JPS6348092B2 - - Google Patents
Info
- Publication number
- JPS6348092B2 JPS6348092B2 JP58035266A JP3526683A JPS6348092B2 JP S6348092 B2 JPS6348092 B2 JP S6348092B2 JP 58035266 A JP58035266 A JP 58035266A JP 3526683 A JP3526683 A JP 3526683A JP S6348092 B2 JPS6348092 B2 JP S6348092B2
- Authority
- JP
- Japan
- Prior art keywords
- space
- rotary cylinder
- head
- outer circumferential
- circumferential surface
- 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
Links
- 230000002093 peripheral effect Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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
Description
【発明の詳細な説明】
この発明は、ビデオテープレコーダ用の回転シ
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
リンダのヘツ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。
ベース１は、締付けねじ３によつて回転シリンダ
４の端面に取付けられる。この突出部２には、ヘ
ツドチツプ５が装着され、このヘツドチツプ５に
よつて磁気テープ（図示せず）との信号の受け渡
しが行なわれる。なお、回転シリンダ４には、調
整ねじ６がねじ込まれており、この調整ねじ６を
ベース１に押付けていくことによつて、ヘツドチ
ツプ５の上下方向の位置が調整される。 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.
The base 1 is attached to the end face of the rotary cylinder 4 by means of a tightening screw 3. A head chip 5 is attached to the protrusion 2, and signals are exchanged with a magnetic tape (not shown) by this head chip 5. An adjusting screw 6 is screwed into the rotating cylinder 4, and by pressing the adjusting screw 6 against the base 1, the vertical position of the head tip 5 is adjusted.
次にヘツドの取付調整について説明する。ヘツ
ドチツプ５は、通常、１個の回転シリンダ４に２
個以上が対になつて取付けられている。この対に
なつて取付けられたヘツドチツプ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、ヘツドチツプ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、ヘツドチツプ
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. Usually, the head tip 5 is connected to one rotary cylinder 4.
Two or more are installed in pairs. The angle between the pair of head tips 5, the distance from the center of rotation, and the vertical position relative 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 tip 5. The width of this 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。したがつて、回転シリンダ４の高速回転
によつ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
どの欠点があつた。 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 suddenly increases in this space 8, more specifically at the edge 7 of the space. As a result, there were 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.
この発明に従つたビデオテープレコーダ用回転
シリンダは、その外周面から内方に向かつて延び
るように形成された空間部を有し、その空間部に
ヘツドが配置され、そのヘツドに接触するように
磁気テープをその外周面に案内するもので、以下
の特徴を備えたものである。このビデオテープレ
コーダ用回転シリンダにおいては、空間部の空間
部端縁が回転シリンダの外周面より内側へ後退す
るように、回転シリンダの外周面上であつて空間
部と重なる位置に研削部が形成されている。この
研削部は、回転シリンダの外周面の接線方向に軸
心を持つ円筒面を有するように、削り取られたも
のである。 The rotary cylinder for a videotape recorder according to the present invention has a space formed to extend inward from the outer peripheral surface thereof, and a head is disposed in the space, and the cylinder is arranged so as to be in contact with the head. It guides the magnetic tape to its outer circumferential surface and has the following features. In this rotary cylinder for a video tape recorder, a grinding portion is formed on the outer peripheral surface of the rotary cylinder at a position overlapping with the space so that the edge of the space recedes inward from the outer peripheral surface of the rotary cylinder. has been done. This grinding portion is ground so as to have a cylindrical surface whose axis is tangential to the outer circumferential surface of the rotary cylinder.
