JPH0785535A - Tape loading mechanism - Google Patents

Abstract

PURPOSE:To prevent the occurrence of damage to a tape by braking a reel base on a tape returning side and reducing a tension applied to the tape at the time of unloading. CONSTITUTION:A braking mechanism is installed on a supply reel base 7 for supplying the tape 4 at a playback time. In the case of loading the tape 4 on a cylinder 6, a takeup reel base 8 is locked, and the brake is applied to the supply reel base 7. And also, in the case of unloading the tape 4, a weak brake is applied to the supply reel base 7 by the braking mechanism. When the rewinding torque is applied to the supply reel base 7 in such a state, the tension of the tape 4 being on the way of rewinding is reduced, so that the tape 4 is stably guided by a tape pull-out means including tape pull-out posts 19 and 20 and inclined posts 25 and 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape loading mechanism in a magnetic recording / reproducing apparatus such as a cassette type video tape recorder (VTR).

[0002]

2. Description of the Related Art A tape loading mechanism provided in a conventional VTR will be described with reference to FIGS. FIG. 10 shows a V including a conventional tape loading mechanism.
It is a top view of TR. In this figure, the cassette 71 has a supply reel 72 and a take-up reel 73, and a signal recording / reproducing tape 74 is wound and stored.

The VTR chassis 75 is provided with a cylinder 76 for helically winding and scanning the tape 74, and a supply reel stand 77 and a take-up reel stand 78 are provided at the seating position of the cassette 71. . And cylinder 7
Along the left and right guide grooves 79, 80 provided around 6
First tape pull-out means 81, second tape pull-out means 82
Are movably mounted.

FIG. 11 is a perspective view showing the structure of the first tape pull-out means 81. As shown in FIGS. 10 and 11, tape pull-out posts 83 and 84 are attached to the first tape pull-out means 81 and the second tape pull-out means 82, respectively. The tape pull-out post 83 pulls out the tape 74 from the supply reel 72 in the cassette 71 at the time of loading (mounting), guides the tape 74 to the cylinder 76, and winds the tape 74 around the tape sliding surface of the cylinder 76. Is. As shown in FIG. 11, the tape pull-out post 83 includes an upper flange 83 a that is press-fitted in an upper portion of the post shaft 85, a roller 83 b that is fitted in a central portion of the post shaft 85, and a lower end that is press-fitted in a lower portion of the post shaft 85. It has a flange 83c.

An inclined post 86 is attached to the first tape pull-out means 81. The inclined post 86 is a post that is inclined with respect to the tape pull-out post 83 and guides the recording surface of the tape 74 to be parallel to the tape sliding surface of the cylinder 76. Second tape pull-out means 82 in FIG.
Also, similarly to the first tape pull-out means 81, a tape pull-out post 84 and an inclined post 87 are attached. The tilted post 86 is tilted in the direction in which the tip end thereof is close to the tape pull-out post 83, whereas the tilted post 87 is tilted in the direction in which the tip end is separated from the tape pull-out post 84.

When the cassette 71 is not attached to the VTR, the first tape pull-out means 81 and the second tape pull-out means 82 are in the position A shown by the solid line in FIG. 10, and the tape 74 is loaded in the cylinder 76. In the
It is located at position B shown by the chain double-dashed line. In this way, the tape pull-out means 81, 82 are set at the position A in the cassette 71 and the tape 7
4 reciprocates between the position B wound on the cylinder 76 and the position B.

The operation of the conventional tape loading mechanism constructed as above will be described. First, the first tape pull-out means 81 and the second tape pull-out means 82 are shown in FIG.
The operation at the time of loading from the position A indicated by the solid line 0 to the position B indicated by the chain double-dashed line will be described. Cassette 71
Is attached to a predetermined position, the first tape pull-out means 8
The first and second tape pull-out means 82 are driven by a loading motor (not shown), and move to the cylinder 76 side along the guide grooves 79 and 80, respectively. At this time, a brake mechanism (not shown) on the supply side operates to apply a brake that does not hinder the withdrawal of the tape 74 from the supply reel stand 77.
Shall be given to.

