JPH0928414A - Manufacture of sole and manufacturing device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a sole for which the boundary of respective raw materials after press forming is externally good even at the time of press forming more than two kinds of the rubber raw materials of different quality and integrating them to a sole shape. SOLUTION: In this manufacturing method of the sole 32, more than two kinds of the sheet-like rubber raw materials of the different quality are respectively punched to a prescribed shape by punch dies 22a and 22b and then, the respective punched rubber raw materials 21a and 21b are press formed and integrated to the sole shape by a forming die 24 provided with projecting and recessed parts 23 which are the approximate inverse of the projected and recessed parts 31 on the back surface of the sole at the time of completion. At the time, the punch dies 22a and 22b are provided with the projecting and recessed parts 27a and 27b which are the approximate inverse of the projected and recessed parts on the back surface of the sole at the time of completion, the projecting and recessed parts 28a and 28b approximately the same as the projecting and recessed parts on the back surface of the sole at the time of completion are formed on the punched rubber raw materials 21a and 21b and then, press forming is performed while the projecting and recessed parts 28a and 28b of the rubber raw materials 21a and 21b are fitted to the projecting and recessed parts 23 of the forming die 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a shoe sole and an apparatus for manufacturing the same, and more specifically, it punches two or more kinds of rubber materials having different materials into a predetermined shape and then press-molds them to integrate them into the sole shape. TECHNICAL FIELD The present invention relates to a method of manufacturing a shoe sole that is made into a material and a manufacturing apparatus thereof.

[0002]

2. Description of the Related Art In general, a shoe sole of an athletic shoe is formed with a groove having a predetermined pattern for slip prevention, and in recent years, the shoe sole tends to have a multicolored design. There is press molding as a typical method of molding this shoe sole.
A method of punching a sheet-shaped rubber material with a punching die and then press-molding it with a molding die is the mainstream method for molding a rubber shoe sole because of its simplicity.

Conventionally, multicolor shoe soles have been manufactured in the following manner. Hereinafter, it will be described in detail based on a conventional example of a two-color shoe sole.

First, as shown in FIG. 2, a rubber material 2a, 2b having a predetermined shape (a shoe sole shape is formed by joining the two materials) with a two-color sheet-shaped rubber material is punched out by punching dies 1a, 1b, respectively. Punch out. Punching dies 1a, 1
b is a main body portion 4 whose inner top surfaces are flat surfaces 3a and 3b.
It has a structure in which blade portions 5a and 5b are provided on the outer circumferences of a and 4b. Therefore, the rubber materials 2a and 2b punched by the punching dies 1a and 1b have flat surfaces 6 with a substantially uniform thickness.
a and 6b.

After punching out the rubber materials 2a and 2b, these two rubber materials 2a and 2b are set in the molding die 7. The molding die 7 has a shoe sole-shaped recess 9 in which unevenness 8 that is substantially inverted from the unevenness 12 on the bottom surface of the finished shoe sole is formed on the mounting surfaces of the rubber materials 2a and 2b. When the two rubber materials 2a and 2b are press-molded by the molding die 7, the two rubber materials 2a and 2b are joined and integrated to obtain the shoe sole 11 having the unevenness 12 formed on the back surface thereof.

[0006]

By the way, there are various patterns on the unevenness 12 on the back surface of the shoe sole 11 described above, and these patterns have the rubber material 2 having a substantially uniform thickness.
It is formed by press forming a and 2b.
Even with one sole 11, there are differences in the depth of the groove due to the unevenness 12 depending on the location. In this case, there is no problem as long as the material of the sole 11 is uniform, but if the sole 11 is made of two or more kinds of rubber materials (two-color rubber material) whose materials are partially different, Problems arise.

