JPH1011842A - Magnetic recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the cost by remarkably reducing the number of components, to prevent a magnetic tape from sagging by applying stable braking load to a reel base and to prevent the occurence of the tape damage in a magnetic recording/reproducing device. SOLUTION: This device is provided with a 1st holding member 12 for holding one end of a tension band 11, a 2nd holding member 102 having a cam surface while holding another end of the tension band 11, a tension arm 9, an extension coil spring 16 capable of freely adjusting the tape tension of the magnetic tape 5 to a required value, and an elastic force adjusting member 10 capable of freely abutting or separating against the cam surface of the 2nd holding member 102. By abutting the elastic force adjusting member 101 on the cam surface of the 2nd holding member 13 at the time of cassette mounting operation and in the process of loading operation, the magnetic tape is prevented from sagging, then the occurence of tape damage is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus characterized by providing a mechanism capable of greatly reducing the number of components in a video tape recorder, a digital audio tape recorder, or the like.

[0002]

2. Description of the Related Art FIG. 5 is a plan view showing a schematic configuration of a conventional magnetic recording / reproducing apparatus used for a video tape recorder (hereinafter, referred to as a VTR). FIG. 6 is an explanatory diagram when the cassette is mounted, that is, when the loading operation of the magnetic tape is started. First, the overall configuration will be described with reference to the drawings. In this figure, a capstan motor 1 is a drive source of a take-up reel base 3 and a supply-side reel base 4.
Both ends of the magnetic tape 5 are wound around two reels provided on the tape cassette 2. When the tape cassette 2 is mounted on the VTR, the magnetic tape 5 is pulled out by a mechanism (not shown), wound around the cylinder 6, and the loading is completed. The magnetic tape 5 is sandwiched between the capstan shaft 7 and the pinch roller 8 at the time of reproduction or reverse reproduction, and travels with the pinch roller 8 separated from the capstan shaft 7 at the time of rewinding or fast-forwarding.

[0003] The running of the magnetic tape 5 is carried out by a capstan shaft 7 and a pinch roller 8 which are rotatably driven while holding the magnetic tape 5. In this case, the magnetic tape 5 has a slack or excessive slack. Appropriate back tension must be applied to avoid tension. In order to apply such back tension to the magnetic tape 5, a tension arm 9 is provided, and a tension band 11 serving as a braking member is provided over a predetermined angle of the winding portion of the supply-side reel base 4, and both ends of the tension band 11 are provided. It is attached to the tension arm 9 via the first and second holding members 12 and 13. The back tension of the magnetic tape 5 must be uniform and appropriate from the beginning to the end of the winding. Such adjustment is performed by adjusting the position of the tension arm 9 or adjusting the contact force of the tension band 11 serving as a braking member of the reel base. Can be done.

Next, the configuration of the actual back tension adjusting mechanism for the magnetic tape 5 will be described with reference to FIG. The tension arm 9 is rotatably mounted around a first pin 15 press-fitted and fixed to the base 14 as a center of rotation. A tension post 10 serving as a tension detecting member of the magnetic tape 5 is disposed near the tip of the turning radius of the tension arm 9 and is slidably fixed to the running magnetic tape 5. Also, the tension arm 9 has the first
One end of a tension coil spring 16, which is an urging member, is held.

Accordingly, in the tension arm 9, when there is a restoring force of the tension coil spring 16, a rotating couple acts in the direction of arrow A. Both ends of a tension band 11 which is a braking member of the supply side reel base 4 are connected to first and second holding members 12 and 13.
While being held by the tension arm 9, and is wound around the outer peripheral portion of the supply-side reel base 4.

[0006] The tension arm 9 rotates in the direction A until the tension band 11 is no longer slack, and the tension corresponding to the rotation couple of the tension arm 9 acts on the tension band 11. A braking load corresponding to the tension of the tension band 11 is generated on the side reel base 4.

