JPH087400A - Magnetic recording/reproducing apparatus - Google Patents

Abstract

PURPOSE:To keep the tension of a tape in a running route constant at the time of a recording/reproducing mode and, further, reduce the number of components by a method wherein a tension band is utilized as a supply side main brake. CONSTITUTION:When a spring-loaded arm 24 is at a first position, the actuating force of a tension spring 23 is applied to a tension arm 21 and the tension of a tape 2 which is applied to a tension post 19 is balanced with the tension of a tension band 20. A take-up side tension control mechanism is operated by an operating member so as to make a tension band 26 touch a take-up reel base 14. A pinch roller 10 is pressed against a capstan 9 with a required pressing force. If a capstan motor 8 required revolution in this state, the tape 2 is made to run while its tension is kept constant by a pay-off side tension control mechanism and the recording/reproducing can be carried out.

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 such as a video tape recorder and a digital audio tape recorder.

[0002]

2. Description of the Related Art In recent years, in a magnetic recording / reproducing apparatus having a rotary head typified by a VTR or the like, so-called full-loading, in which high-speed fast-forward / rewind operation is performed with a tape wound around a rotary cylinder, is emphasized with operability being important. It is becoming mainstream.

The structure and operation of a conventional full loading model will be described with reference to FIGS. 14 to 16.

The tape 101 of the cassette 100 is pulled out to the vicinity of the cylinder 103, and the tape is driven at a predetermined speed by a capstan 104 and a pinch roller 105 to perform recording / reproduction or the like.

The tension post S106 is the tape 101.
The tension is detected by contacting with. One end of the tension band 107 has a tension arm S108.
And is configured to apply a load to the supply reel base 109. The tension spring S110 is connected to the tension arm S108. Tension spring S110
The other end of the tension spring S110 is connected to the spring arm 111.
The urging force applied to the tension arm S108 is changed.

Next, referring to FIG. 16, the tension band 1
07 calculates the braking load applied to the supply reel base 109. If the tape 101 has no tension or is very small, the braking load is calculated as follows.

[0007]

[Equation 1]

[0008]

[Equation 2]

[0009]

(Equation 3)

[0010] Regardless of the values of μ and θ,
Since eμθ ≧ 1, from the equation (3), Φ _S1 / Φ _S2 ≦ 1, that is, Φ _S1 ≦ Φ _S2 .

The tension post T112 is the tape 101.
The tension is detected by contacting with. The brake portion 113 is provided on the tension arm T114, and is configured to apply a load to the take-up reel stand 115. The tension spring T116 is the tension arm T1.
It is connected to 14. On the other hand, supply side main brake 1
Reference numeral 17 is a configuration that can abut the supply reel base 109,
The brake torque is large when the supply reel base 109 rotates in the feeding direction, and the brake torque is small when the supply reel base 109 rotates in the winding direction.

The take-up side main brake 118 is constructed so that it can be brought into contact with the take-up reel stand 115, and when the take-up reel stand 115 rotates in the feeding direction, the brake torque is large and the take-up reel stand 115 takes up the take-up reel stand 115. The brake torque is reduced when rotating in the direction.

Further, the light emitting element 119 and the light receiving element S12
0, the light receiving element T121 is provided at the same height as the tape 101, and the light of the light emitting element 119 is blocked by the tape 101 at the position where the tape 101 can perform normal recording / reproducing, and the light receiving element S120 and the light receiving element T121 receive the light. Is not detected.

Next, the operation will be described. First, in the recording / reproducing mode, the supply side main brake 117, the winding side main brake 118, and the tension arm T.
The brake portion 113 provided on 114 does not come into contact with the supply reel base 109 and the take-up reel base 115. The tension arm S108 detects the tension in the traveling route and applies a load corresponding to the detected tension to the supply reel base 109 via the tension band 107. Therefore, the tension of the tape 101 in the traveling path is controlled to have a predetermined value that balances with the urging force of the tension spring 110. In this state, the tape 101 is driven by the capstan 104 and the pinch roller 105 at a predetermined speed.

Next, operations in the high speed fast forward rewind mode and the stop mode will be described. In the high-speed fast-forward rewind mode, the spring arm 111 rotates and the tension spring S11
The biasing force applied to the zero tension arm S108 is weakened, and the tension in the travel route is reduced. The tension arm T114 is in an operable state,
A load corresponding to the tension of the abutting tape 101 is applied to the take-up reel stand 115. Also, the pinch roller 105
Moves away from capstan 104 and capstan motor 1
The output of 22 is directly transmitted to the supply reel base 109 or the take-up reel base 115. In this way, the tape 101 is driven while the tension post S106 and the tension post T112 are controlled so that the tape tension in the traveling path becomes a predetermined value.

When a stop command is issued during the high-speed fast-forward rewinding operation, an operating member (not shown) moves, and the supply side main brake 117 and the take-up side main brake 118 are respectively supplied to the supply reel base 109 and the take-up reel. It operates on the table 115 and the tape 101 stops running. At this time, both main brakes 117 and 118 have a large brake torque in the feeding direction and a small brake torque in the winding direction, so that the tape 101 can be stopped without sagging and without applying abnormal tension. You can

Next, the operation when the power supply is stopped due to some abnormality (power failure, etc.) during the high speed fast forward rewind operation will be described. At this time, the power supply is dropped,
The operating member (not shown) cannot move. Since the power of the capstan motor 122 also leans, the tape 101 continues to run only by inertia, but the tension band 107 causes the tension band 107 to move because the tension is small.
9, the brake portion 113 of the tension arm T114 applies a load to the take-up reel stand 115, and the tape 10
The run of 1 will stop soon.

