JPH0831140A - Tape reel - Google Patents

Abstract

PURPOSE:To prevent the damage of upper and lower edges of a magnetic tape wound around a tape reel. CONSTITUTION:In a pair of adapter semi-bodies 1, 1, concentric outer peripheral part 2, middle peripheral part 4 and inner peripheral part 3 are provided with the same hights, and also each peripheral part is connected in the spaces by radially arranged plural ribs 5, 6, then the ribs 5 for connecting at least the outer peripheral part 2 and middle peripheral part 4 among the plural ribs are arranged in the nearly intermediate part of the hights of the outer peripheral part 2 and middle peripheral part 4, and also they are provided with opening ends separated by the prescribed distance from the edge parts of the outer peripheral part 2 and middle peripheral part 4.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to audio and video tape reels.

[0002]

2. Description of the Related Art Generally, a magnetic tape in a video tape cassette is a pair of magnetic tape reels.
It is wrapped around and stored in a cassette. The basic structure of this tape reel is a cylindrical inner peripheral portion that is connected to the rotary reel stand of the device, and a cylindrical inner peripheral portion that forms a tape winding surface that is connected to the inner peripheral portion through a plurality of radial ribs. A tape winding barrel portion called a hub is integrally formed of resin from the outer peripheral portion, and a pair of flanges are attached to the upper and lower ends of the tape winding barrel portion to prevent the magnetic tape from collapsing. Usually, the lower flange and the winding drum are integrally formed from the viewpoint of production efficiency, and the upper flange is welded to this to form a tape reel.

Ribs provided in the radial direction of the reel are provided for reinforcement to improve the mechanical strength of the tape winding surface and to improve the flow of resin when the reel is molded with molten plastic resin. There is. In addition, a U-shaped concave portion is formed on the winding surface, and a leader / trailer tape is inserted thereinto and a clamp having the same curvature as the tape winding surface is fitted to fix the tape end. There is. When the tape is stored in a state that it is wound around the reel starting from this connection portion, a large load acts on the center of the reel due to the winding pressure of the tape. In order to withstand this load, stress acts on the tape winding surface and the tape inner peripheral portion. Therefore, the mechanical strength, surface property, cylindricity, and roundness of the tape winding surface are closely related to the tape damage.

That is, the tape winding surface is tightened by the winding pressure at the inner peripheral portion of the tape, but when the tape winding surface is not distorted at all by the stress at the time of tightening, the tape is apparently extended. Stress acts. If this elongation is not uniform, the tape will have a wakame shape. Also, the surface properties,
Even if the cylindricity and the roundness are not good, it causes unevenness in the elongation of the tape, which also causes tape damage.

In particular, the upper and lower ends of the tape are weak in strength and are easily damaged. In a magnetic recording apparatus such as a video device, an audio signal and an important control signal for recording and reproducing are recorded near the upper and lower ends of the tape. Therefore, it is a very important factor in the performance of the tape.

[0006]

Various proposals have been made to avoid the above-mentioned tape damage. For example, in Japanese Utility Model Publication No. 2-37192, for example, a middle cylinder portion is provided between the tape winding surface and the inner cylinder, and a circularity is improved by connecting the middle cylinder portion and the winding surface with a rib. Reduces tape deformation during storage. However, in such a shape, the winding surface on the lower side of the tape is connected to the lower flange to maintain the structural strength, but since the winding surface cannot shrink much with respect to the shrinkage of the tape, Stress acts on the tape in the stretching direction, and the lower edge of the tape becomes wakame-shaped.

