JPH10244653A - Printer - Google Patents

Abstract

(57) [Problem] To provide a printing press capable of preventing surplus ink scraped by a doctor and containing foreign matter from re-adhering to a plate cylinder. The printing press includes an ink pan P and an ink pan P.
And a finisher roll 4 disposed in the ink pan P. A doctor 5 is provided on the surface of the plate cylinder 2 so as to be freely contactable, and a liquid dripping preventing plate 30 is provided below the doctor 5. Liquid dripping prevention plate 3
Numeral 0 is for receiving surplus ink scraped off by the doctor 5 and including foreign matter, and leading the ink into the ink pan P.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a printing machine such as a gravure printing machine.

[0002]

2. Description of the Related Art Generally, a gravure printing machine has a plate cylinder, and an ink pan is provided below the plate cylinder. A furnisher roll is rotatably installed so as to be partially immersed in the ink in the ink pan, and the furnisher roll is in contact with the peripheral surface of the plate cylinder, and the rotation sends the ink to the plate cylinder surface to adhere thereto. It has become. An excess amount of the ink adhered to the plate cylinder surface and used for printing is removed by a doctor provided on the peripheral surface of the plate cylinder. Further, an impression cylinder is in contact with the upper surface of the plate cylinder, and paper is printed between the plate cylinder and the impression cylinder.

[0003] The ink in the ink pan is discharged into an ink tank arranged below the ink pan, and the ink in the ink tank is filtered by a pump and the viscosity and the viscosity of the ink.
Through the temperature controller, foreign substances are removed and the viscosity and temperature are adjusted. The high-quality ink is supplied again into the ink pan.

[0004]

During printing, high-quality ink in the ink pan is supplied to the cells of the plate cylinder by a furnisher roll, and the ink overflowing from the cells is scraped off by a doctor and falls into the ink pan by gravity. .
The surplus ink scraped off by the doctor contains foreign matter generated by friction between the doctor and the plate cylinder surface. The surplus ink drops into the ink pan due to gravity as described above, but at this time, it may adhere again to the plate cylinder. When the surplus ink including the foreign matter scraped off by the doctor and reattached to the plate cylinder in this way, a defective product is produced in the printed matter printed by the plate cylinder.

[0005] The present invention has been made in view of such a point, and an object of the present invention is to provide a printing machine which can prevent re-adhesion of excess ink scraped off by a doctor.

[0006]

SUMMARY OF THE INVENTION The present invention provides an ink pan, a plate cylinder located above the ink pan, a means for supplying ink to the plate cylinder surface, and a plate cylinder for removing excess ink on the plate cylinder surface. A printing machine comprising: a doctor in contact with a surface; and a liquid drip prevention plate disposed below the doctor to receive excess ink removed by the doctor and guide the ink to an inside of an ink pan.

According to the present invention, ink is supplied to the plate cylinder surface by the ink supply means, and excess ink on the plate cylinder surface is removed by the doctor. Excess ink removed by the doctor is received by the liquid dripping prevention plate and guided into the ink pan.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are views showing an embodiment of a printing press according to the present invention. 1 and 2
As shown in (1), the printing press includes a plate cylinder 2 and an ink pan P installed below the plate cylinder 2. In addition, ink pan P
The printing ink 3 is supplied and stored therein as described later. Further, a furnisher roll 4 is rotatably installed in the ink pan P so as to be partially immersed in the ink 3, and the peripheral surface of the furnisher roll 4 is in contact with the peripheral surface of the plate cylinder 2 from obliquely below. As is known, the furnisher roll 4 supplies the ink 3 to the peripheral surface of the plate cylinder 2 while rotating, and the rotation directions of the plate cylinder 2 and the furnisher roll 4 are as shown by arrows in FIG. . As shown in FIG. 1, an impression cylinder 7 is pressed against the upper surface of the plate cylinder 2, and paper 6 to be printed is passed between them in the direction of the arrow to be fed.

