JP2527289Y2 - Electrode device for preventing paper floating of sheet-fed printing press - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode which is installed close to the surface of an impression cylinder of a sheet-fed printing press, and which prevents the paper on the impression cylinder from floating.

[0002]

2. Description of the Related Art FIG. 2 shows an arrangement of a printing cylinder in a general sheet-fed printing press, and FIG. 3 is a sectional view of an electrode and a guide bar. The ink is printed on the paper 3 via the plate cylinder 1 and the blanket cylinder 2. There is a light source 4 and a sensor 5 to monitor print quality. The electrode unit 7 is placed so that the paper 3 does not float on the impression cylinder 6, and the paper 3 is electrostatically transferred to the impression cylinder 6.
Is attached to The paper is sent to the next printing unit via the intermediate cylinder 8.

The electrode 9 is embedded in a guide bar 10. A high voltage is applied between the electrode 9 and the impression cylinder 6, and the paper 3 is electrostatically attached to the impression cylinder 6.

[0004]

The above prior art has the following problems. The paper dust generated during the printing operation and the powder sprayed on the printing surface are free in the air and adhere to the electrodes. When paper powder or powder adheres to the tip of the electrode 9 in this manner, the effect of adhering the paper to the impression cylinder decreases. If the adhesion of the paper 3 to the impression cylinder 6 is not stable, the paper will float or flutter, and the output of the sensor 5 will be a signal of poor quality. Therefore, regardless of the complete printing, a signal of poor quality is generated, and the reliability of quality control is reduced. In addition, the electrode portion must be cleaned in a short time, which is very inconvenient in operation.

An object of the present invention is to provide an electrode device for preventing paper floating of a sheet-fed printing press which can prevent paper powder, powder and the like from adhering to the tip of an electrode and can always maintain an electrode portion in a clean state. It is intended for.

[0006]

As shown in FIG. 1, an air passage 11 is provided inside a guide bar 10, and air is constantly blown from a nozzle 12 communicating with the air passage 11 to the tip of an electrode 9. Squirt.

[0007]

The function of the electrode 9 is as follows.
Paper powder, powder, etc. that have floated nearby are blown away,
It does not adhere to the electrode 9 and the tip of the electrode 9 is always kept clean.

[0008]

FIG. 1 shows an embodiment of the present invention. 2, reference numeral 9 denotes an electrode, 10 denotes a guide bar, 11 denotes an air passage, 12 denotes a nozzle, and 13 denotes an air source. The overall arrangement is the same as that of the prior art shown in FIG. The relative positions of the electrode 9 and the guide bar 10 with respect to the impression cylinder 6 are the same as those in the prior art. However, in the present invention, an air passage 11 is formed inside the guide bar 10, and the nozzle 9 communicating with the air passage 11 passes through the electrode 9. Blows air toward. A plurality of electrodes 9 are provided in the width direction of the impression cylinder 6, and a nozzle 12 is provided for each electrode 9. Air is supplied to the air passage 11 from an air source 13.

In this manner, the paper flow, powder, and the like near the electrode 9 are blown off by the air flow ejected from the nozzle 12, and the tip of the electrode 9 is kept clean. It is to be noted that the jet flow is not always constant, but is effective even if it is intermittently supplied.

[0010]

[Effect of the invention] By supplying the jet from the nozzle 12 toward the tip of the electrode 9, adhesion of paper powder or powder can be prevented, and the tip of the electrode can be always kept clean. 2. As a result, the effect of adhering the paper 3 to the impression cylinder 6 can be always exerted, and a false signal (misjudgment) due to floating of the paper or flapping can be avoided, and the reliability of print quality management can be improved. Can be. 3. Conventionally, electrodes have been cleaned in a short period of time, but the present invention makes maintenance free.

[Brief description of the drawings]

FIG. 1 is a sectional view of an electrode device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a conventional print quality monitoring system.

FIG. 3 is a configuration diagram of a conventional electrode device.

[Explanation of symbols]

 9 electrode 10 guide bar 11 air passage 12 nozzle

Claims (1)

(57) [Scope of request for utility model registration] In an electrode for preventing the paper from floating from an impression cylinder in a sheet-fed printing press, an air passage is formed in a guide bar that supports the electrode, and the air is communicated with the air passage and air is directed toward the tip of the electrode. An electrode device for preventing paper floating of a sheet-fed printing press, wherein a nozzle for jetting is provided near an electrode.