JPH0695373B2 - Rotating head cylinder - Google Patents
Rotating head cylinderInfo
- Publication number
- JPH0695373B2 JPH0695373B2 JP62041982A JP4198287A JPH0695373B2 JP H0695373 B2 JPH0695373 B2 JP H0695373B2 JP 62041982 A JP62041982 A JP 62041982A JP 4198287 A JP4198287 A JP 4198287A JP H0695373 B2 JPH0695373 B2 JP H0695373B2
- Authority
- JP
- Japan
- Prior art keywords
- cylindrical portion
- cylindrical
- cylinder
- wall thickness
- bottom portion
- 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
Description
【発明の詳細な説明】 産業上の利用分野 本発明はビデオテープレコーダなどに用いられる回転ヘ
ッドシリンダーに関し、良好な外周加工精度が得られる
形状を与えるとともに、シリンダーの重量を軽減しよう
とするものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary head cylinder used in a video tape recorder or the like, and is intended to reduce the weight of the cylinder while giving a shape capable of obtaining a good outer peripheral machining accuracy. is there.
従来の技術 回転シリンダーと固定シリンダーとから成り、回転シリ
ンダーに取り付けられた磁気ヘッドが、固定シリンダー
に設けられたガイドに沿って摺動する磁気テープを走査
することにより、テープに記録再生を行う回転ヘッドシ
リンダーにおいては、回転シリンダーおよび固定シリン
ダーの外周面は、磁気テープが安定に走行するために、
非常に高い真円度および円筒度が要求される。2. Description of the Related Art Rotation in which recording and reproduction are performed on a tape by scanning a magnetic tape that consists of a rotating cylinder and a fixed cylinder, and a magnetic head attached to the rotating cylinder slides along a guide provided on the fixed cylinder. In the head cylinder, the outer peripheral surfaces of the rotating cylinder and the fixed cylinder have a stable running of the magnetic tape,
Very high roundness and cylindricity are required.
これらの形状精度を達成する上で最も問題となる点は、
旋盤で加工する際の、チャッキング力と切削抵抗による
変形である。チャッキング力と切削抵抗による変形が大
きいと、加工時に精度が出せても、旋盤から取り外した
時に精度は大きく低下して必要な精度が達成できなくな
ってしまう。The most important point in achieving these shape accuracy is
This is the deformation caused by the chucking force and cutting resistance when machining with a lathe. If the deformation due to the chucking force and the cutting resistance is large, even if the accuracy can be obtained at the time of processing, the accuracy will be greatly reduced when it is removed from the lathe, and the required accuracy cannot be achieved.
このため従来のシリンダー〔たとえば、ナショナルテク
ニカルレポート（National Technical Report）Vol.31
No.6 Dec.1985 p59〕では、全体の肉厚を十分に大
きくすることにより上記の変形を防いでいた。第２図は
このような回転ヘッドシリンダー装置の構造を表した断
面図である。For this reason, conventional cylinders (eg National Technical Report Vol.31
No. 6 Dec. 1985 p59], the above deformation was prevented by sufficiently increasing the overall wall thickness. FIG. 2 is a sectional view showing the structure of such a rotary head cylinder device.
固定シリンダー31にはボールベアリング32を介してシャ
フト33が取り付けられており、シャフト33には焼きばめ
等の手段によりディスク34が取り付けられている。そし
て、ヘッド35を有する回転シリンダー36はネジ止め等の
手段によってディスク34に取り付けられ、モーター部37
により駆動されるシャフト33と一体的に回転する。A shaft 33 is attached to the fixed cylinder 31 via a ball bearing 32, and a disc 34 is attached to the shaft 33 by means such as shrink fitting. The rotating cylinder 36 having the head 35 is attached to the disk 34 by means such as screwing, and the motor unit 37
It rotates integrally with the shaft 33 driven by.
そして、前記したようにチャック力に対して十分な強度
を与える必要があることから、第２図に示すように回転
シリンダー36は平均的に肉厚が確保された構成である。Since it is necessary to give sufficient strength to the chucking force as described above, the rotary cylinder 36 has a structure in which the wall thickness is secured on average as shown in FIG.
発明が解決しようとする問題点 しかしながら上記回転シリンダーの構成では、加工時の
チャック位置や形状に関係なく平均的に肉厚を確保した
構成になっているため、軽量化には適さないという問題
点を有していた。Problems to be Solved by the Invention However, in the configuration of the rotary cylinder, the thickness is ensured on average irrespective of the chuck position and shape at the time of processing, which is not suitable for weight reduction. Had.
本発明は上記問題点に鑑み、薄肉化しても強度的に問題
のない構造とすることにより、軽量な回転ヘッドシリン
ダーを提供するものである。In view of the above problems, the present invention provides a lightweight rotary head cylinder by adopting a structure that does not cause a problem in strength even if it is made thin.
問題点を解決するための手段 上記問題点を解決するために、本発明の回転ヘッドシリ
ンダーは円筒状の外周を形成する第１の円筒部と、この
第１の円筒部より小径でかつ第１の円筒部と同心の第２
の円筒部と、前記第１の円筒部の一端部と前記第２の円
筒部の一端部間に形成した第１の底部と、前記第２の円
筒部の他端部に形成した第２の底部を有し、前記第２の
円筒部の肉厚を前記第１の円筒部の肉厚と同等もしくは
薄くするとともに前記第１の底部および第２の底部の肉
厚を前記第２の円筒部の肉厚よりも厚くしたものであ
る。Means for Solving the Problems In order to solve the above problems, the rotary head cylinder of the present invention has a first cylindrical portion forming a cylindrical outer circumference, and a first cylindrical portion having a diameter smaller than that of the first cylindrical portion. Second concentric with the cylindrical part of
A cylindrical portion, a first bottom portion formed between one end of the first cylindrical portion and one end of the second cylindrical portion, and a second bottom portion formed at the other end of the second cylindrical portion. A bottom portion, the wall thickness of the second cylindrical portion is made equal to or smaller than the wall thickness of the first cylindrical portion, and the wall thicknesses of the first bottom portion and the second bottom portion are made equal to the second cylindrical portion. Thicker than the wall thickness of.
作用 このような形状とすることにより、加工時のチャック力
に対して充分な強度を与えるとともに円筒部の薄肉化を
はかることが可能となり、軽量でかつ高精度な回転ヘッ
ドシリンダーを実現できるものである。Action With such a shape, it is possible to give sufficient strength to the chucking force at the time of processing and to reduce the thickness of the cylindrical part, and it is possible to realize a lightweight and highly accurate rotary head cylinder. is there.
実施例 以下に、本発明の一実施例について図を用いて説明す
る。第１図と第２図に示すのは、回転シリンダー１の旋
盤（図示せず）による加工状態を示す部分断面図である
が、特に第１図は矢印A,B,C方向から加工する場合を示
し、回転シリンダー１の中でも特に加工精度を要求され
る部分の加工状態を示すものである。２が第１の円筒部
であり、その外周面2a,2b,2cに磁気テープ（図示せず）
が添接走行するものである。３は第１の円筒部２と同心
の第２の円筒部であり、この一端部と第１の円筒部２の
一端部間には第１の底部４が形成されている。第２の円
筒部３の他端部には、第２の底部５が形成されている。
さて、第１の円筒部２の内周面は円錐形状になってい
て、自由端Ｃの肉厚t1から第１の底部４側の肉厚t2へと
厚くなるようなテーパ形状である。この寸法について
は、断面がテーパの単純梁の場合と類似させて考える
と、同じたわみ強度をもつ一定肉厚の円筒形状シリンダ
ーに較べて、肉厚t2はやや厚くなるが、自由端部Ｃ側の
肉厚t1についてはかなり薄くなるので軽量化に効果があ
る。Example An example of the present invention will be described below with reference to the drawings. 1 and 2 are partial cross-sectional views showing a processing state of the rotary cylinder 1 by a lathe (not shown). Particularly, FIG. 1 shows a case where processing is performed in the directions of arrows A, B and C. The figure shows the processing state of a portion of the rotary cylinder 1 that requires particularly high processing accuracy. 2 is a first cylindrical portion, and a magnetic tape (not shown) on the outer peripheral surfaces 2a, 2b, 2c
Is a splicing run. A second cylindrical portion 3 is concentric with the first cylindrical portion 2, and a first bottom portion 4 is formed between the one end portion and the one end portion of the first cylindrical portion 2. A second bottom portion 5 is formed at the other end of the second cylindrical portion 3.
Now, the inner peripheral surface of the first cylindrical part 2 they become conical shape, it is thickened such tapered from a thickness t 1 of the free end C to the thickness t 2 of the first bottom portion 4 side . Regarding this dimension, if it is considered similar to the case of a simple beam having a tapered cross section, the wall thickness t 2 is slightly thicker than that of a cylindrical cylinder having a constant wall thickness and the same flexural strength, but the free end C Since the side wall thickness t 1 is considerably thin, it is effective in reducing the weight.
一方、第２の円筒部３の肉厚は第１の円筒部２の平均肉
厚〔第１図の例では（t1＋t2）/2で示される〕よりも薄
くなるように形成されている。また第１の底部４および
第２の底部５の肉厚は共に第２の円筒部３の肉厚よりも
厚く構成している。また、第２の底部５の回転軸６方向
の高さは第１の円筒部２と同等以上に設定されている。
10は回転軸６を中心に回転する旋盤のチャックである。
チャック10は被切削物である回転シリンダー１をチャッ
ク部11でチャックしており、この時の回転軸６方向のチ
ャック長さは第１図に示すように略々第２の底部５の肉
厚と同じ長さとなるようにしている。したがってチャッ
ク10によるチャック力は第２の底部５の面内で受けるこ
とになり、薄肉の第２の円筒部３にひずみが発生しにく
くなる。またチャック10の端部12は第１の底部４の端面
4bに当接するような構成となっているが、こうした構成
をとることで第１の円筒部２の外周面2a,2b,2cおよび第
１の底部４の端面4aを切削加工する時に発生しやすい振
動（いわゆるビビリ）を有効に防止することが可能で、
高精度加工に大変有利となる。On the other hand, the wall thickness of the second cylindrical portion 3 is formed to be thinner than the average wall thickness of the first cylindrical portion 2 [in the example of FIG. 1 , indicated by (t 1 + t 2 ) / 2]. There is. The wall thicknesses of the first bottom portion 4 and the second bottom portion 5 are both thicker than the wall thickness of the second cylindrical portion 3. Further, the height of the second bottom portion 5 in the direction of the rotation axis 6 is set to be equal to or higher than that of the first cylindrical portion 2.
Reference numeral 10 is a chuck of a lathe which rotates around the rotary shaft 6.
The chuck 10 chucks the rotary cylinder 1 which is the object to be cut by the chuck portion 11. At this time, the chuck length in the direction of the rotary shaft 6 is approximately the thickness of the second bottom portion 5 as shown in FIG. It has the same length as. Therefore, the chucking force by the chuck 10 is received within the surface of the second bottom portion 5, and strain is less likely to occur in the thin second cylindrical portion 3. The end 12 of the chuck 10 is the end face of the first bottom part 4.
Although it is configured to come into contact with 4b, such a configuration is likely to occur when the outer peripheral surfaces 2a, 2b, 2c of the first cylindrical portion 2 and the end surface 4a of the first bottom portion 4 are cut. It is possible to effectively prevent vibration (so-called chattering),
Very advantageous for high precision machining.
第２図に示しているのは第１図に示す仕上げ加工の前に
矢印Ｄ方向からの加工を行なう状態を示し、チャック10
のチャック部11でチャックする第２の円筒部３の被チャ
ック部3aなどを精度良く加工するものである。但し、第
２図の実施例での第２の円筒部３は内周面3bが円錐形状
になっている。しかし第１図の実施例と同様に第２の円
筒部３の平均肉厚〔（h1＋h2）/2で示される〕は第１の
円筒部２の平均肉厚〔第１図と同様に（t1＋t2）/2で示
される〕よりも薄くなっている。20はチャックであり回
転シリンダー１をチャック部21でチャックしており、こ
の時の回転軸６方向のチャック長さは第２図に示すよう
に略々第１の底部４の肉厚と同じ長さとなるようにして
いる。したがってこの時もチャック20によるチャック力
は第１の底部４の面内で受けることになり、薄肉の第１
の円筒部２にひずみは発生しにくくなる。FIG. 2 shows a state in which machining from the direction of arrow D is performed before the finishing shown in FIG.
The chucked portion 3a of the second cylindrical portion 3 to be chucked by the chuck portion 11 is accurately processed. However, the inner peripheral surface 3b of the second cylindrical portion 3 in the embodiment of FIG. 2 has a conical shape. However, as in the embodiment of FIG. 1, the average wall thickness of the second cylindrical portion 3 [indicated by (h 1 + h 2 ) / 2] is the average wall thickness of the first cylindrical portion 2 [similar to FIG. At (t 1 + t 2 ) / 2]. Reference numeral 20 denotes a chuck, and the rotary cylinder 1 is chucked by the chuck portion 21. At this time, the chuck length in the direction of the rotary shaft 6 is substantially the same as the wall thickness of the first bottom portion 4 as shown in FIG. I am trying to be. Therefore, also at this time, the chucking force by the chuck 20 is received within the surface of the first bottom portion 4, and the thin first
Strain is less likely to occur in the cylindrical portion 2 of.
そして、第１図の場合も第２図の場合もチャック力は旋
盤のバイト（図示せず）の切削抵抗により発生するトル
クを上回る値に設定されるので、通常バイトの切削抵抗
の背分力などに比べかなり大きな値となるため、チャッ
ク力を受ける第１の底部4,第２の底部５の肉厚を第１の
円筒部２や第２の円筒部３の肉厚よりも厚くしておくこ
とは、加工時のひずみを防止する上で大きな効果があ
る。In both the case of FIG. 1 and the case of FIG. 2, the chucking force is set to a value exceeding the torque generated by the cutting resistance of the turning tool (not shown) of the lathe, so the back force of the cutting resistance of the normal cutting tool is set. Since the value is considerably larger than that of the above, the thickness of the first bottom portion 4 and the second bottom portion 5 that receive the chucking force is made thicker than the thickness of the first cylindrical portion 2 and the second cylindrical portion 3. Preservation is very effective in preventing distortion during processing.
第３図（ａ）に示したのは第１図に示す仕上げ加工にお
いて第２の底部５の肉厚を変化させた時の第１の円筒部
２の自由端面Ｃの振れ量の変化を示し、第３図（ｂ）に
示すのは第２の底部５の肉厚を変化させた時の第１の円
筒部２の外周面2a,2b,2cの各位置における真円度の変化
を示したものであるが、この時の第１の円筒部２および
第２の円筒部３はいずれも肉厚1mmに設定したものであ
る。これから、第１の円筒部２の自由端側の精度がやや
悪くなる傾向があるが、第２の底部の肉厚を厚くするこ
とによる高精度化へ効果が確認される。FIG. 3 (a) shows a change in the amount of deflection of the free end face C of the first cylindrical portion 2 when the wall thickness of the second bottom portion 5 is changed in the finish processing shown in FIG. FIG. 3 (b) shows the change in roundness at each position of the outer peripheral surfaces 2a, 2b, 2c of the first cylindrical portion 2 when the wall thickness of the second bottom portion 5 is changed. However, both the first cylindrical portion 2 and the second cylindrical portion 3 at this time are set to have a wall thickness of 1 mm. From this, although the accuracy on the free end side of the first cylindrical portion 2 tends to be slightly deteriorated, it is confirmed that increasing the thickness of the second bottom portion has the effect of increasing the accuracy.
また第１の円筒部２は一方が自由端になっているが、第
２の円筒部３は両端部に第１の底部４と第２の底部５が
接合された構成になっているため、第２の円筒部３の肉
厚は第１の円筒部２の肉厚より薄くしても加工時の切削
力を耐え得る強度が得られるものである。Further, one side of the first cylindrical portion 2 is a free end, but the second cylindrical portion 3 has a structure in which the first bottom portion 4 and the second bottom portion 5 are joined to both end portions, Even if the thickness of the second cylindrical portion 3 is smaller than that of the first cylindrical portion 2, the strength capable of withstanding the cutting force during processing is obtained.
なお本実施例では第１の円筒部の内周面を円錐状とした
が、本発明はこれに限ることでないことは自明である。Although the inner peripheral surface of the first cylindrical portion has a conical shape in this embodiment, it is obvious that the present invention is not limited to this.
発明の効果 以上のように、本発明による回転ヘッドシリンダーは円
筒状の外周を形成する第１の円筒部と、この第１の円筒
部より小径でかつ第１の円筒部と同心の第２の円筒部
と、前記第１の円筒部の一端部と前記第２の円筒部の一
端部間に形成した第１の底部と、前記第２の円筒部の他
端部に形成した第２の底部を有し、前記第２の円筒部の
肉厚を前記第１の円筒部の肉厚と同等もしくは薄くする
とともに前記第１の底部および第２の底部の肉厚を前記
第２の円筒部の肉厚よりも厚くしたことにより、従来の
ような加工精度を確保するために全体の肉厚を均一に厚
くしていくことなく、簡単な構成で加工精度を確保しな
がら強度的に余裕のある部分を薄肉化し軽量化できるの
で、装置全体の軽量化に大きく寄与するものである。EFFECTS OF THE INVENTION As described above, the rotary head cylinder according to the present invention includes the first cylindrical portion forming the cylindrical outer periphery and the second cylindrical portion having a diameter smaller than that of the first cylindrical portion and concentric with the first cylindrical portion. A cylindrical portion, a first bottom portion formed between one end portion of the first cylindrical portion and one end portion of the second cylindrical portion, and a second bottom portion formed at the other end portion of the second cylindrical portion. And the wall thickness of the second cylindrical portion is equal to or smaller than the wall thickness of the first cylindrical portion, and the wall thicknesses of the first bottom portion and the second bottom portion are equal to those of the second cylindrical portion. By making it thicker than the wall thickness, it is possible to secure processing accuracy with a simple structure and to have strength in terms of strength, without increasing the thickness of the entire body to ensure uniform processing accuracy as in the past. Since the part can be made thinner and lighter in weight, it greatly contributes to the weight reduction of the entire apparatus.
第１図，第２図は本発明の回転シリンダーの加工状態を
示す部分断面図、第３図は本発明の効果を説明する加工
精度図、第４図は従来の回転ヘッドシリンダーの断面図
である。 １……回転シリンダー、２……第１の円筒部、３……第
２の円筒部、４……第１の底部、５……第２の底部。1 and 2 are partial cross-sectional views showing the working state of the rotary cylinder of the present invention, FIG. 3 is a working accuracy diagram for explaining the effect of the present invention, and FIG. 4 is a cross-sectional view of a conventional rotary head cylinder. is there. 1 ... Rotating cylinder, 2 ... 1st cylinder part, 3 ... 2nd cylinder part, 4 ... 1st bottom part, 5 ... 2nd bottom part.
Claims (3)
前記回転シリンダーと同軸上に位置し略同一径の円筒状
外周を有する固定シリンダーとから成る回転ヘッドシリ
ンダーであって、前記回転シリンダーは前記円筒状の外
周を形成する第１の円筒部と、この第１の円筒部より小
径でかつ第１の円筒部と同心の第２の円筒部と、前記第
１の円筒部の一端部と前記第２の円筒部の一端部間に形
成した第１の底部と、前記第２の円筒部の他端部に形成
した第２の底部を有し、前記第２の円筒部の肉厚を前記
第１の円筒部の肉厚と同等もしくは薄くするとともに前
記第１の底部および第２の底部の肉厚を前記第２の円筒
部の肉厚よりも厚くしたことを特徴とする回転ヘッドシ
リンダー。1. A rotating cylinder having a cylindrical outer periphery,
A rotary head cylinder comprising a fixed cylinder located coaxially with the rotary cylinder and having a cylindrical outer circumference of substantially the same diameter, the rotary cylinder comprising a first cylindrical portion forming the cylindrical outer circumference, A second cylindrical portion having a smaller diameter than the first cylindrical portion and concentric with the first cylindrical portion, and a first cylindrical portion formed between one end portion of the first cylindrical portion and one end portion of the second cylindrical portion. A bottom portion and a second bottom portion formed at the other end of the second cylindrical portion, and the wall thickness of the second cylindrical portion is made equal to or smaller than the wall thickness of the first cylindrical portion, and A rotary head cylinder, wherein the first bottom portion and the second bottom portion are made thicker than the second cylindrical portion.
とともに、前記第２の円筒部の肉厚を前記第１の円筒部
の平均肉厚と同等もしくは薄く構成したことを特徴とす
る特許請求の範囲第（１）項記載の回転ヘッドシリンダ
ー。2. The inner peripheral surface of the first cylindrical portion is formed in a conical shape, and the thickness of the second cylindrical portion is made equal to or thinner than the average thickness of the first cylindrical portion. The rotary head cylinder according to claim (1).
なくとも一方を円錐状に形成するとともに、この第２の
円筒部の平均肉厚を第１の円筒部の平均肉厚と同等もし
くは薄く構成したことを特徴とする特許請求の範囲第
（１）項もしくは第（２）項のいずれかに記載の回転ヘ
ッドシリンダー。3. At least one of the inner peripheral surface and the outer peripheral surface of the second cylindrical portion is formed into a conical shape, and the average wall thickness of this second cylindrical portion is equal to the average wall thickness of the first cylindrical portion. Alternatively, the rotary head cylinder according to any one of claims (1) and (2), characterized in that the rotary head cylinder has a thin structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62041982A JPH0695373B2 (en) | 1987-02-25 | 1987-02-25 | Rotating head cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62041982A JPH0695373B2 (en) | 1987-02-25 | 1987-02-25 | Rotating head cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63209020A JPS63209020A (en) | 1988-08-30 |
| JPH0695373B2 true JPH0695373B2 (en) | 1994-11-24 |
Family
ID=12623406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62041982A Expired - Fee Related JPH0695373B2 (en) | 1987-02-25 | 1987-02-25 | Rotating head cylinder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0695373B2 (en) |
-
1987
- 1987-02-25 JP JP62041982A patent/JPH0695373B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63209020A (en) | 1988-08-30 |
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| LAPS | Cancellation because of no payment of annual fees |