JPH10291296A - Apparatus for prevention of scattering of ink mist for printing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sharply decrease floating-ink mist, while a necessity for cleaning an ink cover is eliminated by a method wherein an ink cover is provided in a direction for sealing an ink mist generation source of an ink roller group, and an ink curtain is formed by utilizing the ink flowing down from a lower end of the ink cover. SOLUTION: Ink 1 fed via an ink feed doctor 3, after being transferred along an outer peripheral surface of an ink fountain roller 4, is delivered to a downstream side via a nip part to a delivery roller engaged therewith. The ink drop scattered almost tagentially at the nip part is stuck to an under side surface of an ink cover 14. Further, the ink 1 having overflown from the ink feed part flows down on an upper surface of the ink cover 14 to form an ink curtain at a lower end of the ink cover 14. The ink mist is recovered in an ink tank 2 together with the ink drop under a state where it comes in contact with the ink curtain 15 and is joined midway to scatter floating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-scattering device for preventing fine ink mist and the like generated in a process of transferring and supplying ink in an ink roller group of a printing press, and includes a lubricating oil and other oils. Applicable to mist scattering prevention device.

[0002]

2. Description of the Related Art FIG. 7 is an explanatory view of an example of a conventional apparatus for preventing the scattering of ink and ink mist installed in an ink roller unit for a printing press, and FIG. 8 is an explanatory view of problems remaining in the conventional printing press. . In such a printing press, as shown in FIG.
After the ink 51 is supplied from an ink tank 52 to an ink source roller 54 via an ink pump (not shown) and an ink supply doctor 53, the ink 51 is appropriately kneaded in the process of sequentially transferring the ink rollers 56 from the transfer roller 55. And a plate cylinder 58 passing through a pair of inking rollers 57 as an ink film.
It is configured to be transmitted to the upper printing plate 59 and further transferred to a printing medium 61 such as newsprint via a blanket cylinder 60. In addition, a history doctor 62 and a doctor roller 63 are provided in association with the group of ink rollers 56, and the history doctor 62 has a function of scraping excess ink on the outer peripheral surface of the doctor roller 63 and feeding it back to the ink tank 52. ing.

[0003] In the group of the plurality of ink rollers 56, when the ink is torn between the rollers, there is a problem that a thin filament of the ink is cut and the ink and the ink mist are scattered. Therefore, the printing press is provided with a device for preventing ink and ink mist from scattering. In the conventional device for preventing scattering, only the ink cover 64 is provided near the ink mist generating portion. Therefore, after the ink fluid collides with the ink cover 64, it flows down along the slope and is collected into the ink tank 52 located below.

[0004]

However, in the above-mentioned conventional scattering prevention device, as shown by the arrow M in FIG. 8, the gap of the ink 51 where the fine ink mist flows down from the ink cover 64, that is, the lower end gap S Through
There was a problem that it leaked to the outside O. The ink cover 64 cannot be installed without a gap due to its structure, and the outflow of the ink mist cannot be avoided.
For this reason, an ink mist scatters and floats in the air and adheres to the building, or a “misting phenomenon” in which the ink mist falls on a printing machine, a printed matter, or the like occurs, thereby deteriorating the working environment.

The present invention has been made in view of such a situation, and an object of the present invention is to eliminate the need for cleaning the ink cover and to reduce the amount of floating ink mist as compared with the related art. An object of the present invention is to provide a device for preventing ink mist from scattering.

[0006]

In order to solve the problems of the prior art, according to the present invention, an ink cover is provided in a printing machine in a direction in which an ink mist generation source of an ink roller group is sealed, and the ink cover is provided. Means for forming an ink curtain using ink flowing down from the lower end of the ink curtain. That is, the ink mist generated by the engagement rotation of the ink roller is provided with an ink cover positioned on the side of the scatter prevention direction, and the ink mist is formed by using the ink flowing down from the ink cover. Means to prevent scattering.

In the ink mist scattering prevention device for a printing press according to the present invention, an ink curtain utilizing the ink flow is formed at the downstream end of the ink cover based on the above structure, and the lower end of the ink curtain is a shielded object or directly. Since the structure is such that the ink mist flows into the ink tank, there is no gap below the ink cover (ink curtain), so that the ink mist does not float and flow out. The ink curtain draws the surrounding air by the falling flow, causing a downward flow. This flow causes the ink mist to be attracted to the ink curtain and easily adheres to the ink curtain because of its good affinity. These actions increase the degree of ink mist capture.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on illustrated embodiments.

FIG. 1 is an explanatory view of a structural example of a printing machine equipped with an ink mist scattering prevention device according to the present invention, and FIGS. 2 to 6 are inks which are main components of the ink mist scattering prevention device according to the present invention, respectively. It is explanatory drawing of the example of a formation means of a curtain.

An ink tank 2 for storing ink 1 is provided at an intermediate portion of the printing press in FIG. 1, and an ink supply doctor 3 is arranged above the stored ink 1. Also, at the position near the ink supply doctor 3,
An ink source roller 4 is rotatably disposed, and a transfer roller 5 rotatable in relation to the ink source roller 4, a group of a plurality of ink rollers 6, a pair of left and right ink forming rollers 7,
A plate cylinder 9 having a printing plate 8 and a blanket cylinder 10 are sequentially installed downward. Then, the adjacent ink source roller 4 and the transfer roller 5, the transfer roller 5 and the ink roller 6, the ink roller 6 and the ink forming roller 7,
The inking roller 7 and the plate cylinder 9, and the plate cylinder 9 and the blanket cylinder 10 are arranged in contact with each other. The printing medium 11 such as newspaper is provided so as to travel in the direction of the arrow while contacting the blanket cylinder 10. Further, a doctor roller 1 which comes into contact with the ink roller provided at the uppermost position is located near the ink roller 6 group.
The surplus ink that has not been taken on the printing plate 8 on the outer peripheral surface of the doctor roller 12 is scraped off by the history doctor 13 and collected in the ink tank 2.

On the other hand, at a nip portion between the ink source roller 4 and the transfer roller 5, that is, at a position close to a position where ink mist is most generated, as shown in FIG. An ink cover 14 is provided. The ink cover 14 constitutes an ink mist scattering prevention device according to the embodiment of the present invention, and an ink curtain 15 is formed at the lower end portion by utilizing the flow of the ink 1. Ink curtain 15
Are continuously formed over the entire upper and lower regions from the lower end of the ink cover 14 to the upper surface of the ink 1. For this reason,
The ink cover 14 is provided in a direction in which the ink mist generation source of the ink roller 6 group is sealed, and is formed in a substantially U-shape in front with an opening arranged upward. In addition, the upper end of the ink cover 14 is located just below the center of the ink source roller 4, the intermediate part is located below the front part of the hysteresis doctor 13, and the lower end is located above the ink 1 filled in the ink tank 2. It is arranged to be located at.

Next, an example of means for forming the ink curtain 15 according to the embodiment of the present invention will be described. The forming means shown in FIG. 2 and FIG. 3 has a plurality of obstacles 16 arranged in parallel near the downstream end on the upper surface side of the ink cover 14, and FIG. Stuck,
FIG. 3B shows a structure in which prismatic projections 16b are fixed.
(C) illustrates an example in which the triangular columnar projection 16c is fixed. The obstacles 16 are arranged linearly at predetermined intervals in the lateral width direction, and are installed so as to protrude from the upper surface of the ink cover 14 to a predetermined height position. In such a forming means, as shown by arrows in FIGS. 2A and 2B, all of the ink 1 flowing down along the upper surface of the ink cover 14 once collides with the obstacle 16 and is diffused in the width direction. At the same time, the flow path of the ink 1 is changed, and the ink 1 is caused to flow down along the outer peripheral side of each obstacle 16, and then is re-merged to form a continuous ink curtain 15. ing.

The forming means shown in FIG.
A mesh-like mesh plate 17 is suspended from the downstream end of the ink cover 14, and the upper end of the mesh plate 17 is attached to the lower surface of the ink cover 14. In such a forming means, the ink cover 1
The ink 1 flowing down along the upper surface 4 is caused to flow down along the surface (eyes) of the screen 17, and an ink curtain (ink film) 15 is formed on the screen 17.

The forming means shown in FIG.
An ink supply pipe 1 having a plurality of ink nozzles 18 formed at predetermined intervals in the horizontal width direction and located above the upper surface side of the ink supply pipe 1
9 is arranged horizontally, and one end of the ink supply pipe 19 is connected to an ink supply source (not shown). In such a forming means, the ink 1 is supplied from the cylinder end of the ink supply pipe 19 to eject the ink 1 from the ink nozzle 18, and the distribution amount of the ink 1 flowing down the upper surface of the ink cover 14 in the width direction is reduced. The ink curtain 14 is configured to be substantially uniform and to increase the amount of flow-down, thereby stabilizing the state of the ink curtain 15 formed at the lower end of the ink cover 14. The lower end of the ink cover 14 is shown in FIG.
As shown in (b), it is arranged above the ink tank 2 and just above the vicinity of the lower end of the hysteresis doctor 13. FIG. 6 shows a modification of the arrangement of the ink supply pipes 19 shown in FIG. 5B. An ink curtain 15 is formed at a lower end of the ink cover 14 and the ink supply doctor 3, respectively.

The ink 1 of the printing press is supplied from an ink tank 2 to an ink source roller 4 via an ink supply doctor 3 by an ink pump (not shown), and then transferred to a transfer roller 5 to be transferred to an ink roller 6. After being transferred to the inking rollers 7 and 7 via the group, the printing plate 8 is kneaded appropriately in the process and wound on the plate cylinder 9, and is supplied to the printing medium 11 via the blanket cylinder 10 to perform predetermined printing. Is applied. Further, the ink 1 sent from the ink pump is supplied to the ink supply roller 4 in front of the ink supply doctor 3.
While the ink 1 overflows, falls and falls on the upper surface of the ink cover 14, flows on the upper surface of the ink cover 14 that is arranged at a downward inclination, and falls into the ink tank 2 from the lower end.

