CN102791165A - Preparation method of toothbrush, and toothbrush prepared thereby - Google Patents

Abstract

The present invention provides a preparation method of a toothbrush comprising: the step of preparing toothbrush bristles, the step of implanting the prepared toothbrush bristles on an implant member, and the step of coupling the completely implanted implant member to a toothbrush head, and a toothbrush prepared thereby, wherein the step of preparing toothbrush bristles comprises: the step of collecting a strand of a plurality of toothbrush bristles in a line, and the step of adhering the lower portion of the collected strand of toothbrush bristles to make a bundle.

Description

Method for producing toothbrush and toothbrush produced by the method

technical field

The present invention relates to a method of manufacturing a toothbrush in an anchorless manner in which anchors are not used to mount bristles in a toothbrush body, and a toothbrush manufactured by the method.

Background technique

In general, when the method of fixing the bristles to the head of the toothbrush body uses an anchor made of metal, the bristles are easily released from the head compared to the "method without an anchor" that does not require the use of anchors. drop. In addition, it is difficult to diversify the shape (length, thickness, color, etc.) of the bristles. Therefore, recently in related industries, most toothbrushes are manufactured by the anchor-less method.

A toothbrush made by the anchor-less method includes bristles, a flat head insert in which the bristles are mounted, and a toothbrush body having a head to which the head insert is joined. Here, the head insert has a plurality of setting holes. A plurality of bristles are inserted into each mounting hole. The operation of inserting the bristles into the mounting holes is performed in such a way that the lower parts of the bristles are inserted into the ends of the mounting holes corresponding to the upper surface of the head insert so that the lower parts of the bristles are disposed on the lower surface of the head insert. Afterwards, the lower part of the bristles is adhered to the head insert by fusion.

However, in the conventional method of manufacturing an anchorless toothbrush, since the bristles must be installed in each mounting hole, it is not easy to manually perform the work of installing the bristles, so that a lot of time and labor are required, and the quality of the toothbrush cannot be ensured. In order to avoid the above problems, an automatic system has recently been proposed, but the process of automating the manufacture of toothbrushes must be complicated. Therefore, the structure of the automatic system is very complicated, and the automatic system is very expensive. In particular, automated systems are typically designed to produce only one toothbrush design. Therefore, if a new toothbrush design is developed, parts or the entire system must be changed or redesigned, imposing a huge financial burden.

Contents of the invention

Therefore, the present invention addresses the above problems arising in the prior art, and an object of the present invention is to provide a method of manufacturing a toothbrush at low cost in a relatively simple manner and a toothbrush manufactured by the method.

In order to achieve the above object, the present invention provides a method of producing a bristle bundle, the method comprising: a step of collecting a plurality of bristles and making them close together; and adhering first ends of the collected bristles to each other The step of adhering the bristles, thereby producing a bristle bundle.

In the step of collecting the bristles, the first ends of the collected bristles may be adhered by melting the first ends of the bristles to each other. Melting the first ends of the collected bristles may be performed by cutting the first ends of the collected bristles with a heated cutter and solidifying the cut surface of the first ends of the bristles.

In order to achieve the above object, the present invention provides a method of manufacturing a toothbrush, said method comprising: the step of producing a bristle bundle having a predetermined cross-sectional area by a method for producing a bristle bundle; cutting the adhered portion of the bristle bundle, A step of cutting the bristles so that the bristle bundles are divided into a plurality of unit bundles of bristles having a cross-sectional area corresponding to the size of the mounting hole of the head insert; inserting the part of the bristle bundles other than the adhered part into the head The corresponding mounting holes of the insert, so that the adhered part of the unit bristle bundle is arranged on the lower surface of the head insert, and the unit bristle bundle is fused to the head insert in such a way that the adhered part of the unit bristle bundle the step of attaching the bristles to the head insert; and the step of engaging the head insert with the head insert having unit tufts of bristles to the head of the toothbrush.