A doctor 5 is provided so as to be in contact with the plate cylinder 2. Below the doctor 5, there is provided a liquid dripping prevention plate 30 for receiving the excess ink removed by the doctor 5 and guiding it into the ink pan P. I have. That is, the surplus amount of the ink adhered to the peripheral surface of the plate cylinder 2 is scraped off by the doctor 5 and falls into the ink pan P along the liquid dripping preventing plate 30 as shown by the arrow 13. The doctor 5 is installed on the diametrically opposite side of the plate cylinder 2 with respect to the finisher roll 4.

As shown in FIG. 1 and FIG. 2, the ink pan P includes a first portion P containing the finisher roll 4.
1 and a second portion P2 below the doctor 5. The first portion P1 and the second portion P2 are separated by a rising partition wall 20. The partition wall 20 constitutes a means (hereinafter, referred to as an inflow prevention means) for preventing the ink from flowing directly from the second part P2 into the first part P1. As shown in FIG. 1, the bottom plate of the ink pan P has a
The portion P1 is inclined so as to be lower, and the first portion P1
Is connected to an ink outflow pipe 21 at the lowest position.

Further, as shown in FIG. 2, the ink pan P has a rising peripheral wall 22, which in the illustrated example has a quadrilateral shape. The partition wall 20 is fixed inside three adjacent sides of the quadrilateral peripheral wall 22 with a space between them, and the partition wall 20 is provided at a portion along one remaining side of the peripheral wall 22. Absent. A second partition wall 23 is integrally provided inside the remaining one side with a space therebetween, and the second partition wall 23 is installed so as to leave a gap 24 between both ends of the partition wall 20. Have been. In this way, a passage 25 is formed between the partition wall 23 and the remaining one side of the peripheral wall 22. The ink pan first portion P1 is formed by a space surrounded by the partition walls 20 and 23, and the ink pan second portion P2 is formed by a passage between the partition wall 20 and three sides of the peripheral wall 22.

Then, the first part P1 and the second part P2
Are connected to the passage 25. First part P
In the case of 1, communication is made through the gap 24. Passage 2
Reference numeral 5 communicates with the ink outlet pipe 21.

The ink outlet pipe 21 is connected to the ink tank 9. The ink in the ink tank 9 is supplied to a filter 11 and a viscosity / temperature controller 1 by a pump 10.
2, the ink inlet pipe 2 of the first part P1 of the ink pan.
7 is supplied. The bottom plate of the first portion P1 of the ink pan is preferably formed so as to form a slope descending toward the partition wall 23 as shown in FIG. As a result, the ink 3 dammed by the partition wall 23 is stored inside the first portion P1 as shown in FIG.
The lower part of the furnisher roll 4 will be immersed in it.

Next, the liquid dripping prevention plate 30 will be described in detail with reference to FIGS. As shown in FIGS. 3 and 4,
The liquid dripping prevention plate 30 is a rubber material portion 30 that abuts on the plate cylinder 2.
a and a support plate 30 for supporting the rubber material portion 30a from the back surface
The rubber portion 30a is made of NBR and has a thickness of 2 to 5 mm. The liquid dripping prevention plate 30 has substantially the same axial length as the plate cylinder 2, and its circumferential length is slightly longer than １ ／ of the circumferential length of the plate cylinder 2.

The support plate 30b of the liquid dripping prevention plate 30 is connected to the vertical frame 31 via a support portion 32 and a tilt adjusting portion 33. The tilt adjusting unit 33 is a vertical frame 31
, Whereby the inclination angle of the liquid dripping prevention plate 30 with respect to the plate cylinder 2 is variable.

Next, the operation of the embodiment having the above-described configuration will be described. 1 and 2, the ink stored in the ink tank 9 is supplied to the plate cylinder 2 during printing by the operation of the pump 10. As a result, the foreign matter is removed from the ink by the filter 11, and then passes through the viscosity / temperature controller 12 to become the ink whose viscosity and temperature are controlled.
1 and is dammed by the partition wall 23 to soak the furnisher roll 4. As a result, the ink is supplied to the plate cylinder surface by the action of the furnisher roll 4 as the plate cylinder 2 rotates.

