JPS62231735A - Process for molding green tire - Google Patents

Process for molding green tire

Info

Publication number
JPS62231735A
JPS62231735A JP61074864A JP7486486A JPS62231735A JP S62231735 A JPS62231735 A JP S62231735A JP 61074864 A JP61074864 A JP 61074864A JP 7486486 A JP7486486 A JP 7486486A JP S62231735 A JPS62231735 A JP S62231735A
Authority
JP
Japan
Prior art keywords
bladder
bead
ply cord
drum
forming drum
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP61074864A
Other languages
Japanese (ja)
Other versions
JPH053825B2 (en
Inventor
Hideo Tatsuno
辰野 秀夫
Kazunori Nakamura
和則 中村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ohtsu Tire and Rubber Co Ltd
Original Assignee
Ohtsu Tire and Rubber Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ohtsu Tire and Rubber Co Ltd filed Critical Ohtsu Tire and Rubber Co Ltd
Priority to JP61074864A priority Critical patent/JPS62231735A/en
Publication of JPS62231735A publication Critical patent/JPS62231735A/en
Publication of JPH053825B2 publication Critical patent/JPH053825B2/ja
Granted legal-status Critical Current

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  • Tyre Moulding (AREA)

Abstract

PURPOSE:To achieve the prevention of the eccentricity of a bead, the occurrence of puckerings, and the inclusion of an air, by extending the diameter of a molding drum, by moving a wind-up bladder to an axial direction, by getting the inner end into the inside of both ends of the molding drum, and by folding back both ends of a ply cord as wrapping the bead under dilating the wind-up bladder. CONSTITUTION:A molding drum 7 and a wind-up bladder 15 together decrease their diameters, and a ply cord 19 is wrapped on their outer surfaces, and a bead 20 is moved to the position of an end core 12. When an air is supplied to a bladder 4 and the molding drum 7 increases its diameter, the bead 20 is stored in the step position of the end core 12. A cylinder 14 is extended, and a side drum 13 is moved inward to axial direction, and the inner end of the bladder 15 is gotten into the inside of both ends of the molding drum 7. Then the bladder 15 is dilated and lifts up both ends of the ply cord 19. A bushing ring 18 is moved inward to an axial direction, and presses against the bladder 15, and both ends of the ply cord 19 are folded back centering the bead 20. Therefore, the outer surface of both ends of the ply cord 19 and the outer surface of the ply cord 19 on the molding drum 7 are superposed under sion.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、空気タイヤの製造におい°ζ、成形ドラム上
に巻き付けられたプライコードを、該コードの両側に装
着されたビードを中心にして折り返し伏に巻き上げて、
生タイヤを成形する方法に関する。
DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention, in the manufacture of pneumatic tires, involves a process in which a ply cord wound on a forming drum is centered around beads attached to both sides of the cord. Fold it up and roll it up,
This invention relates to a method for forming green tires.

(従来の技術) この種、生タイヤの成形方法として、例えば、特公昭4
7−1560号公報、特公昭51−19872号公報に
記載のものが公知である。
(Prior art) As a molding method for this type of green tire, for example,
Those described in Japanese Patent Publication No. 7-1560 and Japanese Patent Publication No. 51-19872 are known.

この従来の技術を、第8〜11図に基き説明すれば、成
形ドラム50上にプライコード51を巻付け、その後、
該成形ドラムを拡径してその両側にビード52を打ち込
み、次に、巻上げブラダ53を膨張させて、ビード52
を中心としてプライコード51の両側を折返すものであ
った。
This conventional technique will be explained based on FIGS. 8 to 11. A ply cord 51 is wound around a forming drum 50, and then,
The diameter of the forming drum is expanded and beads 52 are driven into both sides of the drum, and then the winding bladder 53 is expanded to form beads 52.
Both sides of the ply cord 51 were folded around the center.

(発明が解決しようとする問題点) 上記生タイヤの成形に際しては、プライコード51の折
返し部に空気が溜ったり、しわが発生したりすることが
ないよう考慮されなければならない。
(Problems to be Solved by the Invention) When molding the green tire described above, consideration must be given to prevent air from accumulating in the folded portion of the ply cord 51 and wrinkles from occurring.

