JPH05329003A - Method and device for forming shoe sole integrally with shoe shaft - Google Patents

Abstract

PURPOSE: To integrally form a sole with a grounding sole, a shaft sole, and a sole having an intermediate sole without additional expenses for tools and especially controlling. CONSTITUTION: To form a grounding sole, a shaft sole, and an intermediate sole to combine the grounding sole and the shaft sole integrally with shoe shaft 18, the grounding sole and the shaft sole are formed in a first method step using two side mold parts 11, a shell shaped sole pressing bed, a wood block 17 covered on the shoe shaft 18 set on the side mold parts 11, and an insertable mold plate 2 to divide an opening port of the side mold part 11 occupying a block position into two mold hollow rooms. After taking out mold plate 2, the intermediate sole is formed in a second method step integrally forming with the grounding sole and the shaft sole.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for integrally molding a sole with a shoe shaft, the sole having a ground sole, a shaft sole and an intermediate sole connecting the ground sole and the shaft sole. The present invention relates to a shoe last (tool) for carrying out this method.

[0002]

In the present invention, as a shoe shaft, a prefabricated shoe shaft made of leather, a fiber material, an elastomer and a thermoplastic material, and a shoe mold before the shoe sole is integrally molded. A shoe shaft is used that is manufactured in the tool and then the shoe sole is integrally molded to the shoe shaft.

Further in the present invention, a shoe shaft is made from a mixture of isocyanate and polyol which is injection molded from plasticized and grained polyurethane, polyvinyl chloride, etc. or reacts to form polyurethane. A shoe shaft made of a thermoplastic material is used.

Further, in the present invention, as the shoe shaft, shoe shafts for short shoes and boots, shoe shafts for boots, sports shoes, football shoes, usually knitted shoes, and shoe shafts for work shoes and work boots are used. It

Further according to the invention, the sole comprises a sole made of a thermoplastic material such as polyvinyl chloride (PVC) or a plasticized and grained polyurethane, and reacts to form polyurethane. A shoe sole made from a mixture of isocyanates and polyols is used.

Quite simply, shoes, boots, etc. have an integrally molded sole consisting of only one material, ie:
It has a grounded sole made of wear resistant material.

A drawback of normally wear resistant materials is that they have virtually no cushioning properties, so that shocks or vibrations due to terrain relief during walking or running are transmitted to the spine virtually unbuffered. Especially. For this reason, such single-layer soles are preferably used for work shoes and work boots.

It is known to place an intermediate sole between the grounded sole and the shoe shaft in order to obtain a cushioning effect on the sole. Although the wear resistance of this middle shoe sole is slight,
This midsole has high elastic and cushioning properties and is therefore also called a comfortable sole.

The intermediate sole known from the two-layer sole is hereinafter referred to as a shaft sole. This is because the middle sole connects the ground sole and the shaft. Furthermore, the shaft sole may be made of a non-cushioning material.

In addition, a two-layer shoe sole made of rubber is known (German published patent application DE 2 048 596 A1), which is integrally molded on the shoe shaft in the following way: In the first method step, a shaft sole or a comfortable sole made of a rubber material having a cushioning effect is integrally formed on the shoe shaft, and then the second step is performed.
So that the shaft sole or the comfort sole may be injection-molded in the method step in the manner of a wear-resistant but slightly cushioned or non-buffered wear-resistant grounding sole. Is integrally formed with the shoe shaft.

Furthermore, in the first method step, the shaft sole or the comfortable sole is likewise integrally formed with the shoe shaft, and then in the second method step, the shaft sole or the comfortable sole is integrally formed. It is also known to inject the material for the ground sole into a notch formed in between, which is frame-like surrounded by the material of the shaft sole or the comfort sole (German published patent application 1).
485987). If different colors of material are used, the ground plane has an area bordered by the color of the last material to be attached.

Further, first, a grounding shoe sole having lateral edges is manufactured, and a shoe shaft covered with a wooden mold is placed on the upper limit portion of the lateral edges, and is provided in the grounding sole. It is known from DDR-PS 64882 to supply material for shaft soles or comfort soles into the intermediate chamber defined by the shaft sole and the ground sole through the cutouts provided. ..

It is likewise known from DDR-PS 64882 to form ground soles and then shaft soles from material sections, for example from rubber plates.

