JP2585401B2 - Tape loading mechanism of magnetic recording / reproducing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus, and more particularly to a tape loading mechanism suitable for downsizing a mechanism.

[Conventional technology]

Generally, in a tape loading mechanism of a magnetic recording / reproducing apparatus in which a magnetic tape is pulled out of a cassette and wound around a rotating drum having a built-in rotary head at a predetermined angle, the tape is drawn out to form a predetermined tape path in order to simplify the mechanism. Pull-out member (tape guide)
Is mounted on a rotary ring disposed around a rotary drum, and the rotary ring is rotationally driven to move the tape pull-out member to a predetermined position. Here, in a system using a cassette in which a dead space occurs on the upper surface of the cassette due to the opening of the front lid, such as an 8 mm video cassette, the height of the rotation center of the rotating drum is reduced to reduce the thickness of the device. In order to make effective use of the dead space, the height is set considerably higher than the tape height of the cassette reel. For this reason,
On the cylinder entrance side, in order to load the tape at the above-mentioned height position, it is necessary to make the tape span as long as possible from when the tape leaves the cassette to when it enters the rotary drum. Along with that, the number of tape guides has increased,
They will be separated from each other. In loading using the rotating ring, during loading, at least one of the tape pull-out members is largely displaced radially outward from above the rotating ring to secure a desired position, and the tape pull-out is performed by the positioning member. A mechanism for holding the member is employed. In the unloading state, the tape pull-out member is put together as small as possible,
In order to accommodate the tape in the cassette opening, a mechanism that can change the interval between the tape pull-out members is also required.

Conventionally, as this type of apparatus, there is one described in, for example, JP-A-57-133558. In this conventional example, as a means for changing the interval between the tape pull-out members on the rotary ring, the tape pull-out member is supported on the rotary ring via a crimping mechanism having a coil spring having a large displacement amount, and the pull-out member is When the rotating ring is further rotated from a state in which it comes into contact with the predetermined positioning member, the interval between the tape pull-out members is changed, and a predetermined pressing force is obtained by the urging force of the spring.

[Problems to be solved by the invention]

In the above prior art, since the pressure bonding mechanism of the tape pull-out member moves integrally with the rotating ring, it is necessary to secure a moving space in the thickness direction or the radial direction of the rotating ring. In addition, when the loading is completed, the pressure reaction force of the tape pull-out member is concentrated and the rotation load of the rotating ring is caused. Therefore, there is a problem that the loading motor becomes large, which hinders the reduction in size and weight of the apparatus.

Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art, and to reliably move a tape pull-out member, which changes its relative position on a rotating ring or another transfer member, to a predetermined position.
Further, it is an object of the present invention to provide a tape loading mechanism of a magnetic recording / reproducing apparatus which can prevent a rotational load due to pressure bonding from being concentrated and can reduce the size and weight of the apparatus.

[Means for solving the problem]

In order to achieve the above object, in the present invention, a guide base having a tape guide erected on one end of an arm having a rotating shaft is provided on a guide base transfer member (rotary ring in the present embodiment). The position of the guide base can be changed by pressing the guide base, and the guide base pressing mechanism is arranged near the guide positioning member (catcher), so that the timing of pressing the guide base and the pressing pressure can be optimized. The configuration was adopted. Further, the distance between the guide bases can be changed by making the support portion of the arm connecting the guide base transfer member and the guide base long.

[Action]

In the present invention, with the operation of the guide base transfer member, the guide base connected to the transfer member (the ring gear in this embodiment) via the arm moves along a predetermined path,
When the guide base reaches a predetermined position, the relative position with respect to the drive member changes. When the operation of the drive member further proceeds and the guide base reaches a predetermined positioning member, the guide base is securely positioned with a predetermined pressing force by a pressing mechanism dedicated to the guide base disposed near the positioning member. You. At this time, the crimping time of the other guide base may be shifted from the crimping time of the guide, so that the crimping load does not concentrate at a single point. Further, when the operation of the transfer member progresses, the relative position between the transfer member and the guide base is configured to be changeable by a long hole provided in a connection portion of the connection arm with the transfer member, so that loading is performed. At the point of completion, a tape running pass with the guides largely separated is possible.

