JPH01185201A - Manufacture of footwear and device therefor - Google Patents

Abstract

PURPOSE:To simplify a manufacturing process and to effectively manufacture the captioned footwear of stable quantity, within a small manufacturing variation, for a short time by forming a bag-like body with a partial cut-out carapace and an intermediate bottom, and inserting the bag-like body around a punch in which a part abutted on a molded has a different hardness from that of the mold. CONSTITUTION:A footwear with a partially cut-out carapace is manufactured as follows. A bag-like body is formed with a partial cut-out carapace 3 and an intermediate bottom 4. The bag-like body is inserted around a punch 1 in which a part abutted on the mold 2 has a different hardness from that of the mold 2. The punch 1 is placed in a single bottom mold 2a or a mold 2 composed of a bottom mold 2a and a side mold 2b. Then, the mold 2 is abutted on the surface of the punch 1 or of a projected outer periphery part 9 of a folded intermediate bottom so as to from a gap 7 for forming a bottom part and charge a bottom part forming material in the gap 7 so that the bottom part and intermediate part are integratedly formed.

Description

[Detailed Description of the Invention] "Field of Industrial Application" This invention relates to a method for manufacturing footwear and a manufacturing device for footwear used therein. The present invention relates to a method and apparatus for manufacturing shoes.

[Prior art] As a method for manufacturing footwear (J1 insole and lace cover are sewn together to form a bag-like body, the bag-like body is molded into a male mold (last) for forming the bottom).
A molten thermoplastic resin, such as a hinyl chloride resin, polyurethane, or thermoplastic rubber, is injected into the gap formed between the inner mold and the female mold for bottom molding, and then cooled to form an inner sole. The injection molding method (injection method), which integrally molds the sole of footwear, is generally known.

In addition, there is also known a hullized method in which a necessary amount of thermoplastic material, such as unvulcanized rubber, is charged into a female mold, and a male mold is attached, followed by pressurization and heating to complete the footwear.

All of these methods of manufacturing footwear involve manufacturing footwear by fitting a bag-like body with an insole and a sleeve sewn into a male mold, and is generally widely adopted as the California method. Devices used therefor are also known.

However, if open toe type shoes with an open toe part of the toe part or band type footwear with openings in the toe part and heel part of the toe part are made by the above manufacturing method,
The molten thermoplastic resin in the bottom molding gap leaks out from the notch in the sleeve, and after cooling, a large piece protrudes beyond the top of the midsole, significantly reducing the commercial value of the product. It happened.

Therefore, the method of manufacturing footwear with a part of the shoe cover cut out is to sew or glue the shoe cover and the insole, and then glue the footwear sole and the insole, which were formed in a separate process. It was manufactured using a multi-step, almost handmade process.

In view of the above, the present applicant proposed the manufacturing method described in Utility Model Application No. 62-283190 as a method for manufacturing footwear having a part of the shoe cover cut out.

That is, by using a method and apparatus for molding the bottom part by injection molding, the middle bottom of the cutout part of the sleeve is made to protrude beyond the periphery of the lower surface of the male mold, and this protruding part of the middle bottom connects the male mold to the female mold. In this shoe manufacturing method, the gap with the mold is closed, the footwear sole is cooled and solidified, and then the protruding portion of the insole is cut and removed along the periphery of the upper surface of the sole.

[Problems to be Solved by the Invention] Among the conventional methods of manufacturing footwear in which a part of the shoe cover is cut out, the sole of the footwear is created in a separate process and then bonded to the shoe cover and the bag-like body of the midsole. The manufacturing method has the problem that it takes a lot of time and the number of people working, and the manufacturing efficiency is low.

In addition, even with the manufacturing method described in Utility Model Application No. 62-283190, the insole is made to protrude in an uneven manner and that portion is cut and removed later, resulting in unnecessary material costs and the cutting and removal process. There is a problem in that the manufacturing price increases due to an increase in the number of parts, and the quality of the product decreases due to variations in the cutting part during the cutting operation of the protruding part.

It is an object of the present invention to provide a manufacturing method and manufacturing apparatus with good work efficiency and manufacturing efficiency, which can manufacture footwear with a partially cut out part of the footwear as low-cost, high-quality, consistent footwear.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a method for manufacturing footwear in which a part of the shoe cover is cut out. Then, this bag-like body is fitted into a male mold whose abutting part with the female mold has a hardness difference from that of the female mold, and this male mold is used as a bottom mold alone or as a bottom mold and a side mold. A bottom molding cavity is formed by placing the female mold in contact with the male mold or the surface of the bent inner sole protruding outer peripheral part, and then forming a bottom molding cavity in the bottom molding cavity. It is constructed by filling the molded feed and integrally molding the bottom and the midsole.