Further reacting to form polyurethane,
A two-layered sole from a mixture of isocyanate and polyol is grounded in the second method step after the shaft sole or comfort sole is integrally molded on the shoe shaft in the first method step and the mixture reacts with polyurethane. It is also known from DE 202 22 118 to manufacture the sole so that it is integrally molded.

Further reacting to form polyurethane,
When making a two-layer shoe sole from a mixture of isocyanate and polyol, first form the grounded shoe sole, then the shaft between the grounded shoe sole and the intermediate chamber formed between the shaft covered by the wooden mold. The formation of shoe soles or comfort soles is also known from DBP 2241493.

In order to form the two sole layers, the reaction mixture is fed in suitable amounts to a mold cavity or tool cavity having a volume greater than that of the ground or midsole. This volume is reduced to the volume of the sole layer after supplying the respective reactive mixture.

All of the above methods have in common that first of all a hard or abrasion resistant sole is produced, and only then is an elastic, ie softer sole layer compared to a grounded sole. This is because the soft material of the shaft sole or comfort sole is uncontrollably compressed during the integral molding of the grounded sole on the already produced shaft sole or comfort sole.

The tool used as a mold for shaping the shoe sole on the shoe shaft very simply comprises two side mold parts each having one turning part, a bottom pressure table and a wooden mold. (German Federal Patent Application Publication No. 204
8596 and German Patent 1729
141 and German Patent Publication No. 3516280).

In the closed position of the side mold part, the turning part forms an opening which laterally limits the mold cavity for the sole which is integrally molded on the shoe shaft.

A bottom pressure table, which is height-adjustably guided in the opening, forms a lower limit of the mold cavity and is arranged on the side mold part which occupies the closed position. The covered shoe shaft forms the upper limit of the mold cavity.

The contact surface of the side mold part is provided with a groove-shaped notch extending in a direction perpendicular to the movement direction of the bottom pressure table, and the notch is injected at the closed position of the side mold part. The material is provided to form a passageway and to form a ground or shaft sole through the injection passageway.

In this tool configuration, the dividing surface between the shaft sole and the grounding sole and the grounding surface of the grounding sole extend in parallel with each other, and the height of the bottom pressing table is three-dimensional. It matches the geometric shape.

Furthermore, it is also known to arrange a wooden mold for shoe shafts on a height-adjustable rotary head having a corresponding pressure table in addition to the wooden mold (DDR-PS 64882 and DBP 2241493).

To mold the grounded sole, the corresponding pressure table projects into the opening to form the upper limit of the mold cavity for the grounded sole and to mold the grounded sole. The corresponding pressure table blocks the injection passage for supplying the material for the shaft sole.

When the ground sole placed on the bottom pressure table is hardened after the material for the ground shoe sole is supplied, the bottom pressure table is moved upward by a predetermined value and the intermediate shoe. Block the injection hole for feeding the bottom material.

After the grounded shoe sole has hardened sufficiently, the side mold part moves away and the rotary head moves upwards and swivels, so that the shoe shaft covered wooden mold is placed on the bottom pressure table. Oriented towards the grounded sole.

Since the rotary head is moved after closing the side mold part, the shoe shaft covered with the mold forms the sealed upper limit of the mold cavity for the shaft sole to be molded. To do.

Material for the midsole or comfort sole is supplied through the filling hole for the midsole.

The rotary head is then moved up with the finished shoe and the finished shoe is removed from the mold.

Furthermore, tools with a rotary head having two bottom pressure beds are known. The two bottom pressure platforms form a height-adjustable and pivotable structural unit called a pivotable bottom pressure platform.

By using the counter pressure table and one bottom pressure table, the grounded sole was molded and finally covered by the replacement of the intermediate shoe sole and then the bottom pressure table. By exchanging the shoe sole with a wooden mold, the shaft sole is molded.

In this way, the three-layered sole is integrally formed on the shoe shaft.

In general, it is possible to make a grounded sole with a notch, into which the material of the intermediate layer to be subsequently manufactured is pressed, so that the grounded surface of the grounded sole has a range of different colors if necessary. It is possible to have

It is also known to arrange two pairs of side mold parts at different heights from each other (US Pat. No. 4).
No. 090831).

The upper pair of bilateral mold parts cooperate with the shoe shaft over the wooden mold and the ground sole located on the bottom pressure table in the manner described above for molding the shaft sole. ..

A lower pair of side mold parts of the side mold part is used to mold the ground sole, the side mold parts being respectively 1 on the upper pair facing end faces of the side mold parts. It has two L-shaped legs. In the closed position of the lower side mold part, the L-shaped legs close the opening in the direction of the upper side mold part and fulfill the function of a corresponding pressure table during ground sole molding.

During molding of the ground shoe sole, the corresponding pressure table cooperates with the lower side mold part occupying the closed position, which is then brought into the open position, so that the bottom part is added. The platform is brought into a working position with a grounded sole molded on the bottom platform, in which working platform the bottom platform cooperates with the upper side mold part to mold the shaft sole. ..

The tool is integrated with the drive member to form a work station, the work stations being arranged in a row in a production line or the work stations being a rotary table device on a rotary table. Is located in.

The production line and the turntable device allow in principle a reasonable production time for shoes, boots, etc.

The present invention relates to integrally molding a sole on a shoe shaft as described below, wherein the sole has a ground sole, a shaft sole and an intermediate sole and the sole is thermoplastic. Of materials or react to form polyurethane,
Formed from a mixture of isocyanate and polyol.

As is well known when treating mixtures of isocyanates and polyols which react to form polyurethanes, said mixtures are mixed to form the sole layer (ground sole, shaft sole and midsole). At the start, and thus at the beginning of the transfer into the mold cavity, the mixture is placed in the respective split joint surfaces, e.g. between the side mold parts, even if the mold components or the tools are manufactured with superior accuracy. The difficulty arises of having a slight viscosity such that it penetrates into the split plane.

For molding shoe soles from a mixture of isocyanates and polyols which react for this reason to form polyurethanes (DBP 2241493), a bottom pressure table called a shell-type bottom pressure table is used. That is to say, a bottom pressure table having an annular edge and forming a so-called shell body is used.

At this edge, a corresponding pressure table is supported by an annular edge, in which case a shell-type bottom pressure table and a corresponding pressure table (so-called shell-type pressure table) have edges. Contact each other to limit the mold chamber for the grounded sole.

The edges of the bottom pressure table are pulled away from the edges of the corresponding pressure table in order to supply the material which reacts into this mold chamber to form polyurethane, both sides occupying the closed position in this case. The mold portion limits the pouring passage for the material to be supplied for the ground shoe sole to be molded and the shell-shaped bottom pressure table occupying this position opens the pouring passage so that the material to be supplied is shell-shaped. It can be supplied to the pressure table.

When a predetermined amount of material is supplied to the shell type bottom pressure table, the bottom pressure table is lifted, so that the edge of the bottom pressure table comes into contact with the edge of the corresponding pressure table. To block the injection hole. As the viscosity increases during the reaction of the mixture,
The reacting mixture no longer penetrates between the outer edge of the edge of the shell-shaped bottom pressure table and the side mold part after a certain time.

On the other hand, the first reacting mixture diffuses along the outer end surface of the edge of the corresponding pressure table. For this reason, measures are taken in practice such that the outflow is controlled so that the outer end surface of the edge of the corresponding pressure table is covered by a layer of reactive material forming a seal. In this case, the grounding sole and another sole layer can be formed for the first time to integrally form the sole on the shoe shaft.

Furthermore, a shell-type bottom pressure table can be used even if the grounded sole and, if desired, another sole layer are made of a thermoplastic material.

When a shoe sole made of a mixture of reacting polyurethane to form a ground sole and a shaft sole or an intermediate sole is integrally molded on a shoe shaft, the mold or tool is a bottom pressure table, 2 It has one side mold part and a corresponding pressure table.

According to the same principle, a sole having a ground sole, a shaft sole and an intermediate sole can be integrally molded on the shoe shaft by using another corresponding pressure table.

The mold is correspondingly expensive and the form of control of the mold is correspondingly complicated.

[0051]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a shoe sole with a ground sole, a shaft sole and an intermediate sole without incurring significant additional costs for tools and especially control. So that it can be molded integrally with the shaft,
It is an object of the present invention to provide a method for integrally molding a shoe sole including a grounded sole and an intermediate sole (shaft sole) on a shoe shaft.

