JPH1156478A - Brush manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a brush excellent in a sweep and a tense of use. SOLUTION: A plurality of bundles 1 of sweep hairs drawn out from a take-up reel or the like are penetrated into a feeder 10 and a supporting device 20 and introduced into height control holes in a from 30 to provide differences of altitude δ among the bundles of sweep hairs. Each bundle 1 of sweep hairs is fixed binding with the feeder 10. And tips of the sweep hairs are grinned to treat baking process by a grinder 50 in a condition that the sweep hairs are fixed. Higher tips of the sweep hairs are formed to a half-spindle shape or the like with a large curvature, and lower tips of the sweep hairs are formed to a hemisphere shape or the like with a small curvature. The bundle 1 of the sweep hairs where the ball process are treated are cut by a cutter 60, and cut edges of the bundle 1 of the sheep hairs are attached combined by a heating plate or the like, to provide inserted into a head section of a handle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a brush, and more particularly to a method suitable for manufacturing a toothbrush.
More specifically, the present invention relates to a brush manufacturing method capable of performing a rounding process of a different shape according to a brush bundle, a brush position in the brush bundle, or the like at a tip of the brush, and manufacturing a brush excellent in brushability.

[0002]

2. Description of the Related Art In general, a toothbrush has a plurality of flocked holes formed in a head portion of a handle, and bundles a brush made of polyamide or polybutylene terephthalate (PBT) into a circular cross section or a rectangular cross section. It is manufactured by implanting and fixing it in a flocking hole using a metal piece called a flat wire. However, since the edge of the brush is formed by cutting at the tip of the brush and it is not comfortable to touch the gum, the brush tip is usually rounded with a grinder etc. There is a problem that not all brush tips can be sufficiently rounded depending on the shape (such as unevenness).

[0003] Japanese Patent Application Laid-Open No. 2-111305 discloses that a plurality of brush bundles drawn from a winding reel or the like are aligned and held so that the brush tips are located in the same plane, and are tightened and fixed. Then, the tip of the brush is rounded, and then the tightening of the brush is loosened, and each brush of the brush bundle is moved in the axial direction with respect to each other to contour the tip of the brush of the brush bundle by a height difference. A manufacturing method of fusing the brush at the base end side and implanting it in the head portion is described. This manufacturing method
Because a flat wire is not used, a bundle of brushes of various cross-sectional shapes can be formed.Because the brush bundle is rounded at the brush tip using a grinder or the like before fixing the brush bundle to the head portion, the manufactured toothbrush is all There is an advantage that the brush tip can be rounded.

[0004] As a method of flocking without using a flat wire, Japanese Patent Application Laid-Open Nos. 60-241404 and 2-99002
Japanese Patent Application Laid-Open No. 61-268208 and Japanese Patent Application Laid-Open No. 61-268208 disclose a method of fixing a brush bundle to a head portion by heat fusion.
In Japanese Patent Application Laid-Open No. Hei 2-503150, a method using in-mold is proposed.

[0005]

However, in the manufacturing method described in Japanese Patent Application Laid-Open No. 2-111305, the degree of rounding of the brush tip becomes uniform, so that the brushing property and the gingival property are reduced. There has been a problem that it is difficult to achieve both the improvement of the hit feeling and the comfort. That is, in the case of a toothbrush, it is desirable to sharpen the tip of the brush to some extent in order to improve the brushability such as the boundary between the teeth and the gap between the teeth and the gap between the teeth, but all the brushes are uniformly sharpened. Then, the brushability of the tooth surface decreases, and conversely, the brush end is rounded into a hemispherical shape to improve the brushability of the tooth surface, and the brushability at the boundary between teeth and the gap between teeth is improved. Decrease. The present invention
An object of the present invention is to provide a method for manufacturing a brush that is excellent in cleaning properties at the boundary between teeth and gums, and that is also excellent in gum contact comfort.

[0006]

According to a first aspect of the present invention, there is provided a brush manufacturing method according to the first aspect of the present invention, in which a plurality of brush bundles are introduced to provide a height difference between the tips of the brush bundles. After that, the brush tip of each brush bundle is rounded, and then implanted in the head portion of the handle.

According to a second aspect of the present invention, in the method of manufacturing a brush, a plurality of brush bundles are introduced to give a height difference between the brush tips in each brush bundle, and then the brushes in each brush bundle are provided. It is characterized in that the tip is rounded and then implanted in the handle head.

Further, in the method of manufacturing a brush according to the present invention, a plurality of brush bundles are introduced to give a height difference between the tips of the brush bundles and between the brush tips in the brush bundles. It is characterized in that the brush tip in each brush bundle is rounded and then implanted in the head portion of the handle.

The method for manufacturing a brush according to the invention described in claim 4 is based on claim 1, claim 2 or claim 3.
In the method for manufacturing a brush according to the invention described in above, after rounding the brushes of each brush bundle, at least one of the ends of each brush bundle or between the tips of the brushes in the brush bundle has a different or large difference in the height. It is characterized in that a height difference is further provided, and thereafter, the brush is implanted in the head portion of the brush.

Although the manufacturing method of the present invention can be applied to the manufacture of various brushes, it is particularly suitable for the manufacture of toothbrushes. As is well known, a brush, for example, a toothbrush is configured by implanting a plurality of brush bundles in a head portion of a grippable handle.
Usually, the handle and the head are integrally formed of a resin such as polypropylene, polyester, ABS, PMMA, polycarbonate, cellulose propionate, or polyacetal. However, polypropylene is preferable in terms of cost and moldability. It is also possible to improve elasticity by using a thermoplastic elastomer for a part of the handle by color molding to improve the elasticity. The brush uses filaments such as nylon or polyester, but these filaments can be combined,
Further, other resin filaments can be used.

The brush bundle is cut into a predetermined length,
Alternatively, it is wound and held on a winding reel or the like, and has a large number of brushes made of a thermoplastic resin such as nylon described above. In the case of a brush bundle wound and held on a winding reel as an example, the same number or a multiple (specified number) as the number of pieces to be implanted in the head portion are wound on and held by a winding reel or the like. It is pulled out by a bundle feeder or the like. The bristle bundle feeding device usually includes a pair of chuck portions that can run and pinch a specified number of brush bundles, and the brush bundle can be pinched by one chuck portion and the brush bundle can be inserted by the other chuck portion. , The one bundle is moved in one direction with respect to the other bundle, and the brush bundle is sent out, and the bundle of brushes is clamped and held by at least one chuck unit.

[0012] To give the height difference before and after rounding,
A molding die or the like is used in which the specified number of adjustment holes and the like are formed as a set of the same number as the number of brush bundles implanted in the head portion.
This molding die forms an adjustment hole having a different depth when giving a height difference between the brush bundles, and forms an adjustment hole having a curved bottom surface when giving a height difference between the brushes in the brush bundle. . And when giving a height difference using the above-mentioned mold,
When giving the height difference, the tip of the brush bundle is inserted into the adjustment hole of the molding die, and the tip of the brush bundle is brought into contact with the bottom surface of the adjustment hole. The height difference before and after the rounding process is such that the step (height difference) of the brush tip in the brush bundle or between the brush bundles is 0.3 mm or more, more preferably 0, in order to make the shape of the brush tip different by the rounding process. 0.5 mm or more is required.

For the rounding, a polishing device such as a grinder having a polishing plate is used. In general, the polishing apparatus rotates a polishing plate while moving the polishing plate in a plane orthogonal to the brush bundle, and rounds the brushes of one or more sets of brush bundles. By performing this rounding process, the brush has a rounded shape at the tip corresponding to its height (length). For example, a high brush has a relatively sharp tip, and a low brush has a gentle tip. It is processed into various shapes.

The rounding may be performed with a single polishing plate, but may be performed in a multi-step process in which a coarse polishing plate and a fine polishing plate are combined. The tip may be polished using rubber or rubber.

For cutting the bundle of brushes, a plurality of brush bundles are cut integrally (simultaneously) using a known cutting device. After the brush bundle is cut, the brush bundle is implanted in the head portion by a method well-known in the above-mentioned publication. For example, the cut ends of each of the cut brush bundles are bound by a heating plate, hot air, infrared rays, or the like, and then a set of brush bundles is implanted in the head portion by the above-described method such as in-mold. .

[0016]

According to a first aspect of the present invention, there is provided a brush manufacturing method according to the first aspect of the present invention, wherein the height of the brushes rising from the head portion in the completed state is made different, that is, the height of each brush bundle is made different. (Claim 1), the height of the brushes in the brush bundles is different (Claim 2), or both the height between the brush bundles and the height between the brushes in the brush bundles are different (Claim 3). Thereafter, all the brushes implanted in the head portion are rounded at once by a grinder or the like, so that the degree of rounding of the bristle changes according to the height, specifically, low (short). The brush is rounded into a gentle shape such as a substantially hemispherical tip, and the tall (long) brush is rounded into a sharp shape such as a half spindle shape. Therefore, the manufactured brushes not only have different brush heights, but also have different degrees of rounding of the brush tips, so that a high degree of freedom can be obtained in combination of the brush height and the tip shape, and excellent brushing properties Is obtained.

More specifically, a conical (semi-fusiform) brush with a rounded and tapered tip is used to form plaque in the gap (gingival sulcus) at the boundary between teeth and gums and teeth between teeth. It has the characteristic of being able to remove plaque effectively and has a good contact with gums, while the rounded hair with a hemispherical tip effectively removes plaque on the tooth surface without damaging the gums It has the feature of being able to. Therefore, by making these conical brushes with rounded and more tapered tips and bristles with hemispherical tips at the same time in the head portion (flocked portion) of one toothbrush, the teeth and gums are removed. It is possible to provide a toothbrush capable of effectively removing plaque in a gap between boundaries and plaque between teeth and effectively removing plaque on a tooth surface.

In particular, according to the method of manufacturing a brush according to the first aspect of the present invention, when manufacturing using a long bundle of brushes wound and held on a winding reel, one of the brush bundles connected to the winding reel is connected. There is no slack in the brush of the part, which is excellent in this respect. That is, in the brush manufacturing method according to the second and third aspects of the present invention, when manufacturing using a long brush bundle wound and held on a winding reel, the height of the brush in the brush bundle is made different. Thus, there is a problem that some of the brushes in the brush bundle connected to the winding reel are slackened. However, the method of manufacturing a brush according to the first aspect of the present invention can prevent the above problem and is excellent in this respect.

Further, in the brush manufacturing method according to the present invention, after the rounding process is performed, the height of the brush is adjusted again, that is, the height of the brush bundle, the height of the brush in the brush bundle. Or, to change both of these, you can set the degree of roundness of the tip of the brush and the height of the brush respectively,
A brush excellent in brushability can be manufactured. That is, the brush manufacturing method according to claim 4 adjusts the height of the brush to determine the degree of rounding of the brush tip first, and then adjusts the height of the brush after rounding, The roundness of the brush and the height of the brush can be set separately.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a brush manufacturing method according to an embodiment of the present invention applied to the manufacture of a toothbrush. FIGS. 1a to 1e are schematic diagrams showing an outline of the manufacturing process in alphabetical order, and FIG. 2b and 2c are partial enlarged views of FIG. 2a. FIG.

In this embodiment, as shown in FIG.
First, a plurality of brush bundles 1 are pulled out from a winding reel (not shown), and these brush bundles 1 are passed through two bristle bundle feeders 10 and a bristle bundle holding device 20. The length of the brush bundle 1, that is, the height difference δ of each brush bundle 1
(See FIG. 2). This height difference δ is usually 1 m
A value of about m is adopted. Although not shown, the brush bundle 1 has a large number of brushes such as a thermoplastic resin, is wound around a winding reel or the like, and is pulled out from the winding reel.

Although not shown, the bristle feed device 10 and the bristle holding device 20 have the same number (for example, four) of feed passages as the number of brush bundles implanted in the head portion of one or a plurality of toothbrushes.
There is a shutter or the like that protrudes and retracts into the feed passage and fastens the brush bundle 1 in the feed passage. The bristle bundle feeding device 10 and the bristle bundle holding device 20 respectively pass the brush bundles 1 so as to be able to travel in the respective feed passages, fasten the brush bundles 1 in the feed passages with shutters, and at least one of the bundles is operated by an actuator (not shown). The brush bundle 1 is reciprocated in the feeding direction (arrow) of the brush bundle 1 and is sent out to the molding die 30. The number (4) of the brush bundles described above and the specific number of the brush bundles described below are examples for convenience of description, and it goes without saying that the number of the brush bundles of the actual toothbrush can be arbitrarily set.

