JPS624952Y2 - - Google Patents

Description

【考案の詳細な説明】 この考案は、磁気テープカートリツジの改良に
係り、より詳しくは、カートリツジ内のハブに対
し磁気テープの端部を係止固定するテープクラン
プ構造に特徴を有する磁気テープカートリツジに
関する。[Detailed description of the invention] This invention relates to an improvement of a magnetic tape cartridge, and more specifically, a magnetic tape cartridge characterized by a tape clamp structure that locks and fixes the end of the magnetic tape to a hub inside the cartridge. Regarding Toritsuji.

従来のこの種テープクランプ構造の一例を示す
と次のようなものがある。まず、第１図に示すよ
うにプラスチツク製ハブ１の外周面一部に凹所２
を形成するとともに、この凹所２の底部中央にピ
ース保持突部３を形成し、ウエブ板４の左右両端
に係合脚片５，５を形成したプラスチツク製のク
ランプピース６の前記係合脚片５，５を、前記凹
所２内のピース保持突部３の両側に磁気テープ７
の端部をはさんで圧入嵌合するものがある。これ
によれば、クランプピース６の圧入嵌合時に係合
脚片が大きく弾性変形されるため、嵌合後に、ク
ランプピース６のウエブ板４にハブ１の外周面と
曲率を異にする変形が残りやすい。このため、ハ
ブ１の外周面に磁気テープ７を巻回するとき巻き
不整を生ずる。またピース保持突部３は変形不能
なブロツク形態になつているので、係合脚片５を
凹所２内に挿入しにくいばかりか、挿入した後も
係合脚片５とピース保持突部３との係合度合が小
さくてテープクランプ力に問題がある。 An example of a conventional tape clamp structure of this type is as follows. First, as shown in FIG.
A piece holding protrusion 3 is formed at the center of the bottom of the recess 2, and engaging leg pieces 5 are formed at both left and right ends of the web plate 4. , 5, and a magnetic tape 7 on both sides of the piece holding protrusion 3 in the recess 2.
There are some that are press-fitted by sandwiching the ends of the. According to this, since the engaging leg piece is largely elastically deformed when the clamp piece 6 is press-fitted, a deformation that makes the curvature different from the outer circumferential surface of the hub 1 remains on the web plate 4 of the clamp piece 6 after the fitting. Cheap. For this reason, when the magnetic tape 7 is wound around the outer peripheral surface of the hub 1, uneven winding occurs. Furthermore, since the piece holding protrusion 3 is in the form of a block that cannot be deformed, it is not only difficult to insert the engaging leg piece 5 into the recess 2, but also the engagement leg piece 5 and the piece holding protrusion 3 are not easily inserted even after insertion. The degree of engagement is small and there is a problem with tape clamping force.

また、テープクランプ構造の他の従来例を示す
と、第２図および第３図に示すように、プラスチ
ツク製ハブ１に設けた凹所２の底部中央に、互い
に離間した１対の係合突片８，８を左右方向に弾
性変形自在に突設するとともに、凹所２の開口部
に抜止突片９，９を形成し、ウエブ板４の左右両
端に係合脚片５，５を有するクランプピース６の
前記係合脚片５，５を、前記凹所２内の抜止突片
９，９と係合突片８，８間に磁気テープ７の端部
をはさんで圧入嵌合するものがある。しかし、第
３図に示すものにおいては係合突片８が曲げ変形
しやすく、また第２図に示すものにおいては抜止
突片９および係合突片８の双方が曲げ変形しやす
いため、クランプピース６はこれに変形を加える
ことなく凹所２に嵌合しやすいが、嵌合後、磁気
テープ７に矢印Ａで示す外側方向の張力が加わる
と、第２図および第３図に示す係合突片８が矢印
Ｂ方向に曲げ変形し、また第２図に示す抜止突片
９も矢印Ｃ方向に曲げ変形するため、いずれにお
いてもクランプピース６が抜けがちになり、磁気
テープ７の端部が外れやすい欠点がある。 Another conventional example of the tape clamp structure is shown in FIGS. 2 and 3, in which a pair of engaging protrusions spaced apart are provided at the center of the bottom of a recess 2 provided in a plastic hub 1. A clamp in which the pieces 8, 8 are elastically deformably protruded in the left-right direction, the retaining protrusions 9, 9 are formed at the opening of the recess 2, and the engaging leg pieces 5, 5 are provided at both left and right ends of the web plate 4. The engaging leg pieces 5, 5 of the piece 6 are press-fitted between the retaining protrusions 9, 9 in the recess 2 and the engaging protrusions 8, 8 with the end of the magnetic tape 7 sandwiched therebetween. be. However, in the case shown in FIG. 3, the engagement protrusion 8 is easily bent and deformed, and in the case shown in FIG. The piece 6 can be easily fitted into the recess 2 without deforming it, but when a tension force is applied to the magnetic tape 7 in the outward direction shown by the arrow A after fitting, the engagement shown in FIGS. 2 and 3 occurs. Since the mating protrusion 8 bends and deforms in the direction of arrow B, and the retaining protrusion 9 shown in FIG. The disadvantage is that the part easily comes off.

