JPS59112472A - Tape reel for video cassette - Google Patents
Tape reel for video cassetteInfo
- Publication number
- JPS59112472A JPS59112472A JP18919283A JP18919283A JPS59112472A JP S59112472 A JPS59112472 A JP S59112472A JP 18919283 A JP18919283 A JP 18919283A JP 18919283 A JP18919283 A JP 18919283A JP S59112472 A JPS59112472 A JP S59112472A
- Authority
- JP
- Japan
- Prior art keywords
- flange
- hub
- head
- tape reel
- gate
- 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.)
- Pending
Links
- 238000002347 injection Methods 0.000 claims abstract description 6
- 239000007924 injection Substances 0.000 claims abstract description 6
- 238000000465 moulding Methods 0.000 claims abstract description 6
- 238000003466 welding Methods 0.000 claims abstract description 4
- 239000011347 resin Substances 0.000 claims abstract description 3
- 229920005989 resin Polymers 0.000 claims abstract description 3
- 238000001746 injection moulding Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000008018 melting Effects 0.000 abstract 1
- 238000002844 melting Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000002950 deficient Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
- G11B23/02—Containers; Storing means both adapted to cooperate with the recording or reproducing means
- G11B23/04—Magazines; Cassettes for webs or filaments
- G11B23/08—Magazines; Cassettes for webs or filaments for housing webs or filaments having two distinct ends
- G11B23/087—Magazines; Cassettes for webs or filaments for housing webs or filaments having two distinct ends using two different reels or cores
- G11B23/08707—Details
- G11B23/08728—Reels or cores; positioning of the reels in the cassette
Abstract
Description
【発明の詳細な説明】
本発明は、ビデオカセット用テープリールの改良に関し
、殊にプラスチック製のこの種テープリールの射出成形
後にハブに残って問題となるゲート痕に対して配慮を施
したビデオカセット用テープリールに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a tape reel for video cassettes, and in particular to a video cassette tape reel that takes into account gate marks that remain on the hub after injection molding of this type of tape reel made of plastic. Regarding tape reels for cassettes.
昨今、ケーシング内に映像音声録再用の磁気テープを収
めたビデオカセットが録再機器の普及と共に大量に生産
されるようになっている。然して、ケーシング内でテー
プを巻付は保持しているテープリールは、各社で録再方
式に差があったり録再時間の長短により、大きさは様々
に異なるものの、プラスチック製であること、及び形態
上、略ぐ同一の基本構成を採ること等で共通している。2. Description of the Related Art Recently, video cassettes in which a magnetic tape for recording and reproducing video and audio is housed in a casing have been produced in large quantities as recording and reproducing equipment has become widespread. However, the tape reel that wraps and holds the tape inside the casing is made of plastic, although its size varies depending on the recording/playback method used by each company and the length of the recording/playback time. In terms of form, they have something in common in that they have almost the same basic configuration.
その−例を示すと第1〜3図に示すようになる。Examples of this are shown in FIGS. 1 to 3.
一般に、この種テープリールは一対のフランジIa 、
lbをハブ2で軸方向に離間的に連結して成り、一方
のフランジIbは予めハブ2に一体成形されるが他方の
フランジIaは別途成形された後、ハブ2の対応する端
部に載せられ、該端部に設けられている固定用突起4の
頭を超音波溶接により潰すことによって当該ハブ2に固
定される。勿論、ハブ2の外周面2aには図示していな
いが磁気テープが巻付けられる。Generally, this kind of tape reel has a pair of flanges Ia,
lb are connected at a distance in the axial direction by a hub 2, one flange Ib is integrally molded with the hub 2 in advance, but the other flange Ia is molded separately and then placed on the corresponding end of the hub 2. and is fixed to the hub 2 by crushing the head of the fixing protrusion 4 provided at the end by ultrasonic welding. Of course, a magnetic tape (not shown) is wound around the outer peripheral surface 2a of the hub 2.
