JP2579871B2 - Static elimination brush with grounding tool and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a neutralizing brush with a grounding tool and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, it is mounted on equipment such as a printer, a facsimile, a copier, a film manufacturing apparatus, a printing machine, etc. which handles paper and film, and reduces and eliminates static electricity charged on the surface of the paper and film. For this purpose, a self-discharge type static elimination brush is used. This type of static elimination brush generally has a structure in which a large number of brush materials made of conductive fibers or the like are held by a conductive holding member such as a metal plate. When this static elimination brush is attached to equipment, it is necessary to perform a grounding process to exert a static elimination function.

Heretofore, in order to perform earthing treatment on this kind of neutralizing brush, a method has been adopted in which a conductive holding member of the neutralizing brush is simply screwed to a metal portion of equipment to which the neutralizing brush is attached. However, in recent years, in OA equipment such as printers, facsimile machines, copiers, etc., in recent years, there has been an increase in structures in which each part of the equipment is almost surrounded by an insulator such as plastic. It is becoming impossible to perform a grounding process by a method of directly screwing to the main body of equipment.

[0004]

In view of such circumstances, the present inventors have previously proposed a static elimination brush with an earthing tool in which a grounding tool such as a conductive wire is attached to a holding member for arranging and fixing conductive brush materials. (Japanese Utility Model Laid-Open No. 3-124595).

[0005] In the above-described static elimination brush with an earthing tool, when a covered conductor is used as an earthing tool, the covering of the covered conductor is removed to expose a core wire, and the core wire portion is fixed to a holding member by a method such as adhesion or soldering. However, these methods have a problem that the mounting operation is complicated and the workability is inferior. For this reason, a method has been adopted in which the distal end portion of the coated conductive wire from which the coating has been removed is sandwiched and fixed to the holding member.

[0006] In recent years, OA equipment and the like have been further downsized, and a grounding tool for a static elimination brush is required to be soft and easy to handle. For this reason, it is necessary to use a coated conductor having a thinner core wire for this kind of earthing tool.

However, in the case of an earthing tool in which the core wire is made of a very thin covered conductor, the method of attaching and fixing the core wire portion exposed by removing the coating to the holding member is as follows.
There is a drawback that the grounding tool is easily removed, and therefore, there is a problem that a complicated operation such as fixing the grounding tool with an adhesive is required. In addition, there is also a problem that the core wire is easily cut because only the thin core wire portion is sandwiched and fixed to the holding member.

[0008] The present invention has been made in view of the above points,
Even when a coated conductor having a very thin core wire is used as a grounding tool, the grounding tool is securely and easily fixed, and a grounding brush with a grounding tool that does not cause problems such as falling off of the grounding tool or cutting of the grounding tool is provided. It is an object of the present invention to provide a manufacturing method thereof.

[0009]

In other words, a static elimination brush with an earthing tool according to the present invention comprises a holding member for arranging and fixing a plurality of conductive brush materials, a coated conductive wire having a core wire exposed by removing a coating material at a tip portion. The grounding tool is fixed by sandwiching the grounding tool from the exposed core wire to the covering portion.

In the static elimination brush of the present invention, it is preferable that the tip of the grounding tool held by the holding member is partially held and fixed by applying different pressures, and in particular, the exposed core wire of the tip of the grounding tool. It is preferable that the clamping pressure of the portion is higher than that of the covering portion. Further, a small hole may be provided in a portion of the holding member where the grounding tool is clamped, and a part of the covering member at the tip of the clamped grounding tool may be fitted into the small hole.

[0011] Further, according to the method of manufacturing a static elimination brush with an earthing tool of the present invention, the holding member is provided with a plurality of conductive brush materials.
A grounding tool made of a coated conductor whose core wire has been exposed by removing the coating material at the tip is sandwiched from the core wire exposed at the tip of the grounding tool to the coating, and then the entire holding member is pressed to brush the brush. It is characterized in that the material and the earthing tool are clamped and fixed to the holding member.

