JP3947378B2

JP3947378B2 - Method for producing rotary brush material sheet and rotary brush material sheet

Info

Publication number: JP3947378B2
Application number: JP2001307672A
Authority: JP
Inventors: 勝敏北村
Original assignee: 北村昌廣
Priority date: 2001-10-03
Filing date: 2001-10-03
Publication date: 2007-07-18
Anticipated expiration: 2021-10-03
Also published as: JP2003111618A

Description

【０００１】
【発明の属する技術分野】
本発明は、主として歯ブラシに使用するための回転ブラシ用素材シートの製造方法に関する。
【０００２】
【従来の技術】
従来、図８のように、柄部材１の先端側の１対の延出片２に柄部材１の長手方向と直角な支軸３を介して回転ブラシ４を回転自在に支持した歯ブラシ５は、例えば特開２０００−８３７３６号などで知られている。その場合の回転ブラシ４は、環状ハブの外周面から素線群が放射状に突出した構造を備えており、環状ハブの外周面と素線とは素線の断面に相当する面のみで接合していることになり、特に素線が細い場合は接合強度が不足し、素線が歯と歯の間に挟まった時などに素線が切断したり抜けたりし易い。
【０００３】
【発明が解決しようとする課題】
本発明は素線が切断したり抜けたりしない回転ブラシとそれの簡単な製造方法を提供することを目的としている。
【０００４】
【課題を解決するための手段】
請求項１の発明は、水平姿勢に固定されたプレート１０の円形孔１１から熱可塑性樹脂製の多数の素線から成る素線群１２をチャック１３で掴み上方へ所定量突出保持させ、素線群先端面１６の中央に下方へ尖った円錐ピン１８を押し込んで素線を四方へ均一に押し広げ開花させ、円錐ピン１８の外周に嵌合したクランプ１９を下降させて四方へ開いた素線をプレート１０上に固縛し、この状態からチャック１３を素線群１２から解放し、チャック１３を所定量下降させて再び素線群１２を掴み、引き続きプレート１０の下面に沿うカッター２１により素線群１２を切断し、同時にチャック１３を横の待機位置へ移し、かつ円錐ピン１８を上昇させて横の待機位置へ移し、円形孔１１には下方からホーン２３を嵌入し、クランプ１９内へは下方へ付勢された基準ピン２４を下降嵌入させ、この状態でホーン２３から素線中央部に熱を加えて素線中央部の円形孔１１対向部を溶解し、溶融状態の環状ハブ２６ａができた直後に熱の供給を絶ち、次に加圧体２９により基準ピン２４をその下端の小径円柱部２５がホーン２３の上端面に当接するまで押し下げ、溶融環状バブ２６ａの素材の一部を半径方向外方へ押し出して上下からクランプ１９およびプレート１０で固縛された素線群１２の各素線２２の根元部を埋めて補強するようにした、回転ブラシ用素材シート２７の製造方法である。
【０００５】
請求項２の発明は、請求項１に記載された回転ブラシ用素材シートの製造方法により製造された、回転ブラシ用素材シートである。
【０００６】
【発明の実施の形態】
図１〜図６は、請求項１の回転ブラシ用素材シートを製造する際の各工程を示しており、まず、図１においては、水平姿勢に固定されたプレート１０の円形孔１１から例えばナイロン（登録商標）のような熱可塑性樹脂製の多数の素線（直径：例えば０．１５ｍｍ）から成る素線群１２がチャック１３に掴まれて上方へ所定量突出保持されている。チャック１３内のリングゴム１４外周のチャンバー１５内には加圧エアーが供給されており、これによりリングゴム１４が縮径して素線群１２を固縛し、図示の位置に保持している。１６は素線群１２の先端面（上端面）である。
【０００７】
図２においては、図１の素線群先端面１６の中央に円錐ピン１８が押し込まれ、これにより素線が四方へ均一に押し広げられ開花している。
【０００８】
図３においては、クランプ１９が下降し、四方へ開いた素線がプレート１０上に固縛されている。この状態からチャック１３への加圧エアーの供給が遮断されてチャック１３が素線群１２を解放し、図４の位置まで下降して再び素線群１２を掴み、引き続き、カッター２１が左方へ突出して素線群１２を切断し、同時に、図５のようにチャック１３は左方の待機位置へ移動し、引き続き円錐ピン１８は上昇して左方の待機位置１８ａへ移動する。
【０００９】
図６において、円形孔１１には下方からホーン２３が嵌入し、クランプ１９内にはばね１７により下方へ付勢された基準ピン２４が下降し、その下端中央の小径円柱部２５の下端面がホーン２３の平坦な上端面に向かい付勢されている。この状態でホーン２３から素線群中央部に急速に熱が加えられ、これにより素線中央部の略円形孔１１対向部は溶融し、溶融状態の環状ハブ２６ａができた直後に熱の供給を絶つ。その時には、溶融状態の環状ハブ２６ａの外周面からやや軟化した素線２２の群が放射状に突出した構造となる。即ち、素線２２の根元端面（例えば円形）はその端面の部分で環状ハブ２２ａに接合している。
【００１０】
次に、図６の状態から、油圧シリンダロッドのような加圧体２９により基準ピン２４をその小径円柱部２５がホーン２３の上端面に当接するまで押し下げ、溶融環状ハブ２６ａの素材の一部を半径方向外方へ押し出し（押出し量Ｌ１：例えば０．５〜１ｍｍ）、図７（Ａ）のように、上下から型（クランプ１９及びプレート１０）で固縛された素線群１２の各素線２２の根元部を埋める。その時、溶融ハブ素材は素線根元部に巻き付き、接着し、その状態で例えば３〜５秒保持することによりその周囲は固化して環状ハブ２６ができ、かつその外周面から放射状に突出している各素線２２の根元部は環状ハブ２６の素材により補強されて、回転ブラシの素材となるシート２７が得られる。このシート２７は、ホーン２３の下降、クランプ１９、基準ピン２４の上昇直後に横のノズル２８から供給されるエアーにより右に吹き飛ばされて図示されていない収納容器内に溜まる。このようにして得られた複数枚のシート２７は、既述の従来公報に示されているような細棒に相当するステンレス管に通され、両端からプレス治具により加圧された状態でステンレス管に通電し発熱させてハブ２６を融着させ、又は接着剤により一体化して筒状ボスを有する回転ブラシを得る。上記ホーン２３の発熱手段としては、例えば２８ＫＨｚの超音波、電熱によるインパクト加熱等のように、瞬時に例えば３００℃に達する方法を採用可能である。
【００１１】
図６の溶融環状ハブ２６ａの外周面が図７のように半径方向外方へ押し出される時、ハブ２６ａの溶融素材は図７（Ｂ）に示すように、隣接した素線２２の間の微細空間内で毛細管現象（と考えられる）により素線２２の表面を伝わり、結果的に素線の根元部が太く、根元部から離れるに連れて細くなり、テーパー状に素線２２の根元部表面が補強される。
【００１２】
図６の溶融環状ハブ２６ａをそのまま冷却固化させ、得られたシート半製品の外周部又はハブを囲む環状部を別の上下型で固縛し、環状ハブ部分を上下から例えばセラミックヒータで加熱軟化させ、引き続き充分軟化したハブを上下から別の型で押圧してハブ外周部の素材を半径方向外方へ張り出させてやや軟化した状態の隣接素線の根元部を補強することもできる。
【００１３】
シート半製品の外周部を固縛した状態で、上下からの加熱のみで素線根元部の補強が可能なことも確認した。即ち、ボス部（ハブ）と素線の継ぎ部に熱を加えて徐々に表面が柔らかくなり溶けだすと、継ぎ部や素線の密集している根元部には表面張力が働き、素線の根元部が太くなる。
【００１４】
【発明の効果】
請求項１、２の発明によると、回転ブラシの各素線２２の根元部が丈夫になり、素線の切断、抜け、傾斜などの不具合を確実に回避することができる。
【図面の簡単な説明】
【図１】第１工程と装置を示す縦断面略図である。
【図２】第２工程と装置を示す略図である。
【図３】第３工程と装置を示す略図である。
【図４】第４工程と装置を示す略図である。
【図５】第５工程と装置を示す略図である。
【図６】第６工程と装置を示す略図である。
【図７】第７工程と装置を示す略図である。
【図８】従来公知の歯ブラシの斜視図である。
【符号の説明】
４回転ブラシ
２２素線
２６環状ハブ
２６ａ溶融環状ハブ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a material sheet for a rotating brush mainly used for a toothbrush.
[0002]
[Prior art]
Conventionally, as shown in FIG. 8, a toothbrush 5 in which a rotating brush 4 is rotatably supported by a pair of extending pieces 2 on the distal end side of a handle member 1 via a support shaft 3 perpendicular to the longitudinal direction of the handle member 1. For example, JP-A-2000-83736 is known. In this case, the rotating brush 4 has a structure in which the strand group protrudes radially from the outer peripheral surface of the annular hub, and the outer peripheral surface of the annular hub and the strand are joined only by a surface corresponding to the cross section of the strand. In particular, when the wire is thin, the bonding strength is insufficient, and the wire is likely to be cut or pulled out when the wire is sandwiched between the teeth.
