JPH06139662A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To obtain a tape driving mechanism constituted not to bring edge parts of a magnetic tape into contact with a rotary magnetic head. CONSTITUTION:The magnetic recording and reproducing device is roughly composed of the tape driving mechanism, the rotary magnetic head and a loading mechanism for a data cartridge (not shown in the figure), etc. Tape guides 22 and 23 are provided on both sides of the rotary magnetic head, and when the magnetic tape 13 is passed by guide posts 22c and 23c of tape guides 22 and 23, its edge parts of upper and lower ends are brought into sliding contact with bends 22d and 23d of the guide parts 22c and 23c, and hence bent. Magnetic heads 19a-19h of the rotary magnetic head can be brought into sliding contact with the magnetic tape 13 without contacting the bent edge parts.

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, and more particularly to a magnetic recording / reproducing apparatus in which a rotating magnetic head slides on a running magnetic tape to perform magnetic recording / reproducing.

[0002]

2. Description of the Related Art For example, in a computer, an auxiliary recording device called a streamer is used for backing up a storage device. In this type of recording apparatus, a data cartridge having a pair of tape reels inside which a magnetic tape is wound and a drive roller provided in the center front surface for driving the pair of tape reels is mounted. The drive roller is rotated to run the tape and perform magnetic recording.

In this type of recording apparatus, for example, an idler that is pressed against a drive roller in the data cartridge is driven to rotate by a motor, and a servo signal is generated to generate a signal having a frequency proportional to the rotational speed of the motor. The motor rotation is controlled by the method. In order to increase the storage capacity, a new type magnetic recording / reproducing apparatus has been developed which uses a rotary head instead of a fixed head.

In a magnetic recording / reproducing apparatus having this rotary head, as shown in FIG. 14, eight magnetic heads 63 are provided at the end of a head holder 62 having a rotary shaft in a direction orthogonal to the running direction of the magnetic tape 61. At the time of magnetic recording / reproducing, the magnetic head 63 is slidably contacted with the traveling magnetic tape 61 from a direction perpendicular to the traveling magnetic tape 61, and magnetic recording / reproducing is performed while forming an arc-shaped recording track 64 on the magnetic material layer of the magnetic tape 61. ing.

[0005]

However, in the above magnetic recording / reproducing apparatus, the tape guide rollers 65 in the data cartridge (not shown) around which the magnetic tape 61 is wound are positioned on both sides of the head holder 62. However, the tape guide roller 65 merely guides the magnetic tape 61 so that the magnetic tape 61 travels in the tape traveling position in the vertical state. Therefore, when the diameter of the head holder 62 is larger than the tape width of the magnetic tape 61, the magnetic head 63 provided at the end of the head holder 62 is placed on the tape from a position separated from one edge of the magnetic tape 61. Of the magnetic tape 61, the magnetic material on the surface of the magnetic tape 61 slides in an arc shape to perform magnetic recording and reproduction, and the magnetic tape 61 is displaced so as to be separated from the other edge.

That is, the magnetic head 6 rotating as described above.
In the magnetic recording / reproducing apparatus having No. 3, the rotation direction of the magnetic head 63 does not coincide with the traveling direction of the magnetic tape 61, and the magnetic head 63 is provided at the end portion of the head holder 62 which rotates around an axis orthogonal to the traveling direction of the magnetic tape 61. Since the magnetic head 63 is slidably contacted across the width of the magnetic tape 61, the tip of the magnetic head 63 comes into contact with the edge of the magnetic tape 61 and the magnetic material of the magnetic tape 61 is peeled off.

Therefore, it is an object of the present invention to provide a magnetic recording / reproducing apparatus which solves the above problems.

[0008]

According to the present invention, in a magnetic recording / reproducing apparatus in which a magnetic head provided on a rotating body slides on a magnetic tape to perform magnetic recording / reproducing, an edge portion of the magnetic tape is separated from the rotating body. It is characterized in that a tape guide that bends in the direction of separation is provided near the tape sliding contact position of the magnetic head.