In the step of installing the bristles, the unit bristle bundles may be inserted into corresponding installation holes of the head insert through a jig having guide holes corresponding to the corresponding installation holes. Preferably, an outlet end portion of each guide hole of the jig facing the corresponding mounting hole may have a size equal to or greater than a cross-sectional area of an adhered portion of a corresponding unit bristle bundle. The size of each guide hole of the jig may increase at an inlet end of the guide hole into which the corresponding unit bristle bundle is inserted.

Furthermore, the size of each mounting hole of the head insert increases at its end corresponding to the lower surface of the head insert. In the case of this structure, the unit bristle bundles can be inserted into the corresponding mounting holes without using a separate jig.

In the step of installing the bristles, melting of the adhered portion of the unit bristle bundle to the head insert may be performed by applying liquefied thermoplastic resin to the lower surface of the head insert and curing the thermoplastic resin. Preferably, the head insert may have a recess in its lower surface in which the mounting hole is formed, and the liquefied thermoplastic resin is applied to the lower surface of the head insert in such a manner that the thermoplastic resin is filled into the head insert in the recess.

In order to achieve the above object, the present invention provides a method of manufacturing a toothbrush, said method comprising: a step of producing a bristle bundle having a predetermined cross-sectional area corresponding to a head insert mounting hole by a method of producing a bristle bundle ; Insert the part other than the sticking part of the bristle bundle into the mounting hole of the head insert, so that the sticking part of the bristle bundle is arranged on the lower surface of the head insert, and to place the sticking part of the bristle bundle the means of fusing to the head insert, the step of installing bristles of securing the tufts of bristles to the head insert; and the step of engaging the head insert of joining the head insert with the tufts of bristles to the head of the toothbrush.

In order to achieve the above objects, the present invention provides a method of manufacturing a toothbrush, the method comprising: inserting bristles into mounting holes of a head insert so that the lower parts of the bristles are disposed on the lower surface of the head insert, and The manner of fusing the lower portion of the bristles to the lower surface of the head insert, the step of installing the bristles to secure the bristles to the head insert; and the engaging head insert for joining the head insert with bristles to the head of the toothbrush The step of fitting, wherein, in the step of installing the bristles, the bristles are inserted into the installation holes of the head insert through a jig, and the jig has guide holes corresponding to the installation holes.

In order to achieve the above objects, the present invention provides a method of manufacturing a toothbrush, the method comprising: inserting bristles into mounting holes of a head insert so that the lower parts of the bristles are disposed on the lower surface of the head insert, and The means of applying the liquefied thermoplastic resin to the lower surface of the head insert and curing the liquefied thermoplastic resin, the step of attaching the bristles to the head insert; and the step of joining the head insert with the bristles to the toothbrush The step of engaging the head insert of the head.

In order to achieve the above objects, the present invention provides a toothbrush comprising: bristles, a head insert in which the bristles are installed; and a head to which the head insert is joined, and the toothbrush is manufactured by method to manufacture.

The head may have a receiving groove into which the head insert forcibly fits. The head and the head insert fitting in the head may be adhered to each other. Preferably, an engaging groove may be formed in a bottom of the head receiving groove along a periphery of the head receiving groove, and an engaging protrusion may be provided on the head insert, the engaging protrusion being fitted in the engaging groove.

The invention allows easy and cost-effective variety of bristle shapes (length, thickness, color, etc.).

Description of drawings

From the following detailed description in conjunction with the accompanying drawings, the above and other objects, features and advantages of the present invention can be more clearly understood, wherein:

Fig. 1 is the flowchart of the method for making toothbrush according to the present invention;

2 shows an example of a toothbrush manufactured by the method for manufacturing a toothbrush according to the present invention, FIG. 2(A) is a perspective view showing the entire toothbrush, FIG. 2(B) is a perspective view showing a head insert of the toothbrush, and Figure 2(C) is a perspective view showing the head of the toothbrush;

3 to 9 are views showing a method of manufacturing a toothbrush according to the steps of the present invention, and Fig. 3 to Fig. 5 show the steps of manufacturing bristles; Fig. 6 shows the step of cutting bristles; Fig. 7 and Fig. 8 show the step of installing the bristles in the head insert; and Figure 9 shows the step of joining the head insert to the toothbrush head;

10 is a perspective view showing another example of a toothbrush manufactured by the method of manufacturing a toothbrush according to the present invention; and

Figures 11 and 12 show the steps of a method of manufacturing a toothbrush according to the present invention for mounting bristles in a head insert having a style different from that of Figure 2 .

