JPS6141401A - Production of shoes - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method of manufacturing shoes, and more particularly to a method of manufacturing shoes whose soles are molded from the same or different material as the shoe body.

(Prior Art) Conventionally, in the case of injection molded boots or short shoes, when the shoe body and the sole are manufactured from different injection molding materials, the shoe body and the sole are first molded separately, Next, there is a method of manufacturing by attaching the sole to the shoe body with adhesive, or a method of injection molding the shoe body and sole in two steps, using a photo mold as a mold and a dummy bottom as the mold. It has been adopted.

In addition, boots or short shoes with double-layered soles of different colors, for example, are becoming available, but even in the manufacturing method of shoes with double-layered soles, different colors or different materials are combined. A method is adopted in which the bottom of the water is molded and the cover is then integrally adhered.

(Problems to be Solved by the Invention) However, in each of the above methods, for example, in a manufacturing method in which the shoe body and the sole are made separately,
Problems include the fact that many manufacturing steps are required to bond using adhesives, and the shoe body must be accurately positioned at a predetermined position on the sole, requiring considerable skill from the manufacturing staff. It has points.

In addition, in the two-color molding method that uses a dummy bottom, it is relatively easy to mold different colors of the same material, but when injection molding is performed using different materials, the curing time of each injection material is complicated. There is a problem that the molding process management becomes considerably complicated.

(Means for Solving the Problems) The present inventors have solved each of the problems in the above-mentioned conventional methods, and have not only integrally molded a shoe sole and a shoe body with different color combinations made of the same material, but also In order to make the molding of the sole and the shoe body easier, a shoe outer sole with a specific shape made of a different (or different color) material was molded in advance, and this was then molded into a bottom mold. After that, the shoe body or the inner sole is formed using the last mold and the side mold, and the shoe body or the inner sole is coated with a material that is the same or different (or has a different color) from the outer sole. They newly discovered that injection filling can easily produce shoes with soles having a good multilayer structure, and have completed the present invention.

That is, the present invention provides a shoe made of a flexible material, which has a hole approximately in the center into which an injection port for the injection material can be inserted, and whose sole periphery has a boat bottom shape that is somewhat larger than the bottom periphery and height of the bottom mold. Pre-molding the outsole; inserting the injection port into the hole in the outsole, inserting and holding the outsole into the bottom mold, and then holding the last mold in a predetermined position, thereby forming the last mold and the outsole. An inner sole space is formed between the shoe outer sole inserted into the bottom mold, and the inner wall surface of the side mold is located inside the inner wall surface of the bottom mold, and the lower end surface of the side mold periphery is connected to the shoe outer sole inserted into the bottom mold. By holding the side mold in a predetermined position so that it is in contact with the upper end surface of the peripheral edge of the last mold and then in close contact with the upper end surface of the peripheral edge of the bottom mold, there is no space between the last mold and the side mold in the shoe body space or the sole peripheral edge. forming a space; then, injection-controlled filling of the shoe inner sole space, the shoe body space, or the sole peripheral space with an injection material that is the same as or different from the shoe outsole material through an injection port; The present invention relates to a method of manufacturing shoes characterized by integrally molding an inner sole and an outer sole.

In this case, injection filling into the shoe inner sole space, the shoe body space, or the sole peripheral space can be detected and controlled by micro-limits installed at appropriate predetermined positions of the bottom mold.

(Function) In the shoe manufacturing method of the present invention, the outer sole of the shoe is molded in advance into a boat bottom shape that conforms to the bottom mold, and the periphery of the bottom is slightly lower than the periphery and height of the bottom mold. I'd like it to be larger. Therefore, when such a shoe outsole is inserted and held in the bottom mold, the shoe outsole is pressed against the bottom mold, and at the stage of holding the side mold, the upper end surface of the shoe outsole periphery is also pressed into contact with the bottom mold. Shoes with an excellent design can be manufactured without any injection material leaking into the molding lines.

Injection materials used in the shoe manufacturing method of the present invention include:
For the outer sole, inner sole, and shoe body, synthetic resin materials such as polyvinyl chloride resin, thermoplastic resin, urethane resin, or synthetic resin materials containing foaming agents can be used. Vulcanized rubber materials such as natural rubber and synthetic rubber can be used as the injection material for the outer sole.

Furthermore, when a pre-formed shoe outsole is manufactured by press molding, the above-mentioned rubber-based molding material is the main molding material.

(Example) The present invention will be described in more detail below with reference to an example based on the drawings.

FIG. 1 is a cross-sectional view of a shoe outer sole inserted and held in a bottom mold, with injection material being injected into the shoe inner sole and the shoe body.

That is, in the shoe manufacturing method of the present invention, first of all, there is a hole 3 approximately in the center into which the injection port 2 of the injection material can be inserted, and the bottom periphery 4 is connected to the bottom periphery 6 of the bottom mold 5 and An outsole 1 made of a flexible material and having a boat bottom shape that is somewhat large in height is made in advance by injection molding, press molding, or the like. Next, this shoe outsole 1 is inserted and held in the bottom mold 5. In this case, the hole 3 of the shoe outsole 1
is inserted into the injection port 2 provided in the bottom mold 5 for filling the shoe body 8 and the shoe inner sole 7 with the injection material, and then the shoe outer sole 1 is inserted and fixed into the bottom mold 5. At this stage, the outer sole rim 4 of the shoe is somewhat larger than the bottom rim 6 of the bottom mold, so the outer sole ■ comes into close contact with the inner wall surface 11 of the bottom mold.

Next, the last mold 9 is held in a predetermined position to form the shoe inner sole 7 space, and the side mold 10 is further held in a predetermined position to form the shoe body 8 space.

In this case, the bottom periphery 4 of the shoe outsole 1 is somewhat larger in height than the bottom periphery 6 of the bottom mold. Therefore, in order to hold the side mold 10 in a predetermined position, the sole periphery 4 of the outsole is compressed in the direction of the arrow in the drawing and is pressed against the lower end surface of the side mold periphery.

This state is shown in FIG. FIG. 2 is an enlarged view of the side mold 10 in section A in FIG. 1 just before it is held in a predetermined position.

That is, when the shoe outsole 1 is inserted into the bottom mold 5, the shoe outsole l has the bottom periphery 4 aligned with the bottom periphery 6 of the bottom mold.
The outer sole of the shoe is electrodeposited on the inner wall surface 11 of the bottom periphery of the bottom mold because it is somewhat larger, but the bottom periphery 4 is somewhat larger in height than the bottom periphery of the bottom mold, that is, it is larger by the text in the middle of FIG. ing. Therefore, when the side mold IO is held in a predetermined position (this state diagram is shown in FIG. 3), the bottom peripheral edge 4 is compressed in the direction of the arrow in the figure, and the side mold peripheral lower end surface 12 and the bottom mold peripheral upper end surface 13 are respectively compressed. This prevents the injection material from leaking onto the parting line 14, which is the crimping surface.

In addition, in the shoe manufacturing method of the present invention, it is necessary that the inner wall surface 15 of the side mold is located inside the inner wall surface 11 of the bottom mold. That is, the side mold 10 has the effect of compressing the peripheral upper end surface 16 of the shoe outsole with its lower peripheral end surface 12 without force, and uniformly filling the injection material through the shoe inner sole 7 space to the shoe body 8 space. It is something that you have.

In addition, when inserting the shoe outsole l into the bottom mold 5 in FIG. 1, the fitting part 20 is inserted into the bottom mold in advance.
It is also good to provide a fitting part 20 so that a recessed part of the outer sole of the shoe fits into this fitting part 20.

In addition, in order to facilitate and ensure the fitting of the outer sole of the shoe to the bottom mold, some of the fitting parts 20 may be formed with reverse tapers to make the fitting even stronger. A fitting part 20 smaller than the four parts of the shoe outsole may be provided on the center side of the mold, or if the fitting part 20 is fitted with the four parts of the shoe outsole, there will be a gap on the joint surface. A gap may be created.

In the embodiment of the shoe manufacturing method of the present invention based on the above-described FIGS. 1 to 3, the shoe inner sole space and the shoe body space formed by the bottom mold, last mold, and side mold are filled with injection material. This relates to the manufacture of boots, boots, etc., in which the inner sole and the shoe body are integrally molded. Below, an example of integrally manufacturing the inner sole and the periphery of the sole of short shoes will be described. .

In the method of manufacturing short shoes, the outer sole of the shoe is inserted and held in the bottom mold as described above, and the last mold 9 shown in FIG.
Then, the side mold 10 shown in FIG. 1 has a shape that forms the space around the sole of the shoe, is held in a predetermined position, and is injected from the injection port. This is done by injection filling the material.

FIG. 4 shows an enlarged sectional view of the toe portion during the manufacture of short shoes.

That is, as in the case shown in FIG. 1, the shoe outer sole 1 is inserted and held in the bottom mold 5, and then the shoe cover 17 is suspended in the last mold 9, and then held in a predetermined position and the shoe inner sole 7 space is inserted. , the side mold 18 is held in a predetermined position, and a space around the sole periphery 19 is formed.

Even in this case, the sole periphery 14 of the outer sole of the shoe is somewhat larger in size and height than the periphery 6 of the bottom mold, so that the paring line 14 is made uniform. It is.

In addition, in manufacturing the boots shown in FIGS. 1 to 3 and short shoes shown in FIG. , for example, by embedding a micro limit switch in an appropriate position in the mold and sensing the arrival of the injection material injected into those spaces, or by lowering the bottom mold by the pressure of the injection material filled into those spaces. The method allows controlling the amount of injection material that is filled.

(Effects of the Invention) As described above, the shoe manufacturing method of the present invention allows the shoe outsole made of an injection material different from the shoe body to be integrally manufactured in a simple process, and also allows the shoe outsole to be manufactured in a simple process. This manufacturing method allows the sole to have various design patterns or the entire shoe sole to have a two-layered structure in two colors, and has particularly excellent practical value.

In addition, by making the outer sole of the shoe a little larger than the bottom mold, it is in close contact with the inner wall surface of the bottom mold, and is compressed (suppressed) from the lower end surface of the side mold, so that the parting line can be easily removed from the parting line. This has the advantage that it is possible to prevent this from occurring and to manufacture shoes with good adhesion between the outer sole and the inner sole.

Furthermore, since conventionally used molds can be used almost as they are, its industrial value can be said to be particularly excellent.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention, FIG. 2 is an enlarged view of part A in FIG. 1 before the side mold is held in place, and FIG. FIG. 4 is a view after the side mold in the figure is held in place; FIG. 4 shows another embodiment of the present invention; 1... Outer sole of the shoe 3... Hole 4... Bottom periphery, □ 5... Bottom mold 6... Bottom periphery, 7... Inner sole 8... Shoe body,
9... Last mold 10... Side mold predo, 17... Sole rim 19... Sole periphery Patent applicant Achilles Co., Ltd. (and 1 other person) Fig. 2 Fig. 3 Fig. 1 Drunk W Ram No. Figure 4

Claims (2)

[Claims] (1) A shoe outer sole made of a flexible material, which has a hole approximately in the center for inserting the injection port for the injection material, and the bottom periphery has a boat bottom shape that is somewhat larger than the bottom periphery and height of the bottom mold. Pre-molding: Inserting the injection port into the hole in the outsole, inserting and holding the outsole into the bottom mold, and then holding the last mold in a predetermined position, the connection between the last mold and the outsole is made. forming a shoe inner sole space between; then, the inner wall surface of the side mold is located inside the inner wall surface of the bottom mold, and the lower end surface of the peripheral edge of the side mold is placed on the peripheral edge of the shoe outer sole inserted into the bottom mold; By holding the side mold in a predetermined position so that it is in contact with the end surface and then in close contact with the upper end surface of the bottom mold periphery, a shoe body space or a sole periphery space is created between the last mold and the side mold. forming; Next, injecting and filling the shoe inner sole space, the shoe body space, or the shoe sole peripheral space with an injection material that is the same as or different from the shoe outer sole material through an injection port; forming the shoe inner sole; and a method of manufacturing shoes, characterized in that the outer sole of the shoe is integrally molded. (2) Injection filling into the shoe inner sole space, the shoe body space, or the shoe sole peripheral space is detected and controlled by micro-limits installed at appropriate predetermined positions of the bottom mold. method of manufacturing shoes.