Further, the take-up reel base 78 is more strongly braked than the supply reel base 77 by another brake mechanism (not shown). In this way, the brake is applied to both the supply-side and take-up-side reel bases so that the tape pull-out posts 83, 8
This is to prevent the tape 74 from being excessively pulled out and loosened when the tape 74 is pulled out from the cassette 71. The reason why the strength of the brake is changed between the supply side and the winding side is that the tape 74 can be pulled out only from the supply reel 72.

Next, the operation at the time of unloading (dismounting) in which the first tape pull-out means 81 and the second tape pull-out means 82 move from the B position to the A position will be described.
At the time of unloading, the brake mechanism on the supply side is deactivated and the supply reel base 77 is not braked. The brake is applied to the take-up reel base 78 as in the loading. The reason why the take-up reel stand 78 is braked in this way is to prevent the tape 74 from being pulled out from the take-up reel 73 when the tape 74 is taken up.

[0010]

However, in such a conventional structure, although a stable running path is formed with respect to the tape 74 at the B position where loading is completed, the tape moves between the A position and the B position. When loading or unloading, the road becomes unreasonable. That is, when the tape 74 is run, since the tape 74 is wound around the cylinder 76 at the position B, the tape 74 runs from one reel without twisting, and when entering the other reel, there is a height shift or a horizontal direction. Drive without tilting from. On the other hand, at a position midway between the A position and the B position, the tape 74 is not sufficiently wound around the cylinder 76, so that the tape 74 may be twisted or the position may change as the tape travels.

This is a cylinder 76, a tape pull-out post 8
3, 84, and the inclined posts 86, 87, the tape pull-out posts 83, 8 from the position B, even if the stable running path is formed at the position B, are set.
This is because the positional relationship for forming a stable traveling path is lost when the 4 and the inclined posts 86, 87 are moved.
For this reason, when the tape 74 is loaded from left to right in FIG. 10, the tip ends of the inclined posts 86 and 87 are tilted to the left side. It falls below the height. For this reason, there is a fear that the tape 74 may enter the tape pull-out post 84 which should enter horizontally from below.

Further, when the tape 74 travels from right to left during unloading, the approaching directions for the inclined posts 87, 86 are reversed, so the inclined posts 87, 86 are inclined.
The tape 74 rises above the original running height while passing through. For this reason, the tape pull-out post 8 which should enter horizontally
There was a fear that the tape 74 would enter the tape 3 from above.

Therefore, the tape 74 receives a downward force at the time of loading to move to the lower side of the tape pull-out post 84, and at the time of unloading to move to the upper side of the tape pull-out post 84 by an upward force. Tape pull-out post 8
Since 3 and 84 have the flanges as shown in FIG. 11,
Generally, the tape 74 is prevented from moving in the vertical direction. At this time, whether or not the tape will be damaged depends on the magnitude of the tension applied to the tape 74. The tension applied to the tape 74 at the time of loading is equal to the brake torque of the supply reel base 77 divided by the tape winding radius of the supply reel 72. Since the brake is weak, the tension is small and the tape is not damaged. There wasn't.

However, at the time of unloading, the tape 74
The tension applied to is equal to the torque transmitted to the supply reel base 77 divided by the tape winding radius of the supply reel 72. Since this value is larger than that at the time of loading, the end portion of the tape 74 is strongly pressed against the upper flange 83a during movement and the tape 74 buckles or bends and enters the gap between the upper flange 83a and the roller 83b. However, there is a problem that a large tape may be damaged.

The present invention has been made in view of the above conventional problems, and a brake is applied to the reel stand on the side where the tape is returned at the time of unloading to reduce the tape tension and prevent the occurrence of damage to the tape. It is a first object to realize a tape loading mechanism that operates. Furthermore,
A common brake mechanism is used to brake the supply reel base during loading and unloading, and the strength of the brake is changed to greatly reduce the tension applied to the tape during unloading. A second object is to realize a tape loading mechanism that surely prevents the occurrence of damage to the tape.