Explanation of the symbols of the main parts of the drawings

1: Bristles 5: Bristles bundle

10: Unit bristle bundle 20, 20A, 20B: Head insert

22: Recess 24, 24A, 24B: Mounting holes

26: Joint convex part 30: Head

32: Receiving groove 34: Engagement groove

60: Cutter 85: Fixture

86: Guide hole R: Thermoplastic resin

Detailed ways

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the thickness of lines or the size of elements may be exaggerated to more clearly and conveniently illustrate the present invention. In addition, the terms used will be defined in consideration of their functions in the present invention, and thus, the definitions of these terms may be changed according to user's or operator's intention or practice. Therefore, definitions of terms must be determined based on the entire contents of the specification.

Fig. 1 is a flowchart of a method of manufacturing a toothbrush according to the present invention. As shown in Figure 1, the method for manufacturing a toothbrush according to the present invention includes the steps of producing a bristle bundle (see S10), cutting the bristles (see S20), installing the bristles (see S30), and engaging a head insert (see S30). See S40). In step S10, a tuft of bristles is produced by collecting bristles (see reference numeral 1 in FIG. 3). In step S20, the bristle bundle (referring to Fig. 5 and reference numeral 5 of Fig. 6) of production is cut and is divided into several unit bristle bundles (referring to Fig. 2 and Fig. 6 to Fig. ). In step S30, the unit bristle tuft is installed in the head insert (see reference numeral 20 in FIGS. 2 and 7 to 9). At step S40, the head insert in which the bristles are installed is engaged to the head of the toothbrush body (see reference numeral 30 in FIGS. 2 and 9).

Fig. 2 shows an example of a toothbrush manufactured by the method of manufacturing a toothbrush according to the present invention. As shown in Figure 2, the toothbrush manufactured according to the above steps includes bristles, a flat head insert 20 and a toothbrush body, the bristles include unit bristle bundles 10, the bristles are installed in the flat head insert 20, and the toothbrush body includes a head 30 , the head insert 20 is joined to the head 30 .

The head insert 20 has a recess 22 in its lower surface. The recess 22 has an area other than the periphery of the lower surface of the head insert 20 . A plurality of mounting holes 24 are formed in the concave portion 22 of the head insert 20 . The unit bristle bundles 10 are installed in the installation holes 24, respectively. The mounting holes 24 are circular and have the same size. Furthermore, the mounting holes 24 are spaced apart from each other at regular intervals in the entire area of the recess 22 .

The head 30 has a receiving groove 32 into which the head insert 20 fits. Here, the head insert 20 is fitted in the receiving groove 32 so that the lower surface of the head insert 20 faces the bottom of the receiving groove 32 .

3 to 9 are views showing a method of manufacturing a toothbrush by steps according to the present invention. Hereinafter, steps of a method of manufacturing a toothbrush having bristles having the same shape as shown in FIG. 2 will be explained in detail with reference to FIGS. 3 to 9 .

1. Steps for producing bristle bundles

The step S10 of producing a bundle of bristles includes a step of processing the bristles (see S11), a step of collecting the bristles (see S12), and a step of adhering the bristles (see S13).

(a) Steps for processing bristles (see Figure 3)

The ends of the bristles 1 are treated by a treatment such as grinding or dipping so that tartar and plaque can be easily removed and damage to the gums can be prevented when the user brushes their teeth. FIG. 3 shows the treated bristles 1 . Fig. 3(A) shows that the bristles 1 are processed so that their ends are rounded. Fig. 3(B) shows that the bristles 1 are processed so that their ends are tapered.

(b) Step of collecting bristles (see Figure 4)

The plurality of bristles 1 that have been processed through the step S11 of processing the bristles are collected and neatly arranged together. After that, the paper tape 50 wraps the bristles 1 to tighten the bristles 1 so that they are close together.

