JP2593068Y2 - Tape reel for tape cassette - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a video cassette, a magnetic tape cartridge, and other tape cassettes, and more particularly to an improvement in a tape reel used for a magnetic tape cassette in which a reel having a tape wound thereon is rotatably provided.

[0002]

2. Description of the Related Art Conventionally, a tape reel incorporated in a video cassette comprises a reel hub a around which a tape is wound and a pair of flanges b as shown in FIG. The clamp d is fitted in the concave groove c, and the convex portion e and the concave portion f formed on the opposing surface of the concave groove c and the clamp d are engaged to prevent the clamp from coming off.

[0003]

However, in the fitting of the convex and concave portions of the conventional structure for preventing the clamp from coming off, the convex portion e of the clamp d is projected, so that it is difficult to fit and assemble. There is a risk that the engagement state may be disturbed due to the small projections and recesses, and the recesses f formed in the recesses c of the reel hub a may be manufactured by using a slide core mold. As a result, the number of mold parts increases, which increases costs, the mold structure becomes complicated, the number of products is limited, and mold separation adjustment due to poor sliding of the slide core part is troublesome. In addition, there is a problem that the maintenance performance is increased due to abrasion of the mold, as well as a problem that the performance is not improved. The present invention is intended to accurately eliminate these conventional disadvantages, and is easy to fit into a reel hub, can be tightened and positioned, and can be securely and securely removed by press-fitting. Along with improving reliability, the cost of the mold is greatly reduced by simplifying the mold parts and increasing the number of parts, and the frequency of maintenance is reduced, and the safety of handling the tape reel incorporated in the cassette is also improved. It is an object of the present invention to provide a tape reel that can be used.

[0004]

The present invention comprises a reel hub 1 on which a tape is wound, and a reel flange 2 attached to an end of the reel hub 2.
In the tape reel, a concave groove 4 is formed on the outer periphery of the tape reel, the concave groove 4 being capable of engaging with the clamp 3, and the concave and convex locking portions for stopping the clamp are provided on the opposing surface of the clamp 3 and the concave groove 4. A protruding clamp retaining protrusion 5 and a fitting groove 6 into which the protrusion 5 is inserted are provided along the longitudinal direction of the concave groove 4 from one end of the reel hub. A tape reel for a tape cassette, characterized in that the taper groove is formed so as to be press-fitted.

[0005]

When the clamp is mounted on the reel hub of the tape reel, the clamp is inserted into the concave groove in the reel hub and pushed in, and the clamp retaining projection on the clamp is guided into the tapered fitting groove in the concave groove. When it is inserted and pushed in, it stops in the press-fit state while the resistance increases sequentially in the wedge-shaped groove, the clamp can be positioned, it is hard to come off, and the tape can be clamped accurately and safely.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 to 4 using a video tape cassette as an example.
Is incorporated in a case 8 composed of an upper case and a lower case.
A reel flange 2 attached to an end of the reel hub 1; a concave groove 4 capable of engaging a clamp 3 is formed on an outer periphery of the reel hub 1; Tape reels 7 each having a pair of convex and concave locking portions provided opposite each other, wherein a fitting groove 6 into which the clamp removal preventing convex portion 5 projecting from the clamp 3 is fitted is formed from one end of the reel hub to the concave groove 4. It is provided along the longitudinal direction, and is formed into a tapered groove so that the fitting groove 6 is pressed into the convex portion 5.

In this case, since the fitting groove 6 formed in the concave groove 4 of the reel hub 1 is formed to be open at the upper end edge of the reel hub 1, it is manufactured without using a slide core mold at the time of molding. Since the number of mold parts can be reduced, the number of parts can be reduced and production can be performed at low cost.Since the mold structure can be increased, the number of products can be increased. You can do it.

The fitting groove 6 is a wedge-shaped groove whose width is gradually reduced as it goes forward, and is provided substantially at the center of the reel hub in the vertical direction. It can also be a groove.

A ring groove 10 is formed on the upper end surface of the reel hub 1 and welding ribs (not shown) of an annular ridge engaging with the ring groove 10 are formed on the reel flange 2. The tape reel 7 has a configuration in which the reel hub 1 and the reel flange 2 are fixedly integrated by heat-welding the reel hub 1 in the fitted state. The clamp 3 can be detached from the tape reel without any trouble.
In the figure, 13 is a front lid, 14 is a front lid locking member, and 15 is a reel brake piece.

In the embodiment shown in FIG. 5, the fitting groove 7 formed in the reel hub 1 has a slight undercut 12 at a position near the leading end of the groove. Even if such a force acts, the undercut 12 prevents the force, which helps to prevent pulling out, thereby enhancing safety.

[0011]

According to the present invention, a clamp retaining projection protruding from a clamp and a fitting groove into which this is fitted are provided along one longitudinal direction of the groove from one end of the reel hub. The tapered groove that is press-fitted into the convex portion makes it easy to insert the tape mounting clamp into the reel hub, and also enables tightening positioning. Of the tape reel incorporated in the cassette as well as improving reliability by improving the reliability by simplifying the molding die parts and increasing the number of parts. The safety of handling can be enhanced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention in a separated state.

FIG. 2 is an enlarged perspective view of a partly separated state in the example of FIG.

FIG. 3 is an enlarged front view of a partly separated state in the example of FIG. 2;

FIG. 4 is an enlarged vertical sectional view of the assembled and used state in FIG. 1;

FIG. 5 is an enlarged front view of a partly separated state of another embodiment of the present invention.

FIG. 6 is a perspective view showing a conventional example in a separated state.

[Description of Signs] 1 Reel Hub 2 Reel Flange 3 Clamp 4 Concave Groove 5 Clamp Retaining Protrusion 6 Fitting Groove 7 Tape Reel 8 Case 9 Tape 10 Ring Groove 11 Clamp Hole 12 Undercut

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G11B 23/087 508

Claims (3)

(57) [Scope of request for utility model registration] A reel hub on which a tape is wound, and a reel flange attached to an end of the reel hub.
And a concave groove 4 on the outer periphery of the reel hub 1 with which the clamp 3 can be engaged. In the reel, a clamp retaining protrusion 5 protruding from the clamp 3 and a fitting groove 6 into which the protrusion 5 is fitted are provided from one end of the reel hub along the longitudinal direction of the concave groove 4. A tape reel for a tape cassette, wherein the taper groove is formed so as to be press-fitted into the convex portion 5. 2. The tape according to claim 1, wherein the fitting groove is a wedge-shaped groove whose width is gradually reduced as it goes forward, and is provided substantially at the center of the reel hub in the vertical direction. reel. 3. The tape reel according to claim 1, wherein the fitting groove has an undercut at a position near the tip of the groove.