JP3209704B2 - Forming method and forming mold of design concave portion for shoe sole - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for forming a design recess or the like in an injection-molded shoe for indoor shoes, for example.

[0002]

2. Description of the Related Art Conventionally, injection-molded shoes, such as athletic shoes, in which the soles are formed in a multi-layer structure, are known. For example, the upper layer and the lower layer have different colors to enhance the design effect, Different materials are used to improve comfort and durability.

[0003]

When the sole of the shoe has a multi-layer structure of different colors, the color of the upper layer can be seen through a window (recess) or the like when the sole is viewed from the lower surface (ground surface) side. By doing so, a novel design effect can be brought out by the accent effect, and there is an effect of increasing the purchase motivation at the stage of purchasing shoes. Further, if such windows (recesses) are formed at effective locations on the sole of the shoe, cushioning properties and the like can be improved by a suction effect.

Therefore, in the present invention, for example, when a shoe sole having a multilayer structure of different colors is injection-molded, a concave portion is formed in a predetermined portion of a lower shoe sole, and the upper shoe material can be seen from the recess. It is an object of the present invention to provide a method and a mold for forming a shoe sole.

[0005]

In order to solve the above-mentioned problems, according to the present invention, there is provided a method for forming a shoe sole by clamping a bottom mold in a stepwise manner with respect to a last mold and a side mold. The space is divided into multiple layers and defined, and a shoe sole material is injected into each space to form a multi-layered sole, and a design recess is formed in a predetermined portion of the sole. The mold is raised to the upper position to define a space for molding the upper layer of the shoe sole, and at the same time, the pin body built into the bottom mold faces this space and the sole material for the upper layer is injected. Then, while keeping the position of the pin body, the bottom mold is lowered to the lower position to define a space for forming the lower layer of the shoe sole, and the sole material for the lower layer is injected into this space. I did it.

The pin body built in the bottom mold as described above faces the space for molding the upper layer of the shoe sole, and after injection molding of the sole material for the upper layer, the bottom is maintained while the position of the pin body is maintained. If only the mold is lowered to define a space for forming the lower layer, the upper surface of the pin body remains in contact with the shoe sole material for the upper layer. By injecting the sole material, the pin body becomes a punched-out window (recess), and the shoe sole material for the upper layer can be exposed from the window (recess).

According to a second aspect of the present invention, the design recess is formed in the heel of the sole. If the design concave portion is formed in the heel portion of the shoe sole in this manner, the design effect can be enhanced at a balanced position, and the cushioning property can be improved by the suction effect.

According to a third aspect of the present invention, the bottom mold is stepwise lowered with respect to the last mold and the side mold while clamping the mold so as to define the space for forming the shoe sole into a plurality of layers. Injecting shoe sole material to form a multi-layered shoe sole, and providing a molding die for molding a design concave portion in a predetermined portion of the shoe sole, as a molding die, in a predetermined portion of a bottom mold, A recess forming mechanism for forming a design recess was provided. The recess forming mechanism includes a sliding rod that penetrates a predetermined portion of the bottom mold slidably up and down, a pin body attached to the upper end side of the sliding rod and at least a part of which protrudes above the bottom mold, An urging member interposed between the pin body and the bottom mold to urge the pin body upward, and attached to a lower end side of the sliding rod; when the mold is opened by the urging force of the urging member, the bottom mold is formed. The stopper was engaged with the side mold in the mold-clamped state, and the raised position was regulated.

While the bottom mold is being raised to the upper position for mold clamping, the stopper of the concave forming mechanism is engaged with the side mold so that the pin body is not further raised. Only the bottom mold is raised by a predetermined stroke while the urging member is contracted to define a space for forming the upper layer of the shoe sole. When the shoe sole material for the upper layer is injection-molded in this space, the bottom mold is then lowered within a predetermined stroke (within the amount by which the urging member has shrunk) to return the pin body to its original position. While holding, lower the bottom mold only. Then, a space for forming the lower layer part of the sole is defined, and the material for the lower part of the sole is injected into this space and molded, and the pin body is punched into the material for the lower part of the sole. Window (recess)
Is formed.

Here, as the urging member, for example, an elastic member such as a spring or rubber, or various means such as an air cylinder can be applied.

According to a fourth aspect of the present invention, a vent forming mechanism is provided in the bottom mold in addition to the concave part forming mechanism. A plurality of pins contacting the side were provided. And the ventilation hole which penetrates a shoe sole by this pin is provided. Here, since the pin is urged by the urging member, it is possible to weaken the impact force when the pin and the last mold side come into contact with each other in mold clamping and the like, which is effective in preventing wear and the like, and is effective in preventing the pin and the last mold side. Can be reliably brought into contact with each other, so that air permeability can be ensured.

