JP2983681B2 - Swing lever type reel base drive mechanism - Google Patents
Swing lever type reel base drive mechanismInfo
- Publication number
- JP2983681B2 JP2983681B2 JP3093159A JP9315991A JP2983681B2 JP 2983681 B2 JP2983681 B2 JP 2983681B2 JP 3093159 A JP3093159 A JP 3093159A JP 9315991 A JP9315991 A JP 9315991A JP 2983681 B2 JP2983681 B2 JP 2983681B2
- Authority
- JP
- Japan
- Prior art keywords
- gear
- reel
- slip
- torque
- reel base
- 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
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- Structure Of Transmissions (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ＶＴＲのリール台駆動
機構に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel drive mechanism for a VTR.
【０００２】[0002]
【従来の技術及びその問題点】図４、図５に示す如く、
ＶＴＲの供給リール台(１)と巻取リール台(11)をモード
の切り換えに応じて選択に回転駆動する首振りレバー式
リール台駆動装置は、両リール台(１)(11)の間に、支点
軸(21)を中心に回動可能に首振りレバー(２)を配備して
いる。2. Description of the Related Art As shown in FIGS.
The swinging lever type reel stand driving device that selectively rotates the supply reel stand (1) and the take-up reel stand (11) of the VTR according to the mode switching is provided between the two reel stands (1) and (11). A swing lever (2) is provided so as to be rotatable about a fulcrum shaft (21).
【０００３】図３に示す如く、首振りレバー(２)の支点
軸(21)と同心に上下２段に第１、第２ギヤ(41)(42)を互
いに独立して回転可能に且つフエルト板(51)による第１
スリップ機構(５)を介して連繋配備している。首振りレ
バー(２)の自由端に前記第２ギヤ(42)に噛合し且つ供給
リール台(１)と巻取リール台(11)に選択的に噛合可能な
第３ギヤ(43)を枢支している。As shown in FIG. 3, first and second gears (41) and (42) are rotatable independently of each other in two stages vertically and concentrically with a fulcrum shaft (21) of a swing lever (2). 1st by plate (51)
They are connected and arranged via a slip mechanism (5). A third gear (43) meshing with the second gear (42) and selectively meshing with the supply reel table (1) and the take-up reel table (11) is pivotally connected to the free end of the swing lever (2). Support.
【０００４】第３ギヤ(43)と首振りレバー(２)との間に
フエルト板(61)を介装して第２スリップ機構(６)を構成
している。A felt plate (61) is interposed between the third gear (43) and the swing lever (2) to constitute a second slip mechanism (6).
【０００５】前記首振りレバー(２)の第１ギヤ(41)、第
２ギヤ(42)の近傍に両ギヤ(41)(42)に選択的に噛合可能
な駆動ギヤ(３)を昇降可能に配備している。駆動ギヤ
(３)の回転方向の切換えにより、首振りレバー(２)を回
動させ、第３ギヤ(43)を何れか一方のリール台に噛合せ
しめて回転駆動する。A drive gear (3), which can selectively mesh with both gears (41) and (42), can be moved up and down near the first gear (41) and the second gear (42) of the swing lever (2). Has been deployed. Drive gear
By switching the rotation direction in (3), the swing lever (2) is rotated, and the third gear (43) is engaged with one of the reel bases and driven to rotate.
【０００６】第１ギヤ(41)と第２ギヤ(42)は第１スリッ
プ機構(５)により両ギヤ(41)(42)間でスリップトルクを
発生し、支点軸(21)に対してはフリーで回転する。上記
第１スリップ機構(５)はリール台を一定トルクで駆動す
る役割をなす。第２スリップ機構(６)は、第３ギヤ(43)
が無負荷で空回転することを防止してレバー(２)を第２
ギヤ(42)の回転方向に首振り回転させる作用、即ち動力
の伝達経路を切換える役割をなす。The first gear (41) and the second gear (42) generate slip torque between the two gears (41) and (42) by the first slip mechanism (5). Rotate for free. The first slip mechanism (5) serves to drive the reel base with a constant torque. The second slip mechanism (6) includes a third gear (43).
The lever (2) is moved to the second position by preventing the
It has the function of swinging and rotating in the rotation direction of the gear (42), that is, the role of switching the power transmission path.
【０００７】上記の首振りレバー式リール台駆動機構で
は、首振り動作中は特に問題はないが、首振り終了後、
第３ギヤ(43)が供給リール台(１)或は巻取リール台(11)
に噛合してリール台を駆動している間、常に第３ギヤ(4
3)が首振りレバー(２)に対してスリップしており、その
スリップは本来のリール台駆動トルクに対し、全くロス
となる。In the above-mentioned swing lever type reel stand drive mechanism, there is no particular problem during the swing operation.
