JPS5933686B2 - Yarn crimping device - Google Patents
Yarn crimping deviceInfo
- Publication number
- JPS5933686B2 JPS5933686B2 JP14804677A JP14804677A JPS5933686B2 JP S5933686 B2 JPS5933686 B2 JP S5933686B2 JP 14804677 A JP14804677 A JP 14804677A JP 14804677 A JP14804677 A JP 14804677A JP S5933686 B2 JPS5933686 B2 JP S5933686B2
- Authority
- JP
- Japan
- Prior art keywords
- crimping
- disc
- sinker
- shaped cam
- rotation
- 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.)
- Expired
Links
Landscapes
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
Description
【発明の詳細な説明】 本発明は改良された糸捲縮装置に関するものである。[Detailed description of the invention] The present invention relates to an improved yarn crimping device.
さらに詳しくは、いわゆる賦型法によって、熱可塑性合
成繊維に高速かつ微少ピッチで捲縮を施すことを可能に
した糸捲縮装置に関するものである。More specifically, the present invention relates to a yarn crimping device that is capable of crimping thermoplastic synthetic fibers at high speed and at minute pitches using a so-called shaping method.
賦型法による糸捲縮装置としては、従来から、固定シン
カと可動シンカとの嵌合を利用するもの（たとえば特公
昭３２−６９６１号公報、特公昭４７−１２５２９号公
報）が知られている。As yarn crimping devices using the forming method, devices that utilize the fitting of a fixed sinker and a movable sinker (for example, Japanese Patent Publication No. 32-6961, Japanese Patent Publication No. 47-12529) have been known. .
しかしながら、特公昭３２−６９６１号公報に開示され
ているような糸捲縮装置では、嵌合箇所におけるシンカ
の数が少ないため、シンカとの接触面で糸がすべりやす
く、微少ピッチでの捲縮が不可能である。However, in a yarn crimping device such as that disclosed in Japanese Patent Publication No. 32-6961, the number of sinkers at the fitting location is small, so the yarn tends to slip on the contact surface with the sinkers, resulting in crimping at minute pitches. is not possible.
また、捲縮の効果自体、小さいので好ましくない。Further, the effect of crimp itself is small, which is not preferable.
特公昭４７−１２５２９号公報に開示されているような
糸捲縮装置では、可動シンカの開閉運動を制御するカム
自身は固定されているので、可動シンカと固定カムとの
間のすべり摩擦が大きく、高速回転には適さない。In the yarn crimping device as disclosed in Japanese Patent Publication No. 47-12529, the cam itself that controls the opening and closing movement of the movable sinker is fixed, so the sliding friction between the movable sinker and the fixed cam is large. , not suitable for high speed rotation.
本発明の目的は、上述のような従来の糸捲縮装置の欠点
を克服し、高速かつ微少ピッチで糸に捲縮を施すことを
可能にする、改良された糸捲縮装置を提供することにあ
る。An object of the present invention is to provide an improved yarn crimping device that overcomes the drawbacks of the conventional yarn crimping device as described above and makes it possible to crimp yarn at high speed and at minute pitches. It is in.
この目的を達成するために、本発明の糸捲縮装置は、
イ）駆動軸と、
口）該駆動軸に回転可能に取付けられた捲縮ヘッドと、
ノ１）該捲縮ヘッドの側面に該捲縮ヘッドの回転中心と
同心円上に突出せしめられ、直径がｄなる複数本の係合
ピンと、
二）該捲縮ヘッドの外周に円形列状に互いに空隙をはさ
んで取付けられた複数の固定シンカと、ホ）該固定シン
カの側面に取付けられ、一端が上記固定シンカ間の各空
隙に位置する複数の可動シンカと、
へ）前記捲縮ヘッドに隣接し、前記捲縮ヘッドの回転中
心から偏心した回転中心を有してブラケットにより回転
自在に支承される円板状カムとからなり、
ト）該円板状カムは、
（１）側面に前記捲縮ヘッドの係合ピンと係合し、直径
りがｄ＋２ｅと等しいか、またはそれよりも犬である中
心点が該円板上カムの回転中心と同心円状に設けられた
係合穴を有し、前記捲縮ヘッドの係合ピンによって前記
捲縮ヘッドと同一方向に回転伝達せしめられ、
（ｉｉ） 側面に前記可動シンカの他端が嵌合する溝
が該円板状カムの回転中心と同心円状に設けられ、
チ）前記捲縮・ベッドを駆動軸を介して回転させ、前記
円板状カムの溝に前記可動シンカの他端を嵌合させるこ
とによって、前記円板状カムの偏心方向にある可動シン
カを閉鎖状態に、偏心方向と反対の方向にある可動シン
カを開放状態にし、前記捲縮ヘッドが回転中にも前記可
動シンカの閉鎖、開放の位置を一定に保ちつつ、前記固
定シンカと可動シンカとの嵌合部に糸を走行させて捲縮
を施すことを特徴とするものである。To achieve this objective, the yarn crimping device of the present invention comprises: (1) a drive shaft; (1) a crimp head rotatably attached to the drive shaft; and (1) a side surface of the crimp head. 2) a plurality of engagement pins having a diameter d and projecting concentrically with the center of rotation of the crimping head; 2) a plurality of engagement pins attached to the outer periphery of the crimping head in a circular row with gaps between them; a) a plurality of movable sinkers attached to the sides of the fixed sinker, one end of which is located in each gap between the fixed sinkers; and f) adjacent to the crimp head, the center of rotation of the crimp head. a disc-shaped cam having an eccentric rotation center and rotatably supported by a bracket; , the center point of which has a diameter equal to or larger than d+2e has an engagement hole provided concentrically with the center of rotation of the disc-top cam, and the engagement pin of the crimping head rotation is transmitted in the same direction as the crimping head; (ii) a groove in which the other end of the movable sinker fits is provided on a side surface concentrically with the center of rotation of the disc-shaped cam; and (h) the crimping - By rotating the bed via the drive shaft and fitting the other end of the movable sinker into the groove of the disc-shaped cam, the movable sinker in the eccentric direction of the disc-shaped cam is brought into a closed state, and the eccentric The movable sinker in the opposite direction is opened, and the closing and opening positions of the movable sinker are kept constant even while the crimping head is rotating, and the movable sinker is attached to the fitting portion between the fixed sinker and the movable sinker. This method is characterized by running the yarn and crimping it.
以下、図によって本発明を具体的に説明する。Hereinafter, the present invention will be specifically explained with reference to the drawings.
第１図は、本発明の糸捲縮装置を用いて糸に捲縮を施す
装置の一例を示す概略構成図である。FIG. 1 is a schematic configuration diagram showing an example of a device for crimping yarn using the yarn crimping device of the present invention.
第１図においては、パッケージ２１より引き出した未延
伸または半延伸の熱可塑性合成繊維よりなる糸２２を、
フィードローラ２３によって一定速度で供給し、ヒータ
２４で加熱後、糸捲縮装置１によって延伸および捲縮を
施し、巻糸パッケージ２５のように巻き取る。In FIG. 1, a thread 22 made of undrawn or semi-drawn thermoplastic synthetic fibers pulled out from a package 21 is
The yarn is fed at a constant speed by a feed roller 23, heated by a heater 24, stretched and crimped by a yarn crimping device 1, and wound up into a yarn package 25.
第２図は、本発明の一実施例よりなる糸捲縮装置１の一
部切断斜視図である。FIG. 2 is a partially cutaway perspective view of the yarn crimping device 1 according to an embodiment of the present invention.
第２図に示すように、捲縮ヘッド２に、円形列状に互い
に空隙をはさんだ複数の固定シンカ３と、この固定シン
カ３間の各空隙に位置する複数の可動シンカ４が設けら
れている。As shown in FIG. 2, the crimping head 2 is provided with a plurality of fixed sinkers 3 arranged in a circular row with gaps between them, and a plurality of movable sinkers 4 located in each gap between the fixed sinkers 3. There is.
Ａ位置においては、可動シンカ４の一端は固定シンカ３
間の空隙から離隔した開放位置にあり、Ｃ位置において
は、可動シンカ４の一端が固定シンカ３間の空隙に嵌合
した閉鎖位置にある。At position A, one end of the movable sinker 4 is connected to the fixed sinker 3.
