JPH0441503Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a window member for a see-through window of a magnetic tape cassette used in a tape deck of a VTR or the like.

[Conventional technology]

In a magnetic tape cassette, a see-through window is provided in the upper half of the cassette body, which houses the supply and take-up reels, for checking the amount of winding of the magnetic tape.

To explain this with reference to FIG. 5, a magnetic tape cassette 1 for a VTR has an upper half 2 and a lower half 3.
A supply reel 6 for winding the magnetic tape 5 and a take-up reel 7 are rotatably housed inside the cassette body 4, which consists of A front cover 8 covering the magnetic tape 5 fed out from the cassette body 4 is attached so as to be openable and closable.

There is a recess 2 on the top surface of the upper half 2 for attaching a label.
Transparent windows 9, 9 are provided on the left and right sides of a for visually checking the amount of winding of the magnetic tape 5 wound on both reels 6, 7, and the transparent windows 9 are provided with a transparent window in the opening 2b. It is constructed by attaching a window member 10.

This window member 10 is made of transparent styrene resin or the like, and has a scale 11 protruding from its inner surface to indicate the amount of winding.Before assembly to the upper half 2, as shown in FIG. , a large number of sheets are stacked and stored in the holder 12, and taken out one by one from the top or bottom of the holder 12 by chucking,
It is automatically supplied to the opening 2b of the upper half 2 and ultrasonically welded.

However, when this window member 10 is stacked in the holder 12, accuracy errors in the scales 11, patterns, or planes protruding from the inner surface are amplified by stacking in multiple stages, and the window members 10 may be stored at an angle in the holder 12. This is not preferable as it may be difficult to take it out, which may cause chuck errors.

For this reason, four supporting legs are provided protruding from the welding surface of the welding flange formed around the window member, so that even if the window members are stacked in multiple stages during transportation, the surface of the window member The one that prevents the objects from coming into contact with each other and preventing the load from collapsing was developed in 1987-74280.
It is disclosed in the publication No.

[The problem that the idea aims to solve]

However, since this window member has four support leg seats protruding from the welding surface of the welding flange, the welding flange extends beyond the welding flange on the periphery of the opening of the thin upper half. If sonic welding is performed, the part corresponding to the leg seat may become white and deformed, and in extreme cases it may be damaged.Also, if the leg seat is not welded, the part corresponding to the leg seat will be attached to the leg seat around the opening of the upper half. Therefore, the strength of the opening periphery after welding will be reduced.

The present invention was developed against the background of the above circumstances, and is capable of preventing whitening and deformation of the periphery of the opening of the upper half and damage, and also prevents the holder from tilting when stored without reducing the strength of the periphery of the opening after welding. It is an object of the present invention to provide a window member for a see-through window of a magnetic tape cassette, which prevents the above problems and enables smooth automatic feeding.

[Means to solve the problem]

This invention was made in view of the above-mentioned purpose,
A three-point support is provided on either the inner or outer surface of the mask part formed inside the welding flange part of the window member for the see-through window of the magnetic tape cassette that is attached to the opening in the upper half of the cassette body containing the magnetic tape. It is characterized by a protruding leg seat for use.

[Effect]

According to the above configuration, the three-point support leg seat corrects errors in plane accuracy of the window member for a perspective window, prevents direct contact with scales or patterns, and allows the window member for a perspective window to be placed in the holder. Even when stacked in multiple stages, it can be stored without tilting, and automatic feeding can be performed smoothly.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

FIGS. 1 and 2 illustrate an embodiment of the present invention, in which the window member 13 for the see-through window is integrally molded by pressing from a transparent material such as styrene resin, as in the conventional example described above. A mask portion 13b that fits into the opening 2b is formed in a step shape inside a welding flange portion 13a that engages with the inner peripheral edge of the opening 2b of the upper half 2.

On the outer periphery of the mask portion 13b, hemispherical three-point support leg seats 14a, 14b, 14c are protruded at approximately equal positions, and the inner surface has a scale 15 and a supply or take-up reel 6, A pattern 16 in which multiple semicircles are overlapped in multiple stripes covering the center of the pattern 7 is provided protrudingly. Further, the welding flange portion 13a is provided with a plurality of ribs 17 for ultrasonic welding.

The three-point support leg seats 14a, 14b, 14c
is for separating the upper and lower window members 13 when the window members 13 are stacked in the holder 12, and is therefore provided to protrude from the scale 15 and pattern 16 formed on the inner surface of the mask portion 13b. In addition, by using three-point support, the stability during stacking is higher than when supporting with more than three points.In addition, in order to achieve flatness accuracy of the product, the leg seat when forming the mold is There is an advantage that corrections to 14a, 14b, and 14c can be easily performed.

Therefore, the window member 13 of this embodiment is as follows:
The plane accuracy is corrected by the leg seats 14a, 14b, and 14c for three-point support, and the scale 15 and pattern 1
6 can be stacked in multiple stages without tilting in the holder 12, making it easy to take out the parts from the holder 12, ensuring reliable chucking, eliminating mistakes in supplying to the upper half 2, and improving assembly efficiency. can be improved.

FIG. 3 shows a hemispherical three-point support leg seat 14a,
14b and 14c are the mask portion 1 of the window member 13.
In the second embodiment, the window members 13 are provided on the inner surface of the mask part 13b at equal intervals as in the above embodiment, and when the window members 13 are stacked in the holder, the side surfaces 13 of the mask part 13b
Even if one of the leg seats 14a, 14b, 14c is caught and tilts, the leg seats 14a, 14b, 14c of this embodiment are formed into hemispherical curved surfaces as described above. , window member 13
If you push lightly in the direction of arrow A, the mask part 13
The side surface 13c of b is the leg seat 14a, 14b, 14c.
It can be easily placed in a normal state without any inclination by overcoming the curved surface.

Furthermore, if the side surface 13c of the mask portion 13b is tapered as shown, the side surface 13c can more easily climb over the leg seats 14a, 14b, and 14c.

FIG. 4 shows a third embodiment of the present invention, in which a slope 18 is formed on the outer periphery of the tip of a short cylinder on leg seats 14a, 14b, and 14c for three-point support provided on the inner surface of the window member 13. Also in this embodiment, the leg seats 14a, 14b, and 14c allow the window members 13 to be stacked in a state suitable for chucking, and the mask portion 13 can be stacked when the holder is stored.
The side surface 13c of b is the leg seat 14a, 14b, 14c.
Even if you get caught on one of the slopes 18
With this guidance, it is possible to easily climb over the leg seats 14a, 14b, and 14c and arrange them in a normal stacked state.

Note that the shapes of the leg seats 14a, 14b, and 14c of the present invention are not limited to the above embodiments. Further, these locations can be changed as appropriate depending on the shape of the window member.

[Effect of idea]

As explained above, the present invention has a magnetic tape cassette that is attached to either the inner or outer surface of the mask part formed inside the welding flange part of the see-through window window member of the magnetic tape cassette that is attached to the opening of the upper half of the cassette body. , Since the leg seat for three-point support is provided protrudingly, a large number of window members can be stacked inside the holder without tilting, and reliable and stable automatic feeding can be performed to improve assembly efficiency. After the window member is welded to the upper half, the periphery of the opening of the upper half can be prevented from becoming white, deformed or damaged, and the strength of the periphery of the opening after welding is not reduced.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention,
Fig. 1 is a perspective view of the window member, Fig. 2 is a front view of the window member stacked in the holder, Fig. 3 is a front view showing the stacked state of the window member of the second embodiment, and Fig. 4 is the third embodiment. 5 and 6 are front views showing the laminated state of the window member of the embodiment, and FIGS. 5 and 6 show the conventional example. FIG.
The figure is a front view of the window members stacked inside the holder. 1... Magnetic tape cassette, 2... Upper half,
2b...Opening, 3...Lower half, 4...Cassette body, 5...Magnetic tape, 6...Supply reel, 7
... Winding reel, 12 ... Holder, 13 ... Wind member, 13a ... Welding flange part, 13
b...Mask part, 14a, 14b, 14c...3
Leg seat for point support, 15...scale, 16...pattern,
17... Rib for ultrasonic welding.

Claims (1)

[Scope of utility model registration request] In a window member for a see-through window of a magnetic tape cassette that is attached to the opening 2b of the upper half 2 of the cassette body 4 containing the magnetic tape 5, a welding flange portion 13a of the window member 13 for the see-through window is formed inside. Leg seats 14a, 14b, 1 for three-point support are provided on either the inner or outer surface of the mask portion 13b.
A window member for a see-through window of a magnetic tape cassette, characterized in that 4c is provided protrudingly.