JPS60137626A - Injection compression molding machine with toggle type opening and closing mechanism - Google Patents
Injection compression molding machine with toggle type opening and closing mechanismInfo
- Publication number
- JPS60137626A JPS60137626A JP24418283A JP24418283A JPS60137626A JP S60137626 A JPS60137626 A JP S60137626A JP 24418283 A JP24418283 A JP 24418283A JP 24418283 A JP24418283 A JP 24418283A JP S60137626 A JPS60137626 A JP S60137626A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- toggle
- toggle support
- tie bar
- molding machine
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/64—Mould opening, closing or clamping devices
- B29C45/68—Mould opening, closing or clamping devices hydro-mechanical
- B29C45/683—Mould opening, closing or clamping devices hydro-mechanical using both a toggle mechanism as mould closing device and another mechanism as mould clamping device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/1751—Adjustment means allowing the use of moulds of different thicknesses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
- B29C45/561—Injection-compression moulding
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
この発明はトグル式型開閉機構を有する射出圧縮成形機
に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an injection compression molding machine having a toggle type mold opening/closing mechanism.
一般的に射出成形法による成形は可塑化した樹脂を金型
内に射出し該金型内で冷却・固化して所望形状の成形品
を成形するものであるが、可塑化した樹脂が固化する際
収縮するいわゆる節輪みが発生するのは周知であり、か
つ、この節輪みによって成形品に変肉・変形等が生す゛
ることは避けられない。In general, injection molding involves injecting plasticized resin into a mold, cooling and solidifying it in the mold to form a molded product in the desired shape, but the plasticized resin solidifies. It is well known that so-called knots, which are caused by shrinkage, occur during molding, and it is unavoidable that this knots cause changes in thickness, deformation, etc. in the molded product.
ところが、近年超精密機械部品或は光学部品等の射出成
形による成形が盛んに行なわれるようになり、この節輪
みによる変形防止が不可避となっている。However, in recent years, injection molding of ultra-precision mechanical parts, optical parts, etc. has become popular, and it has become inevitable to prevent deformation due to this joint ring.
この節輪による変形防ＩＬ手段として、すでに金型内に
圧縮代を残して充填した樹脂を冷却・固化する過程で再
度圧縮するようにしたいわゆる圧縮成形法が提案されて
いる。A so-called compression molding method has been proposed as a deformation prevention IL means using this node ring, in which the resin that has already been filled into the mold with a compression allowance left is compressed again during the cooling and solidification process.
この圧縮成形法としては、■特開昭５１−７３０５８号
に記載の如く、特殊な型締シリンダにより多段型締を可
能に構成し、まず金型をわずかな圧縮代を残した状態で
型閉じして射出した後、再度最終゛型締め位置まで型締
めして所望の成形品を得る方法、■予め金型間或はプラ
テン間にストッパ或はくさび等を設けておき、まずスト
ッパ或はくさび等で規制された位置（圧縮代を残した位
置）まで型閉じして射出した後、ストッパ或はくさび等
を抜き、再度最終位置まで型締めして所望の成形品を得
る方法、更には、■予め金型内に圧縮シリンダを組込ん
でおき、ます型締装置により型締めして射出した後、金
型内の圧縮シリンダを作動して、キャビテイ面を圧縮し
て、所望の成形品を得る方法等が知られている。In this compression molding method, as described in JP-A-51-73058, a special mold clamping cylinder is used to enable multi-stage mold clamping, and the mold is first closed with a small amount of compression remaining. After injection, the mold is again clamped to the final mold clamping position to obtain the desired molded product. ■ A stopper or wedge is provided between the molds or platens in advance, and the stopper or wedge is After closing the mold to a regulated position (a position that leaves a compression allowance) and injecting, remove the stopper or wedge, etc., and close the mold again to the final position to obtain the desired molded product. ■A compression cylinder is installed in the mold in advance, and after the mold is clamped and injected using a mass mold clamping device, the compression cylinder in the mold is activated to compress the cavity surface and produce the desired molded product. There are known methods for obtaining it.
