JPS6069870A - Punched hole processing method of jacket for floppy disc - Google Patents

Abstract

PURPOSE:To fuse and contract a protruded part by punching a plastic sheet provided with a lining of fiber materials to form a required hole, and applying a DC high voltage to the peripheral part of this hole and heating the cut part of the lining in the state where this cut part is protruded to the hole. CONSTITUTION:Sheets 2 are provided with linings 3 and are punched by a puncher to form a required hole. This semiprocessed goods is held between a pressing plate 7 and a receiving mold 8. A heating mold 9 slightly smaller than a window D is provided above a hole 7D corresponding to the window D so that this mold 9 can be freely taken into and out from the window D, and a heater 10 is buried in the heating mold 9. The + pole of a DC high voltage generating device 11 is connected to the pressing plate 7 and the receiving mold 8, and the - pole is connected to the heating mold 9. When the DC high voltage is applied to the peripheral part of the hole from the time before insertion of the heating mold 9 to the time just after insertion by this device, nap or the like in the cut part is attracted toward the heating mold 9 and is protruded; and therefore, a protruded part 31 is fused and contracted efficiently by the heating mold 9.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for forming a hole 1' in a disk.
Punch out the notches (hereinafter collectively referred to as "holes") (4)
This process involves eliminating protruding parts such as fuzz and protrusions that occur at the cut end of the hole.The purpose of this treatment is to eliminate the problems that occurred with conventional J-Vkets, and to improve quality, performance, workability, etc. It is in order to improve.

First, the problems of the conventional method will be described with reference to FIGS. 4 to 6.

Figure 4 is a plan view of the floppy disk IF get;
FIG. 5 is a developed plan view showing the inner surface of a semi-finished jacket sheet, and FIG. 6 is a sectional view showing an example of the punching process.

As shown in Fig. 4, the JAKERA hS has a rectangular sheet 2 with an inner lining 3 made of textile material such as cloth or nonwoven fabric on one side of the rectangular sheet 2 as shown in Fig. 5. 2a, the front side piece 2b and the back side piece 2C are folded in half, and the pasting allowances 2d, 2e, 2f provided on the three sides of the front side 2b are pasted with the pasting allowances 2d, 20 on both sides. Like a bag-like shape, light prochiku l-notchi Δ, head window B, index window C, L! A central window D and a stress relief notch E are each provided by punching, and a floppy disk can be inserted from the 2" side and sealed.

Using a female mold 6 with a punch hole 5 corresponding to
However, if the cut is not completely cut, there will be fuzz, protrusions, etc. on the cut end. This fluff, etc. 32 later turns into dust and rotates at the same time as the disk W, causing errors during recording and reproduction. Particularly in the part C of the head window D, it is necessary to completely prevent the occurrence of fluff, etc., since a small amount of dust C can cause an error.

The present invention solves the above problems and solves the above problems.
A lining made of fiber material 1 was provided on the surface, and required holes were punched in the Nibras deck 1 by applying a DC high voltage to the periphery of the lining and cutting the lining [Part 11]. toward the hole
This relates to a method for processing a punched hole in a di-V cut for a floppy disk, which is characterized by heating the protruding portion to avoid melting and shrinkage of the protruding portion.

The present invention will be explained below with reference to FIGS. 1 to 3.

Figures 1 and 2 are cross-sectional views of the punched hole treatment process according to the present invention, and Figure 3 is a cross-sectional view of the punched hole C after the punched hole treatment process has been completed.
be.

As described above, the inner lining 3 is provided on the sheet 2, and the inner lining 3 is punched out using, for example, a punching device not shown in FIG. 6 to form the required holes. In FIG. 6, the holes are punched out by folding the two side pieces 2+1.2G, but this may be punched out before folding the both sides (in the state shown in FIG. 5). This semi-finished product ;L
! J'' is held between the push plate 7 and the receiving mold 8 shown in FIG.

Holes are provided in the push plate 7 and the receiving mold 8 at positions corresponding to the holes in the semi-finished product described above, but in this example, d3 is used only for boxes 7D and 8D, which correspond to sensor 1-full window D. It is shown.

