JPS58166569A - Punching hole processing method for jacket for floppy disk - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The present invention relates to a processing method for eliminating protruding parts such as fluff and protrusions that occur at the cut end of the hole or notch after punching a hole or notch in a floppy disk jacket. The purpose of this is to improve quality, performance, workability, etc. by eliminating the problems that have arisen with the conventional method. First, the problems of the conventional method will be described in summary using Figures 1 to 114. .

The floppy disc assembly Q is provided with an IK write protection notch A1 a head window B1 an index window C, a central window D for the disk W, and a stress relief notch 1 as shown in Part 1II. ◎Jacket 811, all! As shown in WAK, the above-mentioned floppy disc assembly QK)10
A lining 3 made of a fiber material such as cloth or non-woven fabric is placed on one side of the rectangular sheet 2, which is larger than the size of the rectangular sheet 2 (two sheets in a row). Piece 2c
Of the pasting allowances 2ds, 26s, and 2f, which are superimposed on the two folds and provided on the three sides of the front piece 2b, the pasting allowance on the flesh side is zdsze.
is pasted to form a bag shape as shown in Fig. 3, and a notch A'2 corresponding to the write protection notch of the floppy disk assembly Q and a hole B corresponding to the head window BK are attached to this.
', a hole C' corresponding to the index window CK, a hole D' corresponding to the central window DK, and a notch E' corresponding to the stress relief notch E are provided by punching.

To punch out these holes and notches, as shown in FIG. 116, the bag-shaped sheet 2 as described above is placed on the female die 6, and the male die 4 is lowered to perform punching. In this case, the lining 3 on the inner surface of the sheet 2 is not completely cut, and fuzz 3/ is generated at the cut end. The fluff of the disc later turns into dust and rotates at the same speed as the disc W, causing errors during recording and playback. Particularly in the head window D, even a small amount of fluff can cause errors, so it is necessary to completely prevent the occurrence of fluff.

The formation of fuzz 3' as described above is caused by the removal hole 5 in @fl16.
Enter into the same hole as the inner circumferential surface of! Even if the gap with the outer peripheral surface of the lining 3 is made as small as possible, this cannot be completely prevented, so one way to prevent this is to make the above-mentioned cuts or the like in the lining material before attaching the lining 3. Hole (A'.

B/, C/, D/Ca E') slightly (0,5~2
-) Large holes or notches are punched out in advance and this lining material is pasted onto the sheet (2), but this increases the number of machining operations and increases the cost.

The present invention has been made to solve the above problems, and -
A plastic sheet with a lining made of fiber material on the surface is folded in half with the lining inside, and in the next state, the required holes and notches are punched out, and the areas around the holes and notches are pressed. The present invention relates to a method for processing a punched hole in a shag for a floppy disk, characterized in that the cut portion of the lining is made to protrude toward the hole or notch, and then the protruding portion is contracted by heating.

Hereinafter, the present invention will be described in FIGS. 5 to 1! This will be explained with reference to Figure 8.

Jacket st No. 5 after punching holes and notches as described above.
As shown in the figure, the press plate 7 and the receiver W8 are pressed together and heated [9] to perform heating. Are the push plate 7 and the mold 8 made of the above jacket?
S hole or notch (in 33/, QF.

Holes ζ7 and 8D for the central window are shown in the figure. Heating II9 is equipped with heater 0.

In addition, the sheet 2 and lining 3 of the push plate 7, receiver ms, and heating 99 may change in quality during the heat treatment, causing scratches on the disk WK when the floppy disk Q is used, or causing problems in the rotation of the disk W. Various measures are taken to prevent the occurrence of warpage.

As shown in Figure 6, the jacket 8 is pressed down with the press plate 7, and the inner lining 3, which is also folded in half, is pressed tightly between the two folded sheet pieces 2b-2C.
Heating 3 to the hole y of hole b of jacket 8
19 and heat it. A gap Vt- exists between the inner peripheral surface of the hole 7D, aI) and the outer peripheral surface of the heating l119,
The dimension of this gap varies depending on the heating temperature of the heating mold 9 and the material of the lining 3. For example, if the thickness of the sheet 2 is 0.25mm, the material of the nonwoven fabric used as the lining 3 is laminated. Thickness is 0.1 at 100-
If the temperature is 8, change the temperature of heating@9 to 400C1 heating 9
If the time that is in the lining 3 is 0°1 second, then
Iv was 0.2-, and a good fluff removal 9 was achieved. If this gap is too narrow and heating@9 comes into contact with sheet 2, sheet 2
The same contact portion of the wafer may be deformed, causing a problem, and if the temperature is large and the heating temperature is low, the fluff removal effect will be reduced.

As described above, when the heating mold is inserted into the hole of the jacket and heated, the fluff in the hole is thermally contracted, forming a rounded surface R as shown in FIG. Note that the push plate 7 and the receiving cover 8 may be arranged such that the pushing plate 7 is movable and the receiving body is fixed, or vice versa.

In addition, by providing a ridge Ilt on the lower surface of the periphery of the hole 7D and/or on the upper surface of the periphery of the mutual support as shown in FIG. Strongly suppresses the surrounding S of (and the same incision) 1! It is possible to improve the protrusion of the lining into the contact hole and improve the heat shrinkage of the protruding portion. In addition, in the case of mass production, in order to prevent heat accumulation in the receiving am during heating of the press plate 7, heat accumulation is prevented by hand RK such as circulating cooling water through them, and warpage deformation of the sheet 2 is prevented. As described above, the protruding parts such as fuzz and protrusions that occur in the holes punched into the jacket can be easily shrunk by inserting a heating mold into the chain holes or notches and heating them. This is an excellent invention that easily solves the problems of conventional products, increases work efficiency, improves product performance, and reduces stress, allowing us to provide excellent products at low prices.

[Brief explanation of the drawing]

Figure 1 is a plan view of the surface of a floppy disk. Jaquera, lumber. □Show the surface-I-Figure, Figure 3 is the second
Back side plan view of the jacket made by folding the material shown in Figure 4.
Figure 5 is a cross-sectional view of the punching process, Figures 5 and 6 are cross-sectional views of the fluff removal process according to the present invention, Figure 7 is a cross-sectional view of the punched hole after the fluff removal process, and Figure 8 is a cross-sectional view of the punched hole after the fluff removal process. FIG. 3 is a cross-sectional view of a push plate and a receiving mold used in the fluff removal process, with a projecting edge provided on the upper or lower surface of the hole circumference. 2 is a sheet, 3 is a lining, 7 is a push plate, 8 is a receiving mold, 9 is a heating lid, and IQ is a holder. Procedural Amendment June 9, 1980 1, Case Table 11 < 1982 Patent Application No. 48256 2, Title of Invention: Method for processing punched holes in jackets for floppy disks 3,
Relationship with the case of the person making the amendment 41 Applicant Address Name (4117) Submitted by Mitsubishi Plastics Co., Ltd. 8. Number of inventions increased by amendment ``Surface plan view'' on page 9, line 7 of the specification is corrected to "Front view", "Developed plane" in line 8 of the same page is corrected to "Developed back", and corrected to "Back side plan view Jtr rear view" in line 10 of the same page. that's all

Claims (1)

[Claims] 1. A plastic sheet with a lining made of fiber material on the - side is folded in half with the skeleton lining inside, and the required holes and notches are punched out. A method for processing a punched hole in a jacket for a floppy disk, which involves pressing the peripheral part to cause the cut part of the lining to protrude toward the hole or notch, and then shrinking the protruding part in the armpit by heating.