JPS6325588Y2 - - 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. This 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, and inside the case body 3 there is a pair of reels 5, 5 on which magnetic tape 4 is wound.
is stored. On the front part of the case body 3,
A rotating lid 7 is provided for opening and closing a tape outlet 6 provided in the case body 3, and the rotating lid 7 is always elastically biased in a direction to cover 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. Reel 5 after use
While rotating, the magnetic tape 4 coming out is wound up into the case body 3, and the tape outlet 6 is covered with a rotating lid 7.

3 to 6 are diagrams for explaining the assembly of this type of magnetic tape cartridge, and FIGS. 3, 4, and 6 show the state in which the rotating lid 7 is temporarily fixed to the upper case 1. The figure shown in FIG. 5 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, and side plates 1 connected to both ends of the front plate 8.
0A, 10B, a first rotation shaft 11 protruding from the inner side of one side plate 10A, and a second rotation shaft 12 protruding from the inner surface of the other side plate 10B. A spring stopper pin 1 is attached to the circumferential surface of the second rotation shaft 12.
3 is provided protrudingly, and the base end 15 of the coil spring 14 loosely fitted to the tip of the second rotation shaft 12 is connected to the spring stop pin 1.
It is locked at 3. Free end 1 of coil spring 14
6 is elongated, and before the rotary lid 7 is temporarily fixed to the upper case 1, there is a recess 1 formed on the inner surface of the upper plate 9.
The coil spring 14, which has both ends locked with the spring stopper pin 13 and the recess 17, has appropriate elasticity.

As shown in Fig. 3, a through-hole-like fitting portion 19 is provided near the front side of one side wall 18A of the upper case 1. When temporarily fixing the rotating cover 7 to the upper case 1, as shown in Fig. 3, first, the rotating cover 7 is tilted relative to the upper case 1, and the tip of the first rotating shaft 11 is inserted into the fitting portion 19 (in the direction of the arrow X). Next, the second rotating shaft 12 is brought close to the upper case 1 using the fitting portion 19 as a base point, and the second rotating shaft 12 is inserted into the upper case 1.
The coil spring 14 is passed over the spring receiving portion 20 provided on the front inner surface of the upper plate 9, and the upper plate 9 is inserted under the spring receiving portion 20 (in the direction of the arrow Y). Then, the free end 16 of the coil spring 14 that was engaged in the recess 17 of the upper plate 9 leaves the upper plate 9 and slides while elastically contacting the upper surface of the spring receiving portion 20.
It fits into a groove-shaped positioning recess 21 provided in the spring receiving portion 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 second rotation shaft 1
Free end 16 of coil spring 14 attached to 2
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 upper case 1.

Next, as shown in FIG. 2, a magnetic tape 4 and a pair of reels 5, 5 are attached to the lower case 2.
The above-mentioned upper case 1 can be reversed. Figures 2 and 5
As shown in the figure, an arc-shaped notch 24 is formed on the front side of one side wall 23B of the lower case 2.
By joining the upper case 1 and the lower case 2, a through hole 25 is formed between the arcuate stepped portion 22 of the upper case 1 and the arcuate notch 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,
2 are then connected together with screws etc.
Complete assembly of magnetic tape cartridge.

A coil spring 14 attached to the second rotation shaft 12 allows the rotation lid 7 to open at the tape outlet 6 of the case body 3.
It always acts in the direction of covering the area.

7 is an enlarged perspective view of the vicinity of the spring receiving portion 20 in a conventional magnetic tape cartridge. A shallow groove-like positioning recess 21 extending slightly from the front side to the back side is formed in the spring receiving portion 20 on the inner surface of the upper case 1. Between this positioning recess 21 and a partition wall 26 erected slightly toward the center, an inclined guide portion 27 is provided which gradually becomes lower from the partition wall 26 toward the positioning recess 21 side.

This inclined guide portion 27 is connected to the free end of the coil spring 14 that is separated from the upper plate 9 of the rotary lid 7 when the rotary lid 7 is temporarily fixed to the upper case 1 as shown in FIG.
6 functions as a guide until it is inserted into the positioning recess 21 of the upper case 1.

This inclined guide part 27 is provided near the positioning recess 21, but the root part of the inclined guide part 27 on the positioning recess 21 side only reaches the upper surface of the spring receiving part 20, and the root part and the positioning recess 21
There is a step 28 between the bottom surface and the bottom surface like the other parts.

In a conventional magnetic tape cartridge having such a design, when temporarily fixing the rotating lid 7 to the upper case 1, the free end 16 of the coil spring 14 may not be completely guided to the bottom of the positioning recess 21. . If this happens, the temporary fixing of the rotating lid 7 will become unstable, and if it is too severe, the coil spring 14 may come off and fly off, which is unfavorable in terms of assembly work.

