JP2973822B2 - Method and apparatus for correcting partial color in gravure printing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for correcting a partial color tone in gravure printing.

[0002]

2. Description of the Related Art In gravure printing, a plate surface on the outer peripheral surface of a plate cylinder is immersed in liquid ink in an ink pan, and then ink on a plate surface portion other than a cell is scraped off by a doctor. This is a printing method in which a plate cylinder is rotated while paper is sandwiched between the cells, and ink is transferred from cells to paper by circular pressure. A printing plate having such cells,
It is generally produced by corrosion and the color change is made in advance during the production of this plate.

[0003]

Therefore, in the case where a partial change in color tone is required after the plate is completed, such as a partial darkening, conventionally, the plate is recreated from the beginning. Therefore, there is a problem in that the plate is expensive and therefore costly. In addition, it takes time to re-create the plate from the beginning, and there is a problem that it is not possible to respond quickly.
The present invention has been devised in view of the above circumstances, and an object of the present invention is to provide a gravure printing method that can quickly respond to partial color correction in gravure printing without increasing the cost of partial color change. It is an object of the present invention to provide a method and an apparatus therefor.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a method of immersing a plate surface of a plate cylinder in ink in an ink pan to fill the cells with ink, and transferring the ink in the cells to paper. In the gravure printing to be performed, before the plate surface is immersed in the ink in the ink pan, the color correction ink is filled in the cells of the plate cylinder where the color correction is to be performed. Further, the invention is characterized in that the color tone correction ink is supplied over the entire circumference of a plate cylinder passing through a plate cylinder location where color tone correction is to be performed. Further, the present invention is characterized in that the color tone correcting ink has the same hue as the ink in the ink pan and a different density.

Further, according to the present invention, the plate cylinder is rotated to immerse the plate surface in the ink, the ink other than the ink filled in the cells of the plate surface is scraped off, and the paper is pressed against the plate surface.
A partial color tone correction device attached to a gravure printing machine for transferring ink in a cell to paper, comprising: a frame disposed near the plate cylinder; and a length shorter than the plate cylinder; An inking roller parallel to the cylinder and rotatably supported by the frame in contact with the plate cylinder; an auxiliary ink pan supported by the frame and containing a color correction ink; and a color correction in the auxiliary ink pan Ink supply means for supplying ink to the peripheral surface of the inking roll, the inking roll,
Where the ink in the plate cylinder cells is transferred to the paper,
It is characterized in that the plate surface of the plate cylinder is disposed between the plate surface and a portion to be immersed in the ink. Further, the present invention is characterized in that the frame is detachably mounted on a frame of a gravure printing machine. Further, the present invention is characterized in that the frame is provided with a moving mechanism for moving the inking roll in a direction of separating from and approaching the plate cylinder in a state where the frame is attached to a frame of a gravure printing press. . Further, the present invention is characterized in that the ink supply means comprises an ink source roll having a lower part immersed in the color correcting ink of the auxiliary ink pan, and an ink doctor roll that comes into contact with the ink source roll and contacts the inking roll. It is characterized by having been done. Also,
In the present invention, the inking roll, the ink doctor roll, and the inking roll are connected by a power transmission mechanism, and the inking roll contacts and rotates with the plate cylinder, whereby the inking roll and the inking roll are rotated. It is characterized by the following. Further, the present invention is characterized in that a plurality of the partial color tone adjusting devices are arranged at intervals in the longitudinal direction of the plate cylinder.

[0006]

The color correction ink is filled in the cells of the plate surface of the plate cylinder. Even if the plate cylinder rotates and is immersed in the ink pan, the ink in the ink pan is not filled in the cells already filled with the color correction ink, and the ink in the ink pan is filled in other cells not filled with the color correction ink. Will be filled. Then, the color correction ink and the ink in the ink pan are transferred to the paper.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a side view of a partial tone correction device and a gravure printing machine according to an embodiment, FIG. 2 is a front view of the main part, FIG. 3 is a side view of the partial tone correction device, FIG. 4 shows a view taken in the direction of arrow A in FIG. 1 is a gravure printing machine, 3 is a plate cylinder, 5 is a doctor, 7 is a pressure cylinder, 9 is an ink pan, and the ink pan 9 contains a liquid ink 11,
Substantially the lower half of the plate cylinder 3 is immersed in the ink 11. The plate cylinder 3 is rotated in a direction indicated by an arrow X by a power transmission mechanism 13 including gears and the like, and the plate cylinder 3 is immersed in the ink pan 9 to fill the cells of the plate surface 301 with the ink 11. The ink 11 on the plate surface 301 other than the cells is scraped off by the doctor 5,
Subsequently, the ink 11 in the cell is transferred to the paper 15 by the circular pressure of the pressure cylinder 7, and printing is performed. On the frame 101 side of the gravure printing machine 1, a guide member 17 having an L-shaped cross section is provided in parallel with the plate cylinder 3.