In addition, as another method for manufacturing footwear, a method for manufacturing footwear in which a part of the shoe cover is cut out is such that a bag-like body is formed from the shoe cover with a part cut out and the insole, and this bag-like body is It is fitted into a male mold whose contact part with the mold is formed as an uneven fitting part, and this male mold is placed on a bottom mold alone or on a female mold consisting of a bottom mold and a side mold. A female mold whose abutting part is shaped to fit with the concave-convex fitting part of the male mold is brought into contact with the surface of the male mold or the bent inner sole protruding outer circumferential part. It is also possible to form a molding cavity and then fill the bottom molding cavity with a bottom molding material to integrally mold the bottom and the midsole.

In the manufacturing apparatus used in the above footwear manufacturing method, the contact portion of one of the male mold and the female mold for forming the bottom part is
The mold is configured to have a hardness difference from the abutting portion of the other mold. This may be configured as a male mold in which the abutting portion of the male mold is made of a material whose hardness is lower than that of the abutting portion of the female mold.

In addition, in the abutting part of the mold, a material having rubber-like elasticity or compression plasticity may be provided in a band shape on the surface of the male mold,
Alternatively, in the case of a female mold, the contact portion may be formed by protruding from the surface of a material having rubber-like elasticity or compression plasticity.

Furthermore, so that the contact parts of the molds fit into each other,
It is also possible to provide a footwear manufacturing apparatus in which the contact portion is formed in an uneven shape.

1.] The method for manufacturing footwear with a partially cut out shoe cover is to first fit a bag-like body made by gluing a partially cut out shoe cover and an insole into a male mold, and then insert the male mold into a bag-like body. Place the mold onto the female mold.

At this time, if the contact parts of the male mold and the female mold have a difference in hardness, the male mold and the female mold will join even at the notched part of the cover during contact, and the molten thermoplastic resin will No leakage.

This is the same even if the abutting portion of either of the molds is made of a rubber-like elastic material or a material having compression plasticity.

Furthermore, by forming the abutting portions of the male mold and the female mold into concavo-convex shapes that fit into each other, no gap is created even in the notched portion of the sleeve, so that the molten thermoplastic resin does not leak.

[Examples] The present invention will be described based on drawings showing examples. 1 to 7 are cross-sectional explanatory views or partially enlarged cross-sectional explanatory views showing the contact state of the male mold for forming shoe soles and the female mold used in one embodiment of the present invention, and FIG. The figure is a perspective view from below of a bag-like body formed by gluing together a partially cut-out part of the jacket and an insole with a corresponding part cut out in the part of the jacket, and fitted into a mold, Figure 9. 1 is a perspective view from below in which the lower end portion of a partially cut-out sleeve is tied with a string and fitted into a male mold.

In this embodiment, we will take as an example a zangle-shaped footwear in which the toe part and heel part of the part of the part of the part of the part of the part of the part of the part of the toe part of the toe part of the part of the shoe part which the toe part and the heel part of the part of the shoe part are cut out are cut out and are open. The manufacturing method and manufacturing apparatus will be explained.

First, the footwear manufacturing apparatus used in this footwear manufacturing method will be explained with reference to the drawings.

The mold for forming shoe soles consists of a male mold (Last l-) (]) and a female mold (2), which move and come into contact with or fit together, so that the mold for forming shoe soles is formed between them. A cavity (7) is formed. In this example, the female mold (2) is made up of the bottom mold (2) a and the cytomold F' (2) b, but the same result can be obtained if the female mold (2) is made up of the bottom mold (2) a alone. It is. 'The bottom mold (2)a has a gate (8) opened on its bottom surface which is connected to an injection nozzle (not shown).

The male mold (]) has a partially cut out cover (3) and an insole (4).
) is fitted into the bag-like body (5).

The male mold (1) and the female mold (2) are made of materials having a sufficiently large difference in hardness, at least in their contact portions (11) and (21).

In the embodiment shown in Fig. 1, the entire female mold (2) is made of iron, steel, etc., which has relatively high hardness, and the entire male mold (1) is made of aluminum, aluminum alloy, etc., which has relatively low hardness. do.

In the embodiment shown in FIG. 2, a band-shaped body (11,) a made of a material having rubber-like elasticity or compression plasticity is placed around the male mold (1) at the abutting portion (11) of the male mold (1). It is buried and fixed on the surface. The strip (11) 2L may be provided so as to slightly protrude from the surface of the male mold (1) as shown in FIG. 2, or may be provided on the same surface as the surface of the male mold (1). It may be provided slightly recessed on the surface of the male mold (1). This protrusion is the male mold (1)
0.2-7, Omm, preferably 0.5-3 from the surface of
, about 0mm higher.

This strip (ll)a is made of a material such as heat-resistant synthetic rubber, heat-resistant resin, silicone rubber, non-stick synthetic resin, felt material, woven fabric, or knitted fabric.

In the embodiment shown in FIG. 3, a band (21) a made of the above-mentioned material having rubber-like elasticity or compression plasticity is embedded and fixed in the abutment part (21) of the female mold (2). ) contact part (
21) The surface of the band-shaped body (21)a is provided to protrude slightly from the surface, and this protrusion is 0.2~? , Omm,
Preferably, the height is set to be about 0.5 to 3 Omm higher.

In the embodiment shown in FIG. 7, the contact portion (11
), a tape-like body with rubber-like elasticity or compression plasticity (
11) Configure by pasting c. Tape-shaped body (11) c
is made of aluminum foil, non-adhesive fibrous tape or felt tape, etc. Although not shown, this tape-like body (II) c having rubber-like elasticity or compression plasticity may be attached and fixed to the contact portion (21) of the female mold (2), or may be fixed to the contact portion (21) of the male mold (I). The contact part (11) and the female mold (2
) may be attached to both of the abutting portions (21).

FIG. 4 also shows that the contact portion (11) of the male mold (1) is formed as a fitting recess (11)b, and the contact portion (21) of the female mold (2) is formed as a fitting convex portion. (2), )b, and are configured to fit into each other.

In addition to the shape shown in FIG. 4, this uneven shape may include a fitting convex portion on the male mold (1) and a fitting concave portion on the female mold (2).
It is also possible to form several layers of concavities and convexities in succession. Further, the uneven shape is not limited to a trapezoidal cross section, but may be formed in a polygonal shape such as a triangular cross section, or a semicircular uneven shape.

Furthermore, the configuration shown in FIG. 4 has a contact portion (
11) and the material of the contact part (21) of the female mold (2) are
Even if the material has a sufficient difference in hardness, it may be made of material that does not have much difference in hardness.

Alternatively, a strip-shaped body (Il,) a, (21,) a or a tape-shaped body (l]) c is attached to the fitting recess of the male mold (1) or female mold (2). It is also possible.

FIGS. 5 and 6 show other embodiments, in which a bag-like body (5) is formed by sewing a jacket (3) with a notched part and an insole (4).
This is in a different form from the one described in No. 2, in which the outer periphery of the inner sole (4) of the notch and opening of the sleeve cover (3) protrudes from the sewn part with the sleeve cover (3), and the male mold ( 1) and insert it into the female mold (2).
), the protruding portion (9) is bent upward along the side surface of the male mold (1), and its upper edge is brought into contact with the abutting portions (11) and (21). Located within the contact area.

In this case, as shown in Fig. 5, the upper edge of the protruding part (9) is sandwiched between the contact parts (11) and (21),
A airtight cavity (7) for forming a shoe sole is formed. Fifth
The figure shows that the surface of the contact part (21) of the female mold (2) is planar, but as shown in Figure 6, which shows the contact parts (11) and (21) enlarged, The surface of the abutting part (21) of ) may be formed with a step so that the two parts are higher and the lower part is lower.

This is because when the female mold (2) is brought into contact with the male mold (1) and pressed, the surface of the high upper part comes into contact with the surface of the male mold (1) and the bent protruding part (9) The two end sides of the shoe sole are sandwiched between the narrow gap between the lower part and the surface of the male mold (1), thereby forming a cavity (7) for molding a shoe sole with a reliable and firm airtight property.

Next, a method of manufacturing footwear using the above-described footwear manufacturing apparatus will be described.

Toe part (3) a and heel part (3) b are cut out (3)
are formed by sewing or stitch welding based on a predetermined shoe design. This sleeve (3) is adhesively connected to the inner sole (4) by sewing, and the bag-like body (5)
) to form. In the case of shoes with a thin sole (6), this bag-like body (5) is turned inside out and the sewn part is on the inside, but if the sole (6) has an appropriate thickness, it can be left as is. good.