ところが、前記■の方法では、特殊な型締めシリンダを
必要とすると共に、油圧制御により多段階型締めを行な
うため型締め位置の正確な位置決め精度が得難い。 ■
の方法では型締めシリンダのストロークを機械的に規制
するため■の方法に比較して位置決め精度は得られるが
ストッパ或はくさび等の出入・調整機構が必要であると
共に直圧シリンダによる型締めであるため大きな型締め
シリンダを必要とする。However, method (2) requires a special mold clamping cylinder and performs multi-step mold clamping under hydraulic control, making it difficult to obtain accurate positioning accuracy of the mold clamping position. ■
In method (2), the stroke of the mold clamping cylinder is mechanically regulated, so positioning accuracy can be obtained compared to method (2), but it requires a stopper or wedge or other mechanism for moving in and out and adjusting the mold, and mold clamping with a direct pressure cylinder is not possible. Therefore, a large mold clamping cylinder is required.
更に、■の方法では、−挙に最終型締位置まで型締する
ので型締め位置の位置決めは比較的容易であり、かつ型
締め装置としても、直圧シリンダ或はトグル機構の使用
が可能であるからトグル機構を使用すれば型締め力も小
さくできるという利点はあるものの金型内に圧縮シリン
ダを組込んでいるため金型構造が腹雑となると共に、金
型全体を成形品が変わる毎に交換する必要があり金型費
用が嵩む。Furthermore, in method (2), the mold is clamped all at once to the final mold clamping position, so positioning the mold clamping position is relatively easy, and a direct pressure cylinder or toggle mechanism can be used as the mold clamping device. Although there is an advantage in that the mold clamping force can be reduced by using a toggle mechanism, the mold structure becomes complicated because a compression cylinder is built into the mold, and the entire mold has to be replaced every time the molded product changes. It needs to be replaced, which increases the mold cost.
等、いずれの方法も１−分満足のいくものではなかった
。etc., none of the methods were satisfactory.
この発明は上記に鑑みなされたものであって、タイバー
の軸線方向に間隔を置いて設けた固定盤とトグルサポー
ト及びこの固定盤とトグルサポートとの間に配設された
可動盤と、一端部をトグルサポートに装着し、他端を可
動盤に装着したトグル機構と、トグルサポートに装着し
た型開閉シリンダとを有するトグル式型開閉機構を有す
る射出成形機のトグルサポートのタイバーとの結合部に
ナツトを装着し、かつタイバーには該ナツトと螺合する
ネジ部を設け、ナラ１を回転することによりトグルサポ
ートの軸線方向位置を金型の型厚に応じて調整可能とす
ると共に、固定盤又はトグルサポートの反金型取何面側
とタイバーとの間に圧縮シリンダを配設したことにより
トグル式型開閉機構を有する射出成形機で、しかも金型
に圧縮シリンダを組込むことなく圧縮成形を可能にした
ものである。This invention has been made in view of the above, and includes a fixed plate and a toggle support provided at intervals in the axial direction of the tie bar, a movable plate disposed between the fixed plate and the toggle support, and one end portion of the tie bar. A toggle mechanism is attached to a toggle support, the other end is attached to a movable platen, and a mold opening/closing cylinder is attached to the toggle support. A nut is attached, and the tie bar is provided with a threaded part to be screwed into the nut, and by rotating the neck 1, the axial position of the toggle support can be adjusted according to the mold thickness of the mold, and the fixed platen Or, by installing a compression cylinder between the side of the toggle support opposite to the mold handle and the tie bar, compression molding can be performed using an injection molding machine with a toggle type mold opening/closing mechanism, without incorporating a compression cylinder into the mold. It made it possible.
以Ｆ図面に示した実施例に沿い説明する。The following will explain the embodiment shown in drawing F.
１は固定盤、２は可動盤、３はトグルサポート、Ａは一
端を可動盤２に装着し、他端をトグルサポート３に装着
したトグル機構、５はトグルサポート３に装着した型開
閉シリンダで該シリンダ５のピストンロッド５′端をト
グル機構（に装着し、型開閉シリンダの伸縮によりトグ
ル機構４を介して可動盤２を固定盤ｌに対して進退させ
る。1 is a fixed plate, 2 is a movable plate, 3 is a toggle support, A is a toggle mechanism with one end attached to the movable plate 2 and the other end is attached to the toggle support 3, 5 is a mold opening/closing cylinder attached to the toggle support 3. The end of the piston rod 5' of the cylinder 5 is attached to a toggle mechanism, and the movable platen 2 is moved forward and backward with respect to the fixed platen l via the toggle mechanism 4 by expansion and contraction of the mold opening/closing cylinder.