The other end of the tension coil spring 16 as the first urging member is locked by an elastic force adjusting member 17 rotatably disposed on the base 14, so that the urging force of the tension coil spring 16 is maintained. Can be adjusted. The follower 18 is formed integrally with the elastic force adjusting member 17 and is provided on a drive plate 19 which is a guide means for the elastic force adjusting member 17 and is slidably disposed on the base 14 as shown in the figure. The elastic force adjusting member 17 can be rotated in the direction of arrow B or in the direction of arrow C according to the amount of movement of the drive plate 19 by the engagement relationship between the guide portion 20 and the follower 18.

[0008] The second pin 21 is press-fitted and fixed to the base 14, and serves as a rotation center of the brake member 22. One end of a tension coil spring, which is the second biasing member 23, is engaged with the brake member 22, and the restoring force of the tension coil spring causes the brake member 22 to rotate counterclockwise.
When the tension band 11 wound around the supply-side reel base 4 is sandwiched and pressed against the supply-side reel base 4, a braking load is applied to the supply-side reel base 4. When a braking load on the supply-side reel base 4 is not required, the second brake member 22 is separated from the supply-side reel base 4 by a regulating member (not shown) so that the braking load does not act on the reel base 4. It has become.

The detailed operation of the conventional magnetic recording / reproducing apparatus configured as described above will be described with reference to FIGS.

After the tape cassette 2 is mounted, the magnetic tape 5
During the loading operation, the drive plate 19 slides in the direction D, the follower 18 is guided by the guide portion 20 of the drive plate 19, and the elastic force adjusting member 17 moves in the direction of arrow C by the restoring force of the tension coil spring 16. The tension arm 9 is rotated to further increase the restoring force of the tension coil spring 16, and the tension arm 9 rotates in the direction of arrow A, moves from the storage position in the tape cassette, and the tension post 10 contacts the magnetic tape 5. .

Next, when a recording or reproduction mode is set, the driving plate 19 is further driven by a driving means (not shown).
In the direction B until the restoring force of the tension coil spring 16 as the first biasing member is adjusted to a predetermined value, and the predetermined rotational couple acts on the tension arm 9. . Here, when the magnetic tape 5 runs, the contact force of the magnetic tape 5 with respect to the tension post 10 changes according to the tension of the magnetic tape 5, so that the tension arm 9 rotates according to the tension of the magnetic tape 5. And
For this reason, the tightening state of the tension band 11 is changed.

Now, when the tension of the magnetic tape 5 increases,
Since the tension arm 9 rotates clockwise, the tightening of the tension band 11 is loosened, the braking load on the reel base 4 is reduced, and the tension of the magnetic tape 5 is reduced. Contrary to this, when the tension of the magnetic tape 5 decreases, the contact force of the magnetic tape 5 against the tension post 10 decreases, and the restoring force of the tension coil spring 16 causes the tension arm 9 to rotate counterclockwise, and Band 11
The tension adjusting mechanism acts so that the reel base 4 is further tightened, the braking load on the reel base 4 is increased, and the tension of the magnetic tape 5 is increased.

In the tape cassette 2, when the cassette is mounted on the reel bases 3 and 4 while releasing the brake inside the cassette provided so that the magnetic tape does not slack, the brake inside the cassette suddenly increases when the cassette is completely mounted. When released, the unwound magnetic tape 5 deviates outside the tape cassette and largely sags, and the magnetic tape 5 falls from the height regulating member, and no tape damage occurs to the magnetic tape 5 during the loading operation thereafter. During the cassette mounting operation, the regulating member (not shown) is separated from the brake member 22 so that the brake member 2
Reference numeral 2 denotes a rotating couple that is balanced with the restoring force of the tension coil spring as the second urging member 23, whereby the turning radius portion of the brake member 22 comes into contact with the reel base 4, and the brake in the tape cassette is suddenly increased. Even if the magnetic tape 5 is released, a braking load is applied to the reel base 4 to maintain the tape tension when the cassette is mounted, thereby preventing the magnetic tape 5 from dropping from the height regulating member due to slack.

During the loading operation from the time when the cassette is mounted, that is, from the position where the magnetic tape 5 is stored in the tape cassette to the position where recording and reproduction can be performed, the tension post 10 is pulled out.
Until the tape abuts on the magnetic tape 5, the braking band cannot be applied to the reel base 4 because the tension band is in a loose state.

Therefore, the tension of the magnetic tape 5 pulled out from the tape cassette 2 during the loading operation becomes very low. Therefore, during the loading operation, when the magnetic tape 5 comes into contact with the cylinder 6, the magnetic tape 5 falls from the regulating lead surface of the cylinder 6, or when the pull-out speed of the magnetic tape 5 changes during the loading operation. The magnetic tape 5 comes out too much due to the inertia of the rotation of the reel base 4 due to the magnetic tape 5 sent out near the completion of the loading operation, or the magnetic tape 5 is largely slackened. The magnetic tape 5 was damaged due to deviation or so-called tape damage.

Therefore, during the loading operation from when the cassette is mounted to when the loading is completed, similarly to the time when the cassette is mounted, the regulating member (not shown) is separated from the brake member 22, and the brake member 22 is the second biasing member 23. The rotating radius portion of the brake member 22 is brought into contact with the reel base 4 by a rotating couple balanced with the restoring force of the tension coil spring, and a braking load is applied to the reel base 4 to apply a predetermined force to the magnetic tape 5 pulled out. When the magnetic tape 5 comes into contact with the cylinder 6, the magnetic tape 5 may drop from the height regulating member or the reel may fall when the drawing speed of the magnetic tape 5 changes. This prevents the magnetic tape 5 from sagging due to excessive rotation caused by the inertia of the rotation of the table 4.

[0017]

In the conventional magnetic recording / reproducing apparatus having the above-mentioned structure, the restriction read is performed when the magnetic tape pull-out speed changes during the cassette mounting operation or during the loading operation or when the magnetic tape comes into contact with the cylinder. In order to prevent tape damage due to dropping from the surface or slack of the magnetic tape near the completion of loading, a dedicated brake component, namely, a brake arm, a pin serving as a rotation center, and elasticity for a predetermined braking force Many members such as a member spring and a regulating means for regulating the brake arm are required, and there is a problem that the price as a product is increased from the viewpoint of increase in the number of parts and the number of assembly steps.

In addition, when the point of application of the brake becomes point-contact on the reel base and the contact state between the brake member and the reel base becomes unstable, or when the friction coefficient between the brake member and the reel base varies, the braking load is increased. May vary greatly, and in some cases, an excessive braking load may act on the reel base, and as a result, the tape may be loaded with an excessively high tape tension. Since the tape is loaded, tape damage may occur or the operation load may become excessive, which has been a serious problem.

Accordingly, the present invention has been made in view of such conventional problems, and the number of components is greatly reduced, the cost is extremely low, and the reel is stable during a cassette mounting operation or during a loading operation. Give a braking load,
It is an object of the present invention to provide a magnetic recording / reproducing apparatus capable of holding an appropriate tape tension and preventing tape slack during loading and occurrence of tape damage due to excessive tension.

[0020]

SUMMARY OF THE INVENTION In order to solve this problem, the present invention is directed to a reel base for supplying or winding a magnetic tape, a reel wound at a predetermined angle on the reel base, and capable of braking the reel base. A tension band, a first holding member for holding one end of the tension band, a second holding member for holding the other end of the tension band and having a guide portion, and a first and second holding member. A tension detecting member which is movably locked and has a tension detecting member with which the magnetic tape slides in contact when traveling, and which is rotatably supported on a shaft; and one end of which is locked to the tension arm to record or reproduce the magnetic tape A biasing member capable of adjusting the tape tension inside to a desired value, and a contact portion that locks the other end of the biasing member and that can freely contact the guide portion of the second holding member; 2 to the guide of the holding member Alternatively the separable control member,
A first position where the contact portion of the control member can freely contact the guide portion of the second holding member; and a guide means that can be freely guided at a second position where the contact portion is separated from the guide portion of the second holding member. It is characterized by.

A reel base for supplying or winding the magnetic tape, a tension band wound around the reel base at a predetermined angle and capable of braking the reel base, and a first holding member for holding one end of the tension band And a second holding member holding the other end of the tension band, a first and a second holding member rotatably locked, and a tension detecting member with which the magnetic tape slides when running. A tension arm movably supported by a shaft, an urging member having one end locked to the tension arm and capable of adjusting a tape tension during recording or reproduction of the magnetic tape to a desired value, and the other end of the urging member And a control member that has a contact portion that can contact and separate from the tension band, and a control member that can contact or separate from the tension band, and a first member that allows the contact portion of the control member to contact the tension band. Wherein the location, that a freely guiding means guiding the second position to separate from the tension band.

According to the present invention having such features,
Without a dedicated brake member, the control member presses and biases the second holding member by the restoring force of the biasing member even during the cassette mounting operation or during the loading operation of the magnetic tape, that is, during the rotation operation of the tension arm, A predetermined tension can be applied to the tension band and applied to the reel base while changing to a desired braking load.

The control member presses and biases the tension band by the restoring force of the biasing member even during the cassette mounting operation or during the loading operation of the magnetic tape, that is, during the rotation operation of the tension arm, and the predetermined force is applied to the tension band. A desired braking load can be applied to the reel base by applying tension.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a reel base for supplying or winding a magnetic tape, a tension band wound around the reel base at a predetermined angle and capable of braking the reel base. A first holding member that holds one end of the tension band, a second holding member that holds the other end of the tension band, and has a guide portion;
A first and second holding member rotatably locked, and a tension detecting member with which the magnetic tape slides when running;
A tension arm rotatably supported at one end, an urging member having one end locked to the tension arm, and a tape tension member capable of adjusting a tape tension during recording or reproduction of the magnetic tape to a desired value; A control member that locks the other end and has a contact portion that can freely contact the guide portion of the second holding member, and a control member that can contact or separate from the guide portion of the second holding member; A first position in which the contact portion can freely contact the guide portion of the second holding member; and a guide means that can be guided in a second position in which the contact portion is separated from the guide portion of the second holding member. Even during the loading operation of the magnetic tape, that is, during the turning operation of the tension arm, the control member presses and biases the tension band holding member by the restoring force of the biasing member without adding a dedicated brake member, and the tension band is pressed against the tension band. Apply the specified tension and By applying a braking load as necessary to the magnetic table and selectively making the shape of the guide portion of the second holding member appropriate, during the operation of mounting the cassette tape or during the operation of loading the magnetic tape. This has the effect that the required braking load can be changed.

According to a third aspect of the present invention, there is provided a reel base for supplying or winding a magnetic tape, a tension band wound around the reel base at a predetermined angle and capable of braking the supply reel base, A first holding member that holds one end of the band, a second holding member that holds the other end of the tension band, and the first and second holding members are rotatably locked, so that the magnetic tape can be moved during traveling. A tension arm rotatably supported and having a tension detecting member that is in sliding contact with the tension arm; one end of which is locked to the tension arm to adjust the tape tension during recording or reproduction of the magnetic tape to a desired value; A biasing member, a control member that locks the other end of the biasing member, and has a contact portion that can freely contact the tension band, and a control member that can contact or separate from the tension band, and a contact portion of the control member. The A first position that can freely contact the tension band, and a guide that can be guided to a second position that is separated from the tension band, and even during the loading operation of the magnetic tape, that is, during the rotation operation of the tension arm. The control member presses and biases the tension band by the restoring force of the biasing member without adding a dedicated brake member, and applies a predetermined braking load to the reel base by applying a predetermined tension to the tension band. Has the effect of being able to.

An embodiment of the present invention will be described below in detail with reference to the drawings with reference to FIGS.

(Embodiment 1) FIG. 1 is a plan view showing a configuration of a main part of a magnetic recording / reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is a plan view for explaining a start of a loading operation. . The same parts as those in the conventional example will be described with the same reference numerals.

First, the overall configuration will be described. FIG.
, The capstan motor 1 is a rotation drive source of the take-up reel base 3 and the supply-side reel base 4. Magnetic tape 5
Are wound on two reels provided on the tape cassette 2. And tape cassette 2 is VTR
The magnetic tape 5 is pulled out by a mechanism (not shown) and wound around the cylinder 6. The magnetic tape 5 is sandwiched between the capstan shaft 7 and the pinch roller 8 at the time of reproduction or reverse reproduction, and travels with the pinch roller 8 separated from the capstan shaft 7 at the time of rewinding or fast-forwarding.