The third gear (43) is a supply reel base (1) or a take-up reel base (11).
When the reel base is driven by meshing with the third gear (4
3) is slipping with respect to the swing lever (2), and the slip is completely lost with respect to the original reel base driving torque.
【０００８】従って、一定のリール台駆動トルクを得る
ための第１スリップ機構(５)は、この首振りのための第
２スリップ機構(６)によるトルクのロスを見込んで、予
めトルクを高く設定せねばならず、機構の小型化の妨げ
となり、信頼性にも問題があった。又、容量の大きなモ
ータ(図示せず)を必要とし、消費電力の点からも不利で
ある。Therefore, the first slip mechanism (5) for obtaining a constant reel base driving torque sets a high torque in advance in anticipation of the loss of torque by the second slip mechanism (6) for swinging. It has to do so, which hinders downsizing of the mechanism, and has a problem in reliability. Further, a large-capacity motor (not shown) is required, which is disadvantageous in terms of power consumption.
【０００９】更に、首振り用の第２スリップ機構(５)に
於ける摩擦面の相対回転数は、 第３ギヤ(43)の回転数
と等しくなるため、早送り／巻戻しモード、早送り再生
／巻戻し再生モードの高速化のために、リール台を高速
回転駆動すると耐久性が問題となる。Further, since the relative rotation speed of the friction surface in the second slip mechanism (5) for swinging is equal to the rotation speed of the third gear (43), the fast forward / rewind mode, the fast forward reproduction / If the reel base is driven to rotate at high speed in order to increase the speed of the rewind reproduction mode, durability becomes a problem.
【００１０】本発明は、以上の従来機構の問題点を解決
する首振りレバー式リール台駆動機構を明らかにするも
のである。The present invention clarifies a swing lever type reel base driving mechanism which solves the above-mentioned problems of the conventional mechanism.
【００１１】[0011]
【課題を解決する手段】本発明の首振りレバー式リール
台駆動機構は、供給リール台(１)と巻取リール台(11)と
の間に首振りレバー(２)を回動可能に配備し、レバー
(２)の回転支点軸(21)と同心に上下２段に第１、第２ギ
ヤ(41)(42)を互いに独立して回転可能に配備し、両ギヤ
(41)(42)間に、一定以上の負荷が作用すればスリップす
る第１スリップ機構(５)を介在させ、レバー(２)の自由
端に前記第２ギヤ(42)に噛合し且つ供給リール台(１)と
巻取リール台(11)に選択的に噛合可能な第３ギヤ(43)を
枢支し、第１、第２ギヤ(41)(42)に選択的に駆動ギヤ
(３)を噛合し、駆動ギヤ(３)の回転方向の切換えによっ
てレバー(２)を首振りさせ、第３ギヤ(43)を何れか一方
のリール台に噛合せしめてリール台を回転駆動する駆動
装置に於て、第３ギヤ(43)と同軸に第４ギヤ(44)を回転
自由に配備して第１ギヤ(41)に噛合し、第３ギヤ(47)と
第４ギヤ(44)との間に、一定以上の負荷が作用するとス
リップする第２スリップ機構(６)を介在させ、第１ギヤ
(41)から第４ギヤ(44)に対する減速比よりも、第２ギヤ
(42)から第３ギヤ(43)に対する減速比の方が大きく、
又、第２スリップ機構(６)のスリップトルクよりも第１
スリップトルクが大である。According to the swing lever type reel stand driving mechanism of the present invention, a swing lever (2) is rotatably provided between a supply reel stand (1) and a take-up reel stand (11). Then lever
The first and second gears (41) and (42) are arranged rotatably independently of each other in two upper and lower stages concentrically with the rotation fulcrum shaft (21) of (2).
(41) A first slip mechanism (5) that slips when a load exceeding a certain level acts between the second gear (42) and the second gear (42) is engaged with the free end of the lever (2). A third gear (43) that can selectively mesh with the reel base (1) and the take-up reel base (11) is pivotally supported, and a driving gear is selectively connected to the first and second gears (41) and (42).
(3) is engaged, the lever (2) is swung by switching the direction of rotation of the drive gear (3), and the third gear (43) is engaged with one of the reel bases, and the reel base is rotationally driven. In the driving device, a fourth gear (44) is rotatably disposed coaxially with the third gear (43), meshes with the first gear (41), and the third gear (47) and the fourth gear (44). ), A second slip mechanism (6) that slips when a load exceeding a certain level acts on the first gear.
From the reduction ratio of (41) to the fourth gear (44),
The reduction ratio from (42) to the third gear (43) is larger,
Also, the first torque is smaller than the slip torque of the second slip mechanism (6).
The slip torque is large.
【００１２】[0012]
【作用及び効果】駆動ギヤ(３)から第１ギヤ(41)に伝え
られた駆動力は、第４ギヤ(44)を駆動すると同時に第１
スリップ機構(５)を介して第２ギヤ(42)を駆動し、更に
第３ギヤ(43)を駆動する。[Operation and Effect] The driving force transmitted from the driving gear (3) to the first gear (41) drives the fourth gear (44) at the same time as the first driving.
The second gear (42) is driven via the slip mechanism (5), and the third gear (43) is further driven.
【００１３】ここで第１ギヤ(41)と第２ギヤ(42)との間
の第１スリップ機構(５)がスリップしていない時には、
減速比の関係から第４ギヤ(44)の方が第３ギヤ(43)より
も高速で回転しようとする。Here, when the first slip mechanism (5) between the first gear (41) and the second gear (42) is not slipping,
The fourth gear (44) tends to rotate at a higher speed than the third gear (43) from the relation of the reduction ratio.
【００１４】この第４ギヤ(44)と第３ギヤ(43)の間には
第２スリップ機構(６)を介して摩擦力が発生するため、
第４ギヤ(44)と第３ギヤ(43)の間に速度差が生じること
に起因する負荷が作用する。Since a frictional force is generated between the fourth gear (44) and the third gear (43) via the second slip mechanism (6),
A load acts due to a speed difference between the fourth gear (44) and the third gear (43).
【００１５】従って首振りレバー(２)がフリーで回転す
る状態、即ち、第３ギヤ(43)が供給リール台(１)或は、
巻取リール台(11)と噛み合っていない状態(図５参照)で
は、第１ギヤ(41)及び第２ギヤ(42)が回転しても第４ギ
ヤ(44)及び第３ギヤ(43)は前記負荷により、枢軸軸(22)
に対しては回転せずに、首振りレバー(２)が支点軸(21)
に対して回転する。Therefore, the state in which the swing lever (2) rotates freely, that is, when the third gear (43) is in the supply reel stage (1) or
In a state in which the first gear (41) and the second gear (42) are rotated in a state where they are not engaged with the take-up reel base (11) (see FIG. 5), the fourth gear (44) and the third gear (43) are rotated. Is the pivot axis (22)
Without turning, the swing lever (2) is pivoted on the fulcrum shaft (21).
Rotate against.
【００１６】首振りレバー(２)の回転方向は、駆動ギヤ
(３)従って、第１ギヤ(41)の回転方向により決り、図４
に示す如く、第１ギヤ(41)が時計方向に回転すると、レ
バー(２)も時計方向に回転して、第３ギヤ(43)は巻取リ
ール台(11)に噛合し、第１ギヤ(41)が反時計方向に回転
すると、レバー(２)も反時計方向に回転して、第３ギヤ
(43)は供給リール台(１)に噛合する。The direction of rotation of the swing lever (2) is determined by the drive gear.
(3) Therefore, it is determined by the rotation direction of the first gear (41).
When the first gear (41) rotates clockwise, the lever (2) also rotates clockwise, and the third gear (43) meshes with the take-up reel base (11), as shown in FIG. When (41) rotates counterclockwise, the lever (2) also rotates counterclockwise, and the third gear
(43) meshes with the supply reel base (1).
【００１７】第３ギヤ(43)が、供給リール台(１)或は巻
取リール台(11)と噛み合い、首振りレバー(２)の回転が
止まると、噛合している相手リール台に負荷が加わって
いない場合は、スリップトルクの高い第１スリップ機構
(５)、即ち第１ギヤ(41)と第２ギヤ(42)との間はスリッ
プせず、スリップトルクの低い第２スリップ機構(６)、
即ち第４ギヤ(44)と、第３ギヤ(43)間でスリップが生
じ、第３ギヤ(43)が供給リール台(１)或は巻取リール台
(11)を駆動する。When the third gear (43) engages with the supply reel base (1) or the take-up reel base (11), and the rotation of the swing lever (2) stops, a load is applied to the mating reel base. The first slip mechanism having a high slip torque
(5) That is, the second slip mechanism (6) which does not slip between the first gear (41) and the second gear (42) and has a low slip torque,
That is, a slip occurs between the fourth gear (44) and the third gear (43), and the third gear (43) is connected to the supply reel table (1) or the take-up reel table.
