JPS6227461B2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) This invention relates to a video tape recorder (hereinafter referred to as
This invention relates to a reel stand drive device for devices such as VTRs.

(Prior Art) Conventionally, in a VTR, a plurality of rotating bodies and a plurality of positioning members are provided in order to drive a supply reel stand and a take-up reel stand, and each positioning member controls the corresponding rotating body. The reel stand was driven by bringing it into contact with the reel stand.

However, such a configuration has a problem in that the configuration of the reel stand driving device is complicated.

(Problems to be Solved by the Invention) As described above, the conventional reel stand driving device has a problem in that the configuration is complicated.

Therefore, an object of the present invention is to provide a reel stand drive device with a simple configuration.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a supply and take-up reel stand, a motor for driving the reel stand, and a motor for driving the reel stand. A first rotating body that is rotationally driven by a rotor and has a rotary shaft movably disposed, and a first rotary body that is rotationally driven by this first rotary body and whose rotary shaft is a rotary shaft of the first rotary body. A second rotary body disposed so as to be movable independently, and a rotary shaft of one of the first and second rotary bodies selectively fixed and the other rotary shaft movable. and one rotary positioning member that can be switched to the rotary positioning member, and the rotational force of the rotary body whose rotary shaft is movably set by the rotary shaft positioning member is controlled by the rotational direction of the reel stand drive motor. The signal is transmitted to one of the supply and take-up reel stands.

(Function) According to the above configuration, by operating one rotating shaft positioning member, one of the two rotating bodies is set so that the rotating shaft is movable, and the rotating shaft of the other is fixed. Therefore, it is possible to drive one of the two rotary bodies by simply operating one rotary shaft positioning member.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1a is a plan view of the reel stand driving device viewed from above, and FIG. 1b is a sectional view viewed from the side. Hereinafter, the configuration of the reel stand drive device shown in FIGS. 1a and 1b will be explained with reference to FIGS. 2a, b, and c. In addition, in FIG. 1 a, b and FIG. 2 a, b, c, the same parts are given the same reference numerals.

First, explanation will be given with reference to FIG. 2a. 40
0 is the reel drive chassis. A reel motor 401 is disposed on the lower surface of this reel drive chassis 400. This reel motor 40
1 rotation shaft 402 is the reel drive chassis 40
0, that is, in the direction of arrow a7 in the figure. An idle slide holder 403 is disposed on the upper surface of the reel drive chassis 400 so as to be rotatable in the direction of arrows a5←→a6 in the figure with the rotating shaft 402 as a pivot axis. On the top surface of this idle slide holder 403, the idle slider 4
04 is arranged. This idle slider 4
04 is engaged with the rotary shaft 402 through a long hole 405, thereby being able to freely slide in the direction of arrow a2←→a4 in the figure. Normally, it is urged in the direction of arrow a2 by a spring 406. In addition, the idle slider 404 has
A post 407 is provided that protrudes in the direction of arrow a7 in the figure. Further, a reel motor pulley 409 is attached to the rotating shaft 402 with a push screw 408.

Next, a description will be given with reference to FIG. 2b. On the upper surface of the reel drive chassis 400, there are left and right arrows a1←→a with respect to line 1 passing through the rotating shaft 402 in the direction of the illustrated arrow a2←→a4.
A slider 410 having wing pieces 411 and 412 that are symmetrical in three directions is arranged so as to be slidable in the direction of arrows a2←→a4 shown in the figure. This slider 410 includes a post position guide section and a brake lever position guide section 417.
is formed. This post position guide part 413
A through hole 414 is formed approximately in the center of the slider 410, and from this through hole 414, a line 1 is further formed.
It consists of cuts 415, 416 extending along.
Further, the brake lever position guide portion 417 is provided on a part of the outer circumferential surface of each wing piece 411, 412 with an arrow a1←→
It is formed into a substantially sinusoidal wave shape that oscillates in the a3 direction. Moreover, this slider 410 usually has springs 418 and 418 provided on each wing piece 411 and 412, respectively.
419 in the direction of arrow a4 in the figure.

