JPH1083652A - Reel cassette - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive and compact reel cassette with a simple structure, while stabilizing the rotation of a tape reel by keeping the load at the rotation to the minimum in company with preventing the generation of chips on the inside surface of a cassette case. SOLUTION: The reel cassette, which is provided with the structure such as two tape reels 6 having a pair of flanges 3 at both sides of a reel hub 2 are freely rotatably arranged side by side in the cassette case 1 consisting of a pair of cassette halves 4 formed from synthetic resin, is constituted in such a manner that an annular rib 13, the section of which is formed to be semicircular, is arranged on the outside surface of outer peripheral part of the flange 3 confronted with the inner side surface of the cassette half 4, while projecting toward the inner side surface of the cassette half 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel cassette used for, for example, a video tape cassette.

[0002]

2. Description of the Related Art As a conventional reel cassette for video tape, as shown in FIGS. 9 and 10, a tape remaining amount display window hole 2 formed by punching a thin aluminum plate material.
Tape reel 2 made by fixing a pair of flanges 26 having a pair of flanges 6c to upper and lower sides of a reel hub 23 made of synthetic resin.
7 is used.

As shown in FIG. 9, each hub receiver 2 of a pair of upper and lower cassette halves 22 forming a cassette case is provided.
There is a certain clearance between the annular end faces 22b of the reel hub 2a and the annular bottom faces 23b of the respective central circular recesses 23a of the reel hub 23 opposed to the annular end faces 22b for smooth rotation of the tape reel 27. I have.

For this reason, in the case where the right side in the drawing of the reel hub 23 moves upward in the drawing and the left side in the drawing of the reel hub 23 moves downward in the drawing within the range of the clearance during the rotation of the reel hub 23. The tape reel 27 is inclined as shown. As a result, as shown in FIG. 10, a state may occur in which the corner 26 b of the outer peripheral end of the flange 26 rotates while contacting the inner surface of the cassette half 22.

Other conventional reel cassettes include:
As shown in FIG. 11, the reel hub 31 of the tape reel 30 is caused to engage with the fitting recess 31 a by the distal end of the reel pressing spring 37 partially fixed inside the upper case 35.
9 and FIG. 10 are pressed toward the lower case 34 while being fitted to the drive shaft 32 provided on the lower case 34 side.
There is a reel cassette in which the tape reel 30 does not tilt in a cassette case like the conventional reel cassette shown in FIG.

[0006] Since the tape reel 30 of such a reel cassette rotates while being in contact with the reel holding spring 37, the tape reel 30, which is a separate member provided at the center of the upper reel flange 33 in contact with the reel holding spring 37, is used.
It is formed of an expensive resin such as polyacetal resin having high abrasion resistance, or a ceramic ball.

[0007]

However, in the conventional video tape reel cassette as shown in FIGS. 9 and 10, the corner 26b of the outer peripheral end of the flange 26 formed of an aluminum plate is formed of a tape. Reel 2
When 7 is inclined, it rotates while being in contact with the inner surface of the cassette half 22 made of synthetic resin such as ABS resin.

In such a case, there is a possibility that shavings may be generated from the inner surface of the cassette half 22 made of a synthetic resin such as ABS resin, which is inferior in hardness and wear resistance as compared with aluminum. If the scraps thus generated adhere to the magnetic tape, they cause reproduction failure. If the scraps enter the gap between the annular end face 22b of the cassette half 22 and the annular bottom face 23b of the reel hub 23, the tape reel 27 rotates. There is a problem that the load at the time increases and the rotation becomes unstable, and in some cases, the rotation of the tape reel 27 stops.

On the other hand, in the conventional reel cassette as shown in FIG. 11, since the tape reel 30 is provided with means for preventing the tape reel 30 from tilting, the conventional tape cassette shown in FIGS. Although there are no problems as in the examples, the materials used are expensive, and the number of parts increases, which complicates the structure, resulting in an increase in manufacturing costs and an increase in thickness, resulting in an increase in size. was there.

Accordingly, the present invention prevents the generation of shavings on the inner surface of the cassette case, stabilizes the rotation of the tape reel by minimizing the load during rotation, and is simple, inexpensive and compact. It is an object of the present invention to provide a reel cassette.

[0011]

According to the present invention, there is provided a tape case having a pair of flanges on both sides of a reel hub in a cassette case comprising a pair of cassette halves formed of synthetic resin. In the reel cassette having a structure in which the cassette half is rotatably arranged in parallel, a cross-section is formed in a semicircular shape on the outer surface of the flange outer peripheral portion facing the inner surface of the cassette half, protruding toward the inner surface of the cassette half. The contact projection is provided.

According to the reel cassette having such a configuration, the flange 26 having a flat outer peripheral portion 26a instead of the flange 26 used for the tape reel 27 of the conventional reel cassette shown in FIGS. 9 and 10 is used. In order to use a flange provided with a contact convex portion having a semicircular cross-section and projecting toward the inner surface of the cassette half on the outer surface of the outer peripheral portion facing the inner surface of the cassette half, the tape reel is inclined. Even when rotated, the corner of the outer peripheral end of the flange does not contact the inner surface of the cassette half, but the contact convex portion formed by the curved surface of the outer peripheral portion of the flange comes into contact,
The generation of shavings on the inner surface of the cassette half can be prevented, and the rotation of the tape reel can be stabilized by minimizing the load during rotation.

Further, according to the reel cassette having the above-described structure, since the reel pressing spring 37 as in the conventional reel cassette shown in FIG. 11 is unnecessary, the structure is not complicated and large, and it is formed of an expensive material. Since there is no need for such a protruding portion 36, it has a simple structure,
A small and inexpensive reel cassette can be provided.

[0014]

Embodiments of the present invention will be described below in detail and specifically with reference to the accompanying drawings. 1 to 5 are views showing a first embodiment of a reel cassette according to the present invention.

As shown in FIG. 1, in a cassette case 1 comprising a pair of upper and lower cassette halves 4, two tape reels 6 having a pair of flanges 3 formed on both upper and lower sides of a reel hub 2 are arranged side by side. (See FIG. 5), the upper and lower flanges 3 are formed of an aluminum plate, and the upper and lower flanges 3 are fixed to both upper and lower sides of a reel hub 2 formed of a synthetic resin material such as ABS resin.

As shown in FIGS. 1 to 4, a tape remaining amount display window hole 3a is formed in a flange 3 formed of the above-mentioned aluminum plate material, and an outer peripheral portion thereof is opposed to an inner surface of the cassette half 4. An annular rib (contact convex portion) 13 having a semicircular cross-section and projecting continuously in the circumferential direction is formed on the side surface 3 b of the flange 3. Are formed integrally.

A predetermined clearance 10 exists between the annular end surfaces 1b of the hub receivers 1a of the cassette half 4 and the annular bottom surfaces 2b of the central circular recesses 2a of the respective reel hubs 2 opposed to the annular end surfaces 1b. doing. If the tape reel 6 is tilted during rotation of the tape reel 6 within the range of the clearance 10, the curved end portion of the annular rib 13 of the flange 3 is rotated while contacting the inner surface of the cassette half 4. Has become.

That is, when the tape reel 6 is tilted during rotation, the annular rib 13 is so arranged that the tip of the annular rib 13 contacts the inner surface of the cassette half 4 more than the corner 3c of the outer peripheral end of the flange 3. Thirteen heights are set.

According to the reel cassette according to the first embodiment having such a structure, the flange 2 used for the tape reel 27 of the conventional reel cassette shown in FIGS. 9 and 10 is used.
6, a flange 26 having a flat outer peripheral surface 26a.
Instead of a tape reel, a flange having a contact convex portion having a semicircular cross section and projecting toward the inner surface of the cassette half is provided on the outer surface of the outer peripheral portion facing the inner surface of the cassette half. Even if the cassette is rotated inclining, the corners of the outer peripheral end of the flange do not come into contact with the inner surface of the cassette half, and the contact convex portion formed by the curved surface of the outer peripheral portion of the flange comes into contact. Scraps can be prevented from occurring, and the rotation of the tape reel can be stabilized by minimizing the load during rotation.

Further, according to the reel cassette having the above-described structure, since the reel pressing spring 37 as in the conventional reel cassette shown in FIG. 11 is unnecessary, the structure is not complicated and large, and it is formed of an expensive material. Since there is no need for such a protruding portion 36, it has a simple structure,
A small and inexpensive reel cassette can be provided.

FIG. 6 and FIG. 7 are views showing a second embodiment of the present invention. In the first embodiment, the annular rib 13 having a semicircular cross section and being continuous in the circumferential direction is formed on the outer peripheral surface 3b of the flange 3. In the embodiment, hemispherical convex portions (contact convex portions) 8 are provided at six positions on the outer peripheral portion outer surface 3b of the flange 3 facing the inner surface of the cassette half 4 at circumferential intervals. In that they are integrally formed. According to the second embodiment, the same effects as those of the first embodiment can be obtained.

FIG. 8 is a diagram showing a third embodiment of the present invention. In the first and second embodiments, the annular rib 13 and the hemispherical projection 8 are formed on the outer peripheral surface 3b of the flange 3. On the other hand, in the third embodiment, On the outer surface of the flange 3 facing the inner surface of the cassette half 4 including the outer surface 3b, six ridges having a semicircular cross-section extending radially outward from the center side. (Contact convex portion) 11 is different in that it is formed integrally with the flange 3. According to the third embodiment, the same effects as those of the first and second embodiments can be obtained.

