JP2934788B2 - Ceramic tape guide - Google Patents
Ceramic tape guideInfo
- Publication number
- JP2934788B2 JP2934788B2 JP2313491A JP31349190A JP2934788B2 JP 2934788 B2 JP2934788 B2 JP 2934788B2 JP 2313491 A JP2313491 A JP 2313491A JP 31349190 A JP31349190 A JP 31349190A JP 2934788 B2 JP2934788 B2 JP 2934788B2
- Authority
- JP
- Japan
- Prior art keywords
- tape guide
- cylindrical body
- concave portion
- ceramic
- diameter
- 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 - Fee Related
Links
Landscapes
- Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
- Pens And Brushes (AREA)
- Bearings For Parts Moving Linearly (AREA)
- Ceramic Products (AREA)
Description
【発明の詳細な説明】 「産業上の利用分野」 本発明は、磁気テープ用のガイドに関するものであ
る。Description: TECHNICAL FIELD The present invention relates to a guide for a magnetic tape.
「従来の技術」 従来磁気テープ用のガイドとしては、金属材料が使用
されていた。その金属材料の磁気テープ用ガイドは、金
属軸と一体的に作られる場合もあったが、ほとんどの場
合、円筒体形状に作られた後に金属軸とはめ合わせて用
いていた。[Prior Art] Conventionally, a metal material has been used as a guide for a magnetic tape. In some cases, the magnetic tape guide made of the metal material was formed integrally with the metal shaft. However, in most cases, the guide was used after being formed into a cylindrical shape and fitted to the metal shaft.
「発明が解決しようとする課題」 しかし金属材料は、耐摩耗性が不十分であり、磁気テ
ープ用ガイドとして要求される高精度を維持しつつ、高
寿命という目的を達成することは、非常にむずかしい。
かと言って耐摩耗性の点で優れるセラミックスは、加工
を行うのにコストがかかりすぎる。"Problems to be solved by the invention" However, metal materials have insufficient abrasion resistance, and it is extremely difficult to achieve the purpose of a long life while maintaining the high precision required for a magnetic tape guide. It is difficult.
However, ceramics that are excellent in wear resistance are too costly to process.
セラミックの加工にコストがかかる原因の一つは、ダ
イヤモンドを用いて研削加工をするからである。例え
ば、前述従来技術の金属軸とはめ合わせて用いる金属材
料の円筒体をセラミックの円筒体とした場合、セラミッ
クの円筒体の内径面全面積を金属軸との精密な位置合わ
せのために研削加工しなければならない。更に、コスト
がかかるセラミックの研削加工の中でも特に内径面の加
工は、最も時間がかかり、ダイヤモンドの消費も早くコ
ストの低減化が困難である。One of the reasons why the processing of ceramics is costly is that grinding is performed using diamond. For example, when the cylindrical body of the metal material used by fitting with the metal shaft of the above-mentioned prior art is a ceramic cylindrical body, the entire inner diameter surface area of the ceramic cylindrical body is ground for precise alignment with the metal shaft. Must. Furthermore, among the costly ceramic grinding processes, the machining of the inner diameter surface in particular takes the longest time, consumes diamond quickly, and it is difficult to reduce the cost.
本発明の目的は、高寿命に応えるべく高精度を備え
た、安価に製造できるセラミック製テープガイドを提供
することである。SUMMARY OF THE INVENTION An object of the present invention is to provide a ceramic tape guide which has high precision to meet a long service life and can be manufactured at low cost.
「課題を解決するための手段」 その第１の手段は、金属軸に外嵌され、外周面が磁気
テープと摺動する円筒体テープガイドにおいて、セラミ
ックからなり、該円筒体と共通の中心軸を有する凹部を
該円筒体内部に設けてあり、その凹部の大きさが、円筒
体の全長l0、外径d0、内径d1、凹部の軸方向長さｌ、直
径ｄとしたとき、 の式を満たすテープガイドを用いることである。Means for Solving the Problems A first means is a cylindrical tape guide which is fitted around a metal shaft and whose outer peripheral surface slides with a magnetic tape, which is made of ceramic and has a common central shaft. Is provided inside the cylindrical body, and the size of the concave portion is defined as the total length l 0 , outer diameter d 0 , inner diameter d 1 , axial length l of the concave portion, and diameter d of the cylindrical body, That is, a tape guide that satisfies the following equation is used.
ここでセラミックとしては、ジルコニア、アルミナ、
窒化珪素、炭化珪素、サイアロン等の公知の摺動特性の
優れたセラミック材料全てを含む。Here, as the ceramic, zirconia, alumina,
It includes all known ceramic materials having excellent sliding characteristics, such as silicon nitride, silicon carbide, and sialon.
そして金属軸との外嵌方法であるが、圧入、焼ばめ、
冷やしばめ等の公知の嵌合方法なら全て良い。And it is an external fitting method with a metal shaft, but press fit, shrink fit,
Any known fitting method, such as cold fitting, may be used.
