JPS5858082B2 - shoe manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a shoe having a sole made of laminated and combined sole materials of different types or colors.

Methods of manufacturing shoes with multi-layer soles are well known in the art.

That is, the sole material for the midsole, such as polyurethane, is injected into the space formed by assembling the last with the shoe cover attached, the split side mold, and the bottom mold engraved with the sole design, and the material is foamed and hardened. After attaching the midsole to the shoe cover, lower the bottom mold to an appropriate position and inject an elastic material such as rubber or synthetic resin into the space formed to attach the outer sole to the bottom surface of the midsole. This is a method of forming layers.

In addition, after the shoe last with the shoe cover attached and the split side mold are assembled, the sole mold part just moves up and down to form a space, and the sole material is injected into this space. This is a shoe manufacturing method in which the laminated sole is integrally injection molded onto the shoe shoe.

However, in the above method, as shown in Figs. 1 and 2, a midsole 1, which is usually used to reduce weight and reduce impact, covers the outer periphery of the sole, and the outer sole is injection molded on the inner contact surface. When viewed from the side, shoes are manufactured with a midsole of one color, and the toe and heel areas that should be reinforced the most are weakened, and as shown in Figure 3, the midsole and outer sole are simply However, there are disadvantages such as the inability to integrally mold and reinforce the toe part and toe reinforcing piece at the same time as the outer sole with a material for the outer sole that has excellent slip resistance and wear resistance. was there.

However, the present invention is an improvement on the above-mentioned method, and involves injection molding which has a multi-layered sole made of an elastic material such as rubber or synthetic resin or a foamed material thereof, and where a portion of the toe part, for example, is a single-layered sole. This invention invented a method for manufacturing integrally molded shoes.

Examples will be described below with reference to the drawings.

As shown in FIGS. 4 and 6 to 8, the shoe last 3 is fitted with a collar 4 by a cord-lasting method or the like, and a lateral groove 5 is formed on the bottom surface of the toe portion.

The cross section of the groove 5 is formed into an appropriate shape such as a rectangle or a dovetail shape.

In particular, when the shoe cover 4 is attached by the cord-lasting method, a plurality of protrusions are provided on the bottom of the last 3 to create a plurality of recesses in the midsole 1, thereby reducing the weight of the sole. It is also possible to save on bottom materials.

As shown in FIG. 5, a closed groove 5 may be formed in the bottom surface of the last 3 while leaving the hanging type of the shoelace 4.

The partition 6 is a columnar body made of an elastic material such as rubber or synthetic rubber, and its cross section is formed into an appropriate shape such as a rectangle, a dovetail shape, or a semicylindrical shape. Or it is fixed so that it slightly protrudes from the bottom and lower side.

The side mold 7 is divided so that it can be opened and closed laterally,
A protrusion 8 is protruded from the upper edge of the inner periphery so as to match both ends of the partition 6, and a gap 10 corresponding to a toe portion 9 is formed extending from the protrusion 8 to the toe.

The bottom mold 11 has a bottom design engraved on its upper surface and can move up and down.

A first space 12 is formed by the shoe last 3 with the shoe cover 4 attached, the side mold 7 and the sole mold 11.

That is, when the side mold 7 is clamped from left and right to the shoe last 3 with the shoe cover 4 attached, the protrusion 8 of the side die 7 presses the side surface of the partition 6 via the lower peripheral edge of the shoe cover 4, and then the bottom The mold 11 is raised and its upper surface presses against the partition 6 to create a cavity 1 corresponding to the toe portion 9.
By blocking the flow path to 0, two reliably blocked spaces are formed.

A sole material for the midsole 1, which is an elastic material such as rubber or synthetic resin, is injected into one of these two spaces, for example, the first space 12 corresponding to the midsole 1, and is integrally molded into the cover 4. After the first step of forming the first precept type shoe, the sole mold 11 is lowered and its upper surface is fixed at the contact surface position of the outer sole 2. A second space 13 for the outer sole 2 communicating with the cavity 10 corresponding to the toe portion 9 is formed by mold assembly with the space 1.
3, a different type or different color sole material such as rubber or synthetic resin is injected, and through the second step of integrally molding the outer sole 2 on the first molded shoe, some of the shoes are made into two layers and some are made into a single layer. Shoes having the desired laminated sole can be obtained.

Of course, at the same time that the sole material for the midsole 1 is injected into the first space 12 corresponding to the midsole 1, the sole material for the outer sole and the unique and/or Alternatively, a shoe having a laminated sole integrated with the outer sole 2 to be molded next can be obtained by injecting a sole material for the toe section 9 made of a different elastic material such as rubber or synthetic resin.

Even if a California type cover is used, the function of the partition body 60 does not change, so of course it can be used.

As described above, the present invention is constructed such that the partition 6 embedded in the bottom surface of the shoe last 3 on which the shoe cover 4 is attached matches the protrusion 8 protruding from the inner circumferential upper edge of the divided side mold 7. , this is the bottom mold 1
1 is raised and its upper surface presses and fixes the partition body 6 to form a completely sealed first space 12. Furthermore, the first bottom material is injected into this space 12 and the first bottom material is injected into the space 12. - It is possible to form a molded shoe, and it is also possible to completely prevent the first sole material from flowing into the gap 10 corresponding to the toe section 9, etc., and the shape and color of the side surface of the midsole 1 can be freely changed. You can choose.

Of course, at the same time as forming the first molded shoe, if a sole material suitable for the toe section 9, which is different from the sole material for the outer sole, is injected into the cavity 10 corresponding to the toe section 9, etc., the midsole 1 and the toe section of the outer sole can be further improved. It is possible to combine the appropriate shape, color, and function.

Next, the second space 13 is formed by simply lowering and fixing the bottom mold 11 so that its upper surface is in contact with the surface of the outer sole 2.
By injecting a second sole material of a different type and/or a different color into the second space 13, the outer sole 2 can be integrally molded together with the toe part 9 etc. of the first molded shoe, and the toe part 9 is heat resistant. The sole material for the outer sole 2 is integrally formed with excellent durability, abrasion resistance, impact resistance, etc. Similarly, the heel part of the outer sole 2 is rolled up smoothly and reinforced, and has multiple layers that can be clearly distinguished as layers. Shoes with soles can be provided.

In addition, the manufacturing process is simple and easy, without any difference from the conventional work process, improving productivity and simplifying the work, and shoes with clear and elegant multi-layer soles. It has the following characteristics:

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing one conventional embodiment, and Fig. 2 is a longitudinal sectional view showing a conventional example.
3 is a cross sectional view showing another conventional embodiment, FIG. 4 is a longitudinal sectional view showing one embodiment of the present invention, and FIG. The cut bottom view, Figure 6 is the A-A tax line diagram in Figure 4, Figure 7 is the B-B tax line diagram in Figure 6, and Figure 8 is the C-C tax unit diagram in Figure 4. be. 1...Mitsudosole, 2...Outer sole, 3
... shoe last, 4 ... shoe cover, 5 ...
・Groove, 6...Partition body, 7...Side mold, 8
...Protrusion, 9...Toe part, 10...
...Gap, 11...Bottom mold, 12...
・First space part, 13... Second space part.

Claims (1)

[Claims] 1. Into the space corresponding to the sole formed by the shoe last with the shoe cover attached and the divided side and sole molds, sole materials of different types or colors are sequentially injected and filled with rubber or synthetic resin sole materials, and the shoe is made. In a shoe manufacturing method in which the sole is molded and integrally attached to the shoelace, the shoe last has a partition body protruding from the bottom of the shoe last so as to partition the bottom of the last laterally, and the side mold is a side mold. A protrusion is provided on the upper edge of the inner periphery at a position that matches the longitudinal direction of the partition provided on the bottom of the shoe last, and when the last with the shoe cover attached, the side model and the bottom model are combined, the above-mentioned A space divided into two is formed by a partition protruding from the bottom of the shoe last and a protrusion projecting from the inner upper edge of the side mold, and the first sole material is injection molded into one of the spaces. a first step of forming a first molded shoe, and a second step of lowering the sole mold and injection molding a second sole material into a single space formed by the first molded shoe, the side mold, and the sole mold. A method for manufacturing shoes characterized by comprising two steps.