In the molding die 30, a plurality of adjustment holes are formed at different depths in groups of the same number (4) as the number of brush bundles implanted in the head portion of one toothbrush. It is inserted until the tip touches the bottom. In addition,
In this embodiment, the bottom surface of the adjustment hole is a flat surface, but may be a curved surface as in an embodiment described later.

That is, when giving the height difference δ for each brush bundle 1, the four brush bundles 1 are integrally fed to the forming die 3 by the feeder 10 and the holding device 20, and the four brush bundles 1 are provided.
Abut the bottom of the adjustment hole of the mold 30 (FIG. 1a).
reference). Then, as shown in FIG.
Is held by the devices 10 and 20 in a state where the height difference δ is given to the tip, and the tip of the brush bundle 1 is pulled out from the molding die 30.

Next, as shown in FIG. 1C, the four brush bundles 1 are placed in a state where the height difference δ is given to the tips of the devices 10 and 20.
The brush of the brush bundle 1 is held by a grinder 50
Rounding. The grinder 50 has a polishing plate or the like, and rotates the polishing plate in a plane orthogonal to the brush bundle 1 to round the brush tip of the brush bundle 1. Here, as shown in the enlarged view of FIG. 2, the brush of the brush bundle 1A having a high height is rounded in a substantially semi-spindle shape at the tip, and the brush bundle 1B having a low height is shown in the enlarged view of FIG. The tip is rounded into a hemisphere as shown. Although a detailed description of the grinder 50 is omitted, various grinders described in the above-mentioned Japanese Patent Application Laid-Open No. 2-111305 can be used as the grinder 50.

Subsequently, as shown in FIG. 1D, the cutter 60 is moved along the feeding device 10 on the holding device 20 side to cut each brush bundle 1, and thereafter, as shown in FIG. The cut end is heated and melted by the heating plate 70 and bound,
The brush is melted and fixed for each of the brush bundles 1. Then, the four brush bundles 1 are implanted in the head portion H of the toothbrush by the above-described in-mold or the like to complete the toothbrush T.

As shown in FIG. 2, the completed toothbrush T
Are four brush bundles 1 having different heights δ in the head portion H, that is, a high brush bundle 1A and a low brush bundle 1B.
The tip of the brush F of the high brush bundle 1A has a substantially semi-spindle shape (see FIG. 2b), and the tip of the brush F of the low brush bundle 1B has a hemispherical shape (see FIG. 2c). For this reason, this toothbrush T not only can effectively remove plaque on the tooth surface, but also can reliably wipe the gaps between the teeth and the gums, and can obtain excellent brushing properties. The contact is good and the usability is excellent.

FIGS. 3 and 4 are views for explaining a method of manufacturing a brush according to another embodiment of the present invention.
4A to 4E are schematic views showing the outline of the manufacturing process in alphabetical order, FIG. 4A is a longitudinal sectional view of a part of the manufactured toothbrush, and FIGS. 4B, 4C, and 4D are partially enlarged views of FIG. 4A. In this embodiment and the embodiment described later, the same portions as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

This embodiment uses a molding die 30 in which two deep holes and two shallow holes whose bottoms are substantially hemispherical are formed in the molding die 30. Then, as shown in FIG. 3A, the tips of the brush bundles 1 pulled out from the winding reel or the like are inserted into the holes of the molding die 30 by the devices 10 and 20, and the height difference between the brush bundles 1 and each brush The height (length) difference between the brushes in the bundle 1 is provided. That is, a height difference δ is provided between the tips of the brush bundles 1, and a height difference (a maximum height difference is indicated by s) is provided to the brushes of each brush bundle 1 such that the tips form a convex hemispherical surface (FIG. 4). In this embodiment, the height difference δ is about 0.5 mm, and the height difference s is about 0.5 mm.