Next, the operation when the beginning and end of the tape 101 arrives will be described. When a transparent tape (not shown) provided at the beginning and end of the tape 101 comes, the light emitting element 119
Light passes through the transparent tape and is detected by the light receiving element S120 or the light receiving element T121, so a stop command is issued to the device and the above-described stop operation is performed.

[0019]

However, with the configuration of the conventional example, the supply side tension control mechanism including the tension post S106, the tension arm S108, the tension spring S110, the tension band 108, and the spring arm 111, and the tension post T108. , A tension arm T114, a brake portion 113, and a tension spring T116, a winding-side tension control mechanism, a supply-side main brake 117, and a winding-side main brake 118 are required, respectively, and the configuration is complicated and the number of parts is large. It is very disadvantageous in terms of cost. Further, the supply side main brake 117 and the winding side main brake 118
The brake torque is large due to the variation in the position and the variation in the friction coefficient between the brake unit and each reel stand. Depending on the type of tape and the amount of tape wound on each reel stand, tape sag and It also has the drawback that abnormal tension is applied and tape damage occurs.

Further, at the time of an abnormal stop such as a power failure, the brake torque in the feeding direction is smaller than the brake torque in the winding direction (Φ _S1 ≤ Φ _S2 ), so some braking force works, but the tape sags, It also has the drawback of leading to tape damage. Further, since expensive electric parts such as a light emitting element and a light receiving element are used, there are many drawbacks such that the cost is further increased.

[0021]

In order to solve the above-mentioned problems, the first structure of the magnetic recording / reproducing apparatus of the present invention is such that a tension post that comes into contact with a tape in a tape traveling path and a supply reel rotate together. And a first end portion in which the tension generated by the braking load is smaller than the tension generated at the other end when the supply reel base is subjected to a predetermined angle winding braking load and the supply reel base rotates in the delivery direction (clockwise direction). , A tension band having a second end portion in which the tension generated by the braking load is larger than the tension generated in the other end, and a tension post is mounted,
The tension post is rotatable according to the tension of the tape with which it abuts, and the first end of the tension band and the second
At least one end of the end portion is engaged, and the rotation torque generated by the first end portion is larger than the rotation torque generated by the second end portion. At the time, the first position that works so that the tension of the tape in the tape traveling path becomes a predetermined value, and at the time of the stop mode, the second position that works so that a predetermined braking force is applied to the supply reel base are selectively selected. And a movable biasing means.

In order to solve the above-mentioned problems, the second structure of the magnetic recording / reproducing apparatus of the present invention comprises a first tension post which comes into contact with a tape in a tape traveling path, and a supply reel stand which rotates integrally with a supply reel. When the supply load is applied with a predetermined angle winding braking load and the supply reel base rotates in the sending direction (clockwise direction), the tension generated by the braking load becomes smaller than the tension generated at the other end, and by the braking load. A first tension band having a second end portion in which a tension generated is larger than a tension generated in the other end, and a first tension post is mounted.
The tension post is rotatable according to the tension of the tape with which it abuts, and the first end of the first tension band,
At least one end of the second end is engaged, and the turning torque generated by the first end is larger than the turning torque generated by the second end. The first tension arm and the one end are engaged with the first tension arm. In the recording / playback mode,
It is possible to selectively move a first position, which works so that the tension of the tape in the tape traveling path becomes a predetermined value, and a second position, which works so as to apply a predetermined braking force to the supply reel base in the stop mode. The first biasing means, the second tension post that comes into contact with the tape in the tape running path, and the take-up reel stand that rotates integrally with the take-up reel apply a predetermined angular winding braking load to the take-up reel stand. A first end having a tension generated by a braking load that is smaller than the tension generated at the other end when rotating in the delivery direction, and a second end having a tension generated by the braking load greater than the tension generated at the other end A second tension band and a second tension post are mounted, and the second tension post is rotatable according to the tension of the tape with which the second tension post contacts. At least one end of the second end of the second tension band is engaged, and the rotation torque generated by the first end of the second tension band is the rotation torque generated by the second end of the second tension band. And a second urging means that engages with the second tension arm at one end and that applies a predetermined braking force to the take-up reel base in the stop mode. There is.

In order to solve the above-mentioned problems, the third structure of the magnetic recording / reproducing apparatus of the present invention is such that a motor for driving a tape, a tension post for contacting the tape in the tape traveling path, and a supply reel are integrated. A first end portion in which a rotating load reel base is subjected to a predetermined angular winding braking load, and when the supply reel base rotates in the delivery direction (clockwise direction), the tension generated by the braking load is smaller than the tension generated at the other end. And the tension generated by the braking load is larger than the tension generated at the other end.
A tension band having an end portion and a tension post are mounted, and can be rotated according to the tension of the tape with which the tension post abuts.
At least one end of the end portion and the second end is engaged, and a tension arm in which the rotation torque generated by the first end is larger than the rotation torque generated by the second end, and one end is engaged with the tension arm. In the recording / playback mode,
It is possible to selectively move a first position, which works so that the tension of the tape in the tape traveling path becomes a predetermined value, and a second position, which works so as to apply a predetermined braking force to the supply reel base in the stop mode. The urging means, the detection means for detecting an abnormal position in which the tension arm rotates by a tension of a predetermined value or more while the motor is driving the tape, and the motor drive is stopped by the output detecting the abnormal position of the detection means. And a control means for performing the operation.