この考案は、かかる事実に着目して、ハブの外
周面一部の凹所に対しクランプピースを大きく変
形させることなくしかも容易に嵌合することがで
き、また嵌合後におけるクランプピースの抜け防
止を全うしてテープ保持力を強化した磁気テープ
カートリツジを提供しようとするものである。 Focusing on this fact, this invention allows the clamp piece to be easily fitted into a recess in a part of the outer peripheral surface of the hub without significantly deforming it, and also prevents the clamp piece from coming off after fitting. The purpose of the present invention is to provide a magnetic tape cartridge with enhanced tape holding power.

以下、その詳細を図面に基づき説明する。第４
図はこの考案に係る超小型の磁気テープカートリ
ツジ、いわゆるマイクロカセツトを例示してお
り、これの本体ケース１０の内部には左右１対の
プラスチツク製のハブ１１，１１が可回転に装備
してあり、この両ハブ１１，１１の外周面に巻か
れる磁気テープ７の一端部および他端部は各ハブ
１１の外周面一部の凹所１２にプラスチツク製の
クランプピース１３をもつて係止固定され、磁気
テープ７は一方のハブ１１から繰出されて本体ケ
ース１０の前面を通り他方のハブ１１に巻取られ
るものとなつている。 The details will be explained below based on the drawings. Fourth
The figure shows an example of an ultra-small magnetic tape cartridge, a so-called microcassette, according to this invention, in which a pair of left and right plastic hubs 11, 11 are rotatably equipped inside a main body case 10. One end and the other end of the magnetic tape 7 wound around the outer circumferential surface of both hubs 11, 11 are fixed and fixed in a recess 12 in a part of the outer circumferential surface of each hub 11 with a plastic clamp piece 13. The magnetic tape 7 is unwound from one hub 11, passes through the front of the main body case 10, and is wound around the other hub 11.

第６図は上記プラスチツク製のハブ１１の凹所
１２の部分を示す。この凹所１２はハブ１１の外
周一部にハブ軸方向にわたつて形成し、凹所１２
の底部１２ａの中央にはピース保持突部１４をハ
ブ軸方向にわたつて一体形成する。ピース保持突
部１４はこの平坦な先端面１４ａをハブ１１の外
周面ａよりも低くなるように形成し、この先端面
１４ａの左右両側に抜止突片１５，１５を片持ち
状に凹所１２の底部１２ａ側に向く姿勢で突設す
る。この抜止突片１５は厚さｔを比較的薄くして
内外方向に弾性曲げ変形自在に形成され、その先
端１５ａは断面円弧状に形成される。凹所１２内
の左右側面１２ｂ，１２ｂとこれに対向する抜止
突片１５，１５との間には挿入間隙１６，１６を
設け、凹所１２の底部１２ａと各抜止突片１５と
の間には抜止突片１５を内方に曲げ変形自由とす
る空隙１７，１７を前記挿入間隙１６，１６と連
通状に設ける。 FIG. 6 shows the recess 12 of the plastic hub 11. This recess 12 is formed in a part of the outer circumference of the hub 11 in the hub axial direction, and the recess 12
A piece holding protrusion 14 is integrally formed in the center of the bottom portion 12a of the hub in the hub axis direction. The piece holding protrusion 14 has a flat end surface 14a formed to be lower than the outer circumferential surface a of the hub 11, and retaining protrusions 15, 15 are cantilevered into the recess 12 on both left and right sides of the end surface 14a. It is provided in a protruding manner so as to face the bottom 12a side. The retaining protrusion 15 is formed to have a relatively thin thickness t so that it can be elastically bent and deformed in the outward and outward directions, and its tip 15a is formed to have an arcuate cross section. Insertion gaps 16, 16 are provided between the left and right side surfaces 12b, 12b in the recess 12 and the retaining protrusions 15, 15 opposing thereto, and insertion gaps 16, 16 are provided between the bottom 12a of the recess 12 and each retaining protrusion 15. Gaps 17, 17 are provided in communication with the insertion gaps 16, 16 to allow the retaining protrusion 15 to bend inward and be freely deformed.

つぎに、このハブ１１の凹所１２に嵌合するク
ランプピース１３を第５図に示す。このピース１
３は、ハブ１１の外周面ａと同一曲率の外表面ｂ
を有するウエブ板１８と、ウエブ板１８の内面の
左右両端から突設されてハブ１１の挿入間隙１
６，１６に挿入される１対の脚片１９，１９とか
らなる断面溝形に形成してなり、両脚片１９，１
９の各先端の内側に互いに向き合う断面円弧状の
係合突部２０，２０が形成されている。また各脚
片１９の内側の係合突部２０とウエブ板１８の内
面との間には前記抜止突片１５の先端１５ａが係
入しうる係入凹部２１を形成する。各脚片１９の
係合突部２０を有する先端の肉厚最大部は前記挿
通間隙１６の幅よりも大きく形成し、係合突部２
０は抜止突片１５との重なり量δを僅かに得る程
度に突出形成してある。 Next, a clamp piece 13 that fits into the recess 12 of this hub 11 is shown in FIG. This piece 1
3 is an outer surface b having the same curvature as the outer peripheral surface a of the hub 11;
and a web plate 18 having an inner surface of the web plate 18 protruding from both left and right ends to form an insertion gap 1 for the hub 11.
A pair of leg pieces 19, 19 are inserted into the legs 6, 16.
Engagement protrusions 20, 20 each having an arcuate cross-section and facing each other are formed on the inner side of each tip of the protrusion 9. Furthermore, an engagement recess 21 into which the tip 15a of the retaining protrusion 15 can be engaged is formed between the engagement protrusion 20 on the inner side of each leg piece 19 and the inner surface of the web plate 18. The maximum wall thickness at the tip of each leg piece 19 having the engagement protrusion 20 is formed to be larger than the width of the insertion gap 16, and the engagement protrusion 2
0 is formed to protrude to the extent that the amount of overlap δ with the retaining protrusion 15 is slightly obtained.

しかるときは、ハブ１１の凹所１２に磁気テー
プ７の端部をはさんでクランプピース１３を径方
向から圧入嵌合すると、該ピース１３の両脚片１
９，１９の先端が幅狭の挿入間隙１６，１６にそ
れぞれ挿入され、各脚片１９の係合突部２０が対
向する各抜止突片１５に接当作用して各抜止突片
１５を内方の空隙１７側に押し曲げる。そして、
クランプピース１３を完全に圧入した状態におい
ては、ウエブ板１８の内面がピース保持突部１４
の先端面１４ａに接当して、ピース１３の圧入深
さが接当規制され、ハブ外周面ａとピース外表面
ｂとが面一（つらいち）状に連続するとともに、
各脚片１９の係合突部２０が各抜止突片１５を乗
り越え、弾性変形していた各抜止突片１５がほぼ
元の姿勢に弾性復元してその先端１５ａが係入凹
部２１にそれぞれ係入し、各係合突部２０が磁気
テープ７をはさんで重なり量δだけ各抜止突片１
５の先端の空隙１７側に係合する。この嵌合状態
において各抜止突片１５はピース１３の各脚片１
９を凹所１２の左右の側面１２ｂがわに突つ張る
作用をし、凹所１２内においてはピース１３を抜
止め状に保持する。 In such a case, when the clamp piece 13 is press-fitted from the radial direction with the end of the magnetic tape 7 sandwiched in the recess 12 of the hub 11, both leg pieces 1 of the piece 13 are pressed into place.
The tips of the legs 9 and 19 are inserted into the narrow insertion gaps 16 and 16, respectively, and the engaging protrusions 20 of each leg piece 19 abut against the opposing retaining protrusions 15, causing each retaining protrusion 15 to be inserted into the narrow insertion gaps 16 and 16. Push and bend it toward the gap 17 side. and,
When the clamp piece 13 is completely press-fitted, the inner surface of the web plate 18 touches the piece holding protrusion 14.
The press-fitting depth of the piece 13 is regulated by contact with the tip end surface 14a of the hub, and the hub outer circumferential surface a and the piece outer surface b are continuous flush with each other.
The engaging protrusion 20 of each leg piece 19 climbs over each retaining protrusion 15, and each retaining protrusion 15, which had been elastically deformed, elastically returns to almost its original position, and its tip 15a engages with the engaging recess 21, respectively. the magnetic tape 7 between the engaging protrusions 20 and the respective retaining protrusions 1 by the overlap amount δ.
5 engages with the gap 17 side at the tip. In this fitted state, each retaining protrusion 15 is connected to each leg 1 of the piece 13.
The piece 9 acts to push against the left and right side surfaces 12b of the recess 12, and the piece 13 is held in the recess 12 in a manner that prevents it from coming out.

また、この嵌合状態において磁気テープ７を第
７図中矢印Ａ方向に引つ張ると、抜止突片１５に
はテープ張力の合力P₁と係合突部２０から加わる
力P₂との合力Ｐが作用するが、この合力Ｐは抜止
突片１５を圧縮するものであり、抜止突片１５は
内外方向に弾性変形しない。したがつて両抜止突
片１５，１５の突つ張り作用で、ピース１３の両
脚片１９，１９が中央側に僅かに弾性変形したと
してもそれは各抜止突片１５と各脚片１９の係合
突部２０との間におけるテープクランプ力および
ピース１３の抜止めを強固にするだけで、テープ
引張力を受けてもピース１３の各脚片１９および
各抜止突片１５は嵌合状態においては原則的に弾
性変形しない。 Furthermore, when the magnetic tape 7 is pulled in the direction _of arrow _A in FIG. P acts, but this resultant force P compresses the retaining protrusion 15, and the retaining protrusion 15 is not elastically deformed in the inner and outer directions. Therefore, even if the leg pieces 19, 19 of the piece 13 are slightly elastically deformed toward the center due to the tensioning action of the two retaining protrusions 15, 15, this is due to the engagement between each retaining protrusion 15 and each leg piece 19. By simply strengthening the tape clamping force between the piece 13 and the protrusion 20 and preventing the piece 13 from coming off, each leg piece 19 of the piece 13 and each anti-separation protrusion 15 will, in principle, remain in the fitted state even when subjected to tape tension force. It does not undergo elastic deformation.

なお、図示例で凹所１２の左右側面１２ｂ，１
２ｂを断面山形に形成したが、これに代えて第７
図中の仮想線Ｆで示す如く直壁面に形成してもよ
く、この左右側面１２ｂ，１２ｂとピース脚片１
９，１９の外側面との間でピース１３の抜止めや
テープクランプを図る必要はない。 In addition, in the illustrated example, the left and right side surfaces 12b, 1 of the recess 12
2b was formed to have a chevron-shaped cross section, but instead of this, the seventh
It may be formed on a straight wall surface as shown by the imaginary line F in the figure, and the left and right side surfaces 12b, 12b and the piece leg piece 1
There is no need to prevent the piece 13 from coming off or to clamp it with tape between the outer surfaces of the pieces 9 and 19.

また、抜止め片１５はこれが凹所１２の底部１
２ａ側に弾性変形容易なものであればよく、例え
ばこれの厚さｔや重なり量δを変えることによ
り、ピース１３の挿入力、テープ保持力を自由に
選択できる。 Also, the retaining piece 15 is located at the bottom 1 of the recess 12.
Any material may be used as long as it can be easily elastically deformed on the 2a side, and by changing the thickness t and the amount of overlap δ, the insertion force of the piece 13 and the tape holding force can be freely selected.

もちろん、本考案はビデオ磁気テープカートリ
ツジにおけるフランジ付テープリールのハブに磁
気テープの端部を係止連結する場合も同様に適用
できる。 Of course, the present invention can be similarly applied to the case where the end of the magnetic tape is latched and connected to the hub of a flanged tape reel in a video magnetic tape cartridge.

以上説明したように、この考案によれば、ハブ
１１の凹所１２にクランプピース１３を圧入嵌合
したとき、凹所１２側の抜止突片１５，１５が大
きく弾性変形するものとした。したがつてピース
１３のウエブ板１８に両脚片１９，１９の圧入時
の変形が波及して残留する、といつた不具合を生
じない。また、これら抜止突片１５，１５はピー
ス脚片１９，１９の挿入方向つまり凹所１２の底
部１２ａ側に弾性変形する形態としたので、ピー
ス１３の圧入を大きな抵抗なくスムーズに行な
え、磁気テープ７を傷つけることがない。 As explained above, according to this invention, when the clamp piece 13 is press-fitted into the recess 12 of the hub 11, the retaining protrusions 15, 15 on the recess 12 side are largely elastically deformed. Therefore, problems such as the deformation of the leg pieces 19, 19 during press-fitting spreading and remaining on the web plate 18 of the piece 13 do not occur. In addition, since these retaining protrusions 15, 15 are elastically deformed in the insertion direction of the piece leg pieces 19, 19, that is, toward the bottom 12a of the recess 12, the piece 13 can be press-fitted smoothly without much resistance, and the magnetic tape It won't hurt 7.

更に、凹所１２にピース１３を完全に押込み嵌
合したときには、ピース１３の各脚片１９の係合
突部２０が対向する各抜止突片１５の先端を乗り
越えて該先端部の空隙１７側に回り込んで係合す
る。その各抜止突片１５は凹所１２の底部から突
設したピース保持突部１４の左右に片持ち連出さ
れていて該突部１４で剛体結合されたものとなつ
ているので、ピース１３を完全に嵌合した後は両
抜止突片１５，１５が両ピース脚片１９，１９を
凹所１２の左右側面１２ｂ，１２ｂ側に突つ張る
作用をし、各抜止突部１５は凹所１２の中央側つ
まり突部１４側に対しては圧縮されるだけで左右
方向はもちろん内外方向にも弾性変形しない。し
たがつて、ピース１３の抜止めおよびテープ保持
力は強力になり、第７図において磁気テープ７に
Ａ矢視方向への引張力が加わつても、各抜止突起
１５の突つ張り作用を受けて、第２図および第３
図に示す冒述の従来例における如くピース１３の
各脚片１９がＢ矢視方向に曲げ変形することがな
く、ピース抜止めおよびテープ保持機能が高まり
こそすれ低下することはない。 Furthermore, when the piece 13 is completely pushed into the recess 12 and fitted, the engaging protrusion 20 of each leg piece 19 of the piece 13 passes over the tip of each of the opposing retaining protrusions 15 to the gap 17 side of the tip part. go around and engage. Each of the retaining protrusions 15 is cantilevered to the left and right of a piece holding protrusion 14 protruding from the bottom of the recess 12, and is rigidly connected by the protrusion 14. After they are completely fitted, both retaining protrusions 15, 15 act to push both piece leg pieces 19, 19 toward the left and right side surfaces 12b, 12b of the recess 12, and each retaining protrusion 15 The center side, that is, the protrusion 14 side, is only compressed and is not elastically deformed not only in the left-right direction but also in the inside-outside direction. Therefore, the retaining force of the piece 13 and the tape holding force are strong, and even when a tensile force is applied to the magnetic tape 7 in the direction of arrow A in FIG. Figures 2 and 3
Unlike in the conventional example shown in the figure and described above, each leg piece 19 of the piece 13 is not bent and deformed in the direction of arrow B, and the function of preventing the piece from coming off and holding the tape is enhanced and does not deteriorate.

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

第１図ないし第３図はいずれも従来例の磁気テ
ープカートリツジにおける、それぞれ異なるテー
プクランンプ構造を示す断面図である。第４図は
この考案に係る磁気テープカートリツジの一部切
欠き平面図、第５図はクランプピースとハブの凹
所部分とを示す斜視図、第６図はそのハブの凹所
へのクランプピース挿入時の状態を示す平面図、
第７図はそのクランプピースの挿入後の状態を示
す平面図である。 ７……磁気テープ、１０……磁気テープカート
リツジの本体ケース、１１……ハブ、１２……凹
所、１３……クランプピース、１４……ピース保
持突部、１５……抜止突片、１６……挿入間隙、
１７……空隙、１８……ウエブ板、１９……脚
片、２０……係合突部、２１……係入凹部。 1 to 3 are sectional views showing different tape clamp structures in conventional magnetic tape cartridges. Fig. 4 is a partially cutaway plan view of the magnetic tape cartridge according to this invention, Fig. 5 is a perspective view showing the clamp piece and the recessed part of the hub, and Fig. 6 is a clamp in the recessed part of the hub. A plan view showing the state when the piece is inserted,
FIG. 7 is a plan view showing the state after insertion of the clamp piece. 7... Magnetic tape, 10... Magnetic tape cartridge main case, 11... Hub, 12... Recess, 13... Clamp piece, 14... Piece holding protrusion, 15... Removal prevention protrusion, 16 ...insertion gap,
17... Gap, 18... Web plate, 19... Leg piece, 20... Engagement protrusion, 21... Engagement recess.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 磁気テープ７が巻かれるプラスチツク製のハブ
１１の外周面一部に設けた凹所１２と、この凹所
１２に嵌合されるクランクピース１３との間に磁
気テープ７の端部を挾持固定するについて、前記
凹所１２の底部１２ａの中央にピース保持突部１
４を突設し、このピース保持突部１４の左右両側
から内外方向に弾性曲げ変形自在な抜止突片１
５，１５を下向きに連出し、かつ抜止突片１５，
１５とこれに対向する凹所１２内の左右側面１２
ｂ，１２ｂとの間に挿入間隙１６，１６を形成す
るとともに、各抜止突片１５と凹所１２の底部１
２ａとの間に抜止突片１５の曲げ変形を許容する
空隙１７を前記挿入間隙１６と連通状に形成し、
前記クランプピース１３はハブ１１の外周面ａと
ほぼ同一曲率に形成された外表面ｂを有するウエ
ブ板１８と、ウエブ板１８の内面の左右両端から
突設されて前記挿入間隙１６，１６に磁気テープ
７ををはさんで挿入される脚片１９，１９とを有
し、各脚片１９の先端の内側には前記抜止突片１
５の先端の空隙１７側に回り込んで磁気テープ７
をはさんで係合する係合突部２０を有し、該脚片
１９の内側の係合突部２０とウエブ板１８の内面
との間には前記抜止突片１５の先端１５ａが磁気
テープ７を介して係入する係入凹部２１を形成し
てあることを特徴とする磁気テープカートリツ
ジ。 The end of the magnetic tape 7 is clamped and fixed between a recess 12 provided in a part of the outer peripheral surface of a plastic hub 11 around which the magnetic tape 7 is wound, and a crank piece 13 fitted into the recess 12. , there is a piece holding protrusion 1 in the center of the bottom 12a of the recess 12.
A retaining protrusion 1 is provided that protrudes from the piece holding protrusion 14 and can be elastically bent and deformed in the inner and outer directions from both the left and right sides of the piece holding protrusion 14.
5, 15 downward, and the retaining protrusion 15,
15 and the left and right side surfaces 12 in the recess 12 facing thereto
b, 12b, while forming insertion gaps 16, 16 between each retaining protrusion 15 and the bottom 1 of the recess 12.
2a, a gap 17 is formed in communication with the insertion gap 16 to allow bending deformation of the retaining protrusion 15,
The clamp piece 13 includes a web plate 18 having an outer surface b formed with approximately the same curvature as the outer circumferential surface a of the hub 11, and a web plate 18 that protrudes from both left and right ends of the inner surface of the web plate 18, and is provided with a magnet in the insertion gap 16, 16. It has leg pieces 19, 19 inserted with the tape 7 in between, and the retaining protrusion 1 is provided inside the tip of each leg piece 19.
The magnetic tape 7 wraps around the gap 17 at the tip of the magnetic tape 7.
The distal end 15a of the retaining protrusion 15 is disposed between the engaging protrusion 20 on the inside of the leg piece 19 and the inner surface of the web plate 18. 7. A magnetic tape cartridge characterized in that an insertion recess 21 is formed into which the cartridge is inserted.