しかし、前記特公昭47−1560号公報に記載のもの
は、成形ドラム50の外径よりも巻上げブラダ53の外
径の方が小径である為、成形ドラム50の外周面にプラ
イコード51を巻付けたとき、プライコード51の両端
部と巻上げブラダ53間に不均一な間隙が生じるおそれ
があった。従って、ビード52のセント時、ビード52
が偏心したり、また、巻上げブラダ53を膨張させたと
き、巻上げブラダ53がプライコード5[を不均一に押
圧し、しわを発生さ・仕るおそれがあった。
However, in the device described in Japanese Patent Publication No. 47-1560, the outer diameter of the winding bladder 53 is smaller than the outer diameter of the forming drum 50, so the ply cord 51 is wound around the outer peripheral surface of the forming drum 50. When attached, there was a risk that uneven gaps would be created between both ends of the ply cord 51 and the winding bladder 53. Therefore, when bead 52 cents, bead 52
When the winding bladder 53 is expanded, the winding bladder 53 may press the ply cord 5 non-uniformly, causing wrinkles.

また、前記特公昭51−19872号公報に記載のもの
は、プライコード巻付は時、成形ドラムと巻上げブラダ
の外径は同一であるが、巻上げブラダ膨張時、ビード内
径を押圧するビードサポートを、巻上げブラダの膨張に
連動して拡径しなければならないものであった。この連
動動作は極めて微妙なものであり、そのタイミング調整
が悪いとしわが発生するおそれがあった。
Furthermore, in the method described in Japanese Patent Publication No. 51-19872, when the ply cord is wound, the outer diameters of the forming drum and the winding bladder are the same, but when the winding bladder is expanded, a bead support is provided to press the bead inner diameter. , the diameter had to be expanded in conjunction with the expansion of the hoisting bladder. This interlocking operation is extremely delicate, and if the timing is not properly adjusted, wrinkles may occur.

そこで、本発明は、プライコード!(=jけを容易にす
る為にドラム表面を滑らかにし、且つ、ビードをセット
する時のビード偏心防止とビード部の巻上げをよりタイ
トにして、しわ発生防止 空気介在防止を達成すること
ができる生タイヤ成形方法を提供することを目的とする
Therefore, the present invention is based on ply cord! (=The drum surface is made smooth to make it easier to set the bead, and the bead eccentricity is prevented when the bead is set, and the winding of the bead part is made tighter, thereby preventing wrinkles and air entrapment. The purpose is to provide a green tire forming method.

(問題点を解決するための手段) 上記目的を達成するため、本発明は、次の手段を講じた
。即ち、本発明の特徴とする処は、成形ドラムの両端部
に該ドラム径と同径に成形された巻上げブラダを位置さ
せ、前記成形ドラム並びに巻上げブラダの外周上にプラ
イコードを巻付け、成形ドラムと巻上げブラダの接続部
近傍に対応する位置のプライコードの外周にビードを配
置し、前記成形ドラム径を拡張すると共に、巻上げブラ
ダを軸方向に移動させてその内端部を成形ドラムの両端
部の内側に入り込ませ、次に巻上げブラダを膨張させて
プライコードの両端部をビードを包み込むように折返す
点にある。
(Means for solving the problems) In order to achieve the above object, the present invention takes the following measures. That is, the feature of the present invention is that winding bladders molded to the same diameter as the drum are positioned at both ends of a forming drum, and a ply cord is wound around the outer periphery of the forming drum and the winding bladder. A bead is placed on the outer periphery of the ply cord at a position corresponding to the connection area between the drum and the hoisting bladder to expand the diameter of the forming drum, and the hoisting bladder is moved in the axial direction to connect its inner end to both ends of the forming drum. Then, the winding bladder is expanded and both ends of the ply cord are folded back so as to wrap around the bead.

(作 用) 本発明によれば、成形ドラム外周面にプライコードを巻
付ける際、成形ドラムと巻上げブラダの外径が同一であ
るから、プライコードを安定良く巻付けることができる
。従って、成形ドラム拡径時、プライコードは均一に拡
径され、ビードセットも安定良くセントできる。
(Function) According to the present invention, when winding the ply cord around the outer circumferential surface of the forming drum, since the outside diameters of the forming drum and the winding bladder are the same, the ply cord can be wound stably. Therefore, when the diameter of the forming drum is expanded, the diameter of the ply cord is expanded uniformly, and the beads can be set in a stable manner.

巻上げブラダ膨張時は、該巻−Fげブラダの内端部は成
形ドラムの内側に入り込んでいるので、ビードの外側方
から均一にかつ強力に押圧力が作用することになり、空
気の排除及びしわ発生の防止が確実になる。
When the winding bladder is inflated, the inner end of the winding bladder is inside the forming drum, so the pressing force acts uniformly and strongly from the outside of the bead, eliminating air and Prevention of wrinkles is ensured.

(実施例) 以下、本発明の実施例を図面に基き説明する。(Example) Embodiments of the present invention will be described below with reference to the drawings.

第1図に示すものは、本発明に使用する生タイヤ成形機
であり1、■はその主軸を示す。該主軸1は回転自在に
支持されており、その内部に複数の空気通路2が形成さ
れている。主軸1の中途部にはセンタドラム3が固定さ
れ、該ドラム3の外周にブラダ4が周設されている。こ
のブラダ4と前記空気通路2とがブラダ5を介して接続
されている。このブラダ4を覆うようにセンタドラム3
の外周にはセグメント6が周方向に多数並設され、成形
ドラム7を形成している。セグメント6の内周にスライ
ド8が径方向内方に突設され、該スライド8はセンタド
ラム3に案内されて径方向に摺動自在であり、該スライ
ド8の内6jt+!にセンタドラム3に係脱自在に係合
するストッパ9が設けられている。前記成形ドラム7の
外周に凹溝10が周設され、該凹rMLQにゴムバンド
11が嵌着されている。
What is shown in FIG. 1 is a green tire forming machine used in the present invention, and 1 indicates its main shaft. The main shaft 1 is rotatably supported, and has a plurality of air passages 2 formed therein. A center drum 3 is fixed to a midway portion of the main shaft 1, and a bladder 4 is provided around the outer periphery of the drum 3. This bladder 4 and the air passage 2 are connected via a bladder 5. Center drum 3 so as to cover this bladder 4.
A large number of segments 6 are arranged in parallel in the circumferential direction on the outer periphery of the molding drum 7 to form a forming drum 7. A slide 8 is provided on the inner periphery of the segment 6 to protrude radially inward, and the slide 8 is guided by the center drum 3 and is slidable in the radial direction. A stopper 9 is provided which engages the center drum 3 in a detachable manner. A groove 10 is provided around the outer periphery of the molding drum 7, and a rubber band 11 is fitted into the groove rMLQ.

このゴムバンド11により、各セグメント6は縮径し、
センタドラム3の外周に当接している。
With this rubber band 11, each segment 6 is reduced in diameter,
It is in contact with the outer periphery of the center drum 3.

前記空気通路2を介してブラダ4に圧縮空気を供給する
ことにより、ブラダ4が膨張し、ゴムバンド11の張力
に抗してセグメント6が径外方向に移動して成形ドラム
7が拡径する。また逆に、ブラダ4の空気を陵くことに
より、各セグメント6はゴムバンド11により縮径する
By supplying compressed air to the bladder 4 through the air passage 2, the bladder 4 expands, the segments 6 move radially outward against the tension of the rubber band 11, and the forming drum 7 expands in diameter. . Conversely, by pushing the air in the bladder 4, each segment 6 is reduced in diameter by the rubber band 11.

前記成形ドラム7の両端部には径小段部とされたエンド
コア12が形成されている。
At both ends of the forming drum 7, end cores 12 each having a small diameter step are formed.

前記成形ドラム7の両端部の主軸1上にサイドドラム1
3が軸方向摺動自在に套嵌されている。このサイドドラ
ム13は、主軸1側に固定されたシリンダL4により軸
方向移動可能とされている。このシリンダ14は主軸1
に設けられた前記空気通!232から空気が供給されて
伸縮する。前記サイドドラム13の外周に巻上げブラダ
15が固定され、該巻上げブラダ15はブラダ16を介
して前記空気通路2に接続されており、該巻上げブラダ
15に空気を供給することにより膨張する。
Side drums 1 are mounted on the main shaft 1 at both ends of the forming drum 7.
3 is fitted on the sleeve so as to be slidable in the axial direction. This side drum 13 is movable in the axial direction by a cylinder L4 fixed to the main shaft 1 side. This cylinder 14 is the main shaft 1
Said air vent provided in! Air is supplied from 232 to expand and contract. A hoisting bladder 15 is fixed to the outer periphery of the side drum 13, the hoisting bladder 15 is connected to the air passage 2 via a bladder 16, and is inflated by supplying air to the hoisting bladder 15.

