JPH11314352A - Ink supplying device for printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably supply an ink with easy check and maintenance. SOLUTION: An ink fountain roller 8 of the ink supplying device is disposed on an upper portion of an ink fountain 9. An ink supply nozzle 12 is aligned along a width direction of the roller 8 to inject an ink to a periphery of the roller 8. A scraper 13 is mounted on an upper surface of the nozzle 12 in contact with an outer periphery of the roller 8 in the width direction to remove a return ink adhered to a return side periphery of the roller 8. An ink supply doctor 15 is disposed under the nozzle 12, aligned via a small gap C along the width direction of the roller 8 to throttle an ink layer injected to the periphery of the roller 8 to form an ink film of a uniform thickness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink supply device for a keyless printing press.

[0002]

2. Description of the Related Art There are various types of ink supply devices for feeding a required amount of ink to a plate cylinder of a printing press.
In offset presses for newspapers, etc., an ink key that adjusts the ink supply amount in the paper width direction to reduce wasted paper when printing, reduce printing preparation work, reduce machine maintenance and inspection work, and facilitate printing operation. A keyless type ink supply device that does not require the above is used.

FIGS. 3 and 4 show an example of a printing unit of a conventional newspaper offset rotary press equipped with a keyless ink supply device. The ink supply device 20 in this printing unit includes the ink source roller 8, the ink supply nozzle 22, the scraper 23, the ink supply doctor 15, and the like shown in FIG. The ink source roller 8 is disposed above the ink fountain 9, and the ink supply nozzle 22 is
The rollers 8 are arranged side by side along the width direction of the ink source roller 8.
Ink is sprayed on the peripheral surface of. The scraper 23 is attached to the lower surface of the ink supply nozzle 22 and contacts the outer peripheral surface of the ink source roller 8 to remove the returned ink. The ink supply doctor 15 is located above the ink supply nozzle 22, and the tip of the blade 16 is arranged side by side with a slight gap C along the width direction of the ink source roller 8.

In the ink supply device 20, the ink supply roller 8 rotates at a low speed in the direction of the arrow shown in the figure, and ink is ejected from the ink supply nozzle 22 onto the peripheral surface thereof. The ink is squeezed by the blade 16 of the ink supply doctor 15 to form an ink film having a uniform thickness. The ink source roller 8 has a peripheral speed difference therefrom, and is in pressure contact with the ink transfer roller 4 having a rubber wound around the peripheral surface. The ink film formed on the ink source roller 8 becomes a thin and uniform ink film due to slippage with the ink transfer roller 4, and is transferred to the peripheral surface of the roller 4. on the other hand,
The return ink adhering to the return side peripheral surface of the ink source roller 8 is scraped off by the scraper 23 and removed.

As shown in FIG. 3, a doctor blade 7 called a hysteresis doctor is provided in the ink roller group of the inking unit in this printing unit, and the doctor blade 7 is in contact with the roller 6 for scraping ink. . The ink remaining on the uneven film including the dampening solution from the plate cylinder 1 returns to the roller 6 and is scraped off by the doctor blade 7. In this way, fresh ink is always supplied from the ink source roller 8 to the plate surface via the ink rollers of the inking unit.

[0006]

The above-mentioned ink supply device 20 has the following points to be improved. Since the ink supply nozzle 22 is located below the ink supply doctor 15, the state of ink ejection from the nozzle 22 cannot be confirmed.
Even if the nozzle is clogged with paper powder, etc., it is difficult to detect. In addition, when cleaning the nozzle and setting the gap between the nozzle tip and the ink source roller 8, the operation cannot be performed unless the ink supply doctor 15 is opened as shown by a chain line in FIG. It was troublesome.

[0007] The scraper 23 is always provided with the ink source roller 8.
Fresh ink is always supplied to the plate surface because the return ink is removed by contacting the return side peripheral surface, but the tip of the scraper 23 is liable to wear, and it is necessary to push and replace it periodically. Since the scraper 23 is located below the ink supply doctor 15 and is attached to the lower surface of the ink supply nozzle 22, its workability is not good. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide an ink supply device for a printing press that is easy to maintain and inspect and can supply ink stably.

