JP2003088424A - Method of manufacturing rotary brush, rotary tooth- brush and toothbrush - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a rotary brush which is capable of efficiently forming high-density bristles, a rotary brush and a toothbrush using the same. SOLUTION: A fiber tuft 1 consisting of a multiplicity of short fibers is formed by cutting long-sized fibers to a short-fiber form and one end side in the longitudinal direction of the fiber tuft 1 is fixed to a fixture 2 and a free end 1a side of the fiber tuft 1 is radially diametrally expanded by moving a diametral expanding tool 3 capable of diametrally expanding the fiber tuft 1 from the approximate central position of the fiber tuft 1 from the free end 1a which is the other end side of the fiber tuft 1 toward the periphery, by which the fiber tuft is formed to a flat planar form and the one end side of the fixed fiber tuft 1 is melted and integrated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a rotary brush and a rotary brush, and more specifically, to a method of manufacturing a rotary brush that can be used for toothbrushes, etc., a rotary brush manufactured by this manufacturing method, and this rotary brush. Toothbrush using.

[0002]

2. Description of the Related Art As a toothbrush that effectively removes plaque attached to a tooth and massages gums, a toothbrush (brush) having a rotatable tip has been developed for a long time. For example, it is a toothbrush in which a rotating brush is attached to one end side of the handle of the toothbrush (actually developed 59-4).
1125). In this type of toothbrush, a rotor in which bristles are planted is rotatably supported at the tip of the handle opposite to the handle, so that the rotor can rotate in the tooth row direction. That is, the rotor is configured by arranging a large number of bristles on the outer peripheral surface of the cylindrical rotor, and the support shaft is passed through the center of the rotor, and is rotatable about the support shaft. Then, by attaching such a rotor, it is intended to make the toothbrushing operation effective.

[0003]

However, it is not easy to implant a large number of bristles on the outer peripheral surface of the core of the rotor.
It could not always be manufactured with high productivity. Moreover, the number of hairs to be planted is limited, and it has been difficult to efficiently plant hairs at high density.

In view of the above-mentioned problems of the prior art, an object of the present invention is to provide a method of manufacturing a rotary brush capable of efficiently forming a high-density brush, a rotary brush, and a toothbrush using the same. It is in.

[0005]

The above objects can be achieved by the inventions described in the claims. That is, the characteristic configuration of the method for manufacturing a rotary brush according to the present invention is that a long fiber is cut into short fibers to form a fiber bundle composed of a large number of short fibers, and one end side in the length direction of this fiber bundle is formed. The fiber bundle is fixed to a fixing jig, and a diameter-expanding jig capable of expanding the diameter of the fiber bundle is moved from the free end, which is the other end side of the fiber bundle, toward the periphery from a substantially central position of the fiber bundle. Is formed into a flat plate shape so that the free end side of the fiber bundle is radially expanded, and one end side of the fixed fiber bundle is integrated.

According to this structure, the bundle of fibers is mechanically formed instead of performing the work of implanting a large number of bristles, so that a high-density brush can be formed efficiently. Moreover, the brush density of the molded rotary brush can be made sufficiently high by increasing the number of short fibers constituting the fiber bundle.

It is preferable that one end of the fiber bundle is integrated by fusion, at the center of the fixed end of the fiber bundle is bored, and a shaft is axially supported through a hole through the bored hole.

According to this structure, one end side of the fiber bundle can be firmly integrated and the toothbrush can be easily manufactured by mounting the shaft supported on the handle of the toothbrush, for example. Moreover, by stacking a plurality of rotary brushes, it is possible to manufacture rotary brushes having various brush widths according to the purpose of use, which is convenient for a wide range of applications.

It is preferable that the free end side of the fiber bundle is radially expanded and then the free end side of the fiber bundle is cut in a diameter reducing direction so as to have a predetermined length.

According to this structure, it is possible to manufacture rotary brushes having various brush lengths according to the purpose of use, which is convenient for a wide range of applications.

The rotary brush according to the present invention is characterized by being manufactured by the method for manufacturing a rotary brush according to any one of claims 1 to 3.

According to this structure, it is possible to provide a rotating brush capable of efficiently forming a high-density brush.

Further, a feature of the toothbrush according to the present invention is that the rotary brush of claim 4 is rotatably attached to the tip of the handle.

According to this structure, a toothbrush capable of efficiently forming a high-density brush can be provided. Therefore, while maintaining the advantages of the conventional toothbrush, the plaque can be removed more effectively than the conventional toothbrush. A toothbrush that can easily massage the gums can be provided.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail with reference to the drawings. 1 and 2 show a method for manufacturing a rotary brush according to this embodiment. First, 0.1-0.2m
A long fiber made of nylon 612 with a diameter of about m is cut with a cutter into a predetermined length according to the application, for example, a short fiber of about 20 mm for a toothbrush, and about 300 fibers are bundled to form a fiber bundle 1. Form. However, a plurality of long fibers may be bundled in advance and cut into short fibers having a predetermined length according to the application to form the fiber bundle 1. In this case, one end of the bundled fiber bundle may be fused or fixed with an adhesive in order to facilitate handling in the subsequent steps.

The length direction of the obtained fiber bundle 1 is made up and down, and one end side thereof is formed in the fixing jig 2 as an insertion hole 2
The lower die jig 4 is inserted and lifted from below the fixing jig 2 through the insertion hole 2a of the fixing jig 2 while being inserted into the a (FIG. 1A). One end of the fiber bundle 1 is erected from the insertion hole 2a, and the other end, which is a free end, is a fixing jig 2.
The bottom end of the fiber bundle 1 comes to project upward, and the bottom end of the lower jig 4
Abut the top surface of the (Fig. 1 (b)).

However, the lower die 4 is inserted into the insertion hole 2 from below.
The timing of inserting and raising the fiber bundle 1 into a may be after inserting the fiber bundle 1 into the insertion hole 2a or before inserting it, but before inserting the fiber bundle 1, raise it to a predetermined position in the insertion hole 2a. Then, the insertion position of the fiber bundle 1 is determined, which is convenient.

Next, a diameter expanding jig 3 capable of expanding the diameter of the fiber bundle 1 from above the free end 1a of the fiber bundle 1 erected on the fixing jig 2 toward the periphery from the substantially central position of the fiber bundle 1. To drop.
The diameter expanding jig 3 has a substantially rod shape, and its central portion 3a
Is a tapered outer peripheral portion 3b in which an ultrasonic transducer is embedded.
It is surrounded by. The tips of the central portion 3a and the outer peripheral portion 3b form a smooth surface 3c, and the outer peripheral portion 3b is on the upper side (rear end side).
It inclines in a diameter-expanding manner toward. Then, as the diameter-expanding jig 3 is lowered, first, the central portion 3a having a width of substantially the same diameter as the fiber bundle 1 comes into contact with the free end 1a of the fiber bundle 1,
When the diameter-expanding jig 3 is further lowered, the free end 1a of the fiber bundle 1 is forced to expand from the center position of the fiber bundle 1 toward the peripheral position (FIG. 1C). That is, the free end 1a of the fiber bundle 1 is expanded along the outer peripheral portion 3b of the diameter expanding jig, and when the diameter expanding jig 3 is lowered to the extent of substantially contacting the fixing jig 2, the free end of the fiber bundle 1 is freed. The end 1a is radially radially expanded and pressed and molded into a flat plate shape.

Next, from below the fixing jig 2, between the lower die jig 4 inserted and raised through the insertion hole 2a,
The fiber bundle 1 pressed and shaped into a flat plate is sandwiched, and the ultrasonic transducer embedded in the central portion 3a of the diameter-expanding jig 3 is oscillated to fuse the central portion of the bundled fiber bundle 1 Then, they are integrated into a flat plate shape (FIG. 2 (d)). Although the oscillator and its controller are omitted in the figure for simplification, ultrasonic fusion can be performed almost instantaneously (within 1 second) by using an ultrasonic oscillator with an output of about 100V × 200W. It can be fused and solidifies in 1-2 seconds. Since this ultrasonic welding method can perform the welding in a short time, it not only has a high processing speed and is excellent in productivity, but also, compared with other welding methods, unnecessary substances accompanying the welding adhere to the peripheral jig. Since it does not occur, it is clean and convenient because it eliminates the need for post-processing such as cleaning.

After that, at the central position of the central portion of the flat plate-shaped fiber bundle 1, the piercing pin 5 previously attached to the central portion of the lower die jig 4 is pushed up to form the shaft hole 1b (FIG. Two
(E)). By removing the lower die jig 4 and the diameter expansion jig 3,
It is possible to take out one molded rotating brush B as shown in FIG. 2 (f). Further, the free end side of the expanded fiber bundle 1 is cut in the diameter reducing direction by a cutter (not shown) so that the rotating brush B has a diameter of a predetermined length according to the purpose of use.

To produce a rotating brush for a toothbrush,
Further, as shown in FIG. 3, a large number of these molded rotating brushes B are overlapped with each other, and a shaft 6 having a predetermined length is passed through the shaft holes 1b. Then, as shown in FIG. 4, the pivotally supported rotating brush B is rotatably attached to a predetermined position on the end of the handle of the toothbrush A to manufacture the toothbrush. Rotating brush B
When superimposing a plurality of sheets, the rotating brushes are fixed and integrated with each other, so ultrasonic fusion or another joining method may be used, in which case they may be fixed individually. Alternatively, a plurality of sheets may be collectively attached and fixed at one time.

When the toothbrush is constructed, the shaft 6 is not always necessary, and for example, only the center position of the rotary brushes arranged at both ends of the plural rotary brushes that are superposed is perforated. In addition, a convex portion that can be inserted into the perforated portion of the rotary brush is formed on the side surface of the rotary brush holding portion on the toothbrush side, and the rotary brush can be mounted so as to be rotatable around the convex portion. Good.