Thereafter, similarly to the above-described embodiment,
The brush bundle 1 is held by the devices 10 and 20 in a state where the height difference δ is given to the brush bundle 1 and the height difference s is given to the brushes in the brush bundle 1 (FIG. 3 b), and each brush bundle 1 is rounded by the grinder 50. Processing is performed (FIG. 3c). Here, by this rounding process,
The high brush bundle 1 has the tip of the long brush F rounded to a substantially semi-spindle shape, the short brush F rounded to a substantially hemispherical shape, and the low brush bundle 1
Are rounded into a hemispherical shape at the tip of the long brush F, and into a flat shape with a chamfered tip at the short brush F (FIGS.
reference). Then, the brush bundle 1 is cut (FIG. 3)
d), the cut end of the brush bundle 1 is thermally fused by the heating plate 70 (FIG. 3E), and the cut brush bundle 1 is implanted in the head portion of the toothbrush to complete the toothbrush.

The toothbrush manufactured according to this embodiment has two high brush bundles 1 and two short brush bundles 1 in the head portion H, as shown in FIG. In the high brush bundle 1, the tip of the high brush F at the center has a substantially half spindle shape (FIG. 4).
b), the tip of the brush F having a short peripheral edge has a substantially hemispherical shape (see FIG. 4C), and the low brush bundle 1 has the distal end of the high brush at the center having a substantially hemispherical shape (see FIG. 4C). Has a flat tip (see FIG. 4d) with a rounded chamfer, and the tip shape of the brush F differs depending on the length. For this reason, a good toothbrush with excellent brushing properties can be obtained.

In the above-described embodiment shown in FIGS. 3 and 4, a high brush bundle and a low brush bundle are obtained by changing the depth of the holes of the molding die 30, but these holes are made equal in depth. It is also possible to make the height of the brush bundle uniform. Further, in the above-described embodiment, the bottom surface of the hole of the molding die 30 is a concave hemisphere, but it is also possible to form a convex hemisphere, a prism, or the like. It is appropriately selected according to the conditions.

FIGS. 5 and 6 illustrate a brush manufacturing method according to still another embodiment of the present invention, and FIGS.
Schematic diagram showing the outline of each manufacturing process in alphabetical order,
6A is a longitudinal sectional view of a part of the toothbrush manufactured by the same method, and FIGS. 6B and 6C are partially enlarged views of FIG. 6A. In this embodiment, steps up to rounding are performed in the same manner as in FIGS. 1A to 1C described above (FIGS. 5A, 5B, and 5C). Accordingly, each of the rounded brush bundles 1 is provided with a height difference δ to the brush bundle 1, and the tip of the brush F of the high brush bundle 1A has a spindle shape, and the tip of the brush F of the low brush bundle 1B has a hemispherical shape. Have. The height difference δ in this embodiment is desirably about 0.5 mm.

Next, as shown in FIG.
Is cut by the cutter 60 to make the lengths uniform. Then, as shown in FIG. 5e, the tightening of the brush bundles 1 of the feeding device 10 and the holding device 20 is loosened, and a height difference s (see FIG. 6a) between the brushes F in each of the brush bundles 1 is determined. Further, a new height difference δ0 is applied between the brush bundles 1 by the second molding die 90. The second mold 90 has four holes, the holes have different depths, and the difference in the depth of the holes is different from the difference δ in the depth of the holes of the mold 30 described above. Form a convex hemisphere. Then, when giving the height difference δ0, s, each of the brush bundles 1 is inserted into the hole of the molding die 90 until the tip contacts the bottom surface. Therefore, a new height difference δ0 is given between the brush bundles 1 and a height difference s is given to each of the brush bundles 1 so that the tip of the brush F forms a hemispherical surface. The height difference δ0 is about 2 mm, and the height difference s is 0.3
A value of about mm is adopted.

Thereafter, similarly to the above-described embodiments, the brush bundle 1 is cut by the cutter 60 and the irregularities of the brush on the base end side generated by the second molding die 90 are aligned (FIG. 5).
f) Then, the cut end of the brush F of the brush bundle 1 is
(Fig. 5g), and the four heat-fused brush bundles 1 are implanted in the head portion H to complete the toothbrush T.

As shown in FIG. 6, the toothbrush T manufactured by the manufacturing method of this embodiment includes two brush bundles 1A having a high difference δ0 and two brush bundles 1B having a low difference in the head portion H. The ends of these brush bundles 1A and 1B have a chevron shape,
That is, the brushes F of the brush bundles 1A and 1B have a height difference s. In the high brush bundle 1A, the tip of the brush F has a substantially semi-spindle shape (FIG. 6b), and in the low brush bundle 1, the tip of the brush F has a substantially hemispherical shape (FIG. 6c). Therefore, this toothbrush T
Has a better brushability, is softer in hitting, and has a better feeling in use.

FIG. 7 is a schematic diagram showing a method of manufacturing a brush according to still another embodiment of the present invention, and showing manufacturing steps in alphabetical order. In this embodiment, the female mold 3
0a and a male mold 30b, and a brush bundle 1
A height difference is given between them (FIG. 7a). Although not shown in the drawings, the female mold 30a has through holes formed in the same number as the hair bundles to be implanted in the head portion of one toothbrush, and the male mold 30b has adjustment rods having different lengths. Has the same number of insertion holes,
It is connected to a cylinder not shown.

FIG. 7A shows an example in which the height difference is given.
As shown in the figure, the brush bundle 1 is passed through the insertion hole of the female mold 30a,
The adjustment rod of the male mold 30b is inserted into the insertion hole of the female mold 30a from the side opposite to the brush bundle 1 to a predetermined depth, and the brush bundle 1 is pushed back by the adjustment rod. Therefore, each brush bundle 1 is provided with a height difference δ between the leading end portions. As the height difference δ, a value of about 0.7 mm is adopted. Although the tip of the adjustment rod of the male mold 30b is flat, a height difference may also be given to the brush F in the brush bundle 1 using an adjustment rod having a hemispherical convex shape or a concave hemispherical shape. It is possible.

Subsequently, similarly to the above-described embodiment, each of the brush bundles 1 is held by the devices 10 and 20 and pulled out from the female mold 30a (FIG. 7b), and the tip of each of the brush bundles 1 is polished by the grinder 50. (FIG. 7c). Therefore, as in the above-described embodiment, the brush F of the high brush bundle 1 is polished to have a substantially semi-spindle-shaped tip, and the brush F of the low brush bundle 1 is polished to have a substantially hemispherical shape. Then, each brush bundle 1 is cut by the cutter 60 between the feeding devices 10 and 10 (FIG. 7D).

Thereafter, a new height difference is given between the brush bundles 1 or between the brushes F in the brush bundles 1 by using the second molding die 90 composed of the female mold 90a and the male mold 90b in FIG. 7e. Female type 9
Reference numeral 0a has a plurality of insertion holes each of which is a set of the number of brush bundles to be implanted in the head portion, and the male mold 90b has the same number of adjustment rods each having a hemispherical shape with a concave tip. And
Similarly to the above-described application of the height difference by the molding die 30, the brush bundle 1 is passed through the insertion hole of the female die 90a, and the adjustment rod of the male die 90b is inserted into the insertion hole of the female die 90a from the opposite side. Is pushed back to give each brush bundle 1 a new height difference δ0. As the height difference δ0, a value of about 1.5 mm is adopted. Needless to say, the adjusting rod of the male mold 90b can be formed in a convex hemispherical shape at the tip end surface, or can be formed into another shape. It is appropriately selected according to the shape of the tip of the brush bundle required according to the use or the like.

Thereafter, similarly to the embodiment of FIG. 5 described above, the brush bundle 1 is cut by the cutter 60 to prepare the base end of the brush bundle 1 (FIG. 7F). Are heated and bound by the heating plate 70 (FIG. 7g). Then, these brush bundles are implanted in the head portion of the toothbrush, and the toothbrush T is completed.

Note that the toothbrush manufactured by the manufacturing method according to the embodiment of FIGS. 5 and 7 is not limited to the toothbrush of FIG. 6, but may be as shown in FIG. 8A, FIG. 8B or FIG. It is also possible to manufacture various toothbrushes. That is, as shown in the vertical cross-sectional view of FIG. 8A, a long brush bundle 1A having a substantially hemispherical tip is disposed on both longitudinal sides of the head portion H, and a short brush bundle 1B having a substantially semi-spindle-shaped tip is disposed between the long brush bundles 1A. In addition, as shown in the vertical sectional view of FIG. 8B, the end of the long brush bundle 1A arranged at both ends in the vertical direction of the head portion H is formed into a substantially semi-spindle shape, and the long brush bundle 1 is formed.
The tip of the short brush bundle 1B between A is formed into a concave substantially hemispherical shape, and further, as shown in the cross-sectional view of FIG. 1
A, it is also possible to arrange a short brush bundle 1B having a substantially hemispherical tip between the long brush bundles 1A.