[0008]

In order to achieve the above object, the present invention provides an ink supply roller disposed on an ink fountain, an ink supply nozzle for ejecting ink to the surface of the ink supply roller, and an ink supply nozzle. A scraper for removing the return ink adhering to the outer surface of the ink source roller, and an ink supply doctor for squeezing the ink layer jetted onto the surface of the ink source roller to form an ink film of uniform thickness. In the ink supply device, the scraper is mounted on the upper surface of the ink supply nozzle, the ink supply doctor is disposed below the ink supply nozzle, and the ink source roller is rolled down with respect to the ink ejection surface. Rotated.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an ink supply device for a printing press according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a printing unit of a web offset press for newspapers equipped with a keyless ink supply device according to the present invention. In the figure, a plate cylinder 1 of a printing press is provided with a pair of inking rollers 2a and 2b on the plate surface.
The inking rollers 2a and 2b are provided with rubber wrap around their peripheral surfaces, and apply ink to the plate surface of the plate cylinder 1. An ink reciprocating roller 3 is provided in parallel with the ink applying rollers 2a and 2b.
The ink reciprocating roller 3 has a peripheral surface coated with copper, and rotates while reciprocating in the axial direction by driving a gear.

The ink delivery roller 4 comes into pressure contact with an ink source roller 8 described later, is driven to rotate at substantially the same peripheral speed as the plate cylinder 1, and has a rubber wound around the peripheral surface. The ink transfer roller 4 is provided with a rubber roller 5 that is in pressure contact with the ink reciprocating roller 3. The rubber roller 5 comes into pressure contact with a doctor roller 6, and the roller 6 is driven to rotate by a gear (not shown). The doctor blade 7 holds the plate cylinder 1
The ink on the doctor roller 6 returning from is scraped off. The ink supply device 10 sends out a required amount of ink to the plate cylinder 1.

As shown in FIG. 2, the ink supply device 10 includes an ink supply roller 8, an ink supply nozzle 12, a scraper 13, an ink supply doctor 15, and the like.
The ink source roller 8 is disposed above the ink fountain 9 and is rotated at a low speed by a single motor (not shown). The peripheral surface of the ink source roller 8 is plated with copper. The ink source roller 8 rotates in the opposite direction, unlike the conventional example described above. Therefore, it is necessary to reduce or increase the number of roller groups by one, but in the present embodiment, the roller 11 is omitted from the roller group shown in FIG. 3 and the rotation direction is reversed. The ink supply nozzles 12 are arranged side by side along the width direction of the ink supply roller 8, and the lower surface of the supply nozzle 12 is joined to the upper surface of an ink supply pipe 14 arranged in parallel with the axis of the ink supply roller 8. ing. Then, the ink is caused to flow into the openings formed in the joining surfaces, and the ink is jetted onto the peripheral surface of the roller 8. Scraper 1
Reference numeral 3 is attached to the upper surface of the ink supply nozzle 12 and contacts the outer peripheral surface in the width direction of the ink source roller 8 to remove the return ink adhering to the return side peripheral surface of the ink source roller 8.

An ink supply doctor 15 is located below the ink supply nozzle 12, and has a supply blade 16 disposed in parallel with the axis of the ink source roller 8.
7 In addition, the ink supply doctor 15
The supply blade 16 is arranged side by side along the width direction of the ink source roller 8 so that a certain gap C is left with respect to the peripheral surface of the ink source roller 8. The ink supply doctor 15 squeezes the ink layer jetted onto the peripheral surface of the ink source roller 8 to form an ink film having a uniform thickness. Both ends of the support base 17 are attached to a frame via an opening / closing mechanism (not shown) so that the supply doctor 15 pivots as shown by a dashed line and opens and closes with respect to the ink source roller 8.

Next, the operation of the ink supply device of the printing machine will be described. When the operation of the rotary press is started and an ink circulation pump (not shown) is started, fresh ink pumped by the ink supply pipe 14 is supplied to the ink supply nozzle 12.
From the ink source roller 8. Since the ink source roller 8 is rotating in the direction of winding down the ejected ink, the ink layer adhered to the peripheral surface of the ink source roller 8 is squeezed by the tip of the supply blade 16 of the ink supply doctor to be uniform. A thick ink film is formed.

The film-like ink formed on the ink source roller 8 comes into pressure contact with the ink source roller 8, and the roller 8
Ink transfer roller 4 rotating at a higher peripheral speed than
And a thin uniform ink film is transferred to the peripheral surface of the ink transfer roller 4. The remaining ink that has not been transferred to the ink transfer roller 4 adheres to the return outer peripheral surface of the ink source roller 8 and rotates together with the ink returned from the ink transfer roller, and rotates.
It is scraped off by 3. The peripheral surface of the ink source roller 8 immediately before the ink is ejected from the ink supply nozzle 12,
Since the returned ink is in a solid state from which the ink has been removed, fresh ink can always be sent from the ink source roller 8 to the ink transfer roller 4.

