JPH059169Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to an inking device of a printing press, and in particular,
This invention relates to an ink blade for a printing press in which a rectangular metal thin piece is divided by slits according to the number of ink bands, and each divided piece is a cantilevered tongue piece.

(Background of the invention) In an inking device of a printing press, an ink fountain is composed of a doctor roller that is driven and rotated and an ink blade made of a thin metal piece. By changing the gap between the tip of the ink blade and the outer periphery of the doctor roller using an operating mechanism such as a screw, the amount of ink discharged can be adjusted for each ink band (for example, divided into 32 bands). It's becoming controlled.

(Prior Art) Regarding the ink blade, initially, a single long metal thin piece was used as it is, but with this, strict control of the amount of ink discharged for each ink zone cannot be performed.

Therefore, regarding U.S. Patent No. 2837024,
An ink blade consisting of a rectangular metal thin piece is divided by slits according to the number of ink bands, each divided piece is made into a cantilevered tongue piece, and the upper surface of the tongue piece is covered with a sheet, A technique has been disclosed that prevents ink from leaking from the slit. According to this, although the control of the ejection amount for each ink band is improved and ink leakage from the slits is also prevented, the amount of discrepancy between adjacent tongues is limited, causing problems in the accuracy of control. There is,
In addition, the sheet had a drawback in that it was defective and easily damaged when cleaning the ink blade.

To overcome these drawbacks, U.S. Patent No.
In the case of No. 3855927, an elastic body is fixed to the slit between each tongue of the ink blade divided into cantilever-like tongues, thereby preventing ink leakage and making it possible to prevent ink from leaking. A technology has been disclosed that allows for free control.

According to this technique, the problems associated with using a sheet as in the prior art described above are completely eliminated. However, an elastic body such as rubber fixed to the slit exhibits considerable shearing resistance when controlling the discharge amount so that adjacent tongues are offset from each other.

Therefore, there was a drawback that the slit had to be made wide in order to make the width of the elastic body wide.

(Problem to be solved by the invention) However, when the elastic body between the tongues is set to have a wide width, the ink is discharged from the part of the elastic body (that is, the slit part) due to the ink discharge pressure. The amount of ink that is discharged in excess of the desired amount cannot be controlled by the operation of each tongue, and the ink becomes a raised streak on the surface of the doctor roller. Such streaks cannot be eliminated even by a doctor roller that is driven and rotated and a large group of kneading rollers connected thereto, causing problems in printing quality.

(Outline of the invention) The present invention was made in view of the above problems and provides an advanced ink blade.The purpose of the invention is to enable free operation of each tongue piece, and to
The objective is to obtain an ink blade that does not leak ink.

Another object of the present invention is to obtain an ink blade that does not cause ink streaks on a doctor roller or the like.

Another object of the present invention is to obtain an ink blade with excellent durability.

In order to achieve the above object, the present invention provides an ink blade in which a rectangular metal thin piece is divided by slits according to the number of ink bands, and each divided piece is a cantilevered tongue. A stepped slit is formed with a fine width on the upper surface side and a relatively wide stepped slit on the lower surface side, and the fine width portion is filled with silicone adhesive, and the relatively wide portion is formed as a stepped slit. Each tongue piece is connected to the other by baking urethane rubber onto the tongue piece.

The silicone adhesive filled in the minute width area is
Since it does not show any shearing resistance against the misalignment of adjacent tongues, it fits perfectly into the narrow slit and prevents ink from leaking.
Furthermore, since the width is fine, there is no possibility that the ink will bulge due to the ink discharge pressure. On the other hand, the urethane rubber in the relatively wide portion backs up the silicone in the fine width portion, completely preventing ink leakage and ensuring the durability of the ink blade of the present invention. Furthermore, since the tongue is relatively wide, unnecessary shearing resistance is less likely to occur against the operation of the tongue.

According to the ink blade of this invention, while preventing ink leakage and ensuring sufficient operating performance and durability, it completely prevents the occurrence of ink streaks caused by the slit to which a wide elastic body is fixed, resulting in good printing. Quality can be achieved.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the ink blade of a printing press according to the present invention, FIG. 2 is a plan view of the ink blade shown in FIG. 1, and FIG. FIG. 4 is a sectional view taken along the - line in FIG. 1.

The ink blade 1 is made of a rectangular thin metal piece.
It is divided by slits 2 perpendicular to the longitudinal direction according to the number of ink bands, and each divided piece is a cantilevered tongue piece 3. In this embodiment, the slit 2 is simply a straight line, but the slit 2 is not limited to this, and may have a T-shape or a Y-shape.
Further, 4 indicates a mounting hole.

The slit 2 on the upper surface side of the ink blade 1 (the side with which the ink actually contacts) is preferably formed to have a fine width of about 0.2 to 0.4 mm. Such fine width metal processing is possible by laser processing. Furthermore, the slit 2 on the lower surface side (it can be said that there is virtually no ink contact here) is cut out to a relatively wide width of about several mm. The slit 2 is therefore formed as a stepped slit, as best shown in FIG.

The stepped slits 2 allow each tongue 3 to be operated independently as a cantilever, but each slit 2 is designed to prevent ink from leaking without interfering with the operation of the adjacent tongue 3. must be done.

In the ink blade 1 of this invention, silicone adhesive 5 is applied to the fine width part of the stepped slit 2.
is filled. Since the silicone adhesive 5 does not exhibit any particular resistance to shearing force, even if a large amount of discrepancy occurs in the fine width slit 2 due to the necessity of controlling the ink discharge amount, the silicone adhesive 5 does not exhibit any particular resistance to shearing force. It can be tracked without peeling and prevents ink leakage.

However, since the upper surface of the ink blade 1 is frequently washed, it is possible that the silicone adhesive 5 may be missing due to this washing.

Therefore, urethane rubber 6 is baked onto the relatively wide bottom side of the slit 2 to prevent ink from leaking even if the silicone adhesive 5 is missing. The urethane rubber 6 does not exhibit excessive resistance to shear deformation in the relatively wide slit 2 portion.

Incidentally, the baked urethane rubber 6 is not damaged at all even by washing, and by refilling the silicone adhesive 5 at appropriate intervals of operation, the ink blade 1 of the present invention is extremely durable. It will be excellent.

FIG. 5 shows the ink blade 1 according to the present invention mounted on an inking device. are doing. Further, in order to adjust the gap between the tip of the ink blade 1 and the doctor roller 9, an actuator 10 is configured to abut against the lower surface of the ink blade 1, and this actuator 10 has a tapered part 11. It is designed to be moved up and down by a screw 12.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the ink blade of a printing press according to the present invention, FIG. 2 is a plan view of the ink blade shown in FIG. 1, and FIG. Figure 4 is a cross-sectional view taken along the - line in Figure 1;
The figure is a side sectional view showing the state of use. 1... Ink blade, 2... Slit, 3...
... tongue piece, 5 ... silicone adhesive, 6 ... urethane rubber.

Claims (1)

[Scope of Claim for Utility Model Registration] An ink blade for a printing machine in which a rectangular metal thin piece is divided by slits according to the number of ink bands, and each divided piece is a cantilevered tongue piece, wherein the slit is an ink blade. A stepped slit is formed with a fine width on the upper surface side and a relatively wide stepped slit on the lower surface side, and the fine width portion is filled with silicone adhesive, and the relatively wide portion is formed as a stepped slit. Each tongue piece is connected with urethane rubber baked into it.