JP3577429B2 - Method and apparatus for manufacturing injection molded shoes - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method and an apparatus for manufacturing an injection-molded shoe , and more particularly, to a method and an apparatus for efficiently manufacturing an injection-molded shoe having a vent hole formed in an outsole and having high air permeability.
[0002]
[Prior art]
Injection-molded shoes are shoes whose outsole is welded to a shell and an insole and are integrally formed by injection molding, and are generally known as sports shoes, walking shoes, business shoes, and the like. Further, as this type of injection-molded shoe, an injection-molded shoe in which a plurality of ventilation holes are formed in the outsole to suppress an increase in temperature and humidity inside the shoe is also known.
[0003]
In the manufacture of the above-mentioned injection-molded shoes, the outsole is usually injection-molded using an injection mold composed of a bottom mold, a side mold and a last mold.
At this time, a shell with an inner bottom sewn is attached to the last mold, and the edge portion is pressed against the outer surface of the shell by closing the side mold.
Then, a molten resin such as polyurethane is injected into a cavity formed between the bottom mold, the side mold, and the last mold, so that the outsole is welded to the shell and the midsole and integrally formed. .
In addition, as a subsequent step, an insole is usually bonded to the surface of the insole.
[0004]
[Problems to be solved by the invention]
By the way, in the above-mentioned injection-molded shoe in which a plurality of vents are formed in the outsole, each vent is constituted only by a vertical vent from the midsole to the grounding surface of the outsole.
In this case, since each ventilation hole is opened to the outside air only through the opening of the grounding surface on the outsole, it is a fact that the ventilation is not sufficient.
Therefore, in the conventional injection-molded shoes, the air permeability of the outsole is low, and as a result, the rise in temperature and humidity inside the shoe cannot be sufficiently suppressed.
[0005]
An object of the present invention is to provide a manufacturing method and a manufacturing apparatus capable of efficiently manufacturing an injection-molded shoe that has high air permeability of an outsole and can sufficiently suppress an increase in temperature and humidity inside the shoe.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, an injection-molded shoe manufactured by the manufacturing method and the manufacturing apparatus of the present invention is an injection-molded shoe in which an outsole is welded to a shell and a middle sole and is integrally injection-molded, In the outsole, a plurality of vertical ventilation holes from the midsole to the ground contact surface of the outsole, and a plurality of horizontal ventilation holes from the vertical ventilation holes to the outer peripheral side surface of the outsole are formed. I do.
At this time, if the insole is made of a material having air permeability, better air permeability can be secured.
[0007]
In the above-described injection-molded shoe, the outside air on the ground contact surface side and the outside air on the outer peripheral side communicate with the inside of the outsole through the plurality of vertical ventilation holes and the horizontal ventilation holes formed in the outsole. Vent with. Thereby, the temperature rise inside the shoe is suppressed.
At this time, if the insole has air permeability, the inside of the shoe itself passes through the insole, the plurality of vertical ventilation holes and the horizontal ventilation holes, and the ground contact side and the outer peripheral side of the outsole. The shoe is opened to the outside air, so that the rise in temperature and humidity inside the shoe can be further suppressed.
[0008]
On the other hand, the method for manufacturing an injection-molded shoe according to the present invention is a method for welding an injection-molded shoe, which is molded using an injection mold including a bottom mold, a side mold, and a last mold , by welding to a shell and a midsole. the outsole is injection molded, and a plurality of longitudinal air holes extending from the midsole to the ground plane of the bottom, injection molding shoes simultaneously forming a plurality of Yokodori pores leading to the outer peripheral side surface of the bottom from the vertical vent The method of manufacturing
The bottom mold is provided with a plurality of vertical pins for forming vertical vent holes that can elastically contact an inner bottom attached to the last mold together with the shell,
The side mold is provided with a plurality of horizontal ventilation hole forming horizontal pins that can elastically contact the outer peripheral surface of the vertical pin,
The tip of the horizontal pin is an arc surface that can make surface contact with the outer peripheral surface of the vertical pin,
The vertical pin is formed with a guide slope that reduces the diameter of the pin toward its tip,
After closing the side mold with respect to the last mold, by closing the bottom mold, an injection molding device is used in which the tip of the horizontal pin is guided to the outer peripheral surface of the vertical pin along the guide slope. It is characterized by the following.
[0009]
In the method for manufacturing an injection-molded shoe of the present invention, since a plurality of vertical ventilation holes and horizontal ventilation holes are formed simultaneously during the injection molding of the outsole, a separate step (for example, a step of drilling holes) is required. It becomes unnecessary and the production efficiency is good.
[0010]
Further, the injection-molded shoe manufacturing apparatus according to the present invention includes an injection mold including a bottom mold, a side mold, and a last mold.