[0012]

Embodiments of the present invention will be described with reference to the accompanying drawings. Here, FIG. 1 is an explanatory view when the shoe sole is injection-molded into a multilayer structure, FIG. 2 is a bottom view of the shoe sole viewed from the grounding surface side, and FIG. 3 is a recess forming for forming a design recess in the shoe sole. FIG. 4 is an operation view of the mechanism, as viewed from the AA cross section direction in FIG. 1, and FIG. 4 is an operation view of a ventilation hole forming mechanism for forming a ventilation hole in a shoe sole.

A method and a mold for forming a design concave portion according to the present invention are a technique for forming a design concave portion (design window) in a shoe sole having a multilayer structure of, for example, athletic shoes used in a gymnasium or indoor shoes. In the shoe sole according to the embodiment, as shown in FIG. 1B, a tape portion S1 and a sole portion S2 are provided.
2, the sole S2 of the heel is stamped out to form a design recess q, as shown in FIG. The design recess q is formed by a recess forming mechanism 6 described later.

A plurality of ventilation holes t, which penetrate vertically through the tape portion S1 and the sole portion S2, are formed from the tread portion of the shoe sole S to the toe portion.
Is formed by a vent forming mechanism 5 described later.

A molding die 1 for molding a sole S is shown in FIG.
As shown in the figure, the last mold 2 on which the shell K is suspended.
And a side mold 3 defining a peripheral side surface of the sole S,
A bottom mold 4 is provided to define the contact surface side of the sole S. While changing the height of the bottom mold 4, a space for forming the sole is stepwise defined, and a shoe is formed in each space. The sole material is injected to form the shoe sole S having a multilayer structure.

That is, at the initial stage, when the bottom mold 4 is set at the upper position with respect to the last mold 2 and the side mold 3 as shown in FIG. And a tape part material injecting passage 7 communicating with the space part is formed. The tape part material is injected into the tape part forming space part through the passage 7, and a tape part of a specific color is formed. Form S1.

Next, as shown in FIG. 1B, when the bottom mold 4 is lowered by a predetermined stroke and the mold is clamped,
A space for molding the sole portion S2 and a passage 8 for injecting the sole portion material communicating with the space portion are formed, and the material of the sole portion is ejected through the passage 8 so that the color of the tape portion S1 is changed. Form sole portions S2 of different colors.

By this molding, the sole S having a two-layer structure with different colors of the tape portion S1 and the sole portion S2 is formed.
And a ventilation hole forming mechanism 5 (FIG. 4) for forming a plurality of ventilation holes t, from the tread portion of the shoe sole S to the toe portion. First, the recess forming mechanism 6 will be described.

The recess forming mechanism 6 includes a bottom mold 4
As shown in FIG. 3A, a pin hole 15 penetrating the bottom mold 4 up and down, a sliding rod 16 slidable up and down the pin hole 15, and A pin body 17 connected to the upper end of the sliding rod 16, a stopper 18 connected to the lower end of the sliding rod 16, and a spring as a biasing member interposed between the pin body 17 and the bottom mold 4. In the mold open state, the stopper 18 contacts the lower surface of the bottom mold 4 and a part of the pin body 17 protrudes upward from the upper surface of the bottom mold 4 as shown in FIG. I am trying to do it.

The side mold 3 in the vicinity of the stopper 18 is provided with a locking portion 3 for regulating the rising position of the stopper 18.
e, 3e are provided. And these locking parts 3e, 3
e is the tape portion S1 of the sole S as shown in FIG.
When the bottom mold 4 rises to the upper position to form the lower mold, the stopper 18 is engaged to regulate the rising position.
After the restriction by e and 3e, only the bottom mold 4 rises by a predetermined stroke while contracting the spring 19, so that a gap g for a predetermined stroke is generated between the lower surface of the bottom mold 4 and the stopper 18.

At this time, the upper surface of the pin body 17 and the inner bottom K1 on the side of the last mold 2 (integral with the shell K, omitted from FIG. 3;
A predetermined gap is formed between the tape member S (see FIG. 1) and the material of the tape portion S1 enters the upper portion of the pin body 17.

Then, as shown in FIG. 3 (C), after the molding of the tape portion S1 is completed, the bottom mold 4 descends by one step,
When the space for molding the sole portion S1 is defined, the gap g is eliminated or narrowed. For this reason, the pin body 17 maintains the same position with the upper surface of the pin body 17 still in contact with the lower surface of the tape part S1, and in this state, the sole part material is injected to form the sole part S2. By doing so, a design recess q with a clear window is formed only in the sole portion S2, and the tape portion S1 of a different color can be visually recognized through the design recess q.

