JPS6244Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is a videotape recorder (hereinafter referred to as VTR).
This invention relates to a tension post control device.

In a VTR, when a cassette is loaded, the tape is automatically pulled out from within the cassette and wound around a cylinder provided with a rotating head. Figure 1 is a VTR
This figure shows the loading structure of the present invention, in which numeral 11 is a ring-shaped loading disk. This loading disk 11 is rotatably attached at its inner peripheral edge by guide rollers 12, 13, and 14. A toothed surface is formed on the outer periphery of the loading disk 11, and a gear 15 meshes with the toothed surface. This gear 15 is rotationally driven by a motor 16 via a wavy gear. The motor 16 is loaded with the cassette 17.
When the VTR is in the tape pulling state, the loading disk is rotated in the direction of arrow A in the figure. Further, the motor 16 rotates the loading disk 11 in the direction of arrow B in the figure when an eject operation of the VTR is performed. In the state shown in FIG. 1, the tape 18 is pulled out, and this tape 18
is guided along its travel path by a guide post or the like provided upright on the upper rotating surface of the loading disk 11.

That is, on the rotating surface of the loading disk 11, there are guide posts 19 ₁ , 19 ₂ , 19 ₃ , 1
9 ₄ , 19 ₅ , etc. are provided standing up. Further, a pinch roller 20 is arranged between the guide posts 19 ₁ and 19 ₂ . This pinch roller 20 is rotatable in the direction of the arrow (C←→D) shown in the figure by a pinch roller alarm 21.

Next, a cylinder 21 containing a rotary head is provided at an eccentric position on the inner circumference of the loading disk 11. Furthermore, along the tape running path, a tension lever 23 having a tension post 22 at its rotation end, a magnetic head 24 for erasing, and a magnetic head 2 for audio/control signals are installed.
5 is provided. Furthermore, a tape guide post 2 for guiding the tape on the tape running path is provided.
6, 27, 28, 29, 30, etc. are also provided. A capstan 31 is also provided that corresponds to the pinch roller 20 when it rotates to a predetermined position.

In the state shown in FIG. 1, the cassette 17 is loaded into the VTR, the loading disk 11 hooks the tape in the cassette onto the guide post ₁₉₁ , rotates in the direction of arrow A in the figure, and loading is completed. At this time, the pinch roller 20 is driven by the pinch roller control device in the direction of arrow D in the figure during playback or recording, and is brought into pressure contact with the capstan 31. Further, when the VTR is ejected, the loading disk 11 is rotated by the motor in the direction of arrow B from the illustrated state. At this time, the tape 18 is
It is rolled up to the second side.

Also, when loading is complete, guide post 1
9 ₁ , 19 ₂ , the process ends when the pinch rollers 20 and the like have just reached the tape pull-out portion 17 ₁ at the bottom of the cassette 17 . At this time, the tension lever 23 is rotated by the control mechanism in the direction of arrow F in the figure, moves to the lower part of the tape drawer 17, and stores the tape in the cassette 17. Note that 33 is a take-up reel stand.

In the above VTR, when recording or playing,
The tension lever 23 is pulled in the direction of arrow E in the figure by a spring, and rotates to a position balanced with the tension exerted by the tape 18.

That is, the relationship among the tension lever 23, tension post 26, supply reel stand 32, etc. is as shown in FIG. The rotation end of the tension lever 23 is rotatable about the shaft 40 in the direction toward and away from the supply reel stand 32. One end of a belt-shaped band brake 41 is attached to the rotation end of the tension lever 23. This band brake 41 is wound half around the supply reel stand 32 and the other end is fixed to the chassis. In addition, the tension lever 23 is
A biasing force is applied by the spring 42 in the direction of arrow E in the figure. Furthermore, a tension lever control member 4 is provided at the base end of the tension lever 23.
3 is provided, and this control member 43 also has a shaft 40
It is rotatably supported by. A drive piece ₄₃₁ is formed at a part of the rotation end of the tension lever control member 43. This driving piece ₄₃₁ is the driven part 23 of the tension lever 23.
₁ , and the tension lever 23 can be rotated in the direction of arrow F in the figure. The control member 43 is associated with the VTR's recording, playback, fast forward, rewind, cue, and review controls, and the like.

