JPS593424Y2 - magnetic tape cartridge - Google Patents

Description

[Detailed description of the invention] The invention consists of a case body that houses a reel for winding magnetic tape, which is made up of an upper case and a lower case, and a rotating lid that opens and closes the tape outlet provided in the case body. The present invention relates to a magnetic tape cartridge.

1 and 2 are a perspective view and a plan view of this type of magnetic tape cartridge with the upper case removed.

A case body 3 is composed of an upper case 1 and a lower case 2,
A pair of reels 5, 5 on which magnetic tape 4 is wound are housed inside the case body 3.

A rotating lid 7 for opening and closing the tape outlet 6 provided in the case body 3 is provided on the front side of the case body 3.
The rotating lid 7 is always elastically biased in the direction of covering the tape outlet 6.

When using the magnetic tape cartridge, the rotary lid 7 is rotated to open the tape outlet 6, and the magnetic tape 4 is pulled out from the tape outlet 6 for recording or reproduction.

After use, the magnetic tape 4 protruding outside is wound into the case body 3 while rotating the reel 5, and the tape outlet 6 is covered with the rotating lid 7.

3 to 6 are diagrams for explaining a conventional magnetic tape cartridge of this type, and FIGS. 3 and 4 are diagrams showing a state in which the rotating lid 7 is temporarily fixed to the upper case 1, The figure is a side view of the case body 3.

The rotating lid 7 includes a front plate 8 for covering the tape outlet 6 of the case body 3, a narrow upper plate 9 connected to the upper end of the front plate 8,
Side plates 10A and IOB connected to both ends of the front plate 8, a first rotating shaft 11 protruding from the inside of one side plate 10A, and a second rotating shaft protruding from the inner surface of the other side plate 1OB. It consists of 12.

A spring stopper pin 13 is protruded from the circumferential surface of the second rotation shaft 12, and a coil spring 14 is loosely fitted to the tip of the second rotation shaft 12.
The base end 15 of is locked to the spring stop pin 13.

The free end 16 of the coil spring 14 is elongated, and before the rotating lid 7 is temporarily fixed to the upper case 1, it is locked in a recess 17 formed on the inner surface of the upper plate 9, and both ends are connected to a spring locking pin. The coil spring 14, which is engaged with the coil spring 13 and the recess 17, has appropriate elasticity.

As shown in FIG. 3, a through-hole fitting portion 19 is provided near the front side of one side wall 18A of the upper case 1. As shown in FIG.

When temporarily fixing the rotating lid 7 to the upper case 1, as shown in FIG. Insert it into the joint 19 (in the direction of arrow X).

Next, the second rotation shaft 12 side is brought closer to the upper case 1 with the fitting part 19 as a reference point, and the second rotation shaft 12 is passed over the spring receiver 20 provided on the front inner surface of the upper case 1. Insert the upper plate 9 under the spring receiver 20 (in the direction of arrow Y).

Then, the coil spring 14 that was locked in the recess 17 of the upper plate 9
The free end 16 is separated from the upper plate 9 and slides in elastic contact with the upper surface of the spring receiver 20, and is fitted into a groove-shaped positioning recess 21 provided in the spring receiver 20.

At the same time, the second rotation shaft 12 comes into contact with an arcuate stepped portion 22 provided on the front side of the side wall 18B that faces the side wall 18A having the fitting portion 19.

In this way, the first rotation shaft 11 of the rotation lid 7 is inserted into the fitting part 19 of the upper case 1, while the free end 16 of the coil spring 14 attached to the second rotation shaft 12 is inserted into the upper case 1. The rotating lid 7 is temporarily fixed to the upper case 1 by being brought into elastic contact with the spring receiving portion 20 of the rotary lid 7.

Next, as shown in FIG.
, 5 are attached to the lower case 2, and the upper case 1 described above can be overturned.

As shown in FIGS. 2 and 5, an arc-shaped notch 24 is formed on the front side of one side wall 23B of the lower case 2, and by joining the upper case 1 and the lower case 2, the A through hole 25 is formed by the arcuate stepped portion 22 of the upper case 1 and the arcuate cutout portion 24 of the lower case 2 (see Fig. 5).
.

