JPS59160854A - Rotary cylinder for video tape recorder - Google Patents
Rotary cylinder for video tape recorderInfo
- Publication number
- JPS59160854A JPS59160854A JP58035266A JP3526683A JPS59160854A JP S59160854 A JPS59160854 A JP S59160854A JP 58035266 A JP58035266 A JP 58035266A JP 3526683 A JP3526683 A JP 3526683A JP S59160854 A JPS59160854 A JP S59160854A
- Authority
- JP
- Japan
- Prior art keywords
- rotary cylinder
- cylinder
- space
- magnetic tape
- video tape
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/60—Guiding record carrier
- G11B15/61—Guiding record carrier on drum, e.g. drum containing rotating heads
Abstract
Description
【発明の詳細な説明】
この発明は、ビデオテープレコーダの回転シリンダに関
する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotating cylinder for a video tape recorder.
第１図は従来のビデオテープレコーダの回転シリンダの
ヘッド取付部の構成を示す部分破断斜視図である。ベー
ス１には、その一端に突出部２が形成されており、全体
として凸字形をしている。FIG. 1 is a partially cutaway perspective view showing the structure of a head mounting portion of a rotary cylinder of a conventional video tape recorder. A protrusion 2 is formed at one end of the base 1, and the base 1 has a convex shape as a whole.
ベース１は、締付けねじ３によって回転シリンダ４の端
面に取付けられる。この突出部２には、ヘッドチップ５
が装着され、このヘッドチップ５によって、磁気テープ
（図示せず）との信号の受は渡しが行なわれる。なお、
回転シリンダ４には、調整ねじ６が挟込まれており、こ
の調整ねじ６を一ベース１に押付けていくことによって
、ヘッドチップ５の上下方向の位置が調整される。The base 1 is attached to the end face of the rotary cylinder 4 by means of a tightening screw 3. This protrusion 2 has a head chip 5.
The head chip 5 receives and transmits signals to and from a magnetic tape (not shown). In addition,
An adjusting screw 6 is inserted into the rotating cylinder 4, and by pressing the adjusting screw 6 against the base 1, the vertical position of the head chip 5 is adjusted.
次にヘッドの取付調整について説明する。ヘッドチップ
５は、通常、１個の回転シリンダ４に２個以上が対にな
って取付けられている。この対になって取付けられたヘ
ッドチップ５の間の角度と、回転中心からの距離と、回
転シリンダ４に対する上下方向の位置、とが、許容範囲
内となるように調整される。上述の調整のため、回転シ
リンダ４には、ヘッドチップ５のまわりに、空間部８が
設けられている。この空間部８は、ヘッドチップ５と磁
気テープとの接触状態を良好にするように、その広さが
定められる。Next, the installation and adjustment of the head will be explained. Two or more head chips 5 are usually attached to one rotating cylinder 4 in pairs. The angle between the head chips 5 attached in pairs, the distance from the center of rotation, and the vertical position with respect to the rotating cylinder 4 are adjusted so that they fall within permissible ranges. For the above-mentioned adjustment, the rotary cylinder 4 is provided with a space 8 around the head chip 5. The width of the space 8 is determined so as to improve the contact between the head chip 5 and the magnetic tape.
従来のビデオテープレコーダ用の回転シリンダ４の空間
部８は、第１図に示すように、空間部端縁７で接する面
がほぼ直角になるように形成されている。したがって、
回転シリンダ４の高速回転によって生じた回転シリンダ
４と磁気テープとの間の空気膜の圧力が、この空間部８
において、より特定的には空間部端縁７において急激に
変化するため、空間部端縁７に磁気テープが接触するな
どの欠点があった。As shown in FIG. 1, the space 8 of the rotary cylinder 4 for a conventional video tape recorder is formed so that the surfaces that meet at the space end edge 7 are approximately at right angles. therefore,
The pressure of the air film between the rotating cylinder 4 and the magnetic tape caused by the high-speed rotation of the rotating cylinder 4 causes this space 8 to
More specifically, since the magnetic tape suddenly changes at the edge 7 of the space, there are drawbacks such as the magnetic tape coming into contact with the edge 7 of the space.
この発明は、上述のような欠点を除去したビデオテープ
レコーダ用回転シリンダを提供することを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to provide a rotary cylinder for a video tape recorder that eliminates the above-mentioned drawbacks.
この発明゛は、要約すれば、回転シリンダのヘッドが位
置する近傍において、回転シリンダの円周部が渦状に削
り取られたことを特徴とする、ビデオテープレコーダ用
回転シリンダである。To summarize, this invention is a rotary cylinder for a video tape recorder, characterized in that the circumference of the rotary cylinder is shaved off in a spiral shape in the vicinity of where the head of the rotary cylinder is located.
上述の目的およびその他の目的と特徴は、以下に図面を
参照して行なう詳細な説明から一層明らかとなろう。The above objects and other objects and features will become more apparent from the detailed description given below with reference to the drawings.
第２図は、この発明の一実施例を示す部分斜視図である
。この実施例は、簡単に言えば、軸線Ａ−八力方向軸心
を持つ円筒形状で回転シリンダ４の円周部を削り取った
ものである。この軸線Ａ−Ａは、回転シリンダ４の回転
の接線方向にとられている。この軸線Ａ−Ａを軸心とす
る円筒形状が、空間部８と重なるように、研削部９が形
成される。FIG. 2 is a partial perspective view showing one embodiment of the present invention. To put it simply, this embodiment is a rotary cylinder 4 having a cylindrical shape having an axis in the axis A--eight force direction, and the circumferential portion of the rotary cylinder 4 is shaved off. This axis A-A is taken in the tangential direction of the rotation of the rotary cylinder 4. The grinding portion 9 is formed so that a cylindrical shape centered on the axis A-A overlaps the space portion 8 .
研削部９は、もし空間部８が形成されていない場合には
、回転シリンダ４の円周部に１つの長い溝状に形成され
る。しかし空間部８と重なるように設けられることによ
り、結果的に空間部８の空間部端縁７近傍の円周部のみ
を溝状に削り、空間部端縁７を内側へと後退させる。ま
た、回転シリンダ４は円筒形状をしているので、軸線Ａ
−Ａのような直線の軸に沿って研削部９を形成すれば、
その研削部９の両端においては除去される部分は僅かで
あり、中程にいくにつれて回転シリンダ４は大きく除去
される。したがって、ヘッドが位置する付近においては
、空気の流路面積、すなわち回転シリンダ４の回転軸を
通る面で切った空間部８および研削部９の断面積の変化
は、従来のような空間部８のみが設けられている場合よ
りも緩和される。このように、空気の流路面積の急激な
変化が減少することにより、空気の圧力の変化が緩和さ
れ、磁気テープの波打ちが減少し、空間部端縁７と磁気
テープとの接触が防止できる。上述のような研削部９は
、軸線Ａ −Ａに沿った円筒面を有するように形成され
、その加工は非常に容易である。If the space 8 is not formed, the grinding portion 9 is formed in the shape of one long groove on the circumference of the rotating cylinder 4. However, by being provided so as to overlap the space 8, only the circumferential portion of the space 8 near the space edge 7 is cut into a groove shape, causing the space edge 7 to retreat inward. Also, since the rotating cylinder 4 has a cylindrical shape, the axis A
- If the grinding part 9 is formed along a straight axis like A,
Only a small portion is removed at both ends of the grinding portion 9, and a large portion of the rotating cylinder 4 is removed toward the middle. Therefore, in the vicinity where the head is located, the air flow path area, that is, the change in the cross-sectional area of the space 8 and the grinding part 9 cut along the plane passing through the rotation axis of the rotary cylinder 4 is different from that of the conventional space 8. This is more relaxed than when only one is provided. In this way, by reducing the rapid change in the air flow path area, the change in air pressure is alleviated, the waving of the magnetic tape is reduced, and contact between the space edge 7 and the magnetic tape can be prevented. . The grinding portion 9 as described above is formed to have a cylindrical surface along the axis A-A, and is very easy to process.
なお、上述の実施例では、研削部９の円筒面の円筒軸方
向が、回転シリンダ４の回転の接線方向と同一であるも
のを示したが、これに限ることなく、その軸方向は、回
転の接線方向に対し斜めに設定され、研削部９が図にお
いて左右対称とならないように形成されてもよい。この
場合、空気膜の圧力分布を考えで、圧力が磁気テープの
走行方向に関して一定になるように研削部９が形成され
るのが好ましい。また、研削部９は、円筒面を有するよ
うな形状だけでなく、平坦面からなる形状であってもよ
い。In the above embodiment, the cylindrical axis direction of the cylindrical surface of the grinding part 9 is the same as the tangential direction of the rotation of the rotary cylinder 4, but the axial direction is not limited to this. The grinding portion 9 may be set obliquely with respect to the tangential direction of the grinding portion 9 and may be formed so that the grinding portion 9 is not symmetrical in the drawing. In this case, considering the pressure distribution of the air film, it is preferable that the grinding portion 9 be formed so that the pressure is constant in the running direction of the magnetic tape. Further, the grinding portion 9 may have a shape not only having a cylindrical surface but also a flat surface.
以上のように、この発明によれば、回転シリンダと磁気
テープとの接触が減少するため、テープの寿命が延びる
とともに磁気テープにヘッドが安定して接−することが
可能となる。As described above, according to the present invention, since the contact between the rotating cylinder and the magnetic tape is reduced, the life of the tape is extended and the head can stably contact the magnetic tape.
第１図は、従来のビデオテープレコーダ用回転シリンダ
のヘッド取付部を示す部分破断斜視図である。第２図は
、この発明の一実施例を示す部分斜視図である。
図において、１はベース、２は突出部、３は締付けねじ
、４は回転シリンダ、５はへラドチップ、６はｍ１ｌｌ
ねじ、７は空間部端縁、８は空間部、９は研削部を示す
。
代理人 葛 野 信 −（外１名）FIG. 1 is a partially cutaway perspective view showing a head mounting portion of a conventional rotary cylinder for a video tape recorder. FIG. 2 is a partial perspective view showing one embodiment of the present invention. In the figure, 1 is the base, 2 is the protrusion, 3 is the tightening screw, 4 is the rotating cylinder, 5 is the helad tip, 6 is m1ll
7 indicates a space edge, 8 indicates a space, and 9 indicates a grinding portion. Agent Shin Kuzuno - (1 other person)
Claims (2)
、 前記回転シリンダのヘッドが位置する近傍において、回
転シリンダの円周部が溝状に削り取られたことを特徴と
する、ビデオテープレコーダ用回転シリンダ。(1) A rotating cylinder for a video tape recorder, characterized in that a circumferential portion of the rotating cylinder is cut into a groove shape in the vicinity where a head of the rotating cylinder is located.
回転の接線方向に軸心を持つ円筒面を有するように・削
り取られる、特許請求の範囲第１項記載のビデオテープ
レコーダ用回転シリンダ。(2) The rotary cylinder for a video tape recorder according to claim 1, wherein the circumferential portion of the rotary cylinder is shaved so as to have a cylindrical surface having an axis in the tangential direction of the rotation of the rotary cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58035266A JPS59160854A (en) | 1983-03-02 | 1983-03-02 | Rotary cylinder for video tape recorder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58035266A JPS59160854A (en) | 1983-03-02 | 1983-03-02 | Rotary cylinder for video tape recorder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59160854A true JPS59160854A (en) | 1984-09-11 |
| JPS6348092B2 JPS6348092B2 (en) | 1988-09-27 |
Family
ID=12436994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58035266A Granted JPS59160854A (en) | 1983-03-02 | 1983-03-02 | Rotary cylinder for video tape recorder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59160854A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5011209A (en) * | 1973-05-31 | 1975-02-05 | ||
| JPS5352121A (en) * | 1976-10-21 | 1978-05-12 | Matsushita Electric Ind Co Ltd | Rotary head cylinder device |
| JPS55105848A (en) * | 1979-02-07 | 1980-08-13 | Victor Co Of Japan Ltd | Rotary guide drum |
-
1983
- 1983-03-02 JP JP58035266A patent/JPS59160854A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5011209A (en) * | 1973-05-31 | 1975-02-05 | ||
| JPS5352121A (en) * | 1976-10-21 | 1978-05-12 | Matsushita Electric Ind Co Ltd | Rotary head cylinder device |
| JPS55105848A (en) * | 1979-02-07 | 1980-08-13 | Victor Co Of Japan Ltd | Rotary guide drum |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6348092B2 (en) | 1988-09-27 |
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