[0043]

As described above, claims 1, 2, 3
According to the method for manufacturing a brush according to the invention described in (1), a height difference is provided between the brush bundles, between the brushes in the brush bundle or between the brush bundles and between the brushes in the brush bundle, and in a state where the height difference is provided. A toothbrush with a brush tip that is rounded and then fixed to the head, so that the brush tip shape can be changed, brushing properties are excellent, and the gingival is soft. Can be manufactured.

In particular, in the brush manufacturing method according to the present invention, a height difference is provided between at least one of the brush bundles or between the brushes in the brush bundle, and the brush tip is rounded with the height difference provided. After the rounding process, the height difference between the brush bundles or between the brushes of the brush bundles is further set, so that the height difference between the brush tip shape and the brush bundles or between the brushes in the brush bundles is set independently. It is possible to manufacture a toothbrush which is superior in brushability and usability.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an outline of a manufacturing process by a brush manufacturing method according to an embodiment of the present invention in alphabetical order.

FIG. 2 shows a toothbrush manufactured by the same manufacturing method,
a is a longitudinal sectional view of the head portion, b is a partially enlarged view of a, and c is a
It is an enlarged view of another part of.

FIG. 3 is a schematic diagram showing, in alphabetical order, outlines of manufacturing steps according to a brush manufacturing method according to another embodiment of the present invention.

FIG. 4 shows a toothbrush manufactured by the manufacturing method,
a is a longitudinal sectional view of the head portion, b is a partially enlarged view of a, and c is a
And d is an enlarged view of another part of a.

FIG. 5 is a schematic diagram showing, in alphabetical order, outlines of manufacturing steps by a brush manufacturing method according to still another embodiment of the present invention.

FIG. 6 shows a toothbrush manufactured by the same manufacturing method,
a is a longitudinal sectional view of the head portion, b is a partially enlarged view of a, and c is a
It is an enlarged view of another part of.

FIG. 7 is a schematic diagram showing, in alphabetical order, outlines of manufacturing steps according to a brush manufacturing method according to still another embodiment of the present invention.

FIG. 8 shows another embodiment of the toothbrush manufactured by the manufacturing method, wherein a is a vertical cross-sectional view of the head portion of the toothbrush according to one embodiment, and b is a vertical cross-sectional view of the head portion of the toothbrush according to another embodiment. And c are cross-sectional views of a head portion of a toothbrush according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Brush bundle 1A High brush bundle 1B Low brush bundle 10 Hair bundle feeder 20 Hair bundle holding device 30 Mold 50 Grinder 60 Cutter 70 Heating plate 90 Second molding die δ Height difference between brush bundles δ0 Height between brush bundles Difference s (maximum) height difference between brushes in the brush bundle F Brush H Head portion of brush handle T Toothbrush

Claims (4)

[Claims] 1. After introducing a plurality of brush bundles to give a height difference between the tips of the respective brush bundles, rounding the brush tips of the respective brush bundles, and then implanting them in the head portion of the handle. A method for manufacturing a brush, comprising: 2. A plurality of brush bundles are introduced to give a height difference between the brush tips in each brush bundle, and then the brush tips of each brush bundle are rounded, and then implanted in the head portion of the handle. A method of manufacturing a brush. 3. A plurality of brush bundles are introduced to provide a height difference between the brush tips and between the brush bundle tips in each of the brush bundles, and then the brush tips of each of the brush bundles are rounded to form a handle. A method for manufacturing a brush, wherein the brush is implanted in a head portion. 4. After rounding the brushes of each brush bundle,
4. The method for manufacturing a brush according to claim 1, wherein a height difference different from or greater than the height difference is further provided between at least one of the ends of each brush bundle or between the ends of the brushes within the brush bundle. .