JPH0777064B2 - Tape cartridge - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape cartridge, and more particularly, to a main body case provided with a tape reel lifting control means.

[Conventional technology]

An example of this type of tape cartridge is shown in FIGS. 6 and 7 (Japanese Patent Laid-Open No. 62-270081).
Issue). There, a so-called two-color molding method is used to integrally form a transparent window plate 2 for visually recognizing the tape winding amount on the main body case 1 in order to save the assembling of the window plate 2 and improve the productivity.
Also, a rib for restricting reel floating up is provided on the periphery of the transparent window plate 2.
By projecting 20 integrally, an act of mischieving the user by inserting a finger from the drive shaft insertion hole 21 at the bottom of the main body case 1 and pushing up the tape reel 17 against the reel pressing spring 10 was performed. Also in this case, as shown in FIG. 7, the upper flange 17a of the tape reel 17 contacts the lower end of the rib 20 so that the hub 17b of the reel 17 is completely removed from the drive shaft insertion hole 21 toward the inside of the case. The tape reel 17 is restricted so that it does not get stuck, so that it will not hinder the subsequent mounting on the tape recorder.

[Problems to be Solved by the Invention]

In the above-mentioned conventional example, regarding the cross-sectional shape of the joint surface portion between the transparent window plate 2 and the main body case 1, sufficient consideration is given to the load from the inside of the case applied by the lifting of the tape reel 17 to the window plate 2. However, there is still a problem when the main body case 1 is bent by an external force and is deformed such as twisted.

That is, if the reel floating restriction ribs 20 are provided on the transparent window plate 2 side, the rigidity of the window plate 2 itself is increased, but the rigidity of the window peripheral portion on the main body case 1 side is insufficient, and therefore the main body Due to the external force applied to the case 1, the main body case 1 is likely to be bent and deformed such as twisted,
Due to this deformation, the joint surface portion with the transparent window plate 2 may come off.

Further, when the lifting of the tape reel 17 is regulated, as shown in FIG.
Since it is mounted on the lower end of the reel, the reel pressing spring 10 may be deformed, and thereafter, the spring constant is changed by the deformation and the pressing function of the tape reel 17 is adversely affected.

Therefore, the present invention effectively prevents the joining surface portion of the main body case and the transparent window plate from coming off even when an external force is applied to the main body case in the tape cartridge having the integrally molded window and the reel lifting control means as described above. The purpose is to

Another object of the present invention is to prevent deformation of the reel pressing spring so that the reel pressing function is not adversely affected.

[Means for Solving the Problems]

In order to achieve the above object, in the tape cartridge of the present invention, the reel lifting restriction rib 9 has the transparent window plate 2.
The rib 9 surrounds the peripheral edge 15 of the transparent window plate 2 adjacent to it and projects further downward than the inner surface of the peripheral edge 15 instead of the side. It is integrally molded into.

Further, in the present invention, the reel pressing spring 10 is provided on a part of the rib 9.
The first concave portion 11 is provided to avoid contact interference with the second concave portion, and the second concave portion is provided at a position substantially opposite to the first concave portion 11.
18 is provided.

[Action]

The rib 9 restricts the lifting of the tape reel 17 in the same manner as in the conventional case, and increases the rigidity of the window peripheral portion of the main body case 1.

In addition, the reel retainer spring 10 also escapes into the first recess 11 when restricting the lifting of the reel.

The second provided on the side of the rib 9 facing the first recess 11
The concave portion 18 makes the sliding resistance of the window molding slide core 6 at the time of molding well balanced.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS.

1 and 3, 1 is a main body case as a primary molded product, 2 is a transparent window plate as a secondary molded product, and both are integrally molded by the core back injection molding method as follows. To be done.

In the molding, first, as shown in FIG. 4 (a), the upper and lower molds 3 and 4 are set in the primary molding of the main body case 1. A slide core 6 for forming an oval window hole 5 in the main body case 1 is set in the lower mold 4. Thus,
The primary molding material is injected into the cavities in the upper and lower molds 3 and 4 from the primary molding gate 7 to perform cooling molding.

At this time, since the step drop portion 8 is provided at the upper end of the lower mold 4 on the side facing the slide core 6, the rib 9 having a square cross section is formed on the inner surface of the main body case 1 by the step drop portion 8. It is integrally molded in an oval shape along the circumference.

Further, as shown in FIG. 5, between the sliding surfaces of the lower die 4 and the slide core 6, a guide groove 19a is fitted to the lower die 4, and a groove 22a is fitted to the slide core 6 to the guide rib 19a. Are provided respectively to make the slide core 6 slidable. However, the upper end of the guide ridge 19a extends to the stepped-down portion 8, and the upper end of the guide ridge 19a extending to the stepped-down portion 8 causes the main body case 1 to move as shown in FIG. First recesses 11 are formed flush with the inner surface of the main body case 1 on the left and right sides in front of the rib 9 to avoid contact interference with the reel pressing spring 10 mounted on the inner surface side.

At this time, between the sliding surfaces of the lower die 4 and the slide core 6, a similar guide ridge 19b is provided on the side of the lower die 4 facing the guide ridge 19a, and the slide core 6 has the guide ridge 19b. A groove 22b into which the line 19b is fitted is provided, and thus a second recess 18 is formed in the rib 9 on the rear side facing the first recess 11.

After the primary molding, as shown in FIG. 4 (b), the slide core 6
Retreat to form a cavity for secondary molding with the main body case 1 as a primary molded product. The amount of retreat of the core 6 is set to a stroke in which the step drop portion 12 provided on the upper edge of the core 6 stays at a position higher than the step drop portion 8 of the lower mold 4. At this time, the slide core 6 has the concave grooves 22a, 22b facing each other in the front-rear direction, so that the sliding resistance is balanced under the guidance of the guide ridges 19a, 19b on the lower die 4 side.

Thus, the transparent secondary molding resin is injected from the secondary molding gate 13 to integrally mold the transparent window plate 2 in the window hole 5 of the main body case 1. At this time, the rib 16 is integrally formed on the inner surface of the peripheral edge 15 of the transparent window plate 2 by the step-down portion 12 of the slide core 6. The rib 16 is adjacent to the rib 9 on the main body case 1 side and is surrounded by the rib 9 on the entire circumference, and the rib 9 on the main body case 1 side is located below the inner surface of the rib 16 of the transparent window plate 2. It is molded into a long protruding shape. However, guide ridge 19a
-By 19b, the rib 16 is not formed in the portion corresponding to the recesses 11 and 18 of the transparent window plate 2.

On the inner circumference of the main body case 1 formed in this way, as shown in FIG. 3, a reel pressing spring 10 is attached so as to correspond to the first recess 11, and required parts such as a tape reel 17 are built in. .

According to such a tape cartridge, even if the tape reel 17 is pushed upwards against the reel pressing spring 10 by a finger as described above, the second
As shown in the figure, the upper flange 17a of the tape reel 17 contacts the rib 9 on the case side, thereby restricting the reel 17 from floating upward. At this time, since the reel pressing spring 10 escapes into the first recess 11, the spring 10 is not deformed.

Moreover, since the rib 9 on the main body case side increases the strength of the peripheral edge of the window hole 5, even if an external force such as bending or twisting is applied to the main body case 1, the deformation at the peripheral edge of the window hole becomes as small as possible, and the external force is reduced. It is difficult to transmit to the transparent window plate 2 and is effective in preventing the joint surface portion with the transparent window plate 2 from coming off. Particularly, since the rib 9 is formed not only adjacent to and surrounding the peripheral edge of the transparent window plate 2 but also protruding downward from the inner surface thereof, the reinforcing function of the peripheral edge of the window hole 5 is sufficient. Also, the effect of blocking the transmission of the external force to the transparent window plate 2 is greatly enhanced.

Further, since the window hole 5 of the main body case 1 is formed in an oval shape that is long in the left-right direction of the main body case 1 and the rib 9 is provided substantially continuously over the entire circumference thereof, the peripheral edge of the window hole of the main body case 1 is The rigidity is significantly improved.

[Another embodiment]

In the above-described embodiment, the second recess 18 facing the first recess 11 is single in the reel lifting restriction rib 9, but two or more second recesses 18 are provided according to the number of the first recesses 11. May be. Here, the fact that the first concave portion 11 and the second concave portion 18 face each other means that the sliding resistance of the slide core 6 is balanced, and does not mean that the first concave portion 11 and the second concave portion 18 face each other in terms of position.

〔The invention's effect〕

As described above, according to the tape cartridge of the present invention, the rib 9 for restricting the reel lifting is formed in the main body case 1.
Since the peripheral edge 15 of the transparent window plate 2 is surrounded by the inner surface of the side adjacent to the inner peripheral surface of the transparent window board 2 and protrudes further downward than the inner surface of the peripheral edge 15, the floating of the tape reel 17 can be restricted. Even if an external force such as bending or twisting is applied to the main body case 1, the detachment of the joint surface portion with the transparent window plate 2 can be prevented very effectively and reliably, which is advantageous.

Moreover, in the present invention, a reel pressing spring is provided on a part of the rib 9.
Since the first recess 11 is provided to avoid contact interference with 10,
Since the reel pressing spring 10 is not deformed when the reel is not lifted, the reel pressing function can be always exerted with an appropriate spring pressure. Further, since the reel lift-up restricting rib 9 is provided with a second recess 18 opposite to the first recess 11, the sliding core 6 for forming the window is well secured during molding. Therefore, the molding accuracy can be improved.

[Brief description of drawings]

1 to 5 show an embodiment of a tape cartridge according to the present invention. FIG. 1 is an enlarged sectional view of a transparent window plate portion of a main body case, and FIG. 2 shows a state in which a tape reel is lifted. 1 is a cross-sectional view corresponding to FIG. 1, FIG. 3 is an internal plan view of the main body case, and FIGS. 4A and 4B are cross-sectional views of the main body case and a molding die for the transparent window plate, and FIG. FIG. 3 is a perspective view of the mold. 6 and 7 show a conventional tape cartridge. FIG. 6 is an enlarged sectional view of a transparent window plate portion of a main body case, and FIG. 7 shows a state in which a tape reel is lifted up.
It is sectional drawing shown corresponding to a figure. 1 ... Main body case, 2 ... Transparent window plate, 9 ... Rib, 10 ... Reel presser spring, 11 ... First recess, 18 ... Second recess, 15 ... Perimeter of transparent window plate, 17 ... … Tape reel.

Claims (1)

[Claims] 1. A transparent window plate 2 is formed integrally with a main body case 1 containing a tape reel 17, and a rib 9 for restricting reel lifting is formed on the inner surface of the main body case 1 corresponding to the upper side of the tape reel 17. The transparent window plate 2 is integrally molded so as to surround the peripheral edge 15 of the transparent window plate 2 adjacent thereto and project downward from the inner surface of the peripheral edge 15. 1. A tape cartridge comprising a first recess 11 for avoiding contact interference with a mounted reel pressing spring 10 and a second recess 18 opposed to the first recess 11.