JPH08287644A - Reel for tape cassette and tape cassette - Google Patents

Abstract

PURPOSE: To obtain a reel for tape cassette withstanding the dropping impact, in regard to reels for the tape cassettes of a video tape recorder, a digital video tape recorder, etc., or for the tape cassette used for an open reel. CONSTITUTION: This reel for tape cassette is constituted in such a manner that an upper flange 4 is connected through a hub part against a lower flange 3 provided with the cylindrical hub part 2 on which a tape-like recording medium is wound. A cylindrical connecting means 11 is provided nearly at the center of the upper flange 4 and mounted by connecting it to the inside of the hub part 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, tape cassettes for video tape recorders (hereinafter referred to as VTRs) and digital audio tape recorders (hereinafter referred to as DATs) and reels for tape cassettes used for open reels. Regarding

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, a tape cassette reel 1 has a lower flange 3 formed integrally with a cylindrical hub portion 2 around which a tape-shaped recording medium is wound.
It is known that a lower flange 3 and an upper flange 4 formed of a different material having substantially the same size as the lower flange 3 are connected to each other via the hub portion 2.

The hub portion 2 includes an outer hub 5 and an inner hub 6.
Are arranged concentrically, and a plurality of connecting ribs 7 are radially installed at equal intervals in the circumferential direction in the space between the inner peripheral wall surface of the outer hub 5 and the outer peripheral wall surface of the inner hub 6. The hubs 5 and 6 are connected to each other.

On the upper end surface of the inner hub 6 (the surface contacting the upper flange 4), six cylindrical caulking pins 8 are planted at equal intervals in the circumferential direction.

A fitting hole 9 for the caulking pin 8 is formed through the upper flange 4 at a position corresponding to each caulking pin 8 of the inner hub 6.

Therefore, when the tape reel 1 is assembled, the fitting holes 9 of the upper flange 4 are fitted into the caulking pins 8 of the hub portion 2 and protrude from the opening surface of the fitting holes 9. The tip portion of the caulking pin 8 is melted and crushed by a welding means such as ultrasonic waves or heat, and the deformed tip portion is engaged with the fitting hole 9 as shown in FIG. 2 and the upper flange 4 are integrally connected.

In this way, the tape cassette reel 1 according to the conventional example has the flange 3 and the upper flange 4 via the hub portion 2.
And are formed integrally with each other so as to face each other.

[0008]

[Problems to be Solved by the Invention] However, the VTR
L, which is mainly used for commercial β-cam (trademark) etc.
The cassette has a large radius of the flange of the reel 1,
Since the amount of tape-shaped recording medium wound around the hub portion 2 is large, the weight of the entire cassette is heavy.

Therefore, when a heavy tape cassette such as the L cassette is dropped on the floor or the like, the impact of the drop becomes extremely large, and particularly when dropped on the surface of the cassette, tape-like recording is performed on the entire surface of the upper flange 4. The medium slips off and a large impact force is applied.

Then, there is a problem that the impact force is concentrated on the crimping pin 5 of the hub portion 2 and the crimping portion is broken, so that the upper flange 4 may come off from the hub portion 2.

The caulked portion of the upper flange 4 is
As shown in FIG. 6, the caulking pin 5 penetrates through the fitting hole 6, and the tip portion thereof is caulked so as not to project outside, so that the thickness is thin.

Therefore, since the portion where the wall thickness of the upper flange 4 changes is weak in strength, it is possible that the impact force at the time of dropping may cause cracking or cracking in some cases. There was a problem to say.

As described above, the conventional tape cassette reel has a problem to be solved in terms of strength in the structure in which the upper flange is coupled via the hub portion. The present invention
The present invention has been made in view of the above problems, and an object thereof is to provide a tape cassette reel that is resistant to a drop impact and a tape cassette that uses the reel.

[0014]

SUMMARY OF THE INVENTION The gist of the tape cassette reel according to the present invention to solve the above-mentioned problems is to provide a taper-shaped recording medium on which a lower flange having a cylindrical hub portion is wound. A reel for a tape cassette, in which a flange is coupled via a hub portion, wherein a tubular coupling means is provided substantially in the center of the upper flange, and the coupling means is coupled to and mounted inside the hub portion. .

And, the coupling of the coupling means is performed by screwing with a spiral rib projecting on the inner side of the hub portion and the outer peripheral surface of the cylindrical coupling means; ,
Being provided on the peripheral wall of the tubular portion for one rotation or more; Further, the tip of the rib is rounded due to the loosening of the binding force, and the rib is inclined toward the end from the tip to the base end. However, a predetermined R portion is provided on the base end portion; and the upper flange has a uniform thickness.

Further, in the tape cassette according to the present invention, the lower flange provided with the cylindrical hub portion around which the tape-shaped recording medium is wound is provided with the tubular connecting means provided substantially in the center of the upper flange. It is equipped with a reel for a tape cassette that is attached to the inside of and attached with an upper flange.

[0017]

According to the tape cassette reel of the present invention, the upper flange is joined to the lower flange on the inner side of the hub portion, the fixed contact area for fixing the upper flange is increased, the joining strength is increased, and the tape is dropped. It does not come off during impact. Further, the thickness of the upper flange is uniform and there is no thin portion, and damage such as cracking due to a drop impact is prevented. Eventually, the tape cassette of the present invention is a cassette structurally resistant to a drop impact.

[0018]

Embodiments of the present invention will now be described in detail with reference to the drawings. For ease of understanding, portions corresponding to the conventional example will be described with the same reference numerals as the conventional example.

In the first embodiment of the present invention, as shown in FIGS. 1 and 2, a cylindrical hub portion 2 around which a tape-shaped recording medium is wound around a synthetic resin lower flange 3 is integrated in the central portion. Mold.

In the hub portion 2, the outer outer hub 5 and the inner inner hub 6 are concentrically arranged, and between the inner peripheral wall surface of the outer hub 5 and the outer peripheral wall surface of the inner hub 6. A plurality of ribs 7 are radially installed in the space portion at equal intervals in the circumferential direction to connect the hubs 5 and 6 to each other.

Further, a spiral rib 10 is provided on the inner peripheral wall surface of the inner hub 6 over at least one rotation. The lead angle of the rib 10 is β.

Next, in the lower flange 3 and the synthetic resin upper flange 4 made of a different material, as shown in FIG.
At the center thereof, a cylindrical coupling member 11 having a size loosely inserted into the inner hub 6 and contained therein is integrally molded as a coupling means,
On the outer peripheral surface of the connecting member 11, a spiral rib 12 which can be screwed with the rib 10 is integrally projected.

The rib 12 is also provided on the outer peripheral surface of the cylindrical coupling member 11 over at least one rotation.

The lead angle of the rib 12 is α, and the lead angle β of the rib 10 is α = β.

The shape of the ribs 10 and 12 is shown in FIG.
As shown in, the tip portion 13 of the rib is rounded and is inclined so that it extends toward the end from the tip portion 13 to the base end portion 14.

The base ends of the ribs 10 and 12 are
A predetermined R portion is provided and reinforced for strength. Therefore, by screwing the ribs 10 and 12 one rotation or more, a wide contact area can be obtained and a snap fit can be achieved, and the coupling force between the lower flange and the upper flange becomes stronger.

Further, the wall thickness of the upper flange 4 is formed so as to be uniform from the central portion to the peripheral portion of the flange. This is because it is not necessary to form a fitting hole for the caulking pin, such as the upper flange according to the conventional example, in the first embodiment according to the present invention.

As a result, the strength of the connecting portion between the flange portion of the upper flange 4 and the tubular coupling member 11 is also improved.

In order to connect the lower flange 3 and the upper flange 4 thus formed to each other to form an integral tape cassette reel, in the hub portion 2 provided at the central portion of the lower flange 3. Inner hub 6, upper flange 4
It is carried out by combining the tubular coupling members 11 provided in the above and rotating and screwing the spiral ribs 10 and 12 provided on the inner and outer peripheral surfaces of each one more than one rotation.