In each of the above embodiments, the annular rib 1
3, the case where the hemispherical convex portion 8 and the convex ridge portion 11 are formed integrally with the flange 3 of the aluminum material has been described, but the annular rib 13, the hemispherical convex portion 8 and the convex ridge portion are formed. Reference numeral 11 denotes another material having the same hardness as the aluminum material, and may be formed on the flange 3 as a separate member from the flange 3 by fixing or the like.

When the thickness of the aluminum plate flange 3 is small, the annular rib 13, the hemispherical convex portion 8, and the convex ridge portion 11 are integrally formed on the flange 3 by extrusion using a press or the like. It may be.

In the second and third embodiments,
Although the hemispherical projections 8 and the projections 11 were formed at six locations, they contacted the inner surface of the cassette half 4,
The number is not limited to six as long as the balance is maintained in a good state when the tape reel 6 rotates.

Further, in the above embodiment, the flange 3
Although the case where a thin aluminum plate material is used has been described, the flange 3 may be formed of a synthetic resin material, in which case the slidability is significantly improved as compared with the above embodiments.

[0027]

As described above, according to the reel cassette of the present invention, a semicircular cross-section is formed on the outer surface of the outer peripheral portion facing the inner surface of the cassette half, protruding toward the inner surface of the cassette half. Because the flange provided with the contact convex portion is used, even if the tape reel rotates at an angle, the corner of the flange outer peripheral end does not contact the inner surface of the cassette half and is formed by the curved surface of the outer peripheral portion of the flange. Since the contact projections thus contacted, it is possible to prevent the generation of shavings on the inner surface of the cassette half and to minimize the load during rotation of the tape reel, thereby stabilizing the rotation.

Further, according to the reel cassette having the above structure, the reel holding spring 37 as in the conventional reel cassette shown in FIG. 11 is unnecessary, so that the structure is not complicated and large, and it is formed of an expensive material. Since there is no need for such a protruding portion 36, it has a simple structure,
A small and inexpensive reel cassette can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view of a reel cassette according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a contact portion between an inner side surface of a cassette half 4 and an annular rib 13 of a flange 3 in FIG.

FIG. 3 is a top view showing an annular rib 13 of the flange 3 in FIG.

4 is a sectional view of the flange 3 in FIG.

FIG. 5 is a plan view schematically showing the entire cassette case 1 of the reel cassette in FIG. 1;

FIG. 6 is a top view showing a hemispherical protrusion 8 provided on a flange 3 of a reel cassette according to a second embodiment of the present invention.

FIG. 7 is a sectional view of the flange 3 in FIG.

FIG. 8 is a perspective view showing a ridge portion 11 provided on a flange 3 of a reel cassette according to a third embodiment of the present invention.

FIG. 9 is a sectional view of a conventional reel cassette in which a tape reel is inclined.

FIG. 10 is an enlarged cross-sectional view showing a contact portion between an inner surface of the cassette half 22 and a corner 26b at an outer peripheral end of the flange 26 in FIG.

FIG. 11 is a cross-sectional view of a conventional reel cassette in which a tape reel does not tilt.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cassette case, 1a ... Hub receiver, 1b ... Circular end surface, 2 ... Reel hub, 2a ... Central concave part, 2b ... Circular bottom, 3 ... Flange, 3a ... Tape remaining amount display window hole, 3b
... outer peripheral surface, 3c ... corner, 4 ... cassette half, 6
... tape reel, 8 ... hemispherical convex part, 10 ... clearance, 11 ... convex ridge part, 13 ... annular rib

Continued on the front page (72) Inventor Takuo Kikuchi 130 Toyoko-machi, Toyosato-cho, Tome-gun, Miyagi Prefecture Inside Sony Toyosato Co., Ltd.

Claims (4)

[Claims] 1. A reel cassette having a structure in which two tape reels having a pair of flanges on both sides of a reel hub are rotatably juxtaposed in a cassette case comprising a pair of cassette halves formed of synthetic resin. A reel cassette, comprising: a contact projection that projects toward the inner surface of the cassette half and has a semicircular cross section, provided on the outer surface of the outer peripheral portion of the flange that faces the inner surface of the cassette half. 2. The method according to claim 1, wherein the contact convex portion is formed by a circumferentially continuous annular rib having a semicircular cross section on the outer peripheral surface of the flange. Reel cassette. 3. The reel according to claim 1, wherein hemispherical protrusions are formed at a plurality of locations on the outer peripheral surface of the flange at circumferentially spaced intervals as the contact protrusions. cassette. 4. The method according to claim 1, wherein the contact protrusion is formed by a plurality of protrusions having a semicircular cross-section extending radially outward from a center side of the outer surface of the flange. Item 2. The reel cassette according to Item 1.