In the ink mist scatter prevention device for a printing press having the above-described configuration, the ink 1 supplied through the ink supply doctor 3 is transferred along the outer peripheral surface of the ink source roller 4 as shown in FIG. Is transferred to the downstream side via a nip portion with the transfer roller 5 engaged with the transfer roller 5. The ink particles blown in the tangential direction in the nip portion adhere to the lower surface of the ink cover 14. Further, the ink 1 overflowing from the ink supply unit is supplied to the ink cover 14.
To form an ink curtain 15 at the lower end of the ink cover 14. While the ink mist scatters and floats, the ink mist contacts the ink curtain 15 and is collected together with the ink fluid into the ink tank 2 while being joined. The lower end of the ink curtain 15 comes into direct contact with the upper surface of the ink 1 filled in the ink tank 2, so that the gap can be completely closed.
Therefore, the ink mist scattered in the air is prevented from flowing out of the printing width portion to the outside, and various disadvantages of the related art are eliminated.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes are possible based on the technical idea of the present invention. is there. For example, the obstacle 16 illustrated in FIG.
There are various arrangement methods, such as disposing them in a plurality of rows on the upper lower end face of the ink cover 14 or disposing them in a zigzag manner. The ink mist scattering prevention device for a printing press can be variously modified without departing from the gist of the present invention.

[0018]

As described above, the ink mist scattering prevention device for a printing press according to the present invention is provided with an ink cover close to the ink mist generating portion of the printing press, and the ink flowing down from the downstream end of the ink cover. To form a thin ink curtain. Therefore, according to the ink mist scattering prevention device of the present invention, the following effects can be obtained. (1) While the scattered ink mist floats, it comes into contact with the ink curtain and merges with the ink flow, so that it can be reliably collected in the ink tank located below, and thus the curtain has a cover. As a result, cleaning of the ink cover becomes unnecessary. (2) Since the lower end of the ink curtain flows directly into the ink in the ink tank, the gap at the lower end of the ink cover can be closed and floating ink mist can be drastically reduced. (3) Since ink flying and ink mist are drastically reduced, problems and various problems caused by ink scattering are greatly improved.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing an example of a schematic structure of a printing press equipped with an ink mist scattering prevention device for a printing press according to an embodiment of the present invention.

FIG. 2 illustrates an example of a means for forming an ink curtain, which is a main component of the ink mist scattering prevention device for a printing press according to the embodiment of the present invention. FIG. 1B is a perspective view showing a state where obstacles are arranged as viewed from the direction of arrow P in FIG. 1, and FIG. 2B is a plan view showing a state where ink flows down along the outer peripheral side of the obstacle and then joins. .

FIG. 3 shows various shapes of obstacles arranged on the ink cover, wherein (a) is a plan view of a columnar projection,
(B) is a plan view of a prismatic projection, and (c) is a plan view of a triangular projection.

FIG. 4 is a perspective view for explaining another example of the forming means of the ink curtain, and showing a structure in which a mesh net plate is suspended at a downstream end of an ink cover.

FIG. 5 is a perspective view showing another example of the means for forming the ink curtain, in which (a) shows a structure in which an ink supply pipe provided with a plurality of nozzles is arranged upstream of an ink cover; (b) is a conceptual diagram showing a schematic structural example of a printing machine equipped with the ink cover of (a).

6 is a conceptual diagram showing a schematic structural example of a printing press provided with an ink cover according to a modification of FIG.

FIG. 7 is a conceptual diagram showing an example of a conventional apparatus for preventing ink and ink mist from being scattered provided in an ink roller unit of a printing press.

8 (a) is a perspective view showing a state in which ink mist flows out from a gap at a lower end of an ink cover to the outside, and FIG.
FIG. 3 is a side view of FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Ink 2 Ink tank 3 Ink supply doctor 4 Ink supply roller 5 Transfer roller 6 Ink roller 7 Ink application roller 8 Printing plate 9 Plate cylinder 10 Blanket cylinder 11 Printed object 12 Doctor roller 13 History doctor 14 Ink cover 15 Ink curtain 16 Obstacle 17 mesh netting 18 ink nozzle 19 ink supply tube

Claims (4)

[Claims] In a printing press, an ink cover is provided in a direction in which an ink mist generation source of an ink roller group is sealed, and means for forming an ink curtain using ink flowing down from a lower end of the ink cover is provided. An ink mist scattering prevention device for a printing press characterized by the following. 2. The method according to claim 1, wherein the ink curtain forming means is configured by arranging an obstacle which changes a flow path of the ink at predetermined intervals in a lateral width direction, which is positioned below an upper surface of the ink cover. The ink mist scattering prevention device for a printing press according to claim 1. 3. The ink curtain forming means is constructed such that a mesh net is suspended from a lower end of an ink cover, and ink is caused to flow down along the surface of the net. The ink mist scattering prevention device for a printing press according to claim 1. 4. An ink supply pipe having ink nozzles is provided horizontally at predetermined intervals in a horizontal width direction, wherein said ink curtain forming means is located above an upper surface of an ink cover,
2. The ink mist scattering prevention device for a printing press according to claim 1, wherein the ink is ejected from an ink nozzle of the ink supply pipe to increase the flow rate of the ink flowing down.