In order to solve the above-mentioned problems, the fourth structure of the magnetic recording / reproducing apparatus of the present invention contacts the motor in the tape running path and the motor for driving the tape to generate a rotation synchronizing signal according to the rotation of the tape. The tension post and the supply reel base that rotates integrally with the supply reel apply a braking load with a predetermined angle winding, and when the supply reel base rotates in the delivery direction (clockwise direction), the tension generated by the braking load is the other end. First less than tension
A tension band having an end portion and a second end portion where the tension generated by the braking load is larger than the tension generated at the other end, and a tension post are mounted, and the tension band is rotatable according to the tension of the tape with which the tension post abuts. A tension arm in which at least one end of the first end of the tension band and at least one end of the second end of the tension band are engaged, and the turning torque generated by the first end is larger than the turning torque generated by the second end; One end is engaged with the tension arm, and in the recording / reproducing mode, the first position works so that the tension of the tape in the tape traveling path reaches a predetermined value, and in the stop mode, the supply reel base is controlled to a predetermined position. When the motor is driving the tape, the tension arm has a tension of a predetermined value or more when the motor drives the tape. Detection means for detecting an abnormal position that rotates due to the rotation of the supply reel base, and a detection signal for detecting a periodic rotation signal synchronized with the rotation of the supply reel base, and the detection means detects the abnormal position of the tension arm to drive the motor. When the first control unit that stops and the detection unit perform the high-speed fast-forward rewind operation, the position of the tape is calculated from the rotation synchronization signal of the motor and the rotation signal of the supply reel base, and the rotation speed of the motor is determined according to the position. And a second control means for controlling.

[0025]

In the magnetic recording / reproducing apparatus of the present invention having the above-mentioned first structure, in the recording / reproducing mode, the tension of the tape in the traveling path is kept constant by the tension post, the tension arm, the tension band and the biasing means. Work to keep on. Also, in the stop mode, the urging force applied to the tension arm of the urging means changes, and the braking load when the supply reel base rotates in the feeding direction becomes larger than the braking load when it rotates in the winding direction. Can act as a supply side main brake.

The magnetic recording / reproducing apparatus of the present invention has the above-mentioned second structure, so that when in the recording / reproducing mode, it travels by the first tension post, the first tension arm, the first tension band, and the first urging means. It works to keep the tension of the tape in the path constant. Further, in the stop mode, the urging force applied to the first tension arm of the first urging means changes, and the braking load when the supply reel base rotates in the feeding direction changes when the supply reel base rotates in the winding direction. It can be used as a supply side main brake because it is larger than the above. Further, the second urging means applies a braking load to the take-up reel stand via the second tension arm and the second tension band, and the braking load when the take-up reel stand rotates in the feeding direction rotates in the take-up direction. Since it is larger than the braking load at the time of performing, it can act as the winding side supply side main brake.

In the magnetic recording / reproducing apparatus of the present invention having the above-mentioned third structure, in the recording / reproducing mode, the tension of the tape in the traveling path is kept constant by the tension post, the tension arm, the tension band and the biasing means. Work to keep on. Further, in the stop mode, the urging force applied to the tension arm of the urging means changes, and the braking load when the supply reel base rotates in the feed-out direction becomes larger than the braking load when it rotates in the winding direction. It can act as a main brake on the supply side. Further, since the detection means for detecting an abnormal position where the tension arm rotates by a predetermined tension or more and the control means for stopping the drive of the motor for driving the tape by the output detecting the abnormal position of the detection means are provided, When the tape reaches the end and tension increases, it can be stopped.

In the magnetic recording / reproducing apparatus of the present invention having the above-mentioned fourth structure, in the recording / reproducing mode, the tension of the tape in the traveling path is kept constant by the tension post, the tension arm, the tension band and the biasing means. Work to keep on. Further, in the stop mode, the urging force applied to the tension arm of the urging means changes, and the braking load when the supply reel base rotates in the feed-out direction becomes larger than the braking load when it rotates in the winding direction. It can act as a main brake on the supply side. Further, the tape is detected by detecting means for detecting an abnormal position in which the tension arm rotates by a predetermined tension or more and a periodic rotation signal synchronized with the rotation of the supply reel base, and an output detecting the abnormal position of the detecting means. Since the control means for stopping the drive of the driving motor is provided, it is possible not only to stop when the tape comes to the beginning and end and the tension rises, but also it is possible to judge the winding diameter of the tape with one detection means. .

[0029]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of an essential part of a second configuration of the present invention.