The running of the magnetic tape 5 is performed by a capstan shaft 7 and a pinch roller 8 which are driven to rotate while holding the magnetic tape 5. In this case, the magnetic tape 5 is slackened or excessively moved. Appropriate back tension must be applied to avoid tension.

In order to apply such back tension to the magnetic tape 5, a tension arm 9 is provided.
A tension band 11 serving as a braking member is provided over a predetermined angle of the winding portion of the supply-side reel base 4, and both ends are attached to the tension arm 9 via first and second holding members 12 and 102.

The back tension of the magnetic tape 5 must be uniform and appropriate from the beginning to the end of the winding, but such adjustment can be made by adjusting the position of the tension arm 9 or adjusting the contact force of the tension band 11. I can do it.

Next, the structure of the actual back tension adjusting mechanism will be described with reference to FIG. The tension arm 9 is rotatably mounted around a first pin 15 press-fitted and fixed to the base 14 as a center of rotation. The tension post 10 is arranged near the tip of the turning radius of the tension arm 9 and is slidably fixed to the magnetic tape 5 running at the turning position. The tension arm 9 holds one end of a tension coil spring 16 as an urging member.

Therefore, in the tension arm 9, when there is a restoring force of the tension coil spring 16, a rotating couple is urged in the direction of arrow A. Tension band 11 which is a braking member of reel base 4
Is held by the tension arm 9 while being held by the first holding member 12, wound around the winding portion of the reel base 4, and the other end is held by the second holding member 13. It is locked to the tension arm 9 in this state.

The tension band 11 rotates in the direction A of the tension arm 9 until the slack of the band is eliminated, that is, until the loading of the magnetic tape 5 is completed. Since a given tension acts on the tension band 11, the reel base 4 is provided with a rotation braking action.

Further, a tension coil spring 1 as an urging member
The other end of 6 is engaged with an elastic force adjusting member 101, which is a control member rotatably disposed on the base 14, so that the restoring force of the tension coil spring 16 can be adjusted. The follower 18 is formed integrally with the elastic force adjusting member 101, and as shown in the figure, a guide portion 20 provided on a driving plate 19 which is a means for guiding the rotational position of the elastic force adjusting member 101 as a control member. The elastic force adjusting member 101 is rotated in the direction of arrow B or the direction of arrow C according to the amount of movement of the drive plate 19 by the engagement relationship between the elastic member and the follower 18.

An operation example of the magnetic recording / reproducing apparatus according to the present embodiment configured as described above will be described with reference to FIGS. 1, 2, 3 and 4.

After the tape cassette 2 is loaded, the magnetic tape 5
During the loading operation, the driving plate 19 is slid in the direction D by driving means (not shown), and the follower 18 is guided by the guide portion 20 of the driving plate 19, and the tension coil spring 1
Due to the restoring force of 6, the tension arm 9 is rotated in the direction of arrow A by a rotating couple, moves from the storage position in the tape cassette, and the tension post 10 comes into contact with the magnetic tape 5 on which the loading is completed.

Next, when the recording or reproduction mode is set, the driving plate 19 is further driven by driving means (not shown).
Until the restoring force of the tension coil spring 16 as the urging member reaches a predetermined rotation position.
The elastic force adjusting member 101 is turned in the direction, and a predetermined turning couple acts on the tension arm 9. Here, when the magnetic tape 5 runs, the contact force of the magnetic tape 5 on the tension post 10 changes according to the tension of the magnetic tape 5, and therefore, the tension arm 9 rotates according to the tension of the magnetic tape 5. As a result, the tightening state of the tension band 11 changes.

Now, when the tension of the magnetic tape 5 running in the recording or reproducing mode increases, the tension arm 9
Is rotated clockwise, so that the tension band 1
1 is loosened, the braking force of the reel base 4 is reduced, and the tension of the magnetic tape 5 is reduced. Contrary to this, when the tension of the magnetic tape 5 decreases, the contact force of the magnetic tape 5 against the tension post 10 decreases, and the restoring force of the tension coil spring 16 causes the tension arm 9 to rotate counterclockwise, and As the band 11 further tightens the reel base 4 and the tension of the magnetic tape 5 increases,
As in the prior art, a tension adjusting mechanism operates.

