JPH0547149A - Tape hub - Google Patents

Abstract

PURPOSE:To prevent the deformation of a tape to be wound in a pressing condi tion. CONSTITUTION:The tip part of a tape T is fixed to a tape clamping section 13, a tape hub 10 winding the tape in the direction of a hub circumference surface is formed in an almost cylinderical shape so that it is provided with a slit 14a in a cylindrical longitudinal direction and a hub ring 14 having elasticity in a radial direction is mounted on the circumference surface of the hub, as well. The clamp-fixed tape T is led out to the circumfernece surface of the hub ring 14 from the slit 14a and wound on the peripheral surface of the hub ring 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape hub around which a tape-shaped recording medium is wound, such as a cassette tape hub and an open tape hub.

[0002]

2. Description of the Related Art For example, various cassette tapes and open tapes which are widely used for various purposes by adopting a magnetic recording system serve as recording media for recording video signals, audio signals or various data. The magnetic tape is usually wound around the peripheral surface of the tape hub after the leader tape portion, which is the end of the magnetic tape, is fixed by the tape clamp portion formed on the peripheral surface portion of the tape hub. There is.

For example, FIG. 7 shows an example of a tape hub around which a magnetic tape T is wound, where 1 is a tape hub and 2 is a tape hub.
A predetermined number of engaging pieces are provided on the inner peripheral surface of the tape hub, and the engaging operation of the engaging piece 2 with the reel shaft when the recording / reproducing apparatus is loaded allows the tape hub 1 to rotate.
Further, 3 is formed with a clamp portion 3 composed of a concave portion 3a recessed from the outer peripheral surface of the tape hub 1 and a clamp piece 3b fitted into the concave portion, and an end portion of the magnetic tape T introduced into the concave portion 3a is a concave portion. Clamp piece 3 fitted in 3a
It is crimped and fixed by b.

[0004]

However, when the magnetic tape T is wound around the tape hub 1 as described above, the winding pressure becomes strong, or the tape hub 1 expands due to a temperature change, to a certain extent. When a force is applied to the magnetic tape T wound with the winding pressure from the inner circumferential direction of the magnetic tape T, the magnetic tape T may be adversely affected.

That is, since the clamp portion 3 must be provided on the outer peripheral surface of the tape hub 1, the outer peripheral surface of the tape hub 1 to which the magnetic tape T (leader tape portion) contacts can be made into a perfect circle. However, slight irregularities and steps due to the clamp portion 3 occur. Therefore, due to the winding pressure of the magnetic tape T itself and the expansion of the tape hub 1, the uneven shape on the peripheral surface of the tape hub appears on the wound magnetic tape T as shown by 4 surrounded by a dotted line in the figure. I will be destroyed. If such a deformation of the magnetic tape T occurs, there is a problem that signal dropout occurs during reproduction.

Various techniques have been proposed for improving the clamp portion 3 in order to prevent the pushing-down deformation and minimizing the loss of the roundness of the outer peripheral surface of the tape hub due to the clamp portion 3. In any case, it is very difficult to improve the roundness of the outer peripheral surface of the tape hub to the extent that the sleeping-like deformation is completely eliminated, and the shape of the clamp part 3 becomes complicated, resulting in deterioration of manufacturing efficiency. This causes adverse effects such as high cost.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an end portion of a tape-shaped recording medium is fixed by a tape clamp portion formed on the peripheral surface of the hub, and the peripheral surface of the hub is fixed. In a tape hub on which a tape-shaped recording medium is wound, a hub ring which is formed in a substantially cylindrical shape having a slit in the longitudinal direction of the cylinder and which has elasticity in the radial direction is attached to the hub peripheral surface, and the tape clamp portion is attached. The tape-shaped recording medium fixed to is provided on the peripheral surface of the hub ring through the slit of the hub ring and is wound around the peripheral surface of the hub ring.

[0008]

[Function] The magnetic tape does not show the influence of the hub peripheral surface, which is caused by unevenness or steps due to the tape clamp portion when the hub ring is mounted on the hub peripheral surface, and the hub ring has elasticity in the radial direction. Thus, the force applied to the magnetic tape due to the winding pressure of the magnetic tape or the expansion of the tape hub can be relaxed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a perspective view showing a state where an end portion (leader tape portion) of a magnetic tape T is fixed to a clamp portion in a tape hub having a flange, and FIG. 2 is a state in which the magnetic tape T is wound. FIG.

Reference numeral 10 denotes a tape hub as a whole, and 11
Is a tape hub main body formed in a substantially cylindrical shape, and an inner peripheral surface of the tape hub main body engages with a reel shaft when the tape hub 1 is loaded into a recording / reproducing apparatus to rotate the tape hub 1. A predetermined number of 12 are provided. Further, on the outer peripheral side of the main body portion 11, a concave portion 13 which is recessed in a predetermined shape from the outer peripheral surface.
The clamp portion 13 is formed of a clamp piece 13b fitted in the recess 13a, and the end of the magnetic tape T introduced into the recess 3a is crimped and fixed by the clamp piece 3b fitted in the recess 3a. ..

