JPH04275149A - gravure printing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gravure printing machine.

0002

2. Description of the Related Art Generally, a gravure printing machine has a structure as shown in FIG.
After the excess ink on the plate surface is scraped off by the doctor 24, the ink clogged in the cells on the surface of the plate is removed from the original fabric passing between the plate cylinder 23 and the impression cylinder 25. It is designed to be transferred and printed on the surface of 26.

0003

[Problems to be Solved by the Invention] However, in conventional gravure printing machines, because the distance between the impression cylinder and the furnisher roll is long, the time during which the plate surface is in direct contact with air after printing is prolonged, causing problems in the plate surface. The ink remaining on the bottom of the cell was easy to dry. When the residual ink in the cells dries, the supply of new ink to the cells becomes incomplete, and the amount of ink transferred from the cells to the original paper decreases, which can be used when printing characters or patterns, etc. when the cell area of the plate is small. teeth,
There was a problem in that printing fading and pattern omissions often occurred.

The present invention has been made in view of the above-mentioned problems, and its purpose is to provide a gravure printing machine that can print neatly even when the cells have a small area. There is a particular thing.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the gravure printing press of the present invention has a plate cylinder arranged so that the plate surface is immersed in the ink surface of an ink pan, and a plate cylinder and an impression cylinder that are connected to each other. A furnisher roll is disposed at a position rearward in the rotational direction of the contact point of the ink pan and higher than the ink surface of the ink pan, and an applicator that supplies ink from above toward the contact point of the furnisher roll and the plate cylinder. It is characterized by its placement.

[0006]

[Operation] In the gravure printing machine with the above configuration,
The distance between the plate surface and the furnisher roll after ink transfer is shortened, and ink remaining in the cells is prevented from drying.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 and 2 show an embodiment of a gravure printing machine according to the present invention, with FIG. 1 being a perspective view of the main part, and FIG. 2 being a schematic sectional view of the main part. As shown in these figures, in the gravure printing press of the present invention, the plate cylinder 1 is disposed so as to be immersed in the ink surface of the ink pan 2, and the plate cylinder 1 is disposed so as to be immersed in the ink surface of the ink pan 2, and the plate cylinder 1 is disposed so as to be immersed in the ink surface of the ink pan 2. A furnisher roll 4 is disposed at a position rearward in the rotational direction and higher than the ink surface of the ink pan 2. Further, an applicator 5 is disposed to supply ink from above to a location where the furnisher roll 4 and the plate cylinder 1 come into contact. Further, in this embodiment, an air motor 6 is attached to rotate the furnisher roll 4 smoothly.

The applicator 5 is shown in the top view of FIG.
As shown in the bottom view of FIG. 4 and the side view of FIG.
The horizontal metal pipe 11 located at the tip is closed at both ends with metal caps 14, and a slit 15 for ink supply is provided along the length at the bottom except for the connecting part. On the other hand, a pair of mounting jigs 1 are attached to the vertical metal pipe 12.
6 is attached by a clasp 17, and L is attached to the rear.
A shape joint 18 is attached.

As shown in FIGS. 1 and 2, the applicator 5 is arranged so that the horizontal metal pipe 11 is located above and parallel to the contact point between the furnisher roll 4 and the plate cylinder 1. The ink pan 2 is attached to the ink pan 2 using each attachment jig 16 in such a manner that the ink pan 2 is in a suitable state. In this case, each mounting jig 16 is fixed to the ink pan 2 using screws or the like in holes 19 formed on both sides thereof. Further, the applicator 5 is connected to an ink circulation pump (not shown) by an L-shaped joint 18 at the rear.

In the gravure printing machine configured as described above, ink from the ink circulation pump is supplied to the applicator 5.
The paper is sent to the rear of the printer and printed. The ink is fed into the horizontal metal pipe 1 in the applicator 5.
The paper is discharged downward from a slit 15 provided on the lower side of the plate cylinder 1, and is supplied to the location where the furnisher roll 4 and the plate cylinder 1 directly below contact each other. Since the furnisher roll 4 is driven by the air motor 6 and rotates smoothly in the direction of the arrow in FIG. This ensures that the ink adheres to the plate surface, and the ink overflowing from both sides falls into the ink pan 2 below. A certain amount of ink is stored in this ink pan 2 so that the plate cylinder 1 is immersed to an appropriate height, and any excess ink is collected in an ink tank 7 and sent back to the ink supply pump. I am guided.

Therefore, in the portion of the printing plate where printing has been completed, the cells are filled with ink at the point where the ink remaining in the cells comes into contact with the furnisher roll 4 before it dries, and this state further deteriorates. Leave the ink pan 2
It will be soaked in the ink inside. After the excess ink on the printing plate is scraped off by the doctor 8, the ink in the cells is transferred to the surface of the web 9 passing between the printing cylinder 1 and the impression cylinder 3, and printing is performed again. be exposed.

In the present invention, it is preferable to increase the diameter of the furnisher roll 4 to increase the contact area to prevent uneven rotation. Furthermore, in the above embodiment, the furniture roll 4 is driven by the air motor 6 in order to smoothly rotate it.
Depending on conditions such as increasing the viscosity of the ink or increasing the diameter of the furnisher roll 4, the furnisher roll 4 may
If the air motor 6 rotates smoothly, there is no need to use the air motor 6.

[0013]

[Effects of the Invention] As explained above, according to the present invention,
Ink is supplied to the furnisher roll, which is located higher than the ink surface of the ink pan, so the time that the printed plate surface is directly exposed to air is shortened, and ink remaining in the cells is prevented from drying out. Therefore, even when characters or patterns are printed on a printing plate having small-area cells, defects such as printing fading and pattern omission can be eliminated, and beautiful printed matter can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of essential parts of a gravure printing machine as an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of the main parts.

FIG. 3 is a top view of the applicator.

FIG. 4 is a bottom view of the applicator.

FIG. 5 is a side view of the applicator.

FIG. 6 is a schematic cross-sectional view of main parts of a conventional gravure printing machine.

[Explanation of symbols]

1 Plate cylinder 2 Ink pan 3 Impression cylinder 4 Furnisher roll 5 Applicator

Claims (1)

[Claims] Claim 1: A plate cylinder is disposed so that the plate surface is immersed in the ink surface of the ink pan, and a furnisher is provided at a position rearward in the rotational direction from the position where the plate cylinder and impression cylinder contact and higher than the ink surface of the ink pan. 1. A gravure printing machine, comprising a roll and an applicator that supplies ink from above to a contact point between the furnisher roll and the plate cylinder.