JPH0245267B2 - KIROKUDEISUKUYOJAKETSUTONOSEIZOHO - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a jacket for housing a recording disk, such as a magnetic disk made of synthetic resin or the like.

Taking the jacket of a magnetic disk as an example, a developed view of the jacket, that is, a plan view of the jacket before it has been finished into a bag shape, is shown in FIG. 1. That is, a nonwoven fabric 2 having a slightly smaller size than the plastic sheet 1 is attached to the inside of a hard plastic sheet 1 such as a hard vinyl chloride resin so as not to lose its flexibility. 4 is an opening for the drive shaft, 5 is an opening for inserting the magnetic head, and 6 is an opening for sector marking.The nonwoven fabric 2 is folded at the folding line 7 shown by the dotted line, with the layer of nonwoven fabric 2 inside. , the left and right openings 4, 5, and 6 overlap correctly. 3A, 3B and 3C are welding allowances, and first, bending lines 8A and 8
Fold and fuse welding margins 3A and 3B at point B to form a bag, store the magnetic disk in this bag, and finally fold welding margin 3C at folding line 8C.
By bending and fusing, a disk cartridge is completed.

The present invention relates to a recording disk jacket, and more particularly to a method characterized in the manufacture of a jacket up to the state shown in FIG.

Conventionally, to manufacture such a jacket, first,
A nonwoven fabric was cut to a fixed length as shown in 2 in Figure 1 and pasted onto a long plastic sheet or a plastic sheet cut into unit sizes, but the nonwoven fabric was flexible and stiff. It is also difficult to cut the nonwoven fabric because it expands and contracts, making it difficult to keep the cut dimensions constant, and furthermore, it is difficult to place the cut nonwoven fabric at an accurate position on the plastic sheet.

The present invention provides such operational convenience by adopting a laminating method in which the nonwoven fabric is supplied and laminated in a continuous strip without cutting it to a fixed length, and in addition, a portion 3C to which the nonwoven fabric is not laminated can be left. The purpose of the present invention is to provide a method for efficiently manufacturing a jacket for a recording disk by solving the above difficulties.

Hereinafter, the method of the present invention will be explained in detail in conjunction with the explanation of the accompanying drawings.

FIG. 2A is an explanatory diagram illustrating an example of a mode of carrying out the method of the present invention, and is a side view of the work being carried out continuously, and FIG.
FIG. 2 is an explanatory view showing only the plastic sheet and nonwoven fabric seen from above, corresponding to the view shown in FIG. A; Third
The figures are explanatory diagrams showing the cutting of a long nonwoven fabric placed on a plastic sheet, Figures 4 and 5.
FIG. 6 and FIG. 6 are explanatory diagrams illustrating the state in which the nonwoven fabric is cut.

In the figure, 10 is a plastic sheet, 11 is a plastic sheet container that stores a large number of stacked plastic sheets, and 12 is a container that supplies the plastic sheets in the container 11 one by one to a conveyor at regular intervals. 13 is a conveyor, 14 is a protrusion provided at regular intervals on the conveyor, 15 is a push roll that feeds the plastic sheets one by one to the next process, and 16 is a rotary seal machine that temporarily fastens the nonwoven fabric to the plastic sheet. , 17 is a non-woven fabric, 18 is a roll of non-woven fabric, 19 is a rotary cutter, 20 is a cutter blade, 21 is a punching blade for making a pinhole for a guide pin, 22 is a temporary fixing of the non-woven fabric on the top surface 23 is a heat sealing machine that seals the nonwoven fabric 17 on the top surface of the plastic sheet 10;
24 is a large number of protrusions provided on the heat sealing machine 23 for heat sealing, 25 is a crank mechanism that moves the heat sealing machine 23 up and down, 26 is a guide pin, 27 is a stopper, 28 is a guide pin, 26
A stopper 27 is a crank mechanism that moves up and down, 29 is a conveyor that sends the plastic sheet 10 to the next process, and 30 is a machine that cuts the plastic sheet with a non-woven fabric pasted onto the top surface into a predetermined shape, and also punches out the opening of the jacket at the same time. 31 is a guide pin, 32 is a crank mechanism that moves the punching press 30 up and down, 33 is a stacking table for punched sheets, and 34 is a transfer machine for transporting the punched sheets to the stacking table 33. , 35
is the guide pinhole.

Next, a mode of carrying out the method of the present invention using the above-mentioned apparatus will be explained.