In the C position, one end of the movable sinker 4 is in a closed position in which one end of the movable sinker 4 is fitted into the gap between the fixed sinkers 3.
Ａ位置とＣ位置との中間にあるＢ位置においては、前記
の嵌合が始まりかけている。At the B position, which is between the A position and the C position, the above-mentioned fitting is about to begin.
可動シンカ４は、リング状バネ８に押えられた箇所を支
点にして、前記の開放・閉鎖の各運動を行なう。The movable sinker 4 performs the above-mentioned opening and closing movements using the portion pressed by the ring-shaped spring 8 as a fulcrum.
この可動シンカ４の他端は、円板状カム６の溝７に嵌合
している。The other end of the movable sinker 4 is fitted into a groove 7 of a disc-shaped cam 6.
円板状カム６は、捲縮ヘッド２を回転させる駆動軸５の
回転中心から偏心した回転中心を有し、捲縮ヘッド２に
面した側面に、円板状カム６の回転中上表同心円状に穿
設された前記の溝７を有している。The disc-shaped cam 6 has a rotation center eccentric from the rotation center of the drive shaft 5 that rotates the crimping head 2, and has a concentric circle on the upper surface during rotation of the disc-shaped cam 6 on the side facing the crimping head 2. The groove 7 has the above-mentioned groove 7 bored in a shape.
第３図は、本発明の一実施例よりなる糸捲縮装置１の断
面図である。FIG. 3 is a sectional view of a yarn crimping device 1 according to an embodiment of the present invention.
第３図に示すように、駆動軸５は軸受９を介してフレー
ム１０に軸承され、植込みキー１１を介して駆動円板１
２が駆動軸５に一体化されている。As shown in FIG. 3, the drive shaft 5 is supported on a frame 10 via a bearing 9, and the drive disc 1
2 is integrated into the drive shaft 5.
駆動円板１２および捲縮ヘッド２の各係合穴１３．１４
を貫通する握り１５の係合ピン１６を介して、捲縮ヘッ
ド２に駆動軸５の回転が伝えられる。Engagement holes 13, 14 in drive disk 12 and crimping head 2
The rotation of the drive shaft 5 is transmitted to the crimping head 2 via the engagement pin 16 of the grip 15 that passes through the crimping head 2 .
さらに円板状カム６の係合穴１７に挿入、された捲縮ヘ
ッド２の係合ピン１６′を介して、円板状カム６は捲縮
ヘッド２と同一方向に回転させられる。Furthermore, the disc-shaped cam 6 is rotated in the same direction as the crimp head 2 through the engagement pin 16' of the crimp head 2 inserted into the engagement hole 17 of the disc-shaped cam 6.
この円板状カム６は、軸受９′を介してブラケット１８
に軸承されており、ブラケット１８はフレーム１０に固
定されている。This disc-shaped cam 6 is connected to a bracket 18 via a bearing 9'.
The bracket 18 is fixed to the frame 10.
糸掛は時には握り１５を一部列いて、係合ピン１６を駆
動円板１２の係合穴１３からは外し、捲縮ヘッド２の係
合穴１４には挿入したままにすれば、捲縮ヘッド２およ
び円板状カム６は、駆動軸５の回転とは切り離されるの
で、糸掛けを手動で行なうことができる。When threading, sometimes the grip 15 is partially lined up and the engagement pin 16 is removed from the engagement hole 13 of the drive disk 12 but remains inserted into the engagement hole 14 of the crimping head 2, and the crimping is done. Since the head 2 and the disc-shaped cam 6 are separated from the rotation of the drive shaft 5, threading can be carried out manually.
糸掛は時以外は、握り１５はコイルばね１９によって捲
縮ヘッド２に押えつけられているので、捲縮ヘッド２は
駆動軸５と一体的に回転する。Since the grip 15 is pressed against the crimping head 2 by the coil spring 19 except when threading, the crimping head 2 rotates integrally with the drive shaft 5.