[0016]

According to a first aspect of the present invention, there is provided a tape drawing means for drawing a tape from a cassette, a first position where the tape is accommodated in the cassette and a second position where the tape is wound around a cylinder. Drive means for reciprocally moving the tape pulling means to and from the position, and the tape pulling means moves the tape to the second position.
And a first braking means for applying a brake to the reel base on the side where the tape is rewound during unloading to move from the position to the first position.

According to the invention of claim 2 of the present application, the tape is provided between the tape withdrawing means for withdrawing the tape from the cassette, and the first position where the tape is accommodated in the cassette and the second position where the tape is wound around the cylinder. A driving means for reciprocating the drawing means and a tape drawing means for applying a brake to the reel base for supplying the tape at the time of loading for moving the tape from the first position to the second position, and the tape drawing means for the second position. From the second position to the first position, the second brake means applies a stronger brake to the reel base on the side where the tape is rewound than when loading the reel base.

[0018]

According to the invention of claim 1 of the present application having such characteristics, when the tape is loaded into the cylinder,
The tape pull-out means pulls out the tape from the cassette. At this time, the tape easily comes off from the tape pull-out means, so the brake is applied to the reel base for supplying the tape. In this way, the tape is stably guided from the first position to the second position. When the tape is unloaded from the cylinder, a large rewinding torque is applied to the reel stand for rewinding the tape. At this time, the tension of the tape becomes higher than that at the time of loading, and the running becomes unstable. Therefore, the reel base is braked by the first braking means. In this way, the tape is stably guided from the second position to the first position.

According to the invention of claim 2 of the present application, when the tape is mounted on the cylinder, the tape pull-out means pulls out the tape from the cassette. At this time, the tape takes an unstable running path and easily comes off from the tape pull-out means. When the second brake means brakes the reel base that supplies the tape, the tape is stably guided from the first position to the second position. When the tape is unloaded from the cylinder, a large rewinding torque is applied to the reel stand for rewinding the tape. At this time, the tension of the tape becomes high and the running becomes unstable. Therefore, the second brake means applies a stronger brake to the reel base than during loading. This will cause the tape to move from the second position to the first.
Stable guidance will be provided. Also, the brake mechanism can be shared during loading and unloading.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A tape loading mechanism according to a first embodiment of the present invention will be described below with reference to FIGS. The structure of the VTR including the tape loading mechanism of the first embodiment is the same as that shown in FIG. 10, and the brake mechanism shown in FIGS. 4 and 5 is also the same as the conventional example. The difference from the conventional example is that the operation timing of the brake applied to the supply reel base is changed.

FIG. 1 is a plan view showing the structure of a VTR including the tape loading mechanism of this embodiment. In this figure, a cassette 1 has a supply reel 2 and a take-up reel 3, and a signal recording / reproducing tape 4 is wound and stored in a first position.

On the other hand, the tape 4 is attached to the chassis 5 of the VTR.
A cylinder 6 for helically winding is provided, and a supply reel base 7 and a take-up reel base 8 are provided at the seated position of the cassette 1. Stopper pins 9 and 10 are erected on the chassis 5 on the left and right rear sides of the cylinder 6. The stopper pin 9 is attached to the end of the left guide groove described later, and the stopper pin 10 is attached to the end of the right guide groove.

FIG. 2 is a perspective view showing the structure of the first tape pull-out means including the slide base 11. The slide base 11 is a flat plate-like member that moves along the upper surface of the chassis 5 on the left side of the cylinder 6, and has two guide pins 13 and 14 mounted downward on the lower surface thereof. Similarly to the first tape pull-out means, the second tape pull-out means shown in FIG. 1 has two guide pins 1 on the lower surface of the slide base 12.
5, 16 are attached. Slide base 11,1
In one side surface of 2, the concave portions 17, 18 cut out in a V shape are formed.
Are formed respectively. The recess 17 comes into contact with the stopper pin 9 with the tape 4 loaded in the cylinder 6,
The recess 18 contacts the stopper pin 10.

As shown in FIG. 1, the slide bases 11, 1
Tape pull-out posts 19 and 20 are attached to the upper surface of 2, respectively. The tape pull-out post 19 pulls out the tape 4 from the supply reel 2 in the cassette 1 at the time of loading,
The tape 4 is guided to the cylinder 6 and the tape 4
Is guided to a second position where the tape is wound around the tape sliding surface of the cylinder 6. As shown in FIG. 2, the tape pull-out post 19 includes an upper flange 22 press-fitted onto an upper portion of a post shaft 21 provided upright on the slide base 11 and a post shaft 21.
Roller 23 fitted in the central part of the post shaft 2
1 and a lower flange 24 that is press-fitted in the lower part.

The spacing between the upper flange 22 and the lower flange 24 of the tape pull-out post 19 is set to be slightly larger than the width of the tape 4 so that the tape 4 does not come off the tape pull-out post 19 during loading or unloading. It is for regulation. Also, the upper flange 22
Is in contact with the upper end of the tape 4 at the position B shown by the chain double-dashed line, and plays a role of controlling the tape 4 to run stably at a constant height.

Further, inclined posts 25 and 26 are attached to the upper surfaces of the slide bases 11 and 12, respectively. As shown in FIG. 2, the inclined posts 25 are tape pull-out posts 19
The post is inclined with respect to and guides the recording surface of the tape 4 to be parallel to the tape sliding surface of the cylinder 6. The tip of the inclined post 25 is the tape pull-out post 1
9, the inclined post 26 is inclined in a direction in which the tip end is separated from the tape pull-out post 20.

Next, guide grooves 27, 28 are cut out in the chassis 5 around the cylinder 6. The guide groove 27 is provided when loading or unloading the tape 4.
A groove for moving the slide base 11, which engages with the guide pins 13 and 14, and conveys the first tape pull-out means by a driving device (not shown). The guide groove 28 is also a groove for moving the second tape pull-out means including the slide base 12 when loading or unloading the tape 4, and engages with the guide pins 15 and 16. When the cassette 1 is not attached to the VTR, the slide base 11,
12 is at the position A shown by the solid line in FIG. 1, and in the state where the cylinder 6 has loaded the tape 4, B shown by the chain double-dashed line
In position. In this way, the left and right tape pull-out means reciprocate between the A position inside the cassette 1 and the B position where the tape 4 is wound around the cylinder 6. In this way, the guide grooves 27 and 28 and the stopper pins 9 and 10 together with a drive source (not shown) constitute a drive means for driving the tape pull-out means to the A position and the B position.

FIG. 3 is a front view of the reel base portion on the supply side. Here, only the supply side will be described, but the winding side has the same configuration. In FIG. 3, the supply reel base 7 is rotatably supported by a reel base shaft 36 provided upright on the chassis 5. The gear 34 is a gear fitted onto the shaft portion 31 of the supply reel base, and transmits the rotation to the flange portion 32 integrated with the supply reel base 7 via the friction member 35. The compression spring 33 is the shaft portion 31 of the supply reel stand 7.
Is attached to the outer circumference of the gear and urges the gear 34 downward.
The strength of the compression spring 33 determines the torque transmitted to the supply reel base 7.

4 and 5 are plan views showing the structure of the supply side brake mechanism (first braking means). Figure 4,
As shown in FIG. 5, a cam 41 is mounted near the supply reel base 7 so as to be rotatable around a cam shaft 43. The cam 41 has a cam groove 42 whose turning radius gradually changes.
Are formed. The slider 44 is a rod-shaped member that is movably held in a predetermined range in the left-right direction and has a long groove 46 formed along its long axis. The slider 44 is connected to the cam groove 42 via a driven pin 45 attached to the left end portion thereof. Engaged. The cam shaft 43 and the slider guide pin 48 are fitted into the long groove 46 of the slider 44, and the slider 44 is held so as to be finely movable in the left-right direction. A brake release pin 47 is erected on the right end of the slider 44, and a brake lever 49
Has a function to open.

Next, the brake lever 49 is moved to the supply reel stand 7
It is attached so as to come into contact with or separate from the outer peripheral portion of the. The brake lever 49 has a brake shoe 5 at one end.
0 is attached and is rotatable around the brake shaft 51. A tension spring 52 is attached to the brake lever 49 at a position opposite to the flexure shoe 50, and is stretched by a spring hook pin 53 fixed to the chassis 5.

In this way, the brake lever 49 is urged to rotate clockwise by the tension spring 52, and when the brake release pin 47 does not contact the rear end of the brake lever 49 as shown in FIG. The supply reel base 7 receives the braking force. Further, as shown in FIG. 5, when the slider 44 slides to the left from the position of FIG. 4, the brake release pin 47 contacts the rear end of the brake lever 49, rendering the brake mechanism inoperative. This brake mechanism takes two states, a brake operating state shown in FIG. 4 and a non-operating state shown in FIG. 5, depending on the rotation phase of the cam 41. It should be noted that the take-up reel base 8 is provided with a brake mechanism similar to that shown in FIGS. 4 and 5, or with a brake mechanism that merely locks the take-up reel base 8.

The operation of the tape loading mechanism of the first embodiment constructed as above will be described. First, the operation at the time of loading when the slide bases 11 and 12 move from the position A to the position B in FIG. 1 will be described. When the cassette 1 is loaded at a predetermined position in FIG. 1, the guide pins 13 and 14 are driven by driving means (not shown), and the slide base 11 moves toward the cylinder 6 along the guide groove 27. Similarly, the slide base 12 also moves to the cylinder 6 side along the guide groove 28. At this time, the brake mechanism on the supply side is brought into the operating state shown in FIG.

A brake mechanism (not shown) applies a brake to the take-up reel base 8 to the extent that the supply reel base 7 is locked. At this time, as the slide bases 11 and 12 move, the tape pull-out posts 19 and 20 pull out the tape 4 only from the supply reel 2 of the cassette 1 and wind it around the cylinder 6. The tape 4 runs from left to right in FIG. 1 during loading, but the tension applied to the tape 4 during loading can be reduced by weakening the brake applied to the supply reel base 7. Therefore, the tape 4 is the inclined post 2
At 5, 26, the downward movement force is weakened, and the tape is not damaged. After the recesses 17 and 18 are engaged with the stopper pins 9 and 10, the slide pins 11 and 12 are positioned by contacting the guide pins 14 and 16 with the inner circumferences of the guide grooves 27 and 28, and the loading of the tape 4 is completed. To do. Next, the brake mechanism is set to a non-operating state on both the supply side and the winding side, and a signal is recorded or reproduced on the tape 4 wound around the cylinder 6.

Next, the operation at the time of unloading the slide bases 11 and 12 moving from the B position to the A position will be described. At the time of unloading, the slide bases 11 and 12 are driven in the direction opposite to that at the time of loading and move along the guide grooves 27 and 28. With the start of unloading, the brake mechanism on the supply side is operated in the procedure shown in FIG. That is, the supply reel base 7 is weakly braked as shown in FIG. A brake is applied to the take-up reel base 8 to such an extent that the tape 4 is not pulled out from the take-up reel 3. Next, the supply reel base 7 is rotated counterclockwise.

Although the tape 4 loosens as the slide bases 11 and 12 move toward the cassette 1, the loosened tape 4 is supplied to the supply reel by the rotation of the gear 34 of FIG. 3 using the capstan motor as a drive source. It will be wound up on the 2 side. At this time, the tape 4 runs from right to left in FIG. In this way, the tension applied to the tape 4 during unloading can be reduced as compared with the conventional example by the amount of braking the supply reel base 7. For this reason tape 4
Becomes difficult to move upward due to the inclined posts 26 and 25,
Tape damage will not occur.

If the brake torque is larger than the torque transmitted to the supply reel base 7, the tape tension becomes negative and the loose tape 4 is not wound.
However, the brake torque is not set here. When the slide bases 11 and 12 are returned to the cassette 1 before long, the unloading is completed.