Reference numeral 21 denotes a partial color correction device according to this embodiment. The partial color correction device 21 corrects the color tone, as shown in FIG. An auxiliary ink pan 29 in which the color tone correcting ink 27 to be stored is accommodated, and an ink supply means 31 for supplying the color tone correcting ink 27 in the auxiliary ink pan 29 to the inking roll 25, and the like. Inks having the same hue as the ink 11 in the ink pan 9 and different densities, specifically, inks having a high density are used.

The frame 23 is detachably attached to the guide member 17. The frame 23 includes an attachment portion 33 attached to the guide member 17 and an attachment portion 33
A relay block 39 which is connected to the upper and lower sides of the relay block 39 via a guide rod 35 and a male screw member 37, and a support block 43 which is connected to a lower end of the relay block 39 by a bolt 41 and extends vertically. Support block 4
The auxiliary ink pan 29 is attached to the lower part of the third ink pan 3.
The mounting portion 33 includes a horizontal piece 17 of the guide member 17.
01 is formed, and the mounting portion 33 is formed.
Of the horizontal piece 1701 is attached to the guide member 17.
Is inserted into the concave groove 3301, the shaft 47 is projected into the concave groove 3301 by operating the handle 45, and the horizontal piece 1701 is fastened to the upper surface of the concave groove 3301 by the shaft 47. The guide rod 3 is provided above the mounting portion 33.
5 is fixed, and an end of a male screw member 37 is rotatably supported at 33 places below the guide rod 35, and a handle 48 is attached to the outer end of the male screw member 37. I have.

A slide bearing 49 is incorporated in the upper part of the relay block 39, and the guide rod 35 is slidably inserted into the bearing 49. The bearing 49
A female screw 51 is formed at a position below the female screw 5.
1, the male screw member 37 is screwed. Therefore, when the male screw member 37 is rotated by operating the handle 48, the relay block 39 and the support block 43 reciprocate along the guide rod 35, and the plate surface 30 of the plate cylinder 3 is moved.
1 in the direction away from and approaching, the handle 48,
The moving mechanism 53 includes the male screw member 37 and the guide rod 35.
Is configured.

As shown in FIG. 4, three bearing holes 55, 57, 59 are formed in the support block 43 in parallel with the longitudinal direction of the plate cylinder 3, and each bearing hole 55, 57, 5 is provided.
Bearings 60 are attached to both ends in the longitudinal direction of 9. The first shaft 61 is inserted into the lowermost bearing hole 55, the second shaft 63 is inserted into the intermediate bearing hole 57, and the uppermost bearing hole 59 is inserted into the lowermost bearing hole 59. Third axis 6
5, the shafts 61, 63, and 65 are rotatably supported by bearings 60, and the third shaft 65 is positioned closest to the plate cylinder 3.

An ink source roll 67 is fixed to one end of the first shaft 61, and a first sprocket 69 is fixed to the other end of the first shaft 61. The ink source roll 67 includes:
Color correction ink 27 stored in auxiliary ink pan 29
The lower part is arranged so that it is immersed. The outer peripheral portion of the ink source roll 67 is formed of, for example, rubber or metal mesh, and when immersed in the color tone correcting ink 27 in the auxiliary ink pan 29, the color tone correcting ink 27 is applied to the peripheral surface of the ink source roll 67. Adhere to.

An ink doctor roll 71 is fixed to one end of the second shaft 63, and a second sprocket 73 is fixed to the other end of the second shaft 63. The ink doctor roll 71 is disposed so that the peripheral surface thereof contacts the peripheral surface of the ink source roll 67. The outer peripheral portion of the ink doctor roll 71 is formed of, for example, a metal mesh, and comes into contact with the peripheral surface of the ink source roll 67 to which the color tone correcting ink 27 is attached, so that the ink doctor roll 7
The color tone correcting ink 27 is uniformly attached to the peripheral surface of the ink jet printer 1.

An inking roll 25 is fixed to one end of the third shaft 65, and a third sprocket 75 is fixed to the other end of the third shaft 65. The inking roll 25
Is arranged such that the peripheral surface thereof contacts the peripheral surface of the ink doctor roll 71. The outer peripheral portion of the inking roll 25 is formed of, for example, rubber, and comes into contact with the peripheral surface of the ink doctor roll 71 to which the color adjusting ink 27 is attached, so that the color correcting ink 27 is applied to the peripheral surface of the inking roll 25. Adhere evenly.