[0009]

By providing the tape guide that bends the edge of the magnetic tape in the direction away from the rotating body, the magnetic material of the tape is prevented from peeling off when the magnetic head slides on the magnetic tape.

[0010]

1 to 3 show an embodiment of a magnetic recording / reproducing apparatus according to the present invention.

In each figure, a magnetic recording / reproducing apparatus 1 is generally composed of a tape drive mechanism 2, a rotary magnetic head 3, a mounting mechanism (not shown) for a data cartridge 4, and the like. The tape drive mechanism 2 is the first for moving the tape at a high speed.
Drive mechanism 5, a second drive mechanism 6 for running the tape at a low speed, and a switching mechanism 7 for switching from the first drive mechanism 5 to the second drive mechanism 6. Therefore, in the magnetic recording / reproducing apparatus 1, when the data cartridge 4 is mounted, the tape is run at a low speed by the second drive mechanism 6, and the first drive mechanism 5 is driven.
Makes the tape run at high speed.

First, the data cartridge 4 mounted in the magnetic recording / reproducing apparatus 1 will be described.

As shown in FIG. 3, the data cartridge 4
Has guide grooves 8a and 8b on both sides of the box-shaped cassette 8 for guiding in the insertion direction, and lock grooves 8c and 8d for locking the guide grooves 8a and 8b at the lower front positions of the guide grooves 8a and 8b at the mounting position.
Is provided (however, the guide groove 8b and the lock groove 8d are hidden and invisible in FIG. 3). Further, a lid 10 that opens in association with the insertion operation is provided in the opening 9 on the front surface of the data cartridge 4.
And the top plate 8 of the cassette 8 is provided in the opening 11 adjacent to the opening 9.
and a drive roller 12 rotatably supported by e.

The lid 10 is closed when the data cartridge 4 is not attached to the magnetic recording / reproducing apparatus 1,
The inside of the cassette 8 and the magnetic tape 13 are protected by closing the opening 11 through which the rotary magnetic head 3 enters.
When the data cartridge 4 is attached to the magnetic recording / reproducing apparatus 1 as described later, the lid 10 rotates to open the opening 9 and expose the magnetic tape 13 as shown in FIG.

As shown in FIG. 5, the data cartridge 4
A pair of reels 14 and 15 around which a magnetic tape 13 is wound are rotatably supported inside the drive belt 18 and wound around a drive roller 12 on the front side and guide rollers 16 and 17 on the rear side. Is stretched. The drive belt 1
8 is a magnetic tape 1 wound around a pair of reels 14 and 15.
The rollers 12, 16, and 17 are guided so as to be pressed against the outer periphery of the roller 3, and the pair of reels 14 and 15 are rotationally driven in the tape winding direction while traveling by the rotational driving of the drive roller 12.

Returning to FIG. 1 again, the magnetic recording / reproducing apparatus 1
Will be described.

The rotary magnetic head 3 has a structure in which a cylindrical head holder 19 is rotationally driven by a motor 20.
As shown in FIG. 8, eight magnetic heads 19a to 19h are arranged on the outer periphery of the end portion of the head holder 19 at equal intervals of 45 degrees. The head holder 19 is provided so as to rotate about an axis O extending in the E and F directions orthogonal to the tape running direction. The outer diameter of the head holder 19 is larger than the tape width of the magnetic tape 13 wound inside the data cartridge 4.

As shown in FIG. 7, tape guides 22 and 23 are fixed in an upright state on the base 21 near the tape sliding contact inlet and the tape sliding contact outlet of the head holder 19. As shown in FIG. 8, the tape guides 22 and 23 are mounted on the base 21 and fixed by screws.
2a, 23a, supporting portions 22b, 23b standing upright in the vertical direction from the fixing portions 22a, 23a, and guide portions 22c, 23c projecting in the E direction so as to guide the magnetic tape 13 in the opening 9 of the data cartridge 4. And consists of.

The guide portion 22 of the tape guides 22 and 23
c and 23c are tape width guide grooves 22 of the magnetic tape 13.
E from the upper and lower ends of d and 23d and the guide grooves 22d and 23d
A pair of protrusions 22e and 23e projecting in the direction, and a direction in which the edge of the magnetic tape 13 is separated from the rotary magnetic head 3 at the corners of the pair of protrusions 22e and 23e and the guide grooves 22d and 23d. R-shaped curved portions 22f and 23 that are curved to
f is provided.

The tape guides 22 and 23 are a pair of tape guide rollers 5 provided inside the data cartridge 4.
Since the magnetic tape 13 is disposed closer to both sides of the rotary magnetic head 3 than the magnetic tape 3 is, when the magnetic tape 13 passes through the guide portions 22c and 23c, the edges of the upper and lower ends are the curved portions 2 as shown in FIG.
2f and 23f are slidably contacted and curved. Therefore, the magnetic heads 19a to 19h of the rotary magnetic head 3 can be slidably contacted with the magnetic tape 13 without contacting the curved edges, and the magnetic head 19a
The removal of the magnetic material of the magnetic tape 13 is prevented by a to 19h.

Next, the tape drive mechanism 2 will be described.

As shown in FIGS. 1 and 2, the first drive mechanism 5 of the tape drive mechanism 2 includes a first motor base 24 (shown by a broken line in FIG. 1) provided with a high speed motor 25. This high speed motor 25 is provided on the motor base 24,
The rotating shaft 25a has a bearing portion 24a of the motor base 24 and a bearing portion 2 of a motor cover 26 fixed to the motor base 24.
And 6a. The stator 25b of the high speed motor 25 is fixed to the motor cover 26, and the rotor 25c is provided integrally with the rotating shaft 25a.

A worm wheel 27 having a diameter substantially the same as the outer diameter of the motor cover 26 is fitted and fixed to the upper end of the rotary shaft 25a protruding to the upper surface of the motor cover 26. At the lower end of the shaft 25a,
A drive gear 28 having a small diameter is fitted and fixed.

Reference numeral 29 is an idler, on the outer periphery of which a rubber ring is fitted. The idler 29 is supported by a shaft 30 supported by the motor base 24, and a gear 31 (shown by a broken line in FIG. 1) is integrally provided below the idler 29. A toothed belt 32 is wound around the drive gear 28 and the gear 31. Therefore, the rotational driving force of the high speed motor 25 is transmitted to the idler 29 via the drive gear 28, the toothed belt 32, and the gear 31.

The motor base 24 is rotatably supported by a support shaft 33 embedded in the base 21.

Reference numeral 34 is a torsion spring, which is wound around a support shaft 33, one end of which is locked by a support shaft 34a which is planted in the base 20, and the other end of which is locked by a locking portion 24b of the motor base 24. There is. Therefore, the motor base 24 is biased in the A direction by the pressing force of the torsion spring 34. Therefore, before the data cartridge 4 is mounted, it is held at the position shown in FIG. 1, the data cartridge 4 is mounted, and the idler 29 is pressed by the drive roller 12 to rotate in the B direction.

Therefore, after mounting the data cartridge 4, the idler 29 is pressed against the drive roller 12 by the pressing force of the torsion spring 34. As a result, the drive roller 12 of the data cartridge 4 is rotationally driven, and the belt 1
By the traveling of 8, the tape reels 14 and 15 rotate.

The second drive mechanism 6 of the tape drive mechanism 2 is
The second motor base 35 is provided with a low speed motor 36. The worm 37 is attached to the rotary shaft 36a of the low speed motor 36.
And the tip 37a of the worm 37 is supported by a bearing portion 35a standing upright from the second motor base 35.

The second motor base 35 is the base 21.
It is rotatably supported by a support shaft 38 that is more upright, and rotates in the D direction in the high speed mode to separate the worm 37 from the worm wheel 27 provided above the high speed motor 25. Rotates in the C direction to engage the worm 37 with the worm wheel 27.

Next, the structure of the switching mechanism 7 will be described.

The switching mechanism 7 is configured to transmit the rotational driving force of the switching motor 39 via a gear unit 45 described later to drive the second motor base 35 in the C direction or the D direction. A worm 40 is provided on a rotation shaft 39a of the switching motor 39, and the rotative driving force of the worm 40 is a worm wheel 41 and a gear 42 integrated with the worm wheel 41 via a shaft 46, a rack 43 in which the gear 42 meshes, It is transmitted to the second motor base 35 via a lever 44 having a rack 43.

The lever 44 moves in the front-back direction (E and F directions).
It is provided so as to slide in, and a long hole 44a into which a pin 35a standing upright from the second motor base 35 is fitted is formed at the tip. Therefore, when the lever 44 slides in the front-rear direction (E, F directions), the pin 35a is driven in the C direction or the D direction while sliding in the elongated hole 44a, and the second motor base 35 performs the switching operation.

The front upper surface of the base 21 and the side walls 21a,
Guide rails 47 and 48 extending in the E and F directions are provided at the corners with 21b. This guide rail 47,
The reference numeral 48 also serves to guide the insertion of the data cartridge 4 and hold it at the mounting position.

The operation of the magnetic recording / reproducing apparatus 1 having the above structure will be described below.

First, in FIG. 1, when the data cartridge 4 is inserted from the front side of the base 21 in the F direction, the guide grooves 8a and 8b provided on both sides of the cassette 8 are inserted into the guide rails 47 and 48 of the base 21, respectively. Mating. The data cartridge 4 moves to the mounting position (not shown) while being guided by the guide rails 47 and 48, and the lock grooves 8c and 8d.
A lock member (not shown) is fitted and locked to the.

Further, in connection with the above-mentioned inserting operation of the data cartridge 4, the step portion 48a at the tip of the right guide rail 48 closes the opening 9 on the front surface of the data cartridge 4.
The end portion 10a (see FIG. 3). Therefore, while the data cartridge 4 is inserted in the F direction, the lid 10
Rotates in the opening direction as shown in FIG. Therefore, when the data cartridge 4 reaches the mounting position, the rotary magnetic head 3 and the guide portions 22c and 2c of the tape guides 22 and 23.
3c relatively enters the opening 9 of the data cartridge 4 and contacts the magnetic tape 13.

Therefore, at the same time when the data cartridge 4 is mounted, the magnetic tape 13 is guided by the guide portions 22c and 23c.
Are slidably fitted into the guide grooves 22d and 23d, and the upper and lower edges are curved by the curved portions 22f and 23f in a direction away from the rotary magnetic head 3.

At the same time, the idler 29 relatively enters the opening 11 of the data cartridge 4 and contacts the drive roller 12 rotatably supported by the top plate 8e of the cassette 8. Since the idler 29 is pressed in the F direction via the drive roller 12, the motor base 24 rotates in the B direction around the support shaft 33 against the pressing force of the torsion spring 34. Therefore, the data cartridge 4 is mounted, and the idler 29 is pressed against the drive roller 12 by the pressing force of the torsion spring 34.

When a high speed mode signal is input to the motor control circuit (not shown), the high speed mode is set, the high speed motor 25 is activated, and the rotary shaft 25a rotates at high speed.
The rotational driving force of the high speed motor 25 is the drive gear 2
8, idler 29 via toothed belt 32, gear 31
Be transmitted to. Further, the rotational driving force of the idler 29 is transmitted to the driving roller 12 of the data cartridge 4 and the belt 18 runs, whereby the tape reels 14 and 15 rotate at high speed. Therefore, the magnetic tape 13 wound around the tape reels 14 and 15 attaches the rotary magnetic head 3 at high speed, and the tape running in the high speed mode is performed.

Next, when the low speed mode signal is input to the motor control circuit (not shown), the low speed mode is set and the switching motor 39 of the switching mechanism 7 is started. The rotational driving force of the switching motor 39 is transmitted to the lever 44 via the gear unit 45, and the lever 44 slides in the E direction as shown in FIGS.

Therefore, the second motor base 35 rotates in the C direction, and the worm 37 meshes with the worm wheel 27. Then, the low speed motor 36 is started, and the worm 30 rotates at a low speed. Therefore, the rotational driving force of the low speed motor 36 is transmitted to the rotary shaft 25 a of the high speed motor 25 via the worm 37 and the worm wheel 27.

Further, the rotation of the rotary shaft 25a is the same as in the high speed mode, such as the drive gear 28, the toothed belt 32, and the gear 3.
1 is transmitted to the idler 29. Further, the rotational driving force of the idler 29 is transmitted to the driving roller 12 of the data cartridge 4 and the belt 18 runs, whereby the tape reels 14 and 15 rotate at a low speed. Therefore, the magnetic tape 13 wound around the tape reels 14 and 15 attaches the rotary magnetic head 3 at a low speed, and the low speed running in the low speed mode is performed.

When the switching motor 39 of the switching mechanism 7 is not driven, the engagement of the worm 40 and the worm wheel 41 locks the second motor base 35 at that position.

Since the high speed motor 25 is not energized in the low speed mode, the rotation shaft 25a of the high speed motor 25 is
Is a no-load state and is driven only by the rotational driving force of the low speed motor 36.

When a high speed mode signal is input to the motor control circuit (not shown), the switching motor 39 of the switching mechanism 7 is switched.
Is reversed and the lever 44 slides in the F direction. Therefore, the second motor base 35 rotates in the D direction as shown in FIGS. 1 and 2, and the worm 37 moves the worm wheel 27.
Be farther apart.

Thereafter, the high speed motor 25 is started and the rotary shaft 25a rotates at a high speed to enter the high speed mode. In this way, the tape reels 14 and 15 in the data cartridge 4 are moved to the high speed motor 25 by the switching operation of the switching mechanism 7.
Alternatively, since it is selectively rotationally driven by the low-speed motor 36, it is not necessary to perform low-speed and high-speed rotation control by one motor, and it is required for a disk or a magnetic material having a slit for detecting rotation, a detector, or the like. It is not necessary to increase the number of servo signals to be generated, and it is possible to increase the speed ratio of lower speed and higher speed.

Therefore, in the present embodiment, the speed ratio between the low speed mode and the high speed mode can be freely set by the performance of the high speed motor 25 or the low speed motor 36 irrespective of the detection accuracy of the rotation detector. For example, the speed ratio between the low speed mode and the high speed mode can be set to about 1: 2000, and the running speed of the magnetic tape 13 in the high speed mode can be controlled with high accuracy from low speed to high speed.

As the magnetic tape 13 travels as described above, the motor 20 is rotationally driven, and the head holder 19 having the eight magnetic heads 19a to 19h rotates.
As a result, magnetic recording / reproduction is performed while the magnetic heads 19a to 19h slidably contact the magnetic tape 13 in an arc shape.

As described above, since the tape guides 22 and 23 are arranged on both sides of the rotary magnetic head 3, when the magnetic tape 13 passes through the guide portions 22c and 23c, the edges of the upper and lower ends are shown in FIG. As shown in FIG.
Slide f together. Therefore, the magnetic tape 13 is attached to the guide portion 2
When passing through 2c and 23c, the edges of the upper and lower ends are slidably contacted with the curved portions 22f and 23f to be curved as shown in FIG.
Therefore, the magnetic heads 19a to 19h of the rotary magnetic head 3 are
Can be slidably contacted with the magnetic tape 13 without coming into contact with the curved edge, and the magnetic heads 19a to 19h prevent the magnetic material of the magnetic tape 13 from peeling off.

12 and 13 show modifications of the present invention.

In both figures, guide poles 51 for guiding the running position of the magnetic tape 13 are provided on both sides of the rotary magnetic head 3.
52 stands rotatably. This guide pole 5
Reference numerals 1 and 52 denote upper flange portions 51a and 52a slidingly contacting the upper edge portion of the magnetic tape 13, lower collar portions 51b and 52b slidingly contacting the lower edge portion of the magnetic tape 13, and tapes having the tape width of the magnetic tape 13. The sliding contact portions 51c and 52c are provided, and the R-shaped curved portion 51 is provided at the corners of the tape sliding contact portions 51c and 52c, the upper flange portions 51a and 52a, and the lower flange portions 51b and 52b.
d and 52d are provided.

Therefore, while the magnetic tape 13 passes through the guide poles 51, 52 standing up at the tape sliding contact inlet and the tape sliding contact outlet of the rotary magnetic head 3, the upper and lower edges are curved by the curved portions 51d, 52d. It curves in the direction away from 3. Therefore, the magnetic heads 19a to 19h of the rotary magnetic head 3 can slide on the magnetic tape 13 without coming into contact with the curved edges, and the magnetic heads 19a to 19h prevent the magnetic material of the magnetic tape 13 from peeling off. .

In the above embodiment, the magnetic recording / reproducing device as an auxiliary recording device used for computer backup is given as an example, but the present invention is not limited to this, and a magnetic recording / reproducing device having another rotary head may be used. Needless to say, it can be applied.

Further, although the curved portion is formed in the R shape in the above-mentioned embodiment, the invention is not limited to this, and the curved portion may be formed by an inclined surface or a tapered surface, for example.

In the above embodiment, eight magnetic heads 1 are used.
Although the head holder 19 having 9a to 19h is given as an example, the present invention is not limited to this, and the number of magnetic heads is, for example, 2 or 4.
Of course, it is also possible to provide an even number other than eight, six or ten or eight.

[0056]

As described above, since the magnetic recording / reproducing apparatus according to the present invention is provided with the tape guide for bending the edge portion of the magnetic tape in the direction away from the rotating body, the tape is used when the magnetic head slides on the magnetic tape. It has a feature that it can prevent the magnetic material of the magnetic tape from coming off without coming into contact with the edge of the magnetic tape.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of a recording / reproducing apparatus according to the present invention.

FIG. 2 is a vertical sectional view of a first drive mechanism.

FIG. 3 is a perspective view of a data cartridge.

FIG. 4 is a perspective view showing a state in which a lid of the data cartridge is opened.

FIG. 5 is a plan view and a front view of a data cartridge.

FIG. 6 is a diagram showing a rotary magnetic head and a tape guide.

FIG. 7 is a perspective view showing a rotary magnetic head and a tape guide.

FIG. 8 is a perspective view showing a tape guide.

FIG. 9 is a side view showing a rotary magnetic head and a tape guide.

FIG. 10 is a plan view for explaining the switching operation of the tape drive mechanism.

FIG. 11 is a vertical cross-sectional view of the first drive mechanism for explaining the switching operation of the tape drive mechanism.

FIG. 12 is a perspective view of a modified example of the present invention.

FIG. 13 is a side view of a guide pole according to a modified example of the present invention.

FIG. 14 is a perspective view for explaining a conventional configuration.

[Explanation of symbols]

 1 magnetic recording / reproducing apparatus 2 tape drive mechanism 3 rotary magnetic head 4 data cartridge 5 first drive mechanism 6 second drive mechanism 7 switching mechanism 12 drive roller 13 magnetic tape 14, 15 reel 19 head holder 19a-19h magnetic head 22 , 23 Tape guides 22d, 23d Curved parts 51, 52 Guide poles 51d, 52d Curved parts

Claims (1)

[Claims] 1. A magnetic recording / reproducing apparatus for performing magnetic recording / reproduction by a magnetic head provided on a rotating body slidingly contacting a magnetic tape, wherein a tape guide for bending an edge portion of the magnetic tape in a direction away from the rotating body. A magnetic recording / reproducing apparatus, characterized in that the magnetic recording / reproducing apparatus is provided in the vicinity of the tape sliding position of the magnetic head.