JPS6190316A - Rotary head cylinder - Google Patents
Rotary head cylinderInfo
- Publication number
- JPS6190316A JPS6190316A JP21084184A JP21084184A JPS6190316A JP S6190316 A JPS6190316 A JP S6190316A JP 21084184 A JP21084184 A JP 21084184A JP 21084184 A JP21084184 A JP 21084184A JP S6190316 A JPS6190316 A JP S6190316A
- Authority
- JP
- Japan
- Prior art keywords
- housing
- shaft
- outer ring
- cap
- preload
- 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.)
- Pending
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
- G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
- G11B15/1808—Driving of both record carrier and head
- G11B15/1825—Driving of both record carrier and head driving or moving the head in a direction which cuts across the direction of travel of the tape, e.g. for helicoïdal scanning
- G11B15/1833—Driving of both record carrier and head driving or moving the head in a direction which cuts across the direction of travel of the tape, e.g. for helicoïdal scanning with head driven in a plane, cyclically around an axis, e.g. on headwheel
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/52—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with simultaneous movement of head and record carrier, e.g. rotation of head
- G11B5/53—Disposition or mounting of heads on rotating support
Abstract
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ーに用いることができる
回転ヘッドシリンダーに関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rotating head cylinder that can be used in a video tape recorder.
従来例の構成とその問題点
近年、ビデオテープレコーダーは小型、軽量化が要求さ
れている。Conventional configuration and its problems In recent years, video tape recorders have been required to be smaller and lighter.
従来のビデオテープレコーダーに用いる回転ヘッドシリ
ンダーは、軸受部分のボールベアリングをハウジングに
接着固定していた。The rotary head cylinder used in conventional video tape recorders has a ball bearing fixed to the housing with adhesive.
しかしながら接着固定では、接着という煩わしい工程を
必要とするのみならず、信頼性に欠けていた。また一度
組立てると、分解することが不可能である七いう問題点
を有していた。However, adhesive fixing not only requires a troublesome process of adhesion, but also lacks reliability. Another problem is that once assembled, it is impossible to disassemble.
発明の目的
本発明の目的は構成が簡単で、高精度な回転ヘノトンリ
ンダ−を提供することである。OBJECTS OF THE INVENTION An object of the present invention is to provide a rotating henoton cylinder that is simple in construction and highly accurate.
発明の構成
本発明の回転ヘッドシリンダーは、磁気テープに映像信
号を記録/再生するための磁気ヘッドを回転自在に軸承
するシャフトと、前記/ヤフトの軸方向の上下2ケ所に
設けられた溝に、複数個のボールを介して回転自在に保
持された外輪と、前記2ケ所の外輪間にあって前記2ケ
所の外輪をシャフトの軸方向に押圧し、予圧を与えるた
めのバネと、前記外輪を保持するためのハウジングと、
前記外1−;^の瑞面を前記ハウジングに押圧固定する
ためのキャップを具備し、かつ前記外輪の一方の両端面
が前記ハウジングとキャップとに挾持されて前記シャツ
トラ保持するように構成したものであり、これにより組
立が簡単で、しかも高精度を得ることができるものであ
る。Structure of the Invention The rotary head cylinder of the present invention includes a shaft that rotatably supports a magnetic head for recording/reproducing video signals on a magnetic tape, and a groove provided in two positions above and below in the axial direction of the shaft. , an outer ring rotatably held via a plurality of balls, a spring located between the two outer rings for pressing the two outer rings in the axial direction of the shaft and applying preload, and holding the outer ring. a housing for
The outer ring is provided with a cap for press-fixing the aperture surface of the outer ring to the housing, and is configured such that one both end surfaces of the outer ring are held between the housing and the cap to hold the shirt collar. This allows easy assembly and high precision.
実施例の説明
以下、本発明の実施例について、図面を参照しながら説
明する。DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.
図は本発明の一実施例に係る回転へソドンリンダーの断
面図を示すものである。図において、10は回転シリン
ダー、12はビデオヘッド、14はハウジング、16は
シャフト、18&。The figure shows a cross-sectional view of a rotating heel cylinder according to an embodiment of the present invention. In the figure, 10 is a rotating cylinder, 12 is a video head, 14 is a housing, 16 is a shaft, and 18&.
18bはベアリング用ボール、20a、20bi−j。18b is a bearing ball, 20a, 20bi-j.
外輪、22はキャップ、24は予圧バネ、26はモータ
ーである。22 is a cap, 24 is a preload spring, and 26 is a motor.
ビデオヘッド12が固定された回転シリンダ−1Qはシ
ャフト16にて回転自在に支持されており、モーター2
6にて回転駆動される。前記シャフト16には、軸方向
の上下2ケ所の外周に溝を有シ、ボール18a、18b
’z介して上下2つの外輪20a 、20bが回転自在
に保持されている。A rotating cylinder 1Q to which a video head 12 is fixed is rotatably supported by a shaft 16, and a motor 2
Rotationally driven at 6. The shaft 16 has grooves on its outer periphery at two locations, upper and lower in the axial direction, and balls 18a, 18b.