Next, a tape loading mechanism according to the second embodiment of the present invention will be described with reference to FIGS. The tape loading mechanism of this embodiment is provided in the same VTR as that of the first embodiment shown in FIGS.
Since the configuration other than the brake mechanism is the same, the illustration and the description of the structure are omitted. 7 to 9 are plan views showing the configuration of the brake mechanism (second brake means) provided in the tape loading mechanism of this embodiment. FIG. 7 is a brake weak operation state, FIG. 8 is a brake non-operation state, and FIG. FIG. 9 shows the strong brake operation states.

As shown in FIGS. 7 to 10, the supply reel base 7
A cam 61 is rotatably attached in the vicinity of. The cam 61 is formed with a cam groove 62 whose radius of rotation changes at least at three rotation angles. When the cam 61 rotates around the cam shaft 43, which is a rotating shaft, the slider 63 reciprocates left and right. The slider 63 is a rod-shaped member having a long groove 64 formed along its long axis, and a cam groove 62 is formed via a driven pin 45 axially supported at the left end of the slider 63.
Is engaged with. The cam shaft 43 and the slider guide pin 48 erected on the chassis 5 are fitted in the long groove 64 of the slider 63, and the slider 63 is held so as to be finely movable in the left-right direction. A brake release pin 47 is erected near the right end of the slider 63 and has a function of releasing the brake lever 49.

Next, the brake lever 49 moves to the supply reel stand 7
It is rotatably attached so as to come into contact with or separate from the outer peripheral portion of. A brake shoe 50 is attached to one end of the brake lever 49, and a tension spring 66 is attached to a position opposite to the brake shoe 50 sandwiching the brake shaft 51. A tension spring 66 is stretched between the slider 63 and a spring hooking pin 65 provided upright on the right end of the slider 63.

In this way, the brake lever 49 is biased by the tension spring 66 to rotate clockwise. As shown in FIGS. 7 and 9, when the brake release pin 47 does not contact the rear end of the brake lever 49, the supply reel base 7
Receives flexing power. For example, as shown in FIG. 7, when the driven pin 45 of the slider 63 engages with the cam groove 62 at the radius r2, the slider 63 moves slightly to the right of the reference position. At this time, the brake lever 49 is rotated clockwise by the moderate urging force of the tension spring 66, and the braking force on the supply reel base 7 is weakened.

As shown in FIG. 9, when the driven pin 45 of the slider 63 engages with the cam groove 62 at the radius r1, the slider 63 moves to the right more than the reference position.
At this time, the brake lever 49 is rotated clockwise by the large biasing force of the tension spring 66, and the braking force on the supply reel base 7 is increased. Next, as shown in FIG. 8, when the driven pin 45 of the slider 63 engages with the cam groove 62 at the portion having the maximum radius r3, the slider 63 moves to the left from the reference position. At this time, the brake release pin 47 contacts the brake lever 49, and the brake lever 49 rotates counterclockwise. In this case, the brake shoe 50 does not hit the supply reel stand 7, and the brake does not operate. As described above, the brake mechanism according to the present embodiment, according to the rotation phase of the cam 61,
There are three states: strong, weak, and non-moving.

The operation of the tape loading mechanism of the second embodiment constructed as above will be described. When the cassette 1 is mounted at a predetermined position as shown in FIG. 1, the slide bases 11 and 12 are driven as drive sources (not shown) to move along the guide grooves 27 and 28, respectively. At this time, the brake mechanism on the supply side is set to the weak operating state shown in FIG.
Apply a weak brake to the supply reel stand 7. Further, the take-up reel base 8 is braked more strongly than the supply reel base 7 by a brake mechanism (not shown). At this time, as the slide bases 11 and 12 move, the tape pull-out posts 19 and 20 pull out the tape 4 only from the supply reel 2 of the cassette 1 and wind it around the cylinder 6.

At the time of loading, the tape 4 generally runs from left to right in FIG. 1 and takes an unreasonable running path. If the supply reel base 7 is not braked, the tape 4 will enter from below from the tape pull-out post 20 that should enter horizontally, and the end of the tape 4 will fall into the lower flange of the tape pull-out post 20. It will be pressed. However, similarly to the first embodiment, the tension applied to the tape 4 can be reduced by weakening the brake applied to the supply reel base 7. Therefore, the tape is not damaged.

After the recesses 17 and 18 are engaged with the stopper pins 9 and 10, the guide pins 14 and 16 are inserted into the guide grooves 27 and
By contacting the inner circumference of 28, the slide bases 11, 1
2 is positioned, and loading of the tape 4 is completed. Next, the brake mechanism is put into a non-operating state on both the supply side and the winding side, and a signal is recorded or reproduced on the tape 4 wound around the cylinder 6.

Next, the operation at the time of unloading the slide bases 11 and 12 moving from the B position to the A position will be described. The slide bases 11 and 12 are driven in the opposite direction to that at the time of loading and move along the guide grooves 27 and 28. At this time, the supply-side brake mechanism is set to the strong operating state shown in FIG. 9, and the supply reel base 7 is strongly braked. Further, even if the loosening tape 4 is wound on the take-up reel base 8 by operating the brake mechanism, the take-up reel 3
Apply a brake to prevent tape 4 from being pulled out.

The tape 4 loosens as the slide bases 11 and 12 move, but the gear 34 shown in FIG. 3 rotates with the capstan as a drive source, so that the loose tape 4 is wound around the supply reel 2. Will be taken. At this time, the tape 4 runs from right to left in FIG. 1, but by applying a strong brake to the supply reel base 7, the tape tension can be greatly reduced. This eliminates tape damage. Incidentally, it is the same as in the first embodiment that the brake having a magnitude that makes the value of the tape tension negative is not applied. When the slide bases 11 and 12 are returned to the cassette 1 in this way, the unloading is completed.

In the first and second embodiments, the brake mechanism of the supply reel base 7 is not limited to the one described above, but various brake mechanisms can be used. Further, although the tape 4 is pulled out from the supply reel 2 at the time of loading and returned to the supply reel 2 at the time of unloading, even if the reel for pulling out the tape 4 or the reel for returning the tape 4 is the take-up reel 3, the tape is not damaged. It is possible to prevent. Further, in the brake mechanism of the second embodiment, the slider 63
Although the tension spring expands and contracts by changing the position of, and the strength of the brake changes, other methods may be used as long as the strength of the brake can be changed.

[0048]

As described above, according to the tape loading mechanism of the first aspect, when the tape is unloaded from the cylinder, the first brake means applies a weak brake to the reel base for supplying the tape. Therefore, even if a large winding torque is applied to the supply reel base, the tension applied to the tape of the cylinder becomes small. Therefore, the tape in the middle of rewinding is not strongly pulled by the tape pull-out means, and the tape can be prevented from being damaged.

Further, according to the tape loading mechanism of the second aspect of the present invention, when the tape is loaded on the cylinder, the second brake means applies a weak brake to the reel base for supplying the tape. Also, when unloading the tape from the cylinder, apply a stronger brake to the reel base that supplies the tape than during loading.
Therefore, even if a large winding torque is applied to the supply reel base, the tension applied to the tape of the cylinder becomes small. Therefore, the tape in the middle of rewinding is not strongly pulled by the tape pull-out means, and the tape can be prevented from being damaged. Further, the brakes at the time of loading and unloading the tape given to the reel stand can be given by one brake means, and it is not necessary to newly provide a different brake mechanism for applying two kinds of brakes. Therefore, the increase or change of the parts of the brake mechanism can be minimized.

[Brief description of drawings]

FIG. 1 is a plan view of a magnetic recording / reproducing apparatus including a tape loading mechanism according to first and second embodiments of the present invention.

FIG. 2 is a perspective view of tape pull-out means used in the tape loading mechanism of the first and second embodiments.

FIG. 3 is a front view of a reel stand attached to the magnetic recording / reproducing apparatus of the first and second embodiments.

FIG. 4 is a plan view showing an operating state (No. 1) of the brake mechanism attached to the tape loading mechanism of the first embodiment.

FIG. 5 is a plan view showing an operating state (No. 2) of the brake mechanism attached to the tape loading mechanism of the first embodiment.

FIG. 6 is an explanatory diagram showing an operation procedure of a brake mechanism at the time of unloading in the tape loading mechanism of the first embodiment.

FIG. 7 is a plan view showing an operating state (No. 1) of the brake mechanism attached to the tape loading mechanism of the second embodiment of the present invention.

FIG. 8 is a plan view showing an operating state (No. 2) of the brake mechanism attached to the tape loading mechanism of the second embodiment.

FIG. 9 is a plan view showing an operating state (part 3) of the brake mechanism attached to the tape loading mechanism of the second embodiment.

FIG. 10 is a plan view of a magnetic recording / reproducing apparatus including a conventional tape loading mechanism.

FIG. 11 is a perspective view of a tape pull-out means used in a conventional tape loading mechanism.

[Explanation of symbols]

 1 cassette 2 supply reel 3 take-up reel 4 tape 5 chassis 6 cylinder 7 supply reel stand 8 take-up reel stand 9,10 stopper pin 11,12 slide base 13-16 guide pin 17,18 concave part 19,20 tape pull-out post 21 Post shaft 22 Upper flange 23 Roller 24 Lower flange 25,26 Inclined post 27,28 Guide groove 31 Shaft portion 32 Flange portion 33 Compression spring 34 Gear 35 Friction member 36 Reel base shaft 41, 61 Cam 42, 62 Cam groove 43 Cam shaft 44, 63 Slider 45 Driven pin 46, 64 Long groove 47 Brake release pin 48 Slider guide pin 49 Brake lever 50 Brake shoe 51 Brake shaft 52, 66 Tension spring 53, 65 Spring hook pin

Claims (5)

[Claims] 1. A tape withdrawing means for withdrawing a tape from a cassette, and reciprocating the tape withdrawing means between a first position where the tape is accommodated in the cassette and a second position where the tape is wound around a cylinder. A driving means for moving the tape, and a first pulling means for braking the reel base on the side where the tape is rewound during unloading for moving the tape from the second position to the first position.
And a braking means of the tape loading mechanism. 2. A tape withdrawing means for withdrawing a tape from a cassette, and reciprocating the tape withdrawing means between a first position where the tape is stored in the cassette and a second position where the tape is wound around a cylinder. Drive means for moving the tape, and when the tape pulling means moves the tape from the first position to the second position, at the time of loading, a brake is applied to a reel base that supplies the tape, and the tape pulling means causes the tape pulling means to move A second brake means for applying a stronger brake to the reel stand on the side where the tape is rewound than the second position when the tape is rewound from the second position to the first position. mechanism. 3. The tape drawing means is a slide base slidably and reciprocally slid between the first and second positions of the tape by the driving means, and is vertically installed on the slide base. A tape pull-out post having an upper flange and a lower flange and a roller; and an inclined post standing upright on the slide base in the vicinity of the tape pull-out post and inclined substantially parallel to the tape sliding surface of the cylinder. The tape loading mechanism according to claim 1 or 2, wherein the tape loading mechanism is a thing. 4. The first brake means is rotatably mounted so as to come into contact with and separate from a part of a reel base for supplying the tape, and a friction torque is applied to the reel base by an urging force of an elastic member. A brake lever for giving the brake lever, and a slider for rotating the brake lever to a pressing position and a separating position with respect to the reel base, and at the time of loading and unloading the tape, 2. The tape loading mechanism according to claim 1, wherein the brake lever is rotated in a contacting direction. 5. The second brake means is rotatably attached so as to come into contact with and separate from a part of a reel base for supplying the tape, and a friction torque is applied to the reel base by an urging force of an elastic member. A brake lever for giving the brake lever, and a slider for rotating the brake lever between the pressing position and the separating position with respect to the reel base via the elastic member. On the other hand, the brake lever is brought into contact with a constant pressure, and at the time of unloading the tape, the brake lever is brought into contact with the reel base with a pressure stronger than that during loading. The tape loading mechanism described.