Therefore, for example, in Japanese Utility Model Publication No. 63-36551, the winding surface and the inner cylindrical portion are formed as separate parts,
The tape upper and lower edge portions can shrink the tape winding surface itself in response to the tape shrinkage. However, since the disk-shaped horizontal ribs are concentrically provided in the vicinity of the central portion of the tape, the strength against the shrinkage of the tape is not preferable because the stress is concentrated on the tape side with respect to the shrinkage near the center.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a pair of semicircular arcs is divided into a small diameter hub portion of a tape reel for winding a magnetic tape for a long time. In a tape reel that constitutes a large-diameter hub portion corresponding to a short-time tape reel by combining and fitting the above adapters, the pair of adapters have the same height and concentric outer peripheral portion and middle peripheral portion. And a plurality of radial ribs are provided between each of the peripheral portions as well as the inner peripheral portion,
The rib connecting at least the outer peripheral portion and the middle peripheral portion of the plurality of radial ribs is arranged at a substantially middle portion between the heights of the outer peripheral portion and the middle peripheral portion, and the outer peripheral portion and the middle peripheral portion. The present invention provides a tape reel characterized in that the tape reel has an open end that is separated from an edge of the portion by a predetermined distance.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the tape reel according to the present invention will be described in detail below with reference to FIGS.

FIG. 1 is a plan view of an adapter half of a tape reel according to the present invention. 2A and 2B are a plan view and a sectional view of a tape reel in which the adapter half body of FIG. 1 is assembled.

The tape reel of the present invention has a normal long time (1
The tape reel used in the tape cassette for 60 minutes is configured to be used as a tape reel for a short time (for example, 60 minutes) by changing the hub of the reel so as to have a large diameter. , A pair of adapter halves that fit into the reel hub.

That is, as shown in FIG. 1, the adapter is a combination of a pair of adapter half bodies 1 having the same semi-arcuate shape, so that a tape reel for a short time (for example, 60 minutes) can be used for a tape reel for a long time tape cassette. Can be changed to reel. The adapter half 1 is, for example, an outer peripheral portion 2 having a semi-circular arc with an appropriate diameter for use for 60 minutes.
The main body is composed of the inner peripheral portion 3 fitted to the outer peripheral surface of the boss of the tape reel of the long-time tape cassette, and the middle peripheral portion 4 arranged between the outer peripheral portion 2 and the inner peripheral portion 3. Each of them is concentrically connected by a plurality of radial ribs 5 and ribs 6. The ribs 5 and 6 are arranged in a staggered manner so as not to be on the same line, and the height dimensions of both ribs 5 and 6 are the outer peripheral portion 2 having the same height dimension.
It is about 60% of the height of the inner peripheral portion 3 and the middle peripheral portion. Further, as shown in FIG. 2B, the ribs 5 and 6 are arranged so as to be located substantially at the centers of the outer peripheral portion 2, the inner peripheral portion 3 and the middle peripheral portion 4, so that the upper and lower portions facing the flange are vertically aligned. The end is an open end that is separated from the outer peripheral portion 2, the inner peripheral portion 3, and the middle peripheral portion 5 by a predetermined distance.

One end side of the outer peripheral portion 2 and the middle peripheral portion 4 is an open end, and a hook portion 7 having a width within the height of the rib is formed from the rib positioned at the end portion, while the other end portion of the other end side is formed. An engaging portion 8 capable of locking the hook portion 7 is formed at the end of the outer peripheral portion 2 so as to project toward the inner surface.

The end faces of the arcs of the inner peripheral portion 3 and the middle peripheral portion 4 are closed by the ribs 9a and 9b having the same height as the inner peripheral portion 3 and the middle peripheral portion 4, but as described above. The inner and outer ribs of all ribs are arranged in a staggered pattern.

By integrally forming the adapter half body 1 having the above-mentioned structure by injection molding with a synthetic resin or the like, the point-symmetrical adapter half body 1 having the same shape can be obtained, and the parts management becomes easy. To assemble the pair of adapter halves 1 and 1, the leader tape TL is inserted into the concave portion of the side surface of the hub 10 of the tape reel of the long-time tape cassette and fixed by the clamp 11. Then, one of the adapter halves 1 is arranged as shown in FIG. 1 and the other half is inverted (on the other side) so that both are fitted to the boss 10 of the tape reel of the long-time tape cassette as shown in FIG. By locking the portion 7 and the engaging portion 8 to each other, the tape reel of the long-time tape cassette can be changed to the short-time tape reel.