６．６１は金型で、一方を固定盤１側に、他方を可動盤
２側にそれぞれ装着されており、可動盤２の進退動によ
り開閉される。 ７．７１はタイバーで固定盤ｌとトグ
ルサポート３七を所定の間隔を置いてＵに連結すると共
に可動盤２をガイドする。Reference numeral 6.61 denotes a mold, one of which is mounted on the fixed platen 1 side and the other on the movable platen 2 side, and is opened and closed as the movable platen 2 moves forward and backward. Reference numeral 7.71 connects the fixed platen l and the toggle support 37 to U at a predetermined interval using a tie bar, and guides the movable platen 2.
以トの構成は従来のトグル式型開閉機構を有する射出成
形機と同様な構成であるが、本発明では以１“の構成が
追加されている。The following configuration is similar to that of a conventional injection molding machine having a toggle type mold opening/closing mechanism, but the present invention has the following configuration added.
８．８１は圧縮シリンダで固定盤１側（第１．２図）又
はトグルサポート３（図示せず）の反金型取（（面側に
装着されており、かつ該シリンダ８゜８１内には１１１
１記タイバー７．７１に連設されたピストン９．９１が
１仄人されている。 このピストン９，９１は図示した
如くタイバー７．７１の端部に該バー７．７′と一体に
形成梃するか（第１゜２図）或は図示しないが、タイバ
ー７．７′と′ピストン９．９１とを別体に杉成し、両
者をポルＩ・等の適当な固定具で一体に固定して、ピス
トン９゜９１をシリンダ８．８１内に嵌入するようにし
ている。 １０はトグルサポート３に形成したタイバー
７．７１挿通孔で鎖孔１０にタイバー７．７１を摺動自
在に挿通すると共に、タイバー７．７１のネジ部１１と
螺合するナラ）１２．１２’が回転可能に装着されてい
る。8.81 is a compression cylinder that is installed on the side of the stationary platen 1 (Fig. 1.2) or on the side of the toggle support 3 (not shown), and is 111
1. A piston 9.91 is connected to the tie bar 7.71. The pistons 9, 91 may be formed integrally with the tie bar 7.7' at the end of the tie bar 7.71 as shown (Figs. 1-2), or may be attached to the tie bar 7.7' and The piston 9.91 and the piston 9.91 are formed separately, and both are fixed together with a suitable fixture such as Pol I, so that the piston 9.91 is fitted into the cylinder 8.81. 10 is a tie bar 7.71 insertion hole formed in the toggle support 3, and the tie bar 7.71 is slidably inserted into the chain hole 10, and a neck (12.12') is screwed into the threaded portion 11 of the tie bar 7.71. is rotatably mounted.
１３．１３’はナツト１２．１２’と一体に装着された
スプロケットで、該スプロケット１３．１３’はチェー
ン１４或は図示しない歯車等を介してトグルサポート３
に装着した駆動モータ１５によりは油圧ブレーキ等の制
動装置、１７．１７’は駆動モー身１５の出力軸１８に
装着した回転取出歯車で、該歯車１７．１７’を介して
エンコーダ１９により回転数を検出してトグルサポート
３の移動量を検出すると共に、該エンコ−ダ１９は図示
しないコンパレークに接続され、コンパレータに入力さ
れた設定量とエンコーダ１９による検出量とを比較し、
トグルサポート３の移動量を制御する。13.13' is a sprocket that is integrally attached to the nut 12.12', and the sprocket 13.13' is connected to the toggle support 3 via a chain 14 or a gear (not shown).
A braking device such as a hydraulic brake is provided by the drive motor 15 attached to the drive motor 15, and 17.17' is a rotation extraction gear attached to the output shaft 18 of the drive motor body 15. The rotation speed is determined by the encoder 19 via the gear 17.17'. The encoder 19 is connected to a comparator (not shown) and compares the set amount input to the comparator with the amount detected by the encoder 19.
Controls the amount of movement of the toggle support 3.
この発明は以上の如き構成である。This invention has the configuration as described above.
次にその作用を説明する。Next, its effect will be explained.