In the method of the present invention, it is preferable to press the front end portion of the grounding member held by the holding member so that different pressures are partially applied to the grounding member so as to hold and fix the grounding tool to the holding member. It is preferable to press and hold the holding member so as to apply a higher pressure to the exposed core wire portion of the tip of the grounding tool than the covering portion. At this time, a pressure equal to or higher than that of the portion holding the conductive brush material is applied to the core wire portion. Also, a small hole is provided at a position where the grounding tool of the holding member is clamped, and the grounding tool is sandwiched between the holding member so that the covering portion of the tip of the grounding tool is located at the position of the small hole, and then the holding member is pressed. It is preferable to hold and fix the grounding tool.

[0013]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a static elimination brush 1 with a grounding tool according to the present invention.
It is a principal part perspective view which shows one Example. In the figure, 2 is a conductive brush material, 3 is a holding member for arranging and fixing a plurality of conductive brush materials 2, 4 is a grounding tool, and 5 is a terminal provided at the tip of the grounding tool 4.

As the conductive brush material 2, conductive fibers and the like conventionally used for this type of static elimination brush can be used. Further, the holding member 3 may be any as long as the conductive brush material 2 can be arranged and fixed, and the grounding tool 4 can be clamped and fixed, and electrical conduction between the conductive brush material 2 and the grounding tool 4 can be achieved. Usually, it is preferable to use a metal plate such as an aluminum plate. It is preferable that the holding member 3 be folded in two as shown in the figure so that the conductive brush material 2 is clamped and fixed together with the grounding tool 4 because the manufacture of the brush becomes extremely simple.

As the grounding member 4, a general coated conductor having a structure in which a core wire 6 in which a plurality of fine copper wires are twisted and covered with a coating material 7 can be used. As the covered conductor, a core wire having a thickness of about 0.75 mm ² or less is usually used. The thickness and length of the grounding member 4 are appropriately set according to the application. Particularly, when flexibility is required in order to facilitate the handling of the grounding member 4, the thickness of the core wire 6 is reduced to zero. .3Mm ² about the following ones are used. For example, the present invention is particularly effective when a static elimination brush is attached so as to move up and down in accordance with the operation of the device, and the ground terminal is fixed to an immovable portion.

In the static eliminator 1 of the present invention, the earthing member 4 from which the core wire 6 is exposed by removing the coating material at the tip of the insulated wire is used to cover the vicinity of the tip from the exposed core wire 6a at the tip of the earthing member 4. It is attached and fixed by the holding member 3 to the portion 7a. Therefore, the thickness of the core wire 6 is 0.3 mm ²
Even when a thin covered wire having a thickness equal to or less than that is used, the mounting state of the grounding tool 4 can be securely fixed without becoming unstable.

In the static elimination brush 1 of the present invention, the earthing tool 4 may be held with a uniform holding pressure, or may be held with a locally different pressure. In particular, grounding tool 4
Is held by the holding member 3 so as to extend to the covering portion 7a at the tip of the grounding tool 4, so that poor contact between the exposed core wire 6a at the tip of the grounding tool 4 and the holding member 3 is prevented. In order to obtain reliable electrical contact with the holding member 3, at least the core wire 6a at the tip of the grounding tool 4 is covered with the covering portion 7a.
It is preferable that the clamping is performed at a pressure higher than the clamping pressure of the portion.

In the static elimination brush 1 of the present invention, a small hole 8 is provided in a portion of the holding member 3 where the grounding tool 4 is held.
As shown in FIG. 2, when a part of the covering member of the covering portion 7a at the tip end of the grounding tool 4 is fitted into the inside of the small hole 8 as shown in FIG. This is preferable because the tool 4 is more firmly fixed.

In order to manufacture the neutralizing brush 1 of the present invention, first, as shown in FIG. 3, the conductive brush 2 and the earthing tool 4 are sandwiched between the holding members 3 obtained by folding an aluminum plate or the like into two. At this time, the holding member 3 has two component pieces 3a,
The conductive brush material 2 is temporarily fixed to the inner surface of one of the holding member constituting pieces 3a by, for example, an adhesive tape 9 or the like, with the state of opening 3b (V-shaped to L-shaped cross section). The grounding tool 4 may be located on the conductive brush material 2.

When the holding member 3 having the small holes 8 is used when sandwiching the grounding tool 4 to a predetermined position, the covering portion 7a of the tip of the grounding tool 4 is positioned at the position of the small hole 8. Insert. Next, the entire holding member 3 is pressed to clamp and fix the conductive brush 2 and the earthing member 4. It is preferable that the earthing member 4 is temporarily fixed to the holding member 3 before the holding member 3 is pressed.

The temporary fixing of the grounding member 4 is performed by, for example, the grounding member 4.
This is performed by locally caulking the core wire 6a exposed at the tip. At this time, the small hole 8 is provided in the holding member 3 as described above, and the grounding tool 4 is inserted into the position of the small hole 8 until the covering portion 7a at the tip of the grounding tool 4 is positioned. It is easy to confirm the crimping position when temporarily fixing the holding member 4, and when the entire holding member 3 is pressed, the covering portion 7 a at the tip of the grounding tool 4 is inserted into the small hole 8.
Part of the member is fitted, and the earthing tool 4 can be securely fixed.

In the step of pressing the entire holding member 3, the holding member 3 may be pressed so as to apply a uniform clamping pressure, but the mounting of the earthing member 4 and the exposing of the holding member 3 and the tip of the earthing member 4 may be performed. In order to make the electrical contact with the core wire 6a more secure and to prevent the wire material of the grounding tool 4 from being cut by the press pressure even if the core wire is a thin covered conductor, the tip of the grounding tool 4 must be held. It is preferable to press so as to apply a smaller clamping pressure to the vicinity of the covering portion 7a clamped by the member 3 than to the other portion (accordingly, press the portion other than the vicinity of the covering portion 7a to apply a higher clamping pressure). . Alternatively, the exposed core wire 6a at the tip of the grounding tool 4 may be pressed so that a particularly stronger clamping pressure is applied than the other portions.

In order to clamp the parts locally at different pressures, for example, a mold having a locally convex part is used as the upper die of the press type, and only the core exposed at the tip of the grounding tool is strongly clamped by the convex part. Can be done. The projection may be configured to be slidable in the pressing direction by a spring material or the like. Further, a concave portion may be formed in the upper mold or the lower mold so as to be clamped by a weak pressure.

In any of the above-mentioned press methods, if necessary, after the press is completed, a local re-press may be applied in the vicinity of the portion for the purpose of holding and fixing the core wire 6a more strongly. The method of pressing so that a smaller clamping pressure is applied to the vicinity of the covering portion 7a clamped by the holding member 3 at the tip of the grounding tool 4 than the other portion can securely clamp and fix the grounding tool 4 in one step. It is particularly preferable to prevent poor contact of the grounding tool 4.

Next, the present invention will be described in more detail with reference to specific examples.

Example 1 The thickness of a core wire having a length of 5 mm from the tip and having a coating removed is 0.2 mm.
^{2 Using} a covered conductor (1.4 mm in thickness including the covering material) as a grounding tool, the entire length of the holding member is clamped so that the length of 10 mm from the end is clamped by a holding member consisting of a 0.5 mm thick aluminum plate. Was uniformly pressed (50 kg / cm ² ) to produce a neutralization brush. With respect to this static elimination brush, the pulling strength contact failure rate of the earthing tool was measured. Table 1 shows the measurement results.

Example 2 Using an upper die having a convex portion having a step of 0.15 mm, only the core wire exposed at the tip of the grounding tool was clamped stronger than the whole, and the same as in Example 1 was performed. A static elimination brush was manufactured. With respect to this static elimination brush, the pull-out strength and contact failure rate of the grounding tool were measured, and the measurement results are shown in Table 1.

Example 3 As in Example 1, the upper mold having a recess having a step of 0.15 mm was used, and the vicinity of the covering portion of the earthing tool held by the holding member was held weaker than the whole. Then, a neutralization brush was manufactured. With respect to this static elimination brush, the pull-out strength and contact failure rate of the earthing tool were measured, and the measurement results were shown in Table 1.
Shown in

Example 4 A static elimination brush was manufactured in the same manner as in Example 1 by using a holding member provided with a small hole having a diameter of 2 mm, and positioning the covering portion at the tip of the earthing tool in the small hole. With respect to this static elimination brush, the pull-out strength and contact failure rate of the grounding tool were measured, and the measurement results are shown in Table 1.