As shown in FIG. 5, a chain 77 is mounted between the first sprocket 69 and the third sprocket 75, and a second sprocket 73 is meshed with an intermediate portion of the chain 77 from the outside to apply ink. The roll 25 comes into contact with the plate cylinder 3 and is rotated by the plate cylinder 3, and the rotational force is applied to the chain 77, the sprockets 69, 73, and 75.
Is transmitted to the ink doctor roll 71 and the ink source roll 67 via the Then, when the ink source roll 67 rotates, the color correction ink 27 adheres to the peripheral surface of the ink source roll 67, and this ink 27 is supplied to the inking roller 25 via the ink doctor roll 71, and the inking roller 25 From the ink source roll 67, the ink doctor roll 71,
Ink supply means 31 for supplying the color correction ink 27 in the auxiliary ink pan 29 to the peripheral surface of the inking roll 25 by the chain 77, sprockets 69, 73, 75, and the like.
Is configured.

Next, the operation will be described. First, the mounting portion 33 is fixed to the guide member 17 so as to face three plate cylinders whose color tone is to be corrected. Next, handle 4
By operation 8, the relay block 39 and the support block 43 are moved toward the plate cylinder 3, and the peripheral surface of the inking roll 25 is brought into contact with the plate surface 301 of the plate cylinder 3. And
The gravure printing press 1 is driven in the state set as described above.

With the rotation of the plate cylinder 3, the inking roll 25 is rotated, and the chain 77 and the sprocket 6 are rotated.
The ink source roll 67 and the ink doctor roll 71 rotate through 9, 73, and 75, and the color correction ink 27 in the auxiliary ink pan 29 passes through the ink source roll 67 and the ink doctor roll 71 and is applied to the peripheral surface of the inking roll 25. The color correction ink 27 is uniformly applied, and is filled from the inking roll 25 into the cells of the plate surface 301 of the plate cylinder 3. The plate surface 301 of the plate cylinder 3 is immersed in the ink pan 9 by further rotation of the plate cylinder 3. At this time, the plate cylinder 3 corresponding to the width of the inking roll 25 is used.
In the cells of 301 plate surfaces, the color tone correcting ink 27 has already been set.
Is filled, the ink 11 in the ink pan 9 is difficult to be supplied into the cell even when immersed in the auxiliary ink pan 29, and the cell is still filled with the color tone correction ink 27. Roll 25
The ink 11 in the ink pan 9 is filled in the cells of three plate cylinders other than the width of the plate cylinder.

Excess ink is scraped off the plate surface 301 of the plate cylinder 3 coming out of the ink pan 9 by the doctor 5, and the ink 11 and the color correction ink 27 filled in the cells of the plate surface 301 of the plate cylinder 3 Plate cylinder 3
Is transferred onto the paper 15 sandwiched by the pressure cylinder 7 and printed with the ink 11 and the color tone correcting ink 27. Thereafter, similarly, the tone correcting ink 27 is filled into the cells of the plate cylinder 3 from the inking roll 25, and the ink 11 in the ink pan 9 is filled in the cells of the plate cylinder 3 other than the width of the inking roll 25. Then, the ink 11 and the color correction ink 27 are printed on the paper 15. When the plate cylinder 3 is immersed in the ink 11 in the ink pan 9, the color tone correcting ink 27 adhered to the place other than the cells of the plate cylinder 3 by the inking roll 25 is applied to the ink 1.
1 and is scraped off by the doctor 5 and mixed into the ink 11 in the ink pan 9. However, since the amount of the color tone correcting ink 27 mixed into the ink 11 is very small, there is almost no effect on printing. . In the embodiment, since the color correction ink 27 is different from the ink 11 only in density,
It is even more so.

According to the present embodiment, the inking roll 25 is simply moved to the plate cylinder 3 without recreating the plate cylinder 3.
, The partial color tone can be adjusted, and therefore, the partial color tone in gravure printing can be adjusted at low cost and in a short time. In addition, the partial tone correction device 21 is connected to the gravure printing machine 1.
Since it is provided detachably to the frame 101 side, it can be easily applied to the existing gravure printing machine 1 and is excellent in versatility. Further, since the inking roll 25 is provided so as to be movable in a direction approaching and separating from the plate cylinder 3, the invention can be applied to both cases where color tone correction is performed and when color tone correction is not performed. Further, in the embodiment, since the color tone correction ink 27 is the same hue as the ink 11 in the ink pan 9 and has a high density, the color tone correction ink 27 is added to the size of the cell (in other words, the amount of ink) determined by the width and depth. It is possible to adjust even the ink density, and more advanced printing is possible.

Further, since the partial color tone correcting device 21 can be attached to a desired position in the longitudinal direction of the plate cylinder 3 of the gravure printing machine 1 so as to face the same, FIG.
As shown in (b), it is possible to correct the color tone at an arbitrary place. Further, if a plurality of partial tone correction devices 21 are provided, it is possible to perform tone correction at a plurality of locations. Further, for example, when the color control mark and the matching mark printed on the edge of the material to be printed are hard to be visually recognized, for example, when registering a transparent varnish, the apparatus according to the present embodiment allows only these marks to be visually recognized. The color can be easily changed to an easy-to-use color, and registration can be easily performed.

The structure of the inking roll 25 and the structure of the ink supply means 31 for supplying the color correcting ink 27 to the inking roll 25 are variously conceivable, and are not limited to the structures of the embodiments.

[0022]

As is apparent from the above description, the present invention provides a gravure in which the plate surface of a plate cylinder is immersed in ink in an ink pan to fill the cells with ink, and the ink in the cells is transferred to paper. In printing, before the plate surface is immersed in the ink in the ink pan, the cells at the plate cylinder where the color correction is to be performed are filled with the color correction ink. In addition, the present invention rotates the plate cylinder to immerse the plate surface in the ink, scrapes ink other than the ink filled in the cells of the plate surface, presses the paper against the plate surface, and presses the ink in the cells onto the paper. A partial color correction device attached to a gravure printing machine to be transferred, comprising: a frame disposed near the plate cylinder, a length shorter than the plate cylinder, parallel to the plate cylinder, and An inking roll rotatably supported by the frame in contact with the cylinder, an auxiliary ink pan supported by the frame and containing a color correction ink, and a color correction ink in the auxiliary ink pan, An ink supply means for supplying ink to the peripheral surface, wherein the inking roll is provided with a portion where the ink in the cells of the plate cylinder is transferred to the paper and a plate surface of the plate cylinder dipped in the ink. And configured to be disposed between the portion to be. Therefore, in the gravure printing, it is possible to quickly respond to the change in the partial color tone without increasing the cost.

[Brief description of the drawings]

FIG. 1 is a side view of a partial tone correction device and a gravure printing machine.

FIG. 2 is a front view of a main part of the partial color tone correction device and the gravure printing machine.

FIG. 3 is a side view of the partial color correction device.

FIG. 4 is a sectional front view of the partial color tone correcting device.

FIG. 5 is a view taken in the direction of the arrow A in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gravure printing machine 3 Plate cylinder 5 Doctor 7 Pressure cylinder 9 Ink pan 15 Paper 21 Partial color tone correction device 23 Frame 25 Inking roll 29 Auxiliary ink pan 67 Ink base roll 69 Ink doctor roll

Claims (9)

(57) [Claims] 1. In gravure printing in which a plate surface of a plate cylinder is immersed in ink in an ink pan to fill the cells with ink, and the ink in the cells is transferred to paper, the plate surface is immersed in ink in the ink pan. A method for correcting a partial color tone in gravure printing, wherein a color tone correction ink is filled in a cell of a plate cylinder where color tone correction is to be performed. 2. The partial tone correction method for gravure printing according to claim 1, wherein said tone correction ink is supplied over the entire circumference of a plate cylinder passing through a plate cylinder where color tone is to be corrected. 3. The partial tone correction method for gravure printing according to claim 1, wherein the tone correction ink has the same hue as the ink in the ink pan and a different density. 4. A plate cylinder is rotated to immerse the plate surface in ink, scrapes ink other than the ink filled in the cells of the plate surface, presses the paper against the plate surface, and transfers the ink in the cells to the paper. A partial color tone correcting device attached to a gravure printing machine, wherein the frame is disposed near the plate cylinder, and has a shorter length than the plate cylinder, and is parallel to the plate cylinder and the plate cylinder. An inking roll rotatably supported by the frame in contact with the ink tank; an auxiliary ink pan supported by the frame and containing a color correction ink; and a color correction ink in the auxiliary ink pan being rotated around the inking roll. An ink supply means for supplying ink to the surface of the plate cylinder, where the ink in the cells of the plate cylinder is transferred to the paper and the plate surface of the plate cylinder is immersed in the ink. Partial color correction device according to claim is disposed have, that between the point to be. 5. The partial color tone correcting device according to claim 4, wherein the frame is detachably mounted on a frame of the gravure printing press. 6. The frame according to claim 4, wherein the frame is provided with a moving mechanism for moving the inking roll in a direction of separating from and approaching the plate cylinder in a state of being attached to a frame of the gravure printing press. Partial tone correction device. 7. The ink supply means includes an ink source roll having a lower part immersed in a color correction ink of the auxiliary ink pan, and an ink doctor roll that contacts the ink source roll and contacts the inking roll. The partial color tone correcting device according to claim 4, 5 or 6, wherein: 8. The ink-applying roll, the ink-doctor roll, and the ink-applying roll are connected by a power transmission mechanism, and the ink-applying roll comes into contact with a plate cylinder and is rotated to rotate the ink-applying roll and the ink-applying roll. The partial color tone correcting device according to claim 7. 9. The apparatus according to claim 4, wherein a plurality of the partial color tone adjusting devices are arranged at intervals in a longitudinal direction of the plate cylinder.
The partial color tone correcting device according to 6, 7, or 8.