JPS6182394A - Manufacture of disk cartridge and unwoven fabric liner used for this - Google Patents

Abstract

PURPOSE:To eliminate a nap which occurs at the time of cutting and to prevent occurrence of a drop-out, etc. by melting and hardening an opening part, an edge, etc. of a C-shaped unwoven fabric liner made of the synthetic resin fiber between the disk case having the head window and the built-in disk. CONSTITUTION:An unwoven liner 3, which is composed of rayon and thermoplastic resin such as polypropylene and polyester, between a disk case having a head window and a disk. The liner 3 pays out a continuous body 9, a liner half-finished goods 7, from the reel to which this is wound and is cut individually at the part of an ear 8. At the same time of the cutting or after cutting, an edge part 6a and a remaining ear part 8a of an opening part 6 (in a half- finished goods, part H shown by oblique lines) are melted and hardened by using a heating Thomson blade and a nickrome wire. Thus, when the disk is rotated a nap which occurs at the time of cutting, is melted and hardened, unravelling of the unwoven fabric is eliminated during use, the damage of the disk is eliminated and the occurrence of the drop-out is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disk cartridge in which a disk is rotatably housed in a disk case, and a method for manufacturing a nonwoven fabric liner used therein.

[Conventional technology]

FIG. 1 shows a typical example of a disk cartridge to which the present invention is directed, and is well known from the prior art, for example, from Japanese Utility Model Application Publication No. 59-122663.

The basic configuration of this is a plastic upper and lower case 1a.
A disk 2 is rotatably housed in a disk case 1 which is formed by connecting the disk case 1b with the lids together, and a nonwoven fabric liner 3 is interposed between the disk 2 and the upper and lower inner surfaces of the disk case 1. The disk case 1 has a central window 4 approximately in the center and a head window 5 in front of the central window 4. The disk 2 has an integrated hub 2a in the center, and rotates with the hub 2a facing the central window 4 and two main body parts (magnetic sheet parts) sandwiched between upper and lower nonwoven fabric liners 3. The nonwoven fabric liner 3 is fixed to the inner surface of the case and is used to wipe off dust adhering to the disk 2, and is formed in a C-shape that escapes from the central window 4 and head window 5.

Conventionally, this type of nonwoven fabric liner 3 is generally made of thermoplastic synthetic resin fibers, and is punched and cut into a C-shape using a Thomson blade.

[Problem that the invention seeks to solve]

However, since the conventional nonwoven fabric liner 3 is obtained by simply punching and cutting, the edges of the cut edge.

In particular, the edge 6a of the opening 6 corresponding to the head window 5
Synthetic resin fibers come out. This fluff is pulled out long enough to get stuck between the disk 2 and the head, or torn off and attached to the disk surface.

This was the cause of dropouts.

The appearance of the product was also unsightly.

Therefore, the inventors of the present invention considered that after cutting the nonwoven fabric liner 3, the cut edge portions of the nine problems should be further burnt.

However, this is laborious and requires two steps.

From this point of view, an object of the present invention is to prevent fuzz from appearing on at least the edge 6a of the opening 6 of the nonwoven fabric liner 3 corresponding to the head window 5.

Another object of the present invention is to easily obtain a nonwoven fabric liner 3 by preventing fuzz from appearing at the same time when cutting the opening 6 without performing a fuzz baking treatment after each cutting. .

[Means for solving problems]

Specifically, in the present invention, we have focused on the fact that the nonwoven fabric liner 3 has conventionally generally been made of thermoplastic synthetic resin fibers, and as shown in FIG. Cut and form with heated nichrome wire or Thomson blade. In this case, a nonwoven fabric liner 3 having a C-shape in plan view is obtained, and if the edge 6a of the cut opening 6 is heat-treated, it will be melted and solidified in the same manner as the frilled baking treatment, and the edge 6a will be melted and solidified. It is free of lint and does not fray during use.

Further, in the present invention, in order to obtain the nonwoven fabric liner 3 of the above-mentioned form, as shown in FIG.
are connected in series through ears 8 to form a band-shaped liner continuum 9, and from the front of the liner continuum 9, the liner semi-finished product 7 is
The liner semi-finished product 7 is separated by cutting separately at the ear 8 part.
The manufacturing method is such that the annular part of the liner semi-finished product 7 is cut and removed by thermal cutting to form the opening 7 at the same time or in succession to the cutting and separation. Note that, in order to ensure the dimensional or shape stability of the liner continuous body 9, it is desirable that the width of the lugs 8 is set to be longer than the inner diameter of the liner semi-finished product 7.

〔Effect of the invention〕

According to the present invention as described above, since the edge 6a of the opening 6 of the nonwoven fabric liner 3 corresponding to the head window 5 is melted and solidified by heat treatment during cutting, no burrs appear at the corresponding location. The fused edge 6a hardens when cooled, so
The fluff will not come loose during use. In this way, a disk cartridge is obtained which can well prevent the occurrence of dropouts. Furthermore, if the openings 6 are made separately after cutting, it is not necessary to perform a baking process, thereby streamlining the work.