Two upper and lower outer rings 20a and 20b are rotatably held via the upper and lower outer rings 20a and 20b.
予圧バネ24は前記2つの外輪20iL、2ob間を上
下に押圧し、前記シャフト16と外輪20a。The preload spring 24 presses vertically between the two outer rings 20iL and 2ob, and presses the shaft 16 and the outer ring 20a.
20bとの遊びを相殺している。This offsets the play with 20b.
前記2つの外輪20&、20bば、固定シリンダーと一
体のハウジング14と嵌合されており、キャップ22に
よって上の外輪20aの上端部が押圧され、固定されて
いる。これによってビデオヘッド12はハウジング14
と一定の高さを保って回転することができる。また、周
囲温度の変化゛ を受けると、前記ハウジング14な
らびにシャフト16は伸縮する。ところが両者の熱膨張
係数に差があるため、伸びを吸収する必要がある。これ
を詳しく説明すると、周囲温度の増加に伴い、ハウジン
グ14およびシャフト16は矢印A 、B方向に伸び、
外輪202L 、20bの間も距離が広がる。The two outer rings 20 & 20b are fitted into the housing 14 which is integrated with the fixed cylinder, and the upper end of the upper outer ring 20a is pressed by the cap 22 and fixed. This allows the video head 12 to move into the housing 14.
It can be rotated while maintaining a constant height. Additionally, the housing 14 and shaft 16 expand and contract when subjected to changes in ambient temperature. However, since there is a difference in the coefficient of thermal expansion between the two, it is necessary to absorb the elongation. To explain this in detail, as the ambient temperature increases, the housing 14 and shaft 16 expand in the directions of arrows A and B.
The distance between the outer rings 202L and 20b also increases.
ところが、前記ハウジング14の伸び量はシャフト16
の伸び量を上まわるので、ハウジング14は下側の外輪
20bに対して矢印B方向へ移動する。この時、前記外
輪20bとハウジング14の嵌め合いによる外輪20b
の矢印A、B方向摺動力Fが前記上下の外輪20& 、
20bの予圧に加算されるので、予圧バネ24のバネ圧
力−6pとすると、外輪20& 、2Ob間の予圧Yは
Y=P十Fとなる。また、周囲温度が低下した時には、
前記下(+11の外輪20bに対してハウジング14は
矢印入方向に移動するので予圧Yはy=p−Fとなる。However, the amount of elongation of the housing 14 is greater than the amount of elongation of the shaft 16.
, the housing 14 moves in the direction of arrow B relative to the lower outer ring 20b. At this time, the outer ring 20b due to the fitting between the outer ring 20b and the housing 14
The sliding force F in the directions of arrows A and B is applied to the upper and lower outer rings 20&,
Since it is added to the preload of the preload spring 20b, if the spring pressure of the preload spring 24 is -6p, the preload Y between the outer rings 20& and 2Ob becomes Y=P10F. Also, when the ambient temperature drops,
Since the housing 14 moves in the direction of the arrow with respect to the lower (+11) outer ring 20b, the preload Y becomes y=p-F.
ここで、ハウジング14と下側外輪20bの嵌め合いか
きつく、摺動力Fが予圧バネ24のバネ圧力Pより大き
い場合、前記周囲温度の上昇時は予圧Yがきわめて大き
くなり、軸受部に負枦がかかるばかりでなく、回転むら
が増加する。また周囲温度が低い場合、予圧y==p−
Fの式においてYの値が0もしくは負となる。これは予
圧が与えられていない状態であり、ボール182L、1
8bを介した外輪20& 、20bとシャフト16の間
にすき間を生じ、前記ビデオヘッド12は正確な軌跡を
描いて回転することが出来なくなる。Here, when the fitting between the housing 14 and the lower outer ring 20b is tight, and the sliding force F is greater than the spring pressure P of the preload spring 24, the preload Y becomes extremely large when the ambient temperature rises, causing a load on the bearing. Not only does this increase the load, but also rotational unevenness increases. Also, if the ambient temperature is low, the preload y==p-
In the formula for F, the value of Y is 0 or negative. This is a state where no preload is applied, and the balls 182L, 1
A gap is created between the outer ring 20 & 20b and the shaft 16 via the outer ring 8b, and the video head 12 cannot rotate while drawing an accurate trajectory.