Therefore, the tape cassette reel according to the first embodiment of the present invention is firmly connected by the inner hub 6 having the spiral rib 10 or 12 and the cylindrical connecting member 11.

In the tape cassette equipped with the tape cassette reel having the snap-fit type ribs, even if the tape-shaped recording medium is concentrated on the floor surface and the tape-shaped recording medium is concentrated on the floor flange, the impact force is generated. The ribs 10 and 12 that are in wide contact with each other instead of being in point contact are not dispersed and the upper flange is prevented from coming off, and the entire cassette vigorously resists a drop impact.

Further, since the upper flange 4 has a uniform thick wall, the drop impact force does not concentrate on the thin wall portion, so that the flange is not cracked.

The sectional shapes of the ribs 10 and 12 are as follows.
The shape is not limited to that shown in FIG.

[0034]

As described above, in the tape cassette reel according to the present invention, the upper flange is provided with the hub portion via the hub portion, while the lower flange is provided with the cylindrical hub portion around which the tape-shaped recording medium is wound. In a reel for a tape cassette, which is joined, a tubular joining means is provided substantially in the center of the upper flange, and the joining means is attached inside the hub portion so that the lower flange and the upper flange are joined together. This has an excellent effect that the upper flange is not disengaged from the caulked portion even if the drop impact force of the tape cassette is applied.

Further, since the upper flange is formed to have a uniform thickness, the thin portion for caulking such as in the conventional upper flange is eliminated, and a crack is generated in the thin portion due to concentrated impact force. It has an excellent effect that the quality is improved.

In the tape cassette according to the present invention, the lower flange having the cylindrical hub portion around which the tape-shaped recording medium is wound is provided with the cylindrical connecting means provided substantially at the center of the upper flange inside the hub portion. Since it is equipped with a tape cassette reel that is attached to the upper flange with the upper flange attached, the tape cassette will be cracked even if the tape-shaped recording medium falls off the hub surface and the tape-shaped recording medium comes out of the hub and collides with the upper flange. It has an excellent effect that it becomes a cassette that is strong against drop impact without the upper flange coming off or coming off.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a lower flange according to a first embodiment of the present invention.

FIG. 2 is a front view of the upper flange according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view of a spiral rib according to the first embodiment of the present invention.

FIG. 4 is a perspective view of a lower flange according to a conventional example.

FIG. 5 is a perspective view of a cassette tape reel according to the conventional example.

FIG. 6 is a perspective view (a) of a cassette reel according to the conventional example and a cross-sectional view (b) taken along line AA.

[Explanation of symbols]

 1 tape cassette reels, 2 hub parts, 3 lower flanges, 4 upper flanges, 5 outer hubs, 6 inner hubs, 7 connecting ribs, 10 ribs, 11 coupling members, 12 ribs, 13 tip parts, 14 base end parts.

Claims (6)

[Claims] 1. A reel for a tape cassette in which an upper flange is coupled via a hub portion to a lower flange having a cylindrical hub portion around which a tape-shaped recording medium is wound, the upper flange being substantially the same. A reel for a tape cassette, characterized in that a cylindrical coupling means is provided at the center, and the coupling means is coupled and mounted inside the hub portion. 2. The coupling means is coupled by screwing with a spiral rib projecting from the inside of the hub portion and the outer peripheral surface of the cylindrical coupling means. Reel for the listed tape cassette. 3. The tape cassette reel according to claim 2, wherein the spiral rib is provided on the peripheral wall of the cylindrical portion over one rotation or more. 4. The rib has a rounded tip portion, is inclined so that it extends toward the end from the tip portion to the base end portion, and a predetermined R portion is provided at the base end portion. The tape cassette reel according to claim 2. 5. The tape cassette reel according to claim 1, wherein the upper flange has a uniform thickness. 6. A lower flange having a cylindrical hub portion around which a tape-shaped recording medium is wound, and a cylindrical coupling means provided substantially in the center of the upper flange is coupled to the inside of the hub portion to form the upper flange. The tape cassette is equipped with a reel for tape cassette with attached.