第2図にこうしたハブ2の縦断面(第1,3図II −
TI線)を、第3図には横断面(第2図m−m線)を、
夫々拡大して説明すると、別体のフランジlaの載る方
のハブ端面には、カセットケーシング内の弾性片(図示
せず)にて押圧される中心軸」二の突起3と、該別体の
フランジIaを貫通した後、超音波溶接により頭を潰さ
れて仮想線4′のように変形することにより当該別体の
フランジを」二から押え込む固定用突起4が設けられて
いる。FIG. 2 shows a longitudinal section of such a hub 2 (FIGS. 1 and 3 II-
TI line), Fig. 3 shows the cross section (Fig. 2 line m-m),
To explain each in detail, on the end surface of the hub on which the separate flange la rests, there is a protrusion 3 on the central shaft 2 that is pressed by an elastic piece (not shown) in the cassette casing, and After penetrating the flange Ia, a fixing protrusion 4 is provided whose head is crushed by ultrasonic welding and deformed as shown by the imaginary line 4', thereby pressing down on the separate flange.
一方、ハブ2に固定のフランジ1bの底面からは、該フ
ランジに開口し、ハブ内部に掛けて中空の筒状空間が穿
たれ、この中に録再機器側の駆動軸乃至リール支持軸が
嵌入する。即ち、この一端にのみ開口した筒状空間は録
再機器側の支持軸の受容空間5となっている。On the other hand, from the bottom of the flange 1b fixed to the hub 2, a hollow cylindrical space is bored through the flange and hung inside the hub, into which the drive shaft or reel support shaft of the recording/playback device is fitted. do. That is, this cylindrical space that is open only at one end serves as a receiving space 5 for a support shaft on the recording/reproducing device side.
周知のように、こうした録再機器側の支持軸は、支持軸
受容空間5に突入する部分に半径方向外方に突出するリ
ブが周方向に適宜な間隔で設けられていて、これに対応
し、支持軸受容空間5の内壁面からも周方向適宜な間隔
で半径方向内方に突出し軸方向に亘るリブ6 、、、、
が設けられている。即ち、隣接するリブ間にできる相対
的な溝7のいづれか対応するものの中に、先掲の支持軸
側のリブが嵌入、係合して、該支持軸の回転をリールに
伝達したり、逆にリールの回転が支持軸に伝達されたり
するのである。As is well known, the support shaft of such a recording/playback device has ribs protruding outward in the radial direction at appropriate intervals in the circumferential direction in the portion that protrudes into the support shaft receiving space 5. , ribs 6 extending radially inward from the inner wall surface of the support shaft receiving space 5 at appropriate intervals in the circumferential direction and extending in the axial direction.
is provided. That is, the rib on the supporting shaft side fits into and engages with one of the relative grooves 7 formed between adjacent ribs, thereby transmitting the rotation of the supporting shaft to the reel and vice versa. The rotation of the reel is then transmitted to the support shaft.
一般にこうした構成に加え、ハブ外周面を画する部分を
外筒部分8、内部の支持軸受容空間を画する部分を内筒
部分9として二重の筒構造にし、両者を連結桟10.、
、、で結んでいるものが多い。これは、材料の節約ばか
りではなく、ハブの半径方向の肉厚が徒らに厚くなるの
を防ぎ、成形後の硬化時に硬化ムラによる歪が生じるの
を防ぐためである。Generally, in addition to this configuration, a double cylindrical structure is used, with the part that defines the outer peripheral surface of the hub being an outer cylinder part 8 and the part that defines the internal support shaft receiving space an inner cylinder part 9, and the two are connected by a connecting bar 10. ,
Many are connected with ,,. This is not only to save material, but also to prevent the wall thickness of the hub from becoming unnecessarily thick in the radial direction, and to prevent distortion due to uneven curing during curing after molding.
