JPH03187078A - Magnetic disk cartridge and production thereof - Google Patents

Abstract

PURPOSE:To simplify production by holding and mounting a disk in place by the two pieces of a liner formed by cutting out the liner from the raw sheet of roll shape and two-folding the cut out liner. CONSTITUTION:The liner 22 is two-folded and is housed between a lower case 1 and an upper case 4 so as to envelope the disk 3 by which the disk cartridge is assembled. For example, the liner is simply necessitated to be mounted to either of the upper and lower cases at the time of mounting the liner by welding, etc., to the case. Since there is no need for mounting the liner to the other of the upper and lower cases, the need for mounting the liner to the other of the upper and lower cases and turning over the case at the time of assembly is eliminated. Since the cartridge is assembled by a series of stages, the entire part of the equipment for assembling is simplified and the smooth operation is expected.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetic disk cartridge, and more particularly to a magnetic disk cartridge in which a magnetic disk is rotatably housed in a case body formed of an upper case and a lower case. and its manufacturing method.

Conventional technology Conventionally, this type of magnetic disk cartridge (hereinafter referred to as "magnetic disk cartridge")

The cartridge (abbreviated as "cartridge") had a configuration as shown in FIG. FIG. 4 shows the configuration of a 3.6 inch micro floppy disk cartridge (also referred to as a 1190m flexible disk cartridge),
FIG. 3 is a perspective view with a portion thereof cut away. In the figure, a lower liner 2 cut out from acrylic nonwoven fabric or the like is partially welded to the inner surface of the lower case 1 at several locations.
Furthermore, on top of that is a thin sheet of disk-shaped magnetic disk (hereinafter referred to as "
3 is rotatably mounted on the disk. Also on the inner surface of the upper case 4.

As in the case of the lower case 1, an upper liner 5 is welded. This upper case 4 is combined with the lower case 71 and joined by ultrasonic welding.

Note that 6 in Figure 1 is pasted on disk 3.

It is a metal center core that provides driving force to the disk by a drive shaft (not shown) of a disk drive device.

Problems to be Solved by the Invention In such a conventional configuration, the lower liner 2 and the upper liner 5 must be separately welded to the lower case 1 and the upper case 4, which requires a lower case assembly machine and an upper case assembly machine. Two pieces of assembly equipment are required. Further, it is necessary to perform the troublesome work of placing the disk 3 on the lower case 1 and then inverting and attaching the upper case 4.

The present invention takes the above-mentioned conventional problems into consideration and aims to provide a magnetic disk cartridge button that is easy to manufacture and a manufacturing method.

Means for Solving the Problems In order to solve this problem, the present invention provides that, instead of the conventional method of separately attaching the lower liner and upper liner to the lower case and the upper case, the same roll-shaped liner is used. The disc is attached by sandwiching the disc between two pieces of liner cut out from the original fabric and folded in half.

Function With this configuration, for example, when attaching the liner to the case by welding, etc., it is only necessary to attach it to one of the upper and lower cases, and there is no need to attach the liner to the other of the upper and lower cases, so when one assembly is performed, the liner is attached to the upper and lower cases. There is no need to attach the liner to the other side and then flip it over.

EXAMPLE 1 An example of the present invention will be described below with reference to FIG. The same numbers are used for parts corresponding to those in the conventional example, and duplicate explanations will be omitted.

As shown in the figure, one piece 22a of the liner 22, cut into 9 parts and folded into 12 pieces from a raw liner fabric, is partially welded to the inner surface of the lower case 71 at several places, and then a disc is placed on top of it. 3 is mounted rotatably. Furthermore, from above, the other piece 22b of the liner 22 is attached to the disk 3.
The projecting parts 22b-1 to 22b-4 are partially welded to the lower case 1. Note that, instead of being directly welded to the lower case 1, the piece 22b may be welded to the piece 22a that is welded to the lower case 71. It is also possible to weld the liner pieces 22a and 22b to the lower case 1 at the same time. In this case, the protruding portions of the liner 22 may be provided at different locations on one piece and the other piece. Lower case 71 for welding
It may be fixed by sandwiching it between the upper case 4 and the upper case 4,
It may be allowed to freely move between the lower case 1 and the upper case 4. Finally, the upper case 4 is combined with the lower case 1 and ultrasonically welded as in the conventional case.

FIG. 2 shows a cross-sectional view of the cartridge shown in FIG. 1 taken along arrow line A--A. As shown in FIG. 2, liner pieces 22a and 22b that sandwich the disk 3 from above and below are welded to the lower case 1. The piece 22b is welded to a portion of the overhanging portion 22b-2 extending outward from the disk 3. f-g-h
-ij are welding points. A two-dot chain line 220 is a bent portion, and a slit 23 is provided parallel to this line.

It may be made easier to bend.

I explained that 1 or more cases are welded to the lower case 1,
It may also be welded to the upper case 4.

What has been described as welding up to now may be thermal welding, ultrasonic welding, or adhesion with the same effect, and fitting or the like may be used to integrate the upper and lower cases.

Effect of the invention According to the present invention as explained in the above embodiments.

During the manufacturing process, the liner is folded in half and stored between the lower case and upper case so as to wrap around the disc, and then assembled. This eliminates the need for welding equipment, and eliminates the extra work of inverting the upper case, and the assembly is completed in a series of steps, simplifying the overall assembly equipment and ensuring smooth operation.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the internal structure of a magnetic disk cartridge according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of a main part of a magnetic disk cartridge according to the embodiment, and FIG. FIG. 4 is a perspective view showing the structure of a conventional magnetic disk cartridge. 1...Lower case, 3...Magnetic disk, 4...Upper case, 22...Liner, 22a...One side of the liner Piece, 22b...
...The other piece of the liner 22, 22b-1 to 22b
-4...Extension 9 part.

Claims (2)

[Claims] (1) A case body consisting of an upper case and a lower case, a magnetic disk rotatably housed inside the case body by an external drive shaft, and interposed between the case body and the magnetic disk. A magnetic disk cartridge comprising a liner, the liner being folded in two, and the magnetic disk being sandwiched between two pieces of the liner. (2) After fixing one piece of the folded liner to one of the upper and lower cases by welding, the magnetic disk is wrapped between them, and the other piece of the liner is welded to the other of the upper and lower cases or the other piece of the liner. A method for manufacturing a welded magnetic disk cartridge. (2) A magnetic disk cartridge manufacturing method in which a magnetic disk is sandwiched between two pieces of a liner folded in half, and then the liner is welded to a case.