ここで直径ｄの凹部は、一つでも複数でも良いが、複
数の場合それぞれの軸方向の長さの和がｌであれば良
い。凹部の数は、少ない方が工程数が減り、コストは安
くなる。Here, the number of the concave portions having the diameter d may be one or more. In the case of a plurality of concave portions, the sum of the lengths in the respective axial directions may be l. The smaller the number of concave portions, the smaller the number of steps and the lower the cost.
次に第２の手段は、第１の手段のうち、一つの凹部を
円筒体内部の両端面内側に接しない位置に設けたテープ
ガイドを用いることである。また、凹部が円筒体両端面
の中心に対して左右対称にあるのが望ましいが、片端面
側によりすぎて、該片端面側の金属軸との嵌合部が狭く
なりすぎて該円筒体が支えられなくならない程度であれ
ば良い。Next, the second means is to use a tape guide of the first means, in which one concave portion is provided at a position not in contact with the inside of both ends inside the cylindrical body. Further, it is desirable that the concave portion is symmetrical with respect to the center of both end surfaces of the cylindrical body. It is only necessary that the support is not lost.
第１と第２の手段を比べると、第２の手段の方がコス
トに安くて良い。Comparing the first and second means, the second means may be cheaper.
「作用」 円筒体（全長l0、外径d0、内径d1）内部の凹部の軸方
向の長さｌと直径ｄの関係を としたのは、１を越えると、円筒体の端部付近の外周側
面と内側に凹部のある外周側面とでは円筒の肉厚が異な
る為、外周側面加工時に変形抵抗に差が出るため、加工
後に外径差が生じ、テープガイドに要求される真直度が
満足できない。"Action" The relationship between the axial length l and the diameter d of the recess inside the cylindrical body (total length l 0 , outer diameter d 0 , inner diameter d 1 ) The reason is that if it exceeds 1, since the thickness of the cylinder differs between the outer peripheral side near the end of the cylindrical body and the outer peripheral side with the concave portion inside, there is a difference in deformation resistance when processing the outer peripheral side. Later, a difference in outer diameter occurs, and the straightness required for the tape guide cannot be satisfied.
「実施例」 本発明セラミック製テープガイドの使用例について第
１図を用いて説明する。本発明セラミック製テープガイ
ド１は、外観は円筒体であるが、内部に該円筒体と共通
の中心軸を有する凹部1aがある。該凹部1aの両端面側に
それぞれ金属軸２とはめ合うはめ合い部1bがある。Example An example of using the ceramic tape guide of the present invention will be described with reference to FIG. The ceramic tape guide 1 of the present invention is cylindrical in appearance, but has a recess 1a having a common central axis with the cylindrical body. At both end surfaces of the concave portion 1a, there are fitting portions 1b to be fitted to the metal shafts 2, respectively.
本発明のセラミック製テープガイド１は、外径８（±
0.02）mm、 全長20（±0.01）mm及び外径部軸方向の真直度５μｍ以
下となっている。The ceramic tape guide 1 of the present invention has an outer diameter of 8 (±
0.02) mm, The overall length is 20 (± 0.01) mm and the straightness in the axial direction of the outer diameter part is 5 μm or less.
テープガイド１の製造法を以下に説明する。 A method for manufacturing the tape guide 1 will be described below.
まず、窒化珪素を主成分とする粉末を加圧成形した
後、切削加工して外観は円筒体で内部に軸方向の長さ及
び径方向の長さを変えた凹部を有する成形体を得る。そ
して焼結し、窒化珪素焼結体（加工前）を得る（その寸
法を第１表に示す）。First, a powder containing silicon nitride as a main component is subjected to pressure molding, and then cut to obtain a molded body having a cylindrical appearance and a concave portion in which the length in the axial direction and the length in the radial direction are changed. Then, it is sintered to obtain a silicon nitride sintered body (before processing) (the dimensions are shown in Table 1).
得られた焼結体を第１に内面研削盤を用いて金属軸と
はめ合うはめ合い部1bを加工する。第２に外径面を円筒
研削盤を用いて加工する。 First, the obtained sintered body is processed into a fitting portion 1b to be fitted to a metal shaft by using an internal grinding machine. Second, the outer diameter surface is processed using a cylindrical grinder.
加工後の寸法は、第２図に示す軸方向の断面図にある
ように外径がd0（＝8mm）、内径がd1（＝6mm）及び全長
がl0（＝20mm）になった。凹部は加工する必要がないの
で加工前後では、凹部径方向の長さｌ、軸方向の長さｄ
の寸法は変わらない。The dimensions after processing were such that the outer diameter was d 0 (= 8 mm), the inner diameter was d 1 (= 6 mm), and the total length was l 0 (= 20 mm), as shown in the axial sectional view shown in FIG. . Since there is no need to process the concave portion, before and after processing, the length l in the radial direction of the concave portion, the length d in the axial direction,
The dimensions of do not change.
