JPH04122034U - rotary printing machine - Google Patents

Abstract

(57) [Summary] [Purpose] To effectively remove paper dust from continuous running paper fed into a printing unit. [Structure] An air injection nozzle 5 and an air suction pipe 6 are provided on the paper transport side of the printing unit 1. Air is injected from an air injection nozzle 5 in the opposite direction to the transport direction of the continuous running paper A, and the air that collides with the continuous running paper A and is reflected is sucked by an air suction pipe 6.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to a rotary printing press that prints on continuous running paper.

0002

[Conventional technology]

Continuously running paper supplied to newspaper rotary presses has paper dust attached to it. If you print while the paper is wet, paper dust will come into contact with the printing unit due to contact with the continuously running paper. It adheres to the blanket cylinder or plate cylinder that forms the paper, and the adhesion causes dirt on the continuous running paper. There are problems such as text and graphics becoming unclear.

0003 In order to solve this problem, we removed the paper dust from the continuously running paper before printing it on the printing unit. In some cases, printing is performed by passing continuous running paper through the paper.

0004 As a method for removing paper dust, an air suction pipe installed in the transport path of continuously running paper is used to remove paper dust. A method of suctioning paper dust adhering to continuously running paper is conventionally known.

[0005]

[Problem that the idea aims to solve]

By the way, with the method of suctioning paper dust, the removal rate of paper dust is low in the case of newsprint. Paper dust remains on continuous running paper in a state where it is easy to peel off, so it solves printing problems caused by paper dust. I can't decide.

[0006] This idea is based on a technical technique that aims to improve the removal rate of paper dust that adheres to continuous running paper. This is an issue.

[0007]

[Means to solve the problem]

In order to solve the above problems, this invention uses continuous In a rotary printing press equipped with a printing unit equipped with a plate cylinder in the transport path of running paper, the above-mentioned On the paper inlet side of the printing unit, cover the entire width of the printing surface of the continuous paper. An air suction pipe that sucks air across the air, and an air suction pipe placed close to this air suction pipe This is an device that injects air across the entire width of the printing surface of continuous paper. A configuration with a spray nozzle was adopted.

[0008] It also improves the stability of continuous paper transport and removes paper dust more effectively. In order to Then, change the air suction direction of the air suction pipe from the air jet pipe to the continuous running paper. The direction is the same as the reflection direction of the air colliding with the paper, and the back side of the continuous running paper is A configuration was adopted in which a backup roller was provided on the side.

[0009]

[Effect]

The rotary printing press with the above configuration uses air spraying from an air injection nozzle. Then, the paper dust from the continuously running paper is removed by the suction power of the air suction pipe.

0010

【Example】

As shown in Figure 1, there are markings printed on the continuous paper A on the transport path. A printing unit 1 is provided. The printing unit 1 shown in the embodiment has a plate cylinder 3 in contact with each of a pair of blanket cylinders 2. It consists of a double-sided structure and prints on both sides of the continuous running paper A using a pair of blanket cylinders 2. I'm doing it.

[0011] There are two bags on the paper transport side of the printing unit 1 that guide the transport of the continuous paper A. Backup rollers 4a, 4b are provided, facing each backup roller 4a, 4b. An air injection nozzle 5 and a pair of air suction pipes 6 are provided.

0012 As shown in FIG. 2, the air injection nozzle 5 is a pipe that is long in the width direction of the continuous paper A. , and an air injection slit 7 is formed on one side facing the continuous running paper A. Then, air is injected from the slit 7 over the entire width direction of the continuous paper A. The sea urchin is turning. The air jet direction is opposite to the transport direction of continuous paper A. It has become.

[0013] On the other hand, the air suction pipe 6 also has an air suction slit on one side facing the continuous running paper A. A suction force is applied to the entire width of the continuous paper A through the slit 8. It is now granted. The direction of the suction force is continuous from the air injection nozzle 5. It is in the same direction as the direction of reflection of the air colliding with the line paper A.

[0014] As mentioned above, by combining the air injection nozzle 5 and the air suction pipe 6, As a result, the paper that adheres to the traveling paper A due to the collision of the air jetted from the air jet nozzle 5 The powder is blown away.

[0015] At this time, the air jet direction is opposite to the transport direction of the continuous running paper A, Continuously running paper A is supported by backup rollers 4a and 4b to prevent it from flapping. Because of this, it is possible to remove paper dust that adheres to continuous running paper A very effectively. can.

[0016] On the other hand, the air suction pipe 6 collides with the continuous running paper A from the air injection nozzle 5 and rebounds. Since the emitted air is sucked, the paper powder that has peeled off from the paper surface does not fly up to the surroundings, and the above-mentioned Paper dust can be removed hygienically.

[0017] In the case of the embodiment, the air suction pipe 6 and the air injection nozzle 5 are Although it is shown that the air suction pipe 6 and the air injection nozzle 5 are installed in order in the feeding direction, Reverse the position and spray air from the air jet nozzle 5 onto the continuous running paper A to blow away the paper dust. After that, the suction force of the air suction pipe 6 is applied. Paper dust remaining on the paper surface may be removed.

[0018]

[Effect of the idea]

As mentioned above, in the rotary printing press according to this invention, the air injection nozzle Air is blown onto the continuous running paper using the air suction pipe, and suction force is applied to the continuous running paper using the air suction pipe. This makes it possible to remove paper dust that adheres to continuous running paper very effectively. It is possible to improve the removal rate of paper dust.

[0019] In addition, air is ejected from the air injection nozzle in the opposite direction to the transport direction of the continuous paper. The air that collides with the continuous running paper and is reflected is sucked by the air suction pipe, and the continuous running paper is By installing a backup roller on the back side of the air impact surface, paper dust can be removed. can be removed more effectively.

[Brief explanation of drawings]

[Fig. 1] A schematic diagram showing an embodiment of a rotary printing press according to this invention.

[Figure 2] Cross-sectional view showing an enlarged view of the main parts of the above

[Figure 3] Partially cutaway plan view of Figure 2

[Explanation of symbols]

1 Printing unit 3 Plate cylinder 4a, 4b Backup roller 5 Air injection nozzle 6 Air suction pipe

Claims (2)

[Scope of utility model registration request] 1. In a rotary printing press provided with a printing unit equipped with a plate cylinder in the transport path of continuous paper that is transported in one direction, on the printing surface of the continuous paper, on the paper inlet side of the printing unit, An air suction pipe that suctions air over the entire width direction, and an air jet nozzle that is arranged close to the air suction pipe and jets air over the entire width direction of the printing surface of the continuous running paper. A rotary printing press featuring 2. The rotary printing press according to claim 1, wherein the air injection direction of the air injection nozzle is opposite to the transport direction of the continuous running paper, and the air suction direction of the air suction pipe is
A rotary printing machine characterized in that a backup roller is provided in the same direction as the direction of reflection of the air that collides with the continuous running paper from the air injection pipe and on the back side of the continuous running paper with respect to the air collision surface.