In this step, instead of the paper tape 50, a tying frame having holes or grooves may be used to bind the treated bristles 1. When using a binding frame, the bristles 1 are densely inserted into the holes or grooves of the binding frame, because the shape of the collected brush hairs 1 is determined according to the shape of the holes or grooves of the binding frame (for example, if the holes or grooves of the binding frame are round, then the collected bristles are also round), the bundling frame is advantageous because the shape of the collected bristles 1 can be easily set compared to when a paper tape 50 is used.

The step S12 of collecting the bristles may include the step of arranging the bristles. In the step of arranging the bristles, the collected bristles 1 are arranged so that their ends form a predetermined shape. For example, the step of arranging the bristles can be realized by placing the lower part of the collected bristles 1 on the bristle arranging plate, the upper surface of the bristle arranging plate has a predetermined irregular shape, and the bristles 1 are pressed on the bristle arranging plate. Therefore, the ends of the collected bristles 1 are arranged in the same shape as the upper surface of the bristle arrangement plate.

(c) Step of attaching bristles (see Figure 5)

In the step of adhering the bristles, the lower parts of the bristles 1 collected in the step S12 of collecting the bristles are adhered together so that the collected bristles 1 form a bristle bundle.

The process of adhering the lower portion of the bristle 1 is achieved by cutting the lower portion of the bristle 1 using a cutter 60 heated to a predetermined temperature (for example, using a cutter having a heating wire therein). Here, when the collected bristles 1 are cut, the paper tape 50 holding the collected state of the bristles 1 is also cut together with the bristles 1 . The lower parts of the collected bristles 1 are melted by the heat of the cutter 60 as they are cut by the cutter 60 . Subsequently, the lower parts of the collected bristles 1 are adhered together by solidifying the melted lower parts.

Thus, in the step S13 of adhering the bristles, the bristle bundle 5 integrated by melting the lower part of the bristles 1 is produced. Of course, if the step of arranging the bristles is carried out in the step S12 of collecting the bristles, a bundle of bristles 5 whose ends are arranged in a specific shape is produced.

2. Steps of cutting bristles (see picture 6)

In the step of cutting the bristles, the bristle bundle 5 produced in the step S10 of producing the bristle bundle is divided into a plurality of unit bristle bundles 10 having a cross-sectional area corresponding to the cross-sectional area of the mounting hole 24 of the head insert 20 .

Here, the cutting tool 70 is used in the operation of dividing the tufts of bristles 5 into unit tufts of bristles 10 . The cutting tool 70 includes a table 72 and a plurality of cutters 74 arranged in a row on the upper surface of the table 72 .

The lower part of the bristle tuft 5 is placed on the table 72 of the cutting tool 70 and pushed towards the cutter 74 . Thereby, the adhered lower part of the bristle tuft 5 is cut by the cutter 74 and the bristle tuft 5 is thus divided into a plurality of tufts. Thereafter, the bristle bundles 5 that have been divided into a plurality of bundles are turned about 90 degrees and cut again in the same or similar manner, thereby forming several rectangular unit bristle bundles 10 . The interval at which the knives 74 are spaced apart from each other is set such that the unit bristle bundle 10 formed in the above step of cutting the bristles has a cross-sectional area corresponding to the area of the mounting hole 24 .

3. Steps to install the bristles

The step S30 of installing the bristles includes a step of inserting the bristles (see S31 ) and a step of fixing the bristles (see S32 ).

(a) Steps for inserting bristles (see Figure 7)

First, the head insert 20 is placed on the bristle-mounted base 80 such that the upper surface of the head insert 20 contacts the bristle-mounted base 80 and the lower surface of the head insert 20 faces upward.

Thereafter, the jig 85 is placed on the lower surface of the head insert 20 . Here, the jig 85 has a guide hole 86 corresponding to the mounting hole 24 of the head insert 20 when the jig 85 is placed on the lower surface of the head insert 20 . Of the two ends of each guide hole 86, the outlet end of the guide hole 86 facing the corresponding mounting hole 24 (the lower end of the guide hole 86 when viewed from the drawing) has a thickness equal to or slightly larger than the unit Dimensions of the cross-sectional area of the adhered lower part of the bristle tuft 10 . The cross-sectional area of the guide hole 86 increases from the outlet end of the guide hole 86 to the inlet end thereof (the upper end of the guide hole 86 when viewed from the drawing).