The tape 2 of the cassette 1 is pulled out to the vicinity of the cylinder 3 to form a traveling path as shown in FIG. FE head 4, AC head 5, AE in the travel route
Heads such as the head 6 and guide posts 7 for stably running the tape 2 are provided. The tape 1 is driven at a predetermined speed by a capstan 9 and a pinch roller 10 which are directly connected to the capstan motor 8, and recording and reproduction are performed. A supply reel stand 12 that rotates integrally with the supply reel 11 of the cassette 1 and a take-up reel stand 14 that rotates integrally with the take-up reel 13 of the cassette 1 are rotatably provided. The recess 15 provided in the center of the cassette 1 has a light emitting element 16 for detecting the start and end edges, and a light receiving element S17 for detecting the start and end edges and a light emitting element for detecting the start and end edges, respectively, at positions where the light of the light emitting element 16 for the start and end detection can be received. A light receiving element T18 is provided.

Next, the supply side tension control mechanism will be described. The first tension post 19 contacts the tape 2 in the traveling path, and the tension of the tape 2 causes the first tension arm 21 to rotate. First tension band 2
0 has a structure in which the first end 20a is connected to the first tension arm 21 and the second end 20b is fixed to the chassis 22 to apply a load to the supply reel base 12. When the supply reel base 12 rotates in the delivery direction (clockwise), the tension T1 generated at the first end portion 20a of the first tension band 20 and the tension T2 generated at the second end portion 20b have a relationship of T1 <T2. (Fig. 3).
One end 23 a of the first tension spring 23, which is the first biasing means, is connected to the first tension arm 21.
The other end 23b of the first tension spring 23 is connected to the spring hook arm 24, and the turning force of the spring hook arm 24 changes the biasing force applied to the first tension arm 21 of the first tension spring 23. ing. First
The tension post 19, the first tension arm 21, the first tension band 20, the first tension spring 23, and the spring hook arm 24 constitute a supply side tension control mechanism.

Next, the braking load applied to the supply reel base 12 by the supply side tension control mechanism will be calculated with reference to FIG.
Generally, the tension control mechanism operates so that the tension becomes a predetermined value when the tape 2 is running with a constant driving force, but when the tape running driving force is lost, The mechanism that controls the tension does not work, but acts as a braking load that stops the tape running.
If the tape 2 has no tension or is very small, the braking load is calculated as follows:

[0033]

[Equation 4]

[0034]

(Equation 5)

[0035]

(Equation 6)

It becomes Regardless of the values of μ and θ,
Since eμθ ≧ 1, from equation (6), Φ _S1 ≧ Φ _S2 . That is, the braking load in the feeding direction is larger than the braking load in the winding direction (counterclockwise direction).

Next, the winding side tension control mechanism will be described. The second tension post 25 contacts the tape 2 in the traveling path, and the tension of the tape 2 causes the second tension arm to rotate. Second tension band 26
The first end portion 26a is connected to the second tension arm 27, the second end portion 26b is fixed to the chassis 22, and the take-up reel stand 14 is loaded. When the take-up reel base 14 rotates in the delivery direction, the tension T1 generated at the first end 26a of the second tension band 26 and the tension T2 generated at the second end 26b have a relationship of T1 <T2. There is. One end 28 a of the second tension spring 28, which is the second biasing means, is connected to the second tension arm 27. The second tension post 25, the second tension arm 27, the second tension band 26, and the second tension spring 28 constitute a winding-side tension control mechanism.

The braking load for stopping the tape running due to the lack of the driving force of the tape running can be calculated in exactly the same manner as in the case of the tension control mechanism on the supply side. Φ _T1 : Braking load (gf) in the feeding direction (counterclockwise direction)
・ Cm) Φ _T2 : Braking load in the winding direction (clockwise) (gf ・ c
m) then Φ _T1 > Φ _T2 . That is, the braking load in the feeding direction (counterclockwise) is larger than the braking load in the winding direction (clockwise). Ф _S1 , Ф _S2 ,
Quantitative values of Φ _T1 and Φ _T2 can be appropriately determined according to the respective dimensional specifications.
_S1 > Φ _T2 , Φ _T1 > Φ _S2 .

Next, the operation will be described. First, the operation in the recording / reproducing mode will be described (FIG. 1). The spring hook arm 24 is in the first position, and the biasing force of the first tension spring 23 acts on the first tension arm 21 to apply the tension of the tape 2 to the first tension post 19 and the first tension band 20. Tension (T1)
It is balanced with. The winding side tension control mechanism is operated by an operating member (not shown) so that the second tension band 26 does not hit the winding reel base 14. The pinch roller 10 is pressed against the capstan 9 with a predetermined pressing force. When the capstan motor 8 rotates at a predetermined speed in such a state, the tape 2 runs while maintaining a constant tension by the supply side tension control mechanism, and recording / reproducing becomes possible.

Next, the operation in the high speed fast forward rewind mode will be described (FIG. 2). Since the high-speed fast-forward operation and the high-speed rewinding operation are basically the same except that the tape 2 travels in the opposite directions, the high-speed fast-forward rewinding operation will be described below as a high-speed fast-forward operation unless otherwise noted. The spring hook arm 24 is in the second position, and the biasing force of the first tension spring 23 is smaller than the biasing force in the recording / reproducing mode. That is, the tension of the tape 2 in the traveling path is smaller than that in the recording / reproducing mode. The tension control mechanism on the take-up side is operated by an operation member (not shown), the second tension post 25 contacts the tape, the tension can be detected, and the second tension band 26 can also be braked on the take-up reel stand 14. It is in a state. The pinch roller 10 is separated from the capstan 9, and the driving force of the capstan motor 8 is directly transmitted to the supply reel base 12 or the take-up reel base 14. When the capstan motor 8 rotates at a predetermined speed in such a state, the tape 2 runs while maintaining a constant tension by the supply side tension control mechanism. This time,
The braking load applied to the supply reel base 12 by the first tension band 20 is the load (Φ) in the feeding direction (clockwise direction) as described above because the tape 2 having a predetermined tension is wound around the first tension post 19. _It is much smaller than _S1 ). On the other hand, the second tension band 2
The braking load 6 applies to the take-up reel base 14 is almost zero because the tension of the tape 2 that is in contact with the second tension post 25 is large.

Next, the operation when a stop command is issued during such a high-speed fast-forward rewinding operation will be described. When the stop command is issued, the signal driving the capstan motor 8 is cut off. Then, the tension of the tape 2 in the running path becomes smaller than that during running. When the tension of the tape 2 wound around the first tension post 19 becomes small, the original control operation causes the braking load applied to the supply reel base 12 by the first tension band 20 to become large, and finally, as described above. The load Ф _S1 in the feed direction (clockwise direction) is added. Similarly, since the tension of the tape 2 wound around the second tension post 25 also decreases, the braking load load applied to the take-up reel stand 14 by the second tension band 26 also increases, and finally the take-up direction (counterclockwise direction). ) Load Φ _T2 is added. As mentioned above, since Φ _S1 > Φ _T2 , it has exactly the same function as the main brake of the conventional example, and the running tape 2 can be stopped smoothly without causing slack or abnormal tension. You can

Next, the operation when the power supply is stopped due to some abnormality (power failure, etc.) during the high speed fast forward rewind operation will be described. At this time as well, the tape can be smoothly stopped without causing slack or abnormal tension, just like the way of stopping when the stop command is issued.

As described above, according to this embodiment, not only the tension control mechanism can also serve as the main brake, but also a stable brake torque can be obtained because of the band brake.

The first structure of the present invention uses the supply side tension control mechanism of the second structure to eliminate the supply side main brake of the conventional example, and the structure and operation are the same as those of the second structure described above.
The description is omitted because it is the same as the configuration of

Next, another embodiment of the first structure and the second structure of the present invention will be described (FIG. 4). Both the first end portion 53a and the second end portion 53b of the first tension band 53 are engaged with the first tension arm 54. When the supply reel base 12 rotates in the delivery direction, the first end 5
The tension T1 generated in 3a and the tension T2 generated in the second end portion 53b are T1 <T2.

[0046]

(Equation 7)

[0047]

[Equation 8]

[0048]

[Equation 9]

It becomes First of the first tension band 53
The rotation torque T1 · L _{2 at} which the end portion 53a grips the first tension arm 54, and the second tension of the first tension band 53
The rotational torque T2 · L _{3 held by} the end portion 53b of the first tension arm 54 is T1 · L ₂ > T2 · L ₃ , and therefore L ₂ > L ₃ . Regardless of the values of μ and θ, eμθ ≧ 1, so from equation (9) above, Φ _S1
≧ Φ _S2 . That is, the braking load in the feeding direction (clockwise direction) is larger than that in the winding direction (counterclockwise direction). Therefore, just as in the case of the second configuration, not only the tension control mechanism can also serve as the main brake, but also a stable brake torque can be obtained because of the band brake.

Next, the fourth structure of the present invention and its operation will be described. FIG. 5 is a plan view of the main parts when the magnetic recording / reproducing apparatus having the fourth structure of the present invention is in the recording / reproducing mode.
FIG. 7 is a plan view of the main part when the same is in the high-speed fast-forward rewind mode.

The supply reel base 12 is provided with irregularities 30 which are periodic in the circumferential direction. A light emitting element 31 and a light receiving element 32 are provided such that the unevenness is sandwiched by 30. Light emitting element 3
1 and the light receiving element 32 constitute the detecting means 52. In addition, the light emitting element 31 is provided on a part of the first tension arm 33.
There is a bent portion 33a that can pass between the light receiving element 32 and the light receiving element 32. The uneven portion 30 provided on the supply reel base 12, the bent portion 33a of the first tension arm 33, and the light emitting element 3
As shown in FIG. 9, the height relationship between the light receiving element 32 and the height of the light receiving element 32 is at an intermediate position between the light emitting element 31 and the light receiving element 32.
(Precisely, the tip of the convex portion) is provided, and the bent portion 33a extends to the lower portions of the light emitting element 31 and the light receiving element 32. Therefore, the output of the light receiving element 31 repeats the output A as shown in FIG. 10 when the uneven portion 33a passes between the light emitting element 31 and the light receiving element 32, and outputs B when the bent portion 33a comes.
It is supposed to be. As shown in the schematic block diagram of FIG. 11, when the detection means 52 outputs the output B, the first control means 34 immediately causes the drive circuit 35 to operate and the drive of the capstan motor 8 is cut off. . Further, the winding diameter of the tape 2 wound around the supply reel base 12 is determined by the output of the rotation synchronizing signal detecting means 50 for detecting the rotation synchronizing signal (not shown) of the capstan motor 8 and the output B of the detecting means 52. Second control means 51 is provided for calculating and controlling the rotation speed of the capstan motor 8 according to the winding diameter. The other detailed structure is the same as that of the supply-side tension control mechanism of the second structure of the present invention, and therefore its explanation is omitted.

The take-up reel stand 14 and the second tension arm 39 also have the same uneven portion 36 and bent portion 39a, and are similarly provided with a light emitting element 37 and a light receiving element 38. The light emitting element 37 and the light receiving element 38 constitute the detecting means 52. Further, unlike the conventional example, the light emitting element 16 for detecting the start and end of the tape and the light receiving elements 17, 18 for detecting the start and end of the tape are not provided. Other configurations are the same as the above-described second configuration of the present invention, and therefore description thereof will be omitted.

Next, the operation will be described. Since the basic operation is the same as the second configuration of the present invention, only the characteristic operation of the fourth configuration will be described. In the recording / reproducing mode and the high-speed fast-forward / rewind mode, the first tension arm 33
As shown in FIG. 7, the bent portion 33a has the light emitting element 3
The tape 2 is controlled so as to have a predetermined tension at a position which is not between 1 and the light receiving element 32.

Since the uneven portion 30 of the supply reel base 12 passes between the light emitting element 31 and the light receiving element 32, the output of the light receiving element 32 periodically outputs the output A as shown in FIG. By the output B detected by the detecting means 32 and the rotation synchronizing signal (not shown) of the capstan motor 8 detected by the rotation synchronizing signal detecting means 50, the supply reel base 1 is
Since the winding diameter of the tape 2 wound around the tape 2 is calculated and the second control means 51 controls the rotation speed of the capstan motor 8 according to the winding diameter, in the high-speed fast-forward rewind mode, Tape 2 is running at optimal speed.

From this state, when the tape 2 reaches the end, the tape 2 cannot be further extended, the tension of the tape 2 increases, the first tension arm 33 pivots largely, and the bending portion 33a emits light. It comes to be located between the element 31 and the light receiving element 32. Then, the light emitting element 31 outputs the output B as shown in FIG.
The driving force of the capstan motor 8 is immediately cut off by the first control means 34, and the tape 2 stops running.

Further, even when the supply reel base 12 cannot be rotated due to some trouble and the tension of the tape 2 becomes abnormally large, the first tension arm 33 also rotates and the light emitting element 31 and the light receiving element 32 are similarly rotated. Since the bent portion 33a is provided therebetween, the running of the tape 2 can be stopped before the tape 2 is severely broken. Since the operation of the winding side tension control mechanism is exactly the same, the description is omitted.

As described above, when the fourth structure of the present invention is used, not only the main brake can be eliminated, but also the rotation detecting means of the reel base, which is commonly used, can be used. Can be detected, or the abnormal tension of the tape 2 can be detected to stop the running of the tape 2 before a serious trouble occurs.

According to a fifth structure of the present invention, in the third structure or the fourth structure, a position where a head of a rotary cylinder equipped with a head for recording / reproducing a video signal or an audio signal starts contacting with a tape The tape running distance from the position where the tape starts to be unwound from the reel becomes longer than the distance in the longitudinal direction of the end detection tape provided in the cassette, and the head of the rotary cylinder ends contact with the tape. The rotating cylinder is provided at a position where the tape running distance from the position where the tape starts to be wound on the take-up reel is longer than the distance in the longitudinal direction of the start end detecting tape provided in the cassette. With this configuration, even if all the transparent tape is taken out, the connecting portion between the tape and the transparent tape does not hit the head provided on the cylinder, so that there is no risk of the head being damaged.

Next, the third structure of the present invention will be described. This is because when the rotation of the reel stand such as the light emitting element and the light receiving element is not detected, the bent portion 40a is provided in the first tension arm 40, and the position where the first tension arm 40 is rotated by the abnormal tension of the tape 2 is set to the switch 41. Is performed by using (FIGS. 12 and 13). The operation is the same as in the case of the fourth configuration of the present invention, and therefore the description thereof is omitted.

As described above, when the third structure of the present invention is used, not only the main brake can be eliminated, but also the start and end ends of the tape 2 can be removed without using a generally expensive light emitting element or light receiving element. Before detecting a problem or detecting an abnormal tension in the tape 2 and causing a major trouble, the tape 2
Can stop running.

In the third and fourth configurations of the present invention, both the supply side tension control mechanism and the winding side tension control mechanism are new, but it is clear that only one of them may be used. Is. Further, in the present invention, the high-speed fast-forward rewind mode and the stop mode are described as the same,
It goes without saying that another mode may be used.

[0062]

As is apparent from the above description, in the first configuration of the present invention, the braking load when the supply reel base rotates in the feeding direction becomes larger than the braking load when the supply reel base rotates in the winding direction. A tension band that acts on the tape, a first position that works so that the tape tension in the tape running path reaches a predetermined value in the recording / reproducing mode, and a predetermined braking force is applied to the supply reel base in the stop mode. Second to work
The tension band can be used as the main brake on the supply side without changing any other parts because the biasing means that can selectively move the position and position is provided. The effect is that you can go down. Further, as compared with the conventional main brake of the block brake, the brake torque is stable even if the positional relationship and the friction coefficient vary, so that it can function as a highly reliable supply side main brake. In addition, even if the power supply is suddenly stopped during high-speed fast-forward rewinding (due to a power failure, etc.), the tape running can be stopped without causing tape slack or abnormal tension, just as in the normal stop operation. Very good in terms of protecting the tape.