〔Example〕

Hereinafter, the configuration and operation of an embodiment of the present invention will be described in detail with reference to FIGS.

FIG. 1 is a schematic plan view of a magnetic recording / reproducing apparatus equipped with the tape loading mechanism of the present invention in an unloaded state. FIG. 2 shows a completed state of the magnetic recording / reproducing apparatus shown in FIG. The outline of the whole apparatus will be described with reference to FIGS.

The magnetic tape 1 is supplied from the supply reel 3 in the two-dot chain line of the cassette 2 to the tension pin 4, the inclined pin 6 erected on the guide base 5, the entry side second guide roller 7, and the guide base 8 also erected. The magnetic tape 1 is wound around the rotating drum 10 at a predetermined angle (226 °) through the implanted first guide roller 9 on the entry side, and then exits the rotating drum 10.
The cabstan passes through the retreat-side inclined pin 12 erected on the guide base 11, the retreat-side first height regulating guide 13, the pinch roller 14, and the retreat-side second height regulating guide 15,
While being driven at a constant speed by 16 and the pinch roller 14,
It is wound on a take-up reel 17 in the cassette 2. During this time, signals are recorded and reproduced on and from the magnetic tape 1 by a rotating head (not shown) attached to the rotating drum 10 so as to face 180 °.

In the apparatus of the present embodiment, the entry-side guide bases 5 and 8 are movably supported on an entry-side loading ring 18 (a) provided on the outer periphery of the rotary drum 10. Is the entry side loading ring 18 (a)
And a connection arm 19. Here, the connection arm 19 is rotatably supported by a pin 20 erected on the entry side loading ring 18 (a), and since this connection portion is an elongated hole, the connection arm 19 is A guide base 5 pivotally supported at the other end;
The connection distance with (a) can be changed. Further, the entry side loading ring 18 (a) is guided by pins 22 (a) and 22 (b) erected on the chassis 21 and is coaxially provided by a loading motor 23 with a gear 2 provided on the chassis 21.
4. The worm gear 25 is rotationally driven via a mode gear 26 supported on the chassis 21 and a speed increasing gear train 27. At this time, the guide base 8 is guided to a guide rail 28 provided on the outer periphery of the rotary drum 10 and is transferred to a predetermined position. On the other hand, the guide base 5 is transported to a predetermined position along a guide groove 29 provided on a guide plate (not shown) provided also on the outer periphery of the rotary drum 10. The guide base 10 is located on the exit loading ring.
A guide groove of a guide plate provided on the outer periphery of the rotary drum 10 is rotatably supported via a connecting arm 30 at 18 (b).
It is transferred to a predetermined position along 31.

Thus, a tape running path as shown in FIG. 2 is formed from the state of FIG.

Next, referring to FIG. 3, FIG. 4 and FIG.
The loading operation of the ten approach-side guide bases 5, 8 will be described in detail.

FIG. 3 is an enlarged plan view of the entry side tape loading mechanism in an unloaded state, FIG. 4 is an enlarged plan view of FIG. 3 in a completed loading state, and FIG. 5 is a side view of the guide base 5 in FIG. It is shown.

First, from the state shown in FIG. 3, the tension pin 4 is rotated in the direction of the arrow (A) by a cam (not shown), and then the entry-side loading ring 18 (a) is moved by the drive system as described above. Start rotation in the direction (B). Then, with the rotation of the entry-side loading ring 18 (a), the guide bases 5, 8 start moving. At this time, since the pin 20 is located at the end of the elongated hole provided in the connecting arm 19,
The guide base 5 starts to move for the first time when the pin 20 comes into contact with the front end of the elongated hole (the connection side of the guide base 5). Here, 32 is a positioning member of the guide base 5 and is fixed at a predetermined position on the chassis 21. Also, 33
Is a crimping arm that is pivotally supported on a pin 34 set in the positioning member 32 about the rotation center, and is urged by a torsion spring 35 with a predetermined force in the direction of arrow (C) and provided on the positioning member 32. The position is regulated by the stopper 36. Also,
Reference numeral 37 denotes a height regulating guide pivotally supported on the positioning member 32.