Further, 14 is the clamp portion 13 as described above.
Is a rubber ring that is mounted so as to cover the outer peripheral surface of the tape hub main body portion 11 provided with a circular shape. The rubber ring 14 is a rectangular rubber plate as shown in FIG. 3 (a). 3 (b) is bent into a cylindrical shape to form a ring shape as shown in FIG. 3 (c), and one side S ₁ of the rectangular rubber plate is formed in the cylindrical tape hub body 11. The height is approximately the same as the height, and the other side S ₂ of the rectangular rubber plate is approximately the same as the circumferential length of the outer peripheral surface of the tape hub body 11.

Since a rectangular rubber plate is bent into a cylindrical shape and mounted on the tape hub main body 11, the rubber ring 14 has a slit 14 extending in the longitudinal direction of the cylinder on its peripheral surface.
a will be formed. And this slit 14
The magnetic tape T is mounted so that the position of a is substantially coincident with the portion where the magnetic tape T is led out from the clamp portion 13 to the outer peripheral surface of the main body portion 11.

An upper flange 15 and a lower flange 16 are provided on the upper surface and the lower surface of the cylindrical tape hub body 11, and the upper and lower flanges 15 and 16 prevent the magnetic tape T from being disturbed in the width direction. It

In such a tape hub 10, after the leader tape portion is fixed by the clamp portion 13, the magnetic tape T is led out to the outer peripheral surface of the rubber ring 14 through the slit 14a, and as shown in FIG. It will be wound around the outer peripheral surface of the ring 14.

Therefore, even if the clamp portion 13 causes unevenness or steps on the outer peripheral surface of the tape hub body 11,
The uneven surface is not in contact with the magnetic tape T (leader tape portion), and due to the elasticity of the rubber ring 14 itself, the effect of the uneven surface hardly appears on the outer peripheral surface of the rubber ring 14. Further, even if the winding pressure of the magnetic tape T becomes strong, or the main body 11 expands due to a temperature change or the like, the rubber ring 1
When 4 expands and contracts in the radial direction, the force applied to the magnetic tape T is significantly reduced.

Therefore, in the tape hub 10 of this embodiment, the wound magnetic tape T is prevented from being deformed in a sleeping state, and the reproduction signal from being dropped out is also eliminated. It is also possible to avoid deformation of the wound magnetic tape T due to sink marks or the like generated at the time of molding the main body portion 11, as well as the unevenness and the step formed by the clamp portion 13.

Further, in this embodiment, since the magnetic tape T is not affected by the unevenness or the level difference caused by the clamp portion 13, the structure of the clamp portion 13, the molding accuracy, the mounting accuracy, etc. are not so strictly considered. Therefore, there is also an advantage that the degree of freedom in designing the clamp portion 13 is significantly increased, and manufacturing efficiency is improved and cost reduction is promoted.

By the way, in the above embodiment, the hub ring wound around the outer peripheral surface of the tape hub body 11 is made of a rubber ring body, but it is also conceivable that the hub ring is made of metal.

FIG. 4 is a perspective view showing a state where the end portion (leader tape portion) of the magnetic tape T is fixed to the clamp portion in the tape hub with the lower flange, and FIG. 5 shows the magnetic tape T wound. It is a perspective view of the mounted state. In these figures, the same parts as those in FIG. 1 and FIG.

A metal ring 17 is shown in FIG. 4, and this metal ring 17 is a metal pipe of a predetermined size in which a slit is formed by cutting a metal pipe in the longitudinal direction of the cylinder. And this metal ring 17 is shown in FIG.
Is mounted on the peripheral surface of the tape hub main body 11,
The magnetic tape T is wound around the peripheral surface of the metal ring 17. The magnetic tape T, the leader tape portion of which is fixed by the clamp portion 13, is then led out to the outer peripheral surface of the metal ring 17 through the slit 17a.

The metal ring 17 is shown in FIG.
As shown in FIG. 6A, a rectangular metal plate is used as shown in FIG.
As shown in FIG. 6 (b), it is bent into a cylindrical shape to form a metal ring 17 having a slit 17a as shown in FIG. 6 (c). This metal ring 17 is similar to the rubber ring 14 in the outer circumference of the tape hub body 11. You may make it mount | wear so that a surface may be covered. In this case, one side S ₁ of the rectangular metal plate is substantially the same as the height of the cylindrical tape hub body 11,
The other side S ₂ of the rectangular metal plate is slightly longer than the circumferential length of the outer peripheral surface of the tape hub body 11.

The material of the metal ring 17 may be brass plated with chrome, SUS, aluminum plate, or the like.

However, when the metal ring 17 is attached to the tape hub body 11, the width of the slit 17a is made wider to some extent than that of the rubber ring 14, and the width of the slit 17a is narrowed. Thus, the metal ring 17 has elasticity in the radial direction, that is, in the direction in which the clearance with respect to the tape hub body 11 changes.

