JPH0519790B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention has a disk rotatably built into a disk case consisting of an upper and lower case, and a structure made of synthetic resin fiber between the inner surface of the lower case and the disk. The present invention relates to a disk cartridge having a non-woven liner interposed therebetween, in which the shape of the ears for positioning to the lower case provided on the non-woven liner has been improved.

[Conventional technology]

For example, a sixth disk cartridge
There is one shown in the figure (Utility Model Publication No. 63-46934).

There, upper and lower plastic cases 1a,
A disk 2 is rotatably housed in a disk case 1 which is formed by connecting two casings 1a and 1b with their lids together, and a nonwoven fabric liner 3 is interposed between the disk 2 and each inner surface of the upper and lower cases 1a and 1b. A central window 4 is opened in the center of the lower case 1b, and head windows 5 are opened in the upper and lower cases 1a and 1b in the radial direction of the central window 4, respectively. The disk 2 integrally includes a hub 2b facing the central window 4 at the center of the magnetic sheet 2a, and rotates about the hub 2b with the magnetic sheet 2a sandwiched between upper and lower nonwoven fabric liners 3, 3. The nonwoven fabric liner 3 is fixed to the inner surfaces of the upper and lower cases 1a and 1b by heat welding or the like, and is used to wipe off dust adhering to the disk 2. It has a window opening 11 and a head window opening 6.

Before the non-woven fabric liner 3 is fixed to the inner surfaces of the upper and lower cases 1a and 1b by heat welding or the like, the central window opening 11 and the head window opening 6 are aligned with the central window 4 and the head window 5, respectively. , upper and lower cases 1a,
1b. As this positioning means, a positioning ear part 8 is provided protrudingly from a part of the circular outer peripheral edge 3a of the nonwoven fabric liner 3, and the ear part 8
A method has been adopted in which the screws are engaged with recesses 10 formed on the inner surfaces of the upper and lower cases 1a and 1b.

[Problem to be solved by the invention]

However, the nonwoven fabric liner 3 is flexible, thin, bends easily, and is difficult to handle.
is formed into a rectangular shape having a width W smaller than the diameter D of the central window opening 11.

Therefore, when the nonwoven fabric liner 3 is assembled into the inner surfaces of the upper case 1a and the lower case 1b, the nonwoven fabric liner 3 is easily deformed, especially at the central window opening 11, and the nonwoven fabric liner 3 is not properly positioned and incorporated. It may happen. Such assembly tends to cause wrinkles in the nonwoven fabric liner 3, and the occurrence of wrinkles causes an overload on the rotation of the disk 2, causing problems such as requiring a large rotational torque.

Furthermore, in the conventional configuration in which the width W of the ear portion 8 is smaller than the diameter D of the central window opening 11, the length l of both side edges 8a, 8b of the ear portion 8 cannot be made sufficiently long. That is, since the outer diameter of the non-woven fabric liner 3 and the inner dimensions of the upper and lower cases 1a, 1b are determined to be constant dimensions in relation to the outer diameter of the disk 2, if the width W of the ear portion 8 is narrow, the The length l of both side edges 8a and 8b is also shortened. If the length l of both side edges 8a and 8b of the ear part 8 is short, the ear part 8
lacks engagement and retention force with the recess 10, and the function of positioning the nonwoven fabric liner 3 in the rotational direction is not fully exhibited, and even when subjected to slight vibrations on the assembly line, the position is likely to shift.

Furthermore, the displacement and unstable positioning of the nonwoven fabric liner 3 due to such vibrations is also due to the fact that only one ear portion 8 is provided at one location on the circular outer peripheral edge 3a.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a disk cartridge which can prevent deformation of the nonwoven liner and ensure reliable positioning function by carefully adjusting the number and dimensions of the positioning ears of the nonwoven liner.

[Means to solve the problem]

In the disk cartridge of the present invention, for example, as shown in FIG.
Central window opening 11 corresponding to the central window 4 and head window 5 of b.
and a head window opening 6, the circular outer peripheral edge 3a of the nonwoven fabric liner 3 is provided with positioning ears 8 that engage with left and right recesses 10 formed on the inner surface of the lower case 1b. A pair of left and right ears are provided, and the width W of the ears 8 is set larger than the diameter D of the central window opening 11.

[Effect]

The width W of the ear part 8 is the central window opening 11.
The reason for setting the diameter D to be larger than the diameter D is to prevent the nonwoven fabric liner 3 from being deformed particularly at the central window opening 11 during assembly.

The width W of the ear part 8 is the central window opening 11.
By setting the diameter D to be larger than the diameter D, when the outer diameter of the nonwoven fabric liner 3 and the inner dimensions of the upper and lower cases 1a and 1b are constant, both side edges 8a of the ear portion 8,
The length l of 8b is the length l of both side edges 8a and 8b of the conventional ear portion 8 having a width W smaller than the diameter D.
It is possible to form a longer length.

