JPS6182395A - Manufacture of shutter for disk cassette - Google Patents

Abstract

PURPOSE:To prevent to caulk simultaneously a peripheral part and to prevent to slide to a cassette case at the tongue piece peripheral part, when a protruded part is formed at the tip of the tongue piece by making sufficiently longer the length of the tongue piece of the shutter which is guided to the groove of the cassette case and opens and closes a head inserting hole. CONSTITUTION:The sufficiently long tongue piece 35, etc., are formed at a shutter 33 which opens and closes the head inserting hole, the top of the tongue piece 35 is bent by caulking of a tool 24 and a protruded part 18, which is guided to the groove 32 of a cassette 2, is prepared. Then, since the tongue 35 is sufficiently long, the peripheral part will not be simultaneously caulked, a sliding to the case 3 of the tongue piece 35 is prevented and the shutter with a good sliding characteristic can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a method for opening and closing the head insertion hole of the cassette casing by guiding a protrusion through a groove formed in the cassette casing. The present invention relates to a method of manufacturing a disk cassette shutter that is slidably attached to a cassette housing.

BACKGROUND ART FIGS. 7 to 11 show conventional examples of the above-mentioned disk cassette. As shown in FIG. 7, inside the synthetic resin cassette housing 2 of this disk cassette 1, there is a disk 3 which is a recording medium made of a magnetic sheet.
is rotatably stored. Concave portions 5 and 6 are formed on both sides of the cassette housing 2 near one end surface 4, and a head insertion hole 7 and a pad insertion hole 8 are formed in these four portions 5 and 6 so as to face each other. There is.

On the other hand, a shutter 11 made of stainless steel, aluminum, etc. and having a U-shaped cross section is attached to the cassette housing 2 so as to straddle one end surface 4 and fit into the recesses 5 and 6.

The shutter 11 includes a pair of facing pieces 12 facing each other.
．． 13, and a connecting piece 14 connecting these facing pieces 12, 13. Two protrusions 17 and 18 are formed on one of the facing pieces 12 at a position close to the connecting piece 14 by bending short tongue pieces 15 and 16 near their base ends toward the other facing piece 13. It is formed. Furthermore, a window hole 21.22 corresponding to the insertion hole 7.8 is formed in the opposing piece 12.13.

A groove 23 parallel to one end surface is formed in the heather at a position close to one end surface 4 of the four parts 5 of the cassette 14ft body 2. It fits into the groove 23. Due to the projections 17.18 being guided in the grooves 23, the shutter 11 is therefore free to slide linearly in the recess 5.6 parallel to the end face 4.

In order to prevent the shutter 11 from easily separating from the cassette housing 2, after the projections 17 and 18 are fitted into the grooves 23, the caulking tool 24 is inserted as shown in FIGS. 8 and 9.
The tongue pieces 15 and 16 are caulked by.

The connecting piece 14 of the shutter 11 has an opposing piece 12.1.
A protruding portion 25 is formed which is bent toward the third space, and a linear spring 26 is locked between this protruding portion 25 and the cassette if body 2.

Therefore, due to the biasing force of the linear spring 26, the tenth
As shown in the figure, one end surface of the shutter 11 is slid to a position where it abuts one wall surface 5a, 5a of the recess 5.6, and the insertion holes 7.8 are respectively closed by the opposing pieces 12.13. There is. Then, the first line resists the biasing force of the second line.
When the shutter 11 is slid to the position shown in FIG. 1, the window holes 21, 22 overlap the insertion holes 7.8, respectively, and these insertion holes 7.8 are opened.

According to the disk cassette 1 as described above, the head insertion hole T and the pad insertion hole 8 are provided when the disk cassette 1 is not in use except for recording and reproduction.
can be closed by the shutter 11, so that foreign objects, dust, etc. can enter the cassette housing 2 through these insertion holes 7, 8, and adhere to the disk 3, causing problems in recording and playback. things will be prevented.

Problems to be Solved by the Invention However, in the shutter 11 of the conventional disk cassette 1 as described above, since the tongue pieces 15.16 are short, protrusions 17.18 extend from the proximal ends of these tongue pieces 15.16. The distance is also short. For this purpose, when the tongues 15 and 16 are caulked as shown in FIGS. 8 and 9, not only these tongues 15 and 16 but also their surroundings are caulked at the same time to the shuttle shown in FIG. Put it away. As a result, when the shutter 11 is slid, not only the tongue piece 151.16 but also its peripheral portion slides against the cassette housing 2, resulting in poor sliding performance of the shutter 11.

Means for Solving the Problems The method of manufacturing a shutter for a disc cassette according to the present invention provides a method for manufacturing a shutter for a disk cassette, in which the tongue piece 34 is sufficiently long compared to the length of the protrusion 17.1B.
．． 35 into the shutter 33, and the step of forming the tongue piece 34.
．． 35 to form the projections 17 and 18, respectively.

Operation The method for manufacturing a disk cassette shutter according to the present invention is such that the tongue piece 34 is sufficiently long compared to the length of the protrusion 17.18.
．． Since the distal ends of the tongues 34 and 35 are bent to form the protrusions 17 and 18, the distance between the proximal ends of the tongues 34 and 35 and the protrusions 17 and 18 is long.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 6.

FIG. 15 shows a disk cassette with a shutter manufactured according to this example. In this disk cassette 31, the grooves 32 are formed until they reach both wall surfaces 5a and 5b of the recess 5 of the cassette housing 2, and the protrusions 17 and 18 guided in the grooves 32 are formed on the shutter 33. Substantially the same as the disk cassette 1 of the conventional example described above, except that it is formed by bending the tips of the tongue pieces 34.35, which are sufficiently long compared to the length of the projections 17.18 at both ends. It may have a similar configuration.

In order to manufacture the shutter 33, in non-embodiment A, as shown in FIG. .34.3 tongue that is sufficiently long compared to the length of .18.
5 was formed. Next, as shown in FIG. 3A-0, the edges of the punched portion of the plate-shaped body 36 were pressed from above and below to remove the edges of the punched portion.

Next, bend the tips of the tongue pieces 34 and 35 to form the protrusion 17.
1B was formed, but the bending angle at this time was slightly smaller than the right angle, as shown by the dashed line in FIG. Then, the plate-like body 36 is bent into a U-shaped cross section and the shutter 33 is
Then, after fitting the projections 17 and 18 into the grooves 32 and attaching the shutter 33 to the cassette housing 2, the tongue pieces 34.
35 was caulked.

In the shutter 33 manufactured according to this embodiment as described above, since the tongue pieces 34.35 are sufficiently long compared to the length of the protrusion 17.18, the proximal ends of the tongue pieces 34.35 and the protrusion The distance between parts 17 and 18 is also long. For this purpose, the fourth
Even if the tongue pieces 34 and 35 are caulked as shown in the figure and Fig. 5,
As shown in FIG. 6, only these tongues 34 and 35 are caulked, and the surrounding areas are not caulked at the same time.

Therefore, when the shutter 33 is slid, the tongue piece 34.3
The peripheral portion of the shutter 33 does not come into sliding contact with the cassette housing 2, and the sliding property of the shutter 33 is good.

Further, as described above, the bending angle when the protrusions 17 and 18 are formed by bending the tips of the tongues 34 and 35 is slightly smaller than a right angle. For this purpose, shutter 3
3 to the cassette housing 2 is easy.
When 35 is caulked, the protrusion 17.1 appears as shown in Fig. 5.
8 is substantially perpendicular to the opposing piece 12, and these protrusions 1γ and 18 fit accurately into the grooves 32, so that the shutter 3
3 has even better sliding properties.

Further, since the punched portion of the plate-shaped body 36 for the shutter 33 is removed, no burrs remain on the plate-shaped body 36. Therefore, the inward facing edges may come into sliding contact with the cassette housing 2, or this sliding contact may scrape the synthetic resin cassette housing 2 and generate powder, and furthermore, the outward facing edges may injure fingers, etc. There's no danger. For this reason, the shutter 33 has good sliding properties, sufficient dustproofing effect, and is safe to handle.

In addition, since the protrusions 1γ and 18 are formed at both ends of the shutter 33, the shutter 33 is slid and the side end surface of the shutter 33 is brought into contact with the wall surface 5a, 13a or 5b%6b of the recess 5.6. When the protrusion 17.1B is fitted into the groove 32, one end surface of the protrusion 17.1B also comes into contact with the wall surface 5assb. For this reason, even if the dimensions between the facing pieces 12 and 13 are large, the wall surface of the shutter 33 5a% 6as 5
There is little risk of overcoming hs 5b and not being able to perform normal opening/closing operations. Moreover, the side end surface of the shutter 33 and the wall surface 5
Since there is no gap between a16a% 5b and 6b, the appearance does not deteriorate.

Effects of the Invention As described above, in the method for manufacturing a disk cassette shutter according to the present invention, since the distance between the proximal end of the tongue and the protrusion is long, even when the tongue is caulked, the surrounding area is not caulked at the same time. The surrounding area of the tongue does not get stuck.
Since the shutter does not come into sliding contact with the body, it is possible to provide a shutter with good sliding properties.

[Brief explanation of drawings]

FIG. 1 is a plan view showing a part of a disk cassette having a shutter manufactured according to an embodiment of the present invention, and FIGS.
FIG. 4 is a plan view, a side sectional view, and a plan view showing the steps of one embodiment, and FIGS. 5 and 6 are respectively shown in FIG.
FIG. FIG. 7 is a perspective view of a disk cassette with a shutter manufactured according to a conventional example of the present invention, FIG. 8 is a plan view showing one process of the conventional example, and FIG. 10 and 11 are plan views showing how the head insertion hole is opened and closed by sliding of the shutter, and FIG. 12 is a sectional view taken along the line XII-X-- of FIG. 8. In addition, in the symbols used in the drawings, 2...Cassette housing 7...
......Head insertion hole 17.18...
・・・・・・Protrusion 31 ・・・・・・・・・Disc cassette 3
2......Groove 33...Shutter 34.35...
・・・・・・It is a piece of tongue.

Claims (1)

[Claims] A disc cassette shutter that is slidably attached to the cassette casing so that the head insertion hole of the cassette casing is opened and closed by a projection being guided through a groove formed in the cassette casing. The manufacturing method includes the steps of forming a tongue on the shutter that is sufficiently long compared to the length of the protrusion, and forming the protrusion by bending the tip of the tongue. A method for manufacturing a shutter for a disk cassette, characterized by: