JP3018592B2 - Plate cylinder device - 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 for winding a sheet-like plate around a cylindrical roller for use in a gravure printing apparatus, and more particularly to a plate cylinder device.

[0002]

2. Description of the Related Art Conventional gravure printing machines are based on textile printing using rollers, apply a concave printing plate to a plate cylinder, use a relatively fluid ink as ink, and use excess ink adhering to the printing plate. Is printed on printing paper by scraping with a doctor blade.

[0003] There are various types of gravure printing apparatuses, but the most common form is a structure as shown in Figs.

In FIGS. 5 to 7, reference numeral 1 denotes a substantially flat dish-shaped ink container, which is filled with a resin ink or the like. Further, an ink roller 2 is rotatably arranged in the ink container 1. A plate cylinder 4 is disposed in partial contact with the ink roller 2 formed in a substantially cylindrical shape. The plate cylinder 4 is configured by sticking a cylindrical roller 4b and a plate 4a having a concave pattern on the cylindrical roller 4b.

[0005] A doctor blade 3 is brought into contact with the plate cylinder 4 to scrape off excess ink 7 adhering to the plate 4 a of the plate cylinder 4.

[0006] An impression cylinder 5 is arranged in line contact with the plate cylinder 4, and the pattern of the plate 4 a of the plate cylinder 4 is printed on printing paper 6 fed along the circumferential surface of the impression cylinder 5. When the printing apparatus starts rotating in the above-described configuration, the ink roller 2 in the ink container 1 rotates counterclockwise, for example, as indicated by an arrow, and the ink 7 rotates.
7 moves upward along the circumference of the ink roller 2 as shown in the side view of FIG. 7, and adheres to the surface of the plate 4a of the plate cylinder 4. Further, when rotated, the ink 7 is scraped off by the doctor blade 3. Since the plate 4a of the plate cylinder 4 is concave, the concave portion is filled with ink and excess ink on the surface is scraped off. Therefore, if the plate cylinder 4 is further rotated counterclockwise as shown by the arrow, the plate The ink-coated surface of the plate 4a of the cylinder 4 is transferred to the printing paper 5, and the pattern formed on the plate 4a is printed.

In the printing apparatus as described above, a sheet-like plate 4a wound around and adhered to the cylindrical roller 4b is made of stainless steel, synthetic resin or the like, and the shape thereof is as shown in FIGS. 6A and 6B. In order to form an adhesive layer 8 on the side opposite to the plate making surface of the plate 4a and form the plate cylinder 4, the winding start end 9 of the plate 4a formed in a substantially rectangular shape on the cylindrical roller 4b is positioned at a predetermined position. Is wound and adhered along the outer periphery of the cylindrical roller 4b, and the last wound end portion 10 overlaps the winding start end portion 9 so as to be adhered. A portion 11 is formed, and the overlap portion 11 protrudes outside the plate cylinder 4 by the thickness d of the plate 4a. Such an overlap portion 11 is necessary for firmly attaching the plate 4a to the outer periphery of the cylindrical roller 4b and preventing ink from adhering to the surface of the cylindrical roller 4b during printing.

[0008]

According to the plate cylinder device described in the above-mentioned conventional configuration, the overlapping portion 11 of the plate cylinder 4 is positioned such that the winding start end 9 of the plate 4a is at a predetermined winding position of the cylindrical roller 4b. The overlap cylinder 11 is formed so that the overlap start end 11a on the winding start end 9 and the winding end 10 are on the upper side. 7, the doctor blade 3 scrapes off the ink along the plate 4a in FIG. 7 and abuts on the overlap start end 11a of the overlap portion 11 so as to ride first. A movement is performed so as to drop by a step d corresponding to the thickness d of 4a. For this reason, there has been a problem that a sound that always pops out of the metal is generated, and that the ink is scattered at the step portion, and the surroundings are stained with the ink. Further, ink clumps and dust adhere to the stepped portion between the outer periphery of the plate 4a and the winding end portion 10. To remove these, the doctor blade 3 is swung in the axial direction of the plate cylinder 4 to forcibly remove the ink. I had to make convection.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. It is an object of the present invention to eliminate scattering of ink generated in an overlap portion 11 and to move a doctor blade in the axial direction of a plate cylinder 4. An object of the present invention is to provide a plate cylinder device capable of removing a lump of ink and dust attached to a step portion without causing the plate cylinder device to remove the same.

[0010]

As shown in FIG. 1, a plate cylinder device according to the present invention is configured such that a sheet-shaped plate 4a is partially overlapped with a cylindrical roller 4b and wound and adhered. Plate cylinder 4
In the plate cylinder device composed of the doctor blade 3 arranged to face the plate 4a, the winding end portion 10 of the overlap portion 11 and the overlap start end portion 27 are arranged in a predetermined rotation direction of the plate cylinder 4. The tip of the doctor blade 3 contacts the winding end portion 10 of the overlap portion 11 and then contacts the overlap start end portion 27 of the overlap portion 11.

[0011]

According to the plate cylinder device of the present invention, the doctor blade 3 does not fall down due to the step generated at the step 10a of the winding end portion 10 of the overlap portion 11, and, conversely, the doctor blade 3 is moved by the overlap portion of the step 10a. 11 comes into contact with the winding end portion 10 first, and then comes into contact with the start end portion 27 of the overlap portion so as to slide down.
Does not occur and clumps and dust of the ink 7 during printing can be removed at the stepped portion, so that a mechanism for swinging the doctor blade 3 in the horizontal direction can be obtained.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a plate cylinder device of the present invention and a printing apparatus using the plate cylinder device will be described. Prior to describing the plate cylinder device of this embodiment with reference to FIGS. 1 and 2, a printing apparatus using the plate cylinder device of this embodiment will be described in detail with reference to FIGS.