Thereafter, another flange 13 is welded to the upper surface of the hub 10 opposite to the flange 12 to complete a short-time large-diameter tape reel.

3 (A) and 3 (B) are adapter half bodies showing a modified example of the present invention. The difference from the above embodiment is that in FIG. 3 (A), the hook portion 7 and the engaging portion 8 are engaged with each other. In order to strengthen the joint, the base portion 2a of the engaging portion 8 is thickened toward the inner surface. Further, in the same figure (B), deformation of the hook portion 7 is prevented by providing a reinforcing rib 5a which is connected to the middle peripheral portion 4 at the lower center of the hook portion 7.

When the magnetic tape is wound around the outer peripheral portion 2 of the tape reel having the above-described structure in a wound state for a predetermined length, the winding pressure of the tape acts on the outer peripheral portion 2. Since the upper and lower end portions of the rib 5 connected to the portion 2 and the middle peripheral portion 4 are open, deformation corresponding to the winding pressure is possible, and the load on the upper and lower edge portions of the magnetic tape is reduced in strength. The tape damage can be reduced.

Further, the inner peripheral portion 3 and the outer peripheral portion 2 are provided with the intermediate peripheral portion 4 in a double structure, and the radial ribs are arranged in a zigzag manner in each space to improve the cylindricity. ing. Further, since the conventional clamp can be used as it is for the connection with the leader tape, the connection strength can be maintained as before.

[0020]

According to the tape reel of the present invention,
When changing the tape reel of the long-time tape cassette to construct a short-time tape reel, damage to the edge of the magnetic tape can be suppressed, and a pair of adapter halves of the same shape can be combined. Since it can be used, it is possible to simplify the manufacturing process and the parts management without the need to use right and left. Moreover, since the conventional clamp can be used as it is for the connection with the leader tape, the connection strength can be maintained as in the conventional case.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a half body of a tape reel adapter of the present invention.

2A and 2B are a plan view and a sectional view of a tape reel in which the adapter half body of FIG. 1 is assembled.

3A and 3B are modified examples of the engaging portion and the hook portion of the present invention.

FIG. 4

[Explanation of symbols]

1 ... Adapter half, 2 ... Outer peripheral part, 3 ... Inner peripheral part, 4 ... Middle peripheral part, 5,6 ... Rib, 7 ... Hook part, 8 ... Engagement part.

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[Procedure amendment]

[Submission date] November 17, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a half body of a tape reel adapter of the present invention.

2A and 2B are a plan view and a sectional view of a tape reel in which the adapter half body of FIG. 1 is assembled.

3A and 3B are modified examples of the engaging portion and the hook portion of the present invention.

[Explanation of Codes] 1 ... Adapter half, 2 ... Outer peripheral part, 3 ... Inner peripheral part, 4 ... Middle peripheral part, 5, 6 ... Rib, 7 ... Hook part, 8 ... Engaging part.

Claims (1)

[Claims] 1. A short-time tape reel by combining and fitting a pair of adapters divided into semi-circular arcs to a small-diameter hub portion of a tape reel for winding a long-time magnetic tape. In a tape reel forming a corresponding large-diameter hub portion, the pair of adapters are provided with the same height and concentric outer peripheral portion, middle peripheral portion, and inner peripheral portion, and a plurality of radial portions are provided between the peripheral portions. A rib that is connected by a rib and that connects at least the outer peripheral portion and the middle peripheral portion of the plurality of radial ribs is arranged at a substantially middle portion between the heights of the outer peripheral portion and the middle peripheral portion. A tape reel characterized in that the tape reel has an open end that is separated from the edges of the outer peripheral portion and the middle peripheral portion by a predetermined distance.