The state shown in FIG. 2 is the state during fast forwarding or rewinding. Further, in a recording or reproducing state, the control member 43 is rotated in the direction of arrow E in the figure, and the tension lever 23 is moved to a position P ₁ shown by a substantially broken line to apply tension to the tape 18 . here tape 1
When tape 8 becomes loose, the tension lever 23 is pulled by the spring 42 and further rotates in the direction of arrow E in the figure, operating to maintain the tape tension. Further, the band brake 41 applies a brake to the supply reel stand 32. Next, the VTR
When is operated to fast forward or rewind, the control member 43 drives the tension lever 23 in the direction of arrow F in the figure, forcing it to move to position _P2 as shown by the solid line. Therefore, the tension lever 23
is restricted from rotating in the direction of arrow E in the figure. However, it is free to rotate in the direction of arrow F in the figure against the force of the spring 42. As described above,
The reason why the tension lever 23 is rotated to the position _P2 when the VTR is in fast forward or rewind mode is as follows. During fast forwarding or rewinding, the tape is run at high speed, so the winding range between the cylinder and the tape is reduced to reduce the load as much as possible. Furthermore, the braking force from the band brake 41 is reliably prevented from being applied to the supply reel stand 32. For these reasons, tension lever 2
3 is moved to the position P ₂ shown.

The tension post control structure described above has the following drawbacks. That is, if some load is generated while the tape 18 is being fast-forwarded or rewound, the tape tension becomes stronger. For this reason, the tension post 22 is
It swings between the illustrated positions P ₂ and P ₃ .

As described above, when the tension post 22 swings, the relationship between the cylinder 21 and the tape 18 becomes as shown in FIG. 3, and the horizontal and vertical positions of the tape running path become unstable. This is because VTRs use helical scanning, so the tape is wound around the cylinder shaft in a spiral direction. As a result, when the tape swings, the phenomenon shown in FIGS. 4 and 5 occurs for the guide post 26 in this vicinity. That is, the tape 18 swings in a direction away from or toward the guide post 26 and also swings in the tape width direction. Therefore, the edge of the tape 18 is the guide post 26.
Touching the stepped guide part 26 ₁ deforms it,
It becomes what is called a wakame-like shape. Furthermore, on the reel stand on the winding side, the tape is wound in stages, making the tape winding state messy. If the tape is wound in stages, a frictional noise may occur between the inner surface of the cassette and the edge of the tape, and the unloading load during tape feeding may become unstable. When the above phenomenon occurs, it is inevitable that the tape will be damaged and the control signal and synchronization signal will be disturbed. Furthermore, when the tension lever 23 is rotated more than necessary in the direction of arrow F in the queue and review, the tape winding angle around the cylinder 21 becomes insufficient, making it impossible to pick up the video signal.

This idea was made in view of the above circumstances, and is a video tape recorder that can further stabilize the tape running path, prevent damage and deformation of the tape, and achieve a high degree of reliability in signal recording and playback. The purpose of the present invention is to provide a tension post control device.

An embodiment of this invention will be described below with reference to FIGS. 6 to 11.

In FIG. 6, 50 is a tension lever, and a tension post 51 is attached to its rotating tip. The fulcrum portion is supported by a shaft 52 so as to be rotatable in the direction of the arrow (E←→F) shown in the figure. Furthermore, this tension lever 50
The rotating end side thereof is pulled in the direction of arrow E in the figure by a spring 53.

Next, at the base end of the tension lever 50,
A driven portion ₅₀₁ for driving the tension lever in the direction of arrow F in the figure is integrally formed. Further, a driving member 54 corresponding to the driven portion ₅₀₁ is provided, and this is also rotatably attached to the shaft 52. The driving portion 54 ₁ of the driving member 54 and the driven portion 50 of the tension lever 50
₁ are facing each other. A portion of the drive member 54 is also associated with a VTR's fast-forward, rewind, record, playback, queue, and review controls, etc. of the VTR.

Next, a position regulating section 55 is further integrally formed on the rotating section of the tension lever 50. This position regulating portion 55 has an integral locking piece ₅₅₁ bent toward the lower part of the lever at its rotating tip.

The tension lever 50 includes a fast-forward operator,
When the rewind, cue, and review buttons are operated, the control is performed to the state shown in FIG. 6.
Further, when the recording/playback operator is operated, the control is performed to the state shown in FIG. 7, and when loading is completed at the time of eject and just before loading is started, the control is performed to the state shown in FIG. 8. Furthermore, 56
is a cylinder as shown in FIG. 1, and 57 is a guide post.

Next, the VTR is provided with a lock plate 58 for locking operations. As shown in FIG. 9, this lock plate 58 has a plurality of through holes 58 ₁ , 58 _{2 ,} etc. provided corresponding to various types of operators. That is, the lock plate 58 is disposed with its plane perpendicular to the rotating surface of the tension lever 50 downward, and is slidable in the direction of the arrow (G←→H) shown in the figure. And this lock plate 5
The through holes 58 ₁ and 58 ₂ of No. 8 are formed in a rectangular shape that is elongated in the sliding direction. Furthermore, the through hole 58 ₁ ,
Operators 61 and 62 pass through the lock plate ₅₈₂ so as to be perpendicular to the lock plate 58. Operator 6
1, 62, etc. are slidable in the direction of the illustrated arrow (I←→J). However, each of the operators 61 and 62 has locking portions ₆₁ 1 and 62 1 that can be locked in the through holes 58 ₁ and 58 ₂ when sliding in the direction of the arrow shown in the figure with respect to the through holes 58 ₁ and 58 ₂ , _respectively . are formed respectively. The controls 61, 62, etc. are connected to the lock plate 5.
When 8 is sliding in the direction of arrow G in the illustration,
The locking parts 61 ₁ , 62 ₁ are through holes 58 ₁ , 58 ₂
The robot collides with the robot, and operation movement in the direction of the arrow shown in the figure is locked. (See FIG. 11) Furthermore, at the end of the lock plate 58, a stopper member 63 is provided at a portion corresponding to the position regulating portion 55 of the tension lever 50, which is rotatable in the direction of the arrow (K←→L). It is attached by a shaft 64. This stopper member 63 is normally biased in the direction of arrow K in the figure by a spring (not shown). And its rotational steady position is
It is regulated by a claw ₅₈₃ formed in a notch in the lock plate 58.

According to this invented device described above, when the loading of the VTR is completed, the tension lever 50 is pulled in the direction of the arrow E in the figure by the spring 53;
And when the balance with the tape tension is achieved,
The result is as shown in FIG. In this situation,
VTR recording and playback operations are performed. next,
When the VTR is put into the rewind or playback mode, the drive member 54 rotates the tension lever 50 in the direction of the arrow F in the figure in conjunction with the operator, so that the tension lever 50 is positioned exactly as shown in FIG. 6. . At this time, the regulating member 55 of the tension lever 50 collides with the stopper member 63, and its rotation in the direction of arrow F in the figure is restricted. Also, at this time, the tension lever 50
The rotation in the direction of arrow E in the figure is also restricted by the drive member 54.

As a result of the above, in the fast forwarding or rewinding state, the tension lever 50 is moved in the direction of the arrow F in the figure, and in the direction of the arrow E.
Rotation in this direction will be locked in the state shown in FIG. Further, the position of the tension post 51 at this time is selected so that the tape TP does not come off from the tape guide portion of the guide post 57.
Therefore, unlike the conventional device described in FIG. 2, the tension lever 50 does not swing in the direction of the illustrated arrow (E←→F). For this reason, the tape running path is always maintained in a stable position during rewinding and fast forwarding, so the tape edge is not pressed against the stepped part of the guide post and is not separated from it as in the conventional case, which can cause tape deformation or damage. Never. Furthermore, since the tape running position is stabilized, the tape is not wound in stages on the supply reel stand, resulting in a well-organized and good winding state. Therefore, there is no large change in friction between the edge of the tape and the inner wall of the cassette, and the winding load is kept constant, contributing to improved signal quality during recording and playback. Furthermore, since the range of tape winding around the cylinder is maintained stably during queue and review, this can contribute to the full performance of the queue and review functions.

Next, in the present invention, the tension lever 5
A stopper member 63 provided on the lock plate 58, a regulating member of the tension lever 50, etc. are used as means for regulating the rotation of the tensioner 0 in the direction of the arrow F in the figure. By configuring this regulating means, the following effects can be obtained.