In this embodiment, as shown in FIG. 2, during the loading operation of the magnetic tape 5 from the time when the cassette is mounted and the time when the cassette is mounted, that is, the tension post 10 is pulled out from a position in the tape cassette by a drawing means (not shown). At the rotation position of the tension arm 9 until it is pulled out and comes into contact with the magnetic tape 5,
A driving plate 19 as a guiding means is driven in a direction E by a driving means (not shown).

The follower 18 provided integrally with the elastic force adjusting member 101 is separated by the shape of the guide portion of the driving plate 19, and the elastic force adjusting member 101 is
Is rotatable to a position regulated by the restoring force, and is urged to rotate in the direction of arrow F.

The pressing portion 104 provided integrally with the elastic force adjusting member 101 is regulated in a state where the pressing portion 104 is in contact with the cam surface 103 serving as a guide portion of the second holding member 102, that is, in the first position.

The tension arm 9 is rotated in the direction A by the restoring force of the tension coil spring 16, which is an elastic member, and continues to rotate to the loading completed state.

A pressing portion 104 provided integrally with the elastic force adjusting member 101 is used to guide a cam surface 103 which is a guide portion of a second holding member 102 for holding the tension band 11 wound around the reel base 4. Press the second holding member 102 until the tension band 11 is no longer slack.
Is rotated in the direction of arrow G and the rotation is restricted when the tension band 11 is no longer slack.

In the second holding member 102, the pressing force balanced with the rotational couple of the elastic force adjusting member 101 by the restoring force of the tension coil spring 16 is applied to the second holding member 10.
The second guide portion acts on the cam surface 103. Further, in the second holding member 102, the pressing portion 104 of the elastic force adjusting member 101 and the second holding member 1
02 and the cam surface 103, a rotational couple balanced by the restoring force of the tension coil spring 16 acts in the direction of arrow G around the rotation fulcrum of the second holding member 102, resulting in a tension band. 11 will be tensioned.

Therefore, tension is applied to the tension band while the tension post 10 is not in contact with the magnetic tape 5 during the loading operation from when the tape cassette is mounted and when the cassette is mounted to when the loading is completed. Naturally, a braking load is applied to the reel base 4.

In particular, since the tension arm 9 has one end locked, the locking portion of the tension coil spring 16 is also rotated during the loading operation, that is, during the rotation operation of the tension arm 9. Because
Since the operation length of the tension coil spring 16 changes according to the amount of rotation of the tension arm 9, the rotation couple of the elastic force adjusting member 101 also changes.

Therefore, a cam surface 103 serving as a guide portion is provided on the contact surface between the second holding member 102 and the elastic force adjusting member 101.
Is formed, and the pressing portion 104 of the elastic force adjusting member 101 and the second
By setting the engagement relationship between the holding member 102 and the cam surface 103 serving as the guide surface to an appropriate one, the optimum tension band 11 as necessary is required during the loading operation from when the cassette is mounted to when the loading is completed.
, And during the loading operation from when the cassette is mounted to when the loading is completed, the braking force can be applied to the reel base 4 while being changed to the optimum braking load.

(Embodiment 2) In Embodiment 2 of the present invention, as shown in FIG. 4, during the loading operation of the magnetic tape 5 from when the cassette is mounted, that is, until the tension post 10 comes into contact with the magnetic tape 5. At the rotation position of the tension arm 9 at, the drive plate 19 as the guide means is driven in the H direction by the drive means (not shown),
The follower 18 provided integrally with the guide portion 20 of the drive plate 19 and the elastic force adjusting member 101 as a control member is separated.

Therefore, the elastic force adjusting member 101 is at the first position where it can rotate freely, and is rotated and urged in the direction of arrow I by the restoring force of the tension coil spring 16 as the urging member. The pressing portion provided integrally with 101 is regulated in a state where it is in contact with tension band 11. Further, the tension arm 9 is rotated in the direction A by the restoring force of the tension coil spring 16, which is an urging member, and keeps shifting to a loading completed state.

In the elastic force adjusting member 101, since another end of the tension coil spring 16 which is an urging member is stretched, it is moved in the direction I by a rotational couple corresponding to the restoring force of the tension coil spring 16. Is rotated. A pressing portion 104 provided integrally with the elastic force adjusting member 101
Presses the tension band 11 wound on the reel base 4, and the second holding member 13 rotates in the direction of arrow J until the tension band 11 is no longer slack, and the elasticity due to the restoring force of the tension coil spring 16. The pressing force balanced with the rotational couple of the force adjusting member 101 is applied to the tension band 11.

Further, in the tension band 11, the tension band 11
Until the slack disappears, the second holding member 13 is turned around the turning fulcrum in the direction of the arrow J, and the tension band 1 is turned.
When the slack is eliminated, a tension corresponding to the rotational couple of the elastic force adjusting member 101 is directly applied to the tension band 11. Therefore, during the loading operation after the cassette is mounted, the tension post 1
Since a direct tension is applied to the tension band 10 while the zero is not in contact, a braking load is applied to the reel base 4.

According to the present embodiment configured as described above, a stable optimal braking load can be applied to the reel even during the loading operation from the cassette mounting to the completion of loading without adding a dedicated brake member. Since it can be attached to the table, tape slack when loading the cassette, dropping of the magnetic tape from the cylinder regulating lead surface during the loading operation, dropping from the height regulating member when the magnetic tape withdrawal speed changes during loading, etc. In the vicinity of the completion of the loading operation, it is possible to prevent the slack due to the magnetic tape being excessively caused due to the inertia of the rotation of the reel base, and during the loading operation, the tension of the magnetic tape is changed to the optimum tension of the tape as needed, and the tape is changed. Damage can be prevented.

Further, according to the present embodiment, a braking load can be applied to the reel base even during the loading operation from the cassette mounting to the completion of loading without adding a dedicated brake member. When the tape slacks during loading, the magnetic tape falls from the cylinder regulating lead surface during the loading operation, or when the magnetic tape pull-out speed changes during loading, the magnetic tape drops from the height regulating member and the reel base closes when the loading operation is completed. It is possible to prevent the magnetic tape from being slackened due to excessive rotation caused by the inertia of rotation.

Therefore, in this type of conventional apparatus, a dedicated brake component necessary for applying a braking force to the reel base during mounting of the cassette or during loading, that is, a brake arm, a pin at the center of rotation, Many members such as an elastic member spring for a predetermined braking force and a regulating means for regulating the brake arm can be eliminated,
The number of parts can be greatly reduced, and as a result of the reduction in the number of components, the number of assembling steps can be reduced, and the cost can be significantly reduced.

Further, as compared with the conventional dedicated brake member, a band brake which also functions as a tension band is used, and a braking load is applied by a pressure acting over the winding angle of the tension band. There is an advantage that a stable braking load with less variation can be expected as compared with a block-type brake that is partially pressed.

Also, as compared with the conventional dedicated brake member, the surface pressure of the contact portion on the reel base is relatively low due to the action over the winding angle, so that the reliability such as the service life of the conventional system is lower than that of the conventional system. There is an advantage that it is improved.

[0058]

As described above, according to the magnetic recording / reproducing apparatus of the present invention, a required braking load on the reel base can be obtained even when the cassette is mounted or during the loading operation until the loading is completed. Due to tape slack when loading the cassette or dropping of the magnetic tape from the cylinder regulating lead surface during the loading operation, dropping from the height regulating member at the time of change in the drawing speed of the magnetic tape during loading, and near the completion of the loading operation Thus, it is possible to prevent the magnetic tape from being excessively slackened due to the inertia of the rotation of the reel base, thereby preventing tape damage.

Therefore, in this type of conventional device,
Dedicated brake components necessary for applying a braking force to the reel base during the cassette mounting operation or during the loading operation of the magnetic tape, ie, a brake arm, a pin at the center of rotation, and elasticity for a predetermined braking force. Member spring,
Also, many members such as regulating means for regulating the operation of the brake arm can be eliminated, and the number of parts can be greatly reduced.As a result of the reduction in the number of components, the number of assembling steps is reduced, and the cost is significantly reduced. .

Further, as compared with the conventional dedicated brake member, a band brake which also serves as a tension arm is used, so that a conventional partial pressing is applied to apply a braking load with a pressure acting over the winding angle of the tension band. A stable braking force can be expected as compared with the block type brake, and during the loading operation, the tape is pulled out with a stable tape tension with little variation, so that tape damage due to excessive tension can be prevented.

Further, as compared with the conventional dedicated brake member, the surface pressure of the contact portion on the reel base is relatively low due to the action over the winding angle. There is an advantage that it is improved.

[Brief description of the drawings]

FIG. 1 is a plan view of a magnetic recording and reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a start of a loading operation in the embodiment.

FIG. 3 is a plan view of a magnetic recording and reproducing apparatus according to a second embodiment of the present invention.

FIG. 4 is a plan view showing a start of a loading operation according to a third embodiment of the present invention.

FIG. 5 is a plan view showing a schematic configuration of a conventional magnetic recording / reproducing apparatus.

FIG. 6 is a plan view showing the start of a loading operation of a conventional configuration.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Capstan motor 2 Tape cassette 3 Take-up reel stand 4 Supply-side reel stand 5 Magnetic tape 6 Cylinder 7 Capstan shaft 8 Pinch roller 9 Tension arm 10 Tension post 11 Tension band 12 First holding member 13 Second holding Member 14 Base 15 First pin 16 Tension coil spring 17 Elastic force adjusting member 18 Follower 19 Driving plate 20 Guide 21 Second pin 22 Brake member 23 Second biasing member 101 Elastic force adjusting member 102 Second holding member 103 Cam surface 104 Pressing part

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kazuki Tanabe 1006 Kazuma Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (4)

[Claims] 1. A reel base for supplying or winding a magnetic tape, a tension band wound around the reel base at a predetermined angle and capable of braking the reel base, and a first holding one end of the tension band. A second holding member that holds the other end of the tension band and has a guide portion; and the first and second holding members are rotatably locked.
A tension arm having a tension detection member with which the magnetic tape slides in contact with the traveling, and rotatably supported by a shaft; one end of which is locked to the tension arm, and a tape tension during recording or reproduction traveling of the magnetic tape is desired; A biasing member that can be adjusted to a value, and a contact portion that locks the other end of the biasing member and that can abut on a guide portion of the second holding member. A control member capable of contacting or separating from a guide portion of the member; a first position at which the contact portion of the control member can freely contact the guide portion of the second holding member; and a guide of the second holding member. A magnetic recording / reproducing apparatus, comprising: a guide means capable of guiding to a second position separated from the unit. And a guide unit for moving the control member to a first position where the control member can freely contact the guide portion of the second holding member during the loading operation of the tape cassette and during the loading operation from the mounting of the tape cassette to the completion of the loading. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein guidance is provided. 3. A reel base for supplying or winding a magnetic tape, a tension band wound around the reel base at a predetermined angle and capable of braking the reel base, and a first holding one end of the tension band. And a second holding member for holding the other end of the tension band, and the first and second holding members are rotatably locked,
A tension arm having a tension detecting member with which the magnetic tape slides and slides when the magnetic tape travels, and a pivot arm rotatably supported; one end of which is locked to the tension arm, and a tape tension during recording or reproduction traveling of the magnetic tape is desired; A biasing member that can be adjusted to a value, and a contact portion that locks the other end of the biasing member and that can freely contact the tension band, and is capable of contacting or separating from the tension band. A magnetic member comprising: a member; and a guide means capable of guiding a contact portion of the control member to a first position at which the contact portion can freely contact the tension band and a second position at which the contact portion is separated from the tension band. Recording and playback device. 4. A guide means for guiding a control member to a first position where the control member can abut on the tension band during mounting of the tape cassette and during a loading operation from mounting of the tape cassette to completion of loading. The magnetic recording / reproducing apparatus according to claim 3.