The ink applied to the plate cylinder surface is used for printing after a surplus amount is scraped off by the doctor 5 with the rotation of the plate cylinder 2. The surplus ink is received by the liquid dripping prevention plate 30 and falls along the liquid dripping preventing plate 30 as shown by an arrow 13 to be stored in the second portion P2 of the ink pan P.

As described above, the surplus amount of the ink falls to the ink pan P side after being received by the liquid dripping prevention plate 30.
The surplus ink does not adhere to the plate body 2 again.
Further, since the liquid dripping preventing plate 30 abuts on the plate cylinder 2 by the rubber material portion 30a, the surface of the plate drum 2 is not damaged. Can be set appropriately.

By the way, when the doctor 5 comes into frictional contact with the surface of the plate cylinder 2, foreign substances are generated as a result of wear and the like, and the foreign substances are mixed in the ink. Therefore, the ink that falls into the second portion P2 is a contaminated ink containing foreign matter.

The contaminated ink in the second part P2 bypasses the first part P1 and flows into the passage 25 as shown in FIG.
This is done automatically due to the inclination of the bottom plate. On the other hand, the ink 3 having the effect of immersing the furnisher roll 4 in the first portion P1 similarly flows into the passage 25 through the gap 24, merges with the contaminated ink, and flows through the ink outlet pipe 21 into the ink tank 9. Return to For this reason, the ink in the ink tank 9 gradually contains foreign substances, and the quality is lowered. In this case, the ink in the ink tank 9 is
After the foreign matter is removed by passing through 1 and the viscosity / temperature controller 12 to obtain high quality, it is sent to the plate cylinder 2 again. In this way, it is possible to prevent contaminated ink containing foreign matter from being supplied to the plate cylinder 2 again. The surplus ink scraped off by the doctor 5 and containing foreign matter can be received by the liquid dripping prevention plate 30, so that the surplus ink containing foreign matter does not adhere to the plate cylinder 2 again.

In the above embodiment, the rubber material portion 3
0a is brought into contact with the plate cylinder 2, but the rubber material portion 3
0a may be located on the plate cylinder 2 side and may be separated from the plate cylinder 2. Although the ink in the first portion P1 of the ink pan P flows into the passage 25 through the gap 24, the gap 24 is eliminated, and the ink in the first portion P1 overflows the partition wall 23 and flows into the passage. You may do so.

[0022]

As described above, according to the present invention, surplus ink containing foreign matter scraped off from the plate cylinder surface by the doctor is received by the liquid dripping prevention plate and guided into the ink pan. Excess ink including foreign matter does not adhere again to the plate cylinder. For this reason, it is possible to prevent the occurrence of a defective printed matter.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional front view showing an embodiment of a printing press according to the present invention.

FIG. 2 is a plan view of the ink pan shown in FIG.

FIG. 3 is an enlarged view of a main part of FIG. 1;

FIG. 4 is a perspective view showing a liquid dripping prevention plate.

[Explanation of symbols]

 2 Plate cylinder 3 Ink 4 Furnisher roll 5 Doctor 6 Paper 7 Impression cylinder 9 Ink tank 10 Pump 11 Filter 12 Viscosity / temperature controller P Ink pan P1 First part of ink pan P2 Second part of ink pan 20 Prevents inflow of ink directly Means (partition wall) 21 Ink outflow tube 22 Ink pan peripheral wall 23 Partition wall 24 Gap 25 Passage 27 Ink inflow tube 30 Liquid dripping prevention plate 30a Rubber portion 30b Support plate 31 Frame 32 Support portion 33 Tilt adjusting portion

Claims (3)

[Claims] An ink pan, a plate cylinder positioned above the ink pan, means for supplying ink to the plate cylinder surface, a doctor contacting the plate cylinder surface so as to remove excess ink on the plate cylinder surface, A printing press provided with a liquid dripping prevention plate which is disposed below and receives excess ink removed by the doctor and guides the ink into the ink pan. 2. The printing press according to claim 1, wherein the liquid dripping prevention plate comprises a rubber portion located on the drum side and a support plate for supporting the rubber portion. 3. The printing press according to claim 2, wherein the support plate is connected to the frame via a tilt adjusting portion, whereby the rubber portion can be tilted with respect to the plate cylinder surface.