第４図イは、第３図のＺ−Ｚ矢視断面図である。FIG. 4A is a sectional view taken along the Z-Z arrow in FIG. 3.
第４図イに示すように、円板状カム６の回転中心すは、
駆動軸５の回転中心ａより偏心長さｅだけ偏心させられ
ている。As shown in FIG. 4A, the rotation center of the disc-shaped cam 6 is
The drive shaft 5 is eccentric from the rotation center a by an eccentric length e.
捲縮ヘッド２の係合ピン１６′は１駆動軸５の回転中心
ａに対し、また円板状カム６の保合穴１７は円板状カム
６の回転中心すに対し、それぞれ等距離になるように設
けられることが好ましい。The engagement pin 16' of the crimping head 2 is equidistant from the rotation center a of the drive shaft 5, and the retaining hole 17 of the disc-shaped cam 6 is equidistant from the rotation center a of the disc-shaped cam 6. It is preferable to provide such a configuration.
また、係合穴１７の直径りは、係合ピン１６′の直径ｄ
および偏心長さｅに対し、Ｄ−ｄ＋２ｅとなるように選
べば、円板状カム６の回転は駆動軸５の回転すなわち捲
縮ヘッド２の回転と完全に同期するので、好ましい。The diameter of the engagement hole 17 is the diameter d of the engagement pin 16'.
It is preferable that the rotation of the disc-shaped cam 6 is completely synchronized with the rotation of the drive shaft 5, that is, the rotation of the crimping head 2, if the eccentricity length e is selected to be D-d+2e.
係合穴１７の直径りがｄ ＋ ２ ｅより犬であっても
円板状カム６の回転は駆動軸５の回転すなわち捲縮ヘッ
ド２の回転と同期に近い回転を行なう。Even if the diameter of the engagement hole 17 is smaller than d + 2 e, the rotation of the disc-shaped cam 6 is nearly synchronous with the rotation of the drive shaft 5, that is, the rotation of the crimping head 2.
しかしながら、Ｄくｄ＋２ｅであれば回転不可能となる
。However, if D×d+2e, rotation becomes impossible.
第２図〜第４図に示す装置においては、１駆動軸５に対
して円板状カム６は下側に偏心しており、上記の条件に
より、係合ピン１６′が係合穴１７に接触しつつ捲縮ヘ
ッド２の回転を円板状カム６に伝えるので、ピン１６′
が倒れの位置にあろうと、第４図口こ示す如く、常に可
動シンカ４はＡの位置において開放の状態にあり、Ｃの
位置において閉鎖の状態にあり、開放位置と閉鎖位置と
がそれぞれ一定位置に保たれている。In the device shown in FIGS. 2 to 4, the disc-shaped cam 6 is eccentric downward with respect to the drive shaft 5, and under the above conditions, the engagement pin 16' comes into contact with the engagement hole 17. Since the rotation of the crimping head 2 is transmitted to the disc-shaped cam 6 while
Even if the sinker 4 is in the reclined position, as shown in Figure 4, the movable sinker 4 is always open at position A and closed at position C, and the open and closed positions are constant. kept in position.
なお、第４図には四箇所に係合穴１７を設けた場合を示
したが、あるいは三箇所であってもよい。Although FIG. 4 shows a case where the engagement holes 17 are provided at four locations, the engagement holes 17 may be provided at three locations.
要するに、捲縮ヘッド２の回転に対し、円板状カム６を
安定して同一方向に回転させ得る構造であればよい。In short, any structure that can stably rotate the disc-shaped cam 6 in the same direction as the crimping head 2 rotates may be used.
また、係合穴１７は貫通されたものでなく、凹状のもの
でもよい。Moreover, the engagement hole 17 may not be a penetrating hole but may be a concave hole.
本発明の糸捲縮装置は、上述のような構成を有するため
、次のような効果を発揮する。Since the yarn crimping device of the present invention has the above-described configuration, it exhibits the following effects.