An object of the present invention is to eliminate the drawbacks of the prior art and to provide a magnetic tape cartridge in which the rotating lid can be securely temporarily fixed and the assembly work is easy.

In order to achieve this purpose, the present invention includes a case body consisting of an upper case and a lower case, and a rotating lid for opening and closing the tape outlet of the case body.
A rotating shaft protruding inward is provided on the side plate of the rotating lid, the rotating shaft is rotatably supported on the front part of the case body, and the base end of a coil spring is loosely fitted to the rotating shaft. In a magnetic tape cartridge, the magnetic tape cartridge is locked to a rotating shaft, the free end of a coil spring is brought into elastic contact with the inner surface of the upper case, and the elasticity of the coil spring urges the rotating lid in a direction to cover the tape outlet, forming a positioning recess in the inner surface of the upper case into which the free end of the coil spring is inserted;
The present invention is characterized in that an inclined guide portion is provided in the vicinity of the positioning recess, and is gradually lowered so as to extend to the bottom surface of the positioning recess, and guides the free end of the coil spring to the positioning recess.

Next, an embodiment of the present invention will be described with reference to FIGS. 8 to 10.

FIG. 8 is an enlarged perspective view of the vicinity of the spring receiving part 20 in the magnetic tape cartridge of the present invention, and the difference from the conventional one shown in FIG.
1 and the partition wall 26
The root portion 29 on the positioning recess 21 side reaches the bottom surface 30 of the positioning recess 21 . As shown in FIG. 9, the tip of this root portion 29 extends to approximately the center of the width of the positioning recess 21.

FIG. 10 shows the rotating lid 7 as shown in FIG.
FIG. 3 is a diagram showing the positional relationship between the coil spring 14 and the inclined guide portion 27 in a state where the coil spring 14 is temporarily fixed to the upper case 1. The free end 16 of the coil spring 14 is connected to the inclined guide part 2.
In order to more reliably guide the coil spring 14 into the positioning recess 21 along the slope 7, a bent portion 31 is provided on the free end 16 side of the coil spring 14. Then, this bent portion 31 slides on the slope of the inclined guide portion 27 and uses the elasticity of the coil spring 14 itself to position the positioning recess 2.
In other words, the position of the bent portion 31 is selected such that the bent portion 31 faces the inclined guide portion 27 .

Since the present invention is structured as described above,
The coil spring is smoothly inserted and guided by the inclined guide portion, the rotating lid is always temporarily fixed, and the assembly work efficiency can be improved compared to the conventional one.

[Brief explanation of the drawing]

Figure 1 is an overall perspective view of the magnetic tape cartridge, Figure 2 is a plan view of the magnetic tape cartridge with the upper case removed, Figures 3 and 4.
The figures are a plan view and a partially enlarged plan view showing the rotating lid temporarily attached to the upper case, Figure 5 is a side view of the upper case and lower case joined together, and Figure 6 is a side view of the rotating lid temporarily attached to the upper case. A perspective view showing the state temporarily attached to the upper case,
FIG. 7 is an enlarged perspective view of the vicinity of the spring receiver of a conventional magnetic tape cartridge, FIG. 8 is an enlarged perspective view of the vicinity of the spring receiver of a magnetic tape cartridge according to an embodiment of the present invention, FIGS. FIG. 10 is a partially cutaway front view and a partially cutaway side view of the spring receiving portion. 1... Upper case, 2... Lower case, 3... Case body, 6... Tape outlet, 7... Rotating lid, 1
0A, 10B...Side plate, 12...Second rotation axis, 1
4... Coil spring, 16... Free end of coil spring, 20... Spring receiver, 21... Positioning recess,
27... Inclined guide part, 29... Root part, 30...
Bottom.

Claims (1)

[Scope of utility model registration request] A case body consisting of an upper case and a lower case,
The case body is equipped with a rotating lid that opens and closes the tape outlet, and a rotating shaft that protrudes inward is provided on the side plate of the rotating lid, and the rotating shaft is rotated to the front of the case body. The base end of a coil spring 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 spring allows the rotation lid to be opened. In the magnetic tape cartridge biased in a direction covering the tape outlet, a positioning recess into which the free end of the coil spring is inserted is formed in the inner surface of the upper case, and the positioning recess is gradually lowered so as to extend to the bottom of the positioning recess. 1. A magnetic tape cartridge characterized in that an inclined guide portion for guiding the free end of the coil spring to the positioning recess is provided upright near the positioning recess.