JPH09167464A - Reel for magnetic tape cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the productivity of reels usable with two kinds of constitutions while coping with the usage by individually forming a body of the reel constituted so as to be capable of integrating with a center cap and the center cap respectively. SOLUTION: In the magnetic cartridge 1 housing two reels 5, 7 in a single cartridge, the center cap 25 formed to be capable of abutting on a tip part 8 of a rotary shaft 2 for reel and the reel body 5B capable of integrating with the center cap 25 in a fitting hole 5C are individually formed. Consequently, the reel body 5B integrating the center cap 25 and the reel body 5, to which the center cap 25 is unequipped, become usable as the reels for different usage each other. Thus, the reel bodies 5A, 5 are formed by the same design, thence the productivity of the reels is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel for a magnetic tape cartridge, and more particularly to a reel for a magnetic tape cartridge suitable for use as an external memory of a large general-purpose computer.

[0002]

2. Description of the Related Art Generally, a magnetic tape is used as an external memory of a large-scale general-purpose computer. The magnetic tape has one end fixed to a reel shaft in a substantially square box-shaped casing. There is a cartridge that is loaded into a computer (hereinafter, referred to as hardware) as a cartridge that is wound around and stored.

When this cartridge is loaded into hardware, a block-shaped holding member that holds the other end of the magnetic tape is sandwiched by a mechanism provided on the hardware side, and the magnetic tape is pulled out from the casing to be hard. It is loaded along the magnetic tape transport path provided inside,
A recording head for recording information, a reproducing head for reading the recorded information, and the like are arranged in the transport path.
The other end of the magnetic tape is wound on a reel in the hard. This cartridge has a casing whose width is slightly larger than the diameter of the reel and is approximately square, and is relatively compact as a whole. However, the magnetic tape transport mechanism on the hardware side is complicated, and the reel on which the other end of the magnetic tape is wound is required. Therefore, the hardware configuration is complicated.

On the other hand, there is a magnetic tape cartridge in which two reels are housed in a cartridge. In this case, for example, like a VHS system video cassette, two reels have separate reel shafts with a predetermined interval in their radial direction. Such a structure in which two reels are rotatably provided has a feature that the hardware structure can be simplified because the magnetic tape can be brought into contact with the magnetic head without being pulled out from the cartridge. With the configuration in which three reels are arranged side by side,
The width of the casing is longer than that of the one-reel type magnetic tape cartridge, and the entire casing is large.

[0005]

Under such circumstances, two reels are arranged coaxially, and the width of the casing is slightly larger than the reel diameter. The magnetic tape has a compact shape like the cartridge described above. Cartridges are also conceivable. However, when adopting a configuration in which two reels are coaxially arranged, the structure of each reel is partially different, and therefore it is necessary to manufacture the two reels separately, which reduces the productivity of the reels. There are some challenges that need to be addressed.

It is an object of the present invention to provide a reel for a magnetic tape cartridge which can be used in at least two types of structures and which has improved productivity, depending on the intended use.

[0007]

The above object of the present invention is to provide a center cap formed so as to be capable of contacting the tip of a reel rotation shaft, and a fitting hole for fitting the center cap. This is achieved by a reel for a magnetic tape cartridge, characterized in that a reel body that can be integrated with the cap is formed separately.

In the reel for a magnetic tape cartridge according to the present invention, the reel body which can be integrated with the center cap formed so as to be capable of contacting the tip of the reel rotation shaft and the center cap are separate bodies. Therefore, the reel unit having the center cap integrated therein and the reel unit not equipped with the center cap can be used as reels having different purposes.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a reel for a magnetic tape cartridge according to the present invention will be described below with reference to the drawings. 1 is an overall view of the magnetic tape cartridge as viewed from the back surface side, the reel is shown in the direction of arrow II in FIG. 2, FIG. 2 is a perspective view of the reel, and FIG. 11 is a sectional view taken along line I-I in FIG. As can be seen from FIGS. 1, 2 and 3.
In this embodiment, a magnetic tape cartridge 1 and a reel rotation shaft 2 provided on the hardware (not shown) side
A reel drive system mainly composed of
The magnetic tape cartridge 1 has a box-shaped casing 3 made of synthetic resin or the like, and a first reel 5 and a second reel 7 made of synthetic resin or the like are coaxial with each other (see FIG. 3).
See)).