In FIG. 3A, between the right side mold 3 and the bottom mold 4, a tape material injection passage 7 and the same gate 7a are provided, and the left side mold 3 and the bottom mold 4 are provided. The sole portion material injection passage 8 and the same gate portion 8a are provided therebetween.

Further, a rounded portion 18r is formed on the upper surface of both sides of the stopper 18, and even when the stopper 18 is inclined left and right and one end is raised, the stopper 18 can be pressed down smoothly by the locking portion 3e. Like that.

Next, the air hole forming mechanism 5 will be described. As shown in FIG. 4, the vent hole forming mechanism 5 includes a pin hole 10 penetrating the bottom mold 4 up and down,
0, the pin 11 which can slide up and down along the
The adjusting member 12 is screwed into the lower end side opening thread portion of the screw member 0, and a spring 13 as an urging member interposed between the adjusting member 12 and the pin 11 is provided.
With the urging force of 3, the tip of the pin 11 is
Project above the upper surface of the.

The amount of protrusion of the pin 11 is shown in FIG.
As shown in (A), in order to form the tape portion S1 of the shoe sole S, the tip of the pin 11 abuts on the insole K1 of the bottom surface of the last mold in a mold-clamped state in which the bottom mold 4 has risen to the upper position. At the same time, after that, the bottom mold 4 descends by a predetermined stroke, and as shown in FIG. 4 (B), continues to perform the second-stage mold clamping to form the sole portion S2 of the shoe sole S. It is made to contact K1, and the tip of the pin 11 is brought into close contact with the insole K1, so that the sole material does not enter the same portion.

The pins 11 and the springs 13 are provided at a plurality of locations corresponding to the locations where the ventilation holes t,... Are formed, so that the injection molding of the tape portion S1 and the sole portion S2 is completed. Then, the location of each pin 11 becomes a through hole into which the shoe sole material does not enter, and is formed as a ventilation hole t,. Incidentally, the midsole K1 is made of a material having air permeability.

The urging force of these pins 11 can be adjusted by an adjusting member 12. That is, if the adjustment member 12 is screwed in and the spring 13 is compressed,
The upward urging force of the pin 11 is increased,
If the compression force of the spring 13 is reduced by the
Is weakened. Such adjustment is performed, for example, when the material of the sole enters through the gap between the tip of the pin 11 and the insole K1 and the ventilation holes t,... Are crushed, or when the thickness of the sole S is increased. , The urging force of the pin 11 is increased.

A method of forming a shoe sole in the above-configured mold will be described. The last mold 2, the side mold 3, and the bottom mold 4 are clamped to first define a space for forming the tape portion S1, as shown in FIG. At this time, the bottom mold 4 is set at the upper position, and the stopper 18 of the recess forming mechanism 6 is moved to the position shown in FIG.
As shown in (1), the pin body 17 is engaged with the locking portions 3e, 3e of the side mold 3, and faces the predetermined position in the space for forming the tape portion S1. Further, as shown in FIG. 4A, the pin 11 of the ventilation hole forming mechanism 5 is in contact with the inner bottom K1 of the last mold 2 side.

Then, a tape material of a predetermined color is injected through the tape material injection passage 7, and the tape portion S1 of the shoe sole S is formed.
Is molded.

Next, as shown in FIG. 1 (B), the bottom mold 4 is lowered to the second stage and clamped to define a space for molding the sole portion S2. At this time, as shown in FIG. 3 (C), the upper surface of the pin body 17 of the recess forming mechanism 6 is in contact with the tape portion S1 while maintaining the original position.
Further, as shown in FIG. 4B, the pin 11 of the ventilation hole forming mechanism 5 remains in contact with the midsole K1.

Then, a sole material having a color different from that of the tape portion S1 is injected through the sole material injection passage 8,
A sole portion S2 integral with the tape portion S1 is formed.

Then, when the tape portion S1 and the sole portion S2 form the integral shoe sole S, the mold is opened. Then, in the heel portion of the shoe sole S, the design concave portion q in which the tape portion S1 can be visually recognized is formed by the pin body 17 of the concave portion forming mechanism 6. And the design effect can be enhanced by the design concave portion q, and the cushioning property can be improved by the suction effect. Also, the plurality of pins 11,... Of the ventilation hole forming mechanism 5 are formed as ventilation holes t,.