To obtain the nonwoven fabric liner 3, as shown in FIG. 4, a liner continuous body 9 is used in which liner semi-finished products 7 are connected in series via ears 8, and the ears 8 are cut and separated to complete the nonwoven fabric liner 3. Forming the non-woven liner 3 and forming the non-woven liner 3
It is advantageous to be able to manufacture and incorporate the disk case 1 into the disk case 1 in a consistent process. Even when such a manufacturing method of the nonwoven fabric liner 3 is adopted, if the width W of the ear portion 8 is set larger than the diameter D of the central window opening 11, the liner continuous body 9 is formed in a straight line in the longitudinal direction. A continuous region F can be obtained, and when the liner continuous body 9 is stretched in its longitudinal direction, the tensile force is shared by the continuous region F, so that the central window opening 11 is not deformed. There will be no chance of damage or damage. Furthermore, the non-woven fabric liner 3 is provided with a pair of left and right ears 8, and by engaging these with the left and right recesses 10 of the lower case 1b, the non-woven fabric liner 3 is able to withstand vibrations on the assembly line. The position can be held extremely stably and reliably without causing any positional shift.

〔Example〕

An embodiment of a disk cartridge according to the present invention will be described with reference to FIGS. 1 to 3.

The overall basic structure of this is that a disk 2 is rotatably built into a disk case 1 consisting of upper and lower plastic cases 1a and 1b, and a head window 5 is provided in the upper and lower cases 1a and 1b.
The central window 4 is further opened in the lower case 1b, and the upper and lower cases 1
The nonwoven fabric liner 3 is interposed between the inner surfaces of the disks a and 1b and the disk 2, and the like is almost the same as the conventional example described above.

In addition, the nonwoven fabric liner 3 is also made of synthetic resin fibers such as rayon, polypropylene, and polyester, and as in the past, it has a head window opening 6 corresponding to the head window 5 of the lower case 1b and a central window 4 of the lower case 1b. It has a central window opening 11.

However, the head window opening 6 is formed to communicate from the outer peripheral edge 3a of the nonwoven fabric liner 3 to the central window opening 11, so that the entire nonwoven fabric liner 3 has a C-shape. It is becoming. And non-woven liner 3
Ear portions 8 having a width W larger than the diameter D of the central window opening 11 are integrally provided on the circular outer peripheral edge 3a of the central window opening 11 at positions shifted to the left and right from the front head window opening 6. It has characteristics in points.

This non-woven fabric liner 3 is connected to the recess 10 of the lower case 1b.
It is integrally fixed to the inner surface with spot heat welding or the like. Prior to this fixation, the nonwoven fabric liner 3 has the ears 8 engaged with the recesses 10 to
The central window opening 11 and the central window 4, and the head window opening 6 and the head window 5 are positioned on the inner surface of the lower case 1b so that they coincide exactly with each other.

The nonwoven fabric liner 3 having the ears 8 having such a wide width W is incorporated into the inner surface of the lower case 1b without being deformed at the central window opening 11. Furthermore, by setting the width W of the ear portion 8 to be larger than the diameter D of the central window opening 11, the length l of both side edges 8a, 8b can be made as long as possible, and the recessed portion The ear portion 8 reliably engages with the ear portion 10 in a non-rotating manner.

Next, an example of a method of manufacturing the nonwoven fabric liner 3 and a method of assembling it into the disk case 1 will be described.

First, as shown in FIG. 4, a nonwoven fabric material made of synthetic resin fibers such as rayon, polypropylene, and polyester is punched out to form an annular liner semi-finished product 7 having a central window opening 11.
A continuous liner body 9 is formed in which the liner bodies are connected in series through the ears 8.

Since the width W of the ear portion 8 is set larger than the diameter D of the central window opening 11, it is possible to obtain a portion F that continues in a straight line in the longitudinal direction of the liner continuous body 9. Therefore the liner continuum 9
Even if a tensile force is applied in the longitudinal direction of the central window, this tensile force is shared by the continuous area F, so when the width W of the ear portion 8 is set smaller than the diameter D of the central window opening 11, It is possible to prevent improper elongation or deformation of the liner continuum 9 that may occur,
The dimension and shape stability of the liner continuous body 9 can be ensured.

This liner continuous body 9 is wound on a reel (not shown) near the assembly line of the disk cartridge, and is fed out one after another, cutting the middle between the first liner semi-finished product 7 and the following liner semi-finished product 7. At the same time, a heated nichrome wire or a heated Thomson blade is used to melt and cut the annular part of the liner semi-finished product 7 (the part indicated by the symbol H in the figure) to form the head window opening 6 as shown in FIG. has C
A completed product of the nonwoven fabric liner 3 in the shape of a letter is obtained.

The nonwoven liner 3 is subsequently placed on the inner surface of the lower case 1b on the assembly line. At that time, the nonwoven fabric liner 3 is placed so that the ears 8 engage with the recesses 10 formed on the inner surface of the lower case 1b, so that the central window opening 11 and the central window 4 are connected to each other, and the head window opening 6 and head window 5 will match exactly. The nonwoven fabric liner 3 thus positioned on the inner surface of the lower case 1b is fixed by spot thermal welding in a dotted manner.

Finally, the disk 2 is placed on the nonwoven fabric liner 3 in the lower case 1b, and the upper case 1a with the nonwoven fabric liner 3 fixed to its inner surface is placed over the disk 2 and integrally connected to the lower case 1b.

In this way, while the liner continuous body 9 is being fed out, the first liner semi-finished product 7 is cut to form a C-shaped finished product of the nonwoven fabric liner 3, and this nonwoven fabric liner 3 is sequentially attached to the lower case 1b on the assembly line. By supplying the nonwoven fabric liner 3 to the lower case 1b, it is possible to automatically supply the nonwoven fabric liner 3 to the lower case 1b, thereby dramatically improving production control and assembly workability.

Note that the process of forming the head window opening 6 in the liner semi-finished product 7 was performed at the same time as the process of cutting and separating the liner semi-finished product 7 from the liner continuous body 9 in the above embodiment, but instead of this, the cutting Separation processing may be carried out one after the other.

In addition, although a 3.5-inch disk cartridge is illustrated in the illustrated example, the present invention can be effectively implemented on a 3-inch disk cartridge or other disk cartridges.

〔Effect of the invention〕

According to the disk cartridge of the present invention, since the width W of the ear portion 8 of the nonwoven fabric liner 3 is set larger than the diameter D of the central window opening 11,
This nonwoven fabric liner 3 can be prevented from deforming at the central window opening 11 and can be appropriately positioned with respect to the inner surface of the lower case 1b. In addition, since deformation of the nonwoven fabric liner 3 is prevented in this way, wrinkles do not occur therein, and overload of the rotational torque of the disc 2 due to the occurrence of wrinkles can be prevented, and the disc 2 can be rotated smoothly. can. Furthermore, both side edges 8a and 8b of the ear portion 8
This makes it possible to make the length l as long as possible, increasing the force of engagement and retention with the recess 10, and exhibiting a reliable positioning function. Such non-woven liner 3
The stable and reliable positioning effect is achieved by providing a pair of left and right ears 8, which are inserted into the left and right recesses 10 of the lower case 1b.
This can be further improved by engaging with.

In addition, when obtaining the nonwoven fabric liner 3, a liner continuous body 9 in which liner semi-finished products 7 are connected in series through the ears 8 may be used, and the ears 8 may be cut and separated to obtain the finished product of the nonwoven fabric liner 3. , liner continuum 9
When it is pulled in its longitudinal direction, the tensile force applied to the liner continuous body 9 can be prevented from being damaged or deformed at the central window opening 11, and the stability of the size and shape of the liner continuous body 9 can be ensured. It is advantageous.

[Brief explanation of drawings]

1 to 5 show one embodiment of the present invention, FIG. 1 is a plan view of the inside of the disk cartridge, FIG. 2 is an external plan view of the disk cartridge, and FIG. 3 is a plan view of the inside of the disk cartridge. 4 is a plan view of the nonwoven liner in the middle of the manufacturing process, and FIG. 5 is a plan view of the nonwoven liner. FIG. 6 is a partially cutaway plan view of a conventional disk cartridge. 1...Disk case, 1a...Upper case, 1
b...lower case, 2...disk, 3...nonwoven fabric liner, 4...central window, 5...head window, 6...opening for head window, 8...
...Ear portion, 10...Concave portion, 11...Central window opening.

Claims (1)

[Scope of Claims] 1. A disk 2 is rotatably placed in a disk case 1 consisting of a lower case 1b having a head window 5 and a central window 4, and an upper case 1a coupled to the lower case 1b in a lid-fitting manner. In the disk cartridge, which is built into the lower case 1b and has a nonwoven fabric liner 3 made of synthetic resin fiber interposed between the inner surface of the lower case 1b and the disk 2, the nonwoven fabric liner 3 is connected to the central window 4 of the lower case 1b. The central window opening 11 is provided in the corresponding part, and the head window 5 of the lower case 1b is
A head window opening 6 is formed in a corresponding portion, and an ear portion 8 having a width W larger than the diameter D of the central window opening 11 is formed radially outward on the circular outer peripheral edge 3a of the nonwoven fabric liner 3. A pair of left and right ears are formed to protrude, and the nonwoven fabric liner 3 is positioned on the lower case 1b by engaging the left and right pair of ears 8 with the left and right recesses 10 formed on the inner surface of the lower case 1b. disk cartridge.