Further, instead of the structure shown in FIG. 4, the rotary brush B is provided on the tip side (the end on the side opposite to the brush planting position) of the handle of an ordinary toothbrush provided with a fixed brush part in which a brush is fixedly planted.
May be attached so that both the fixed brush and the rotating brush can be used. Further, the rotary brush of the present invention can be used as a rotary brush of an electric brush.

[Other Embodiments] (1) In the above embodiment, an example in which fibers made of nylon 612 are used as the fibers has been shown. However, the present invention is not limited to this in carrying out the present invention. Various fibers can be selected according to the application, and when used in a toothbrush or the like, hydrophobic fibers such as nylon 610 and 11 can also be used. In that case, various hard and soft materials can be selected and used depending on the material of the brush. Furthermore, various resin fibers such as polyethylene and polypropylene resin other than nylon can be selected and used according to the application.

(2) In the above embodiment, the ultrasonic fusing method was used to integrate the central portions of the bundled fiber bundles, but the method for producing a rotary brush of the present invention is not limited to this method. Alternatively, a method such as heat fusion performed by providing a heating means such as a heater, high-frequency fusion, or the like may be used, and further, integration may be performed using an adhesive.

(3) In the above embodiment, the method of manufacturing the rotary brush has been described by using the resin bundle as the fiber bundle.
Instead of this, the rotary brush may be manufactured by using various metal fibers, ceramic fibers and the like. In that case, fusion of the central part of the bundled fiber bundle is performed using a higher temperature heat source.
Further, each fiber is not limited by the wording of the fiber, and may have a shape having a diameter smaller than its length, and its thickness, length, and cross-sectional shape depend on the purpose of use and application. Various items can be selected.

(4) In the above embodiment, an example was shown in which the fiber bundle 1 was inserted and fixed in one insertion hole 1a formed in the fixing jig 2, but the fixing jig 2 has a large number of insertion holes. 1a is formed, the fiber bundle 1 is inserted into each of these many insertion holes 1a, the diameter expanding jig is lowered from above, and the lower die jig 4 is inserted from below the insertion hole 1a. You may make it fuse | melt the center part of the fiber bundle 1 one after another.

(5) In the above-described embodiment, the length direction of the fiber bundle 1 having a predetermined length is set up and down, and one end side thereof is fixed to the fixing jig 2.
It was inserted into the insertion hole 2a formed in
Instead of this method, the length direction of the fiber bundle 1 having a predetermined length is set to the horizontal direction, and the insertion hole 2a formed in the fixing jig 2 is set to the horizontal direction, and the fiber bundle inserted into the insertion hole 2a. It is also possible to adopt a method in which the diameter of the free end side of the fiber bundle 1 is expanded by approaching the diameter expansion jig from the lateral direction (horizontal molding method).

(6) In the above-described embodiment, the rotary brush for toothbrush has been described as an example, but the rotary brush according to the present invention is not limited to the one for toothbrush, and it can be used for clothes cleaning and floor cleaning. The brush can be used as a rotating brush such as a brush for jewelery, a brush for jewelery polishing, a brush for buffing, a fur brush for a slow-electric device of a copying machine, and a cleaning brush. In particular, in the case of an electric slowing device, a resin having excellent conductivity such as containing fine carbon particles is used as a resin forming a brush.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing a manufacturing process of a rotary brush according to an embodiment of the present invention.

FIG. 2 is a schematic explanatory view showing a manufacturing process of a rotary brush according to an embodiment of the present invention.

FIG. 3 is a perspective view of a rotary brush for a toothbrush according to an embodiment of the present invention.

FIG. 4 is a perspective view of a toothbrush with the rotating brush of FIG.

[Explanation of symbols]

1 fiber bundle 1a Free end of fiber bundle 1b hole 2 Fixing jig 3 Expanding jig 6 axes B rotating brush

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Toshifumi Azuma             4-21-1 Minamihanadai, Kawachinagano City, Osaka Prefecture F term (reference) 3B202 AA07 AA19 AA21 AA30 AA34                       AB19 BA01 BB06 BE09 EA01                       EG01 EH07 JA02 JA03

Claims (5)

[Claims] 1. A long fiber is cut into a short fiber to prepare a fiber bundle composed of a large number of short fibers, and one end side in the length direction of this fiber bundle is fixed to a fixing jig, The free end side of the fiber bundle is radially expanded by moving a diameter expansion jig capable of expanding the diameter of the fiber bundle from the free end, which is the other end, from the approximate center position of the fiber bundle toward the periphery. And a flat brush, and a method of manufacturing a rotary brush in which one end side of the fixed fiber bundle is integrated. 2. The one end side of the fiber bundle is integrated by fusing, and the fiber bundle is pierced at a substantially central position on the fixed end side, and a shaft is axially supported through the pierced hole.
Method for manufacturing rotating brush. 3. The free end side of the fiber bundle is radially expanded, and then the free end side of the fiber bundle is cut in a diameter reducing direction so as to have a diameter of a predetermined length. Manufacturing method of rotating brush. 4. A rotary brush manufactured by the method for manufacturing a rotary brush according to claim 1. 5. A toothbrush in which the rotary brush according to claim 4 is rotatably attached to the tip of a handle.