COMPARATIVE EXAMPLE 1 The same procedure as in Example 1 was performed, except that the covering of 10 mm was removed from the end of the coated conductor used in Example 1 to form a grounding tool, and only the core wire exposed at the end was held by the holding member. Then, a neutralization brush was manufactured. With respect to this static elimination brush, the pull-out strength and contact failure rate of the grounding tool were measured, and the measurement results are shown in Table 1.

In the examples and comparative examples, the pull-out strength of the grounding tool was measured by a tension gauge, and the contact failure rate was determined by:
The continuity between the holding member and the other end (terminal) of the grounding tool was measured with a multimeter.

[0033]

[Table 1]

[0034]

As described above, in the static eliminator with the earthing tool according to the present invention, the earthing tool consisting of the coated conductor whose core is exposed by removing the coating material at the tip is exposed at the tip of the earthing tool. Since the core wire is clamped and fixed to the holding member from the core wire to the covering portion near the tip, even a grounding tool made of a coated conductor with a thin core wire can be securely fixed, and the core wire can be cut. There is no danger. As a result, it is possible to use a thin covered conductive wire which is flexible and has excellent maneuverability as a grounding tool, and the static elimination brush of the present invention can be easily attached to miniaturized equipment.

When the clamping pressure of the grounding tool is locally varied, and especially when a high clamping pressure is applied to the exposed core wire portion of the grounding tool, especially the covering portion of the tip of the grounding tool clamped by the holding member. When the grounding fixture is clamped and fixed so that the clamping pressure applied to the other parts including the exposed core wire at the tip of the grounding fixture becomes higher than the clamping pressure applied to A cutting accident can be prevented, and the occurrence of poor contact of the grounding tool can be prevented.

Further, a small hole is provided in a portion of the holding member where the grounding member is clamped, and a part of the covering member at the tip of the clamped grounding member is fitted into the small hole to clamp and fix the grounding member. , The earthing tool is more firmly fixed.

Further, according to the manufacturing method of the present invention, the above-described static elimination brush can be reliably manufactured. In addition, if a small hole is provided in the holding member, this small hole serves as a guide for the insertion position when inserting the grounding tool into the holding tool, and the grounding tool is positioned so that the covering portion of the tip of the grounding tool is located at the position of the small hole. By holding the grounding tool in the holding member, the temporary fixing position of the grounding tool can be easily checked, and when the grounding tool is held and fixed by the holding member, part of the covering It can be fixed securely.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part showing an example of a static elimination brush with a grounding tool of the present invention.

FIG. 2 is a longitudinal sectional view taken along the line II-II in FIG.

FIG. 3 is a perspective view showing one step in manufacturing the static elimination brush of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 static elimination brush with grounding tool 2 conductive brush material 3 holding member 4 grounding tool 6 core wire 6a core wire 7 coating material 7a coating part 8 small hole

Claims (5)

(57) [Claims] 1. A grounding member made of a coated conductive wire having a core wire exposed by removing a coating material at a tip end of a holding member for arranging and fixing a plurality of conductive brush materials, and a tip end portion of the grounding tool is exposed. A static elimination brush with a grounding member, which is fixed by sandwiching from a core wire to a covering portion. 2. The static elimination brush with an earthing tool according to claim 1, wherein the tip of the earthing tool held by the holding member is partially held and fixed by applying different pressures. 3. A small hole is provided in a portion of the holding member where the grounding tool is clamped, and a part of the covering member at the tip of the clamped grounding tool is fitted into the small hole. The static elimination brush with a grounding tool according to claim 1 or 2. 4. A grounding tool comprising a plurality of conductive brush materials on a holding member and a coated lead having a core wire exposed by removing a coating material at a tip portion from a core wire exposed at a tip portion of the grounding tool. A method for manufacturing a static elimination brush with an earthing tool, wherein the brush member and the earthing tool are sandwiched and fixed to the holding member by pressing the entire holding member, and then pressing the entire holding member. 5. The earthing device according to claim 4, wherein the holding member is pressed so that different pressures are partially applied to the tip of the earthing device held by the holding member, and the earthing device is held and fixed. For manufacturing a static elimination brush with a tool.