Further, according to the method of the present invention, the liner continuous body 9 is wound on a reel and placed near the assembly line, and the line semi-finished products 7 are individually cut and separated from the ears 8 starting from the front of the liner continuous body 9, and By thermally cutting the opening 6, a C-shaped nonwoven fabric liner 3 can be obtained, and the nonwoven fabric liner 3 can be assembled into the cartridge case 1 as it is.

Production management and assembly workability can be dramatically improved. In addition, the ear portion 8a remaining on the outer periphery of the nonwoven fabric liner 3
It has the advantage that it can be used for positioning with respect to the inner surface of the cartridge case if necessary.

〔Example〕

In Figure 4, rayon and polypropylene.

A continuous liner body 9 in which ring-shaped liner semi-finished products 7 are connected in series through ears 8 is made by punching a nonwoven fabric material made of thermoplastic synthetic resin fibers such as polyester. The width of this ear 8 is larger than the inner diameter of the liner semi-finished product 7. This liner continuous body 9 is wound on a reel, and is fed out near one assembly line, and each liner semi-finished product 7 is individually cut and removed from the front at the edge 8, and then heated. A C-shaped nonwoven fabric liner 3 as shown in FIG. 5 is formed by cutting a ring-shaped part of the liner semi-finished product 7 (the part indicated by the symbol H in the figure) using a heated nichrome wire or a heated Thomson blade. . Next, the nonwoven fabric liner 3 is placed on the disk case 1 on the second assembly line. At this time, the nonwoven liner 3 aligns the opening 6 with the head window 5.

The inner surface of the disc case 1 is dotted with spot heat welding.
A disk cartridge shown in FIG. 1 was obtained.

At this time, the ears 8a remaining on the outer periphery of the nonwoven fabric liner 3 were engaged with the recesses 10 on the case side, as shown in FIG. 1, and used for positioning.

According to the disk cartridge thus obtained, no fuzz was observed on the edge 6a of the opening 6 of the nonwoven fabric liner 3, even when visually inspected. Although it was used repeatedly in experiments, no fraying or fraying came out from the edge 6a.

Note that the unit liner semi-finished product 7 is transferred from the liner continuum 9 to the ear 8.
The process of cutting and separating via the liner semi-finished product 7 and the process of thermally melting the annular portion H of the liner semi-finished product 7 may be performed simultaneously or may be performed one after the other, and the lug 8 can also be thermally melted.

The entire nonwoven fabric liner 3, including the inner circumferential edge 3a and outer circumferential edge 3b, may be cut and formed by thermal cutting at the same time.

In this case, it is possible to effectively prevent fiber waste from fraying from all the cut edges and transferring to the disk surface.

As a means for melting and solidifying the edge 6a of the opening 6 of the nonwoven fabric liner 3, other than hot melting, a method may be used in which the cut edge is cut with a cutting blade and then heat treated by applying a hot plate to the cut edge.

In the other two illustrated examples, a 3.5-inch type disk cartridge is illustrated, but the present invention can be effectively implemented in other 3-inch type disk cartridge lithologies. In these cases, embodiments are also included in which the edge 6a of the opening 6 of the nonwoven fabric liner 3 does not face near the open edge of the head window 5, but is a little apart. That is, although the nonwoven fabric liner 3 is said to have a C-shape, it may also have a horseshoe shape when viewed from above.

[Brief explanation of drawings]

FIG. 1 is a plan view of the inside of a disk cartridge according to the present invention, FIG. 2 is a plan view of its external appearance, and FIG.
An enlarged sectional view taken along the mm line in the figure. FIG. 4 is a plan view showing the non-woven fabric liner in the middle of the manufacturing process, and FIG. 5 is a plan view showing the non-woven fabric liner. 1... Disc case. 2...Disk. 3...Nonwoven fabric liner. 4...Central window. 5... Head wind. 6...Opening part of the nonwoven fabric liner. 6a...Edge of opening. 8... ears. 8a...Remaining ear part.

Claims (2)

[Claims] (1) A C-shaped nonwoven fabric liner 3 made of thermoplastic synthetic resin fibers is interposed between the disk case 1 having the head window 5 and the disk 2 built into the case 1. 3. A disk cartridge characterized in that an edge 6a of an opening 6 corresponding to at least a head window 5 of No. 3 is melted and solidified. (2) A band-shaped liner continuum 9 in which annular liner semi-finished products 7 are connected in series via ears 8 is made by punching a non-woven fabric material made of thermoplastic synthetic resin fibers, and the liner continuum 9 is The liner semi-finished product 7 is individually cut and separated at the ears 8 from the front, and at the same time as the liner semi-finished product 7 is cut and separated, or at the same time, an annular part of the liner semi-finished product 7 is cut and removed by thermal welding to open the liner semi-finished product 7. forming a portion 6;
A method of manufacturing a nonwoven fabric liner for use in disk cartridges.