As mentioned above, since the second rotation shaft 12 is in contact with the stepped portion 22 of the upper case 1, the second rotation shaft 12 is connected to the upper case 1 and the lower case 2 by connecting the upper case 1 and the lower case 2. It is rotatably supported in a through hole 25 formed at the joint portion of the two.

Both cases 1 and 2 are then connected together with screws or the like to complete the assembly of the magnetic tape cartridge.

Due to the coil spring 14 attached to the second rotation shaft 12, the rotation lid 7 always acts in a direction to cover the tape outlet 6 of the case body 3.

However, in this conventional magnetic tape cartridge, when the rotating lid 7 is temporarily attached to the upper case 1, the rotating lid 7 is slightly lifted from the upper case 1 due to the spring elasticity of the coil spring 14, as shown in FIG. become.

Therefore, the rotating lid 7 easily comes off from the upper case 1, resulting in poor assembly efficiency.

In addition, on the magnetic tape cartridge assembly line, the upper case 1 with the rotating lid 7 temporarily attached as shown in FIG. When stopped, only the belt conveyor is in a state of movement, and relative sliding contact occurs between the upper case 1 and the belt conveyor.

At this time, the upper case 1 is slightly lifted off the belt conveyor due to the spring elasticity of the coil spring 14, and the upper plate 9 of the rotating lid 7 comes into sliding contact with the belt conveyor instead.

Therefore, the surface of the top plate 9 is easily damaged, and especially if handling precautions are printed on that surface, the sliding contact with the belt conveyor may cause stains or scratches, making the printing unclear and causing the product to be damaged. value decreases.

The purpose of the present invention is to eliminate such drawbacks of the conventional technology,
To provide a magnetic tape cartridge with good workability during assembly and high commercial value.

In order to achieve this objective, the present invention provides a protrusion, for example, on the side wall or inner surface of the upper case, which prevents the rotating lid from rising due to the spring elasticity of the coil spring loosely fitted to the rotating shaft of the rotating lid. It is characterized by being provided with a floating prevention portion in the shape of a shape or a hook shape.

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 7 and FIG. 8 are diagrams for explaining the first embodiment of the present invention.

One side plate 10 of the rotating lid 7 is similar to the conventional one described above.
A first rotation shaft 11 is provided on the inside of A, and a second rotation shaft 12 is provided on the inside of the other side plate 10B.

A coil spring 14 is loosely fitted to the second rotation shaft 12,
Its base end 15 is locked to the second rotating shaft 12, and its free end 16 is in elastic contact with the inner surface of the upper case 1.

An arcuate step 22 is provided on the front side of the side wall 18B in the upper case 1, and a seventh step 22 is provided below the step 22.
As shown in FIGS. 8 and 8, a protrusion-shaped lifting prevention portion 26 is provided with a space slightly larger than the diameter of the second rotation shaft 12.
is provided to protrude toward the front of the upper case 1.

Therefore, due to the step portion 22 and the lifting prevention portion 26,
A rotation shaft insertion portion 27 is formed which has a U-shaped side surface and is open toward the front of the upper case 1.

When temporarily fixing the rotating lid 7 to the upper case 1, the second rotating shaft 12
The base portion (the portion where the coil spring 14 is not loosely fitted) is inserted into the rotation shaft insertion portion 27, and the coil spring 14 is inserted into the rotation shaft insertion portion 27.
The rotating lid 7 that tries to rise due to the spring elasticity of the second
When the rotation shaft 12 comes into contact with the floating portion lifting prevention portion 26, the floating portion is prevented from lifting.

Afterwards, assemble the magnetic tape cart in the usual manner.

Due to the combination of the upper case 1 and the lower case 2, a stopper part 2 formed at the upper end of the side wall 23B of the lower case 2
At B, the opening of the rotation shaft fitting portion 27 of the upper case 1 is closed.

Therefore, the second rotation shaft 12 is rotatably supported between the rotation shaft insertion portion 27 and the stopper portion 28.

Note that the other configurations, functions, etc. of the magnetic tape cartridge are the same as those of the conventional magnetic tape cartridge described above, so a description thereof will be omitted.

FIG. 9 and FIG. 10 are diagrams for explaining a second embodiment of the present invention.

In the case of this embodiment, as shown in FIG. 9, an arcuate stepped portion 22 is provided on the front side of the side wall 18B in the upper case 1, and the circular step portion 22 is provided on the front side of the side wall 23B in the lower case 2, as in the conventional case. Arc-shaped notches 24 facing the arc-shaped step portions 22 are respectively formed.

The second rotation shaft 12 is rotatably supported in the through hole formed by the stepped portion 22 and the cutout portion 24 so as not to rattle.

On the other hand, as shown in FIG. 10, on the inner surface of the upper case 1 and near the stepped portion 22, a hook-shaped lifting prevention portion 26 is provided facing in a direction opposite to the insertion direction of the second rotation shaft 12. It is being

Therefore, when temporarily fixing the rotating lid 7 to the upper case 1, the second rotating shaft 12 is brought into contact with the stepped portion 22 of the upper case 1, and is inserted into the hook-shaped lifting prevention portion 26. ,
This prevents the rotating lid 7 from floating up due to the coil spring 14.

When the assembly of the magnetic tape cartridge is completed, the base of the second rotation shaft 12 is supported between the stepped portion 22 of the upper case 1 and the cutout portion 24 of the lower case 2, and the second rotation shaft 12 There is no rattling.

The present invention has the above-mentioned structure, and the lifting prevention part provided on the upper case prevents the rotating lid from lifting up due to the coil spring, making it easy to assemble the magnetic tape cartridge. It is possible to provide a magnetic tape cartridge with high commercial value without scratches on the top plate of the magnetic tape cartridge.

[Brief explanation of drawings]

Figures 1 and 2 are a perspective view and a plan view of the magnetic tape cartridge with the upper case removed, and Figures 3 and 4 show the rotary lid of a conventional magnetic tape cartridge temporarily attached to the upper case. A plan view and a partially enlarged plan view showing the state; Figure 5 is a side view of the magnetic tape cartridge with the upper case and lower case joined; Figure 6 is a side view of the magnetic tape cartridge with the rotating lid attached to the upper case. 7 and 8 are for explaining the magnetic tape cartridge according to the first embodiment of the present invention, and FIG. 7 is an enlarged side view of the main part of the upper case. ,
Fig. 8 is an enlarged side view of the main part showing the state in which the upper case and lower case are joined, and Figs. 9 and 10 are the second part of the present invention.
Figure 9 is an enlarged side view of the main part showing a state in which the upper case and the lower case are joined, and Fig. 10 is an enlarged sectional view of the main part of the upper case. be. 1...Top case, 2...Bottom case, 3
...Case body, 6...Tape outlet, 7...Rotating lid, 10A, IOB...
Side plate, 11...First rotation axis, 12...
Second rotation axis, 14... Coil spring, 15...
... Base end, 16 ... Free end, 26 ...
- Lifting prevention part.

Claims (1)

[Scope of utility model registration request] It is equipped with a case body consisting of an upper case and a lower case, and a rotating lid that opens and closes the tape drawer opening of the case body. A moving shaft is rotatably supported in the front part of the case body,
The proximal end of a coil spring that is loosely fitted to the rotation shaft is locked to the rotation shaft, and the free end of the coil spring is brought into elastic contact with the inner surface of the upper case, and the elasticity of the coil and spring causes the rotation lid to be pulled by the tape. In the magnetic tape cartridge biased in a direction to cover the outlet, a lifting prevention part having a fitting part slightly larger than the diameter of the rotating shaft and opening toward the front of the upper case is provided in the upper case, and The rotating lid is configured to prevent lifting of the rotating lid due to the elasticity of the coil spring when the upper case is temporarily fixed by fitting a part of the rotating shaft into the lifting prevention portion. magnetic tape cartridge.