The bag-like body (5) is shown in FIGS. 1 to 4 and 7 in this embodiment, in which the inner sole (4) has the same width as the upper surface of the sole (6), and 5 and 6 are wider than the upper surface of the sole (6), and the remainder is formed by the midsole (4) and the shoe cover (3), which are bent upward along the shoe cover (3). Also,
The same applies to a bag-like body (5) in which the midsole (4) is a part of the sole (6) as shown in FIG. 8, and the midsole (4) is missing as shown in FIG.

The bag-like body (5) is fitted into a male mold (last) (1) for forming the sole of a shoe by suspending the bag (3).

The male mold (1) fitted with the bag-like body (5) is placed on the female mold (2) with the inner sole (4) facing toward the female mold (2).

In this example, the female mold (2) for forming the sole of the shoe is a bottom mold (2) 2L and a pair of left and right side molds (2).
Although it is composed of bottom mold (2) a, it may be composed of a single bottom mold (2) a.

When the male mold (1) moves toward the female mold (2) and stops at a specified position, the side mold (2)b moves toward the male mold (1).
) of the female mold (2), and press the contact part (21
) and the abutting part (11) of the male mold (1) are brought into contact and pressed, and the male mold (1) and the female mold (2) form an airtight cavity for forming shoe soles (a force is formed). do.

At this time, at least the contact portion (11) of the male mold (1)
The surface material of at least the abutting part (2) of the female mold (2)
Since it is made of a material with a sufficiently large difference in hardness compared to the surface material of 1), even if it is a bag-shaped body (5) consisting of a flap (3) with a notched part, the female mold ( The abutting pressure of 2) improves the abutting state between the male mold (+) and the female mold (2), forming a highly airtight cavity for forming a shoe sole (7).

The male mold (
1), the contact portions (11) and (2) of the female mold (2), respectively.
1) A band-shaped body (1,
1,) a, (21) a or tape-shaped body (11) c
It is also possible to form a shoe sole molding cavity (7) with higher airtightness by providing a hole.

Furthermore, the male mold (1) and female mold (2) of the embodiment shown in FIG. Part (7)
may be formed.

In addition, in FIGS. 5 and 6, the outer circumferential protruding portion of the midsole (4) is bent above the surface of the male mold (1), and its two ends are brought into contact and compressed, so that the shoe has an airtight seal. Cavity for bottom molding (
7) is formed.

Next, the injection nozzle (not shown) is inserted into the bottom mold (2).
The molten thermoplastic resin, such as vinyl chloride resin, polyurethane, or thermoplastic rubber, is brought into contact with the opening end of the gate (8) of the bottom mold (2) 2L through the bottom surface of the bottom mold (2) into the sole molding cavity (7). The mixture is injected and filled, cooled and solidified, and the sole (6) is integrally molded with the midsole (4). At this time, the sole molding cavity (7) has a very high sealing property, so that the molten thermoplastic resin flows between the contact parts (11) and (2).
No more leakage than during 1).

As shown in Fig. 8, even if the bag-like body (5) is located only in the part where the insole (4) is sewn to the sleeve (3), as shown in Fig. 9, the insole (4) ) without string (10) to cover (2)
A bag-shaped body (
5), the sole (6) is similarly injection molded, and an insole (not shown) is adhesively fixed to the surface of the sole (6) from inside the shoe.

The footwear molded in this way has almost no cracks, so it becomes a finished footwear as it is.

In this example, the method and apparatus for manufacturing footwear using the injection molding method (in-ejection method) have been explained. , fill the necessary amount of thermoplastic material, for example, unvulcanized rubber, and place the male mold (1) into which the bag-shaped body (5) is inserted into the female mold (2), and It can also be applied to a method and apparatus for manufacturing footwear using a vulcanized method in which (11) and (21) are brought into contact with each other and then heated and pressurized.

Due to the contact or fitting of the male mold (1) and the female mold (2) in the above-described embodiment, the sole molding cavity (7) can achieve an extremely high sealing performance compared to the conventional example. , even if the molten thermoplastic resin is injected and filled, the contact portion (11),
(12) The thermoplastic resin does not leak and there is almost no occurrence of paris. Therefore, it is possible to manufacture footwear in which a part of the shoe cover is cut out very easily and quickly, and high quality footwear can be stably manufactured.

[Effects of invention Therefore, this invention has the following effects.

To simplify the work process in manufacturing footwear with a part of the shoelace cut out, and to efficiently manufacture footwear of stable quality with little variation in a short time.

Furthermore, unlike conventional manufacturing methods, there is no inner sole to be cut or removed, so material costs can be reduced, contributing to lower manufacturing costs.

Furthermore, since there is no work required to cut out the protruding portion, it contributes to a reduction in manufacturing costs, and it is possible to eliminate variations in the cut surface due to the cutting work, thereby providing footwear with stable quality.

[Brief explanation of the drawing]

1 to 7 show embodiments of this invention,
FIG. 2 is a cross-sectional explanatory view or a partially enlarged cross-sectional explanatory view showing a contact state between a male mold and a female mold for forming a shoe sole. FIGS. 8 and 9 show another embodiment of the bag-like body,
Figure 8 is a perspective view from below when a bag-like body formed by gluing together a partially cut-out part of the jacket and an insole with a corresponding part cut out in the part of the jacket is fitted into a male mold. 9A and 9B are perspective views from below when the lower end portion of a partially cut-out sleeve is squeezed with a string and fitted into a male mold. (1) Male mold, (11)...Abutting part of the male die, (1,1)a ・Band-shaped body, (11)b...Fitting recess, (1,1)c ・Tape-shaped body, (2)...Female mold, (2)a, Bottle mold, (2)b, Side mold, (21)...Abutment part of female mold, (2],)a Band-shaped Body, (21) b... Fitting convex part, (3)... Clamp cover, (3) a. Toe notch part of the flap cover, (3) b
- Heel notch part of the shoe cover, (4)...Insole, (5)...Bag-like body, (6)...Sole, (7)...Sole forming cavity, ( 8)...Gate, (9)...Protruding part of the middle sole, (10)...String,

Claims (8)

[Claims] (1) In a method for manufacturing footwear in which a part of the shoe cover is cut out,
A bag-like body is formed by a partially cut-out sleeve and an inner sole, and this bag-like body is fitted into a male mold whose contact portion with the female mold has a hardness difference from that of the female mold, This male mold is placed on a bottom mold alone or a female mold consisting of a bottom mold and a side mold, and the female mold is brought into contact with the male mold or the surface of the bent inner sole protruding outer peripheral part to form the bottom. A method of manufacturing footwear comprising: forming a cavity for forming a sole, then filling the cavity for forming a bottom with a bottom molding material, and integrally molding a sole and an insole. (2) In a method for manufacturing footwear in which a part of the shoe cover is cut out,
A bag-like body is formed by the partially cut-out sleeve and the inner sole, and this bag-like body is fitted into a male mold whose contact part with the female mold is formed as a concave-convex fitting part. A female mold in which a male mold is placed on a bottom mold alone or a female mold consisting of a bottom mold and a side mold, and the contact area with the male mold is shaped to fit with the uneven fitting part of the male mold. Forming a bottom molding cavity by abutting and fitting the mold onto the surface of the male mold or the bent inner sole protruding outer peripheral portion, and then filling the bottom molding cavity with a bottom molding material, A method for manufacturing footwear in which a sole and an insole are integrally molded. (3) In a footwear manufacturing device that molds the soles of footwear by injection molding or the like, the abutting part of one of the male and female molds for forming the soles is the abutting part of the other mold. Footwear manufacturing equipment that uses molds with different hardness. (4) The footwear manufacturing apparatus according to claim 3, wherein the abutting portion of the male die is made of a material whose hardness is sufficiently lower than that of the abutting portion of the female die. (5) The footwear manufacturing apparatus according to claim 3 or 4, wherein the abutting portion of the male mold is a contact portion comprising a band-like body having rubber-like elasticity or compression plasticity provided on the surface of the male mold. (6) The footwear manufacturing device according to claim 3, wherein the abutment portion of the female mold is a contact portion formed by a band-like body having rubber-like elasticity or compressive plasticity slightly protruding from the surface of the female mold. (7) The footwear manufacturing device according to claim 3 or 4, wherein the abutting portion of the male mold is a tape-like member having rubber-like elasticity or compression plasticity. (8) A footwear manufacturing device, wherein the contact portions of a male mold and a female mold for molding the sole of the footwear are contact portions formed in an uneven shape that fit into each other.