(11) is driven.
【００１８】この状態は、モード移行途中やテープの垂
み取り時に現われる。プレーモード、早送り再生モー
ド、巻戻し再生モード等のピンチローラとキャプスタン
とでテープを一定速度で搬送しているモードでは、第３
ギヤ(43)によって強制駆動されるリール台(ここでは巻
取リール台とする)の反対側の供給リール台には一定の
トルクをかけて、テープ巻き径によりリール台の回転数
が変化しても、常にテープが垂まない様に巻取る必要が
ある。This state appears during the transition to the mode or when the tape is dropped. In a mode in which the tape is transported at a constant speed by the pinch roller and the capstan, such as a play mode, a fast-forward playback mode, and a rewind playback mode, the third mode is used.
A constant torque is applied to the supply reel table on the opposite side of the reel table (here, the take-up reel table) forcibly driven by the gear (43), and the rotation speed of the reel table changes depending on the tape winding diameter. However, it is necessary to always wind the tape so that it does not hang.
【００１９】そこで、このモードにおいては、巻取リー
ル台(11)の最大回転数よりも高い回転数で巻取リール台
(11)を駆動できるだけの回転数で、第１ギヤ(41)を駆動
することによって、第１ギヤ(41)と第２ギヤ(42)の間、
及び第４ギヤ(44)と第３ギヤ(43)の間で、夫々スリップ
が生じる。Therefore, in this mode, the take-up reel base (11) is rotated at a higher rotational speed than the maximum rotational speed of the take-up reel base (11).
By driving the first gear (41) at a rotational speed capable of driving the (11), the distance between the first gear (41) and the second gear (42) is reduced.
And a slip occurs between the fourth gear (44) and the third gear (43).
【００２０】即ち、第１ギヤ(41)と第２ギヤ(42)間のス
リップトルクを、第２ギヤ(42)から第３ギヤ(43)を介し
て巻取リール台(11)にトルクを伝達する経路と、第１ギ
ヤ(41)から第４ギヤ(44)に回転を伝え、更に第４ギヤ(4
4)と第３ギヤ(43)間のスリップトルクを第３ギヤ(43)に
伝え、巻取リール台へトルクを伝達する経路の２つの経
路によってトルク伝達が行なわれる。That is, the slip torque between the first gear (41) and the second gear (42) is applied to the take-up reel table (11) from the second gear (42) via the third gear (43). A transmission path, and rotation is transmitted from the first gear (41) to the fourth gear (44).
The slip torque between 4) and the third gear (43) is transmitted to the third gear (43), and the torque is transmitted through two paths of the torque transmission path to the take-up reel table.
【００２１】従って、第１スリップ機構(５)と、第２ス
リップ機構(６)の両方のスリップトルクが共にリール台
を駆動するためのトルクとなり、首振りに伝わるトルク
は、この状態ではロスにならずリール台駆動を助ける。Accordingly, the slip torque of both the first slip mechanism (5) and the second slip mechanism (6) becomes a torque for driving the reel base, and the torque transmitted to the swing in this state is a loss in this state. Not to help drive the reel stand.
【００２２】[0022]
【実施例】図１に本発明によるリール台駆動機構の一例
を断面図で示す。尚、図１はプレーモード、早送り再生
モード、巻戻し再生モード等のリール台を一定トルクで
駆動するモードを示している。供給リール台(１)と巻取
リール台(11)との間に首振りレバー(２)を回動可能に配
備する。FIG. 1 is a sectional view showing an example of a reel base driving mechanism according to the present invention. FIG. 1 shows a mode in which the reel base is driven with a constant torque, such as a play mode, a fast-forward playback mode, and a rewind playback mode. A swing lever (2) is rotatably provided between the supply reel table (1) and the take-up reel table (11).
【００２３】レバー(２)の支点軸(21)上に大径の第１ギ
ヤ(41)及び小径の第２ギヤ(42)を２段に且つ互いに独立
して回転可能に配備し、第２ギヤ(42)に接着したフエル
ト板(51)を第１ギヤ(41)に当接する共に、スプリング(5
2)にて第１ギヤ(41)を第２ギヤ(42)に付勢し、第１スリ
ップ機構(５)を構成する。A large-diameter first gear (41) and a small-diameter second gear (42) are rotatably arranged in two stages and independently of each other on a fulcrum shaft (21) of the lever (2). The felt plate (51) adhered to the gear (42) is brought into contact with the first gear (41) and the spring (5
In 2), the first gear (41) is urged to the second gear (42) to constitute the first slip mechanism (5).
【００２４】レバー(２)の自由端に設けた枢軸(22)上
に、前記第２ギヤ(42)に噛合可能な第３ギヤ(43)及び第
１ギヤ(44)に噛合可能な第４ギヤ(44)を回転自由に配備
し、第４ギヤ(44)にそ接着したフエルト板(61)を第３ギ
ヤ(43)に当接する共に、スプリング(62)にて第３ギヤ(4
3)を第４ギヤ(44)に付勢し、第２スリップ機構(６)を構
成する。On a pivot (22) provided at the free end of the lever (2), a third gear (43) meshable with the second gear (42) and a fourth gear meshable with the first gear (44). The gear (44) is freely rotatable, the felt plate (61) adhered to the fourth gear (44) is brought into contact with the third gear (43), and the third gear (4) is moved by the spring (62).
3) is urged to the fourth gear (44) to constitute the second slip mechanism (6).
【００２５】第１スリップ機構(５)のスリップトルクは
第２スリップ機構(６)のスリップトルクよりも大きくな
る様に、各スリップ機構が構成される。第３ギヤ(43)
は、リール台(１)(12)の歯面(12)と同一高さに位置して
いる。Each slip mechanism is configured so that the slip torque of the first slip mechanism (5) is larger than the slip torque of the second slip mechanism (6). Third gear (43)
Are located at the same height as the tooth surface (12) of the reel bases (1) and (12).
【００２６】第１ギヤ(41)と第２ギヤ(42)の近傍に、モ
ータ(図示せず)に連繋された回転駆動ギヤ(３)がモード
の切換えに応じて上下動可能に配備される。駆動ギヤ
(３)は、小径ギヤ(31)と大径ギヤ(32)を上下２段に形成
しており、図１のモードでは下降位置にあって、小径ギ
ヤ(31)が第１ギヤ(41)に噛合している。In the vicinity of the first gear (41) and the second gear (42), a rotary drive gear (3) connected to a motor (not shown) is provided so as to be vertically movable in accordance with mode switching. . Drive gear
In (3), the small-diameter gear (31) and the large-diameter gear (32) are formed in two stages, upper and lower. In the mode shown in FIG. Is engaged.
【００２７】前記の如く、第１ギヤ(41)よりも第２ギヤ
(42)の方がピッチ円径が小さいため、第１ギヤ(41)と第
４ギヤ(44)によるギヤ列よりも、第２ギヤ(42)と第３ギ
ヤ(43)によるギヤ列の方が減速比が大きい。As described above, the second gear is shifted more than the first gear (41).
Since the pitch circle diameter of (42) is smaller, the gear train of the second gear (42) and the third gear (43) is more suitable than the gear train of the first gear (41) and the fourth gear (44). Has a large reduction ratio.
【００２８】然して、駆動ギヤ(３)から第１ギヤ(41)に
伝えられた駆動力は、第４ギヤ(44)を駆動すると同時に
第１スリップ機構(５)を介して第２ギヤ(42)を駆動し、
更に第３ギヤ(43)を駆動する。However, the driving force transmitted from the driving gear (3) to the first gear (41) drives the fourth gear (44) and at the same time simultaneously drives the second gear (42) via the first slip mechanism (5). ),
Further, the third gear (43) is driven.
【００２９】ここで第１ギヤ(41)と第２ギヤ(42)との間
の第１スリップ機構(５)がスリップしていない時には、
減速比の関係から第４ギヤ(44)の方が第３ギヤ(43)より
も高速で回転しようとする。この第４ギヤ(44)と第３ギ
ヤ(43)の間には第２スリップ機構(６)を介して摩擦力が
発生するため、第４ギヤ(44)と第３ギヤ(43)の間に速度
差が生じることに起因する負荷が作用する。Here, when the first slip mechanism (5) between the first gear (41) and the second gear (42) is not slipping,
The fourth gear (44) tends to rotate at a higher speed than the third gear (43) from the relation of the reduction ratio. Since a frictional force is generated between the fourth gear (44) and the third gear (43) via the second slip mechanism (6), the frictional force is generated between the fourth gear (44) and the third gear (43). The load caused by the difference in speed acts on the vehicle.