[0003]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION An object of the present invention is to provide a rotating brush in which a strand does not cut or come off and a simple manufacturing method thereof.
[0004]
[Means for Solving the Problems]
According to the first aspect of the present invention, a strand group 12 made of a large number of thermoplastic resin wires is grasped by a chuck 13 from a circular hole 11 of a plate 10 fixed in a horizontal position, and is projected and held upward by a predetermined amount. A conical pin 18 that is pointed downward is pushed into the center of the front end surface 16 of the group to uniformly spread the element wire in all directions so as to blossom, and a clamp 19 fitted to the outer periphery of the cone pin 18 is lowered to open the element wire in all directions. The chuck 13 is released from the strand group 12 from this state, and the chuck 13 is lowered by a predetermined amount to grip the strand group 12 again. The line group 12 is cut, and simultaneously the chuck 13 is moved to the horizontal standby position, and the conical pin 18 is raised and moved to the horizontal standby position. A horn 23 is inserted into the circular hole 11 from below and into the clamp 19. Is below In this state, the reference pin 24 urged downward is inserted into the center of the wire, and the wire is heated at the center of the wire to melt the portion opposite the circular hole 11 at the center of the wire, thereby forming the molten annular hub 26a. Immediately after that, the supply of heat is stopped, and then the reference pin 24 is pushed down by the pressure member 29 until the small-diameter cylindrical portion 25 at the lower end thereof comes into contact with the upper end surface of the horn 23, and a part of the material of the molten annular bubble 26 a is This is a method for manufacturing a material sheet 27 for a rotating brush, which is pushed outward in the direction and filled with a base portion of each strand 22 of the strand group 12 secured from above and below by the clamp 19 and the plate 10 to be reinforced. .
[0005]
Invention of Claim 2 is the raw material sheet for rotary brushes manufactured by the manufacturing method of the raw material sheet for rotary brushes described in Claim 1 .
[0006]
DETAILED DESCRIPTION OF THE INVENTION
FIGS. 1 to 6 show the respective steps when manufacturing the rotary brush material sheet according to claim 1. First, in FIG. 1, for example, nylon is formed from the circular hole 11 of the plate 10 fixed in a horizontal posture. A strand group 12 made of a large number of strands (diameter: for example, 0.15 mm) made of a thermoplastic resin such as (registered trademark) is gripped by the chuck 13 and is projected and held upward by a predetermined amount. Pressurized air is supplied into the chamber 15 on the outer periphery of the ring rubber 14 in the chuck 13, whereby the ring rubber 14 is reduced in diameter, and the strand group 12 is secured and held at the position shown in the figure. . Reference numeral 16 denotes a front end surface (upper end surface) of the strand group 12.
[0007]
In FIG. 2, the conical pin 18 is pushed into the center of the strand group front end surface 16 of FIG. 1, and thereby the strands are uniformly spread in all directions and flowered.
[0008]
In FIG. 3, the clamp 19 is lowered, and the strands that are open in all directions are secured on the plate 10. From this state, the supply of pressurized air to the chuck 13 is cut off, the chuck 13 releases the wire group 12, descends to the position of FIG. 4 and grips the wire group 12, and the cutter 21 continues to the left. As shown in FIG. 5, the chuck 13 moves to the left standby position, and the conical pin 18 ascends and moves to the left standby position 18a.
[0009]
In FIG. 6, the horn 23 is inserted into the circular hole 11 from below, the reference pin 24 urged downward by the spring 17 is lowered into the clamp 19, and the lower end surface of the small-diameter cylindrical portion 25 at the center of the lower end is lowered. The horn 23 is biased toward the flat upper end surface. In this state, heat is rapidly applied from the horn 23 to the central portion of the strand group, whereby the portion facing the substantially circular hole 11 in the central portion of the strand is melted and heat is supplied immediately after the molten annular hub 26a is formed. Break. At that time, the group of the slightly softened strands 22 protrudes radially from the outer peripheral surface of the molten annular hub 26a. That is, the base end face (for example, circular shape) of the strand 22 is joined to the annular hub 22a at the end face.
[0010]
Next, from the state of FIG. 6, the reference pin 24 is pushed down by a pressure member 29 such as a hydraulic cylinder rod until the small-diameter cylindrical portion 25 abuts against the upper end surface of the horn 23, and a part of the material of the molten annular hub 26a is obtained. Is pushed outward in the radial direction (extrusion amount L1: 0.5 to 1 mm, for example), and as shown in FIG. 7 (A), each of the strand groups 12 secured from above and below with a die (clamp 19 and plate 10). Fill the root of the strand 22. At that time, the molten hub material is wound around and bonded to the wire root portion, and is held in that state for 3 to 5 seconds, for example, to solidify the periphery thereof to form the annular hub 26 and project radially from the outer peripheral surface. The base part of each strand 22 is reinforced by the material of the annular hub 26, and the sheet | seat 27 used as the material of a rotating brush is obtained. Immediately after the horn 23 is lowered, the clamp 19 and the reference pin 24 are raised, the sheet 27 is blown to the right by the air supplied from the horizontal nozzle 28 and is collected in a storage container (not shown). The plurality of sheets 27 thus obtained are passed through a stainless steel tube corresponding to a thin rod as shown in the above-mentioned conventional publication, and stainless steel is pressed from both ends with a pressing jig. A rotating brush having a cylindrical boss is obtained by energizing the pipe and generating heat to fuse the hub 26 or by integrating them with an adhesive. As the heating means of the horn 23, a method of instantaneously reaching, for example, 300 ° C., such as impact heating by ultrasonic waves of 28 KHz and electric heat, can be employed.
[0011]
When the outer peripheral surface of the molten annular hub 26a of FIG. 6 is pushed radially outward as shown in FIG. 7, the molten material of the hub 26a is fine as shown in FIG. 7B. In the space, it is transmitted through the surface of the strand 22 by capillarity (considered), and as a result, the root portion of the strand becomes thicker and becomes thinner as it moves away from the root portion, and the surface of the root portion of the strand 22 is tapered. Is reinforced.
[0012]
The molten annular hub 26a in FIG. 6 is cooled and solidified as it is, and the outer peripheral portion of the obtained sheet semi-finished product or the annular portion surrounding the hub is secured with another upper and lower molds, and the annular hub portion is heated and softened from above and below with, for example, a ceramic heater Then, the base portion of the adjacent strand in the slightly softened state can be reinforced by pressing the sufficiently softened hub with another mold from above and below to project the material on the outer periphery of the hub outward in the radial direction.
[0013]
It was also confirmed that the wire root part could be reinforced only by heating from above and below, with the outer periphery of the semi-finished sheet sheet secured. In other words, when heat is applied to the joint between the boss (hub) and the strand, the surface gradually softens and melts, surface tension acts on the joint and the root where the strands are dense, The root becomes thicker.
[0014]
【The invention's effect】
According to the first and second aspects of the present invention, the root portion of each strand 22 of the rotating brush becomes strong, and it is possible to reliably avoid problems such as cutting, disconnection, and inclination of the strand.
[Brief description of the drawings]
FIG. 1 is a schematic longitudinal sectional view showing a first step and an apparatus.
FIG. 2 is a schematic diagram showing a second process and apparatus.
FIG. 3 is a schematic diagram showing a third step and apparatus.
FIG. 4 is a schematic diagram showing a fourth process and apparatus.
FIG. 5 is a schematic diagram showing a fifth step and apparatus.
FIG. 6 is a schematic diagram showing a sixth step and apparatus.
FIG. 7 is a schematic diagram showing a seventh step and apparatus.
FIG. 8 is a perspective view of a conventionally known toothbrush.
[Explanation of symbols]
4 rotating brush 22 strand 26 annular hub 26a melting annular hub

Claims

A strand group 12 made of a number of strands made of thermoplastic resin is gripped by a chuck 13 from a circular hole 11 of the plate 10 fixed in a horizontal position, and is projected and held upward by a predetermined amount. The conical pin 18 that is pointed downward is pushed in and the wire is uniformly spread and flowered in all directions, and the clamp 19 fitted to the outer periphery of the conical pin 18 is lowered to secure the wire opened in the four directions on the plate 10. Then, the chuck 13 is released from the strand group 12 from this state, the chuck 13 is lowered by a predetermined amount and the strand group 12 is gripped again, and then the strand group 12 is cut by the cutter 21 along the lower surface of the plate 10, At the same time, the chuck 13 is moved to the horizontal standby position, and the conical pin 18 is moved up to the horizontal standby position. A horn 23 is inserted into the circular hole 11 from below, and the clamp 19 is urged downward. Standard In this state, heat is applied from the horn 23 to the central portion of the strand to melt the portion facing the circular hole 11 in the central portion of the strand, and heat is supplied immediately after the annular hub 26a in the molten state is formed. Next, the reference pin 24 is pushed down by the pressure member 29 until the small-diameter cylindrical portion 25 at the lower end thereof abuts against the upper end surface of the horn 23, and a part of the material of the molten annular bubble 26a is pushed outward in the radial direction. The manufacturing method of the raw material sheet | seat 27 for rotary brushes which filled the base part of each strand 22 of the strand group 12 fastened with the clamp 19 and the plate 10 from the upper and lower sides, and was reinforced.

A rotating brush material sheet produced by the method for producing a rotating brush material sheet according to claim 1 .