Reel shaft insertion holes 9, 9 communicating with each other are formed at the central axis positions of the first reel 5 and the second reel 7, and the reel rotation shaft 2 is inserted in the reel shaft insertion holes 9, 9. Is inserted. In this case, a circular opening 3A is formed in the casing 3 so that the reel shaft insertion hole 9 of the first reel 5 is exposed to the outside of the casing 3.

On the inner peripheral side surfaces of the reel shaft insertion holes 9, 9, a plurality of convex walls 1 are provided along the respective thickness directions.
3 are formed respectively, and the tip side claw portion 4 and the base side claw portion 6 of the reel rotation shaft 2 are fitted and inserted into the adjacent convex walls 13, 13 long grooves 13A. Is configured.

Further, as shown in the sectional view taken along the line I--I of FIG. 3, the portion forming the through holes 9, 9 serves as a core portion around which a magnetic tape (not shown) is wound up. 5A
The take-up shafts 5A and 5A are formed in a cylindrical shape, and are parallel to their outer peripheral side surfaces with a predetermined distance (somewhat larger than the width of the magnetic tape) from each other. A pair of disc-shaped flange portions 17 and 19 are provided on the upper and lower ends of the winding shafts 5A and 5A, respectively.

The second reel 7 is always placed in the reel shaft insertion hole 11 of the second reel 7 at the back of the first reel 5.
The center cap 2 is abutted against a spring material (not shown) provided in the casing 3 for biasing in the direction and the tip of the tip side 8 of the reel rotation shaft 2 is abutted.
5 is fixed with an adhesive or the like. In this case, the center cap 25 is formed separately from the reel body 5 of the second reel 7, and is fitted and fixed in the fitting hole 5C formed in the reel body 5B, whereby the reel body is It is integrated with 5B. That is, the reel body 5B of the second reel 7 and the first reel 5 are basically formed based on the same design, and the center cap 25 is integrated with the reel body 5B (first reel 5). , The second reel 7 is formed.

Further, in this embodiment, the first reel 5
At the peripheral position of the reel shaft insertion hole 9 formed in
A ring-shaped metal plate 27 is fixed by an adhesive or molding, and the magnet 12 for magnetically chucking the metal plate 27 and separating the first reel 5 from the second reel 7, It is provided on the base side 10 of the reel rotation shaft 2. Therefore, when the magnetic tape cartridge 1 is used, the attitude of the magnetic tape cartridge 1 is, for example, when the rotation axes of the first reel 5 and the second reel 7 are along the vertical direction or along the horizontal direction. In this case, it can be appropriately selected according to the hardware configuration.

When the rotation axes of the first reel 5 and the second reel 7 are along the vertical direction, the first reel 5
Due to gravity (self-weight), it falls toward the reel rotation shaft 2 and separates from the second reel 7. Therefore, a configuration without the metal plate 27 and the magnet 12 is also possible, and the magnetic tape cartridge 1 and the reel rotation shaft 2 are It is possible to simplify the configuration of the entire system including.

In the system configured as described above, as can be understood from FIG. 4, the reel rotating shaft 2
However, when the reel shaft is inserted into the reel shaft insertion holes 9 and 11, the tip end side 8 of the reel rotation shaft 2 moves toward the center cap 2.
5, the tip side claw portion 4 contacts the long groove 13 of the second reel 7.
The base side claw portion 6 is engaged with A and the base side claw portion 6 is provided with the long groove 13 of the first reel 5.
Engaged with A.

At this time, since the tip end side 8 of the reel rotation shaft 2 pushes the center cap 25 against the biasing force of the spring material, the first reel 5 and the second reel 7 are temporarily moved toward the spring material. The second reel 7 moves and is held in its moving position on the tip side 8 while the first reel 5 moves to the metal plate 2
Since the magnet 7 is pulled by the magnet 12, the magnet 7 is held at a position separated from the second reel 7, and the metal plate 27 and the magnet 12 are also separated from each other.