Further, even when the slit 17 is closed, the metal ring 17 and the tape hub body 11 are
There is some clearance between them. That is, the diameter of the inner peripheral surface of the metal ring 17 when the slit 17 is closed is set to be slightly larger than the diameter of the outer peripheral surface of the main body 11.

When the metal ring 17 is attached to the main body 11, since the metal ring 17 itself does not have elasticity, even if the clamp portion 13 causes unevenness or steps on the outer peripheral surface of the tape hub main body 11, The influence of the uneven surface does not appear on the outer peripheral surface of the metal ring 17. Of course, even when a sink mark is generated or the cylindricity is low during the molding of the main body portion 11, the rigidity of the metal ring 17 itself causes the shape abnormality of the main body portion 11 to appear on the outer peripheral surface of the metal ring 17. There is no such thing.

Further, when the winding pressure of the magnetic tape T becomes strong, the slit 17a allows the metal ring 17 to expand and contract in the radial direction, so that the force applied to the magnetic tape T itself is reduced, and When the main body 11 expands due to temperature change or the like, the metal ring 17
The force applied to the magnetic tape T can be canceled by the clearance between the inner peripheral surface of the magnetic tape and the outer peripheral surface of the main body 11.

Therefore, as in the case of the rubber ring 14, the shape of the outer peripheral surface of the main body 11, the tape winding pressure, or the main body 1
It is possible to prevent the magnetic tape T from being deformed in a sleeping state due to the expansion of the magnetic tape 1 and the like, and to eliminate the dropout of the reproduction signal.

Further, in the tape hub of the present invention,
As the hub ring to be mounted on the outer peripheral surface of the main body, various materials such as a rubber ring and a metal ring, a resin molded material such as ABS or POM, and a ceramic material can be considered. If the hub ring itself does not have elasticity due to the material used,
As in the case of the metal ring 17, the slits allow elasticity in the radial direction.

In the case of a material (for example, resin) that cannot be formed into a ring shape while being attached like metal or rubber, or is difficult to form, it is formed into a cylindrical shape in advance and the upper and lower parts of the main body 11 are There is no problem as it can be mounted from the direction. This mounting method does not cause any problem in a tape hub having no flanges (15, 16), and even in a tape hub having a flange (15, 16), a hub ring is mounted before mounting at least one flange. This is possible. Of course, such a forming method and attaching method may be adopted when forming the hub ring from metal or rubber.

That is, as the tape hub of the present invention,
The structure of the tape hub itself is not limited to the structure of the above embodiment, and the mounting method, molding method, size, etc. of the hub ring may be variously adjusted according to the actual structure of the tape hub.

The present invention can be widely adopted as a tape hub for various types of cassette tapes or open tapes. For example, open tapes and compact cassettes for analog audio recording, and D for digital audio recording.
Examples include AT cassettes, VHS cassettes for recording audio and video, beta cassettes, 8 mm video cassettes, and tape cassettes for data storage. Further, the magnetic tape is not limited to the one using a magnetic tape as a recording medium corresponding to the magnetic recording system, and may be used as a tape hub around which an optical tape is wound.

[0032]

As described above, in the tape hub of the present invention, the hub ring having the slit and having elasticity in the radial direction is mounted on the hub peripheral surface, and the tape-shaped recording medium fixed to the tape clamp portion is cut from the slit. Since the tape is led out to the peripheral surface of the hub ring and wound around the peripheral surface of the hub ring, the tape hub has an uneven surface or a step on the peripheral surface of the tape hub caused by the tape clamp, etc. It is possible to prevent the reproduction signal dropout.

Further, since the deformation of the sleeping shape is eliminated, it is not necessary to strictly maintain the accuracy in the design, molding and mounting of the tape clamp portion, and the design and manufacturing process can be greatly simplified. is there.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of a tape hub of the present invention.

FIG. 2 is a plan view of the present embodiment.

FIG. 3 is an explanatory diagram of a rubber ring.

FIG. 4 is a perspective view of another embodiment of the tape hub of the present invention.

FIG. 5 is a perspective view of another embodiment.

FIG. 6 is an explanatory diagram of another example of forming the metal ring.

FIG. 7 is an explanatory diagram of a tape-shaped tape deformation.

[Explanation of symbols]

 10 Tape Hub 11 Body 13 Clamp 14 Rubber Rings 14a, 17a Slit 17 Metal Ring

Claims (1)

[Claims] 1. A tape hub in which an end portion of a tape-shaped recording medium is fixed by a tape clamp portion formed on a peripheral surface of the hub, and the tape-shaped recording medium is wound on the peripheral surface of the hub. A hub ring having a substantially cylindrical shape and having elasticity in the radial direction is mounted on the peripheral surface of the hub, and the tape-shaped recording medium fixed to the tape clamp portion extends from the slit to the peripheral surface of the hub ring. A tape hub that is configured to be drawn out and wound around the peripheral surface of the hub ring.