JP6876977B2 - Static eliminator - Google Patents

Description

The present invention relates to a static eliminator.

Conventionally, a device such as a printer or a copier that requires static electricity removal is provided with a static electricity removing brush for removing static electricity. For example, Patent Document 1 discloses a static elimination brush including a plurality of conductive fibrous electrodes.

Japanese Unexamined Patent Publication No. 2011-143168

When the static elimination brush comes into contact with an object for static elimination such as paper, the adjacent fibrous electrodes come into contact with each other and wear.

Therefore, an object of the present invention is to provide a static eliminator having excellent wear resistance.

In order to achieve the above object, the static eliminator according to one aspect of the present invention includes a plurality of metal wires having a wire diameter of 20 μm or less, and each of the plurality of metal wires is tungsten or an alloy of rhenium and tungsten. Consists of.

According to the present invention, it is possible to provide a static eliminator having excellent wear resistance.

It is a front view of the static elimination brush which concerns on embodiment. It is sectional drawing of the static elimination brush which concerns on embodiment in line II-II of FIG. It is a perspective view of the stranded wire provided in the static elimination brush which concerns on embodiment. It is a figure which shows the characteristic of the static elimination brush which concerns on embodiment. It is a transition diagram which shows the manufacturing method of the metal wire which comprises the stranded wire of the static elimination brush which concerns on embodiment. It is a transition diagram which shows the manufacturing method of the static elimination brush which concerns on embodiment.

Hereinafter, the static eliminator according to the embodiment of the present invention will be described in detail with reference to the drawings. It should be noted that all of the embodiments described below show a specific example of the present invention. Therefore, the numerical values, shapes, materials, components, arrangement and connection forms of the components, steps, the order of steps, etc. shown in the following embodiments are examples, and are not intended to limit the present invention. Therefore, among the components in the following embodiments, the components not described in the independent claims indicating the highest level concept of the present invention will be described as arbitrary components.

Further, each figure is a schematic view and is not necessarily exactly illustrated. Therefore, for example, the scales and the like do not always match in each figure. Further, in each figure, substantially the same configuration is designated by the same reference numerals, and duplicate description will be omitted or simplified.

[Static elimination brush (static elimination body)]
First, the outline of the static elimination brush according to the present embodiment will be described with reference to FIGS. 1 to 3. 1 and 2 are front views of the static elimination brush 1 according to the present embodiment, respectively. FIG. 2 shows a cross section taken along line II-II shown in FIG. FIG. 3 is a perspective view of the stranded wire 10 according to the present embodiment.

The static eliminator brush 1 is an example of a static eliminator that removes static electricity. As shown in FIGS. 1 and 2, the static elimination brush 1 includes a plurality of stranded wires 10 and a support portion 20 that supports the plurality of stranded wires 10.

The plurality of stranded wires 10 are brush portions of the static elimination brush 1, and when they come into contact with the object, the electrostatic charge charged on the object is removed from the object. As shown in FIG. 3, each of the plurality of stranded wires 10 is formed by twisting a plurality of metal wires 100 by n wires. Here, n is a natural number of 2 or more. FIG. 3 shows the case where n = 6, that is, the stranded wire 10 in which six metal wires 100 are twisted.

In this embodiment, the configurations of the plurality of stranded wires 10 are the same as each other. The twisted wire 10 is, for example, a twisted yarn formed by subjecting n metal wires 100 to a twisting process. The stranded wire 10 may be a covering yarn formed by subjecting n metal wires 100 to a covering process. The pitch P of the stranded wire 10 shown in FIG. 3 is, for example, 5 mm, but is not limited to this.

The configurations of the plurality of stranded wires 10 may be different from each other. For example, n, which is the number of metal wires 100 used for twisting, may be different for each stranded wire 10. For example, the static elimination brush 1 may include a stranded wire 10 in which three metal wires 100 are twisted and a stranded wire 10 in which seven metal wires 100 are twisted. Further, the twisting method may be different for each stranded wire 10. For example, the static elimination brush 1 may include a stranded wire 10 which has been covered and a stranded wire 10 which has been combined and twisted.

Each of the plurality of metal wires 100 constituting the stranded wire 10 is made of tungsten (W). Details will be described later.