しかしながら本発明においては前記ハ?ジング14と下
側外輪20bの嵌め合いをゆるくして矢印A、B方向へ
の摺動力Fを予圧バネ24のバネ圧力Pより小さくして
いるので、温度上昇時の軸受負荷増加も小さくまた低温
時にも予圧が○以下になることはない。i ftビデオ
ヘッド12に近い方の上側の外輪20 a ’iミーキ
ャップ2にて固定するjようにすると、周囲温度の変化
によるハウジング14とシャフト16の伸びの差による
前記ビデオヘッド12の高さ変化がきわめて少なく、高
性能の回転ヘッドシリンダーが得られる。However, in the present invention, the above c? Since the fitting between the ring 14 and the lower outer ring 20b is made loose to make the sliding force F in the directions of arrows A and B smaller than the spring pressure P of the preload spring 24, the increase in bearing load when the temperature rises is small and the temperature can be maintained at low temperatures. Even at times, the preload will never be less than ○. i ft The upper outer ring 20 nearer to the video head 12 a 'i When fixed with the mecap 2, the height of the video head 12 due to the difference in elongation between the housing 14 and the shaft 16 due to changes in ambient temperature. A high-performance rotary head cylinder with very little change can be obtained.
発明の効果
以上の説明から明らかなように、本発明はシャフトと一
体に構成された外輪をハウジングに装着して、キャップ
で押圧固定するようにしているので、組立が簡単なばか
りでなく、またハウジングと外輪の摺動に要する力を予
圧バネのバネ圧力よりも小さくすることにより、周囲温
度の変化による予圧力の増大、予圧抜けがおこらず、ま
たビデオヘッドに近い外輪を固定することにより、ビデ
オヘッドの高さ変化もおこりにくいという効果が得られ
る。Effects of the Invention As is clear from the above explanation, the present invention is not only easy to assemble, but also easy to assemble, since the outer ring integrated with the shaft is attached to the housing and fixed by pressing with a cap. By making the force required for sliding between the housing and the outer ring smaller than the spring pressure of the preload spring, there is no increase in preload force or loss of preload due to changes in ambient temperature, and by fixing the outer ring near the video head, The effect is that the height of the video head is less likely to change.
図は本¥鴫の一実施例に係る回転ヘッドシリンダーの断
面図である。
14・・・・・・ハウジング、16・・・・・・シャフ
ト、1sa、18b・・・・・・ボール、202L、2
0b・・・・・・外輪、22・・・・・・キャップ、2
4・・・・・・予圧バネ。The figure is a sectional view of a rotary head cylinder according to an embodiment of the present invention. 14... Housing, 16... Shaft, 1sa, 18b... Ball, 202L, 2
0b... Outer ring, 22... Cap, 2
4...Preload spring.
Claims (2)
気ヘッドを回転自在に軸承するシャフトと、前記シャフ
トの軸方向の上下2ケ所に設けられた溝に、複数個のボ
ールを介して回転自在に保持された外輪と、前記2ケ所
の外輪間にあって前記2ケ所の外輪をシャフトの軸方向
に押圧し、予圧を与えるためのバネと、前記外輪を保持
するためのハウジングと、前記外輪の端面を前記ハウジ
ングに押圧固定するためのキャップを具備し、かつ前記
外輪の一方の両端面が前記ハウジングとキャップとに挾
持されて前記シャフトを保持するように構成したことを
特徴とする回転ヘッドシリンダー。(1) A shaft that rotatably supports a magnetic head for recording/reproducing video signals on a magnetic tape, and a plurality of balls that rotate through grooves provided in two places above and below in the axial direction of the shaft. an outer ring that is freely held; a spring that is located between the two outer rings and presses the two outer rings in the axial direction of the shaft to apply a preload; a housing that holds the outer ring; A rotary head cylinder comprising a cap for press-fixing an end face to the housing, and configured such that both end faces of one of the outer rings are held between the housing and the cap to hold the shaft. .
位置のハウジングに装着され、他方の外輪とハウジング
はシャフトの軸方向に移動自在となるように構成され、
前記外輪とハウジングの軸方向移動に要する力は、2ケ
所の外輪間に予圧を与えているバネの押圧力よりも小さ
い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 cap is attached to the housing at a position that fixes the outer ring closer to the magnetic head, and the other outer ring and the housing are configured to be movable in the axial direction of the shaft,
The rotating head cylinder according to claim 1, wherein the force required to move the outer ring and the housing in the axial direction is smaller than the pressing force of a spring applying preload between the two outer rings. .
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21084184A JPS6190316A (en) | 1984-10-08 | 1984-10-08 | Rotary head cylinder |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21084184A JPS6190316A (en) | 1984-10-08 | 1984-10-08 | Rotary head cylinder |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6190316A true JPS6190316A (en) | 1986-05-08 |
Family
ID=16595993
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP21084184A Pending JPS6190316A (en) | 1984-10-08 | 1984-10-08 | Rotary head cylinder |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6190316A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0398227A2 (en) * | 1989-05-15 | 1990-11-22 | Mitsubishi Denki Kabushiki Kaisha | Magnetic recording and reproducing apparatus |
-
1984
- 1984-10-08 JP JP21084184A patent/JPS6190316A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0398227A2 (en) * | 1989-05-15 | 1990-11-22 | Mitsubishi Denki Kabushiki Kaisha | Magnetic recording and reproducing apparatus |
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