JPH02198504A - Injection molding shoe - Google Patents

Abstract

PURPOSE:To prevent cracks in a seamed part, lighten the weight and diversify the shape of sole by a method wherein when the quarter is mounted on a last, the seamed part of upper and inner sole of quarter ia positioned on the other side of the grounding surface, and an insole is put on the inner sole surface after removed from the last. CONSTITUTION:An upper 7 and inner sole 8 of quarter 1 are joined with a double sewing, and mounted on a last 2 with the seamed part 9 on the other side of the grounding surface. In this case, as the upper 7 is thicker and harder than the inner sole 8, the seamed part 9 of upper is adhered closely to the base of the last 2, and the seamed part 9 of inner sole 8 is bent, onto which the base of last 2 mounts. Therefore, at the seamed part 9 of the quarter 1, the thin inner sole 8 is just doubled, but almost stuck together and doesn't project to the side of the grounding surface, so that the seamed part is not cracked and the outside beauty of the sole is not injured. Moreover, the thickness of the sole is adjustable, and the weight is lightened.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical field to which the invention pertains The present invention relates to an injection molded shoe in which a sole is integrally molded on a bag-sewn jacket.

(b) Conventional technology Conventionally, a bag stitched by bag stitching (usually called the California method) is fitted into a last mold with the seam between the bag and the midsole facing the ground surface. The sole material is injected into the space formed by the fitted last mold, side mold, and bottom mold to integrally mold the sole with the shoe cover, and the mold is removed to obtain an injection molded shoe. In this way, it was possible to integrally mold the sole of the shoe with the shoe cover, minimizing the amount of labor required, which led to the popularity it has today.

Figures 3 and 4 show a conventional bag stitch cover 01) fitted into the last mold (2), and a side mold (3) attached to the last mold (2).
, (3) and a bottom mold (4).

The seam between the leg and the midsole is located on the side of the ground surface, so if there is not enough bottom thickness between the tip of the seam and the ground surface of the sole, the seam will be damaged when worn. It is not possible to prevent cracks from occurring from the tip.

Therefore, since the sole has to be sufficiently thick, the sole becomes thicker and heavier, which goes against the trend toward weight reduction.

Therefore, improvements have been made in which the stitched portion is crimped with a crimping piece or the like before the sole is injected, and the stitched portion is shaped so that it comes into contact with the midsole surface, allowing injection molding to reduce the thickness of the shoe sole.
Eliminates the drawback that it takes a lot of effort to create the curl, and in addition, if the seam that has been shaped earlier is raised due to the injection force of the sole material, cracks will occur from the seam to the sole surface of the shoe. It has not been.

A conventional bag-stitched seam cover is fitted into the last mold in the state shown in Figure 3, but if the seam part is made of a rigid material, for example, it will be in the state shown in Figure 4, and the seam part will be attached to the ground surface. Since it is located on the side and does not fit well with the last mold, especially when forming a smart sole with no edge width, the seam part will appear on the bottom side.
It spoils the aesthetic appearance and also causes cracks, making it impossible to overcome the limitations of mechanical shoes in terms of design.

(c) Problems to be Solved by the Invention The present invention is an injection molded shoe in which an insole is attached to the bottom of a bag-stitched jacket by injection molding, and the shoe is molded into a last mold. When worn, the seam between the lace and the midsole is located on the side opposite to the ground surface, so that even if the injection molded sole is made thinner, the seam does not appear on the outer surface of the sole. To provide an injection molded shoe which can prevent cracking from a seam part because it does not come out, is lightweight, and can change the shape of the sole.

(1) Means for Solving the Problem The present invention involves fitting a bag-stitched jacket into a company last mold so that the seam between the flap and the inner sole is on the side opposite to the ground surface, and then attaching the last mold and the side The sole material is injected into the space formed by the mold and the bottom mold to integrally mold the sole with the shoe shoe, and after the mold is removed, the insole is attached to the midsole surface.

The cover is made of commonly used cloth, synthetic leather, vinyl, or a combination thereof, and is particularly effective when the cover has higher rigidity than the midsole member.

(e) Example Figures 1 and 2 show examples of the present invention.
), the last mold (2) is assembled with the side mold (3) and the bottom mold (4) to form a space (5), and the injection hole (6) of the side mold (3) is formed.
FIG. 2 is a sectional view showing the shoe sole material injection molded into the empty space (5), and FIG. 2 is a sectional view showing the shoe cover (1) after the bag stitching is completed.

The lace cover (1) is made by sewing the lace part (7) and the inner sole part (8) together, and the sewn part (9) is fitted into the last mold (2) so that the sewn part (9) is on the ground surface side. There is.

The cover (1) is commonly used cloth, leather, or synthetic leather.

It is arbitrarily selected from vinyl material or a combination thereof.

In this embodiment, the laces (7) are made of synthetic leather with a cloth lining, and a blade shape or the like is attached to the heel.

Cloth is used for the middle sole (8). In this case, Yoshibe (7
) is thicker and more rigid than the inner sole (8), so if you fit this cover into the last mold (2), you will definitely be able to
As shown in the figure, the seam part (9) of the lace part (η) is tightly attached to the bottom surface of the last mold (2), and the seam part (8) of the middle sole part (8)
9) is bent and the last mold (2) is placed on top of it.
) is fitted to the bottom of the

Therefore, the suture part (9) of the cover (1) is the thin midsole part (8).
are simply overlapped, almost as if they were glued together, and do not protrude to the ground surface side.

Last mold (2) fitted with bag-stitched cover (1)
Thermoplastic resin (PVC in this example) as a bottom material is placed in the space (5) formed by molding the side mold (3), (3) and the bottom mold (4). The sole 01 is formed by injection filling from the injection hole (6) provided in 3), and after demolding, the EVA sponge and pile fabric are bonded together with an insole or an insole, or the sole is attached removably. I was able to get the product.

(F) Effects of the Invention The present invention involves fitting a bag-stitched jacket into a last mold so that the seam between the flap and the inner sole is on the side opposite to the ground surface, and molding it with a side mold and a bottom mold. Since the sole material is injected into the formed space and the sole is integrally molded with the shoe cover, even if the seam is on the side opposite to the contact surface, it will be removed at the bottom of the last mold during molding. It is formed as a smooth surface without being curved or protruding, and the seam does not protrude toward the ground surface as in the past, so the seam does not appear on the outer surface of the sole or the thickness to the outer surface of the sole is reduced. At the same time, cracks do not occur at the seam and the appearance of the outer surface of the sole is not spoiled.

In addition, since there is no protruding part on the outer surface of the bottom of the shoe cover, the thickness of the sole can be adjusted freely, and furthermore, the sole can be formed with almost no edge width, resulting in a lighter weight. As a result, even though they are injection molded shoes, they were able to create the feel of hand-made shoes.

Furthermore, since the present invention is not formed as a protruding part on the inner sole side of the cover, just by attaching a conventional cup insole, insole, etc. to improve comfort or function, the comfort or function of the shoe can be improved. I was able to improve my functionality.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an embodiment of the present invention, FIG. 2 is a cross-sectional view of the shoe cover, and FIGS. 3 and 4 are cross-sectional views showing the molding state of a conventional injection-molded shoe. 1--Falling, 2--Last mold, 3--
- Side mold, 4...Bottom mold, 5--Space, 6-Injection hole, 7--Fold section, 8--Middle bottom, 9--Sewing section, 10... -Sole, 11...
Traditional cover.

Claims (1)

[Claims] The bag-stitched jacket is fitted into the last mold so that the seam between the flap and the middle sole is on the side opposite to the ground surface, and the bottom material is injected into the space formed by the side mold and the bottom mold in the last mold. Then, the sole of the shoe is integrally molded into the shoe cover.
Injection molded shoes with an insole attached to the midsole after the mold is removed.