Two rubber materials 2a, 2b which are manufactured by the punching dies 1a, 1b and have a substantially uniform thickness.
After being punched out, it is press-molded by a molding die 7 to be integrated into a shoe sole shape. At this time, a deep groove is formed in the shoe sole 11 at a portion where the irregularities 8 of the molding die 7 are large. A shallow groove is formed in the sole 11 at a portion where 8 is small. In this way, at the place where a deep groove is formed in the shoe sole 11, the shoe sole 11 becomes thin and excess rubber material flows into other places, and conversely, in the shallow groove in the shoe sole 11. At the location where the is formed, the shoe sole 11 becomes thick, and excess rubber material easily flows from other locations. As a result, the boundary 13 between the two color rubber materials 2a ′ and 2b ′ has, for example, a wavy shape, and there is a problem that a good appearance of the shoe sole 11 cannot be obtained and the commercial value is significantly reduced.

Therefore, the present invention has been proposed in view of the above problems, and an object of the present invention is to integrate two or more rubber materials having different materials into a sole shape.
It is an object of the present invention to provide a method for manufacturing a shoe sole and a manufacturing apparatus for the same, in which the boundaries between the respective rubber materials make the appearance of the shoe sole good.

[0009]

As a technical means for achieving the above object, the method of the present invention is one in which two or more kinds of sheet-shaped rubber materials having different materials are punched into a predetermined shape by a punching die, and then, A method for manufacturing a shoe sole, comprising press-molding each punched rubber material with a molding die having an unevenness that is substantially the reverse of the unevenness of the bottom surface of the shoe sole at the time of completion to form a shoe sole shape. The unevenness that is almost the reverse of the unevenness of the bottom of the shoe sole at the time of completion is provided, and after forming the same unevenness as the unevenness of the back surface of the shoe sole at the time of completion, the unevenness of the rubber material is formed on the unevenness of the molding die. It is characterized in that it is press-molded with the irregularities fitted.

Further, the device of the present invention has a punching die for punching two or more kinds of sheet-shaped rubber materials different in material into a predetermined shape, and a concavo-convex shape that is substantially the reverse of the concavo-convex shape on the bottom surface of the sole when completed. A shoe sole manufacturing apparatus comprising a molding die that press-molds each rubber material punched by a die to integrate it into a shoe sole shape, wherein the punching die has substantially the same unevenness on the bottom surface of the shoe sole when completed. It is characterized by having inverted irregularities.

The punching die is provided with a hole for discharging excess rubber to the outside in a blade portion provided on the outer periphery of the die body in which irregularities which are substantially inverted from the irregularities on the bottom surface of the shoe sole when completed are formed. It is desirable to be one.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A case in which the present invention is applied to a multicolor sole such as an athletic shoe, particularly a two-color sole, will be described below.

As shown in FIG. 1, according to the present invention, punching dies 22a and 22b for punching two kinds of sheet-shaped rubber materials having different materials into a predetermined shape (by joining the two to form a substantially sole shape), Concavity and convexity 3 on the back of the shoe sole when completed
1. The punching die 22 has the unevenness 23 almost inverted from
Each rubber material 2 with a predetermined shape punched out by a and 22b
A molding die 24 for press-molding 1a and 21b to integrate into a shoe sole shape is prepared.

The punching dies 22a and 22b have body portions 26a and 26b formed on their inner top surfaces with irregularities 27a and 27b which are substantially inverted from the irregularities 31 on the bottom surface of the shoe sole when completed.
Blade portions 25a, 25b are provided on the outer circumferences of the body portions 26a, 26b.
It has a structure in which is provided integrally or separately. Therefore, the rubber material 2 punched by the punching dies 22a and 22b
As will be described later, 1a and 21b are provided with unevennesses 28a and 28b which are substantially the same as the unevenness 31 on the back surface of the shoe bottom when completed.

The punching dies 22a and 22b are provided with blade portions 25a and 25b provided on the outer circumferences of the main body portions 26a and 26b.
In addition, it is preferable that holes 29a and 29b for discharging extra rubber to be externally formed. In addition, the unevenness 2
Body portions 26a and 26b having blades 7a and 27b and blade portion 2
If separated from 5a and 25b, the unevenness 27a and 27
Even if the pattern of b is changed, the main body 26
Since it is only necessary to replace a and 26b, it is easy to support the product type. On the other hand, in the molding die 24, as in the conventional case, the unevenness 3 on the rear surface of the shoe bottom when completed is placed on the mounting surface of the rubber materials 21a and 21b.
1. A shoe sole-shaped concave portion 3 in which unevenness 23 substantially inverted from that of 1 is formed
Has zero.

A two-color shoe sole is manufactured in the following manner by using the manufacturing apparatus including the punching dies 22a and 22b and the molding die 24.

First, as shown in FIG. 1, two color rubber materials are punched into the rubber materials 21a and 21b having a predetermined shape by the punching dies 22a and 22b. As described above, since the punching dies 22a and 22b have the irregularities 27a and 27b that are almost the reverse of the irregularities 31 on the bottom surface of the shoe sole when completed,
When the rubber materials 21a and 21b punched out by the punching dies 22a and 22b are joined, the unevennesses 28a and 28b which are substantially the same as the unevenness 31 on the back surface of the shoe bottom when completed are formed. At this time, if the rubber material before punching is made thicker, when the punching dies 22a and 22b are pressed against the rubber material, the upper surface of the rubber material is not immediately cut by the blade portions 25a and 25b. Concavities and convexities 28a and 28b are formed on the blades, and the blade portions 25a and 25b
rubber material 21a, 21b cut into a predetermined shape by b
Is obtained.

Here, the unevenness 2 is formed on the rubber materials 21a and 21b.
By forming 8a and 28b, excess rubber material generated during punching is discharged to the outside from holes 29a and 29b formed in the blade portions 25a and 25b of the punching dies 22a and 22b. Incidentally, the holes 29a of the blade portions 25a, 25b,
The rubber material 21a, 29b does not necessarily have to be provided.
Even if there is extra rubber material after punching 21b, the rubbers 21a and 21b are not the final products, so the extra rubber material may be removed by an appropriate means before press molding.

After punching out the rubber materials 21a and 21b, these two rubber materials 21a and 21b are molded into the molding die 2.
Set to 4. At this time, two rubber materials 21
Since the concaves and convexes 28a and 28b of the rubber materials 21a and 21b are formed on the a and 21b, respectively, the concaves and convexes 28a and 28b which are substantially the same as the concave and convex 31 of the bottom surface of the shoe sole at the time of completion are formed. It is in a state of fitting with the unevenness 23 which is substantially inverted from the unevenness 31 on the bottom surface of the shoe bottom when completed. In this state, the two rubber materials 21a, 2a are
If 1b is press-molded, two rubber materials 21a, 21
As for b, a shoe sole 32 is obtained, which is joined and integrated into a shoe sole shape to form irregularities 31 on the back surface thereof. Two rubber materials 21
Although a and 21b are vulcanized simultaneously with press molding, they may be vulcanized after press molding.

As described above, in the present invention, the press molding is
Concavities and convexities 28a and 28b, which are substantially the same as the concavities and convexities 31 on the bottom surface of the sole of the rubber material 21a and 21b at the time of completion, are formed in the molding die 2
4 is carried out in a state in which it is fitted with the unevenness 23 which is almost the reverse of the unevenness 31 on the back surface of the shoe sole at the time of completion.
The pressure applied to 1a and 21b is equalized in each part, and from the place where the deep groove is formed in the shoe sole 32 by the large unevenness 23 of the molding die 24 (the place where the shoe sole is thin), the excess rubber material is applied to the other place. Further, it is difficult for the rubber material to flow in, and it is also difficult for excess rubber material to flow into other portions from where the shallow grooves are formed in the shoe sole 32 (thick portion of the shoe sole) due to the small irregularities 23 of the molding die 24. As a result, the two-color rubber material 21a ',
The boundary 33 of 21b ′ does not have, for example, a wavy shape, and a good appearance of the shoe sole 32 can be obtained.