前記成形ドラム7及び巻上げブラダ15の縮径状態にお
いては、第1図に示すように、成形ドラム7及び巻上げ
ブラダ15の外周面ば面一とされている。成形ドラム7
を拡径した状態においては、第2図に示すように、巻上
げブラダ15の外径は、成形ドラム7の両端部の内周面
17より小径とされている。そして、第3図に示すよう
に、成形ドラム7の拡径状態において、巻上げブラダ1
5の内端部は、成形ドラム7の両端部の内部に入り込み
可能とされている。
In the diameter-reduced state of the forming drum 7 and the hoisting bladder 15, as shown in FIG. 1, the outer peripheral surfaces of the forming drum 7 and the hoisting bladder 15 are flush with each other. Forming drum 7
In the expanded state, the outer diameter of the winding bladder 15 is smaller than the inner peripheral surface 17 at both ends of the forming drum 7, as shown in FIG. As shown in FIG. 3, when the forming drum 7 is in the expanded diameter state, the hoisting bladder 1
The inner end portions of the molding drum 5 can enter inside both end portions of the forming drum 7 .

尚、18は、巻上げブラダ15の両側に配置されたブツ
シュリングであり、該ブツシュリング18は軸方向移動
可能に設けられている。
Reference numeral 18 denotes bushing rings arranged on both sides of the hoisting bladder 15, and the bushing rings 18 are provided so as to be movable in the axial direction.

次に、上記生タイヤ成形機を用いて生タイヤを成形する
方法を説明する。
Next, a method of molding a green tire using the green tire molding machine described above will be explained.

第1図に示す如く、成形ドラム7及び巻上げブラダ15
を共に縮径させ、その両者にわたって、その外周にプラ
イコード19を巻き付ける。次に、図示省略のビード保
持装置によりビード20を保持し、該ビード20をエン
ドコア12の位置に移動させる。
As shown in FIG. 1, the forming drum 7 and the winding bladder 15
are both reduced in diameter, and a ply cord 19 is wrapped around the outer periphery of both. Next, the bead 20 is held by a bead holding device (not shown), and the bead 20 is moved to the position of the end core 12.

次に、第2図に示す如く、センタドラム3のブラダ4に
空気を供給し、成形ドラム7を拡径させる。この拡径に
よりビード20はエンドコア12の段部に納まる。
Next, as shown in FIG. 2, air is supplied to the bladder 4 of the center drum 3 to expand the diameter of the forming drum 7. Due to this diameter expansion, the bead 20 fits into the stepped portion of the end core 12.

次に第3図に示すように、シリンダ14を伸長させ、サ
イドドラム13を軸方向内側に移動させ、巻上げブラダ
15の内端部を成形ドラム7の両端部内側に入り込ませ
る。
Next, as shown in FIG. 3, the cylinder 14 is extended, the side drum 13 is moved axially inward, and the inner end of the hoisting bladder 15 is inserted inside both ends of the forming drum 7.

次に、第4図に°示すように、巻上げブラダ15に空気
を供給して該ブラダ15を膨張させ、その外周に位置す
るプライコード19の両端部を持ち上げる。
Next, as shown in FIG. 4, air is supplied to the winding bladder 15 to inflate the bladder 15 and lift both ends of the ply cord 19 located on its outer periphery.

更に、ブツシュリング18を軸方向内側へ移動させて巻
上げブラダ15を押圧し、プライコード19の両端部を
ビード20を中心として折返し、該プライコード19の
両端部の外面と、成形ドラム7上のプライコード19の
外面とを密着状に重ね合せる。
Furthermore, the bushing ring 18 is moved inward in the axial direction to press the winding bladder 15, and both ends of the ply cord 19 are folded back around the bead 20, so that the outer surface of both ends of the ply cord 19 and the top of the forming drum 7 are folded. and the outer surface of the ply cord 19 are closely overlapped.

以−ヒで成形ドラム7上での生タイヤの成形が完了する
This completes the molding of the green tire on the molding drum 7.

以上はビードロック方式による生タイヤの成形方法であ
るが、第5〜7図に示すものは、ビード打込み方式によ
る生タイヤの成形方法である。このビード打込み方式で
は、エンドコアを用いずにビード20をセットする点が
前述のビードロック方式と異なり、その他は、略同じで
ある。
The above is a green tire molding method using the bead lock method, but what is shown in FIGS. 5 to 7 is a green tire molding method using the bead driving method. This bead driving method differs from the above-described bead lock method in that the bead 20 is set without using an end core, but otherwise is substantially the same.

尚 本発明は、上記実施例に限定されるものではない。Note that the present invention is not limited to the above embodiments.

(発明の効果) 本発明によれば、プライコード巻付は時、成形ドラムと
巻上げブラダの外径が同一であるがら、プライコードの
巻付けが均一になる。またプライコードの折返しに際し
ては、コア内部よりブラダ−インフレートするため、ビ
ード巻き上げはタイトになり、空気の溜りがなくなる。
(Effects of the Invention) According to the present invention, the ply cord is wound uniformly even though the outer diameters of the forming drum and the winding bladder are the same. Furthermore, when the ply cord is folded back, the bladder is inflated from inside the core, so the bead winds up tightly and no air is trapped.

またビードの偏心が防止される。Also, eccentricity of the bead is prevented.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の実施に使用する生タイヤ成形機の断面
図であり、かつビードロック方式による成形方法の第1
工程図、第2図は同第2工程図、第3図は同第3工程図
、第4図は同第4工程図、第5図はビード打込方式によ
る第1工程図、第6図は同第2工程図、第7図は同第3
工程図、第8〜11図は従来の成形方法を示す工程図で
ある。 7・・・成形ドラム、15・・・巻上げブラダ、19・
・・プライコード、20・・・ビード。 特 許 出 願 人 オーツタイヤ株式会社第 1 図 第2図 第31M 、第 4図
FIG. 1 is a cross-sectional view of a green tire forming machine used in carrying out the present invention, and is a first example of a forming method using a beadlock method.
Process diagram, Figure 2 is the second process diagram, Figure 3 is the third process diagram, Figure 4 is the fourth process diagram, Figure 5 is the first process diagram using the bead driving method, Figure 6 Figure 7 is the same second process drawing, and Figure 7 is the same third process drawing.
Process diagrams, FIGS. 8 to 11 are process diagrams showing a conventional molding method. 7... Molding drum, 15... Winding bladder, 19.
...Ply cord, 20...bead. Patent applicant Otsu Tire Co., Ltd. Figure 1 Figure 2 Figure 31M, Figure 4

Claims (1)

【特許請求の範囲】[Claims] (1)成形ドラムの両端部に該ドラム径と同径に成形さ
れた巻上げブラダを位置させ、前記成形ドラム並びに巻
上げブラダの外周上にプライコードを巻付け、成形ドラ
ムと巻上げブラダの接続部近傍に対応する位置のプライ
コードの外周にビードを配置し、前記成形ドラム径を拡
張すると共に、巻上げブラダを軸方向に移動させてその
内端部を成形ドラムの両端部の内側に入り込ませ、次に
巻上げブラダを膨張させてプライコードの両端部をビー
ドを包み込むように折返すことを特徴とする生タイヤの
成形方法。
(1) Position a hoisting bladder molded to the same diameter as the drum at both ends of the forming drum, wrap a ply cord around the outer periphery of the forming drum and the hoisting bladder, and place a ply cord near the connection between the forming drum and the hoisting bladder. A bead is placed on the outer periphery of the ply cord at a position corresponding to the diameter of the forming drum, and the winding bladder is moved in the axial direction so that its inner end enters inside both ends of the forming drum. A green tire forming method characterized by inflating a winding bladder and folding both ends of the ply cord so as to wrap around the bead.
JP61074864A 1986-03-31 1986-03-31 Process for molding green tire Granted JPS62231735A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61074864A JPS62231735A (en) 1986-03-31 1986-03-31 Process for molding green tire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61074864A JPS62231735A (en) 1986-03-31 1986-03-31 Process for molding green tire

Publications (2)

Publication Number Publication Date
JPS62231735A true JPS62231735A (en) 1987-10-12
JPH053825B2 JPH053825B2 (en) 1993-01-18

Family

ID=13559621

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61074864A Granted JPS62231735A (en) 1986-03-31 1986-03-31 Process for molding green tire

Country Status (1)

Country Link
JP (1) JPS62231735A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003033977A (en) * 2001-07-25 2003-02-04 Yokohama Rubber Co Ltd:The Method and device for controlling bladder outside diameter in tire production process
CN105383078A (en) * 2014-08-20 2016-03-09 住友橡胶工业株式会社 Tyre building machine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4933977A (en) * 1972-07-31 1974-03-28
JPS50138074A (en) * 1974-04-19 1975-11-04
JPS5119872A (en) * 1974-08-06 1976-02-17 Unitika Ltd

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4933977A (en) * 1972-07-31 1974-03-28
JPS50138074A (en) * 1974-04-19 1975-11-04
JPS5119872A (en) * 1974-08-06 1976-02-17 Unitika Ltd

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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JP4586312B2 (en) * 2001-07-25 2010-11-24 横浜ゴム株式会社 Method and apparatus for controlling bladder outer diameter in tire manufacturing process
CN105383078A (en) * 2014-08-20 2016-03-09 住友橡胶工业株式会社 Tyre building machine
JP2016043521A (en) * 2014-08-20 2016-04-04 住友ゴム工業株式会社 Tire molding former

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