JP3428457B2 - Magnetic recording / reproducing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording and reproducing apparatus such as a video tape recorder, and more particularly to an improvement in a brake control mechanism on a take-up reel. 2. Description of the Related Art A magnetic tape pulled out of a tape cassette and loaded or unloaded into a cylinder travels on a predetermined traveling route according to a predetermined operation mode. [0003] That is, a first traveling route performed in a loading state, for example, a recording / reproducing mode, a fast forward reproducing /
In the rewind playback mode and the slow playback / reverse slow playback mode, the vehicle travels on a predetermined path while being pressed against the capstan by a pinch roller, and a second traveling path performed in an unloading state, that is, fast forward. /
In the rewind mode, the state of being pressed against the capstan by the pinch roller is released, and the vehicle travels on a predetermined path without being pressed. In such a running state, in order to make the tape run stably, among the operation modes taking the first running path, in the recording / reproduction mode, the fast-forward reproduction mode, and the slow reproduction mode, the supply reel table side is used. In the rewind playback mode and the reverse slow playback mode, a relatively weak braking force is applied to the take-up reel base to apply a constant tension to the tape. . To stop the tape running in the first running path, it is only necessary to stop the rotation of the capstan motor, and the supply reel table and the take-up reel table are stopped from rotating by the relatively weak braking force described above. . On the other hand, in the fast-forward / rewind mode in which the second traveling path is taken, both the supply reel table side and the take-up reel table side rotate freely, and when the tape traveling is stopped, This is performed by applying a relatively strong braking force to both the supply reel table side and the take-up reel table side. Accordingly, regarding the brake mechanism on the take-up reel table side, in the rewind reproduction mode and the reverse slow reproduction mode in which the tape takes the first traveling path, the tape is relatively weak even when the tape is traveling. The braking force is applied, and when stopping the tape running, it is only necessary to stop the rotation of the capstan motor. However, in the fast-forward / rewind mode taking the second running path, the tape is free during the running of the tape. When stopping the tape running, it is necessary to apply a relatively strong braking force to the take-up reel base, and two types of braking forces are required in accordance with the operation mode. For this reason, conventional means generally used include a main brake mechanism for applying a relatively strong braking force to stop the tape running from the fast forward / rewind mode, a rewind playback mode, and a reverse slow mode. In the regeneration mode, two types of brake mechanisms, that is, a sub-brake mechanism for applying a relatively weak braking force, are provided, and the braking mechanisms are selectively used according to the operation mode to obtain the required braking force for each. In addition, a single mechanism is used as the brake mechanism, and means for switching the braking force obtained by the single brake mechanism into two types, relatively strong braking force and relatively weak braking force, is provided according to the operation mode. A method of obtaining a braking force is also provided. However, when two types of brake mechanisms, a main brake mechanism and a sub-brake mechanism, are provided, the area occupied by the brake mechanisms becomes large, which is disadvantageous for downsizing the apparatus, and the number of parts is reduced. However, there is a problem that the cost is increased and the cause of failure is increased. Also, when a means for switching the braking force obtained by a single brake mechanism is provided, there is a problem that the structure is complicated and the causes of failures are increased. Therefore, in the present invention, when two kinds of braking forces are obtained on the take-up reel side, a desired control can be performed in accordance with the operation mode without adding any special means. It is an object of the present invention to provide a brake control mechanism capable of obtaining power. [0010] The tape running in the various running modes is desired to be always in a stable running state. In particular, in a slow playback / reverse slow playback mode in which the tape is run with a weak braking force applied to the capstan. As means for stabilizing the running state of the tape, a tape guide pin is provided between the capstan and the take-up reel to regulate the vertical movement of the running tape. That is, a tape guide pin having a step for regulating the vertical movement of the tape is provided between the capstan and the take-up reel, and the tape is moved along the tape guide pin to move the tape vertically. It prevents the dance in the direction. In the present invention, two kinds of desired braking forces are applied to the take-up reel table by utilizing the existing tape guide pins without providing a special brake mechanism. . That is, according to the present invention, there are two traveling paths, a first traveling path in which the magnetic tape travels while being pressed against the capstan by the pinch roller, and a second traveling path in which the magnetic tape travels in the non-pressed state. A magnetic recording / reproducing apparatus having a magnetic recording / reproducing apparatus, wherein one end portion is rotatably provided on a substrate and located between a capstan and a take-up reel; And a pivoting lever that pivots to the intermediate position about the support shaft via the interlocking member in the second traveling path, and an end of the pivoting lever on the capstan side. A tape guide pin having a step to regulate the vertical movement of the tape is erected, and both ends of a brake band wound around a take-up reel stand are fixed, and the support shaft is centered through the interlocking member. Rotate and brake And a tension coil spring that applies a braking force at the operation position of the brake band, between the end portions approaching each other when the swing lever rotates. pass over the rocking lever, is a braking force corresponding to the spring force of the tension coil spring that expands and contracts depending on the rotational position of the swing lever so as to impart to the take-up reel table
And in the operation mode taking the first traveling route
The brake lever as the final position
By giving the lever a relatively weak spring force,
The brake band in the operation position is located on the take-up reel base.
To provide a relatively weak braking force to the second travel path.
In the operation mode in which the swing lever is in the intermediate position,
The first travel path to the brake lever
By giving a stronger spring force than the
The brake band, which has been set to the operation position, is
It is characterized by giving a strong braking force to the base
I have . According to the present invention having such features,
When taking the first traveling path in which the magnetic tape travels in a state of being pressed against the capstan by the pinch roller, the magnetic tape is guided by the tape guide pin of the swing lever that has been rotated to the final position around the support shaft. When the vehicle runs, but the operation mode is set to the rewind playback mode or the reverse slow playback mode that requires that a weak braking force be applied to the take-up reel base, the brake lever is operated via the interlocking member. The braking force applied by bringing the brake band wound on the take-up reel base to the operating position by rotating about the support shaft is in a state in which both ends are approached and contracted by the rotation of the swing lever. , A relatively weak braking force is applied in accordance with the spring force of the tension coil spring. On the other hand, when the magnetic tape takes a second traveling path in which the magnetic tape is released from the state of being pressed against the capstan by the pinch roller, that is, in the fast-forward / rewind mode, the support shaft is moved via the interlocking member. The pivoting lever that pivots to the center has pivoted to an intermediate position, and both ends of the tension coil spring are in a state where they are slightly separated from the approaching state when the tape takes the first traveling path. Therefore, when the operation of stopping the running of the tape is performed, when the brake lever rotates around the support shaft via the interlocking member to bring the brake band wound on the take-up reel base to the operation position,
A braking force stronger than the braking force obtained when the first traveling route is taken is applied to the take-up reel base, and the rotation of the reel base is stopped. Accordingly, the weak reeling force required in the rewind playback mode or the reverse slow playback mode and the forced power required when the stop operation is performed from the fast forward / rewind mode are set in accordance with the operation mode. It is not necessary to provide two types of brake mechanisms, a main brake mechanism and a sub-brake mechanism, or to provide special braking force switching means as in the related art. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A magnetic recording / reproducing apparatus to which the present invention is applied travels while a magnetic tape pulled out from a tape cassette is loaded on a cylinder and pressed against a capstan by a pinch roller. In a first traveling path, for example, a recording / reproducing mode, a fast-forward reproducing / rewinding reproducing mode, a slow reproducing / reverse slow reproducing mode, and a state where the pinch roller is pressed against the capstan in an unloaded state, It has a second traveling path traveling in a crimped state, that is, a fast-forward / rewind mode,
In the operation mode taking the first traveling path, a constant tension is applied to the tape by applying a relatively weak braking force to the supply reel table side or the take-up reel table side. It suffices to stop the rotation of the capstan motor.On the other hand, in the operation mode taking the second traveling path, both the supply reel table side and the take-up reel table side rotate freely without applying a braking force. When the tape running is stopped, the operation mode and various operations are performed by applying a relatively strong braking force to both the supply reel table and the take-up reel table. Under the control of the In the present invention,
Such a magnetic recording / reproducing apparatus is intended for a brake control mechanism on the take-up reel base side in particular, and a weak braking force required in an operation mode taking a first traveling path and an operation taking a second traveling path. In this mode, the forcible power required to stop the tape running in the mode is obtained by utilizing the members already used in the running path. Hereinafter, this point will be described with reference to the drawings. I do. FIG. 1 shows a standby state in which a braking force is applied to the take-up reel base 1 in the loading state and the unloading state, and the pinch roller 2 is separated from the capstan 3. Both ends of the brake band 4 wound around the take-up reel base 1 are fixed to a brake lever 5, and in the state shown in the figure, the brake lever 5 that rotates about a support shaft 5a via an interlocking member is braked. The position of the brake band that puts the band 4 in tension is taken,
The braking force is applied to the take-up reel base 1 by the spring force of the extension coil spring 6. Reference numeral 7 is provided as a means for stabilizing the tape running state in the slow reproduction / reverse slow reproduction mode in which the tape is run with a weak braking force applied to the capstan 3 by a brake mechanism (not shown). The tape guide pins have stepped portions 7a and 7b for regulating the vertical movement of the tape, and the tape is prevented from jumping in the vertical direction by running the tape along the tape guide pins 7. Reference numeral 8 denotes a rocking lever which is located between the capstan 3 and the take-up reel base 1 and has one end pivotally supported on a substrate and is rotatable clockwise around a support shaft 8a via an interlocking member. The tape guide pin 7 is connected to the swing lever 7
Is set up at the end of the capstan side. The illustrated state shows a state in which the standby position is maintained by the return spring 9. When the swing lever 8 rotates clockwise, the tension coil springs 6 move toward the ends 5b,
The brake lever 5 and the swing lever 8 are stretched between 8b. Accordingly, when the swing lever 8 is in the standby position and the brake lever 5 is in the state shown by the dashed line in FIG. As the swing lever 8 rotates clockwise about the support shaft 8a via the interlocking member, the amount of contraction increases. FIG. 2 shows a first traveling path in which the magnetic tape travels while being pressed against the capstan 3 by the pinch roller 2 in the loading state, for example, a recording / reproduction mode, a fast forward reproduction / rewind reproduction mode, a slow reproduction / reproduction mode. This figure shows the positions of the swing lever 8 and the brake lever 5 when the reverse slow playback mode is set. The brake lever 5 is a brake band that rotates about a support shaft 5a via an interlocking member. The brake lever 4 is in a tensioned state, and the swinging lever 8 is pivoted to the final position clockwise around the support shaft via the interlocking member. In this positional relationship, the end 5b of the brake lever 5 and the end 8b of the swing lever 8 are close to each other, and the extension coil spring 6 is in the most contracted state. FIG. 3 shows a second traveling path performed in the unloading state, that is, a state of the fast-forward / rewind mode, in which the magnetic tape is released from the pinch roller 2 by pressing the capstan 3 against the capstan 3. The vehicle travels on a predetermined route in a non-pressed state. In this case, the brake lever 5
Takes a non-operating position of the brake band which is rotated clockwise about the support shaft 5a through the interlocking member to relax the brake band 4, and the swing lever 8 is interposed through the interlocking member. It has rotated clockwise about the support shaft to an intermediate position. In this positional relationship, the end 5 of the brake lever 5
b and the end 8b of the swing lever 8 are in a state where they are slightly apart from the approach state in the operation mode taking the first traveling path, and the tension coil spring 6 is in a state where it is slightly contracted. Next, the braking force applied to the take-up reel base will be described. In the rewind reproduction mode or the reverse mode in which a weak braking force needs to be applied to the take-up reel base in the first traveling path. In the slow play mode, the brake lever 5 is rotated counterclockwise about the support shaft 5a via the interlocking member to take the action position of the brake band that puts the brake band 4 in a tensioned state. A braking force is applied to the take-up reel base 1 by the spring force of the spring 6, but since the swinging lever 8 has been rotated clockwise around the support shaft through the interlocking member to the final position in the clockwise direction, this position is set. In the relationship, the end 5b of the brake lever 5 and the end 8b of the swing lever 8 come close to
Is in the most contracted state, and a relatively gentle braking force is applied to the take-up reel base 1. On the other hand, in the fast-forward / rewind mode that takes the second running path, during tape running, the brake lever 5 rotates clockwise about the support shaft 5a via the interlocking member to move the brake band 4 around. The relaxed brake band is in the non-operating position, and the reel base is rotating without applying the braking force. When the traveling stop operation is performed in this traveling state, the brake lever 5 is moved to the support shaft 5a via the interlocking member.