In the above example, the case of a multicolor shoe sole (two-color shoe sole) has been described, but the present invention is not limited to this, and two or more kinds of rubber materials different in material are laminated. It is also applicable to shoe soles.

[0022]

EXAMPLES Examples of the present invention will be described below with reference to the following table. In addition, Example 1 is a two-color shoe sole, Example 2 is a two-layer shoe sole, and Example 3 is a two-color / two-layer shoe sole. Punching dies 22a, 22b having inverted irregularities 27a, 27b
According to the above, the rubber materials 21a and 21b having the unevennesses 28a and 28b substantially the same as the unevenness 31 on the back surface of the finished shoe are used, and Comparative Examples 1, 2 and 3 use the rubber material having no unevenness. Is. Synthetic rubber was used as the rubber materials 21a and 21b, the vulcanization time was 8 minutes, and the appearance and cross section of the shoe sole were observed after pressing in each example.

[0023]

[Table 1]

As is apparent from the above table, the unevenness 28a, 2
Examples 1, 2 and 3 using the rubber materials 21a and 21b forming 8b were better in appearance than Comparative Examples 1, 2 and 3.

[0025]

EFFECTS OF THE INVENTION According to the present invention, a rubber material is used in which the same irregularities as those on the bottom surface of the finished shoe are formed by a punching die having irregularities that are substantially inverted from the irregularities on the bottom surface of the finished shoe. By doing so, even when two or more types of rubber materials having different materials are press-molded and integrated into the shoe sole shape, the boundary of each material on the shoe sole after press molding is good in terms of the appearance of the shoe sole. As a result, the yield and the commercial value in the production of shoe soles are significantly improved.

[Brief description of drawings]

FIG. 1 is a process diagram illustrating a process for manufacturing a shoe sole according to the present invention.

FIG. 2 is a process diagram illustrating a conventional process for manufacturing a shoe sole.

[Explanation of symbols]

21a, 21b Rubber material 22a, 22b Punching die 23 Concavo-convex that is almost inverted from the irregularity on the bottom of the shoe sole at the time of completion 24 Molds 27a, 27b Unevenness that is almost inverted from irregularity on the rear side of the shoe at the time of completion 28a, 28b Unevenness that is almost the same as the unevenness on the back of the shoe sole 31 Unevenness on the back of the sole when completed 32 Sole

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Claims (3)

[Claims] 1. Two or more types of sheet-shaped rubber materials of different materials are punched into a predetermined shape by a punching die, and the punched rubber materials are substantially inverted from the unevenness of the bottom surface of the shoe sole at the time of completion. A method for manufacturing a shoe sole, which is press-molded with a molding die having a shape such that it is integrated into a shoe sole shape, wherein the punching die is provided with irregularities that are substantially the reverse of the irregularities on the bottom surface of the shoe sole at the time of completion. A method for manufacturing a shoe sole, comprising forming irregularities on the material that are substantially the same as the irregularities on the back surface of the shoe sole at the time of completion, and then press-molding with the irregularities of the rubber material fitted in the irregularities of the molding die. 2. A punching die for punching two or more sheet-shaped rubber materials of different materials into a predetermined shape, and an unevenness which is almost the reverse of the unevenness of the bottom surface of the shoe sole when completed, and punched by the punching die. A device for manufacturing a shoe sole, comprising: a molding die that press-molds each rubber material into a shoe sole shape, wherein the punching die has irregularities that are substantially the reverse of the irregularities on the bottom surface of the sole when completed. An apparatus for manufacturing shoe soles, which is characterized in that 3. The punching die is provided with a hole for discharging excess rubber to the outside in a blade portion provided on the outer periphery of a die main body having an unevenness which is substantially inverted from the unevenness of the bottom surface of the shoe sole when completed. The shoe sole manufacturing apparatus according to claim 2, wherein: