JPH1177973A - Ink supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink supply device which is capable of storing a large quantity of ink for continuous printing and prevents the ink from sticking to a pressurizing key part when an ink fountain is cleaned. SOLUTION: The lower part of an ink fountain roller 2 is arranged in an ink fountain 1 and a blade 4 for controlling the thickness of an ink coat supported by a blade fizing device 5 is provided on the lateral wall of the ink fountain 1. The blade 4 for controlling the thickness of an ink coat is arranged below a pressurizing key 7 and the base side of the blade 4 is assembled into the ink fountain 1 and further, the tip part of the blade 4 is arranged obliquely upward so that it is brought into close proximity to the outer peripheral face of the ink fountain roller 2. The tip part of the blade 4 is arranged in such a manner that it is sandwiched between the ink fountain roller 2 and the pressurizing key 7. The tip part of the blade 4 can be pressed to the ink fountain roller 2 side by the pressurizing key 7 with the activation of a pressing device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an ink supply device capable of supplying a large amount of ink to a printing unit of an offset printing press.

[0002]

2. Description of the Related Art FIG. 3 shows a conventional blade type ink supply apparatus applied to a printing unit of an offset printing press. The apparatus includes one blade 4 for controlling the thickness of an ink film, a plurality of pressure keys 7 arranged in the width direction, and a pressurizing device that presses the blade 4 for controlling the film thickness via the pressure keys 7. And an apparatus 6. The blade 4 for film thickness control is disposed such that the tip end thereof is obliquely downward from the position above the pressing key 7 to approach the outer peripheral surface of the ink source roller 2, and is in contact with the outer peripheral surface of the ink source roller 2. There is a gap between the gaps from which ink can be drawn. The ink 8 supplied to the ink source roller is located above the gap,
The ink is stored in an ink fountain formed by the ink source roller 2 and the film thickness controlling blade 4. The transfer roller 3 is adjacent to the ink source roller 2.

[0003]

In the conventional ink supply device, the setting angle of the blade 4 for controlling the ink film thickness is determined, and the size of the ink source roller 2 is also limited. There is a problem that the amount of ink 8 is small and the number of continuous prints is limited. In addition, since the ink fountain is located above the pressure key 7, the ink leaks into the pressure key 7 when the ink fountain is washed, and the ink solidifies, thereby causing the movement of the pressure key to require accuracy. In the worst case, the pressure key may not work. The pressure key is complicated in order to maintain the accuracy, and there is also a problem that it is difficult to clean once the ink flows into the pressure key portion. The present invention has been made in view of the above problems, and provides an ink supply device that can store a large amount of ink for continuous printing and that does not adhere to the pressure key portion when cleaning the ink fountain. Aim.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method in which an ink source roller is provided between an ink source roller and an outer peripheral surface thereof.
In a blade-type ink supply device provided with an ink film thickness control blade arranged to form a gap, the ink source roller is brought into contact with the ink stored in the ink fountain, and the viscosity of the ink and the rotation of the ink source roller are used. The ink was drawn into the gap.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an ink supply device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a printing section of an offset printing press employing an ink supply device according to the present invention. As shown in the figure, an ink source roller 2 to which ink is supplied from an ink fountain 1 is rotatably disposed, and a rotatable ink transfer roller 3, a plurality of ink kneading rollers 12, A plurality of inking rollers 13 and a plate cylinder 11 having a printing surface
Are sequentially provided. A rotatable dampening solution supply roller group 14 and a watercraft 15 for providing an appropriate water film on the plate surface are disposed on the side of the plate cylinder 11.

FIG. 2 shows a blade type thin film ink continuous supply apparatus employing the present invention. At least the lower portion of the ink source roller 2 is arranged in a container-shaped ink fountain 1, and an ink film thickness controlling blade 4 supported by a blade fixing device 5 is provided on a side wall of the ink fountain 1. Blade 4 for controlling film thickness
And a pressure device 6 as a mechanism for adjusting the ink film thickness on the outer peripheral surface of the ink source roller 2. The pressure device 6 is disposed below the pressure key 7. In order to approach the outer peripheral surface of the roller 2, the roller 2 is arranged obliquely upward. Blade 4 for controlling film thickness and ink fountain 1
Has a structure in which ink does not leak. The angle of contact of the film thickness blade 4 with respect to the ink source roller 2 is as follows:
It is set based on the positional relationship between the ink fountain 1 and the ink source roller 2.
Naturally, the ink fountain 1 has a structure detachable from the ink source roller 2 for cleaning the ink.

The tip of the film thickness controlling blade 4 is disposed so as to be sandwiched between the ink source roller 2 and the pressing key 7. A plurality of pressure keys 7 are provided along the film thickness control blade 4, and are disposed so as to be movable in the horizontal direction by the action of the pressure device 6. Can be pressed toward the ink source roller 2 side. Therefore, the gap between the leading end portion 4 a of the ink film thickness controlling blade 4 and the ink source roller 2 is adjusted by changing the pressing force of the pressing device 6.