The support portion 20 is a member that sandwiches and fixes a plurality of stranded wires 10, and includes a support 21 and a frame body 22 that houses the support 21 inside. The plurality of stranded wires 10 are arranged so as to be wound around the support 21, and are sandwiched and fixed between the support 21 and the frame 22. Details will be described later with reference to FIG.

The support 21 is a metal elongated plate. The support 21 is formed of, for example, aluminum, stainless steel, or the like. A plurality of stranded wires 10 are arranged side by side along the longitudinal direction of the support 21.

As shown in FIG. 2, the frame body 22 is an elongated member made of metal having a substantially C-shaped cross section. A plurality of stranded wires 10 are provided so as to extend outward from a substantially C-shaped opening portion of the frame body 22. The frame body 22 is, for example, an extruded aluminum material, but is not limited to this. The frame body 22 may be formed by bending an elongated sheet metal.

The support 21 and the frame 22 are electrically connected to the plurality of stranded wires 10. At least one of the support 21 and the frame 22 is grounded, and the electrostatic charge removed by the plurality of stranded wires 10 can be released.

The configuration of the static elimination brush 1 is not limited to the configuration shown in FIGS. 1 and 2. For example, a plurality of stranded wires 10 may be fixed to the support 21 by an adhesive sheet or the like.

The static eliminator brush 1 according to the present embodiment is, for example, an OA device such as a printer, a copier, a facsimile, an ATM (Automatic Teller Machine), a ticket issuing machine, an optical disk drive, a plastic film manufacturing machine, or the like that requires static electricity removal. It is installed in. Alternatively, the static eliminator brush 1 can be held and used by the user, and may be used, for example, as a hand brush for removing static electricity from clothes.

Since the static elimination brush 1 includes a metal wire 100 made of tungsten, it has excellent wear resistance. Hereinafter, the details of the metal wire 100 will be described.

[Metal wire]
The metal wire 100 is a tungsten wire made of tungsten. The metal wire 100 is made of pure tungsten having a purity of 99.9% or more. The purity of the tungsten constituting the metal wire 100 may be, for example, 95% or more. Since tungsten has a high Mohs hardness, even if the metal wires 100 made of tungsten rub against each other, they are not easily scratched by each other. Therefore, the metal wire 100 has excellent wear resistance.

The wire diameter of the metal wire 100 is 20 μm or less. Since the wire diameter of the metal wire 100 is sufficiently small, the flexibility of the metal wire 100 is increased and it becomes easy to bend. This facilitates the twisting process of the metal wire 100. The wire diameter of the metal wire 100 may be, for example, 15 μm or less, or 10 μm or less. The cross-sectional shape of the metal wire 100 in the extending direction is circular, but may be rectangular or elliptical such as a square.

The strength of the metal wire 100 made of tungsten becomes stronger as the wire diameter becomes smaller. Therefore, since the occurrence of wire breakage of the metal wire 100 can be suppressed, the occurrence of detachment from the support portion 20 can be suppressed. Thereby, the deterioration of the static elimination performance of the static elimination brush 1 can be suppressed.

The surface roughness Ra of the metal wire 100 is, for example, 0.10 μm or less. As a result, even when the metal wires 100 rub against each other, they are less likely to be scratched. The same applies to the case where the stranded wire 10 is formed by twisting the plurality of metal wires 100. Therefore, the wear resistance of the static elimination brush 1 can be further improved.

In the present embodiment, the stranded wire 10 shown in FIG. 3 is formed by twisting the plurality of metal wires 100. The configurations of the plurality of metal wires 100 constituting the stranded wire 10 may be different from each other. For example, the wire diameter or surface roughness of the metal wire 100 may be different for each metal wire 100.

[Characteristics of static elimination brush]
Here, the characteristics of the static elimination brush 1 according to the present embodiment will be described with reference to FIG. FIG. 4 is a diagram showing the characteristics of the static elimination brush 1 according to the present embodiment. In FIG. 4, for each wire diameter of the metal wire 100, the damage property of the static elimination brush 1 to the object, the dust removal property (that is, the brush property), the wear resistance, and the static elimination property are shown. "○" indicates that the performance is excellent, and "x" indicates that the performance is not preferable.

As shown in FIG. 4, the static elimination brush 1 has excellent wear resistance and static elimination properties regardless of the wire diameter of the metal wire 100. This is because the metal wire 100 is formed by using tungsten having a high Mohs hardness and excellent conductivity.