The uniform ink film transferred from the ink source roller 8 to the ink transfer roller 4 is transferred to the next rubber roller 5 which is in pressure contact with the roller 4, and passes through the next roller sequentially to form the ink forming roller. It is supplied to the plate cylinder 1 via 2a and 2b. In this inking device, the doctor blade 7 for eliminating history is moved from the plate cylinder 1 to the doctor roller 6.
Since the remaining ink containing the dampening solution is scraped off, fresh ink is always received from the rubber roller 5 and supplied to the plate cylinder 1.

As described above, in the ink supply device 10 of the present invention, the positions of the rotational direction scraper 13, the ink supply nozzle 12, and the ink supply doctor 15 of the ink source roller 8 are respectively reversed from the conventional positions. For,
It has the following effects: Scraper 13 is ink supply nozzle 1
Since the ink supply nozzle 12 is attached to the upper portion of the ink supply nozzle 12, it can be easily pushed or replaced periodically without removing the ink supply nozzle 12. Therefore, the return ink adhering to the return side peripheral surface of the ink source roller 8 can always be reliably removed. Since the ink supply nozzle 12 is located above the ink supply doctor 15, cleaning work when paper dust or the like is clogged in the nozzle and setting of a gap between the nozzle tip and the ink source roller 8 do not open the ink supply doctor 15. However, the workability is greatly improved.

The ink source roller 8 rotates in the direction of lowering the ink jetting surface, and the scraper 13 is mounted on the upper surface of the ink supply nozzle 12, so that ink transfer from the ink source roller 8 to the ink transfer roller 4 is performed. The state is easily visible. Therefore, the occurrence of an abnormality such as nozzle clogging can be detected at an early stage, the occurrence of waste paper can be prevented in advance, and stable ink supply can be achieved. Therefore, the present invention can provide an ink supply device that can greatly improve workability and always supply fresh ink to ensure stable quality printing.

[0018]

According to the ink supply device for a printing press of the present invention, the scraper is mounted on the upper surface of the ink supply nozzle, the ink supply doctor is disposed below the ink supply nozzle, and the ink source roller is moved relative to the ink ejection surface. The scraper can be attached to the upper part of the ink supply nozzle because it is rotated in the unwinding direction. Therefore, it is possible to easily push or replace the scraper periodically without removing the ink supply nozzle. Since the ink supply nozzle is located above the ink supply doctor, cleaning work when paper dust is clogged in the nozzle and setting the gap between the nozzle tip and the ink source roller can be easily performed without opening the ink supply doctor. Workability is greatly improved.

Since the ink source roller rotates in the direction of lowering the ink jetting surface and the scraper is mounted on the upper surface of the ink supply nozzle, the state of ink transfer from the ink source roller to the ink transfer roller can be easily visually checked. it can. Therefore, the occurrence of an abnormality such as nozzle clogging can be detected at an early stage, the occurrence of waste paper can be prevented in advance, and stable ink supply can be achieved.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a printing unit to which an ink supply device according to an embodiment of the present invention is applied.

FIG. 2 is a sectional view of a main part of the ink supply device of FIG. 1;

FIG. 3 is a schematic diagram of a printing unit to which an ink supply device according to a conventional example is applied.

FIG. 4 is a sectional view of a main part of the ink supply device of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plate cylinder 2a, 2b Ink application roller 3 Ink reciprocating roller 4 Ink transfer roller 5 Rubber roller 6 Doctor roller 7 Doctor blade 8 Ink source roller 9 Ink fountain 10 Ink supply device 12 Ink supply nozzle 13 Scraper 14 Ink supply pipe 15 Ink supply doctor 16 Supply blade 17 support

Claims (1)

[Claims] 1. An ink supply roller disposed on an ink fountain, an ink supply nozzle for ejecting ink to a peripheral surface of the ink supply roller, and a return ink adhering to the peripheral surface of the ink supply roller. An ink supply device comprising: a scraper for removing; and an ink supply doctor for forming an ink layer sprayed on a peripheral surface of an ink source roller into an ink film having a uniform thickness. An ink supply device for a printing press, wherein the ink supply doctor is disposed below the ink supply nozzle, and the ink supply roller is rotated downward with respect to the ink ejection surface.