JPH03156781A - Floppy disk jacket and its manufacture - Google Patents

Abstract

PURPOSE:To prevent deformation of a floppy disk due to heat attended with welding by using a welding head with a cushion member arranged thereto so as to apply welding. CONSTITUTION:A flap 8 is welded to an ultrasonic wave head corresponding to the position of a middle part 8b of the flap 8 by using a mechanism 13 arranged with a cushion member 15. That is, when the middle part 8b arranged with a floppy disk 2a is welded, it is implemented via a cushion member 15 to decrease the strength of the welding and a welding part having no trace of welding is formed. Thus, even when a jacket 3 is expanded due to heat, the bonding of a tip 6a of other surface 6 with the flap 8 is kept and it is prevented that the tip 6b is descended and abutted against the floppy disk 2a. Thus, deformation of the floppy disk 2a is prevented.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a floppy disk jacket comprising a disk-shaped floppy disk (magnetic recording medium) and a jacket for storing the floppy disk therein, and a method for manufacturing the same. It is related to.

In this specification, the term floppy disk refers to a single disk, the term jacket refers to a single jacket, and the term floppy disk jacket refers to a combination of the floppy disk and jacket.

(Prior Art) A bag-shaped jacket made of a flexible material is widely used as a jacket for storing a disc-shaped floppy disk. As shown in FIG. 8, the jacket 3 of the floppy disk jacket 1 has a square shape with sides approximately equal in length to the diameter of the disc-shaped floppy disk 2a, and when the floppy disk 2a is stored, both ends of the jacket 3 are A space 4 in which the floppy disk 2a is not accommodated is formed at the four corners of the space. That is, in the floppy disk jacket 1 having such a jacket 3, a rectangular jacket material in which two surface portions 5 and 6 are integrally continuous is folded in a mountain shape at the longitudinal center and overlapped. A nonwoven fabric 2b and a floppy disk 2a are stored between the surface parts 5 and 6,
A folding flap 8 formed on the outer periphery of one surface portion 5 is folded over the edge of the other surface portion 6, and this folding flap 8 and the edge of the other surface portion 6 are ultrasonically welded. A floppy disk jacket 1 is formed.

Further, the welding is performed by ultrasonically welding the flap 8 and the other surface portion 6 in the space 4 of the non-accommodating portion of the floppy disk 2a, so that only both ends of the flap 8 are welded. It was something.

(Problem 8 to be solved by the invention) However, in the jacket 3 in which welding is performed only at both ends of the folding flap 8, the central portion in the longitudinal direction of the folding flap 8 is welded to the other surface portion 6. Because it is not fixed, it tends to float up, which has the disadvantage that the floating part tends to get caught on the drive device when inserting the drive device. Furthermore, as shown in FIGS. 6 and 7, the other surface portion 6 and the flap 8 are horizontally joined at normal room temperature (FIG. 6), but the heat resistance temperature of the jacket 3 is Under the above environment, the entire jacket 3 swells, and as shown in FIG. 7, the other surface portion 5 becomes arcuate, and the tip portion 6b shifts downward from the contact position with the flap 8, and comes into contact with the floppy disk 2a. This could lead to negative effects.

To solve such problems, Utility Model Application No. 58-1185
There is a floppy disk jacket shown in Japanese Patent No. 74, in which ultrasonic welding is performed at multiple points over the entire length of the flap. However, as mentioned above, the ultrasonic welding of the flap and the other surface is performed with the floppy disk placed inside the jacket, so especially when welding the center part of the flap, the floppy disk is inside the welded area. This is not preferable because the floppy disk may be deformed by the heat accompanying ultrasonic welding.

In view of the problems described above, the present invention aims to provide a floppy disk jacket in which the two surface parts of the jacket are reliably welded together without adversely affecting the floppy disk.

(Means for Solving the Problems) A floppy disk jacket of the present invention includes a disc-shaped floppy disk and a bag-shaped jacket for storing the floppy disk therein. a floppy disk jacket, the floppy disk jacket having a surface portion, a bending flap being provided on the outer periphery of the one surface portion, and the bending flap being folded back and welded to the edge of the other surface portion. The welding of the folding flap is performed at both ends of the folding flap, and the welding is carried out at the center portion to such an extent that no welding marks are left on the surface of the folding flap.

Note that the welding in the central portion of the bending flap may be performed at a plurality of locations, or may be performed at one location.

In manufacturing such a floppy disk jacket, it is preferable to weld the center portion of the folded flap without leaving any welding marks by attaching a cushioning material to the ultrasonic welding head and pressing the cushioning material against the welding location.

(Function) As described above, in the floppy disk jacket of the present invention, the bending flap is welded to the other surface not only at both ends but also at the center. Therefore, the problem of the center part of the folded flap lifting up and getting caught by the drive unit when inserted into the drive unit is solved, and the entire jacket expands in an environment exceeding the heat-resistant temperature of the jacket. Even if such a situation occurs, the problem of the tip of the edge of the other surface of the jacket facing the center portion of the flap coming into contact with the floppy disk is solved.

Further, since the welding at the center of the flap is performed to such an extent that no welding marks are left on the flap surface, the problem of deformation of the floppy disk located inside the center of the flap due to the heat during welding can be solved.

Further, by performing welding using a welding head provided with a cushioning material, it is possible to suitably perform welding without adversely affecting the floppy disk in the jacket and leaving no welding marks.

(Embodiment) An embodiment of the floppy disk of the present invention will be described below with reference to the drawings. Note that parts having the same functions as those in the conventional example will be described with the same numbers as those in the conventional example.

As shown in FIG. 8, the floppy disk jacket 1 includes a disk-shaped floppy disk 2a and a pair of nonwoven fabrics 2b, 2b, which are disposed above and below the floppy disk 2a and have a substantially similar square shape to the jacket 3. is housed in a flexible square bag-shaped jacket 3, and is used by being loaded into a drive device (not shown).

Since the diameter of the floppy disk 2a and the length of one side of the jacket 3 are approximately the same, spaces 4 are formed at the four corners of the jacket 3 where the floppy disk 2a is not accommodated.

The jacket 3 is made up of two substantially identical surface portions 5 and 6 which are overlapped in a bag-like manner. That is, the two surface parts 5, 6
It is formed by stacking a rectangular jacket material in which continuous rectangular jackets are mountain-folded at the center in the longitudinal direction, and the mountain-fold line part 7 is the bag bottom, and the other three
The sides are bound by a folding flap 8 formed on the outer periphery of one surface portion 5.

That is, on the outer periphery of the other three sides of one surface part 5, a folding flap 8 having a trapezoidal shape with each side as a base is integrally formed with one surface part 5, and the one surface part 5 and the other surface part 5 are connected to each other. After the floppy disk 2a is inserted into a predetermined position between the floppy disk 2a and the front surface 6, the flap 8 is folded up onto the edge of the other surface 6, and the flap 8 is folded up onto the edge of the other surface 6. The edges of jacket 2 are bound in such a way as to wrap around the jacket. At this time, since the flap 8 has a trapezoidal shape,
The corner portions of the flaps 8 do not overlap.

This flap 8 and the other surface portion 6 are welded together by ultrasonic welding. This welding will be explained using one of the flaps 8 as an example in FIG.

In the space 4 at both ends 8a of the flap 8 where the floppy disk 2a is not accommodated, the flap 8 and the other surface portion 6 are welded by general ultrasonic welding. As shown in FIG. 2, the cross section of this ultrasonic welding part 1O is such that the welding is carried out by pressing the welding ultrasonic head from above the flap 8, so that the surface of the flap 8 and the welded part of the other surface part 6 are made of non-woven fabric. It caves in to the 2b side.

Further, also at the central portion 8b of the flap 8, the flap 8 and the other surface portion 6 are ultrasonically welded. Since the floppy disk 2a is housed in the jacket 3 of the central portion 8b, it is necessary to perform welding without leaving any welding marks so as not to adversely affect the floppy disk 2a. That is, welding that causes a depression like the welded part IO shown in FIG. 3 is not preferable, and it is necessary to perform welding that does not cause a depression like the welded part 11 shown in FIG. Therefore, the ultrasonic head mechanism 1 for welding shown in FIG. 4A
3, general ultrasonic heads 14.14 for welding both ends 8a of the flap 9 are arranged at positions corresponding to both ends, and the ultrasonic head at a position corresponding to the central part 8b of the flap 8 is provided with a cushioning material. It is appropriate to carry out the welding of the flaps 8 using a mechanism 13 in which a mechanism 15 is provided. That is, as shown in FIG. 4B, when welding the central portion 8b where the floppy disk 2a is disposed, the welding strength is reduced by welding through the cushion material 15, and the welding shown in FIG. It is possible to form a welded part 11 without any welding marks like the part 11. Therefore, the other surface portion 6 does not protrude toward the nonwoven fabric 2b, so that not only the appearance is not spoiled but also the floppy disk 2a is not adversely affected.

In this way, since the central portion 8b of the flap 8 is also completely welded to the other surface portion 6, as shown in FIG.
Even if the jacket 3 expands due to heat, the tip 6a of the other surface portion 6 remains connected to the flap 8, and the tip 6b does not descend and contact the floppy disk 2a.

Table 1 shows the relationship between the welding strength of the central portion 8b, the degree of peeling, and the appearance.

Table 1 The degree of peeling in this table indicates the ease with which the folded flap and the other surface part peel off when the jacket is twisted, and the appearance indicates the smoothness of the welded surface. If the welding strength is less than 1009, the flap and the other surface will easily peel off, and if it is more than 5009, welding marks in the form of dimples will remain on the welded surface, which will spoil the appearance. Therefore, the welding strength is preferably within the range of 1009 to 500g. 20
The most appropriate amount is about 0g to 4009g.

(Effects of the Invention) In the present invention, since welding is performed to the extent that no welding traces are left even at the center of the folded flap of the jacket, there is an inconvenience that the floating part of the center of the flap gets caught in the drive device when the drive device is loaded. In addition, even if the jacket thermally expands, the tip of the edge of the other surface facing the center of the flap will bend inward of the jacket and come into contact with the floppy disk stored inside. It can be prevented.

Further, since the welding at the center of the flap is performed to such an extent that no welding marks are left on the flap surface, the problem of deformation of the floppy disk located inside the center of the flap due to the heat during welding is also solved.

Furthermore, by performing ultrasonic welding using an ultrasonic head equipped with cushioning material, it is possible to simultaneously weld high-strength welds on other parts, while also reliably and easily welding weak-strength welds without traces as mentioned above. can be done.

[Brief explanation of the drawing]

Fig. 1 is a plan view illustrating one embodiment of welding of flaps in a floppy disk jacket of the present invention, Fig. 2 is a sectional view taken along the line ■-■ in Fig. Figure 4A is a cross-sectional view showing an example of the welding head that performs the welding of the above embodiment, Figure 4B is a welding head taken using the head shown in Figure 4A. Figure 5 is a cross-sectional view showing the state of the floppy disk jacket shown in Figure 1 during thermal expansion; Figure 6 is a cross-sectional view of a conventional floppy disk; A sectional view showing the state of the floppy disk jacket during thermal expansion. FIG. 8 is a partially sectional perspective view showing an example of the floppy disk jacket. DESCRIPTION OF SYMBOLS 1... Floppy disk jacket 2a... Floppy disk 3... Jacket 5... One surface part 6... Other surface part 8... Bending flap 10... Welded part 11... Welded area with no welding marks 15... Cushion material Figure 4A Figure

Claims (3)

[Claims] (1) comprising a disc-shaped floppy disk and a bag-shaped jacket for storing the floppy disk therein, the jacket having one surface portion and the other surface portion;
A floppy disk jacket is provided with a bending flap on the outer periphery of the one surface, and the bending flap is folded back and welded to the edge of the other surface, the welding of the bending flap comprising: A floppy disk jacket characterized in that the welding is performed at both ends of the folding flap, and the welding is carried out at the center portion to such an extent that no welding marks are left on the surface of the folding flap. (2) Welding at the center of the bending flap is 1
2. The floppy disk jacket according to claim 1, wherein the floppy disk jacket is formed at one or more locations. (3) A disk-shaped floppy disk and a bag-shaped jacket for storing the floppy disk inside, the jacket having one surface portion and another surface portion, and the outer periphery of the one surface portion. A method for manufacturing a floppy disk jacket, wherein a folding flap is provided on the other surface part, and the folding flap is folded back and welded to the edge of the other surface part, the welding of the folding flap being carried out at both ends of the folding flap. and a central part by ultrasonic welding, and the welding in the central part is performed by pasting a cushioning material on an ultrasonic head for welding and pressing the cushioning material against the welding part. Production method.