The metal wire 100 removes the electrostatic charge charged on the object by coming into contact with the object. Therefore, when the metal wire 100 is hard, there is a risk of damaging the object such as scratches. The object is paper, an optical disk, a plastic film, or the like.

On the other hand, as shown in FIG. 4, when the wire diameter is 20 μm or less, the damage to the object is small. When the wire diameter is 20 μm or less, the flexibility of the metal wire 100 is enhanced, so that the metal wire 100 easily moves smoothly and slips easily with respect to an object. Therefore, the metal wire 100 is less likely to be caught on the object, and damage such as scratches is suppressed.

On the other hand, when the wire diameter is 25 μm or more, the flexibility of the metal wire 100 is worse than when the wire diameter is 20 μm or less, so that the metal wire 100 is more likely to be caught and the damage is increased.

Further, the brush performance of the static elimination brush 1, that is, the dust removability, allows dust to be appropriately removed when the wire diameter is 25 μm or less. On the other hand, when the wire diameter is 30 μm or more, the movement of the metal wire 100 becomes slow and the brush performance is slightly deteriorated.

The static elimination brush 1 according to the present embodiment includes a stranded wire 10 in which a plurality of metal wires 100 are twisted. The wire diameter of the stranded wire 10 is at least twice the wire diameter of the metal wire 100, and is, for example, 50 μm. Since the static elimination brush 1 is provided with the stranded wire 10, the surface area of the stranded wire 10 is larger than that of the case where the stranded wire 10 is provided with a single wire having the same diameter as the stranded wire 10, so that the static elimination property is improved. Further, by increasing the pitch of the stranded wires 10, each of the plurality of metal wires 100 becomes easy to move, the damage given to the object is reduced, and the dust removability is improved.

[Manufacturing method of static elimination brush]
Hereinafter, a method for manufacturing the static elimination brush 1 will be described. The method for manufacturing the static elimination brush 1 includes a step of manufacturing a thin metal wire 100 and a step of manufacturing a static elimination brush 1 using a plurality of metal wires 100.

In the following, first, a step of manufacturing the metal wire 100 will be described with reference to FIG. FIG. 5 is a transition diagram showing a method for manufacturing the metal wire 100 according to the present embodiment.

First, as shown in FIG. 5A, the tungsten powder 101 is prepared. The average particle size of the tungsten powder 101 is, for example, 5 μm, but is not limited to this.

Next, an ingot made of tungsten is produced by pressing and sintering (sintering) the tungsten powder 101. As shown in FIG. 5 (b), a wire-shaped tungsten wire 102 is produced by forging, compressing, and stretching the ingot from the surroundings. For example, the tungsten ingot which is a sintered body has a wire diameter of about 15 mm, whereas the wire-shaped tungsten wire 102 has a wire diameter of about 3 mm.

Next, as shown in FIG. 5 (c), a wire drawing process is performed using a wire drawing die.

Specifically, first, as shown in FIG. 5 (c1), the tungsten wire 102 is annealed. Specifically, not only the tungsten wire 102 is directly heated by the burner, but also the tungsten wire 102 is heated while passing an electric current. The annealing step is performed to remove the processing strain caused by the aging process or the drawing process.

Next, as shown in FIG. 5 (c2), the drawing die 30 is used to draw the tungsten wire 102, that is, to draw the tungsten wire 102. Since the tungsten wire 102 is heated and softened by the annealing step in the previous stage, the wire can be easily drawn. By thinning the tungsten wire 102, its tensile strength is increased. That is, the tungsten wire 103 thinned by the drawing step has a higher tensile strength than the tungsten wire 102. The wire diameter of the tungsten wire 103 is, for example, 0.6 mm, but is not limited to this.

Next, as shown in (c3) of FIG. 5, the dice are exchanged. Specifically, as the die used for the next drawing process, the drawing die 31 having a diameter smaller than that of the drawing die 30 is selected. The wire drawing dies 30 and 31 are diamond dies made of, for example, sintered diamond or single crystal diamond.

(C1) to (c3) of FIG. 5 are repeated until the wire diameter of the tungsten wire 103 becomes a desired wire diameter (specifically, 20 μm or less). At this time, in the drawing step shown in FIG. 5 (c2), the shape and hardness of the drawing die 30 or 31, the lubricant used, and the temperature of the tungsten wire are determined according to the wire diameter of the target tungsten wire. It is done by adjusting such things.

Similarly, in the annealing step shown in FIG. 5 (c1), the annealing conditions are adjusted according to the wire diameter of the target tungsten wire. Specifically, the larger the wire diameter of the tungsten wire, the higher the temperature, and the smaller the diameter of the tungsten wire, the lower the temperature. For example, when the wire diameter of the tungsten wire is large, specifically, in the annealing step at the time of the first wire drawing process, annealing is performed at a temperature of 1400 ° C. to 1800 ° C. In the final annealing step at the time of the final wire drawing process to obtain a desired wire diameter, heating is performed at a temperature of 1200 ° C. to 1500 ° C. In the final annealing step, it is not necessary to energize the tungsten wire.

Further, the annealing step may be omitted when the drawing process is repeated. For example, the final annealing step may be omitted. Specifically, the final annealing step may be omitted, and the shape and hardness of the lubricant and the wire drawing die may be adjusted.

Finally, as shown in FIG. 5D, the surface of the tungsten wire 104 is smoothed by performing electrolytic polishing on the tungsten wire 104 having a desired wire diameter. As shown in FIG. 5D, the electrolytic polishing step involves immersing the tungsten wire 104 and the counter electrode 41 such as a carbon rod in an electrolytic solution 40 such as an aqueous sodium hydroxide solution, and then using the tungsten wire 104. This is done by energizing between the counter electrode 41 and the counter electrode 41.

Through the above steps, the metal wire 100 is manufactured as shown in FIG. 5 (e).

Subsequently, a method of manufacturing the static elimination brush 1 using the manufactured metal wire 100 will be described with reference to FIG. FIG. 6 is a transition diagram showing a method of manufacturing the static elimination brush 1 according to the present embodiment.

First, as shown in FIG. 6A, one long stranded wire 11 is manufactured by twisting a plurality of metal wires 100. For example, the stranded wire 11 is manufactured by subjecting six metal wires 100 to a combined twisting process. The length of the stranded wire 11 is, for example, longer than the total value of the lengths of the plurality of stranded wires 10 included in the static elimination brush 1.

Next, as shown in FIG. 6B, the stranded wire 11 is wound around the support 21. At this time, the stranded wire 11 is wound so that a sufficient length protrudes only on one side of the support 21 in the lateral direction. The amount of protrusion is larger than the length of the stranded wire 10 of the static elimination brush 1. The winding interval is equal, for example, 1 mm or less, but is not particularly limited.

Next, as shown in FIG. 6C, the frame body 22 is attached with the stranded wire 11 wound around the stranded wire 11. Specifically, the support 21 and the stranded wire 11 are sandwiched and fixed by the frame body 22.

Next, as shown in FIG. 6D, the cutting device 50 cuts the end of the protruding portion of the stranded wire 11. As a result, the static elimination brush 1 shown in FIG. 1 is manufactured.

Note that FIGS. 5 and 6 schematically show each step of the manufacturing method of the metal wire 100 and the static elimination brush 1, respectively. Each step may be performed individually, or each step may be performed in-line. For example, the plurality of wire drawing dies are arranged in order of decreasing diameter on the production line, and a heating device or the like that performs an annealing step may be arranged between the wire drawing dies. Further, the electrolytic polishing device may be arranged after the wire drawing die having the smallest diameter.

[Effects, etc.]
As described above, the static elimination brush 1 according to the present embodiment includes a plurality of metal wires 100 having a wire diameter of 20 μm or less. Each of the plurality of metal wires 100 is made of tungsten.

As a result, since the metal wire 100 is made of tungsten having a high Mohs hardness, even if the metal wires 100 rub against each other, they are less likely to be scratched by each other. Therefore, it is possible to provide the static elimination brush 1 having excellent wear resistance.

Further, for example, the plurality of metal wires 100 are twisted by n (n is a natural number of 2 or more).

