JP2531508Y2 - Tape cassette - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a tape cassette,
More specifically, the present invention relates to a tape cassette that facilitates assembly.

[0002]

2. Description of the Related Art In a tape cassette, a slider slidably provided over a lower half of a cassette body containing a magnetic tape, a lock piece of the slider slidably provided on the lower half surface, and a lock piece thereof Is provided with a lock coil spring that presses the spring.

[0003] For example, as shown in FIG.
The slider 74 covering the outer surface 70a of the slider 74 slides in the direction of arrow A, and lock pieces 72, 72 of the slider 74 are provided on the lower half 70 so as to be able to protrude and retract, and the slider 74 is moved by the lock pieces 72, 72. Lock hole 7 for slider
Locked at 6, 76, 76, 76. Further, a coil spring 78 as shown in FIG.
Is provided, and the coil spring 78 is attached to the slider 7.
The lock piece 72 is pressed from the opposite side to the lock piece 72.

[0004]

However, the above-described coil spring 78 used in a conventional tape cassette is used.
Is a fine assembly member.
8 may be entangled with each other. That is, as shown in FIG. 4, a part 78a, 78b of the spring 78 enters the gaps 80a, 80b between the wires of the other spring 78 and becomes entangled. For this reason, handling of the coil spring 78 in automatic assembly or manual assembly is extremely difficult,
This reduced the efficiency of tape cassette assembly. In particular, there is a problem that the end portion 78a of the coil spring 78 immediately enters the gaps 80a and 80b between the other spring wires.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a tape cassette in which the handling of a coil spring for a slider lock mounted in the cassette is facilitated and the assembling efficiency is improved.

[0006]

According to the present invention, there is provided a slider slidably provided over a lower half of a cassette body containing a magnetic tape, a lock piece of the slider slidably provided on the lower half surface, and In a tape cassette provided with a slider locking coil spring for pressing the lock piece, the coil spring is formed so as to have a large pitch area and a small pitch area, and the small pitch area is formed at least at both ends of the spring. And, while making the width of the small pitch portion region larger than the gap between adjacent spring wires in the large pitch portion region,
This is achieved by providing a tape cassette characterized in that the gap between adjacent spring wires in the small pitch region is smaller than the diameter of the spring wires.

[0007]

According to the tape cassette of the present invention, at least the ends of the coil springs are in the small pitch region, so that they do not become entangled with the large pitch regions of other coil springs. In addition, the wires of the other coil springs do not enter the small pitch region and become entangled with each other. For this reason, at the time of assembling, it is difficult for the fine coil springs for the slider lock to be entangled with each other.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a tape cassette according to the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of the tape cassette according to the present invention. FIG. 1 is a sectional view of a main part of a portion of the tape cassette according to the embodiment where a lock piece of a slider is provided. It is a front view of the coil spring used for the Example shown in FIG.

In the tape cassette according to the present embodiment, as shown in FIG. 1, a slider 4 slidably provided so as to cover a lower half 2 of a cassette body 1 containing a magnetic tape, and protrudes and sinks into the lower half 2 surface. Locking piece 6 of the slider 4 provided so as to be able to be provided (in the direction of the arrow in FIG. 1) and the locking piece 6
The structure provided with the slider lock coil spring 8 for pressing is the same as that of a known tape cassette.

In the tape cassette according to the present embodiment, as shown in FIG. 2, the coil spring 8 is formed so as to form a large pitch region 10 and a small pitch region 11. 11 are formed at least at both ends 8a and 8b of the spring, and the width W of the small pitch portion region 11 is made larger than the gap L between adjacent spring wires in the large pitch portion region 10 and the small pitch portion region 11 That is, the gap m between the adjacent spring wires is smaller than the diameter R of the spring wire.

The present embodiment will be further described. As shown in FIG. 2, in the coil spring 8, a small pitch portion region 11 having a dense pitch, that is, a small pitch is formed at both ends and a predetermined intermediate portion. The part of the spring 8 is
It is formed at a normal pitch, that is, a large pitch region 10 having a larger pitch than the small pitch region 11. The relationship between the width W of the small pitch portion region 11 and the gap L so that the tip portion or the like as the small pitch portion region 11 does not enter the gap L between the adjacent spring wires in the large pitch portion region and become entangled. Is W> L. Further, the relationship between the diameter R of the spring wire and the gap m is R> m so that the spring wire does not enter the gap m between the adjacent spring wires in the small pitch portion region 11 and is not entangled. .

In the tape cassette of the present embodiment configured as described above, the ends 8a and 8b and the intermediate portion of the coil spring 8 formed in the small pitch region enter the other coil spring 8. And the wire itself of the coil spring 8 is in the small pitch region 11
You don't even get into it. For this reason, the coil springs 8 as fine assembly members do not become entangled with each other and handling thereof does not become difficult, and the assembly efficiency of the tape cassette does not decrease.

Further, the coil spring 8 is usually longer than the surrounding wall at the time of automatic assembly. For this reason, if the spring 8 is made longer by simply increasing the large pitch region 10 which is a normal pitch portion, there is a problem that the elastic urging force becomes too strong. However, when the small pitch region 11 is provided at a predetermined location as described above, the length of the spring 8 can be increased in the small pitch region 11 and the elastic biasing force can be increased without excessively increasing the elastic urging force.

In the above embodiment, it is most preferable that the small pitch region 11 of the coil spring 8 is provided in the middle other than the end portions 8a and 8b. Even when the partial region 11 was provided, it was sufficiently observed that the entanglement between the springs 8 was prevented.

[0015]

According to the present invention, the tape cassette according to the present invention can easily handle the coil spring for the slider lock mounted in the cassette, and can increase the assembling efficiency.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part near a lock piece of a tape cassette according to an embodiment.

FIG. 2 is a front view of a coil spring used in FIG.

FIG. 3 is a rear view of the tape cassette.

FIG. 4 is a front view of a coil spring used in a conventional tape cassette.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cassette main body 2 Lower half 4 Slider 6 Lock piece 8 Coil spring 10 Upper half

Claims (1)

(57) [Scope of request for utility model registration] 1. A slider slidably provided over a lower half of a cassette body containing a magnetic tape, a lock piece of the slider slidably provided on the lower half surface, and a slider lock for pressing the lock piece. A tape cassette provided with a coil spring for use in a tape cassette, wherein the coil spring is formed so as to have a large pitch region and a small pitch region, and the small pitch region is formed at least at both ends of the spring. Characterized in that the width of the tape cassette is larger than the gap between adjacent spring wires in the large pitch region, and the gap between adjacent spring wires in the small pitch region is smaller than the diameter of the spring wire.