension by the infeed unit 39.

In the initial printing alignment in the transport direction of the web W, the detection timing of the register mark M1 by the upstream sensor 37 and the rotation of the plate cylinder 31 are performed before the impression cylinder 30 is moved from the non-pressing position to the pressing position. It is done automatically based on the position of the direction. In this case, the initial print position in the transport direction of the web W is calculated based on the position of the register mark M1 and the origin position in the rotation direction of the plate cylinder 31. As a result, the loss of the web W due to the initial printing alignment in the transport direction of the web W is minimized.

Subsequently, the web W whose tension is adjusted by the in-feed unit 39 is conveyed while being sandwiched between the plate cylinder 31 and the impression cylinder 30 constituting the printing unit 29A, and a second color pattern is printed. .. At this time, a register mark M2 (see FIG. 3) for registering when printing the pattern of the third color is also printed on the end portion of the web W in the width direction. The web W on which the second color pattern is printed is transported toward the downstream side.

Then, when the register mark M1 and the register mark M2 of the web W are detected by the downstream sensor 38, the control unit 45 sets a predetermined position on the first color pattern of the web W and the printing unit based on the detection result. Feedback control is performed on the drive of the plate cylinder motor 34 and the drive of the position adjusting mechanism 36 so as to eliminate the deviation from the position where the second color pattern is printed by 29A. As a result, the rotational position (phase) of the plate cylinder 31 and the axial position of the plate cylinder 31 are adjusted. In this case, the web W is slightly expanded and contracted by applying tension due to the rotation of the plate cylinder 31.

The web W on which the first color pattern and the second color pattern that have passed through the downstream sensor 38 are printed is conveyed toward the downstream side, and in the process of being conveyed in the case 43 of the drying unit 15, the two dryers 44 It is dried by receiving warm air from the printing surface. The web W dried by the dryer 44 is transported toward the downstream side along the transport path and wound up by the second shaft 14.

The printing of the third and subsequent colors on the web W is performed in the same manner as described above, and when the printing of the last color on the web W is completed, the web W is rewound from the second axis 14 to the first axis 13 and the ink pan is used. The ink in 32 is changed to an adhesive, and the plate cylinder 31 is changed to a roller for applying the adhesive to the web W. Subsequently, the laminate film L is unwound from the third shaft 17, and the laminate film L is joined to the web W between the pair of nip rollers 18 (between the heating roller 26 and the rubber roller 27). At this time, the laminated film L is arranged so as to overlap the printed surface of the web W.

Then, when the heating roller 26 is rotationally driven in the positive direction while being heated by the heater 25, the heating roller 26 and the rubber roller 27 pinch and press the laminated film L and the web W coated with the adhesive in an overlapping state. It is adhered by an adhesive in the process of being conveyed to the downstream side while being heated. That is, the web W is subjected to a laminating process in which the laminate film L is bonded to the printed surface of the web W to which the adhesive is applied. The laminated web W is cooled by the cooling roller 21 and then wound around the second shaft 14.

As described above, since the gravure printing apparatus 11 of the present embodiment has one printing unit 29, the size can be reduced as compared with the gravure printing apparatus having a plurality of printing units. Further, in the gravure printing apparatus 11 of the present embodiment, the web W wound out on the second axis 14 after being unwound from the first axis 13 and printed can be rewound on the first axis 13 again.

Therefore, in the gravure printing apparatus 11 of the present embodiment, printing by one printing unit 29, replacement of one printing unit 29, and rewinding of the web W are repeated for the number of colors required for printing the web W. By doing so, it is possible to print a plurality of colors even if there is only one printing unit 29. Further, since the gravure printing apparatus 11 of the present embodiment includes the laminating mechanism 16, both the printing of the web W and the laminating process on the web W after printing can be performed in one step.

According to the embodiment described in detail above, the following effects are exhibited.
(1) The gravure printing device 11 includes one printing unit 29 capable of printing a single color on the web W, and one printing unit 29 can print a single color different from the above single color on the web W. It is configured to be replaceable with another printing unit 29A. According to this configuration, since there is only one printing unit 29, the size can be reduced as compared with the gravure printing apparatus having a plurality of printing units. Therefore, even old people and women can be easily handled.

(2) The gravure printing apparatus 11 includes a laminating mechanism 16 for laminating the laminating film L to the web W after printing. According to this configuration, the web W after printing can be quickly laminated.

(3) In the gravure printing apparatus 11, the laminating mechanism 16 has a pair of nip rollers 18 capable of pinching while heating the web W and the laminating film L in a stacked state, and the pair of nip rollers 18 hold the web W. It constitutes a transport unit for transport. According to this configuration, since the pair of nip rollers 18 constituting the laminating mechanism 16 can also be used as the transport portion for transporting the web W, the number of parts can be reduced as compared with the case where the pair of nip rollers 18 are not also used as the transport portion.

(Change example)
The above embodiment may be changed as follows.
-The pair of nip rollers 18 constituting the laminating mechanism 16 do not necessarily have to be shared with the conveying portion for conveying the web W. That is, a pair of rollers as a transport unit may be provided separately from the pair of nip rollers 18.

-The laminating mechanism 16 may be omitted.

11 ... Gravure printing apparatus, 13 ... 1st axis, 14 ... 2nd axis, 16 ... Laminating mechanism, 18 ... Nip rollers constituting the laminating mechanism and transport section, 29, 29A ... Printing section, L ... Laminated film, W ... Web ..

Claims (3)

The first axis that can wind up the web and
The second axis that can wind up the web and
A transport unit capable of reciprocating the web between the first axis and the second axis along a transport path, and
A printing unit that is arranged in the transport path and is capable of printing a single color on the web that is transported by the transport unit.
With
A gravure printing apparatus, wherein one printing unit is interchangeably configured with another printing unit capable of printing a single color different from the single color on the web. The gravure printing apparatus according to claim 1, further comprising a laminating mechanism for adhering a laminating film to the web after printing. The laminating mechanism has a pair of nip rollers that can be pressed while heating the web and the laminating film in a stacked state.
The gravure printing apparatus according to claim 2, wherein the pair of nip rollers constitute the transport unit.

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