[0008] The configuration of the ink supply device according to the embodiment of the present invention has been described above, and its operation is as follows. After setting the ink fountain 1 and the ink source roller 2 at appropriate positions, the ink 8 is put into the ink fountain 1.
At this time, the ink 8 is supplied up to the lower surface of the ink source roller 2 or more. As shown in FIG. 1, the contact between the film thickness controlling blade 4 and the ink source roller 2 does not need to be filled with the ink 8. If the ink 8 and the ink source roller 2 are in contact with each other, the gap between the film thickness controlling blades 4 is filled with the ink 8 due to the viscosity of the ink 8, and the set ink film thickness is maintained. Is drawn out of the gap.

Then, a pressure key 7 is provided for each location in the width direction.
Is pressurized by a pressurizing device 6, and the ink source roller 2 is driven to rotate at a lower speed than the printing unit by a speed control motor (not shown), so that the ink 8 Is adjusted to a predetermined thickness. After the ink 8 is adjusted to a predetermined film thickness, the ink is transferred to the ink transfer roller 3 which is driven according to the speed of the printing unit, and the various rollers of the ink mixing roller group 12 and the ink forming roller group 13 are moved. After that, it is supplied to a printing plate (not shown) wound on the plate cylinder 11. Next, the ink 8 is transferred from the printing plate to a blanket cylinder (not shown), and printing is performed on paper that rolls and runs on the blanket cylinder.

As described above, in the present embodiment, in the blade type ink supply device, the ink fountain portion formed between the film thickness controlling blade 4 and the ink source roller 2 is replaced by the high viscosity of the ink and the ink source roller. Utilizing that the rotation speed of 2 is faster than that of a normal sheet-fed press, ink is stored in the ink fountain 1,
The ink is applied to the surface of the ink source roller 2 in the ink fountain part, and the ink film is structured so that only the required film thickness can be drawn out by the gap between the ink source roller 2 and the film thickness controlling blade 4. By reviewing the position and structure of the ink fountain 1 in this manner, the amount of ink stored in the ink fountain can be greatly increased as compared with the conventional case, and long continuous printing can be performed with a single ink supply. Further, by disposing the ink fountain 1 below the ink key devices 4, 5, and 6, the problem of ink key sticking (impossibility of operation) due to ink leakage and the poor reproducibility of key operation can be solved. In the blade-type ink supply device, the ink fountain formed between the film thickness control blade 4 and the ink source roller 2 is changed to a high viscosity ink and the rotation speed of the ink source roller 2 from a normal sheet-fed machine. Utilizing the fact that the ink is stored in the ink fountain 1, the ink source roller 2 causes the ink to adhere to the surface of the ink fountain 1 part, and the ink film is formed between the ink source roller 2 and the blade 4 for controlling the film thickness. With this configuration, only the required film thickness can be drawn out.

Although the embodiments of the present invention have been described above, the present invention is, of course, not limited thereto, and various modifications can be made based on the technical concept of the present invention. For example, the pressure key 7 of the pressure device 6 was used to adjust the film thickness of the ink 8, but the pressure device 6 may be of an automatic type or a manual remote control as long as the film thickness of the ink can be adjusted. The thickness of the ink can be adjusted by a device corresponding to the operation or the like. Further, although the blade 4 for controlling the ink film thickness is provided on the side wall of the ink fountain, it may be provided separately from the side wall.

[0012]

As described above, according to the present invention, at least the lower portion of the ink source roller is brought into contact with the ink stored in the ink fountain, and the ink is supplied to the gap by the viscosity of the ink and the rotational force of the ink source roller. Since the ink can be drawn out, a large amount of ink is stored in the ink fountain, thereby enabling a considerable amount of continuous printing. In addition, when the ink fountain is washed, the ink does not adhere to the pressure key portion, so that the failure of the pressure key due to the adhesion can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a printing unit of an offset printing press provided with an ink supply device according to an embodiment of the present invention.

FIG. 2 is a schematic side view of an ink supply device according to an embodiment of the present invention.

FIG. 3 is a schematic side view of a conventional ink supply device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 ink fountain 2 ink source roller 3 transfer roller 4 ink film thickness controlling blade 4a tip 5 blade fixing device 6 pressurizing device 7 press key 7a tip 8 ink 11 plate cylinder 12 ink mixing roller group 13 ink application roller group 14 dampening water supply roller group 15 water boat

Claims (1)

[Claims] 1. A blade-type ink supply device having an ink film thickness control blade disposed so as to form a gap between an ink source roller and an outer peripheral surface thereof.
An ink supply device, wherein the ink supply roller is brought into contact with the ink stored in the ink fountain, and the ink is drawn out to the gap by the viscosity of the ink and the rotation of the ink supply roller.