In addition, in the second configuration of the present invention, in addition to the first configuration, the braking load when the take-up reel base rotates in the feed-out direction becomes larger than the braking load when it rotates in the winding direction. The second configuration of the present invention is provided with the second tension band that works as described above and the second biasing unit that works so that the second tension band applies a predetermined braking force to the take-up reel base in the stop mode. In addition to the effect of the above, since the second tension band can be used as the winding side main brake, not only the winding side main brake is unnecessary, but not only the cost can be reduced,
The high-speed fast-forward rewind mode and the stop mode can be set in the same mode, and the device itself can be easily configured.

Similarly, in the third structure of the present invention, in addition to the second structure of the present invention, when the motor is driving the tape, an abnormal position where the tension arm rotates by a predetermined tension or more is detected. Since the detection means and the control means for stopping the driving of the motor by the output of detecting the abnormal position of the detection means are provided, in addition to the effect of the second configuration of the present invention, an expensive light emitting element or light receiving element is not used. However, it is possible to detect the beginning and end of the tape and to detect the abnormal tension of the tape to stop the running of the tape before a serious trouble occurs.

Similarly, in the fourth structure of the present invention, in addition to the second structure of the present invention, when the motor is driving the tape, the tension arm rotates by a tension of a predetermined value or more and the supply reel. Since the detection means for detecting a periodic rotation signal synchronized with the rotation of the table and the control means for stopping the driving of the motor by the output of the detection means detecting the abnormal position of the tension arm are provided, the second aspect of the present invention is provided. In addition to the effect of the configuration, the start and end of the tape can be detected only by the rotation detection means of the commonly used reel stand,
There is an effect that the abnormal tension of the tape can be detected and the running of the tape can be stopped before a serious trouble occurs.

[Brief description of drawings]

FIG. 1 is a plan view of an essential part when a second invention is in a recording / reproducing state.

FIG. 2 is a plan view of an essential part when the second invention is in a high-speed fast-forward rewinding state.

FIG. 3 is an explanatory view of specifications of a tension control mechanism of the second invention.

FIG. 4 is an explanatory view of specifications of a tension control mechanism according to another embodiment of the first and second inventions.

FIG. 5 is a plan view of an essential part when the fourth invention is in a recording / reproducing state.

FIG. 6 is a plan view of a main portion when a fourth invention is in a high-speed fast-forward rewinding state.

FIG. 7 is a plan view of a tension control mechanism of a fourth invention.

FIG. 8 is a plan view of a tension control mechanism at the end of the tape.

FIG. 9 is a sectional view of a main part of a tension control mechanism of a fourth invention.

FIG. 10 is an explanatory diagram of light receiving element output.

FIG. 11 is a schematic block diagram of a fourth invention.

FIG. 12 is a plan view of a tension control mechanism of a third invention.

FIG. 13 is a cross-sectional view of a main part of a tension control mechanism of a third invention.

FIG. 14 is a plan view of a main part when the conventional example is in a recording / reproducing state.

FIG. 15 is a plan view of a main part of a conventional example in a high-speed fast-forward rewinding state.

FIG. 16 is an explanatory view of specifications of a conventional tension control mechanism.

[Explanation of symbols]

 2 tape 3 cylinder 8 capster motor 9 capstan 10 pinch roller 11 supply reel 12 supply reel stand 13 take-up reel 14 take-up reel stand 19 first tension post 20 first tension band 21 first tension arm 23 first tension Spring 24 Spring hooking arm 25 Second tension post 26 Second tension band 27 Second tension arm 28 Second tension spring 31 Light emitting element 32 Light receiving element 34 First control means 35 Drive circuit 50 Rotation synchronization signal detecting means 51 Second control means 52 detection means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiromi Amano 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Kazuki Tanabe, 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. 72) Inventor Shoji Kawahara 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (5)