予めトグル機構４により可動盤２の移動量は決定されて
いるので使用する金型６，６′が決まると型開閉量が決
定されるので金型６．６＋の型厚及び圧縮量αに基づく
設定量を設定器に入力し、駆動モータ１５を駆動すると
トグルサポート３はチェーン１４、スプロケット１３
、１３ ’ 及ヒナｙ）１２．１２’を介してタイバー
７．７１に沿って該バーの軸方向に移動され、設定位置
で停止りする。Since the amount of movement of the movable platen 2 is determined in advance by the toggle mechanism 4, once the molds 6 and 6' to be used are determined, the amount of opening and closing of the molds is determined, so it is based on the mold thickness and compression amount α of the mold 6.6+. When the set amount is input to the setting device and the drive motor 15 is driven, the toggle support 3 moves the chain 14 and sprocket 13.
, 13' and chick y) 12.12' along the tie bar 7.71 in the axial direction of said bar and stop at the set position.
この状態で型開閉シリンダ５を作動してトグル機構迭を
伸長して型閉じを行なうと金型６．６１は圧縮代αを残
した状態で型閉じされる。In this state, when the mold opening/closing cylinder 5 is operated to extend the toggle mechanism and close the mold, the mold 6.61 is closed with the compression allowance α remaining.
型閉じ後、図示しない射出装置を作動して金型６゜６′
内に可塑化した樹脂を射出した後、金型６，６′内で冷
却・固化する過程で圧縮シリンダ８，８１内のピストン
９．９′を作動してタイバー７．７１を伸長すると該バ
ー７．７１を介して圧縮代αを閉塞するように金型６又
は６′は型締めされ、金型６．６′内の樹脂を圧縮して
成形を完ｒし、成形完ｒ後、型開閉シリンダ５を型開き
方向に作動してトグル機構４を縮小し、成形品を離型す
る。After closing the mold, the injection device (not shown) is activated to complete the mold 6°6'.
After the plasticized resin is injected into the molds 6 and 6', the pistons 9 and 9' in the compression cylinders 8 and 81 are actuated to extend the tie bars 7 and 71. The mold 6 or 6' is clamped so as to close the compression allowance α through 7.71, and the resin in the mold 6.6' is compressed to complete the molding. The opening/closing cylinder 5 is operated in the mold opening direction to contract the toggle mechanism 4 and release the molded product.
以りのＬ程で一成形工程を完了し、以後前記の工程を繰
返す。One molding step is completed in the following L steps, and the above steps are repeated thereafter.
このようにして同一金型による成形を完了して金型を交
換する場合、前記したと同様に新らしい金型の型厚及び
圧縮量に基づく設定量を設定器に人力してトグルサポー
トの位置を調整した後、前記同様の成形工程で成形する
。When molding is completed using the same mold in this way and the mold is replaced, the setting amount based on the mold thickness and compression amount of the new mold is manually set on the setting device in the same manner as described above to position the toggle support. After adjusting, molding is performed in the same molding process as described above.
この発明は以上の如き構成であり、金型の開閉量をトグ
ルサポートの位置を調整することにより制御すると共に
金型の圧縮は固定盤又は可動盤と圧縮板との間に設けた
圧縮シリンダにより行なうので、型開閉をトグル機構に
より行なうことが可能となり、射出時の射出圧による型
開きの阻Ｉヒはトグル機構により機械的に行なうから型
開閉シリンダは小容計のもので良く、省エネルギー化が
図れると共に金型の型閉し位置規制のためのストッパ或
はくさび等も必要としないから構造も簡略化できる。This invention has the above-mentioned configuration, and the opening/closing amount of the mold is controlled by adjusting the position of the toggle support, and the mold is compressed by a compression cylinder provided between the fixed platen or the movable platen and the compression plate. Therefore, the mold can be opened and closed using a toggle mechanism, and the inhibition of mold opening due to the injection pressure during injection is mechanically performed by the toggle mechanism, so the mold opening/closing cylinder can be of a small capacity, saving energy. In addition, the structure can be simplified since there is no need for a stopper or wedge for regulating the closing position of the mold.
また、圧縮シリンダを圧縮板と固定盤又は可動盤との間
に設けているので個々の金型に圧縮シリンダを組込む必
要がないから金型構造も簡略化できる等の効果を有する
。Further, since the compression cylinder is provided between the compression plate and the fixed platen or the movable platen, there is no need to incorporate the compression cylinder into each mold, so that the mold structure can be simplified.