When the rotation of the entry side loading ring 18 (a) further advances, as described above, the guide bases 5, 8 move along the predetermined movement path to the position shown in FIG. As shown, the guide base 5 is spaced farther than the rotary drum 10 and is positioned by the positioning member 32 as shown in FIG. At this time, an optimal crimping force is applied to the guide base 5 by the crimping arm 33 as shown in FIG. As a result, the position of the positioning portion 7 (a) of the entry-side second guide roller 7 is regulated by the V-groove portion 32 (a) of the positioning member 32, and the height is regulated by the height regulating surface 32 (b) of the positioning member 32. Be regulated. Further, the pins set on the guide base 5
The rotation of the entry-side second guide roller 7 about the central axis is regulated by the contact of the 34 with the wall surface of the guide groove 32 (c) of the positioning member 32, so that the positioning is assured.

On the other hand, as shown in FIG. 4, the guide base 8 further rotates the entry side loading ring 18 (a) from the time when the positioning of the guide base 5 is completed (the state of the entry side loading ring ▲ ▼). It is positioned at a predetermined position via a crimping mechanism (not shown) of the base 8. At this time, the connecting arm 19 is in the state indicated by the broken line ▲.
▼ The guide base 5 only changes to the solid line state.
Has no effect on the positioning of the device.

Next, the positioning of the guide base 5 will be described in more detail with reference to FIG.

FIG. 6 is a plan view showing a process of positioning the guide base 5. FIG. 6A shows the approach-side second guide roller 7.
The positioning portion 7 (a) of the positioning member 32 is
(A), and when the entry-side loading ring 18 (a) further rotates in the direction of the arrow (B) from this state, the guide base 5 moves the positioning portion 7 (a) about the rotation center of the arrow (C). ), And at this time, the end of the guide base 5 rotates the crimp arm 33 in the direction of the arrow (D) against the urging force of the crimp arm 33. FIG. 6B shows a state in which the rotation of the guide base 5 is completed and the guide base 5 is positioned by the urging force of the crimping arm 33. When the entry side loading ring 18 (a) further rotates in the direction of the arrow (B), the connection arm 19 rotates about the connection pin 34 with the guide base 5 as shown in FIG. 6 (c). . At this time, the connecting portion of the connecting arm 19 with the pin 20 is formed by a long hole of a predetermined length, and the connecting with the connecting arm 19 does not separate even if the pin 20 moves in the direction away from the guide base 5. . Further, the positioning state of the guide base 5 is not affected, and the positioning state is reliably maintained.

FIG. 7 is a relationship diagram showing a load state of the loading motor 23 in a loading process. In the figure, a chain line 38 indicates a load characteristic when the conventional mechanism is used, and a solid line 39 indicates a load characteristic when the mechanism of the present invention is used. In the conventional mechanism, the crimping load W of the guide base 5 is applied to the loading motor 23 when the loading is completed. However, in the mechanism of the present invention, the crimping timing of the guide base 5 and the guide bases 8 and 10 can be shifted. Loading motor at the completion of loading
The load of 23 can be reduced, and the size of the motor can be reduced.

As described above, according to the present embodiment, the guide base 5 which is largely separated from the loading ring 18 (a).
And the guide base 5 is provided on the guide base positioning member 32, so that the connection between the loading ring 18 (a) and the guide base 5 is simplified, and the pressure Since no moving space for the mechanism is required, the size and thickness of the machine can be reduced.
Furthermore, since the pressing time of the guide base 5 can be shifted from the pressing time of the other guide bases 8 and 10, the maximum load in the loading process can be reduced. In addition, since the connecting portion of the connecting arm 19 with the loading ring 18 (a) is formed as an elongated hole, the interval between the guide rollers 7, 9 in the loading completed state and the unloading state can be changed. The degree of freedom in guide arrangement and guide configuration is expanded.

Now, the present embodiment is an example in which a rotating ring arranged on the outer periphery of the rotating drum is used as a guide transferring means.
Of course, the same effect can be obtained by applying the mechanism of the present invention to a means other than the rotating ring, for example, a transfer means using a link or a slider.

〔The invention's effect〕

According to the present invention, when a tape span length is required to correct a tape height deviation between a cassette and a drum on a tape entrance side or a tape exit side of a drum,
Since the guide base, whose relative position with respect to other guides changes, can be reliably positioned at a predetermined position on the guide transfer member, the tape running can be stabilized. Furthermore, since the pressing time of the displaced guide base can be shifted from the pressing time of the other guide bases, and the pressing force is not always applied to the guide base transferring means, the guide base transferring motor (loading motor) can be used. It can be miniaturized. Further, since the displaceable pressing mechanism of the guide base does not move with the guide base, the apparatus can be made compact and thin.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing an unloading state of a magnetic recording / reproducing apparatus on which a tape loading mechanism according to an embodiment of the present invention is mounted, FIG. 2 is a schematic plan view showing a loading completed state of FIG. FIG. 3 is an enlarged plan view showing an unloaded state of the tape loading mechanism on the drum entry side, FIG. 4 is an enlarged plan view showing a completed loading state of FIG. 3, and FIG. 5 is a guide base in a completed loading state. FIG. 6 is a plan view showing a positioning process of the guide base 5, and FIG. 7 is a relationship diagram showing a loading motor loading state in the loading process. DESCRIPTION OF SYMBOLS 1 ... Magnetic tape, 5 ... Guide base, 6 ... Inclined pin, 7 ... Second entrance guide roller, 10 ... Rotary drum, 18 (a) ... Entry side loading ring, 19 ... Connection arm , 23 ... Loading motor, 32 ... Positioning member, 33 ... Crimping arm, 35 ... Torsion spring.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Ikuo Nishida 1410 Inada, Katsuta, Ibaraki Prefecture Inside Tokai Plant, Hitachi, Ltd. In the Tokai Factory (72) Inventor Tetsuo Ito 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Within Hitachi Video Engineering Co., Ltd. (56) References JP-A-63-56853 (JP, A) JP-A-59-87648 ( JP, A)

Claims (2)

(57) [Claims] 1. A drum (10) on which a rotary head is mounted, a first tape pull-out member (8) for pulling out a recording tape (1) from a cassette (2) and winding it around the drum (10) at a predetermined angle; Second tape pull-out member (11)
A third tape pull-out member (5) displaced further outward of the drum than the first and second tape pull-out members, and a first tape pull-out member (8); A first transfer member (18a) for transferring the third tape pull-out member (5) to a predetermined position; and a second transfer member for transferring the second tape pull-out member (11) to a predetermined position. (18b) path changing means (29) for changing the path of the third tape pull-out member toward the outside of the drum as the transfer member moves in the loading direction; and A tape loading mechanism for a magnetic recording and reproducing apparatus having a positioning member for holding members at different positions, wherein the third tape pull-out member (5) is rotatable on one side. And the first transfer member (18)
a) a connecting member (19), which is connected to a pin (20) provided on the upper part so as to be able to freely fit and displace the third tape pull-out member (5) toward the outside of the drum; A pressure bonding member (33) for pressing and positioning the third tape pull-out member on the positioning member, and the first transfer member remains in contact with the first tape pull-out member even after the third tape pull-out member is pressed; A tape loading mechanism for a magnetic recording / reproducing apparatus, wherein the tape loading mechanism can be moved together with the tape pull-out member (8). 2. The positioning member (32) has a surface for determining the position of the tape pull-out member and a surface for determining the posture, and the pressing member (33) is installed on the surface for determining the posture. Item 2. A tape loading mechanism for a magnetic recording / reproducing apparatus according to Item 1.