According to such a molding method, the design concave portion q can be obtained simply by lowering the bottom mold 4 by a predetermined stroke.
If the color of the shoe sole material of each layer is made different, a very novel design effect can be obtained by the design concave portion q, and the cushion effect and the like can be obtained by providing it in the heel portion. Can be improved.

The present invention is not limited to the above embodiment. Those having substantially the same configuration as that described in the claims of the present invention and exhibiting the same effects are included in the technical scope of the present invention. For example, the shoe sole S may be a single layer instead of a multilayer, or a multilayer of three or more layers. Further, the urging member of the recess forming mechanism 6 may be an elastic member or the like other than the spring 13.

[0036]

As described above, according to the method and the mold for forming a design concave portion of the present invention, the space portion for forming the sole of the shoe is divided into multiple layers to define the space portion. In a method of forming a multi-layered sole by injecting a sole material, the bottom mold is raised to a position defining a space for molding a sole upper layer, and a pin body incorporated in the bottom mold is formed. Into the space, inject the sole material for the upper layer, and lower the bottom mold to the lower position while maintaining the position of the pin body to define a space for molding the lower layer of the shoe sole. Since the sole material for the lower layer portion is injected, a concave portion in which the material for the lower layer portion is punched out with a pin body can be formed, and the design effect can be enhanced.

Further, when the design concave portion is formed in the heel portion of the shoe sole, the design effect can be improved and the cushion effect can be improved by the suction effect. Further, if the concave forming mechanism is provided in the bottom mold, a mechanism for lowering the bottom mold by a predetermined stroke while maintaining the position of the pin body can be easily configured. In addition, if the bottom mold is provided with a vent forming mechanism in addition to the recess forming mechanism in the bottom mold, it is possible to provide shoes with good air permeability at the same time.

[Brief description of the drawings]

FIG. 1 is an explanatory view when injection molding a shoe sole into a multilayer structure.

FIG. 2 is a bottom view of the shoe sole as viewed from the ground contact side.

FIG. 3 is an operation view of a concave portion forming mechanism for forming a design concave portion on a shoe sole, as viewed from a cross-sectional direction along the line AA in FIG. 1;

FIG. 4 is an operation diagram of a vent forming mechanism for forming a vent in a shoe sole;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Mold, 2 ... Last mold, 3 ... Side mold, 4 ... Bottom mold, 5 ... Vent hole forming mechanism, 6 ... Depressed part forming mechanism, 11 ... Pin, 13 ... Spring, 16 ... Sliding rod, 17 ... Pin Body, 18 ... Stopper, 19 ... Spring, S ... Shoe sole, S1 ... Tape part, S2 ... Sole part, q
... Design recesses.

Claims (4)

(57) [Claims] 1. A bottom mold is stepwise lowered with respect to a last mold and a side mold while clamping the mold so as to define a space portion for forming a shoe sole into a plurality of layers, and each space portion has a shoe sole material. And forming a multi-layered shoe sole and forming a design concave portion in a predetermined portion of the shoe sole, wherein the bottom mold is raised to a position at an upper level to thereby form a shoe sole upper layer portion. A step of defining a space for molding, simultaneously injecting a pin body incorporated in the bottom mold into this space, and injecting a shoe sole material for the upper layer, and maintaining the position of the pin body while maintaining the position of the pin body. Lowering the bottom mold to a lower position to define a space for forming a lower layer portion of the sole, and injecting a sole material for the lower layer into the space portion. Method for forming a design recess. 2. The method according to claim 1, wherein the design recess is formed in a heel portion of a shoe sole. 3. The bottom mold is clamped while gradually lowering the bottom mold with respect to the last mold and the side mold to define a space portion for forming a shoe sole in a plurality of layers, and each space portion has a shoe sole material. A mold for forming a multi-layered shoe sole by injecting the same, and forming a design concave portion in a predetermined portion of the shoe sole, wherein the predetermined portion of the bottom mold has a design concave portion. A concave rod forming mechanism is provided, the concave part forming mechanism includes a sliding rod that penetrates a predetermined portion of the bottom mold in a vertically slidable manner, and is mounted on an upper end side of the sliding rod and at least a part is provided on the bottom mold. A protruding pin body, an urging member interposed between the pin body and the bottom mold for urging the pin body upward, and attached to a lower end side of the sliding rod, the urging force of the urging member Engage with bottom mold when opening mold And a stopper that engages with the side mold in a clamped state and regulates a rising position. 4. The mold according to claim 3, wherein the bottom mold is provided with a vent forming mechanism in addition to the recess forming mechanism, and the vent forming mechanism is urged upward by an urging member. A molding die comprising a plurality of pins whose tip portions abut on a last mold side in a mold-clamped state.