第１図及び第２図は本発明の一実施例を示す一部切截＋
Ｅ面図で、第１図は型閉じの状態図、第２図は型開きの
状態図、第３図は同側面図である。
Ｉ・・・固定盤 ２・・・可動盤
３・・・トグルサポート迭・・・トグル機構 ・５・・
型開閉シリンダ ７，７１・・・タイバー８・・・圧縮
シリンダ １１・・・ネジ部１２．１２’・・・ナントFIG. 1 and FIG. 2 are partially cutaway diagrams showing one embodiment of the present invention.
In the E side view, FIG. 1 is a state diagram of the mold closed state, FIG. 2 is a state diagram of the mold opened state, and FIG. 3 is a side view of the same. I...Fixed plate 2...Movable plate 3...Toggle support...Toggle mechanism ・5...
Mold opening/closing cylinder 7, 71...Tie bar 8...Compression cylinder 11...Threaded part 12.12'...Nant
Claims (1)
ルサポート及びこの固定盤とトグルサポートとの間に配
設された可動盤と、一端部をトグルサポートに装着し、
他端を可動盤に装着したトグル機構とトグルサポートに
装着した型開閉シリンダとを有するトグル式型開閉機構
を有する射出成形機のトグルサｇ−）のタイバーとの結
合部にナツトを装着し、かつタイバーには、該ナツトと
螺合するネジ部を設け、ナツトを回転することによりト
グルサポートの軸線方向位置を調整可能とすると共に固
定盤又はトグルサポートの反金型取付面側とタイバーと
の間に圧縮シリンダを配設したことを特徴とするトグル
式型開閉機構を有する射出圧縮成形機。A fixed plate and a toggle support provided at intervals in the axial direction of the tie bar, a movable plate disposed between the fixed plate and the toggle support, and one end attached to the toggle support,
A nut is attached to the joint part with the tie bar of a toggle switch g-) of an injection molding machine having a toggle type mold opening/closing mechanism having a toggle mechanism whose other end is attached to a movable platen and a mold opening/closing cylinder attached to a toggle support, and The tie bar is provided with a threaded part that is screwed into the nut, and by rotating the nut, the axial position of the toggle support can be adjusted, and the tie bar is connected to the tie bar and the fixed platen or the toggle support side opposite to the mold mounting surface. An injection compression molding machine having a toggle type mold opening/closing mechanism, characterized in that a compression cylinder is disposed at the top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24418283A JPS60137626A (en) | 1983-12-26 | 1983-12-26 | Injection compression molding machine with toggle type opening and closing mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24418283A JPS60137626A (en) | 1983-12-26 | 1983-12-26 | Injection compression molding machine with toggle type opening and closing mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60137626A true JPS60137626A (en) | 1985-07-22 |
| JPH0464850B2 JPH0464850B2 (en) | 1992-10-16 |
Family
ID=17114982
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24418283A Granted JPS60137626A (en) | 1983-12-26 | 1983-12-26 | Injection compression molding machine with toggle type opening and closing mechanism |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60137626A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4781218A (en) * | 1985-11-29 | 1988-11-01 | Toyota Jidosha Kabushiki Kaisha | Valve assembly for use in a fuel tank of a vehicle |
| JPH0212809U (en) * | 1988-07-07 | 1990-01-26 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56135A (en) * | 1979-06-15 | 1981-01-06 | Daicel Chem Ind Ltd | Injection, compression-molder |
| JPS56117870A (en) * | 1980-01-31 | 1981-09-16 | Honda Motor Co Ltd | Toggle type die clamping device of die-casting machine or the like |
| JPS58107258A (en) * | 1981-12-18 | 1983-06-25 | Honda Motor Co Ltd | Die clamping device for molding machine |
-
1983
- 1983-12-26 JP JP24418283A patent/JPS60137626A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56135A (en) * | 1979-06-15 | 1981-01-06 | Daicel Chem Ind Ltd | Injection, compression-molder |
| JPS56117870A (en) * | 1980-01-31 | 1981-09-16 | Honda Motor Co Ltd | Toggle type die clamping device of die-casting machine or the like |
| JPS58107258A (en) * | 1981-12-18 | 1983-06-25 | Honda Motor Co Ltd | Die clamping device for molding machine |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4781218A (en) * | 1985-11-29 | 1988-11-01 | Toyota Jidosha Kabushiki Kaisha | Valve assembly for use in a fuel tank of a vehicle |
| JPH0212809U (en) * | 1988-07-07 | 1990-01-26 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0464850B2 (en) | 1992-10-16 |
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