【００３０】従って首振りレバー(２)がフリーで回転す
る状態、即ち、第３ギヤ(43)が供給リール台(１)或は、
巻取リール台(11)と噛み合っていない状態(図５参照)で
は、第１ギヤ(41)及び第２ギヤ(42)が回転しても第４ギ
ヤ(44)及び第３ギヤ(43)は前記負荷により、枢軸軸(22)
に対しては回転せずに、首振りレバー(２)が支点軸(21)
に対して回転する。Therefore, the state in which the swing lever (2) is free to rotate, that is, the third gear (43) is in the supply reel stage (1) or
In a state in which the first gear (41) and the second gear (42) are rotated in a state where they are not engaged with the take-up reel base (11) (see FIG. 5), the fourth gear (44) and the third gear (43) are rotated. Is the pivot axis (22)
Without turning, the swing lever (2) is pivoted on the fulcrum shaft (21).
Rotate against.
【００３１】首振りレバー(２)の回転方向は、駆動ギヤ
(３)従って、第１ギヤ(41)の回転方向により決り、図４
に示す如く、第１ギヤ(41)が時計方向に回転すると、レ
バー(２)も時計方向に回転して、第３ギヤ(43)は巻取リ
ール台(11)に噛合し、第１ギヤ(41)が反時計方向に回転
すると、レバー(２)も反時計方向に回転して、第３ギヤ
(43)は供給リール台(１)に噛合する。The direction of rotation of the swing lever (2) is determined by the drive gear.
(3) Therefore, it is determined by the rotation direction of the first gear (41).
When the first gear (41) rotates clockwise, the lever (2) also rotates clockwise, and the third gear (43) meshes with the take-up reel base (11), as shown in FIG. When (41) rotates counterclockwise, the lever (2) also rotates counterclockwise, and the third gear
(43) meshes with the supply reel base (1).
【００３２】第３ギヤ(43)が、供給リール台(１)或は巻
取リール台(11)と噛み合い、首振りレバー(２)の回転が
止まると、噛合している相手リール台に負荷が加わって
いない場合は、スリップトルクの高い第１スリップ機構
(５)、即ち第１ギヤ(41)と第２ギヤ(42)との間はスリッ
プせず、スリップトルクの低い第２スリップ機構(６)、
即ち第４ギヤ(44)と、第３ギヤ(43)間でスリップが生
じ、第３ギヤ(43)が供給リール台(１)或は巻取リール台
(11)を駆動する。When the third gear (43) meshes with the supply reel table (1) or the take-up reel table (11) and the rotation of the swing lever (2) stops, a load is applied to the mating reel table. The first slip mechanism having a high slip torque
(5) That is, the second slip mechanism (6) which does not slip between the first gear (41) and the second gear (42) and has a low slip torque,
That is, a slip occurs between the fourth gear (44) and the third gear (43), and the third gear (43) is connected to the supply reel table (1) or the take-up reel table.
(11) is driven.
【００３３】この状態は、モード移行途中やテープの垂
み取り時に現われる。プレーモード、早送り再生モー
ド、巻戻し再生モード等のピンチローラとキャプスタン
とでテープを一定速度で搬送しているモードでは、第３
ギヤ(43)によって強制駆動されるリール台(ここでは巻
取リール台とする)の反対側の供給リール台には一定の
トルクをかけて、テープ巻き径によりリール台の回転数
が変化しても、常にテープが垂まない様に巻取る必要が
ある。This state appears during the transition to the mode or at the time of tape dripping. In a mode in which the tape is transported at a constant speed by the pinch roller and the capstan, such as a play mode, a fast-forward playback mode, and a rewind playback mode, the third mode is used.
A constant torque is applied to the supply reel table on the opposite side of the reel table (here, the take-up reel table) forcibly driven by the gear (43), and the rotation speed of the reel table changes depending on the tape winding diameter. However, it is necessary to always wind the tape so that it does not hang.
【００３４】そこで、このモードにおいては、巻取リー
ル台(11)の最大回転数よりも高い回転数で巻取リール台
(11)を駆動できるだけの回転数で、第１ギヤ(41)を駆動
することによって、第１ギヤ(41)と第２ギヤ(42)の間、
及び第４ギヤ(44)と第３ギヤ(43)の間で、夫々スリップ
が生じる。Therefore, in this mode, the take-up reel base (11) is rotated at a higher rotational speed than the maximum rotational speed of the take-up reel base (11).
By driving the first gear (41) at a rotational speed capable of driving the (11), the distance between the first gear (41) and the second gear (42) is reduced.
And a slip occurs between the fourth gear (44) and the third gear (43).
【００３５】即ち、第１ギヤ(41)と第２ギヤ(42)間のス
リップトルクを、第２ギヤ(42)から第３ギヤ(43)を介し
て巻取リール台(11)にトルクを伝達する経路と、第１ギ
ヤ(41)から第４ギヤ(44)に回転を伝え、更に第４ギヤ(4
4)と第３ギヤ(43)間のスリップトルクを第３ギヤ(43)に
伝え、巻取リール台へトルクを伝達する経路の２つの経
路によってトルク伝達が行なわれる。That is, the slip torque between the first gear (41) and the second gear (42) is applied to the take-up reel table (11) from the second gear (42) via the third gear (43). A transmission path, and rotation is transmitted from the first gear (41) to the fourth gear (44).
The slip torque between 4) and the third gear (43) is transmitted to the third gear (43), and the torque is transmitted through two paths of the torque transmission path to the take-up reel table.
【００３６】従って、第１スリップ機構(５)と、第２ス
リップ機構(６)の両方のスリップトルクが共にリール台
を駆動するためのトルクとなる。Therefore, the slip torque of both the first slip mechanism (5) and the second slip mechanism (6) is the torque for driving the reel base.
【００３７】上記点が本発明による機構の、従来機構と
最も異なる特徴であり、従来機構で問題となっていた首
振り用第２スリップ機構(６)のロスがなくなり、第１ギ
ヤ(41)と第２ギヤ(42)間の第１スリップ機構(５)のトル
クを下げることができ、機構の小型軽量化に有利であ
り、信頼性の向上に繋がる。The above point is the most different feature of the mechanism according to the present invention from the conventional mechanism. The loss of the second swing mechanism (6) for swinging which has been a problem in the conventional mechanism is eliminated, and the first gear (41) is eliminated. The torque of the first slip mechanism (5) between the first and second gears (42) can be reduced, which is advantageous for reducing the size and weight of the mechanism and improving reliability.
【００３８】又、駆動用モータの負荷も減り、小型のモ
ータの使用が可能となり、消費電力も下げることができ
る。Further, the load on the driving motor is reduced, so that a small motor can be used, and the power consumption can be reduced.
【００３９】一方、早送り／巻戻しモードの如く、スリ
ップ機構を介さずにダイレクトにモータのトルクを伝え
る必要のあるモードでは、図２に示す様に、駆動ギヤ
(３)を軸方向に上昇スライドさせることにより、回転伝
達経路を切換えて、第２ギヤ(42)から第３ギヤ(42)を駆
動する。On the other hand, in a mode such as a fast-forward / rewind mode in which the torque of the motor must be transmitted directly without passing through a slip mechanism, as shown in FIG.
By sliding (3) upward in the axial direction, the rotation transmission path is switched to drive the third gear (42) from the second gear (42).
【００４０】この時、第１ギヤ(41)と第２ギヤ(42)間の
スリップトルクは、第４ギヤ(44)と第３ギヤ(43)間のス
リップトルクよりも大きいため、前述の場合と同様に首
振りを行ない、巻取リール台(11)と第３ギヤ(43)が噛み
合った時点からは、第２ギヤ(42)が直接に第３ギヤ(43)
を駆動する。このため、第４ギヤ(44)と第３ギヤ(43)の
間でスリップが生じ、この状態では、このスリップトル
クはリール駆動に対してはロスとなる。At this time, the slip torque between the first gear (41) and the second gear (42) is larger than the slip torque between the fourth gear (44) and the third gear (43). The second gear (42) is directly moved to the third gear (43) from the point in time when the take-up reel stand (11) and the third gear (43) mesh with each other.
Drive. For this reason, a slip occurs between the fourth gear (44) and the third gear (43), and in this state, the slip torque is lost with respect to the reel drive.
【００４１】しかし、この時の第２スリップ機構(６)の
フエルト板(61)と第３ギヤ(43)の間の相対回転数は、第
４ギヤ(44)と第３ギヤ(43)の回転数の差であり、実際の
第３ギヤ(43)の回転数よりも遥かに小さい。従って、従
来機構に比べて首振りのためのスリップ機構の信頼性が
大幅に向上する。However, at this time, the relative rotation speed between the felt plate (61) of the second slip mechanism (6) and the third gear (43) is the same as that of the fourth gear (44) and the third gear (43). This is the difference between the rotation speeds, and is much smaller than the actual rotation speed of the third gear (43). Therefore, the reliability of the slip mechanism for swinging the head is greatly improved as compared with the conventional mechanism.
【００４２】本発明は、上記実施例の構成に限定される
ことはなく、特許請求の範囲に記載の範囲で種々の変形
が可能である。The present invention is not limited to the configuration of the above embodiment, and various modifications can be made within the scope of the claims.
【図１】本発明によるリール台駆動機構の断面図であ
る。FIG. 1 is a sectional view of a reel base driving mechanism according to the present invention.
