JPH0116484B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing shoes in which an outer sole and an inner sole, which are separated by a shoe sole fabric, are simultaneously integrally molded.

[Conventional technology]

Conventionally, as a shoe manufacturing method, as is clear from the conventional shoe manufacturing method shown in FIGS.
From the untrodden part 29 of the split last D consisting of 8 to the heel part 2
An insole molding gap 30 is formed on the periphery of the sole between 8 and 8. A sole fabric supporting beam 31 is divided and provided around the periphery, and a sole fabric 34 having a through hole 33 is attached to the lower edge of the shoe cover 32. Hanging and attaching the sewn hook part 35,
After that, this is fitted into the shoe outsole molding cavity 38 formed by the bottom mold 36 and the side molds 37, 37', and then passed through the shoe outsole molding cavity 38 and the through hole 33 from the injection port 39 into the shoe outsole molding cavity 38 and the through hole 33. There is a shoe manufacturing method that simultaneously injects and fills a shoe outsole material (not shown) into the sole molding cavity 30 and integrally molds a shoe outsole and an insole (not shown).
(See Fig. 6 and Fig. 6, as well as Japanese Patent Publication No. 53-9136 and Japanese Patent Publication No. 59-13845).

In this method, the bottom fabric support bulge 3 for forming the inner sole is
1 around the bottom periphery of the bottom surface of the split last D, a uniformly shaped insole (not shown) can be placed at a predetermined position on the bottom cloth 34 when injecting and filling the outsole material (not shown). By making it moldable and by dividing and arranging the bottom cloth supporting beam 31 on the bottom surface of the last main body 27 and the heel portion 28, the above-mentioned shank cover 32 can be easily attached to the split last D. The length of the bottom part of the split last D can be shortened.

[Problems to be Solved by the Invention] By the way, in this conventional method of manufacturing shoes, the insole (not shown) of the shoe is formed by forming the split last D by means of the bottom fabric supporting bulge 31. Outsole material (not shown) overflowing from the outsole forming gap 38 is injected into the insole forming gap 30 formed and supported between the bottom surface and the sole fabric 34 through the through hole 33, thereby forming the insole. The internal air in the sole molding cavity 30, the dissolved gas in the sole material, or the gas generated from the sole material (hereinafter, these air or gases may be simply referred to as "air") is present in this cavity. It is formed by filling the entire void pushed out to the outside with sole material (not shown).

For example, without providing the bottom fabric support joist 31 around the bottom periphery of the split last D, the split last D is simply
5, the internal air in the inner sole molding gap 30 can be extracted from the upper end of the sleeve 32 through the gap between the sleeve 32 and the split last D. However, in the case where the bottom cloth support bulge 31 is provided around the circumference, the split last D is formed on the circumferential surface where the gap is formed, that is, from the untrodden portion 29 to the heel portion 28.
No internal air extraction structure is provided on the bottom surface and the inner surface of the bottom cloth 34. For this reason, most of the internal air in this gap escapes through the gap between the tip of the bottom fabric support joist 31 and the cover 32, but the internal air near the base of this joist cannot be extracted. A void will be formed at the upper peripheral edge of the midsole (not shown) after molding. As a result, the elasticity of the insole (not shown) becomes non-uniform, lowering the product value and making it difficult to wear the shoe.

In view of the problems of the prior art, the present invention makes it possible to manufacture shoes that do not form voids in the midsole, and therefore makes it possible to have uniform elasticity throughout the midsole, thereby making it possible to improve the feeling of wearing the shoe. In addition, the present invention aims to provide a method for manufacturing shoes that can improve the product value.

[Means to resolve the problem]

That is, the present invention provides a structure in which a bottom fabric supporting bulge is provided around the bottom periphery of a split last consisting of a last main body and a slidable heel portion to form and support an insole molding gap at least at the bottom periphery from the unstepped portion to the heel portion. Then, a heel part made by sewing a sole cloth with a through hole to the lower edge of the shoe's heel is attached to this, and then this is attached to the shoe outer sole molding cavity formed by the bottom mold and side mold. After fitting, the shoe outsole and the insole are integrally molded by simultaneously injecting and filling the outsole material into the outsole forming gap and the insole forming gap, wherein the split mold The present invention provides a method for manufacturing shoes, characterized in that a split last is used as the last, in which air vent holes are formed in the bottom fabric support joists to communicate from the inner surface to the outer surface.

[Effect]

In the method of manufacturing shoes of the present invention, the split last to which the laces of the shoe are attached is a split last in which air vent holes are formed in the bottom fabric support beams to extract air from the voids formed in the midsole. By using this method, when forming the insole by injecting and filling the shoe outsole material into this gap, the internal air in this gap is completely extracted from the air vent hole and the insole is formed. This makes it possible to manufacture shoes without forming voids in the insole, thereby making it possible to make the elasticity of the entire midsole uniform, thereby making the shoe comfortable to wear and improving its commercial value.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a bottom perspective view of a split-type last according to the first embodiment in which the last main body and the heel portion are divided and provided with protrusions for supporting the bottom fabric, and FIG. FIG. 2 is a sectional view showing an implementation state of the present invention using the split last shown in FIG. 1;

Next, FIG. 3 is a bottom perspective view of the split last of the second embodiment in which the bottom of the heel portion is expanded to the entire area of the midsole molding gap used in the present invention, and FIG.
The figure is a bottom perspective view of the third split last, in which a base plate for forming an insole having a protruding beam for supporting the bottom cloth is screwed onto the heel part.

First, referring to FIGS. 1 and 2, in the shoe manufacturing method of the present invention, a split last A consisting of a last body 1 and a heel portion 2 is provided with a bottom cloth 4 on the lower edge of a heel 3. Attach by hanging the lace part K to which it is sewn (see Figure 2). In this case, this split last A has a heel part 2 hinged to the heel notch part 1a of the last main body 1 so as to be able to slide freely in the direction of the toes, and the bottom surface of this heel part 2 and the outer peripheral edge of the non-stepping part 5. There is a U-shaped elongated bottom fabric support beam 6 whose height gradually decreases as it goes toward the toe.
is divided into the last main body 1 and the tread portion 2 and provided around the periphery, and as a result, a midsole molding gap 7 of a constant shape is formed between the bottom surface of the split last A and the inner surface of the bottom cloth 4. . A small air vent hole with a hole diameter of 0.01 to 1.0 mm, preferably 0.05 to 0.1 mm, extending from the inner surface to the outer surface (last side) of the bottom fabric support joist 6 is provided on the entire circumferential side of the attachment part of the bottom fabric support joist 6. 8 is
5 to 15 holes, preferably 7 to 10 holes, are bored at approximately predetermined intervals.

The sole cloth 3 attached to the split last A is provided with an outer sole material (not shown) at least in the range from the heel part 2 to the non-stepping part 5, that is, in the region where the midsole molding gap 7 is formed. A predetermined number of through holes 9 are bored (see FIG. 2).

The method of attaching the lace part K, which has this bottom cloth 3 as a component, to the split last A is to first slide the heel part 2 toward the bottom of the toe of the last A to temporarily shorten the length of the bottom surface of the split last A. (not shown), then loosely attach the lace part K to the split last A while hanging it from the toe of the split last A, and then pull the heel part 2 back to its original position to return the split last A to its original position. The length of the bottom surface of the mold is restored, and the lace part K is attached to this split mold last A under tension.

After that, split type last A with this lace part K attached.
is fitted into the shoe outsole molding cavity 12 formed by the side molds 10, 10' and the bottom mold 11 (see FIG. 2). As a result, the outsole forming gap 12 and the midsole forming gap 7 are communicated through the through hole 9 of the sole cloth 3.

At this time, the middle bottom molding gap 7 on the bottom of the split mold last
You may temporarily attach an insole to the formation area. As the material for the insole, reinforcing materials or cushioning materials such as felt, cloth, and Texon paper can be used.

One side mold 10' is formed with an injection port 13 for shoe outsole material (not shown), and subsequently, the shoe outsole material is injected and filled through this injection port 13. The shoe outsole material injected and filled from the injection port 13 flows into the insole forming gap 7 through the shoe outsole forming gap 12 and the through hole 9 formed in the sole cloth 3.

At this time, due to the inflow of the sole material, the internal air in the insole molding gap 7 is released from the air vent hole 8 formed on the circumferential side of the sole fabric supporting beam 6, and the internal air near the base of the sole fabric support beam 6 is removed. is drawn out to the outside, and the entire gap is filled with the sole material without any gaps, so that a shoe integrally molded with the laces K is manufactured.

Note that the forming range of the midsole molding gap 7 can be arbitrarily expanded, for example, to cover the entire bottom surface of the split last A. Further, the formation position of the air vent hole 8 is not limited to the attachment part of the bottom cloth supporting joist 6, but can be formed at an appropriate position on the circumferential surface of this joist, and the diameter of the air vent hole 8 can also be changed. The diameter of the hole is not limited to the above, and any number of holes can be formed. However, the formation position of the air vent hole 8 is preferably at the attachment part of the bottom fabric support bulge 6, where the internal air in the inner sole molding cavity 7 can be smoothly vented, and the hole diameter is also the same as that described above. This prevents the sole material from overflowing from this hole when forming the insole.
Alternatively, it is preferable because air can be easily extracted.

Furthermore, it is also possible to lay an insole (not shown) from the outside on the upper part of the midsole of the obtained shoe. It is also possible to use a lace part K in which a reinforcing agent such as a foam piece, a rubber piece, or a fibrous material or a cushion material (not shown) is provided on the inside or outside of the heel part on the last side of the bottom fabric 3. , and the heel part 2
It is also possible to use a split last A in which the reinforcing material or cushioning material (not shown) is provided on the bottom surface of the split last A.

In this way, by forming the air vent hole 8 on the circumferential side of the bottom fabric support joist 6, the internal air in the inner sole molding gap 7 is completely extracted from the air vent hole 8, thereby preventing the formation of voids. This makes it possible to manufacture shoes with a midsole, and therefore makes it possible to have uniform elasticity throughout the midsole, thereby making the shoe comfortable to wear and improving its commercial value.

In addition, since the shape of the bottom of the split last A is formed to approximately match the shape of a human foot, the resulting shoes (not shown) can be worn comfortably, and This wearing can reduce the degree of fatigue. Furthermore, due to the presence of the bottom fabric supporting joists 6, the midsole molding gap 7 is formed when the lace part K is attached to the split last A, and the inside of the resulting shoe (not shown) is formed. Inevitably, there is a space between the cover 2 and the side surface of the midsole (not shown), and as a result, the flexibility of the cover 2 is improved, and it is possible to put the foot in and take it out. can be done.

Next, a second embodiment of the present invention will be described with reference to FIG.

The split last B used in this example is the heel part 14.
A slightly thin and last body 15 is attached to the bottom 14a of the
A protruding plate 17 for forming the inner sole in the shape of a sunbeam is integrally formed to cover the entire area of the unstepped part 16. The bottom periphery of this midsole forming substrate 17 has a U-shaped shape when viewed from the bottom, which gradually decreases in height as it goes toward the toe, similar to the case of the split last A used in the above embodiment. A slender bottom cloth supporting beam 18 is provided around the periphery.
Moreover, small air vent holes 8 with a hole diameter of 0.01 to 1.0 mm, preferably 0.05 to 0.1 mm, communicating from the inner surface to the outer surface (last side) are provided at approximately predetermined intervals on the entire circumferential side of the attachment part of the bottom fabric support joist 18. The number of holes is about 5 to 15, preferably about 7 to 10.

As a result, a midsole molding gap 20 of a constant shape is formed between the midsole molding protruding plate 17 having the bottom supporting beam 18 and the bottom cloth.

In this way, the midsole forming gap 20 is formed by expanding the bottom portion 14a of the heel portion 14.

Thereafter, as in the case of the above embodiment, as shown in FIG. A shoe outsole material (not shown) is fitted into the sole molding cavity 12 and inserted into the outsole molding cavity 12 and the midsole molding cavity 20.
Shoes are manufactured by injecting and filling.

Note that the forming range of the midsole molding gap 20, that is, the forming range of the midsole molding protruding plate 17, can be arbitrarily extended to the vicinity of the toe where the length of the bottom surface of the split last B can be shortened by sliding the heel portion 14. It is possible.

In this way, since the protruding plate 17 for forming the insole is integrally formed on the bottom 14a of the heel part 14, it is possible to manufacture shoes without leaving any traces of bleeding of the shoe outer sole material on the inner surface of the shoe. , Therefore, when inserting the foot into the shoe,
While not causing discomfort to the feet and eliminating the occurrence of blisters, calluses, warts, etc. caused by bleeding marks, the appearance of the shoes can also be improved, and the split last B has a small number of parts. It is possible to form the same number of points as conventional ones, and since no mounting parts such as mounting screws are used, there are no screw marks on the surface of the molded insole, and it is possible to finish it neatly. It also has effects.

Next, a third embodiment of the present invention will be described with reference to FIG.

The split last C used in this example is the heel part 2.
1, the entire area of the midsole molding gap 22 is covered from above, that is, a split type last is used in which the heel part extends to the entire area of the midsole molding gap. Specifically, the bottom surface of the heel part 21 is covered with A metal substrate 23 for forming the inner sole 23 in the shape of a sunbeam is screwed with a plurality of screws 24 (four screws in this case).

On the outer periphery of the bottom of this midsole forming substrate 23, similar to that used in the above two embodiments,
A U-shaped elongated bottom cloth supporting beam 26 is provided around the periphery.
In addition, small air vent holes 25 with a hole diameter of 0.01 to 1.0 mm, preferably 0.05 to 0.1 mm, which communicate from the inner surface to the outer surface (last side) are arranged at approximately predetermined intervals on the entire circumferential side of the attachment part of the bottom cloth support joist 26. ~15 holes, preferably about 7 to 10 holes.

In this way, also in this embodiment, the midsole molding gap 22 is formed by expanding the bottom of the heel portion 21 by installing the midsole molding substrate 23.

Thereafter, as in the case of the above two embodiments, as shown in FIG. The shoe is fitted into the shoe outsole molding cavity 12, and the shoe outsole material (not shown) is injected and filled into the shoe outsole molding cavity 12 and the midsole molding cavity 22 to manufacture the shoe.

Note that the installation position and installation method of the insole molding substrate 23 on the heel portion 21 are not limited to those described above.
Other suitable locations and methods are also possible.

That is, for example, a wedge-shaped tongue piece (not shown) is formed at one end of the base plate 23 for forming the insole, and this tongue piece is attached to the circumferential side of the heel part 21 to attach the base plate to the heel part 21. It is also possible to install

Further, the material of the substrate 23 for forming the inner sole is not limited to metal, but other materials such as synthetic resin, wood, and ceramics can also be used.

Since the midsole forming substrate 23 is screwed onto the bottom surface of the heel portion 21 in this way, the formation of the so-called midsole forming protruding plate 17 in the above-described embodiment, which protrudes from the original heel portion 21 toward the toe, is possible. In addition, when the substrate 23 for forming the inner sole is worn out or damaged due to long-term use, it can be easily replaced.

In addition, the material for the shoe outsole material used in the present invention includes a moldable shoe outsole material such as vinyl chloride resin, ethylene-vinyl acetate copolymer, and polyurethane resin, and if necessary, a foaming agent and other additives. etc. are added as appropriate.

Materials for the cover 3 include canvas, polyester, nylon, leather, synthetic leather, etc.
Using a known material such as natural leather, and using a bottom cloth 4
For example, known materials such as cloth such as felt cloth and cotton cloth, and paper such as cardboard and Texon paper are used.

Furthermore, the present invention can be applied to any method of manufacturing shoes, such as injection molding or cast molding.

〔Effect of the invention〕

The present invention provides a split last to which a shoe lace is attached, and a bottom fabric support beam that forms and supports an insole molding gap is provided around the sole periphery from at least the non-stepping part to the heel part. The outer sole and the inner sole of the shoe, which are separated by the sole fabric, are separated by using a split type last in which an air vent hole is formed in the protrusion for supporting the sole fabric to extract air from the cavity formed in the inner sole. At the same time, by integrally molding shoes, it is possible to manufacture shoes that do not form voids in the midsole, and therefore, the elasticity of the entire midsole can be uniform, which makes the shoes feel good when worn. , it is also possible to improve the product value.

[Brief explanation of drawings]

1 to 4 show one embodiment of the present invention, and the first
The figure is a bottom perspective view of the split-type last of the first embodiment in which the last main body and the heel part are divided and provided with protrusions for supporting the bottom fabric, and FIG. A cross-sectional view showing the implementation state of the present invention using a mold last, FIG. 3 is a bottom view of the split mold last of the second embodiment in which the bottom of the heel portion is extended to the entire area of the midsole molding gap used in the present invention. The perspective view of FIG. 4 is a bottom perspective view of the third split last in which a substrate for forming an insole having a protruding beam for supporting the bottom cloth is screwed onto the heel portion. Furthermore, Figures 5 and 6 show a conventional shoe manufacturing method, Figure 5 is a cross-sectional view showing a state in which the conventional split last is used, and Figure 6 is a perspective view of the conventional split last seen from the bottom. It is a diagram. In the drawings, A, B, C are split lasts, 1,
15 is the last main body, 2, 14, 21 are heel parts, 3 is a collar, 4 is a bottom cloth, K is a collar, 6, 18, 26 are ridges for supporting the bottom cloth, 7, 20, 22 are middle soles. molding void,
8, 19, 25 are air vent holes, 9 is a through hole, 10,
10' is the side mold, 11 is the bottom mold,
Reference numeral 12 designates a void for forming the outer sole of the shoe, reference numeral 13 designates an injection port, reference numeral 17 designates a protruding plate for molding the midsole, and numeral 23 designates a substrate for molding the midsole.

Claims (1)

[Scope of Claims] 1. A split last consisting of a last body and a slidable heel part, at least around the bottom peripheral edge from the unstepped part to the heel part to form an insole molding gap. A lace part made by sewing a sole fabric with a through hole to the lower edge of the lace part of the shoe is attached to this, and then this is attached to the shoe outer sole molding cavity formed by the bottom mold and side mold. In the shoe manufacturing method, the shoe outsole and the insole are integrally molded by simultaneously injecting and filling the shoe outsole material into the shoe outsole molding gap and the insole forming gap after fitting the shoe outsole and the insole. A method for manufacturing shoes, characterized in that a split last is used as the last, in which an air vent hole extending from the inner side to the outer side is bored in the bottom fabric support joist. 2. The length of the midsole molding gap in the front-rear direction of the shoe is set to an appropriate length from the heel of the split last to the vicinity of the toe, and a split last is used in which the bottom of the heel extends to the entire area of the midsole molding gap. A method for manufacturing shoes according to claim 1, comprising: 3. A substrate for forming an insole corresponding to the entire area of the insole forming gap is installed at the bottom of the heel of the split last, and an insole forming gap is formed and supported at the outer periphery of the substrate for supporting the insole fabric for supporting the insole. A method of manufacturing shoes according to claim 1, which uses a split last having a projecting beam around it.