The reel drive chassis 400 further includes main brake levers 420 and 421 of the reel stand, which are approximately L-shaped and serve as main brakes of the reel stand, symmetrically with respect to the line 1 and indicated by arrows a5←→
It is arranged so as to be rotatable in the a6 direction. One piece of the brake levers 420, 421 extends substantially away from each other, and rubber tires 422, 423 are rotatably attached to the ends thereof, respectively. Further, the other piece of each brake lever 420, 421 extends above the slider 410 substantially along line 1, and the lower surface of the end thereof is provided with the brake lever position guide portion 417. rollers 424, 4 respectively engaged with
25 are provided. A spring 426 is stretched between such brake levers 420, 421, and each brake lever 420, 421 is
Normally, they are biased in the directions of arrows a5 and a6 shown in the figure, respectively.

Next, a description will be given with reference to FIG. 2c. An idle wheel gear 427 is rotatably supported on the post 407 in the direction of arrow a5←→a6 in the figure. A toothed surface 428 is formed on the outer circumferential surface of the upper end of the idle wheel gear 427, and a rubber tire 429 is attached to the outer circumferential surface of the lower end. The rubber tire 429 is pressed against the reel motor pulley 409 by the idle slider 404 being biased in the direction of arrow a2 by the spring 406 as described above.

An idle holder 430 is further supported on the post 407 so as to be rotatable in the direction of arrow a5←→a6 in the figure. An idle felt 431 is interposed on the lower surface of this idle holder 430 with the post 435 as a fulcrum shaft, and the idle gear 43
2 is arranged rotatably in the direction of arrow a5←→a6 shown in the figure. The toothed surface 43 of this idle gear 432
3 is the toothed surface 42 of the idle wheel gear 427
8 is engaged. In addition, the idle gear 432
is caused by the spring 434 to always move the illustrated arrow a7
biased in the direction.

In such a configuration, if the slider 410 is slid in the direction of arrow a4 in the figure, the post 407 will be positioned in the notch 415, and the post 435 will be positioned in the through hole 4.
It will be located at 14. In this case, if the rotation direction of the rotation shaft 402 of the reel motor 401 is set in the direction of arrow a6, the idle holder 430
automatically rotates in the direction of arrow a5 in the figure, and the reel gear of the take-up reel stand device (see FIG. 4, which will be described later) is driven by the idle gear 432, and the recording and playback modes are set. On the other hand, if the rotational direction of the rotating shaft 402 is set in the direction of the arrow a5 shown in the figure, the idle holder 430 automatically rotates in the direction of the arrow a6 shown in the figure, and the idle gear 432 causes the supply reel stand device (see FIG. 4 described later). ) is driven and the reverse playback mode is set.

Further, by sliding the slider 410 in the direction of arrow a2 shown in the figure, the post 407 is positioned in the through hole 414, and the post 435 is positioned in the notch 416. Therefore, in this case, the idle slide holder 403 automatically rotates in the direction of the arrow a5 or arrow a6 in accordance with the rotation direction of the reel motor pulley 409, and the rubber tire 429
The reel stand wheel at the take-up reel stand position or the reel stand wheel of the supply reel stand device is rotationally driven by the fast forward mode, respectively.
Rewind mode is set. In addition, the slider 41
0 as shown in FIG. 2b, the posts 407 and 435 each have a notch
5,416, and a stop mode is set in which neither the take-up reel stand device nor the supply reel stand device is driven.

3a, b, and c show a VTR using the above-mentioned reel stand drive device. In the illustrated VTR, slider 410 is operated by detect arm 78 and cam arm 180.

That is, as shown in FIG. 3a, when the loading disc 11 is set at the loading start position, the cam arm 180 is at the rotation angle position shown, and the slider 410 is at the cam arm 1 position.
The position is regulated by 80. In this case, the posts 407 and 435 are engaged with the notches 415 and 416, so that the idle slide holder 403 and the idle holder 430 cannot rotate. Further, the brake levers 420 and 421 are positioned such that their rubber tires 422 and 423 are in pressure contact with the reel stand wheels 306 and 316 of the reel stand apparatuses B and A, respectively.