As a result, the surface area of the stranded wire 10 is larger than that of the case where a single wire having the same diameter as the stranded wire 10 is provided, so that the static elimination property is improved. Further, by increasing the pitch of the stranded wires 10, each of the plurality of metal wires 100 becomes easy to move, the damage given to the object is reduced, and the dust removability is improved. Further, since the plurality of metal wires 100 are twisted, they are unlikely to be separated from each other, and the detachment of the metal wires 100 can be suppressed. Therefore, the deterioration of the static elimination performance of the static elimination brush 1 can be suppressed, and the life of the static elimination brush 1 can be extended. Therefore, it is possible to reduce the number of maintenances of the device on which the static elimination brush 1 is mounted.

(Modification example)
Hereinafter, a modified example of the static elimination brush according to the embodiment will be described with reference to the drawings.

For example, in the above embodiment, an example in which the metal wire 100 is made of pure tungsten has been shown, but the present invention is not limited to this. The metal wire 100 may be composed of an alloy (ReW) of rhenium (Re) and tungsten.

Specifically, the metal wire 100 may contain tungsten as a main component and may contain rhenium in a predetermined ratio. The rhenium content of the metal wire 100 is, for example, 0.1 wt% or more and 10 wt% or less. Specifically, the content of rhenium is 3 wt%, but it may be 1 wt%.

Since the metal wire 100 contains rhenium, the strength can be increased as compared with the pure tungsten wire. For example, the tensile strength of the ReW wire is 3500 MPa or more and 5000 MPa or less.

As a result, the wear resistance of the static elimination brush including the metal wire 100 made of an alloy of rhenium and tungsten can be improved.

Further, for example, the metal wire 100 includes a metal wire made of tungsten doped with potassium (K) (hereinafter, referred to as a potassium-doped tungsten wire) instead of the metal wire 100 made of pure tungsten or a ReW alloy. May be good.

The potassium-doped tungsten wire contains tungsten as a main component and contains potassium in a predetermined ratio. The potassium content of the potassium-doped tungsten wire is 0.005 wt% or more and 0.010 wt% or less.

The smaller the diameter of the potassium-doped tungsten wire, the stronger the strength. The tensile strength, elastic modulus, wire diameter, etc. of the potassium-doped tungsten wire are the same as those of the metal wire 100 made of ReW alloy.

As a result, the tungsten contains a trace amount of potassium, so that the radial crystal grain growth of the potassium-doped tungsten wire is suppressed. Therefore, the static elimination brush provided with the potassium-doped tungsten wire has higher strength at high temperature than that of pure tungsten. Therefore, even when used at a high temperature, the excellent wear resistance of the static elimination brush can be exhibited.

(Other)
Although the static elimination body according to the present invention has been described above based on the above-described embodiment, the present invention is not limited to the above-described embodiment.

For example, in the above embodiment, as an example of a static eliminator including a plurality of metal wires 100, a static eliminator brush 1 in which a plurality of stranded wires 10 produced by twisting the plurality of metal wires 100 are formed in a brush shape is used. I explained, but it is not limited to this. For example, in the static elimination brush 1, the plurality of metal wires 100 may be fixed to the support 21 as they are without being twisted.

Further, the static eliminator may be, for example, a static eliminator sheet obtained by molding a plurality of metal wires 100 into a sheet shape. The static elimination sheet is formed, for example, by a weaving process or a knitting process using a plurality of metal wires 100. For example, the static elimination sheet may be a metal mesh formed by using a plurality of metal wires 100. Alternatively, the static elimination sheet may be a non-woven fabric using a plurality of metal wires 100. Further, for example, the static eliminator may be a plurality of metal wires 100 processed into a lump, such as a scrubbing brush.

In addition, it is realized by arbitrarily combining the components and functions in each embodiment within the range obtained by applying various modifications to each embodiment and the gist of the present invention. Forms are also included in the present invention.

1 Static elimination brush (static elimination body)
10, 11 stranded wire 100 metal wire

Claims (3)

Multiple metal wires with a wire diameter of 20 μm or less and
A support portion for supporting the plurality of metal wires is provided.
Each of the plurality of metal lines, data tungsten, or Ri alloy Tona of rhenium and tungsten,
The support portion
With the support
The support is housed inside, and includes a frame having an opening.
The plurality of metal wires are wound around the support so that both ends thereof protrude from the opening, and the static eliminator is fixed between the support and the frame. The static elimination body according to claim 1, wherein the plurality of metal wires are twisted by n (n is a natural number of 2 or more). Each of the plurality of metal wires consists of potassium-doped tungsten.
The static elimination body according to claim 1 or 2.

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