The bottom mold is provided with a plurality of vertical pins for forming vertical vent holes that can elastically contact the inner bottom attached to the last mold together with the shell,
The side mold is provided with a plurality of lateral pins for forming lateral vent holes that can elastically contact the outer peripheral surface of the vertical pin ,
The tip of the horizontal pin is an arc surface that can make surface contact with the outer peripheral surface of the vertical pin,
The vertical pin is formed with a guide slope that reduces the diameter of the pin toward its tip,
After closing the side mold with respect to the last mold, by closing the bottom mold, the tip of the horizontal pin is guided to the outer peripheral surface of the vertical pin along the guide slope .
[0011]
In the injection molding shoe manufacturing apparatus of the present invention, when the outsole is injection-molded, the plurality of vertical pins elastically contact the midsole, and the plurality of horizontal pins elastically contact the outer peripheral surface of the vertical pin. A plurality of vertical ventilation holes extending from the vertical ventilation hole to the ground surface of the outsole and a plurality of horizontal ventilation holes extending from the vertical ventilation hole to the outer peripheral side surface of the outsole are surely formed.
[0012]
In the injection-molded shoe manufacturing apparatus of the present invention, if an arc surface capable of surface contact with the outer peripheral surface of the vertical pin is formed at the tip of the horizontal pin, the lateral vent hole is misaligned during injection molding of the outsole. This is preferable because it is continuous with the vertical ventilation holes without generation.
Also, if a guide slope is formed to guide the arc surface at the tip of the horizontal pin to the outer peripheral surface along the axial direction of the vertical pin, the outer peripheral surface of the vertical pin will be This is preferable because the pin is securely elastically contacted and the horizontal ventilation hole is surely connected to the vertical ventilation hole.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the manufacturing method and a manufacturing apparatus of an injection molding shoe according to the present invention with reference to the drawings.
FIG. 1 is a cross-sectional view of an injection mold as a manufacturing apparatus used in a method of manufacturing an injection-molded shoe, FIG. 2 is a longitudinal sectional view of the injection mold, and FIG. 3 is attached to a bottom mold of the injection mold. FIG. 4 is an enlarged perspective view of a contact portion between a vertical pin and a horizontal pin attached to a side mold, and FIG. 4 is a cross-sectional view showing a ventilation function of a vertical ventilation hole and a lateral ventilation hole formed on an outsole of an injection-molded shoe. 5 is a perspective view showing the appearance of the injection-molded shoe as viewed from the outsole contact surface side.
[0014]
First, an injection mold as a manufacturing apparatus used in the method of manufacturing an injection molded shoe of the present invention will be described.
As shown in FIGS. 1 and 2, the injection molding die includes a bottom mold 1 forming a ground contact surface of an outsole of an injection molded shoe, and a pair of left and right side molds 2 and 2 forming an outer peripheral side surface of the outsole. And a last mold 3 to which a shell and an insole of the injection molded shoe are attached.
[0015]
Edge portions 2A, 2A protruding inward toward the last mold 3 side are continuously formed on the upper portions of the side molds 2, 2.
A gate 2B and a sprue 2C communicating with the cavity 4 are formed on the mating surface of the side molds 2 and 2 located on the heel side of the last mold 3.
[0016]
As a component of the injection-molded shoe, a shell 6 to which an insole 5 is sewn in advance is attached to the last mold 3.
[0017]
The edge portions 2A, 2A of the side molds 2, 2 are positioned so as to be pressed against the outer surface of the shell 6 mounted on the last mold 3 when the side molds 2, 2 are closed.
[0018]
The bottom mold 1 is provided with a plurality of vertical pins 7 that can elastically contact the midsole 5 mounted on the last mold 3.
The vertical pin 7 has a brim 7A at the base end, and a small diameter contact portion 7C that is continuous via a tapered guide slope 7B at the tip end (see FIG. 3).
[0019]
The bottom mold 1 is provided with a guide hole 1A in which the vertical pin 7 is slidably fitted so that the vertical pin 7 is prevented from coming off by engagement with the collar 7A and is slidably fitted in the vertical direction. An accommodation hole 1B for accommodating the collar 7A of the vertical pin 7 is formed.
In addition, a coil spring 9 is interposed between a push screw 8 screwed into the housing hole 1B and a flange 7A of the vertical pin 7, so that a contact portion 7C of the vertical pin 7 is formed on the inner bottom of the last mold 3. 5 is configured to be capable of elastic contact.
[0020]
Similarly, the left and right side molds 2 and 2 are provided with a plurality of horizontal pins 10 which can elastically contact the outer peripheral surface of the vertical pins 7 provided on the bottom mold 1. The horizontal pin 10 has a brim 10A at a base end, and a circular arc surface 10B that can make surface contact with the outer peripheral surface of the vertical pin 7 at a distal end (see FIG. 3).
[0021]
Guide holes into which the horizontal pins 10 are slidably fitted are provided in the side molds 2 and 2 so that the horizontal pins 10 are prevented from coming off by engagement with the flanges 10A and are slidably fitted in the left-right direction. An accommodation hole 2E for accommodating the 2D and the brim 10A of the horizontal pin 10 is formed.
Further, the coil spring 12 is interposed between the set screw 11 screwed into the accommodation hole 2E and the flange 10A of the horizontal pin 10, so that the arc surface 10B at the tip of the horizontal pin 10 is fixed to the outer periphery of the vertical pin 7. The surface is configured to be capable of elastic contact.
[0022]
The plurality of vertical pins 7 protrude along the closing direction of the bottom mold 1 and are arranged in a staggered pattern at portions of the outsole excluding the stepped portion and the heel portion to be injection-molded. On the other hand, the plurality of horizontal pins 10 protrude along the closing direction of the side molds 2 and 2 and are arranged so as to be able to elastically contact the outer peripheral surface of the vertical pin 7 disposed near the outer peripheral side surface of the outsole.
[0023]
The spring constant of the coil spring 12 for urging the horizontal pin 10 is set so that the horizontal pin 10 can be smoothly contracted following the upward movement of the vertical pin 7 accompanying the closing of the bottom mold 1. It is set lower than the spring constant of the energizing coil spring 9.
[0024]
The insole 5 constituting the injection molded shoe is made of a woven or non-woven fabric such as a knitted fabric or a pile fabric, and has a sufficient air permeability.
[0025]
The cap 6 is made of woven fabric, non-woven fabric, or synthetic leather, natural leather, or the like.
The base of the cap 6 is fixed to the peripheral portion of the midsole 5 by appropriate means such as sewing or bonding.
Although not shown, an insole may be bonded to the surface of the insole 5.
[0026]
Next, a method for manufacturing the injection molded shoe of the present invention will be described. In this manufacturing method, the outsole of the injection-molded shoe is injection-molded using the above-described bottom mold 1, side molds 2, 2 and last mold 3.
[0027]
In injection molding of the outsole, first, as shown in FIGS. 1 and 2, the midsole 5 and the cover 6 are attached to the last mold 3.
Subsequently, the side molds 2, 2 are closed in the left-right direction, and the edge portions 2A, 2A are pressed against the outer surface of the base of the shell 6.
Then, the bottom mold 1 is closed upward and the contact portion 7C at the tip of each vertical pin 7 is brought into elastic contact with the inner bottom 5 mounted on the last mold 3.
[0028]
When the bottom mold 1 is closed, the vertical pin 7 in contact with the arc surface 10B at the tip of the horizontal pin 10 engages the guide slope 7B at the tip with the arc surface 10B. 7 along the axial direction.
As a result, the arc surface 10B of the horizontal pin 10 reliably makes surface contact with the outer peripheral surface of the vertical pin 7.
[0029]
After the side molds 2 and 2 and the bottom mold 1 are closed, the molding resin at the bottom is injected into the cavity 4 from the sprue 2C via the gate 2B, and the bottom is molded into the cavity 4.
In addition, as the molding resin of the outsole, a urethane resin, a vinyl chloride resin, a thermoplastic resin, an olefin resin, or the like can be used.
[0030]
In the injection molded shoe of the present invention in which the outsole is injection-molded in this manner, as shown in FIG. 4, a plurality of vertical ventilation holes 13A extending from the middle sole 5 to the ground surface of the outsole 13, A plurality of horizontal ventilation holes 13B reaching the outer peripheral side surface of the bottom 13 are integrally formed with the main bottom 13, and the horizontal ventilation holes 13B are continuous with the upper portions of the vertical ventilation holes 13A without displacement.
Then, as shown in FIG. 5, each vertical vent 13A opens to the ground surface of the bottom 13 and is open to the outside air, and each horizontal vent 13B opens to the outer peripheral side surface of the bottom 13 to open to the outside. You.
[0031]
Therefore, in the injection molded shoe of the present invention, when the temperature or humidity of the internal space of the shoe rises, the air in the internal space passes through the insole 5 and the plurality of vertical ventilation holes 13A and the horizontal ventilation holes 13B are formed. The air is discharged to the outside air on the ground contact surface side and the outer peripheral side surface side of the outsole 13, so that an increase in temperature and humidity in the internal space of the shoe can be sufficiently suppressed.
[0032]
In addition, in the injection molded shoe of the present invention, the diameters of the vertical ventilation holes 13A and the horizontal ventilation holes 13B formed in the outsole 13 are as follows in order to prevent clogging and ensure sufficient air permeability. It is preferably about 5 to 5.0 mm.
In addition, the arrangement of the vertical ventilation holes 13A and the horizontal ventilation holes 13B is not limited to the illustrated example, and may be an appropriate arrangement.
[0033]
【The invention's effect】
As described above, in the injection-molded shoe obtained by the manufacturing method and the manufacturing apparatus of the present invention, the temperature rise inside the shoe is suppressed by the plurality of vertical ventilation holes and the horizontal ventilation holes formed in the outsole.
At this time, if the insole has air permeability, the insole having air permeability is opened to the outside air on the ground surface side and the outer peripheral side surface side of the outsole through the plurality of vertical air holes and the horizontal air holes. Therefore, it is possible to sufficiently suppress an increase in temperature and humidity in the internal space of the shoe.
[0034]
On the other hand, according to the method for manufacturing an injection-molded shoe of the present invention, when the outsole is injection-molded, a plurality of vertical pins attached to the bottom mold and a plurality of horizontal pins attached to the side mold form a plurality of vertical pins. The vent and the lateral vent can be formed simultaneously.
Therefore, the injection molded shoe of the present invention, which has high air permeability of the outsole and can sufficiently suppress the rise in temperature and humidity inside the shoe, can be efficiently manufactured.
[0035]
According to the injection-molded shoe manufacturing apparatus of the present invention, when the outsole is injection-molded, a plurality of vertical pins elastically contact the middle sole and a plurality of horizontal pins elastically contact the outer peripheral surface of the vertical pin. A plurality of vertical ventilation holes extending from the middle sole to the ground contact surface of the bottom sole and a plurality of horizontal ventilation holes extending from the vertical ventilation holes to the outer peripheral side surface of the bottom sole can be reliably formed.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an embodiment of an injection mold as a manufacturing apparatus used in a method for manufacturing an injection-molded shoe according to the present invention.
FIG. 2 is a longitudinal sectional view of an injection mold according to one embodiment.
FIG. 3 is an enlarged perspective view of a contact portion between a vertical pin attached to a bottom mold of an injection molding die and a horizontal pin attached to a side mold.
FIG. 4 is a cross-sectional view showing the ventilation function of a vertical vent and a lateral vent formed in the outsole of the injection-molded shoe.
FIG. 5 is a perspective view showing an appearance of the injection-molded shoe as viewed from the outsole contact surface side.
[Explanation of symbols]
1: bottom mold 1A: guide hole 1B: accommodation hole 2: side mold 2A: edge 2B: gate 2C: sprue 2D: guide hole 2E: accommodation hole 3: last mold 4: cavity 5: middle bottom 6: cap 7 : Vertical pin 7A: Collar 7B: Guide slope 7C: Contact portion 8: Set screw 9: Coil spring 10: Horizontal pin 10A: Collar 10B: Arc surface 11: Set screw 12: Coil spring 13: Outer bottom 13A: Vertical ventilation hole 13B: horizontal ventilation hole

Claims (2)

Using an injection mold consisting of a bottom mold, a side mold and a last mold, a plurality of parts from the midsole to the ground surface of the outsole are welded to the shell and the midsole and are integrally molded by injection molding. A method for manufacturing an injection-molded shoe, in which a vertical ventilation hole and a plurality of horizontal ventilation holes extending from the vertical ventilation hole to the outer peripheral side surface of the outsole are simultaneously formed,
The bottom mold is provided with a plurality of vertical pins for forming vertical vent holes that can elastically contact an inner bottom attached to the last mold together with the shell,
The side mold is provided with a plurality of horizontal ventilation hole forming horizontal pins that can elastically contact the outer peripheral surface of the vertical pin,
The tip of the horizontal pin is an arc surface that can make surface contact with the outer peripheral surface of the vertical pin,
The vertical pin is formed with a guide slope that reduces the diameter of the pin toward its tip,
After closing the side mold with respect to the last mold, by closing the bottom mold, an injection molding device is used in which the tip of the horizontal pin is guided to the outer peripheral surface of the vertical pin along the guide slope. A method for producing an injection-molded shoe, characterized in that: It is a manufacturing apparatus used for the manufacturing method of the injection molded shoe according to claim 1,
Equipped with an injection mold consisting of a bottom mold, side mold and last mold,
The bottom mold is provided with a plurality of vertical pins for forming vertical vent holes that can elastically contact an inner bottom attached to the last mold together with the shell,
The side mold is provided with a plurality of horizontal ventilation hole forming horizontal pins that can elastically contact the outer peripheral surface of the vertical pin,
The tip of the horizontal pin is an arc surface that can make surface contact with the outer peripheral surface of the vertical pin,
The vertical pin is formed with a guide slope that reduces the diameter of the pin toward its tip,
After closing the side mold with respect to the last mold, by closing the bottom mold, the tip of the horizontal pin is guided to the outer peripheral surface of the vertical pin along the guide slope. Equipment for manufacturing molded shoes.

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