In FIG. 3, reference numeral 25 denotes a printing apparatus as a whole,
On the front side of the housing 12, a paper feed cassette 13 for storing the printing paper 6 and a discharge cassette 15 for storing the printed paper 14.
Are arranged above and below.

The printing paper 6 placed on the paper feed cassette 13 is locked at a predetermined position of the impression cylinder 5 by a locking claw of the impression cylinder 5 via a printing paper feed belt 16, and then wound around the impression cylinder 5. Is fixed.

The impression cylinder 5 is disposed so as to be in line contact with the plate cylinder 4. As described with reference to FIGS. 5 to 7, the impression cylinder 5 and the plate cylinder 4 are configured by winding a sheet-like plate 4a around a cylindrical roller 4b. As will be described later, the plate mounting portion 17 constituting the plate cylinder 4 has a guide portion 18 for supplying the plate, and the cylindrical roller 4b is connected via the guide portion 18.
The sheet-shaped plate 4a is wound and fixed.

At the lower end of the plate cylinder 4, an ink supply device 19 is provided in a cassette shape.
Is provided with a handle 20 and is configured to be easily pulled out from the housing 12, and is also provided with a doctor blade 3 and an ink roller 2 (not shown). The ink supply device 19 is connected to the ink supply device 19 via a pipe or the like. Ink is supplied.

By rotating the impression cylinder 5 in parallel with the ink roller 2 and the plate cylinder 4, the pattern formed on the plate 4a of the plate cylinder 4 is printed on the printing paper 6 wound around the impression cylinder 5, and the discharge roller 21
The printing paper 6 of the impression cylinder 5 is removed, and the printed paper 14 is stacked on the discharge cassette 15 via the printing paper feed belt 22.

The sheet-like plate 4a having the adhesive layer 8 formed on the guide portion 18 of the plate mounting portion 17 of the printing device 25 on the side opposite to the plate-making surface described with reference to FIG. The layer 8 is placed on the guide 18 with the layer 8 facing upward. The length of the plate 4a is longer than the circumference of the cylindrical roller 4b.
As shown in FIG. 4A, it is wound and fixed while being adhered to the outer peripheral portion of the cylindrical roller 4b via the plate pressing roller 23.

As a result, a plate 4a is formed on the outer periphery of the cylindrical roller 4b as shown in the side view of FIG. 4B. The relationship between the plate cylinder 4 on which the plate 4a is wound and the ink roller 2 and the impression cylinder 5 in the ink supply device 19 is schematically shown in FIG. This operation will be described in detail with reference to FIG.

FIG. 1 shows a state in which a sheet-like plate 4a of this embodiment is wound around a cylindrical roller 4b, and the ink 7 is passed through an ink roller 2.
FIG. 4B is a perspective view of FIG. 4B in a state where the pattern of the plate 4a of the plate cylinder 4 is printed on the printing paper 6 wound around the impression cylinder 5 when viewed from the back side of the paper. Step 10 of winding end portion 10 of overlap portion 11 of plate 4a constituting
a, if the plate cylinder 4 is rotating counterclockwise as shown by an arrow with respect to the longitudinal direction of the doctor blade 3, the winding end portion 10 first comes into contact with the tip of the doctor blade 3, and After riding on the portion 10a, the distal end of the doctor blade 3 moves so as to slide down the overlap start end portion 27 through the overlap portion 11. That is, FIG. 2 is an enlarged view of a main part schematically illustrating the flow of the ink during printing and the movement of the doctor blade 3. Step 10
After riding on a, at the overlap starting end 27, 0.6
Large diameter cylindrical roller 4b with a thickness of about mm
Ink 7
Does not occur.

Further, the dust 26 and the solidified ink 7 adhering to the tip of the doctor blade 3 accumulate between the step 28 between the tip of the doctor blade 3 and the plate 4a and can be removed at this portion. Since the blade swinging mechanism is not required, the tip of the doctor blade 3 can be cleaned once around the plate cylinder, and it is extremely easy to make the ink supply device 19 into a cassette.

[0022]

According to the plate mounting apparatus of the present invention, it is possible to eliminate the generation of sound and the scattering of ink in the overlap portion of the plate cylinder, and the ink is generated between the tip of the doctor blade 3 and the plate during printing. Dust and the like can be removed and a doctor blade traversing mechanism can be omitted.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an embodiment of a plate cylinder device according to the present invention.

FIG. 2 is an enlarged view of a main part for explaining the operation of the plate cylinder device of the present invention.

FIG. 3 is an overall perspective view of a printing apparatus using the plate cylinder device of the present invention.

FIG. 4 is an explanatory view of plate mounting of the plate cylinder device of the present invention.

FIG. 5 is a perspective view of a conventional plate cylinder device.

FIG. 6 is a plan and side sectional view of a plate used in a conventional plate cylinder device.

FIG. 7 is a side view for explaining a plate winding state of a conventional plate cylinder device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ink container 3 Doctor blade 4 Plate cylinder 4a Plate 4b Cylindrical roller 10 Winding end part 11 Overlap part 17 Plate mounting part 18 Guide part

Claims (1)

(57) [Claims] 1. A plate cylinder device comprising a doctor blade which forms a plate cylinder by partially overlapping a sheet-shaped plate with a cylindrical roller and winding and adhering the plate roller, and disposed opposite to the plate. The winding end portion of the overlap portion and the start end portion of the overlap portion are overlapped after the tip of the doctor blade abuts the winding end portion of the overlap portion with respect to the predetermined rotation direction of the plate cylinder. A plate cylinder device characterized in that it comes into contact with the overlap start end of the portion.