JPH0413812Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a magnetic tape cassette in which a pair of hubs wound with magnetic tape are rotatably mounted in a box-shaped case. This invention relates to a magnetic tape cassette equipped with a slider for opening and closing the magnetic tape cassette.

[Prior Art] As an example of a magnetic tape cassette, the structure of a digital audio tape cassette is shown in FIG.

By assembling the upper shell 1 and the lower shell 2, a box-shaped case is formed, in which a pair of hubs 3 around which magnetic tape 10 is wound are rotatably supported. A slider 4 that slides back and forth is attached to the lower shell 2, and its hub hole 9 allows
The hub receiving hole 5 of the lower shell 2 supporting the hub 3 is opened and closed.

This slider 4 is moved between the hub receiving hole 5 and the hub hole 9 by the stoppers 6 provided on both sides of the lower shell 2, and the hub receiving hole 5 and the hub hole 5 are positioned at the front side where the hub receiving hole 5 and the hub hole 9 are closed. It is stopped at a position on the rear side where the hub receiving hole 5 is aligned with the hole 9 and the hub receiving hole 5 is opened. The spring 8 protruding from the lower shell 2 is attached to the spring receiving panel 7 protruding from the center of the front part of the slider 4.
The tip of the slider hits the slider 4, and its elasticity pushes the slider 4 forward, acting in the direction in which the hub receiving hole 5 of the lower shell 2 is closed.

In this magnetic tape cassette, the slider 4 is slidably assembled into the lower shell 2 in advance, and then
A hub 3 is inserted between the lower shell 2 and the upper shell 1, and these are stacked on top of each other to form a box shape. When combining the upper and lower shells 1 and 2, the slider 4 is fixed at a position on the rear side of the lower shell 2, the hub receiving hole 5 is opened, a spindle (not shown) is inserted therein, and the hub 3 is Fit the upper shell 1 into the lower shell 2 while fixing it so that it does not shift. The shells 1 and 2 are assembled by sequentially assembling a plurality of shells using an automatic assembly device.

[Problems to be solved by the invention] However, in the conventional magnetic tape cassette, the stopper 6 of the slider 4 sometimes
may come off and the slider 4 may be pushed forward by the elasticity of the spring 8, causing the hub receiving hole 5 to close unexpectedly. If this happens, the spindle that is supposed to be inserted into the lower shell 2 from the hub receiving hole 5 will hit the slider 4 and will not be inserted, causing problems such as stopping the automatic assembly line and even damaging the lower shell 2. invite

The object of the present invention is to solve the above-mentioned problems in conventional magnetic tape cassettes.

[Means for solving the problem] That is, in the present invention, in order to achieve the above object, a box-shaped case is formed by the upper shell 11 and the lower shell 12, and the magnetic tape 20 is wound inside the case. A pair of hubs 13 are rotatably mounted, and the lower shell 12 is provided with a slider 14 that slides back and forth and opens and closes a hub receiving hole 15 that supports the hubs.
In a magnetic tape cassette in which a spring 18 which receives a reaction force from the spring receiving panel 17 provided on the slider 14 and is elastically biased in the direction in which the hub receiving hole 15 closes is engaged, the spring receiving panel 17
A rib 21 extending in the width direction of the slider is provided protrudingly on the slider.
A spring 1 is installed between the rib 21 and the bottom surface of the slider 14.
It is characterized by winning an 8.

[Function] In the magnetic tape cassette according to the present invention, as shown in FIG.
1 and the bottom surface of the slider 14, and as shown in FIGS. 3 and 4, the slider 14
As the rib 2 slides back and forth, the rib 2 slides back and forth, as shown by reference numerals 18a and 18b in FIG.
Slide below 1.

Therefore, when assembling the lower shell 12 and the upper shell 11, the vertical movement of the intermediate portion relative to the lower shell 12 is restricted via the spring 18, and the deflection of the slider 14 is suppressed. Therefore, the stopper 16 comes off and the slider 14 is prevented from being pushed out unexpectedly.

[Examples] Next, examples and preferred embodiments of the present invention will be described with reference to the drawings.

A slider 14 that slides back and forth is attached to the lower shell 12 that forms the lower half of the outer shell of the magnetic tape cassette, and its hub hole 19 opens and closes the hub receiving hole 15 of the lower shell 12 that supports the hub 13. be done.

The slider 14 is arranged so that the hub receiving hole 15 and the hub hole 19 are deviated by stoppers 16 provided on both sides of the lower shell 12, and the hub receiving hole 15 and the hub are placed in a front position where the hub receiving hole 15 and the hub hole 19 are closed. It matches the hole 19 and is stopped at the rear side where the hub receiving hole 15 is opened. Then, the spring 18 protruding from the lower shell 12 hits the spring receiving panel 17 protruding from the center of the front part of the slider 14, and the spring 18 is applied to the slider 14.
acts in the direction of pushing forward.

In the present invention, in such a magnetic tape cassette, a rib 21 extending in the width direction of the spring receiving panel 17 is provided projectingly, and the tip of the spring 18 is placed between the rib 21 and the bottom surface of the slider 14.

In the illustrated embodiment, a leaf spring bent in a dogleg shape is used as the spring 18, and the central bending point is a spring support pin 2 protruding from the lower shell 12.
It is held at 3. The spring receiving panel 17 is provided with a pair of ribs 21 symmetrically corresponding to both ends of the spring 18, and the ribs 21 and the slider 14
The tip of the spring 18 is in contact with the bottom surface of the spring 18.

The illustrated rib 21 has a long distance from the bottom surface of the slider 14 at the center of the spring receiving panel 17;
A slope is formed such that the distance becomes closer to both sides of the panel 17. Then, the rib 21 and the slider 1 at the most side parts
4 and the bottom surface is set slightly wider than the width of the spring 18.

As shown in FIGS. 3 and 4, as the slider slides back and forth on the lower shell 12, the spring 1
The tips of 8 slide under the ribs 21, as shown by reference numerals 18a and 18b, respectively, in FIG. In this case, the tip of the spring 18 is connected to the spring receiver panel 1.
7, that is, when the slider 14 is slid to the rear of the lower shell 12 as shown in FIG. I'm squeezed in with no room to spare. As a result, the deflection of the slider 14 is almost completely suppressed. On the other hand, when the tip of the spring 18 slides toward the center of the spring receiver panel 17, that is, when the slider 14 slides toward the front of the lower shell 12 as shown in FIG. The spring 1 between
The tip of No. 8 has a certain amount of leeway. This ensures smooth sliding of the slider 14.

Of course, it is also possible to arrange the ribs 21 parallel to the bottom surface of the slider 14 without forming such a slope.

In the above embodiments, a leaf spring is used as the spring 18, but even if a wound spring or a coil spring is used, the present invention can be applied in the same manner by simply changing the position and shape of the spring stop 21 accordingly. It goes without saying that this can be done.

[Effects of the invention] As explained above, according to the invention, the relative movement in the vertical direction between the lower shell 12 and the slider 14 is regulated by the spring 18, and the deflection of the slider 14 is suppressed. During assembly, the stopper 16 is prevented from accidentally coming off, the slider 14 is pushed out, and the hub receiving hole 15 of the lower shell 12 is prevented from closing. Therefore, troubles such as damage to the lower shell 12 due to the spindle and stoppage of the assembly line can be prevented.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of the lower shell and slider of a magnetic tape cassette showing an embodiment of the present invention, Fig. 2 is a rear view showing the position where the tip of the spring hits the spring receiving panel of the slider, and Figs. FIG. 4 is a bottom view of the lower shell of the magnetic tape cassette with the slider 14 seen through, and FIG. 5 is a perspective view of a conventional magnetic tape cassette seen from the bottom side. 11...Upper shell, 12...Lower shell, 13...
...Hub, 14...Slider, 15...Hub receiving hole,
17...Spring receiving panel, 18...Spring, 20...
Magnetic tape.

Claims (1)

[Claims for Utility Model Registration] (1) An upper shell and a lower shell form a box-shaped case, and a pair of hubs wrapped with magnetic tape are rotatably attached to the case, and The shell 12 is a slider 1 that opens and closes a hub receiving hole 15 that supports a hub by sliding back and forth.
4, and a spring 18 which receives a reaction force from the spring receiving panel 17 and is elastically biased in a direction in which the hub receiving hole 15 closes is engaged with the spring receiving panel 17 provided on the slider 14. A magnetic tape cassette characterized in that a spring receiving panel 17 is provided with a rib 21 extending in the width direction thereof, and a spring 18 is applied between the rib 21 and the bottom surface of the slider 14. (2) Rib 21 in Claim 1
The magnetic tape cassette has a slope such that the distance from the bottom surface gradually decreases from the center of the spring receiver panel 17 to both sides thereof.