JPH0719872U - Tape reel for tape cassette - Google Patents

Abstract

(57) [Summary] [Purpose] The clamp is securely attached to the reel hub, making it difficult for it to come off and increasing reliability, while simplifying the molding die parts and increasing the number of parts to achieve a significant cost reduction. In addition, the frequency of maintenance is reduced, and the safety of handling the tape reel incorporated in the cassette is improved. [Structure] Clamp retaining projection 5 protruding from clamp 3
And a fitting groove 6 into which the fitting groove 6 is fitted is provided from one end of the reel hub along the longitudinal direction of the concave groove 4, and the fitting groove 6 is a tapered groove which is press-fitted into the convex portion 5. By doing so, it is easy to fit the clamp into the reel hub, and it is possible to tighten and position it.
It can be installed securely in the cassette because the locking and mounting is reliable and it is hard to come off to improve reliability, and the cost is greatly reduced by simplifying the molding die parts and increasing the number of parts, and the maintenance frequency is reduced. The safety of handling tape reels can also be improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a video cassette, a magnetic tape cartridge, and other tape cassettes, in particular, a tape reel used for a magnetic tape cassette in which a reel wound around a tape is rotatably arranged.

[0002]

[Prior art]

 Conventionally, a tape reel incorporated in a video cassette consists of a reel hub a around which the tape is wound and a pair of flanges b, as shown in FIG. 6, and a groove c formed on the outer periphery of the reel hub a. The clamp d is fitted, and the convex portion e and the concave portion f formed on the facing surfaces of the concave groove c and the clamp d are engaged with each other to prevent the clamp from coming off.

[0003]

[Problems to be solved by the device]

 However, in the conventional fitting of convex and concave portions of the clamp retaining structure, since the convex portion e of the clamp d is projected, it is difficult to fit and assemble, and in addition, the convex and concave portions for which the locking state is small are small. Therefore, it may come off or come loose, which may cause troubles. Moreover, since the concave portion f formed in the concave groove c of the reel hub a is manufactured by using the slide core mold for molding, the number of mold parts is reduced. This will increase the cost, increase the cost, increase the complexity of the mold structure, limit the number of products that can be manufactured, and make it difficult to adjust the mold separation due to poor sliding of the slide core. In addition to problems, there was a drawback that the maintenance frequency was high due to die wear. The present invention is intended to properly eliminate these drawbacks of the related art.Easy to fit and incorporate into the reel hub, it is also possible to tighten and position, and press-fitting ensures secure locking and hard removal. In addition to improving reliability, simplification of the molding die parts and a large number of cost increases greatly reduce costs, maintenance frequency is reduced, and the safety of handling tape reels incorporated in cassettes is improved. The purpose is to provide a tape reel that can also improve the price.

[0004]

[Means for Solving the Problems]

 The present invention comprises a reel hub 1 around which a tape is wound, and a reel flange 2 attached to an end of the reel hub 2, and a groove 4 for engaging a clamp 3 is formed on the outer circumference of the reel hub 1. In a tape reel in which convex-concave locking portions for preventing clamp release are provided on the opposing surfaces of the clamp 3 and the concave groove 4, respectively, the convex portions 5 for preventing clamp release protruding from the clamp 3 and the fitting fit. A fitting groove 6 is provided from one end of the reel hub along the longitudinal direction of the concave groove 4, and the fitting groove 6 is a tapered groove that is press-fitted into the convex portion 5. It is a tape reel for tape cassettes.

[0005]

[Action]

 When mounting the clamp on the reel hub of the tape reel, insert the clamp into the groove on the reel hub and push it in.The clamp retaining projection on the clamp is guided and inserted into the tapered fitting groove on the groove. When pushed in, the resistance gradually increases in the wedge-shaped groove, and when the press-fitting state stops, the clamp can be positioned, and it becomes difficult for it to come off, and the tape can be clamped properly and safely.