FIG. 3b shows the state when the loading disk 11 is set at the loading end position. In this case as well, the cam arm 180 is in the rotational angular position shown, and the slider 410 is set by the cam arm 180 to the same position as in FIG. 3a.

FIG. 3c shows the loading disk 11 in a loading or unloading operation. In this case, the roller clutch 81 rides on the cam surface 20 and the detect arm 78 is rotated in the direction of arrow a5 in the figure, so that the slider 410 is slid in the direction of arrow a2 in the figure. As a result, the post 407 has a notch 415
is removed from the post 4 and positioned in the through hole 414.
35 is positioned as it is in the notch 416.
For this reason, the idle slide holder 403 is allowed to rotate in the direction of the arrow a5←→a6 shown in the figure. In this case, since there is no need to drive the reel stand devices A and B during loading, the reel motor 401 does not rotate and the idle wheel gear 427 is positioned at the position shown by the solid line in the figure. On the other hand, during unloading, it is necessary to drive the take-up reel stand device B in the direction of arrow a6 in the figure. Therefore, the reel motor 401 is rotationally driven in the direction of arrow a6 in the figure, and the idle wheel gear 427 is rotated in the direction of arrow a5 in the figure by the reel motor pulley 409. At this time, the idle slide holder 403 is also automatically rotated in the direction of arrow a5 in the figure, so the reel stand wheel 306 of the take-up reel stand device B is rotationally driven in the direction of arrow a6 in the figure by the idle wheel gear 427. . As a result, the magnetic tape that has been pulled out from the cassette is wound onto the take-up reel stand.

By the way, in the loading mode, the reel stand device A,
It is necessary to completely release the main brake of B, and to configure the main brake so that it is fully applied at the moment loading is completed. This is because if the main brake is applied before loading is finished, the tape tension will increase.
This is because there is a risk of damaging the magnetic tape. Further, if it takes some time after loading is completed until the main brake is fully applied, the tape may become slack.

Therefore, in the configuration in which the main brakes of the reel stand devices A and B are controlled using the cam surface 20 as described above, the roller clutch 81 is disengaged from the cam surface 21 at the loading end position.
It is necessary to set the position of the end of the cam surface 21 in the direction of arrow a5. Moreover, in this case, in order to ensure that the main brake is fully applied immediately upon completion of loading, the cam surface 20 is
It is necessary to form the end portions in five directions to have steep slopes.

However, if the end portion of the cam surface 20 in the direction of the arrow a5 is steeply sloped in this way, there is a problem that the load on the loading motor increases when unloading is started. Figures 4a and 4b show configurations for dealing with this problem. That is, as shown in FIGS. 4a and 4b, the illustrated arrow a5 of the cam surface 20
The directional end portion is an inclined surface that gently slopes along the direction of arrow a5 in the figure. Further, a variable angle cam 440 that is rotatable in the direction of the arrow a5←→a6 shown in the figure is attached to this end portion. A U-shaped portion 441 is formed at the free end of the variable angle cam 440.

First, FIG. 4a shows a state in which loading has been completed. In this case, the variable angle cam 440 rotates in the direction of arrow A5 in the figure, and is stopped at a position where a line m connecting its tip ends substantially follows the radial direction of the loading disk 11. Therefore, if the position of the variable angle cam 440 is set appropriately, the detect arm 78 will be instantaneously rotated in the direction of arrow a6 when loading is completed. As a result, the main brake is applied to the reel stand devices A and B instantly when loading is completed.

FIG. 4b is a diagram showing the state at the start of loading. In this case, since the roller clutch 81 rides on the cam surface 20 along the inclined surface of the cam surface 20, a large load is not applied to the loading motor at the beginning of unloading. in this case. Since the variable angle cam 440 is pushed by the roller clutch 81 and rotates in the direction of arrow a6 in the figure, there is no obstacle to the roller clutch 81 riding on the cam surface 20.

