JPH0740426B2 - Method for manufacturing center plate in disk cartridge - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a disk cartridge in which a recording disk such as a magnetic disk or an optical disk is housed in a case, and particularly to a tip of a drive spindle inserted in the disk cartridge. Therefore, the present invention relates to a method for manufacturing a center plate provided on an inner wall of a case.

[Background technology]

Many disc cartridges of this type are known.
FIG. 6 shows the basic structure of the magnetic disk cartridge. In the figure, the disk cartridge is formed by rotatably storing a disk 4 in a case 1 in which an upper case 2 and a lower case 3 made of a rigid resin such as ABS resin are attached. The inner edge of the disk 4 is fixed to a hub 5 made of a metal material, and a hole 5a with which the spindle 7 of the drive device 6 is engaged is formed in the center of the hub 5 so that the rotational force of the spindle 7 causes the hole 5a to be It is transmitted to the disk 4 via the. A center plate 8 that is in contact with the tip of the spindle 7 is fixed to the inner wall of the central portion of the upper case 2 to position the case 1 with respect to the drive device 6 in the spindle axial direction. The upper and lower cases 2 and 3 have openings 2a and 3a into which magnetic heads (not shown) of the driving device are inserted.
A magnetic head is used to record data on the disk 4 or read information from the disk 4 through the openings 2a and 3a.

A cleaning sheet 9 is provided on the inner walls of the upper and lower cases 2 and 3 so as to face the disk 4 and cover substantially the entire surface.

By the way, when recording / reproducing is performed using the disk cartridge, the contact pressure between the magnetic head and the disk 4 is set on the driving device 6 and the insertion position of the magnetic head which is predetermined on the driving device side. When the disk 4 is made of a thin flexible material, the disk 4 is lifted upward at the head contact portion and warped to obtain a sufficient contact. The pressure may not be obtained. Therefore, conventionally, a center plate 8 as shown in FIGS. 6 and 7 is provided, and the tip of the spindle 7 is brought into contact with the center plate 8, whereby the upper case 2
The outer peripheral portion of the disk is urged downward to indirectly apply the contact pressure to the magnetic head to the disk 4.

The center plate 8 used for this purpose is preferably made of a material having excellent lubricity and wear resistance, and is made of, for example, synthetic resin such as ultra-high molecular weight polyethylene, fluorine resin, polypropylene, acetate, and polyamide.

Conventionally, as shown in FIGS.
The method shown in the figure was used.

That is, first, as shown in the plan view and sectional view of FIGS. 8A and 8B, a band-shaped member 13 in which a center plate material 10 is bonded to a release paper 12 with an adhesive 11 is prepared. Next, the belt-shaped member
A mold is put on 13 from above and below, and as shown in FIGS. 8 (c) and 8 (d), punch holes 13A are punched out at a predetermined interval, and a circular center plate is formed on release paper 12 by half punching. 8 is formed. At this time, the center plate material 10 is removed, leaving the circular center plate 8.

As shown in FIG. 9, the belt-shaped member 13 thus obtained has a pilot hole 13a with a sprocket 14A of the feed roller 14.
The center plate 8 is peeled off by the peeling blade 15 with the pressure sensitive adhesive 11 on the lower surface by being engaged with. This is sucked and held by the suction device 16 and fixed by being crimped into the central concave portion 2b of the upper case 2 which is arranged in the vicinity in advance.

However, in the above method of manufacturing the center plate, the release paper
Of the center plate material 10 adhered to the entire surface of 11, only the circular punched part is used as the center plate 8, which is extremely uneconomical in terms of material usage efficiency. In particular, this type of center plate material uses a relatively expensive synthetic resin having high lubricity and high wear resistance, and therefore cannot be ignored in terms of cost. Further, since the release paper to which the center plate material is attached is also finally removed, it is an obstacle to cost reduction.

[Object of the Invention] The present invention has been made in view of the above points, and an object of the present invention is to provide a method for manufacturing a center plate in a disk cartridge which can improve the yield of the center plate material and can be mass-produced at low cost. I am trying.

[Outline of Invention]

In order to achieve the above object, the present invention has a strip-shaped member in which a peelable center plate material and a pressure-sensitive adhesive are laminated, wound around a reel, pulled out by a predetermined length, and cut with a cutter to form a rectangular shape. The above center plate is obtained, the center plate material is not wasted, and release paper is not required.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

First, as shown in FIG. 1 (b), a belt-shaped member 17 in which a pressure-sensitive adhesive 11 is laminated on one surface of a center plate material 10 is prepared. As the center plate material 10, a synthetic resin having high slipperiness, high abrasion resistance and sufficient peeling property is preferable, and fluorine resin, ultra high molecular weight polyethylene, polypropylene,
Acetate or the like is used. The pressure-sensitive adhesive 11 is preferably an adhesive tape such as a double-sided tape. If this band-shaped member 17 is cut as shown by the chain double-dashed line in FIGS. To be

FIG. 2 is a perspective view of the center plate 8, which has a substantially square shape, and the tip of the spindle 7 of the drive device 6 contacts from below.

FIG. 3 shows a center plate manufacturing method. Belt-shaped member 17
Is wound around a reel 18 and has a pair of rollers 19 and 2 at its tip.
It is sandwiched between 0s and sent sequentially. Fig. 4 is an enlarged view of the part wound around the reel 18, which shows the center plate material.
Although 10 and 11 layers of the pressure-sensitive adhesive are alternately laminated, the center plate material 10 has a peeling property, so that it can be easily delivered from the reel 18 by pulling out the tip thereof. FIG. 5 shows the cross-sectional shape of the reel 18.
The reel 18 has walls 18a on both sides in order to prevent the strip-shaped members 17 that are sequentially wound due to the peeling property of the center plate material 10 from collapsing.

In FIG. 3, the pair of rollers 19, 20 is a belt-shaped member 17.
To feed the paper with a specified pitch.
19 is formed of a material such as rubber, and the center plate material 10
The feed of the belt-shaped member 17 is adjusted by the frictional force with the surface, and the other roller 20 is formed of a material having a peeling property such as fluorine resin, and does not bond with the pressure-sensitive adhesive 11 of the belt-shaped member 17. Thus, the belt-shaped member 17 is accurately conveyed by a predetermined amount.

The pair of rollers 19, 20 is temporarily stopped when the fed strip-shaped member 17 is fed out for a predetermined length, and is placed on the support base 21 for a predetermined length.
Thereafter, the upper blade 22 is actuated, and the lower blade of the tip 2 of the support 21 and the upper blade 22 cut the strip-shaped member 17 into a predetermined length. The cut center plate 8 is suction-held by the suction device 16,
Move it to the upper case 2 arranged in the vicinity,
It is crimped to the concave portion 2b.

In this way, a large number of center plates 8 can be continuously formed by sequentially sending out, cutting and sucking the belt-shaped member 17.

〔The invention's effect〕

As described above, according to the present invention, all of the center plate material is used without waste, and the release paper for holding the center plate material in the working process is not required.
Therefore, the material yield is improved, the material cost is significantly reduced, and the center plate can be continuously manufactured.

[Brief description of drawings]

1 (a), (b), (c), and (d) are plan views and sectional views for explaining the outline of the manufacturing process of the center plate according to the present invention, and FIG. 2 is a perspective view of the center plate according to the present invention. FIG. 3 is an explanatory view of a center plate manufacturing apparatus in an embodiment of the present invention, FIG. 4 is an enlarged cross-sectional view of a belt-shaped member wound on a reel, and FIG. 5 is a reel used in an embodiment of the present invention. A sectional view, FIG. 6 is a sectional view showing the structure of a disk cartridge which can adopt a center plate according to the present invention, and FIG. 7 is a perspective view of a conventional center plate, FIG. 8 (a),
(B), (c) and (d) are plan views and cross-sectional views for explaining the outline of the conventional manufacturing process of a center plate, and FIG. 9 is an explanatory view of a conventional center plate manufacturing apparatus. 1 ... Case, 2 ... Upper case, 3 ... Lower case, 4 ...
... disk, 7 ... spindle, 8 ... center plate, 10 ... center plate material, 11 ... pressurizing adhesive,
17 …… Strip-shaped member, 18 …… Reel, 19,20 …… Roller, 21
…… Stopper, 22 …… Upper blade.

Claims (1)

[Claims] 1. A center plate of a disk cartridge comprising a disk housed in a case, the disk being rotated by a spindle inserted from the outside of the case, and a center plate abutting against the tip of the spindle on the inner wall of the case. , A strip-shaped member having a pressure-sensitive adhesive layer formed on one surface of a peelable center plate material is wound around a reel, and the strip-shaped member is pulled out by a predetermined length and cut into a predetermined length to obtain a rectangular center plate. Of manufacturing a center plate in a disc cartridge.