Is turned counterclockwise around the center position to take the action position of the brake band that makes the brake band 4 in a tensioned state, and a braking force is applied to the take-up reel base 1 by the spring force of the tension coil spring 6. However, since the swing lever 8 has been rotated to the clockwise intermediate position about the support shaft via the interlocking member, the end 5b of the brake lever 5 and the end 8b of the swing lever 8 are The tension coil spring 6 is slightly apart from the approaching state in one traveling path, and is in a slightly contracted state, and a stronger braking force is applied to the take-up reel base 1 than in the case where the first traveling path is reversed. Then, the rotation of the reel base and the running of the tape are stopped. Therefore, when the braking force is applied to the take-up reel base, it is possible to apply the braking force corresponding to each of the case of taking the first traveling route and the case of taking the second traveling route. Moreover, there is no need to use two types of brake mechanisms or special means for switching the braking force, and the existing tape guide pins used for obtaining a stable tape running state in the tape running system are used. Is achieved by doing so. As described above, in the magnetic recording / reproducing apparatus according to the present invention, when obtaining two kinds of braking forces on the take-up reel side, without adding any special means,
As means for stabilizing the tape running state in the slow playback / reverse slow playback mode, a tape guide pin provided between the capstan and the take-up reel and provided to regulate the vertical movement of the running tape is used. The desired braking force is obtained by adjusting the spring force of the tension coil spring that applies the braking force at the position where the brake band acts, according to the operating position of the rocking lever with the tape guide pin set up. It is not necessary to provide two types of brake mechanisms or special braking force switching means.
Therefore, it is advantageous in reducing the size of the apparatus, has the advantages of reducing the number of parts and cost, does not require a complicated structure, and has fewer causes of failure.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing an embodiment of a take-up reel base side brake mechanism employed in a magnetic recording / reproducing apparatus according to the present invention;
The relation of each part in a standby state is shown. FIG. 2 is a plan view showing the relationship between the components of the brake mechanism when the magnetic tape takes a first traveling path. FIG. 3 is a plan view showing the relationship between the components of the brake mechanism when the magnetic tape takes a second traveling path. FIG. 4 is an exploded perspective view of the brake mechanism. [Description of Signs] 1 ... Take-up reel base 2 ... Pinch roller 3 ... Capstan 4 ... Brake band 5 ... Brake lever 6 ... Tension coil spring 7 ... Tape guide pins 7a and 7b ... Stepped portion 8 ... Swing lever

Continued on the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G11B 15/22 G11B 15/18 G11B 15/60 G11B 15/29

Claims (1)

(57) [Claims 1] There are two routes: a first traveling route that runs when the magnetic tape is pressed against the capstan by the pinch roller, and a second traveling route that runs while the magnetic tape is not pressed. A magnetic recording / reproducing apparatus having a traveling path of a path, wherein the intermediary member is provided between the capstan and the take-up reel, and is rotatably provided with one end pivotally supported on the substrate; And a swing lever that rotates to a final position around the support shaft through the interlocking member through the interlocking member in the second travel path. A tape guide pin having a step for regulating the vertical movement of the tape is provided upright at the end on the capstan side, and both ends of the brake band wound around the take-up reel stand are fixed, and the interlocking member Rotate around the support shaft and break A brake lever is provided for taking the working position and the non-working position of the band, and a tension coil spring for applying a braking force at the working position of the brake band is provided between the end portions approaching each other when the swing lever rotates. The first travel path , which is applied to the take-up reel base by bridging the swing lever and applying a braking force according to the spring force of a tension coil spring that expands and contracts according to the rotation position of the swing lever. In the operation mode taking
Set the swing lever to the final position on the brake lever
By applying a relatively weak spring force,
The brake band was relatively
In the operation mode of applying a weak braking force to the second travel path,
Set the swing lever to the intermediate position and
Spring stronger than the operation mode taking the first travel path
By applying a force, the brake is brought into the working position.
So that the band gives a strong braking force to the take-up reel base
The magnetic recording / reproducing apparatus configured as described above .