In other words, when a cassette is loaded into a VTR, the loading disk starts rotating to pull out the tape due to the cassette detection device. At this time, the lock plate 58 has been slid to the position shown in FIG. 11, and a spring tension is applied in the direction of arrow G in the figure. When the loading disk completes loading and stops at a predetermined position, the locking plate 58 is pulled by a plunger or the like in the direction of arrow H by the loading completion detection device and slides (see FIG. 9). In other words, the lock plate 58 allows the recording and playback controls to be operated only when loading is completed.

On the other hand, in the tension lever 50, as soon as loading is started, the drive member 54 is released in the direction of arrow E in the figure, and the biasing force of the spring 53 is applied.

However, when loading started,
If there is no remaining tape on the supply reel stand side, a large amount of tape tension will be applied, which may cause the tape to rotate to the state shown in FIG. 11 and stop at this position. When the tension lever 50 is in the state shown in FIG. 11, the tape is inevitably pulled out from the other take-up reel stand, and loading is completed. At this time, the lock plate 58 is slid from the state shown in FIG. 11 in the direction of arrow H in the figure, and becomes the state shown in FIG. Here, the stopper member 63
Therefore, the rotation function becomes necessary. 9th
As shown in the figure, the stopper member 63 is located at the arrow L shown in the figure.
This allows the lock plate 58 to slide in the direction of arrow H in the figure. In this state, since the VTR is rewound, the tape becomes loose and the tension lever 50 shifts to the state shown in FIG. Then, its rotational position is regulated.

Therefore, as described above, according to the present invention, since the movement of the lock plate 58 is utilized as a means for regulating the rotation of the tension lever 50, the regulating action can be reliably obtained. In other words, you can only get it reliably if you can operate the VCR. However, if a locking plate is used, a problem may occur if there is not enough tape remaining on the supply reel stand side during loading, so this problem can be solved by the movement of the stopper member 65. .

As explained above, this invention provides tension post control for video tape recorders that can further stabilize the tape running path, prevent damage and deformation of the tape, and achieve a high degree of reliability in signal recording and playback. equipment can be provided.

[Brief explanation of the drawing]

FIG. 1 is a diagram schematically illustrating the configuration of a video tape recorder, FIG. 2 is a diagram illustrating the configuration of a conventional tension post control device, FIG. 3 is a diagram illustrating the relationship between a cylinder and a tape, and FIG. FIG. 5 is an explanatory diagram showing the relationship between the tape guided by the device of FIG. 2 and the guide post, and FIGS. 6, 7, and 8 each show a video tape according to an embodiment of the invention. Plan views showing each operation mode of the tension post control device of the recorder, Fig. 9, Fig. 10, Fig. 1
FIG. 1 is also a perspective view showing each operation mode of the device of this invention. 50... Tension lever, 51... Tension post, 53... Spring, 54... Drive member, 55... Regulation member, 56... Cylinder, 57
...Guide post, 58...Lock plate, 63...
Stopper member.

Claims (1)

[Claims for Utility Model Registration] It is rotatably supported by a shaft on the chassis of the video tape recorder, and has a tension post on the upper surface of its rotating end, which is attached to the cassette of the video tape recorder. It is rotatably movable between a first position serving as a cassette drawer in the mounting section and a second position close to the rotary head cylinder inside the loading disk, and tension by a spring is applied in the direction of the second position. and a tension lever provided on the side of the first position and below the rotating surface of the tension lever, and configured to move in the first direction when the loading disk comes to a predetermined position where loading is completed. In a control device for a video tape recorder, the control device includes a lock plate that is slide-controlled to enable operation of an operator of the video tape recorder, wherein a part of the rotating portion of the tension lever is integrated with the tension lever. is formed to rotate,
a regulating member whose tip extends toward the locking plate; the regulating member is attached to the locking plate so as to have an elastic force in a certain direction (the first direction) so as to correspond to the rotational trajectory of the regulating member; When the lock plate is in the position where it slides in the first direction, it can be locked onto the tip of the regulating member, and prevents the tension lever from rotating toward the first position, thereby preventing the tension lever from rotating toward the first position. a stopper member capable of setting a third position of the tension lever; and a stopper member that presses and rotates the tension lever toward the first position in conjunction with a tape high-speed feed operator of the video tape recorder; A video tape recorder comprising: a drive member that locks into a third position; and when the tension lever is in the third position, the positional relationship between the running tape path and the guide post is maintained. tension post control device.