Subsequently, the end portion (the end portion opposite to the adhered lower portion) of the unit bristle bundle 10 is inserted into the inlet end portion of the guide hole 86 . Thereby, the unit bristle bundles 10 are respectively inserted into the mounting holes 24 corresponding to the guide holes 86 , and the adhered lower portion of the unit bristle bundles 10 is disposed in the recess 22 of the head insert 20 . Here, since each guide hole 86 is configured with an enlarged size of its inlet end, each unit bristle bundle 10 can be easily inserted into the corresponding guide hole 86 . In addition, the unit bristle bundles 10 inserted into the corresponding guide holes 86 may be easily inserted into the corresponding mounting holes 24 along the inner surfaces of the guide holes 86 . Therefore, the work of inserting the unit bristle bundle 10 into the mounting hole 24 can be performed quickly and accurately.

After the work of inserting the unit bristle tuft 10 into the mounting hole 24 is completed, the jig 85 is removed from the head insert 20 .

(b) The step of fixing the bristles (see Figure 8)

The thermoplastic resin R in liquid form is filled into the concave portion 22 of the head insert 20 into which the unit bristle bundle 10 has been inserted. After a predetermined period of time elapses, the thermoplastic resin R filled in the concave portion 22 of the head insert 20 in liquid form solidifies. In this way, when the thermoplastic resin R is cured, the unit bristle bundle 10 inserted into the mounting hole 24 is fixed to the head insert 20 . In other words, the head insert 20, the adhered lower portion of the unit bristle bundle 10, and the thermoplastic resin R are bonded together by the curing of the thermoplastic resin R. FIG.

If a head insert 20 (see FIG. 11 ) not having a recess 22 is used, thermoplastic resin R may be applied to the lower surface of head insert 20 up to a predetermined thickness instead of filling thermoplastic resin R into head insert 20 .

Meanwhile, instead of using liquefied thermoplastic resin R, it can be realized by inserting a heating plate into the concave portion 22 of the head insert 20 and applying heat and pressure thereto to melt the adhered lower part of the unit bristle bundle 10 Method of fixing the unit tuft 10 to the head insert 20 . Of course, in this case, the unit tufts of bristles 10 are fixed to the head insert 20 when the fusing process is complete.

3. Steps to Engage the Head Insert (See Figure 9)

The head insert 20 having passed the step S30 of fixing the bristles is fitted in the receiving groove 32 of the head 30 . After that, contact surfaces between the head insert 20 and the head 30 are adhered to each other using ultrasonic waves. The head insert 20 and the head 30 preferably have the following structures to enhance the bonding force therebetween.

The receiving groove 32 of the head 30 has dimensions adapted to allow the head insert 20 to forcibly fit therein. In addition, an engaging groove 34 is formed in the receiving groove 32 of the head 30 along the periphery of the receiving groove 32 . Engagement protrusions 26 are provided on the periphery of the lower surface of the head insert 20 . Accordingly, the engaging protrusion 26 of the head insert 20 is fitted into the engaging groove 34 of the head 30 . According to this structure, the head insert 20 is forcibly fitted in the receiving groove 32 , and at the same time, the engaging protrusion 26 is fitted in the engaging groove 34 . Accordingly, the contact area and contact strength between the head insert 20 and the head 30 may be increased. As a result, the engagement force between the head insert 20 and the head 30 can be enhanced.

Fig. 10 is a perspective view showing another example of a toothbrush manufactured by the method of manufacturing a toothbrush according to the present invention. According to the method for manufacturing a toothbrush of the present invention, not only a toothbrush with the same bristles as shown in FIG. 2 can be manufactured simply and at low cost, but also a toothbrush with different styles of bristles as shown in FIG. 10 can be manufactured. Meanwhile, each toothbrush shown in FIG. 10 can be manufactured by the above-mentioned method, or alternatively, the method including the step of producing a bristle bundle 5 with a predetermined cross-sectional area and then cutting the bristle bundle 5 and dividing into a plurality of unit bristle bundles 10 may not be used. to manufacture. That is, in the step S10 of producing a bristle bundle, it is possible to produce a bristle bundle having a cross section corresponding to the corresponding mounting hole 24, install the bristle bundle in the head insert 20, and engage the head insert 20 with the bristle bundle To the head 30 of the toothbrush body to make the toothbrush. Here, in the step of producing a bristle bundle having a cross-section corresponding to the corresponding mounting hole 24, the bundling frame mentioned in the description of the step S12 of collecting the bristles may be used.

In this method of manufacturing a toothbrush, since the bristle tufts each having a lower integral structure are installed in the head insert 20, excellent quality of the manufactured toothbrush can be ensured. In addition, the arrangement and shape of the bristles can be varied. In particular, in the step S12 of collecting bristles, if the bristles 1 having different thicknesses, colors, shapes, etc. are collected, a toothbrush in which different kinds of bristles 1 are installed in each mounting hole 24 can be manufactured.

Figure 11 shows the steps of installing bristles in a head insert 20A having a style different from that of Figures 2 and 7-9 according to the present invention. A mounting hole 24A is formed through the head insert 20A. Each mounting hole 24A expands in size from its lower end (when viewed in the drawings) to its one end corresponding to the head of the toothbrush. In the case where the mounting hole 24A has the above-described shape, its enlarged portion functions in the same function as that of the guide hole 86 of the jig 85 . Therefore, the work of inserting the unit bristle bundle 10 into the attachment hole 24A can be performed without using the jig 85, which is convenient. Furthermore, the adhered lower portion of the unit bristle bundle 10 inserted into the corresponding mounting hole 24A is seated in the enlarged portion of the mounting hole 24A. Therefore, the force with which the unit bristle bundle 10 is fixed to the head insert 20A can be further increased.

Figure 12 shows the steps of installing bristles in another style of head insert 20B. In the case of FIG. 12 , the mounting hole 24B is formed through the head insert 20B in a direction inclined at a predetermined angle, instead of being formed vertically through the head insert 20B. Specifically, adjacent mounting holes 24B are inclined in directions opposite to each other. In the case of manufacturing a toothbrush using the head insert 20B, the bristle array is shaped such that the unit bristle bundles 10 inserted into the mounting holes 24B cross each other. For reference, in this embodiment, a heating plate is preferably used to fix the unit bristle bundle 10 to the head insert 20B. That is, after the unit bristle bundle 10 is inserted into the corresponding mounting hole 24B, heat and pressure are applied to the adhered lower portion of the unit bristle bundle 10 using a heating plate. Thereby, the adhered lower part of the unit bristle tuft 10 is fused to the lower surface of the head insert 20 .

Although the preferred embodiment of the present invention has been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions can be made without departing from the scope and spirit as disclosed in the appended claims .

For example, in the above description, although the step S11 of processing the bristles in the step S10 of producing the bristle bundle is shown as being performed before the step S12 of collecting the bristles, the step S11 of processing the bristles may be performed after the step S12 of collecting the bristles. At the extreme, step S11 of treating the bristles may be carried out as the last step of the method of manufacturing a toothbrush.

In addition, the method of inserting the bristles into the head insert using a jig in the step S31 of inserting the bristles in the step S30 of installing the bristles and fixing the bristles to the head by coating the head insert with thermoplastic resin in the step S32 of fixing the bristles The method of the head insert can be used in the method of directly installing the bristles in the strand state on the head insert without producing a bundle form.

Claims (16)

1. A method of producing a tuft of bristles, comprising: the step of collecting a plurality of bristles and bringing them together; and The step of adhering the first ends of the collected bristles to each other by melting the first ends of said bristles to each other to produce a tuft of bristles. 2. The method according to claim 1, wherein, in the step of adhering the bristles, the first ends of the collected bristles are cut by using a heated cutter and the cut surfaces of the first ends of the bristles are cured to perform melting of the first ends of the collected bristles. 3. A method of making a toothbrush, comprising: the step of producing bristle tufts of bristle tufts having a predetermined cross-sectional area by the method according to claim 1; a step of cutting the adhered portion of the bristle bundle so that the bristle bundle is divided into a plurality of unit bristle bundles having a cross-sectional area corresponding to the size of the mounting hole of the head insert; inserting the portion other than the adhered portion of the unit bristle bundle into the corresponding mounting hole of the head insert so that the adhered portion of the unit bristle bundle is disposed on the lower surface of the head insert , and the step of fixing the unit bristle tufts to the mounting bristles of the head insert by fusing the adhered portion of the unit bristle tufts to the head insert; and The step of engaging a head insert having said unit tufts to an engaging head insert of a head of said toothbrush. 4. The method according to claim 3, wherein, in the step of installing the bristles, the unit bristle bundles are inserted into the corresponding installation holes of the head insert through a jig having a shape corresponding to the corresponding installation holes. guide hole. 5. The method according to claim 4, wherein the outlet end of each guide hole of the jig facing the corresponding mounting hole has a cross-section equal to or greater than the adhesion portion of the corresponding unit bristle bundle. The size of the area. 6. The method of claim 4, wherein a size of each guide hole of the jig increases at an inlet end portion into which the corresponding unit bristle bundle is inserted. 7. The method of claim 3, wherein each mounting hole of the head insert increases in size at its end corresponding to the lower surface of the head insert. 8. The method according to claim 3, wherein, in the step of installing the bristles, the bonding of the unit bristle bundles is performed by applying liquefied thermoplastic resin to the lower surface of the head insert and curing the thermoplastic resin. Attach part to the melting of the head insert. 9. The method of claim 8, wherein the head insert has a recess in its lower surface, the mounting hole is formed in the recess, and The liquefied thermoplastic resin is applied to the lower surface of the head insert by filling the thermoplastic resin into a recess of the head insert. 10. A method of making a toothbrush comprising: the step of producing bristle bundles having a predetermined cross-sectional area corresponding to the mounting hole of the head insert by the method according to claim 1; inserting the portion other than the adhered portion of the bristle bundle into the mounting hole of the head insert so that the adhered portion of the bristle bundle is disposed on the lower surface of the head insert, and the step of securing the bristle tufts to the mounting bristles of the head insert by fusing the adhered portion of the bristle tufts to the head insert; and The step of engaging a head insert having said tufts of bristles to an engaging head insert of a head of said toothbrush. 11. A method of making a toothbrush comprising: inserting the bristles into the mounting holes of the head insert so that the lower portions of the bristles are disposed on the lower surface of the head insert and to fuse the lower portions of the bristles to the lower surface of the head insert Superficially, the bristle-mounting step of securing said bristles to said head insert; and the step of engaging a head insert having said bristles to an engaging head insert of the head of said toothbrush, Wherein, in the step of installing the bristles, the bristles are inserted into the installation holes of the head insert through a jig, and the jig has guide holes corresponding to the installation holes. 12. A method of making a toothbrush comprising: inserting the bristles into the mounting holes of the head insert so that the lower portions of the bristles are disposed on the lower surface of the head insert, and applying liquefied thermoplastic resin to the lower surface of the head insert and curing said liquefied thermoplastic resin, the step of securing said bristles to said head insert mounting bristles; and The step of engaging a head insert having said bristles to a head insert of said toothbrush. 13. A toothbrush comprising: bristles; a head insert in which the bristles are mounted; and a head to which the head insert is joined, the toothbrush being passed according to The method described in any one of claim 3 or 9 to 11 is manufactured. 14. The toothbrush of claim 13, wherein the head has a receiving groove into which the head insert positively fits. 15. The toothbrush of claim 14, wherein the head and a head insert fitting in the head are adhered to each other. 16. A toothbrush according to claim 14 or 15, wherein an engaging groove is formed in the bottom of the head receiving groove along the periphery of the head receiving groove, and An engaging protrusion is provided on the head insert, and the engaging protrusion is fitted in the engaging groove.

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