JPH065306Y2 - Static elimination roller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a roller device for removing static electricity from charged paper in a printing machine or the like.

[Conventional technology]

An example of a conventional static eliminator will be described with reference to FIGS. 4 and 5.

The one shown in FIG. 4 is composed of a discharge electrode 12 supplied with electricity from a high-voltage AC power source 13 and a discharge counter electrode 14 facing the discharge electrode 12, and an AC electric field generated between the discharge electrode 12 and the discharge counter electrode 14. Thus, the electric charge of the printing paper 9 passing therethrough is removed.

In FIG. 5, a sliding contact 16 such as a slip ring is directly attached to a general roller or rotating body 15 and the electric charge of the paper 9 is removed by introducing the electric charge from the contact to the earth pole 5.

[Problems to be solved by the device]

1. Technical issues In a printing press, a considerable amount of electrification is generated on the paper by the contact with each roller etc. while the printing paper is conveyed. This charge causes the paper to be drawn to the metal body, causing scratches on the paper that would otherwise come into contact with it, or even the parts that would have been conveyed smoothly would bend and cause problems. It often happens.

These examples will be described with reference to FIG. FIG. 6 (a) is a schematic diagram for explaining the configuration of the machine and the movement of the paper in the paper discharge section of the printing machine. The paper 9 cut after printing is sandwiched between the conveyor belt 7 and the guide rollers 8. The figure shows the situation where it is being transported from the right side to the left side. In this figure, the paper 9 discharged from the belt 7 is put into an impeller 10 having a plurality of wing-shaped pockets on the circumference, and then discharged on a conveyor 11 in the form of scales. At this time, if the paper 9 is charged as shown in FIG. 6 (a), it is adsorbed by the blades when it is inserted into the impeller 10 and cannot be smoothly inserted. As a result, the aligned state of the paper 9 discharged in the form of scales is deteriorated, and this greatly impairs the post process such as bookbinding.

2. Problems of the Prior Art The one shown in FIG. 4 is inferior in economic efficiency because the equipment cost of the high-voltage AC power source 13 and the like and the accompanying wiring work cost increase.

As shown in FIG. 5, the life and maintenance of the sliding contact are problems especially at high speed rotation.

[Means for Solving the Problems]

 1. A conductive protrusion is installed on the rotating body that is charged.

2. A conductive member facing the protrusion is placed on the non-rotating portion so as not to contact the protrusion.

3. The conductive member is grounded.

[Action]

The electric charges charged on the paper are concentrated on the tips of the conductive protrusions, and the paper is discharged to easily discharge to the facing conductive member.

〔Example〕

1 to 3, 1 is a shaft, 2 is a rotating shell,
3 is a bearing, 4 is a discharge electrode, 5 is an earth electrode, 7 is a conveyor belt, 9 is a printing paper, 10 is an impeller, 11 is a conveyor, 18 is an electric charge, and 20 is a neutralizing roller.

(Structure) The rotating shell 2 is supported by the shaft 3 which does not rotate by the bearing 3, and the conductive discharge electrode 4 is attached to the inner surface of the rotating shell 2 by a method such as screwing. The shaft 1 is connected to the earth pole 5.

(Action) The action of static elimination in the present invention will be described in comparison with the case where the discharge electrode 4 is not provided.

FIG. 2A shows the case where the discharge electrode 4 is not provided. At this time, the charge 18 of the paper 9 is transferred to the surface of the shell 2, but the shell 2 and the shaft 1
Since the distance d between and is usually several mm or more, the electric field strength does not rise and no discharge occurs.

Also, the bearing is insulated due to the lubricating oil,
Since there is no movement of the charge 18 through here, the charge remains in the shell 2. Therefore, the electric charge from the paper 9 one after another
18 cannot be transferred, and as a result, the paper 9 cannot be discharged. To discharge as it is, it is necessary to set the distance d between the shell 2 and the shaft 6 to about 1 mm or less as shown in (a).
Furthermore, it is necessary to carefully finish the inner surface of the shell 2 and the outer surface of the shaft 1.

In the embodiment of the present invention shown in FIG. 2 (c), the charges 18 transferred to the shell 2 are concentrated on the tips of the projections, and the electric field strength locally rises, for example, the distance between the discharge electrode 4 and the shaft 1. Even if D is a few mm, the electric charge 18 is easily discharged between the shaft 1 and the electric charge 18 is removed through the ground 5, so that the shell 2 can remove the electric charge 18 from the paper 9 one after another. The electricity is removed.

FIG. 3 shows an example in which the charge eliminating roller 20 according to the present invention is adopted in the conveying system to the above-mentioned impeller 10 of the printing press. Since the charged paper 9 is discharged on the discharging roller 20, the charged paper 9 can be smoothly inserted without being adsorbed on the impeller 10 and, as a result, the alignment on the conveyor 11 is improved, and troubles in the post process can be prevented. .

Further, the static elimination roller 20 according to the present invention does not require the high voltage power source required in the conventional device shown in FIG. 4, so that it is economical and the sliding contact required in the conventional device shown in FIG. Therefore, the initial performance can be maintained without maintenance even when used in a machine that performs high-speed continuous operation.

[Effect of device]

The following effects are produced by disposing a plurality of electrodes having needle-shaped tips on the inner surface of the roller that conveys the charged object with a small gap between the roller and the grounded shaft.

(1) No special high-voltage power supply is required to remove static electricity on the printing paper. Therefore, the equipment cost is low and the degree of safety is high.

(2) It is not necessary to install a sliding contact to ground the roller surface. Therefore, there is no performance deterioration due to wear, and the initial performance can be maintained.

[Brief description of drawings]

FIG. 1 is a structural view of an embodiment in which the present invention is applied to a guide roller, FIG. 1A is a sectional view taken along line AA of FIG. 1, and FIG.
Fig. 2 is an enlarged view of part B, Fig. 2 (a) (a) (c) is a sectional view of a roller for explaining the function of the present invention, and Fig. 3 shows an example of installation of the static eliminating roller of the present invention on a printing machine impeller. . FIG. 4 and FIG. 5 each show a conventional static eliminator, and FIGS. 6 (a) and 6 (b) are schematic views of the paper discharge section of the printing machine. 1 ... Shaft, 2 ... Rotating shell, 3 ... Bearing, 4 ... Discharge electrode, 5 ... Ground electrode, 7 ... Conveyor belt, 9 ... Printing paper, 18 ... Electric charge, 20 ... Static elimination roller

Claims (1)

[Scope of utility model registration request] 1. A charge-eliminating roller comprising a plurality of electrodes each having a needle-shaped tip and having a minute gap between the grounded shaft and the inner surface of the roller for conveying a charged object.