【図２】同上の早送り／巻戻しモードに於ける断面図で
ある。FIG. 2 is a cross-sectional view in a fast-forward / rewind mode according to the first embodiment;
【図３】従来例のリール台駆動装置の断面図である。FIG. 3 is a sectional view of a conventional reel base driving device.
【図４】巻取リール台を駆動する状態の駆動機構の平面
図である。FIG. 4 is a plan view of a drive mechanism in a state where the take-up reel base is driven.
【図５】首振りレバーの回動途上の駆動機構の平面図で
ある。FIG. 5 is a plan view of a drive mechanism in the process of turning the swing lever.
(１) 供給リール台 (２) 巻取リール台 (３) 首振りレバー (３) 駆動ギヤー (41) 第１ギヤ (42) 第２ギヤ (43) 第３ギヤ (44) 第４ギヤ (５) 第１スリップ機構 (６) 第２スリップ機構 (1) Supply reel table (2) Take-up reel table (3) Swing lever (3) Drive gear (41) First gear (42) Second gear (43) Third gear (44) Fourth gear (5 ) First slip mechanism (6) Second slip mechanism
Claims (1)
の間に首振りレバー(２)を回動可能に配備し、レバー
(２)の回転支点軸(21)と同心に上下２段に第１、第２ギ
ヤ(41)(42)を互いに独立して回転可能に配備し、両ギヤ
(41)(42)間に、一定以上の負荷が作用すればスリップす
る第１スリップ機構(５)を介在させ、レバー(２)の自由
端に前記第２ギヤ(42)に噛合し且つ供給リール台(１)と
巻取リール台(11)に選択的に噛合可能な第３ギヤ(43)を
枢支し、第１、第２ギヤ(41)(42)に選択的に駆動ギヤ
(３)を噛合し、駆動ギヤ(３)の回転方向の切換えによっ
てレバー(２)を首振りさせ、第３ギヤ(43)を何れか一方
のリール台に噛合せしめてリール台を回転駆動する駆動
装置に於て、第３ギヤ(43)と同軸に第４ギヤ(44)を回転
自由に配備して第１ギヤ(41)に噛合し、第３ギヤ(47)と
第４ギヤ(44)との間に、一定以上の負荷が作用するとス
リップする第２スリップ機構(６)を介在させ、第１ギヤ
(41)から第４ギヤ(44)に対する減速比よりも、第２ギヤ
(42)から第３ギヤ(43)に対する減速比の方が大きく、
又、第２スリップ機構(６)のスリップトルクよりも第１
スリップトルクが大であることを特徴とする首振りレバ
ー式リール台駆動装置。A swing lever (2) is rotatably provided between a supply reel table (1) and a take-up reel table (11).
The first and second gears (41) and (42) are arranged rotatably independently of each other in two upper and lower stages concentrically with the rotation fulcrum shaft (21) of (2).
(41) A first slip mechanism (5) that slips when a load exceeding a certain level acts between the second gear (42) and the second gear (42) is engaged with the free end of the lever (2). A third gear (43) that can selectively mesh with the reel base (1) and the take-up reel base (11) is pivotally supported, and a driving gear is selectively connected to the first and second gears (41) and (42).
(3) is engaged, the lever (2) is swung by switching the direction of rotation of the drive gear (3), and the third gear (43) is engaged with one of the reel bases, and the reel base is rotationally driven. In the driving device, a fourth gear (44) is rotatably disposed coaxially with the third gear (43), meshes with the first gear (41), and the third gear (47) and the fourth gear (44). ), A second slip mechanism (6) that slips when a load exceeding a certain level acts on the first gear.
From the reduction ratio of (41) to the fourth gear (44),
The reduction ratio from (42) to the third gear (43) is larger,
Also, the first torque is smaller than the slip torque of the second slip mechanism (6).
A swing lever type reel stand drive device characterized by a large slip torque.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3093159A JP2983681B2 (en) | 1991-03-28 | 1991-03-28 | Swing lever type reel base drive mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3093159A JP2983681B2 (en) | 1991-03-28 | 1991-03-28 | Swing lever type reel base drive mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04301251A JPH04301251A (en) | 1992-10-23 |
| JP2983681B2 true JP2983681B2 (en) | 1999-11-29 |
Family
ID=14074774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3093159A Expired - Fee Related JP2983681B2 (en) | 1991-03-28 | 1991-03-28 | Swing lever type reel base drive mechanism |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2983681B2 (en) |
-
1991
- 1991-03-28 JP JP3093159A patent/JP2983681B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04301251A (en) | 1992-10-23 |
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|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19990831 |
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| LAPS | Cancellation because of no payment of annual fees |