JPS5910858B2 - Slide fastener - pressing method for janitorial teeth - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a processing method for punching and forming individually independent secretaries for a slide fastener from a flat metal wire material by press working, and it is possible to increase the engagement strength. To provide a method for economically manufacturing a secretary in which the engaging protrusion can be bulged sufficiently high and the wall thickness of the leg part can be made as thin as possible to improve the slidability of the slider. The purpose is

It is already known that there is a method for manufacturing individual metal secretaries by press working, which have engaging protrusions on both the front and back sides of the engaging head and are crimped onto the ends of the zipper tape at the legs. Representative 5: One manufacturing method involves directly molding the mating protrusions from the flat front and back surfaces of the flat wire, which necessitates increasing the wall thickness of the flat wire, resulting in the swelling of the protrusions. The degree of engagement is low, the engagement strength is small, and the wall thickness of the leg is equal to that of the flat wire material, and it is extremely thick.
0, the mounting pitch of the secretary has to be increased, and the resistance when the slider slides becomes large, which not only makes it impossible to achieve smooth sliding, but also lacks flexibility as a slide fastener, making it unnecessary. There are drawbacks such as the need to use a large amount of material.

15 On the other hand, if the thickness of the flat wire material is made thinner, the sliding resistance of the slider is reduced, and the flexibility of the slide fastener is ensured, the height of the protrusion of the engaging head will be lower and the engaging strength will be increased. Not only was the height lower, but the secretary's legs also lacked meat, resulting in a decrease in strength.

In addition, as other typical manufacturing methods, Fig. 8A and Fig. 8B
As shown in , there are protrusions a and b in the longitudinal direction of the center length of the front and back sides.
A flat wire material c with
, e is also known, but since only a single projection d, e is molded, the projections d, e
The excess thickness due to the regular weaving of the flat part molecule g between them tends to bulge out the sides of the flat wire c and make them l, causing the force and protrusions d and e to
It has drawbacks such as the periphery cannot be made thin, bulges out, and the degree of bulge of the protrusions d and e has to be low due to the restriction of reducing i to 90.

Furthermore, a method is known in which a flat secretary is gradually formed from round wire rods, but this method not only requires a large number of processing steps, but also requires the molded wire rod to be cut into individual secretaries35 before it is separated into individual secretaries. Unless you remove them from the press and separate them by feeding them in the opposite direction,
It has drawbacks such as not being able to adhere continuously to the ends of the fastener tape. i-C7 - The present invention provides a method of pressing a working tooth of a slide fastener without the above-mentioned drawbacks by having the structure described in the claims.

The configuration of the present invention will be described below with reference to illustrated examples.

As shown in FIGS. 1 and 2, the present invention uses a metal flat wire 1 as a raw material, and a protrusion 2 is provided in the center of both the front and back surfaces along the length direction of the wire. , 3 are formed. In the present invention, as a first step, the engaging portions 5 of the interlocking teeth 4 shown in FIGS. 3 and 4 are formed on both the front and back surfaces of the flat wire rod 1, and then the outer shape 7 of the leg portions 6 is punched out. As a third step, the spaces between the adjacent engaging portions 5 and leg portions 6 are punched out to form individual interlocking teeth 4.

FIG. 5 is an enlarged plan view of the flat wire rod 1 in which the engaging portion 5 has been molded in the first step. The first protrusions 8 and 9 are perpendicular to the length direction of the wire rod 1, and the second protrusions 1 are continuous with the lower parts 10 and 11 on both sides and are substantially parallel to the length direction of the flat wire 1.
2 and 13, and an inner portion 14 surrounded by the aforementioned first and second projections 8, 12, and 13.
and outer peripheral parts 15, 16, 17 of both protrusions 8, 12, 13
and compared to the first projections 8 and 9,
The degree of swelling of the second protrusions 12 and 13 is made slightly lower, as is clear from FIG.

Further, the thickness H of the inner portion 14 and the outer peripheral portions 15, 16, 17 described above is thinner than the thickness h of the material of the portion of the flat wire 1 other than the protruding portions 2, 3. .

Further, the leg portion 6 of the connecting tooth 4 has a thickness equal to the thickness h of the material of the portion of the flat wire material 1 other than the protruding portions 2 and 3.

The mold used in carrying out the present invention is, of course, the same as a normal press mold, and includes the first and second protrusions 8,
It has concave portions corresponding to 9, 12, and 13, an inner portion 14, and a pressing surface portion corresponding to outer peripheral portions 15, 16, and 17, but the concave portion of the mold and the protrusion of the flat wire material 1 It is necessary to maintain the positional relationship with the strips 2 and 3 as shown in FIGS. 6A and 6B.

That is, the concave portions 20 and 21 in which the first protrusions 8 and 9 are to be formed in the molds 18 and 19 have their openings 22 and 23 directly facing the protrusions 2 and 3, and Concave portion 20
, 21 and where the second projections 12, 13 are to be formed, the recesses 24, 25, 26, 27 are also located at the openings 2.
8, 29, 30, 31 are provided at least in part at a position directly facing at least part of the protrusions 2, 3,
Moreover, the concave portions 20, 21 and the concave portions 24 to 27 have communication portions 32, 33, 34, 3 in two portions of the concave portions near the openings.
5.

However, on the outer circumference of the above-mentioned concave portions 20, 21, 24 to 27, there are press surface portions 36, 37, 38, 39, on which the inner portion 14 and outer circumferential portions 15, 16, 17 of the coupling teeth 4 are to be formed. 40,4
1 is formed.

In the present invention, press working is performed as the first step using the molds 18 and 19 having the above-described structure, and FIG. It shows the flow state. That is, as shown in FIG. 7A, since the concave portions 20 and 21 are directly opposed to the protruding portions 2 and 3, the inner portions of the protruding portions 2 and 3 and their surrounding areas are thinned. Part 1
4. The amount of material that should become the outer peripheral parts 15, 16, 17 easily flows into the recessed parts 20, 21. Further, as shown in FIG. 7B, the four concave portions 24 to 27 have openings 28 to 31.
At least a part of the ridges 2 and 3 are directly opposed to each other, so that the parts that should be the ridges 2 and 3, the inner part 14 and the outer peripheral parts 15, 16, and 17 to be made thinner are The amount of material flows easily into the recesses 20,21. As a result, even if each concave part is deep and there are many, the part that should be the leg of the connecting tooth 4 has
A complete molding can be achieved without causing excessive flow of excess material, and each molded protrusion becomes extremely strong due to work hardening and densification of the structure.

Next, as a second step, the flat portions 42 located on both sides of the above-mentioned shaped portion of the flat wire material 1 are punched out into the outer shape 7 of the leg portion 6, and as a third step, the flat portions 42 located on both sides of the above-mentioned shaped portion are punched out into the inner shape 43 of the leg portion 6. As a result, the connecting teeth 4 are separated into individually independent coupling teeth 4 shown in FIG. 1B and FIG. 3.

As shown in FIG. 1B, the bulging strips 45 on the side edges of the fastener tape 44 are inserted into the inner shape of the legs 6, and by caulking the legs 6, the fastening teeth 4 can be separated as described above. Continuously, the fastener 4 is attached to the fastener tape 44.

The method of the present invention has the above-described structure and operation, and uses the material of the protrusions on the front and back sides of a flat wire as the main material, and the inner part surrounded by the protrusions to be shaped; Using the amount of extra thickness when pressing the outer peripheral part of the protrusion to make it thin, a first protrusion perpendicular to the length direction of the flat wire material and a second protrusion approximately parallel to the length direction of the flat wire material are formed. The second protrusion is molded by plastic working, and the second protrusion is different from the first protrusion,
Since it is continuous at the bottom of both sides, there is a wide concave part where the material of the flat wire material, that is, the meat, can escape, allowing the meat to flow sufficiently without strain, and making it easy to remove the high protrusion. Can be molded.

Moreover, since the second protrusion swells slightly lower than the first protrusion, the amount of material can be used appropriately. As a result, the thickness of the flat part, which is the part other than the protruding stripes on the front and back sides of the flat wire, can be selected only from the viewpoint of strength as the leg of the connecting tooth, and is necessary for shaping the protruding part. There is no need to apply a certain amount of material to the flat part in advance, and there is almost no expansion of the flat part due to movement of excess material when molding the protrusion, so it is suitable for forming the legs. Various effects can be achieved, such as the amount of material removed can be kept to a minimum.

As mentioned above, it is only necessary to give the flat part of the flat wire the thickness that should be given to the leg part of the interlocking gear from the viewpoint of its strength, and the leg part is formed to match the thickness of the flat wire material. The legs have the minimum required thickness, the slider has good sliding properties, and has sufficient flexibility as a slide fastener.

[Brief explanation of drawings]

Fig. 1A is an enlarged plan view of an example of a flat wire rod that has undergone both the first and second processing steps, Fig. 1B is an enlarged plan view of the connecting teeth separated in the third process, and Fig. 2 is the same as Fig. 1. 3 is an enlarged slope view of the connecting tooth shown in FIG. 1B, and FIG.
Figure 5 is an enlarged plan view of a part of the fastener chain used in the fastener shown in the figure, Figure 5 is an enlarged plane view of the flat wire rod that has gone through the first step, and Figures 6 A and B are the flat wire rod and the mold. 7A and B are enlarged sectional views similar to those shown in FIG. 6 during processing, and FIG. 8A is an enlarged sectional view showing the positional relationship before processing.
FIG. 8B is an enlarged plan view showing the deformed state and processing state of the flat wire material in the conventional processing method, and is a right side view of FIG. 8A. 1...Flat wire rod, 2, 3...Protrusion portion, 4
...Muso 5...Meshing part, 6...
・Legs, 7... External shape of legs, 8, 9...
・First protrusion, 10, 11...Bottoms on both sides of the first protrusion, 12, 13...Second protrusion 14
...Inner part, 15-17...Outer peripheral part.

Claims (1)

[Claims] 1. A metal flat wire material with a protrusion along the length direction formed in the center of both the front and back sides, and as a first step, the first protrusion perpendicular to the length direction of the flat wire material and the lower part on both sides thereof. A second protrusion that is continuous, substantially parallel to the length direction of the flat wire rod, and swells slightly lower than the first protrusion is formed by plastic working using the material of the protrusion as the main material, and at the same time. , the inner part surrounded by both the first and second protrusions and the outer circumferential part of both protrusions are also press-molded to a thickness thinner than the thickness of the material of the flat wire, and the amount of excess thickness is also reduced. The first and second protrusions are molded to form the interlocking part of the interlocking tooth, and as a second step, the outer shape of the leg of the interlocking tooth is punched and formed on the flat part of the flat wire material, and then the third step is performed. A press processing method for slide fastener service teeth, which is characterized by punching individual service teeth as follows.