Above the hole 7D, a heating mold 9 having a diameter slightly smaller than that of the hintral window D is installed so as to be freely accessible and removable. It is set up C. In addition, the push plate 7
A child of a DC high voltage generator 11 is connected to the receiving mold 8, and one pole is connected to the heating mold 9. This 10-tiL reversed C is also good. With this device, a high DC voltage is applied to the periphery of the hole from before inserting the slit shown in Fig. 1 to immediately after inserting the slit shown in Fig. 2. The fuzz, etc. on the heating mold 9 is drawn in a line shape, and the protruding part 31 is melted and contracted in a manner of 5 (-1). .

The gap G between the inner peripheral surface of the pin 1 and the window D and the outer peripheral part of the heating mold 9 depends on the temperature of the heating mold 9, the applied voltage, the material of the lining 3, etc. J'F, I can't decide for sure, but for example (J, Sea 1-2 has a thickness of 2 and 0.25 mm.
carbon-F rack included] polyj product conversion 1-
1. When the lining 3 is made of 18 mm rayon unwoven fabric with a thickness of Q, the temperature of the heating 41149 is set to 800'C. If (), the gap 0 can be melted and shrunk to a good θY with a gap of 2.0 (2).

Generally, the temperature of the heating mold 9 is 4.00 to 1000°C, the applied voltage is 1.0 KV or more to a voltage lower than the voltage that causes sparks, the heating time is 0.1 to 1 second, and the gap G is 0.2 to 2. Qmm
If conditions are selected between these conditions, it is possible to perform a practically good punching hole treatment.

If this gap G is too narrow and the heating mold 9 comes into contact with the seam [-2, the same contact part of the seam 1-2 will be deformed and problems will occur.Also, if the gap G is large and the heating temperature is low, the fluff removal effectiveness decreases.

As mentioned above, the heating mold is inserted into the hole of the jitocket, and the protruding part 31 in the heated mold hole is thermally shrunk, resulting in a rounded area around the hole of the inner lining 3 as shown in FIG. Fuzz, etc. is fixed.

The above-mentioned push plate 7 and receiving mold 8 may be arranged so that the pushing plate 7 is movable and the receiving mold 8 is fixed, or vice versa.

The lower surface around the hole 7D and/or the hole 81. ) by setting a ridge on the upper surface of the peripheral part (the same applies to the other holes - By strongly suppressing the peripheral area, it is possible to improve the flow of the lining into the hole and improve the heat shrinkage of the same protruding part.In addition, in the case of mass production, heating the press plate 7 or mold E3 In order to prevent heat accumulation in the seams 1-2, measures such as flowing cooling water through them are used to prevent heat accumulation and warp deformation of the seams 1-2.

According to the present invention, fluff, protrusions, etc. generated in the holes punched in the sheet as described above can be made to sufficiently protrude inward by applying a DC high voltage to the sheet 1-. This protruding part can be easily melted and shrunk by inserting the H type into the hole and heating it, so the conventional problems can be easily solved. Susumu,
1-F Noh mask of the product, cost fl-t, and provided the good product to @Li (゛Saru 1q Invention C).

[Brief explanation of drawings]

Figures 1 and 2 are two culms according to the present invention. Figure 3 is an i-side view of the treated hole after the punching process has been completed. , Fig. 4 is a bottom view of the fu [tupee disc jisekerato], Fig. 5 is a jacket childbirth product sea 1 ~
FIG. 6 is a developed plan view showing the inner surface of the sheet, and FIG. 6 is a sectional view showing an example of the punching process. 2 is a sheet, 3 is a lining, 7 is a push plate, 8 is a receiving mold, 9 is a heating mold, and 11 is a DC high voltage generator. Game 6 B

Claims (1)

[Claims] After punching out the required holes in the lining made of fiber material 1 on one side, a DC high voltage is applied to the area around the hole, and the cut part of the lining is 1. A method for punching holes in a floppy disk jacket 1, which comprises melting and shrinking the protruding portion by heating in a state in which the protruding portion protrudes toward the hole.