このような公知構成のテープリールにおいて、制度を要
求されるのは、中心突起3の位置、仕上げ、ハブ外周面
径、仕上げ、強度、録再機器側支持軸との係合リブの内
径、間隔、仕上げ、強度の均−性等が筆頭に挙げられる
が、同時に良く問題とされるのはこうした各部品を樹脂
により射出成形した際のゲートの痕跡、いわゆるゲート
痕Gの処理である。In a tape reel with such a known configuration, precision is required in the position and finish of the center protrusion 3, the diameter of the outer peripheral surface of the hub, finish, strength, and the inner diameter and spacing of the engagement rib with the support shaft on the recording/playback device side. The most important issues are the uniformity of finish, strength, etc., but at the same time, what is often considered a problem is the treatment of gate marks, so-called gate marks G, when these parts are injection molded using resin.
然るに、従来は、このゲート痕Gをできるだけ目立たな
い位置に、とのことから、最も普通に選ばれる位置とし
て、ハブの支持軸受容空間5の天井面の中心Pにこのゲ
ートを配するようにしていた(第2図)。然し、この位
置に設けたとしても、こうしたゲート痕Gは製品毎にか
なりバラ付き、結構大きな突起として残ることも多く、
程度によっては録再機器側の支持軸嵌入の障害となる場
合さえあった。これでは他の部分の精度を幾ら」二げて
も意味のないものとなってしまう。そのため、成形後に
良く管理して、残っているものに付いては取除く作業を
せねばならず、これは極めて望ましくないことであった
。However, conventionally, this gate mark G has been placed in a position that is as inconspicuous as possible, and therefore, this gate has been placed at the center P of the ceiling surface of the support shaft receiving space 5 of the hub as the most commonly selected position. (Figure 2). However, even if provided at this location, these gate marks G vary considerably from product to product, and often remain as quite large protrusions.
Depending on the degree, it may even become an obstacle to inserting the support shaft into the recording/playback device. In this case, no matter how much you increase the precision of other parts, it becomes meaningless. Therefore, after molding, it is necessary to carefully manage the material and remove any remaining material, which is extremely undesirable.
本発明はこの従来例の欠点に鑑みて為されたものである
。即ち、極めて高い精度が要求されるこの種ビデオカセ
ット用テープリールにおいて、精度的な問題は克服した
としても尚残る射出成形ゲート痕の問題を合理的に解決
せんとしたものである。The present invention has been made in view of the drawbacks of this conventional example. That is, in this type of tape reel for video cassettes, which requires extremely high precision, even if the precision problem has been overcome, the problem of injection molding gate marks still remains, which is an attempt to be rationally solved.
本発明は、このような目的に従い、第4図示のように、
ハブ2及びこれと一体に成形されるフランジ1bの射出
成形ゲートを、別体のフランジlaの固定用突起4の一
つの頭にもってくることを提案する。In accordance with such an object, the present invention has the following features as shown in FIG.
It is proposed that the injection molded gate of the hub 2 and the flange 1b integrally molded therewith be brought to the head of one of the fixing projections 4 of a separate flange la.
このようにすれば、第4図示のように、射出成形の結果
として、当該固定用突起4の頂部にゲート痕Gが大きな
突起状のものとして残ったとしても、上記した別体のフ
ランジ1aを固定するためにこの固定用突起4を潰して
しまうのであるから、当該ゲート痕Gは仮想線で示す潰
れた突起4′の一部となって吸収され、跡形も無く消失
することになる。従って当該ゲート痕Gを別途に取除く
ための作業はもとより不要となり、生産性は大きく向上
する。一般に、この種の固定用突起は周方向に適宜間隔
で複数個設けられるが、その内の一つにこうした本発明
を適用すれば良い。In this way, even if the gate mark G remains as a large protrusion on the top of the fixing protrusion 4 as a result of injection molding, as shown in the fourth figure, the above-mentioned separate flange 1a can be removed. Since this fixing protrusion 4 is crushed in order to fix it, the gate mark G becomes a part of the crushed protrusion 4' shown by the imaginary line and is absorbed and disappears without a trace. Therefore, a separate operation for removing the gate mark G is no longer necessary, and productivity is greatly improved. Generally, a plurality of fixing protrusions of this kind are provided at appropriate intervals in the circumferential direction, and the present invention may be applied to one of them.
このようにして、本発明によれば、ハブ及び一方のフラ
ンジの一体成形の結果として残ることが予想ごれるゲー
ト痕Gに就いては一切、これを考慮する必要がなくなり
、他の部分の精度を十分に出すことに成功したのにこの
ゲート痕Gのために製品全体が不良品となるという不合
理は根本的に解決することができる。尚、本発明を適用
する場合、併せて採用すると望ましい構成は、第5図の
横断面に示すように、内筒部分9の肉厚を周方向の各所
でできるだけ同じになるようにすることである。即ち、
第3図の従来例においては、内筒部分9の肉厚は、録再
機器側の支持軸に係合するリブ6 、、、、のある所9
aでかなり厚く、一方、溝7のある所9bでは相当薄く
なっている。そのため、ストレスがうまく分散しなかっ
たり、成形後の硬化時に硬化ムラを生じて製品精度に影
響を及ぼす等の問題が生ずることがあったからである。In this way, according to the present invention, there is no need to take into account the gate marks G that are expected to remain as a result of integral molding of the hub and one flange, and the accuracy of other parts is reduced. The unreasonableness that the entire product becomes defective due to this gate mark G even though the gate mark G has been successfully produced can be fundamentally solved. In addition, when applying the present invention, a desirable configuration to also adopt is to make the wall thickness of the inner cylinder portion 9 as uniform as possible at various locations in the circumferential direction, as shown in the cross section of FIG. be. That is,
In the conventional example shown in FIG. 3, the wall thickness of the inner cylinder portion 9 is determined by the thickness of the inner cylinder portion 9 where the ribs 6, .
It is quite thick at point a, while it is quite thin at point 9b where groove 7 is located. This is because problems such as stress not being well dispersed or uneven curing occurring during curing after molding may occur, affecting product precision.
従って、第5図示のように、リブ6の設けられる所にあ
っても、その背後を軸方向に一連に肉抜きしてスリット
11を形成し、当該リブのある所でもその肉厚が符号9
a’で示すように溝部分8bの肉厚と略C同じになるよ
うにするのが良いのである。尚、第3図及び第5図中に
おいて、符号13はテープ端末処理のための周知の切欠
きである。Therefore, as shown in FIG. 5, even where the rib 6 is provided, the slit 11 is formed by continuously cutting out the thickness behind the rib 6 in the axial direction.
As shown by a', it is preferable that the thickness of the groove portion 8b be approximately the same as C. Incidentally, in FIGS. 3 and 5, reference numeral 13 is a well-known notch for tape end processing.
ともかくも以上詳記のように、本発明によればただそれ
だけで製品全体を不良品としてしまう恐れのあったハブ
のゲート痕Gに就き、取除き作業等の一切の関連作業を
省略することができ、然も当該ゲート痕Gは製品組上が
り時には完全に消失しているため、生産能率、歩留まり
の向」二、ひいてはコスト低廉化を果たせるという極め
て合理的な結果を得ることができるIn any case, as detailed above, according to the present invention, it is possible to omit all related work such as removing the gate mark G on the hub, which could have caused the entire product to be defective. However, since the gate mark G completely disappears when the product is assembled, it is possible to obtain extremely rational results that improve production efficiency and yield, and ultimately reduce costs.
第1図は通常のビデオカセット用テープリールの一例の
側面図、第2図は第1図II −II線に沿う縦断面図
、第3図は第2図m−■線に沿う横断面図、第4図は本
発明の一実施例を適用した第2図同様の縦断面図、第5
図は第4図v−v線に沿う改変例の横断面図、である。
図中、 Ia 、 lbはフランジ、2はハブ、3は中
心突起、4は別体に成形されたフランジの固定用突起、
5は録再機器側の支持軸の受容空間、である。
出 願 人 株式会社 ニ
フ コ第4図
第5図
3
9/
a
171
L6
9& 7 ga゛
I L
第3図Fig. 1 is a side view of an example of a tape reel for a normal video cassette, Fig. 2 is a vertical cross-sectional view taken along line II-II in Fig. 1, and Fig. 3 is a cross-sectional view taken along line m-■ in Fig. 2. , FIG. 4 is a vertical cross-sectional view similar to FIG. 2 to which an embodiment of the present invention is applied, and FIG.
The figure is a cross-sectional view of the modified example taken along the line v--v in FIG. 4. In the figure, Ia and lb are flanges, 2 is a hub, 3 is a central projection, 4 is a separately molded flange fixing projection,
5 is a receiving space for the support shaft on the side of the recording/reproducing device. Applicant: Co., Ltd.
Figure 4 Figure 5 3 9/a 171 L6 9 & 7 ga゛IL Figure 3
Claims (1)
て連結し、内部に録再機器側の支持軸を受容する支持軸
受容空間を有するハブと、から成り、該ハブと上記一対
のフランジの一方とは一体に射出成形される一方で、該
一方のフランジに対向する他方のフランジは、このフラ
ンジに対応するハブ端部に設けられた中心突起を貫通さ
せると共に固定用突起を貫通させる別体に成形されたも
のであり、該貫通した固定用突起の頭を超音波溶接によ
って潰すことにより該別体に成形されたフランジを上記
対応するハブ端部に固定するプラスチック製ビデオカセ
ット用テープリールにおいて、 上記ハブ及びこれに一体に成形される一方のフランジの
成形用樹脂射出ゲートは、成形型内において上記固定用
突起の頭に配されることを特徴とするビデオカセット用
テープリール。[Scope of Claims] Consisting of a pair of flanges, and a hub that connects the pair of flanges at a distance in the axial direction, and has a support shaft receiving space therein for receiving a support shaft of a recording/reproducing device. The hub and one of the pair of flanges are integrally injection molded, while the other flange facing the one flange is fixed while passing through a central protrusion provided at the end of the hub corresponding to the flange. plastic that is molded as a separate body through which the fixing protrusion passes through, and the flange that is molded on the separate body is fixed to the corresponding hub end by crushing the head of the fixing protrusion that has passed through it by ultrasonic welding. A tape reel for a video cassette produced by a manufacturer, wherein the resin injection gate for molding the hub and one flange integrally molded thereto is disposed at the head of the fixing protrusion in the mold. tape reel.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18919283A JPS59112472A (en) | 1983-10-12 | 1983-10-12 | Tape reel for video cassette |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18919283A JPS59112472A (en) | 1983-10-12 | 1983-10-12 | Tape reel for video cassette |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15859478A Division JPS5587352A (en) | 1978-12-25 | 1978-12-25 | Tape reel for video cassette |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS59112472A true JPS59112472A (en) | 1984-06-28 |
Family
ID=16237049
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP18919283A Pending JPS59112472A (en) | 1983-10-12 | 1983-10-12 | Tape reel for video cassette |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS59112472A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0189257A2 (en) * | 1985-01-19 | 1986-07-30 | Sony Corporation | Tape cassette reel |
US4807826A (en) * | 1986-12-12 | 1989-02-28 | Sony Corporation | Tape reel for tape cassette |
-
1983
- 1983-10-12 JP JP18919283A patent/JPS59112472A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0189257A2 (en) * | 1985-01-19 | 1986-07-30 | Sony Corporation | Tape cassette reel |
US4747563A (en) * | 1985-01-19 | 1988-05-31 | Sony Corporation | Tape cassette reel |
US4807826A (en) * | 1986-12-12 | 1989-02-28 | Sony Corporation | Tape reel for tape cassette |
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