Therefore, in this state, the front end side 8 and the base side 10 of the reel rotation shaft 2 are rotationally driven at desired rotational directions and rotational speeds (rotational forces), whereby the first reel 5 and the second reel 7 are rotated. And can be rotated in the desired direction and speed of rotation. As a result, when the desired information is recorded on the magnetic tape, when the recorded information is reproduced, or when the magnetic tape is fast forwarded or rewound, the control on the hardware side is performed.

As described above, in this embodiment, the reel body 5B integrally formed with the center cap 25 formed so as to be able to contact the tip portion 8 of the reel rotation shaft 2 and the center cap 25. And are separately formed. Therefore, the reel body 5B in which the center cap 25 is integrated and the first reel 5 not equipped with the center cap 25 can be used as the first reel 5 and the second reel 7 having different uses (structures), respectively. Become. As a result, since the reel bodies 5B can be formed with the same design, it is possible to improve the productivity of the first reel 5 and the second reel 7 that can be used in two types of structures, depending on the application. In the reel according to the present invention, it is preferable that the winding shaft 5A and the lower flange 17 are integrally molded, and the material is a shock-resistant resin such as silicone-containing high compact polystyrene (HIPS), polycarbonate containing glass fiber, polycarbonate. ABS resin and the like are preferable. Further, it is preferable that the upper flange 19 is molded as a separate body and then fixed to the upper end of the winding shaft 5A by welding or the like. As the material, general-purpose polystyrene (GPP) is used.
S), acrylonitrile styrene copolymer (AS), polycarbonate and the like are preferable. Further, the center cap 25 is preferably a resin having good wear resistance, such as polyoxymethylene.

In this embodiment, the casing 3
The magnetic tape cartridge 1 in which the first reel 5 and the second reel 7 are arranged in a stacked manner has been described, but in the present invention, the two reels are arranged in the casing by the parallel rotating shafts. The present invention can be applied to reels of various configurations, such as those having a configuration or a configuration in which only one reel is arranged in the casing.

[0021]

As can be understood from the above description, in the reel for magnetic tape cartridge according to the present invention, it is configured so as to be integrated with the center cap formed so as to be capable of contacting the tip end portion of the reel rotation shaft. Since the reel body and the center cap are separately formed, the reel body with the integrated center cap and the reel body without the center cap can be used as reels for different purposes. Become. As a result, since the reel bodies are formed with the same design, it is possible to improve the productivity of reels that can be used in at least two types of structures, depending on the application.

[Brief description of the drawings]

FIG. 1 is an external view of a magnetic tape cartridge to which a magnetic tape cartridge reel according to the present invention is applied.

FIG. 2 is a perspective view showing a configuration of a first reel and a second reel.

FIG. 3 is a cross-sectional view taken along the line I-I in FIG. 1 and is an explanatory view showing the configuration of the magnetic tape cartridge and the configuration of the reel rotation shaft in the preferred embodiment.

FIG. 4 is an explanatory diagram showing a procedure of recording / reproducing in a system mainly composed of a magnetic tape cartridge and a reel rotation shaft.

[Explanation of symbols]

 1 Magnetic Tape Cartridge 2 Reel Rotating Shaft 3 Casing 3A Opening Hole 4 Tip Side Claw 5 First Reel 5A Winding Shaft 5B Reel Body 5C Fitting Hole 6 Base Side Claw 7 Second Reel 8 Tip Side 9 Reel Shaft Insertion Hole 10 Base Side 12 Magnet 13 Convex Wall 13A Long Groove 17, 19 Flange 25 Center Cap 27 Metal Plate

Claims (1)

[Claims] 1. A center cap formed so as to come into contact with the tip of a reel rotation shaft, and a reel body which is formed with a fitting hole into which the center cap is fitted and which can be integrated with the center cap are separate. A reel for a magnetic tape cartridge, which is formed on the body.