[0006]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. 1 to 4 by using a video tape cassette as an example. In the case where the tape reel 7 is assembled in a case 8 composed of an upper case and a lower case, the tape 9 is A reel hub 1 to be fitted and a reel flange 2 attached to an end of the reel hub 1 are provided, and a concave groove 4 into which a clamp 3 can be engaged is formed on the outer periphery of the reel hub 1 and the clamp 3 is formed. A tape reel (7) is provided with convex-concave locking portions for preventing clamps from engaging on the surface facing the concave groove (4), and a fitting groove (6) into which the convex portions for preventing clamps (5) protruding from the clamp (3) are fitted. Is provided from one end of the reel hub along the longitudinal direction of the concave groove 4, and the fitting groove 6 is 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 so as to open at the upper edge of the reel hub 1, the slide core mold is not used in the molding. As a result, the number of mold parts can be simplified and production at low cost can be achieved.Since the mold structure can be simplified, the number of products can be increased. It can be improved.

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

A ring groove 10 is formed on the upper end surface of the reel hub 1, and an annular rib welding rib (not shown) that engages with the ring groove 10 is formed on the reel flange 2. The reel hub 1 and the reel flange 2 are heat-welded and fixed to each other to form a tape reel 7 in a fitted state, and the clamp 3 can be fitted and removed from the clamp hole 11 of the reel flange 2. The clamp 3 is designed so that it can be accurately and easily operated, and the clamp 3 can be removed from the tape reel without any problems. 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 of FIG. 5, the fitting groove 7 formed in the reel hub 1 is provided with a slight undercut 12 near the tip of the groove, so that the clamp retaining projection 5 of the clamp 3 comes out. Even if a force to do so acts, the undercut 12 prevents the undercut 12 to help prevent extraction, thus improving safety.

[0011]

[Effect of device]

 According to the present invention, a clamp retaining projection protruding from a clamp and a fitting groove into which the fitting is inserted are provided from one end of the reel hub along the longitudinal direction of the groove, and the fitting groove is provided with respect to the projection. By making the taper groove so that the tape can be press-fitted, it is easy to fit the tape mounting clamp into the reel hub, and it is also possible to tighten and position it. It is difficult to improve reliability, and simplification of molding die parts and a large number of manufacturing steps greatly reduce the cost, and the maintenance frequency is also reduced, so that the tape reel incorporated in the cassette can be handled safely. It can also enhance sex.

[Brief description of drawings]

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

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

FIG. 3 is an enlarged front view of a part of a separated state in the example of FIG.

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

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

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

[Explanation of symbols]

 1 Reel hub 2 Reel flange 3 Clamp 4 Recessed groove 5 Clamp retaining protrusion 6 Fitting groove 7 Tape reel 8 Case 9 Tape 10 Ring groove 11 Clamp removal hole 12 Undercut

Claims (3)

[Scope of utility model registration request] 1. A reel hub 1 around which a tape is wound, and a reel flange 2 attached to an end of the reel hub 2.
And a concave groove 4 capable of engaging the clamp 3 is formed on the outer periphery of the reel hub 1, and a convex / concave locking portion for preventing the clamp from coming out is provided on a surface facing the clamp 3 and the concave groove 4, respectively. In the reel, a clamp retaining projection 5 projecting from the clamp 3 and a fitting groove 6 into which the fitting is inserted are provided from one end of the reel hub along the longitudinal direction of the concave groove 4, and the fitting groove 6 is formed. A tape reel for a tape cassette, characterized in that the taper groove is formed so as to be pressed into the convex portion 5. 2. The tape according to claim 1, wherein the fitting groove 6 is a wedge-shaped groove whose groove width is gradually reduced as it goes forward, and is provided almost up to the center of the reel hub in the longitudinal direction. reel. 3. The tape reel according to claim 1, wherein the fitting groove 6 is provided with an undercut at a position near the tip of the groove.