Incidentally, in order to prepare for the loading operation by rotating the variable angle cam 440 in the direction of arrow a6 shown in the figure in the direction of arrow a5 in the figure and setting it in the state shown in FIG. Square cam 44
0 may be biased in the direction of arrow a5 in the figure by a spring 442, a coil spring, or the like. Moreover, without using such a biasing means,
Due to the reaction when the loading disc 11 starts rotating in the direction of arrow a6, the variable angle cam 4
It may also be possible to utilize the fact that 40 rotates in the direction of arrow a5 in the figure. The variable angle cam 440 rotated in the direction of the arrow a5 in the figure comes into contact with the stopper 443 and stops, and is positioned in the state shown in FIG. 4a.

Note that the variable angle means is not limited to the above-mentioned cam 440, but may be a floating means using a leaf spring, for example.

In this way, the idle wheel gear 427 and the idle gear 432 are arranged so that the rotating shafts can move independently, and the rotating shaft of either the idle wheel gear 427 or the idle gear 432 is fixed by operating the slider 410. , selectively switches the other rotating shaft to be movable, and reel motor 4
The idle wheel gear 427 (or idle gear 432) whose rotation axis is set to be movable according to the rotation direction of the take-up reel table device A or the supply reel table device B is driven by the idle wheel gear 427 (or idle gear 432). be. In other words, since the configuration is such that various modes of the VTR can be set with one positioning member, the apparatus can be significantly simplified compared to the conventional configuration in which multiple rotating bodies are driven by multiple positioning members.

In addition, by having two drive systems: a low-speed feed system for recording and playback, and a high-speed feed system for fast forward and rewind, there is an advantage that the rotation speed of the reel motor 401 can be set to the most efficient value. .

In addition, in the state shown in Fig. 2b, the brake lever 4
Tires 422 and 423 of No. 20 and 421 are the reel stand wheels 306 of the corresponding reel stand devices A and B, respectively.
, and restricts the rotation of the reel stand devices A and B. Furthermore, if the slider 410 is further slid in the direction of the arrow a2 or the direction of the arrow a4 in the figure from this state, the brake levers 420, 421
are rotated in the directions of arrows a6 and a5 shown in the figure, respectively, and the comb tires 422 and 423 are separated from the reel stand wheels 306 of the corresponding reel stand devices A and B, respectively. Since the function of the main brake operating member is added to the slider 410 in this way, there is an advantage that there is no need for a separate operating member exclusively for the main brake.

Note that the positioning member is not limited to a slider type, and may be of a rotation type or rotation type, for example, and the point is that by rotating or rotating the positioning member, the idle wheel gear 42
7. Any configuration may be used as long as the rotation axis of one of the two rotation bodies such as the idle gear 435 is fixed and the rotation axis of the other rotation body is movable.

[Effects of the Invention] As described above, according to the present invention, it is possible to provide a reel stand drive device with a simple configuration.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of an embodiment of the present invention;
FIG. 2 is a diagram for explaining the operation of the device shown in FIG. 1, and FIGS. 3 and 4 are diagrams showing an example of the device.
FIG. 2 is a diagram shown to explain an example of application to a VTR. A... Supply reel stand device, B... Take-up reel stand device, L... Reel stand drive device, 4
10...Sliding data, 427...Idle wheel gear, 432...Idle gear.

Claims (1)

[Scope of Claims] 1. A supply and take-up reel stand, a motor for driving the reel stand, and a first motor rotatably driven by the motor for driving the reel stand and having a rotary shaft movably disposed. a second rotating body which is rotationally driven by the first rotating body and whose rotating shaft is movable independently of the rotating shaft of the first rotating body; a rotary positioning member that can be selectively switched between fixing one of the rotary shafts of the first and second rotary bodies and making the other rotary shaft movable; The rotational force of a rotating body whose rotating shaft is movably set by a member is transmitted to one of the reel stands of the supply and take-up reel stands depending on the rotational direction of the reel stand driving motor. A reel stand driving device characterized in that it is configured as follows.