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
−Ａ方向に軸心を持つ円筒形状で回転シリンダ４
の円周部を削り取つたものである。この軸線Ａ−
Ａは、回転シリンダ４の外周面の接線方向にとら
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。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つて研削部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
る部分はわずかであり、中ほどに行くにつれて回
転シリンダ４は大きく除去される。したがつて、
ヘツ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
で切つた空間部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、回転シ
リンダ４の高速回転によつ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に沿つた円筒面を
有するように形成されるので、たとえば、円柱状
の砥石を回転シリンダの外周面から回転軸心へ移
動させるだけでその研削部を形成することができ
る。したがつて、その加工は非常に容易である。 FIG. 2 is a partial perspective view showing one embodiment of the present invention. In this embodiment, simply speaking, the axis A
- Rotating cylinder 4 with cylindrical shape with axis in direction A
This is obtained by cutting off the circumference of the This axis A-
A is taken in the tangential direction of the outer peripheral surface of the rotating cylinder 4. The grinding portion 9 is formed so that a cylindrical shape centered on the axis A-A overlaps the space portion 8 . 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 part 8, only the circumferential part of the space part 8 near the space part edge 7 is cut into a groove shape, and the space part edge 7 is retreated inward. Also,
Since the rotating cylinder 4 has a cylindrical shape, if the grinding portion 9 is formed along a straight axis such as the axis A-A, only a small portion will be removed at both ends of the grinding portion 9. The rotating cylinder 4 is largely removed toward the middle. Therefore,
In the vicinity where the head is located, the air flow path area, that is, the cross-sectional area of the space 8 and the grinding part 9 cut along the plane passing through the rotation axis of the rotating cylinder 4, changes only in the space 8 as in the conventional case. This is more relaxed than if the In this way, by reducing the rapid change in the air flow path area, the change in the pressure of the air film between the rotary cylinder 4 and the magnetic tape caused by the high speed rotation of the rotary cylinder 4 is alleviated. Waving of the magnetic tape is reduced, and contact between the space edge 7 and the magnetic tape can be prevented. Since the grinding section 9 as described above is formed to have a cylindrical surface along the axis A-A, for example, simply moving a cylindrical grindstone from the outer circumferential surface of the rotating cylinder to the rotation axis can grind the grinding section 9. can form a section. Therefore, its processing is very easy.
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
の寿命が延びるともに、磁気テープにヘツドが安
定して接触することが可能となる。また、回転シ
リンダと磁気テープとの接触を防止するための研
削部の加工が容易であるため、回転シリンダ製造
における生産性、歩留りを低下させることはな
い。 As described above, according to the present invention, the contact between the rotating cylinder and the magnetic tape is reduced, so that the life of the tape is extended and the head can stably contact the magnetic tape. Further, since the grinding portion for preventing contact between the rotary cylinder and the magnetic tape is easily machined, productivity and yield in manufacturing the rotary cylinder are not reduced.
第１図は、従来のビデオテープレコーダ用回転
シリンダのヘツ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はヘツドチツ
プ、６は調整ねじ、７は空間部端縁、８は空間
部、９は研削部を示す。
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 a base, 2 is a protrusion, 3 is a tightening screw, 4 is a rotating cylinder, 5 is a head tip, 6 is an adjustment screw, 7 is an edge of a space, 8 is a space, and 9 is a grinding part.
Claims (1)
形成された空間部を有し、その空間部にヘツドが
配置され、そのヘツドに接触するように磁気テー
プをその外周面に案内する、ビデオテープレコー
ダ用回転シリンダであつて、 前記空間部の空間部端縁が前記回転シリンダの
外周面より内側へ後退するように、前記回転シリ
ンダの外周面上であつて前記空間部と重なる位置
に研削部が形成されており、 前記研削部は、前記回転シリンダの外周面の接
線方向に軸心を持つ円筒面を有するように、削り
取られたものであることを特徴とする、ビデオテ
ープレコーダ用回転シリンダ。[Claims] 1. A magnetic tape has a space extending inward from its outer circumferential surface, a head is disposed in the space, and a magnetic tape is placed on its outer circumferential surface so as to be in contact with the head. A rotary cylinder for a video tape recorder, wherein the space is on the outer circumferential surface of the rotary cylinder so that the edge of the space is retracted inward from the outer circumferential surface of the rotary cylinder. a grinding portion is formed at a position overlapping with the rotary cylinder, and the grinding portion is ground so as to have a cylindrical surface having an axis in a tangential direction of the outer circumferential surface of the rotary cylinder. Rotating cylinder for video tape recorder.
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 JPS59160854A (en) | 1984-09-11 |
| JPS6348092B2 true 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 |
|---|---|
| JPS59160854A (en) | 1984-09-11 |
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