そして加工後の寸法を に代入してその値を第１表に示すが、No.7のようにその
値が１を越えると、真直度が6.5（μｍ）となり、テー
プガイドに要求される精度はだせない。And the dimensions after processing And its value is shown in Table 1. When the value exceeds 1, as in No. 7, the straightness becomes 6.5 (μm), and the precision required for the tape guide cannot be obtained.
また、No.8（比較例）のように内部に凹部を設けない
で内径面全部加工した場合の加工時間を１とした加工時
間の比率を表１に示すが、No.6（本発明）のように凹部
の長さが長ければ、内径部加工時間は短くなる。セラミ
ックのように機械的強度を有している本願発明ならば、
ｌ≧0.5l0であっても十分にはめ合い強度を維持でき
る。そしつｌが長ければ長いほど内径のはめあい部1bの
研削する長さ（l0−ｌ）を短くすることができる。Also, Table 1 shows the ratio of the processing time to the processing time of 1 when the entire inner diameter surface was processed without providing a recess inside as in No. 8 (Comparative Example). When the length of the concave portion is long as in the above, the processing time for the inner diameter portion is reduced. If the present invention has mechanical strength like ceramic,
Even l ≧ 0.5l 0 able to maintain a sufficiently fit strength. Longer makings l longer length of grinding of the inner diameter of the fitting portion 1b (l 0 -l) can be shortened.
本願発明（No.1〜No.6）のように円筒体内部の凹部の
大きさを を満たすように設ければ、外周側面加工時にたわみを生
ずることなく、軸方向の外周側面の真直度は、十分満足
することができる。As in the present invention (No. 1 to No. 6), the size of the concave portion inside the cylindrical body is When the outer peripheral side surface is provided so as to satisfy the above, the straightness of the outer peripheral side surface in the axial direction can be sufficiently satisfied without causing bending during the processing of the outer peripheral side surface.
「効果」 本発明は、高寿命に応えるべく高精度を備えた、安価
に製造できるセラミック製テープガイドを提供すること
ができる産業上極めて有用な発明である。[Effects] The present invention is an industrially useful invention capable of providing a ceramic tape guide with high precision to meet a long service life and which can be manufactured at low cost.
第１図は、本願発明のセラミック製テープガイドの使用
例を示す。第２図は、本願発明のセラミック製テープガ
イドの中心軸を含む軸方向断面図である。 １……セラミック製テープガイド、1a……凹部、1b……
金属軸とのはめ合い部、２……金属軸、l0……テープガ
イド全長、ｄ……凹部の直径、d0……テープガイド外
径、ｌ……凹部の軸方向長さ、d1……テープガイド内径FIG. 1 shows an example of use of the ceramic tape guide of the present invention. FIG. 2 is an axial sectional view including the central axis of the ceramic tape guide of the present invention. 1 ... ceramic tape guide, 1a ... recess, 1b ...
Fitting portion with metal shaft, 2 ... metal shaft, l 0 ... total length of tape guide, d ... diameter of concave portion, d 0 ... outer diameter of tape guide, l ... axial length of concave portion, d 1 …… Tape guide inner diameter
Claims (2)
摺動する円筒体において、セラミックからなり、該円筒
体と共通の中心軸を有する凹部を該円筒体内部に設けて
あり、その凹部の大きさが、円筒体の全長l0、外径d0、
内径d1、凹部の軸方向長さｌ、直径ｄとしたとき、 の式を満たすことを特徴とするテープガイド。1. A cylindrical body which is fitted around a metal shaft and whose outer peripheral surface slides with a magnetic tape, wherein a concave portion made of ceramic and having a common central axis with the cylindrical body is provided inside the cylindrical body. The size of the recess is the total length l 0 of the cylindrical body, the outer diameter d 0 ,
When the inner diameter d 1 , the axial length l of the concave portion, and the diameter d, A tape guide characterized by satisfying the following formula:
て、一つの凹部を円筒体内部の両端面内側に接しない位
置に設けたことを特徴とするテープガイド。2. The tape guide according to claim 1, wherein one concave portion is provided at a position not in contact with the inside of both end surfaces inside the cylindrical body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2313491A JP2934788B2 (en) | 1990-11-19 | 1990-11-19 | Ceramic tape guide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2313491A JP2934788B2 (en) | 1990-11-19 | 1990-11-19 | Ceramic tape guide |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04182959A JPH04182959A (en) | 1992-06-30 |
| JP2934788B2 true JP2934788B2 (en) | 1999-08-16 |
Family
ID=18041953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2313491A Expired - Fee Related JP2934788B2 (en) | 1990-11-19 | 1990-11-19 | Ceramic tape guide |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2934788B2 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61165873A (en) * | 1985-01-16 | 1986-07-26 | Fuji Photo Film Co Ltd | Magnetic tape cassette |
| JPS63184426U (en) * | 1987-05-19 | 1988-11-28 | ||
| JPH0272437U (en) * | 1988-11-22 | 1990-06-01 |
-
1990
- 1990-11-19 JP JP2313491A patent/JP2934788B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04182959A (en) | 1992-06-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |