JPH053071B2 - - Google Patents
Info
- Publication number
- JPH053071B2 JPH053071B2 JP16048887A JP16048887A JPH053071B2 JP H053071 B2 JPH053071 B2 JP H053071B2 JP 16048887 A JP16048887 A JP 16048887A JP 16048887 A JP16048887 A JP 16048887A JP H053071 B2 JPH053071 B2 JP H053071B2
- Authority
- JP
- Japan
- Prior art keywords
- hub
- lower flange
- flange
- groove
- wall
- 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 - Lifetime
Links
- 230000002093 peripheral effect Effects 0.000 description 5
- 230000002950 deficient Effects 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 210000000078 claw Anatomy 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 229910052573 porcelain Inorganic materials 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Landscapes
- Storage Of Web-Like Or Filamentary Materials (AREA)
Description
〔発明の目的〕
（産業上の利用分野）
この発明は、主にVTRのカセツトケース内に
組込まれているテープリールに関する。
（従来の技術）
周知の如くVTRのカセツトケース内に組込ま
れているテープリールは、第３図の如くハブ２の
片側に下フランジ５を有するリール本体１と、ハ
ブ２の反対側に取付ける上フランジ８、及びハブ
外周の幅方向に設けたクランプ穴３に嵌合係止す
るクランプピース９より構成され、リール本体１
のハブ内より幅方向に開口するハブ孔４を設け、
ハブ孔の内周面にハブ爪１４を等間隔に突設し、
ハブ孔口縁壁４ａより外側の下フランジ下面５ａ
にカセツトケース内に載置する支持壁６を設け、
下フランジ５の外周に歯１５を有するものであ
る。このリール本体１を合成樹脂で形成すると、
径方向に肉厚が一様でないため熱収縮等により変
形が生じる。特にハブ２より外周に突出する下フ
ランジ幅ｌは録音時間の長短、即ち磁器テープの
巻取量に応じて広くなり、長時間用テープリール
の下フランジにあつては32mmにも達するため、フ
ランジに内外方向の反り変形が生じた。下フラン
ジ５がテープ巻取側の内側に反り、上下フランジ
間がテープ幅より狭くなると、テープが幅方向に
彎曲状態で巻取られたり巻戻されるため、テープ
の録画や録音、記憶に悪影響を与えるし、反対に
フランジが外側に反るえと、カセツトに触れて回
転ムラを生じる等の不都合があるので、反り変形
の大きいリールは不良品とされていた。
（発明が解決しようとする問題点）
フランジの反りを許容値以内にする手段とし
て、金型の対する溶融樹脂の充填速度と充填温
度、金型の温度、及び成形品の射出時間等の調整
にて行われていたが、これらの調整には高度の熟
練を要するし、調整しても不良品が20％程度も発
生するばかりか、外気温度の昇降によつても反り
が変形するため、その都度、再調整しなければな
らない面倒があつた。
〔発明の構成〕
（問題点を解決するための手段）
出願人は先にテープリールにおけるフランジの
反り防止手段として、特開昭60−246072号の如く
下フランジに放射方向の補強リブを設けると共
に、リブを避けた位置に貫通孔を穿設する発明を
成し、更にその改良を続けて本発明に至つたもの
で、本発明はリール本体の口縁壁より外周の下フ
ランジ基部に支持壁を設け、口縁壁と支持壁の間
に生じる溝をハブとフランジに跨がるようにし、
且つ溝底を溝幅方向に傾斜して、熱収縮等による
フランジの反りを調整するものである。
（作用）
支持壁がハブ口縁壁より外周の下フランジ基部
に設けられ、口縁壁と支持壁の間に生じる溝がハ
ブとフランジに跨がり、溝底が溝幅方向に傾斜し
ているため、溝底の傾斜角を調整して肉厚を変形
し、偏肉による熱収縮差を利用して下フランジの
反りを修正することができる。
（実施例）
以下、本発明によるテープリールの構造を実施
例の図面に基づき説明すると、リール本体１は従
来と基本的に同じで、ハブ２は下向きにハブ孔４
を形成する軸受部１２の外側に、磁器テープ巻取
用のハブ外周壁２２を設け、外周壁２２の一箇所
に幅方向のクランプ穴３を、又軸受部１２の端面
２ａより上方に数個の突起１３を形成し、ハブ孔
４の内周面に数条のハブ爪１４を等間隔に設け、
ハブ孔４の口縁壁４ａより外側に支持壁６を突設
し、フランジ５の外周部に歯１５を有する。本発
明の特徴は支持壁６を口縁壁４ａより僅かに下方
へ突出するよう、且つ口縁壁４ａより外側の下フ
ランジ基部に設け、支持壁６と口縁壁４ａの間に
生じる溝７を、ハブ２とフランジ５に跨がり、し
かもハブ外周壁２２と対称に開口し得るようにす
ると共に、溝深さＨを支持壁６の突出高さｈより
深くし、溝底７ａを外周又は内周に向けて傾斜角
５〜20度の範囲で下降傾斜する。リール本体１の
ハブ２に取付ける上フランジ８は従来と同様に、
中央部にハブ軸受部１２の端面２ａより突出する
突起１３の挿入孔１８を設け、挿入孔１８より突
出した突起１３の先部を押潰し、下フランジ５と
相対するように固定する。ハブ２のクランプ穴３
に嵌合係止するクランプピース９は従来と同様
に、ピース９の表面９ａがハブ外周壁２２と同一
曲率を成し、ピース９の裏側にクランプ穴３と弾
力的に係止する脚片１９を有している。
本発明テープリールのリール本体１は上記構造
であるから、リール本体１に合せて雄金型Ｄを形
成する際、リール本体１の溝７を形成する雄金型
Ｄの凸条部端面ｄを最も傾斜角θの少ない５度に
しておき、該雄金型Ｄを用いてリール本体１を試
作し、その下フランジ５の反りを外周に沿つて測
定し、反り値に応じて凸条部端面ｄを削り、溝底
７ａの傾斜角θを増大しつつ試作を繰返し、下フ
ランジ５の反りを許容値以内までにする。
実験例 １
120分録画用の従来リール本体を支持壁外径r1
……30φ、支持壁内径r2……26.9φ、溝幅ｌ……
2.4mm、フランジ径R1……89φ、ハブ径R2……
26φ、フランジ幅ｌ……31.5mm、溝深さＨ……1.8
mmにして成形し、その下フランジ５の反りを外周
に沿つて測定した所、磁気テープを巻き付ける内
側方向への反り（＋）と、外側への反り（−）が
第１表の如く測定された。
[Object of the Invention] (Industrial Application Field) The present invention mainly relates to a tape reel incorporated in a cassette case of a VTR. (Prior Art) As is well known, the tape reel incorporated in the cassette case of a VTR consists of a reel body 1 having a lower flange 5 on one side of the hub 2, and an upper flange attached to the opposite side of the hub 2, as shown in FIG. The reel body 1 is composed of a flange 8 and a clamp piece 9 that fits and locks into a clamp hole 3 provided in the width direction of the outer circumference of the hub.
A hub hole 4 is provided that opens in the width direction from the inside of the hub,
Hub claws 14 are provided protrudingly at equal intervals on the inner peripheral surface of the hub hole,
Lower flange lower surface 5a outside the hub hole edge wall 4a
A support wall 6 is provided to be placed inside the cassette case,
The lower flange 5 has teeth 15 on its outer periphery. When this reel body 1 is made of synthetic resin,
Since the wall thickness is not uniform in the radial direction, deformation occurs due to heat shrinkage, etc. In particular, the width l of the lower flange that protrudes from the hub 2 to the outer periphery increases depending on the length of the recording time, that is, the amount of winding of the porcelain tape. Warping deformation occurred in the medial and medial directions. If the lower flange 5 warps inward on the tape winding side and the space between the upper and lower flanges becomes narrower than the tape width, the tape will be wound and rewound in a curved state in the width direction, which will have a negative impact on tape recording, recording, and memory. On the other hand, reels with large warping deformations were considered to be defective because the flanges warped outward and came into contact with the cassette, causing uneven rotation. (Problems to be Solved by the Invention) As a means of keeping the warpage of the flange within the allowable value, it is necessary to adjust the filling speed and filling temperature of the molten resin into the mold, the temperature of the mold, the injection time of the molded product, etc. However, these adjustments require a high level of skill, and even after adjustment, about 20% of the products are defective, and the warpage deforms as the outside temperature rises and falls. It was a hassle to have to readjust it every time. [Structure of the Invention] (Means for Solving the Problems) The applicant previously provided a reinforcing rib in the radial direction on the lower flange as in JP-A No. 60-246072 as a means to prevent the flange of a tape reel from warping. , an invention was made in which a through hole is bored at a position avoiding the ribs, and further improvements were made to arrive at the present invention.The present invention has a support wall at the base of the lower flange of the outer periphery from the mouth wall of the reel body. , so that the groove created between the lip wall and the support wall spans the hub and flange,
Moreover, the groove bottom is inclined in the groove width direction to adjust the warpage of the flange due to heat shrinkage or the like. (Function) A support wall is provided at the base of the flange below the outer periphery of the hub edge wall, the groove formed between the edge wall and the support wall spans the hub and the flange, and the groove bottom is inclined in the groove width direction. Therefore, by adjusting the inclination angle of the groove bottom and changing the wall thickness, it is possible to correct the warpage of the lower flange by utilizing the difference in heat shrinkage due to uneven thickness. (Embodiment) Hereinafter, the structure of the tape reel according to the present invention will be explained based on the drawings of the embodiment.The reel body 1 is basically the same as the conventional one, and the hub 2 has a hub hole 4 facing downward.
A hub outer circumferential wall 22 for winding a magnetic tape is provided on the outside of the bearing portion 12 forming the porcelain tape, and a clamp hole 3 in the width direction is provided at one location in the outer circumferential wall 22, and several clamp holes are provided above the end surface 2a of the bearing portion 12. A projection 13 is formed, and several hub pawls 14 are provided at equal intervals on the inner peripheral surface of the hub hole 4.
A support wall 6 is provided to protrude outward from the mouth edge wall 4a of the hub hole 4, and the flange 5 has teeth 15 on its outer periphery. A feature of the present invention is that the support wall 6 is provided at the base of the lower flange on the outside of the mouth edge wall 4a so as to project slightly downward from the mouth edge wall 4a, and a groove 7 is formed between the support wall 6 and the mouth edge wall 4a. The groove straddles the hub 2 and the flange 5 and can be opened symmetrically with the hub outer peripheral wall 22, and the groove depth H is made deeper than the protruding height h of the support wall 6, and the groove bottom 7a is formed on the outer periphery or It slopes downward toward the inner circumference at an inclination angle of 5 to 20 degrees. The upper flange 8 attached to the hub 2 of the reel body 1 is the same as before.
An insertion hole 18 for a protrusion 13 protruding from the end surface 2a of the hub bearing part 12 is provided in the center, and the tip of the protrusion 13 protruding from the insertion hole 18 is crushed and fixed so as to face the lower flange 5. Clamp hole 3 of hub 2
The clamp piece 9 that fits and locks the clamp piece 9 has a surface 9a of the piece 9 having the same curvature as the hub outer peripheral wall 22, and a leg piece 19 that elastically locks the clamp hole 3 on the back side of the piece 9, as in the conventional case. have. Since the reel body 1 of the tape reel of the present invention has the above structure, when forming the male die D to match the reel body 1, the end surface d of the convex strip of the male die D that forms the groove 7 of the reel body 1 is The inclination angle θ is set to 5 degrees, which is the smallest, and the reel body 1 is prototyped using the male mold D. The warpage of the lower flange 5 is measured along the outer circumference, and the end face of the convex strip is determined according to the warpage value. d and repeating the trial production while increasing the inclination angle θ of the groove bottom 7a to bring the warpage of the lower flange 5 within the allowable value. Experimental example 1 Conventional reel body for 120 minutes recording with supporting wall outer diameter r 1
...30φ, support wall inner diameter r 2 ...26.9φ, groove width l...
2.4mm, flange diameter R 1 ...89φ, hub diameter R 2 ...
26φ, flange width l...31.5mm, groove depth H...1.8
mm, and the warpage of the lower flange 5 was measured along the outer periphery, and the warpage (+) towards the inside where the magnetic tape was wound and the warpage (-) towards the outside were measured as shown in Table 1. Ta.
【表】【table】
【表】
実験例 ２
実験例１と同じ従来リール本体において溝深さ
Ｈのみを2.2mmにして成形し、その下フランジ５
の反りを外周に沿つて測定した所、第２表の如く
反り値が得られた。[Table] Experimental Example 2 The same conventional reel body as Experimental Example 1 was molded with only the groove depth H of 2.2 mm, and the lower flange 5 was molded.
When the warpage was measured along the outer periphery, the warpage values as shown in Table 2 were obtained.
【表】
実験例１と２を比較した場合、実験例１の下フ
ランジ５は（−）側に反りやすく、実験例２の下
フランジ５は（＋）側に反りやすいことが理解出
来る。即ち溝深さＨを深くし溝底７ａの肉厚を薄
くする程、下フランジ５は（＋）側に反ることが
理解出来る。
実験例 ３
上記実験例１、２に基づき、従来リール本体の
溝深さＨを、両実験の中間値である2.0mmにして
成形し、その下フランジ５の反りを外周に沿つて
測定した所、第３表の如く反り値が得られた。[Table] When comparing Experimental Examples 1 and 2, it can be seen that the lower flange 5 of Experimental Example 1 tends to warp to the (-) side, and the lower flange 5 of Experimental Example 2 tends to warp to the (+) side. That is, it can be understood that the deeper the groove depth H and the thinner the wall thickness of the groove bottom 7a, the more the lower flange 5 warps toward the (+) side. Experimental Example 3 Based on Experimental Examples 1 and 2 above, the groove depth H of the conventional reel body was set to 2.0 mm, which is the intermediate value of both experiments, and the warpage of the lower flange 5 was measured along the outer periphery. , warpage values were obtained as shown in Table 3.
【表】
実験例３において、リール本体の下フランジ５
は（＋）方向と（−）方向に略均衡して反る傾向
を示したが、前記実験例１、２より反りにバラツ
キがあり、（＋）方向と（−）方向への反り差に
減少はみられなかつた。
実験例 ４
本発明によるテープリールのリール本体１を、
前記実験例１、２、３と同じ120分録画用リール
本体１の成形において、しかも支持壁外径r1……
30φ、支持壁内径r2……26.9φ、フランジ径R1…
…89φ、ハブ径R2……26φ、フランジ幅ｌ……
31.5mm、溝幅ｅ……2.4mmを同じ寸法にし、口縁
壁４ａと支持壁６の間に生ずる溝底７ａの傾斜角
θ、即ち雄金型凸条部端面ｄの傾斜角θを11度に
し、溝深さＨを内周側で1.85mm、外周側で2.25mm
となるようにして成形し、その下フランジ５の反
りを外周に沿つて測定した所、第４表の如く反り
値が得られた。[Table] In Experimental Example 3, the lower flange 5 of the reel body
showed a tendency to warp almost evenly in the (+) and (-) directions, but as shown in Experimental Examples 1 and 2 above, there was variation in the warp, and the difference in warp in the (+) and (-) directions. No decrease was observed. Experimental Example 4 The reel body 1 of the tape reel according to the present invention was
In the same molding of the reel body 1 for 120 minute recording as in Experimental Examples 1, 2, and 3, the outer diameter of the support wall r 1 ...
30φ, support wall inner diameter r 2 …26.9φ, flange diameter R 1 …
...89φ, hub diameter R 2 ...26φ, flange width l...
31.5 mm, groove width e...2.4 mm are the same dimensions, and the inclination angle θ of the groove bottom 7a that occurs between the mouth edge wall 4a and the support wall 6, that is, the inclination angle θ of the end surface d of the male mold convex strip, is set to 11. The groove depth H is 1.85mm on the inner circumference and 2.25mm on the outer circumference.
When the lower flange 5 was molded in such a manner that the warp was measured along the outer periphery, the warp values as shown in Table 4 were obtained.
【表】【table】
従つて本発明によるテープリールのリール本体
は、リール本体の溝を成形する雄金型の凸条部端
面を傾斜しておき、下フランジの反りに合せて凸
条部端面を削り、その傾斜角を変更し、ハブ孔口
縁壁と支持壁間の溝底の傾斜角を調整して、下フ
ランジの反りを少なくしたものであるから、即ち
金型によつて下フランジの反りを少なくしてある
ため、以後、外気温や樹脂の充填速度等が多少変
化しても、下フランジの反りは許容値内に納ま
り、寸法の安定したリール本体が得られる。しか
も樹脂の充填速度や充填温度、或は金型温度等を
僅かに調整すれば、高精度のリール本体を提供し
得るばかりか、その調整も至つて簡単容易であ
る。又本発明は雄金型を僅かに改良するだけで実
施できて、しかもテープリールの組立も従来通り
に成し得るばかりか、下フランジの反り差が従来
リールに比較して半減するし、下フランジの反り
による不良品率、即ちリール本体の歩止まりも著
しく向上する等、本発明は高精度化するVTR用
のテープリールやオーデイオ用テープリールとし
て、実用面に有益な効果を奏するものである。
Therefore, in the reel body of the tape reel according to the present invention, the end face of the convex part of the male mold for forming the groove of the reel body is inclined, and the end face of the convex part is shaved in accordance with the warp of the lower flange, and the inclination angle is adjusted. By changing the angle of inclination of the bottom of the groove between the hub hole edge wall and the support wall, the warpage of the lower flange was reduced.In other words, the warpage of the lower flange was reduced by the mold. Therefore, even if the outside temperature, the resin filling speed, etc. change somewhat from now on, the warpage of the lower flange will be within the allowable value, and a reel body with stable dimensions can be obtained. Moreover, by slightly adjusting the resin filling speed, filling temperature, mold temperature, etc., not only can a highly accurate reel body be provided, but the adjustment is also extremely simple. In addition, the present invention can be carried out by only slightly improving the male mold, and the tape reel can be assembled in the same way as before.The difference in warpage of the lower flange is halved compared to the conventional reel, and the lower The present invention has practical effects that are useful as tape reels for VTRs and audio tape reels with higher precision, such as significantly improving the defective product rate due to flange warping, that is, the yield of reel bodies. .
第１図は本発明によるテープリールの縦断面
図、第２図はその底面図、第３図は従来テープリ
ールの分解断面図、第４図はリール本体の平面
図、第５図は従来リール本体の溝成形例を示す要
部拡大断面図、第６図と第７図は本発明リール本
体の溝成形例を示す要部拡大断面図、第８図は雄
金型の要部断面図である。
１……リール本体、２……ハブ、３……クラン
プ穴、１２……軸受部、２２……外周壁、４……
ハブ孔、１４……ハブ爪、４ａ……口縁壁、５…
…下フランジ、１５……歯、６……支持壁、７…
…溝、７ａ……溝底、８……上フランジ、９……
クランプピース、Ｄ……雄金型、ｄ……凸条部端
面、ｌ……フランジ幅、Ｈ……溝深さ、ｈ……支
持壁の突出高さ、θ……溝底と凸条部端面の傾斜
角。
Fig. 1 is a longitudinal sectional view of a tape reel according to the present invention, Fig. 2 is a bottom view thereof, Fig. 3 is an exploded sectional view of a conventional tape reel, Fig. 4 is a plan view of the reel body, and Fig. 5 is a conventional reel. FIGS. 6 and 7 are enlarged sectional views of essential parts showing examples of groove forming on the reel body of the present invention, and FIG. 8 is a sectional view of essential parts of a male mold. be. DESCRIPTION OF SYMBOLS 1... Reel body, 2... Hub, 3... Clamp hole, 12... Bearing part, 22... Outer peripheral wall, 4...
Hub hole, 14... Hub claw, 4a... Mouth wall, 5...
...lower flange, 15...teeth, 6...support wall, 7...
...groove, 7a...groove bottom, 8...upper flange, 9...
Clamp piece, D...Male mold, d...End face of protruding part, l...Flange width, H...Groove depth, h...Protrusion height of support wall, θ...Groove bottom and protruding part The angle of inclination of the end face.
Claims (1)
本体１と、ハブの他端に下フランジと相対設する
上フランジ８、及びハブの幅方向に設けたクラン
プ穴３に嵌合係止するクランプピース９から成る
テープリールにおいて、リール本体の下フランジ
基部に、下向きに開口するハブ孔４の口縁壁４ａ
より僅かに高い支持壁６を設け、該支持壁６と口
縁壁４ａの間に生じる溝７を、ハブと下フランジ
に跨がるよう、且つ溝底７ａが溝幅方向に傾斜す
るようにし、溝底の傾斜にて下フランジの反りを
補正したテープリール。1. A reel body 1 having a lower flange 5 at one end of the hub 2, an upper flange 8 provided opposite the lower flange at the other end of the hub, and a clamp piece that fits and locks into a clamp hole 3 provided in the width direction of the hub. In the tape reel consisting of 9, the mouth edge wall 4a of the hub hole 4 that opens downward is provided at the base of the lower flange of the reel main body.
A slightly higher support wall 6 is provided, and the groove 7 formed between the support wall 6 and the mouth edge wall 4a is formed so as to span the hub and the lower flange, and the groove bottom 7a is inclined in the groove width direction. , a tape reel that corrects the warpage of the lower flange by using the slope of the groove bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16048887A JPS644991A (en) | 1987-06-26 | 1987-06-26 | Tape reel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16048887A JPS644991A (en) | 1987-06-26 | 1987-06-26 | Tape reel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS644991A JPS644991A (en) | 1989-01-10 |
| JPH053071B2 true JPH053071B2 (en) | 1993-01-13 |
Family
ID=15716020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16048887A Granted JPS644991A (en) | 1987-06-26 | 1987-06-26 | Tape reel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS644991A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5555787A (en) * | 1993-11-12 | 1996-09-17 | Recot, Inc. | Replaceable blade cartridge for a centrifugal type food slicer |
| WO2025052553A1 (en) * | 2023-09-05 | 2025-03-13 | 株式会社Fuji | Reel management device and reel management method |
-
1987
- 1987-06-26 JP JP16048887A patent/JPS644991A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS644991A (en) | 1989-01-10 |
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