（１）可動シンカの一端が固定シンカ間の空隙に位置し
、他端は円板状カムの溝に嵌合され、がっ、円板状カム
は捲縮ヘッドの回転中心から偏心した回転中心を有して
、捲縮ヘッドの回転と同一方向に回転するため、可動シ
ンカの開放位置および閉鎖位置がそれぞれ一定位置に定
められ、しかも、開放位置と閉鎖位置との互いの推移が
徐々に、かつ滑らかに行なわれる。(1) One end of the movable sinker is located in the gap between the fixed sinkers, and the other end is fitted into the groove of the disc-shaped cam, and the disc-shaped cam has a rotation center eccentric from the rotation center of the crimping head. Since the movable sinker rotates in the same direction as the crimping head, the open position and the closed position of the movable sinker are set at constant positions, and the transition between the open position and the closed position is gradual. And it's done smoothly.
したがって、この定まった開放位置より安定して糸を供
給し、定まった閉鎖位置より安定して糸を引き出すこと
ができる。Therefore, the thread can be stably supplied from the fixed open position, and the thread can be drawn out more stably from the fixed closed position.
しかも、可動シンカと固定シンカとの間で糸がすべるの
を防止でき、糸を十分に把持しながらその進向方向に対
し垂直に可動シンカを閉鎖させてゆくことになるので、
糸を延伸させながら微少ピンチで捲縮を施すことができ
る。Moreover, the yarn can be prevented from slipping between the movable sinker and the fixed sinker, and the movable sinker can be closed perpendicularly to the direction in which the yarn is traveling while fully grasping the yarn.
Crimp can be applied with a slight pinch while stretching the yarn.
その結果、このようにして得られた捲縮糸は、その捲縮
状態を長期間維持することができる。As a result, the crimped yarn thus obtained can maintain its crimped state for a long period of time.
（２）円板状カムを捲縮ヘッドと同一方向に、かつ、好
ましくは同一回転数で回転させるので、可動シンカと円
板状カムとの間のすべりが小さく押えられ、高速回転を
容易に行なうことができる。(2) Since the disc-shaped cam is rotated in the same direction as the crimping head and preferably at the same rotation speed, slippage between the movable sinker and the disc-shaped cam is kept to a minimum, making high-speed rotation easy. can be done.
さラニ、各一つの可動シンカと円板状カムとの間のすべ
りは、円板状カムの微少な一定角度内に押えられている
ため、潤滑を行ないやすく、高速回転に適する。The slippage between each movable sinker and the disc-shaped cam is suppressed within a small constant angle of the disc-shaped cam, making it easy to lubricate and suitable for high-speed rotation.
以上説明したように、本発明の糸捲縮装置は、高速かつ
微少ピッチで糸に捲縮を施すことを可能にした。As explained above, the yarn crimping device of the present invention makes it possible to crimp yarn at high speed and at minute pitches.
したがって、ノントルク加工糸分野の拡大には有効であ
り、特に高速捲縮加工糸分野には好適である。Therefore, it is effective for expanding the field of non-torque textured yarn, and is particularly suitable for the field of high-speed crimped yarn.
第１図は本発明の糸捲縮装置を用いて糸に捲縮を施す装
置の一例を示す概略構成図、第２図は本発明の一実施例
よりなる糸捲縮装置の一部切断斜視図、第３図はせの断
面図、第４図イは第３図のＺ−Ｚ矢視断面図であり、第
４図口は第４図イの位置から係合ピンが僅かに回転した
状態を示す図である。
１・・・・・・糸捲縮装置、２・・・・・・捲縮ヘッド
、３・・・・・・固定シンカ、４・・・・・・可動シン
カ、５・・・・・・駆動軸、６・・・・・・円板状カム
、７・・・・・・溝、８・・・・・・リング状ばね、１
６ 、１６’・・・・・・係合ピン、１７・・曲係合穴
、１８・・・・・・ブラケット。FIG. 1 is a schematic configuration diagram showing an example of a device for crimping yarn using a yarn crimping device of the present invention, and FIG. 2 is a partially cutaway perspective view of a yarn crimping device according to an embodiment of the present invention. Fig. 3 is a sectional view of the stem, and Fig. 4 A is a sectional view taken along the Z-Z arrow in Fig. 3. It is a figure showing a state. 1... Yarn crimping device, 2... Crimping head, 3... Fixed sinker, 4... Movable sinker, 5... Drive shaft, 6...Disc-shaped cam, 7...Groove, 8...Ring-shaped spring, 1
6, 16'...Engagement pin, 17...Curved engagement hole, 18...Bracket.
Claims (1)
心円上に突出せしめられ、直径がｄなる複数本の係合ピ
ンと、 二）該捲縮ヘッドの外周に円形列状に互いに空隙をはさ
んで取付けられた複数の固定シンカと、ホ）該固定シン
カの側面に取付けられ、一端が上記固定シンカ間の各空
隙に位置する複数の可動シンカと、 へ）前記捲縮ヘッドに隣接し、前記捲縮ヘッドの回転中
心から偏心した回転中心を有してブラケットにより回転
自在に支承される円板状カムとからなり、 ト）該円板状カムは、 （ｉ） 側面に前記捲縮ヘッドの係合ピンと係合し、
直径りがｄ＋２ｅと等しいか、またはそれよりも犬であ
る中心点が該円板上カムの回転中心と同心円状に設けら
れた係合穴を有し、前記捲縮ヘッドの係合ピンによって
前記捲縮ヘッドと同一方向に回転伝達せしめられ、 （１１）側面に前記可動シンカの他端が嵌合する溝が該
円板状カムの回転中心と同心円状に設けられ、 チ）前記捲縮ヘッドを駆動軸を介して回転させ、前記円
板状カムの溝に前記可動シンカの他端を嵌合させること
によって、前記円板状カムの偏心方向にある可動シンカ
を閉鎖状態に、偏心方向と反対の方向にある可動シンカ
を開放状態にし、前記捲縮ヘッドが回転中にも前記可動
シンカの閉鎖、開放の位置を一定に保ちつつ、前記固定
シンカと可動シンカとの嵌合部に糸を走行させて捲縮を
施すことを特徴とする糸捲縮装置。[Scope of Claims] 1) a drive shaft; 9) a crimp head rotatably attached to the drive shaft; a plurality of engaging pins that protrude and have a diameter of d; 2) a plurality of fixed sinkers attached to the outer periphery of the crimping head in a circular row with gaps between each other; and e) a side surface of the fixed sinker. a plurality of movable sinkers attached to the crimping head, one end of which is located in each gap between the fixed sinkers; g) the disc-shaped cam is rotatably supported;
The center point of which diameter is equal to or larger than d+2e has an engaging hole provided concentrically with the center of rotation of the disk-top cam, and the engaging pin of the crimping head rotation is transmitted in the same direction as the crimping head; (11) a groove into which the other end of the movable sinker fits is provided on a side surface concentrically with the center of rotation of the disc-shaped cam; and (h) the crimping head is rotated through a drive shaft and the other end of the movable sinker is fitted into the groove of the disc-shaped cam, thereby bringing the movable sinker in the eccentric direction of the disc-shaped cam into a closed state. The movable sinker in the opposite direction is opened, and while the crimping head is rotating, the closing and opening positions of the movable sinker are kept constant, and the thread is inserted into the fitting part between the fixed sinker and the movable sinker. A yarn crimping device characterized by running and crimping.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14804677A JPS5933686B2 (en) | 1977-12-12 | 1977-12-12 | Yarn crimping device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14804677A JPS5933686B2 (en) | 1977-12-12 | 1977-12-12 | Yarn crimping device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5482462A JPS5482462A (en) | 1979-06-30 |
| JPS5933686B2 true JPS5933686B2 (en) | 1984-08-17 |
Family
ID=15443920
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14804677A Expired JPS5933686B2 (en) | 1977-12-12 | 1977-12-12 | Yarn crimping device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5933686B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH023679U (en) * | 1988-06-20 | 1990-01-11 | ||
| JPH0578915B2 (en) * | 1985-04-29 | 1993-10-29 | Du Pont |
-
1977
- 1977-12-12 JP JP14804677A patent/JPS5933686B2/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0578915B2 (en) * | 1985-04-29 | 1993-10-29 | Du Pont | |
| JPH023679U (en) * | 1988-06-20 | 1990-01-11 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5482462A (en) | 1979-06-30 |
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