Plastic sheet 1 cut to a certain size
A large number of sheets 0 (hereinafter simply referred to as sheets 10) are stacked and stored in a container 11, and these sheets are successively pushed upward, and the uppermost sheet is conveyed to a conveyor 13 at regular intervals by a feeder 12. sent upwards. Each sheet 10 has a length and a dimension that is greater than or equal to the length and width of the unfolded surface when the bag-shaped recording disk jacket is unfolded, and is up to a range slightly larger than these dimensions, that is, the first
The dimension shown by the dashed line S in the diagram or slightly larger dimension should be used (particularly, a slightly larger dimension in the longitudinal direction is preferable for operation), and the longitudinal direction should be the same as the traveling direction of the sheet 10. .
Furthermore, when feeding the sheet 10 to the conveyor 13, the feeder 13 places the front end of the sheet 10 to be sent out next so that it overlaps the rear end of the preceding sheet 10.
2 will be sent out. Figure 2A
shows the overlapping state of the ends of the sheets 11, but if the mutual overlapping state of the ends is the opposite, that is, the rear end of the preceding sheet 10 overlaps the front end of the following sheet 10. You can also stack them on top of each other. The conveyor 13 has protrusions 1 at predetermined intervals.
4 is provided, and the sheet 10 is transferred while being pushed by this protrusion 14 to keep the overlapping degree of the front and rear sheets constant.

In this state, the sheets 10 are conveyed by the conveyor 13 while maintaining the degree of overlap so as not to change significantly, and are sent to the rotary sealing machine 16 by the push roll 15. At the same time, a nonwoven fabric 17 unwound from a roll 18 wound with nonwoven fabric is continuously fed into the rotary sealing machine 16 so as to ride on the sheet 10, and heated projections provided on the rotary sealing machine 16 , temporarily fastened. This is to prevent the sheet 10 and the nonwoven fabric 17 from being misaligned with each other, and by simply passing the protrusions of the sealing machine 16 through the sheet 10 at several decimal places as appropriate. good. The width of the nonwoven fabric fed here is substantially the same as the width of the nonwoven fabric 2 shown in FIG.

The temporarily fastened sheet 10 and nonwoven fabric 17 are
Next, it is sent to the rotary cutter 19, and the blade 20
The nonwoven fabric is cut, and at the same time, the punching blade 21 punches a pinhole 35 for a guide pin.

The cutting situation of the nonwoven fabric is shown in Figure 3.
At the same time as cutting the nonwoven fabric 17, the end portion of the sheet 10 that rests on the overlapping portion of the end portion of the sheet 10 is also cut. In this case, it is necessary to make the length of the sheet 10 slightly larger. Note that it is not necessary to cut only the nonwoven fabric and not cut the ends of the sheet.

In addition, the way in which adjacent sheets 10 overlap at each end is as shown in FIG.
As mentioned above, it may be either the case where the vertical relationship is reversed (i.e., the case where the trailing edge of the preceding sheet overlaps with the leading edge of the succeeding sheet),
In the latter case, the only difference is that the nonwoven fabric is cut at the rear end of the preceding sheet at the same time.
As a result, in this case, a portion where the nonwoven fabric does not overlap is formed at the leading end of the succeeding sheet, and this portion becomes the welding margin when the jacket is finally made. Third
In the case shown in the figure, seat 10 (viewed in the direction of travel)
The rear end will be the welding margin.

As shown in FIG. 2B, the punching positions of the rotary cutter 19 by the punching blade 21 for forming guide pin holes are on both sides of the nonwoven fabric, where the nonwoven fabric does not overlap (finally, the punching press 30 It is best to use the cut-off part (the part that is cut and removed by the process). Although the number is not particularly limited, it is usually preferable to have two on each side as shown in the figure. Instead of this pinhole, a notch may be provided on the side edge of the sheet 10.

This process of cutting the nonwoven fabric and forming guide pinholes can be performed while intermittently transporting the sheet 10 and the nonwoven fabric 17 (that is, cutting the nonwoven fabric when stopped), but the degree of overlap between the sheets 10 may be In order to keep the tension constant and to minimize tension fluctuations in the nonwoven fabric, it is preferable to carry out the process while continuously transporting the sheet 10 and the nonwoven fabric 17 without stopping.

In the case of intermittent transfer, a normal vertically movable cutter can be used as the cutter. Furthermore, in the case of continuous transfer, a so-called swinging cutter or the like may be used in addition to the rotary cutter.

The material that has undergone the above processing by the rotary cutter 19 is sent by a conveyor 22 to a heat sealing machine 23, where the sheet 10 and the nonwoven fabric 17 are sealed. This is the previous rotary seal machine 1.
6, the nonwoven fabric 17 is attached to the sheet 10.
For example, thin needle-like protrusions that are evenly distributed over the entire surface are heated to a high temperature, and the plastic of the sheet 10 is melted at the tips of the protrusions and bonded to the nonwoven fabric. let Further, as shown in FIG. 1, the seat has an opening 4 for driving and an opening 5 for inserting the magnetic head.
And sector marking openings 6 are punched out in a later step. It is also advisable to weld the vicinity of the outer peripheral edge of the corresponding portion to be punched out using a hot stamp type welding device.

In the heat sealing machine 23, the sheet 10 is stopped by a stopper 27, and the guide pin 26 is
Guide pinhole 3 formed in the sheet 10
5 is penetrated, and the sheet 10 is held at that position and heat-sealed.

The sheet processed by the heat sealing machine 23 is conveyed by a conveyor 29 to a punching press 30, where the final shape, i.e., the outer shape and each opening are punched out, as shown on the rightmost side of FIG. 2B. It is done. In order to perform this punching correctly, the sheet 10 is held at a position where the guide pin 31 passes through the guide pin hole 35 formed therein.

In this way, a sheet having the shape shown in FIG. 1 and laminated with nonwoven fabrics is obtained. This material is collected on a collection table 33 by a transfer device 34, and then bent and welded to form a jacket as described above.

According to the method of the present invention, by supplying the sheets 10 with their ends overlapped with each other, a jacket material having a portion 3C where the nonwoven fabric is not bonded can be obtained using a continuous strip of nonwoven fabric.

Therefore, the difficulties caused by pre-cutting the non-woven fabric to a fixed length are eliminated, and smooth operation becomes possible.

Further, since the nonwoven fabric 17 is cut while being temporarily fixed on the sheet 10, cutting is accurate and easy, and a clean piece without fluff can be obtained.

Next, as a particularly preferred embodiment of the present invention, the effect of providing guide pinholes and the like will be explained.

In the jacket of a recording disk, as shown in FIG. 1, the shape and dimensions of the sheet, the dimensions of the nonwoven fabric, the position of the nonwoven fabric bonded to the sheet, and the positions of each opening must be maintained accurately.
For this reason, in the method of the present invention, it is preferable that a guide pin hole is made in the sheet, and each process is performed at a position where the guide pin is passed through the hole. For example, the sheets 10 are fed from the sheet feeder 12 onto the conveyor 13 while creating an overlapping portion between the ends of adjacent sheets.
When fed from the conveyor 13, there is a possibility that the length of the stacked portion may vary slightly. Even if such fluctuations occur, no problem will occur in the method of the present invention. This will be explained in FIGS. 4, 5 and 6. Note that FIGS. 4 to 6 show cases in which the overlapping state is opposite to that in FIG. 2, and the dimensions are exaggerated for easy understanding. It is assumed that a product with a long stacked portion as shown in FIG. 4A and a product with a short stacked portion as shown in FIG. 4B are transferred. These are all cut by the rotary cutter 19 at the locations indicated by arrows a. Then, the sheet on the left side of FIG. 4a has a large length of the non-overlapping part b of the nonwoven fabric as shown in FIG. 5a, while the sheet on the left side of FIG. The length of the stacked portion b becomes small. However, since the blade 20 that cuts at point a in Figure 4 and the blade 21 that punches out the guide pinhole are provided on the same rotary cutter 19, that is, the distance C for both A and B in Figure 5 is They are the same length. (That is, it is equal to the circumferential length between the blades 20 and 21.) That is, the longer the length b in FIG. 5A is, the more the guide pin hole 35 will be positioned to the left. Therefore, when punching is performed using the punching press 30, if the punch is punched at a position where the guide pin 31 is penetrated by the guide pin hole 35, the punching blade is provided at a position based on the position of the guide pin 35. , the lengths indicated by d and e in Fig. 6, A and B are the same, (d is the total length in the longitudinal direction of the finished sheet, e is
is the length from the guide pinhole to the end of the nonwoven fabric), and the length of the part f, which is the welding margin, is also the same.
In FIG. 6, the shaded portion is the portion to be cut and removed.

In this way, according to the method of the present invention, desired dimensions and shapes can be obtained consistently and efficiently.

What has been explained above and shown in the drawings are typical examples to help understand the present invention, and the present invention is not limited to these examples.
Other changes and modifications may be made within the scope of the invention.

[Brief explanation of the drawing]

Figure 1 is a developed view of the magnetic disk jacket.
FIG. 2A is an explanatory diagram illustrating an example of an embodiment of the method of the present invention, FIG. 2B is an explanatory diagram showing only the plastic sheet and nonwoven fabric seen from above, corresponding to the diagram shown in FIG. 2A, FIG. 3 is an explanatory diagram showing a state in which a long nonwoven fabric placed on a plastic sheet is cut in the method of the present invention, FIGS.
FIG. 6 and FIG. 6 are explanatory diagrams illustrating the state in which the nonwoven fabric is cut. In the figure, 10 is a plastic sheet, 12 is a plastic sheet feeder, 13 is a conveyor, 15
1 is a push roll, 16 is a rotary seal machine,
19 is a rotary cutter, and 23 is a heat sealing machine.

Claims (1)

[Scope of Claims] 1 (a) Length and width dimensions that are equal to or greater than the length and width of the unfolded surface when the bag-shaped recording disk jacket is unfolded, and that are slightly larger than these dimensions. A plastic sheet made of
and sequentially transport the plastic sheet so that the rear end of the preceding plastic sheet and the front end of the following plastic sheet overlap, (b) supply and overlap the belt-shaped nonwoven fabric on top of the transported plastic sheet, and ( c) Temporarily fasten the plastic sheet and non-woven fabric; (d) fix the non-woven fabric or the plastic sheet above the overlap between the non-woven fabric and the plastic sheet near the end of the plastic sheet above the overlap of the plastic sheets; (e) Paste the cut nonwoven fabric with the overlapping plastic sheet, (f) punch out the pasted material to give it an external shape that matches the jacket development surface, and forming an opening.