[Claims] 1. A magnetic recording / reproducing apparatus for performing recording / reproducing and high-speed fast-forward rewinding operation by winding a tape contained in a cassette having a supply reel and a take-up reel on a rotating cylinder to form a tape traveling path. At
When a tension post that comes into contact with the tape in the tape running path and a supply reel base that rotates integrally with the supply reel are given a predetermined angular winding braking load, and the supply reel base rotates in the delivery direction, A tension band having a first end portion where the tension generated by the braking load is smaller than the tension generated at the other end, and a second end portion where the tension generated by the braking load is larger than the tension generated at the other end, and the tension post is mounted. However, the tension post is rotatable according to the tension of the tape with which it abuts, at least one end of the first end and the second end of the tension band is engaged, and the rotation generated by the first end is performed. A tension arm having a dynamic torque larger than a rotational torque generated by the second end, Is engaged with the tension arm and operates in a recording / reproducing mode so that the tension of the tape in the tape traveling path reaches a predetermined value. And a biasing means capable of selectively moving the second position which acts so as to apply the braking force of the magnetic recording / reproducing apparatus. 2. A magnetic recording / reproducing apparatus for performing recording / reproducing and high-speed fast-forward rewinding operation by winding a tape contained in a cassette having a supply reel and a take-up reel on a rotating cylinder to form a tape traveling path. At
When a first tension post that comes into contact with the tape in the tape running path and a supply reel base that rotates integrally with the supply reel are given a predetermined angular winding braking load, and the supply reel base rotates in the delivery direction. A first tension band having a first end portion in which a tension generated by the braking load is smaller than a tension generated in the other end, and a second end portion in which a tension generated by the braking load is larger than a tension generated in the other end, A first tension post is mounted and is rotatable according to the tension of the tape with which the first tension post abuts.
At least one end of the end portion is engaged, and a first tension arm in which a turning torque generated by the first end portion is larger than a turning torque generated by the second end portion, and one end is formed in the first tension arm. When engaged and in the recording / reproducing mode, the first position acts so that the tension of the tape in the tape traveling path reaches a predetermined value, and in the stop mode, a predetermined braking force is applied to the supply reel base. First biasing means capable of selectively moving a second position that works so as to act, a second tension post that abuts the tape in the tape traveling path, and a take-up reel stand that rotates integrally with the take-up reel. When a predetermined angular winding braking load is applied to the winding reel base and the take-up reel base rotates in the feeding direction, the tension generated by the braking load becomes smaller than the tension generated at the other end. A second tension band having a first end and a second end having a tension generated by a braking load larger than a tension generated at the other end, the second tension post is mounted, and the second tension post is in contact with the second tension band. The second tension band is rotatable according to the tension of the tape,
A second tension arm in which at least one end of the end is engaged, and a turning torque generated by the first end of the second tension band is larger than a turning torque generated by the second end of the second tension band. And a second urging means for engaging one of the second tension arms with the second tension arm so that a predetermined braking force is applied to the take-up reel stand in the stop mode. . 3. A magnetic recording / reproducing apparatus for performing recording / reproducing and high-speed fast-forward rewinding operation by winding a tape contained in a cassette having a supply reel and a take-up reel on a rotating cylinder to form a tape traveling path. A driving motor for driving the tape, a tension post that abuts the tape in the tape traveling path, a supply reel stand that rotates integrally with the supply reel, and applies a predetermined angular winding braking load to the supply reel. When the platform rotates in the delivery direction, a first end portion in which the tension generated by the braking load is smaller than the tension generated in the other end and a second end portion in which the tension generated by the braking load is larger than the tension generated in the other end are provided. It has the tension band and the tension post, and the tension post touches The tension band is rotatable according to the tension of the tape, and at least one end of the first end and the second end of the tension band is engaged, and the rotation torque generated by the first end is the second end. A tension arm having a torque larger than the rotational torque generated by the section, and one end of which engages with the tension arm, and works so that the tension of the tape in the tape traveling path becomes a predetermined value in the recording / reproducing mode. A biasing means capable of selectively moving a position and a second position in the stop mode, which acts so as to apply a predetermined braking force to the supply reel base; and when the motor is driving the tape, Detecting means for detecting an abnormal position in which the tension arm rotates due to a predetermined tension or more, and control for stopping the driving of the motor by an output detecting the abnormal position of the detecting means. And a magnetic recording and reproducing device. 4. A magnetic recording / reproducing apparatus for performing recording / reproducing and high-speed fast-forward rewinding operation by winding a tape contained in a cassette having a supply reel and a take-up reel on a rotating cylinder to form a tape traveling path. In which the motor drives the tape to generate a rotation synchronizing signal according to the rotation of the tape, the tension post that abuts the tape in the tape running path, and the supply reel base that rotates integrally with the supply reel is wound at a predetermined angle. When a braking load is applied and the supply reel base rotates in the delivery direction, a first end portion in which the tension generated by the braking load is smaller than the tension generated in the other end, and a tension generated in the other end by the braking load A tension band having a larger second end and the tension post. The tension post is rotatable according to the tension of the tape with which the tension post abuts, and at least one end of the first end and the second end of the tension band is engaged and caused by the first end. A tension arm whose turning torque is greater than the turning torque generated by the second end, and one end of which engages with the tension arm, and in the recording / reproducing mode, the tension of the tape in the tape running path is predetermined. And a second position that acts so as to apply a predetermined braking force to the supply reel base in the stop mode, and the motor is configured to move the first position. When the tape is driven, the tension arm detects an abnormal position where the tension arm rotates by a predetermined tension or more, and a periodic rotation signal synchronized with the rotation of the supply reel base. A first control means for stopping the driving of the motor by an output obtained by the detection means detecting an abnormal position of the tension arm; and a first control means for performing a high-speed fast-forward rewind operation. A second control means for calculating the position of the tape based on a rotation synchronization signal of the motor and a rotation signal of the supply reel base, and controlling the rotation speed of the motor according to the position. Recording / playback device. 5. A tape traveling distance between a position where a head of a rotary cylinder equipped with a head for recording and reproducing a video signal or an audio signal starts to come into contact with the tape and a position where the tape starts to be fed from a supply reel is provided in a cassette. It becomes longer than the distance of the end detection tape in the longitudinal direction,
Further, the tape running distance between the position where the head of the rotary cylinder comes into contact with the tape and the position where the tape starts to be wound on the take-up reel is longer than the distance in the longitudinal direction of the start end detecting tape provided in the cassette. The magnetic recording / reproducing apparatus according to claim 3 or 4, wherein the rotating cylinder is provided at a position where it becomes longer.