[0052]

SUMMARY OF THE INVENTION According to the method of the present invention, said object comprises, in a first method step, two side mold parts, a shell-shaped bottom pressure table and a side mold occupying a closed position. The shoe sole covered with the shoe mold and the insertable mold plate that divides the opening of the side mold part into two mold hollow chambers are used to separate the ground sole and the shaft sole. This has been solved by molding and, after the template has been taken out, in a second method step by molding the intermediate shoe sole simultaneously with the ground shoe sole and the shaft shoe sole.

[0053]

In the process according to the invention, it is important to use a shell-type bottom pressure table, which uses a mixture of isocyanate and polyol which reacts to form polyurethane. It is similarly used when molding the sole layer using a thermoplastic material instead of molding the sole layer.

Unlike the prior art, the template according to the present invention is used in place of the bottom pressure table, excluding the use of the bottom pressure table, and the size of the template is such that the template has a shell-shaped bottom addition. To the contour of the ground sole which is supported on the undercut of the side mold part occupying the closed position and on the edge of the pressure table and which has an intermediate sole in the direction towards the mold chamber for the ground sole to be molded. It has a corresponding three-dimensional contour and is chosen to have a three-dimensional contour corresponding to the contour of the shaft sole with the intermediate sole in the direction towards the mold chamber for the shaft sole to be molded. However, the thickness and other dimensions of the template are in this case chosen so as to obtain a mold chamber having dimensions for the intermediate shoe sole to be molded after the template has been removed.

By virtue of these measures, the three-layer sole is integrated with the shoe shaft by means of a mold for integrally molding the two-layer sole on the shoe shaft without any fundamental modification of the mold and the control form. It can be molded.

[0056]

The problem to be solved by the present invention is as follows.
It is to provide an apparatus for carrying out the method.

[0057]

According to the device of the present invention, there is provided a device (mold, tool) having two side mold parts, a bottom pressure table, and at least one wooden mold.
The device additionally mounts on the edge of a shell-shaped bottom pressure table, which divides the opening of the side mold part occupying the closed position into a mold chamber for the shaft sole and a mold chamber for the ground sole. Solved by having a possible template.

Further in accordance with the invention, the template has an annular edge which is supported on the edge of the bottom pressure table and on the undercuts of the side die sections and is surrounded by this edge. The size of the template area matches the size of the mid sole.

In principle, the template corresponds to the corresponding pressure table, in which case the corresponding pressure plate left after leaving the pressure table is on the side of the pressure table, for example by material processing, A three-dimensional contour is obtained which corresponds to the contour of the common contact surface between the shaft sole and the intermediate sole.

In order to save such considerable labor costs, in an advantageous embodiment of the invention, the template is made of a material which is deformable by means of a tool in order to predefine the dimensions of the mold chamber for the intermediate shoe sole. It has a layer with a suitable surface contour.

By virtue of such measures, the template can be deformed by the tool (mold) on the side of the template facing towards the shaft sole, so that the template has the abovementioned dimensions in the direction towards the shaft sole. Is supplemented by various materials.

The present invention further relates to a method for producing a template, in which the template material is produced in the first working step, and then the contour for limiting the mold chamber for the ground shoe sole is subjected to finishing and precision machining. The tool is then used to apply to the material a layer having a contour that defines the mold chamber for the shaft sole.

[0063]

1 is a perspective view showing a shell-shaped bottom pressure table 1 and a template 2.

The shell-shaped bottom pressure platform 1 has a surface surrounded by an edge 3, the three-dimensional contour of which corresponds to the ground plane of the ground sole to be molded.

The edge 3 projects upwards and has a bearing surface 5, which corresponds to a self-closing edge that extends three-dimensionally.

On this edge, the annular edge 6 of the mating template 2 for forming the grounded sole is supported. That is, the supporting surface 7 of the edge portion 6 is supported by the supporting surface 5 having the same shape.

The area of the template surrounded by the edge 6 has a contour which extends three-dimensionally in the direction towards the ground sole to be molded, which contour is the intermediate sole to be molded and the ground sole to be molded. Match the contours of the common contact surfaces of.

When molding the ground sole and the shaft sole, the annular edge 6 is supported by the support surface 8 on the undercut of the side mold part occupying the closed position (see FIG. 3).

Said closed edge 6 of the template encloses a three-dimensional area 9 of the template, the dimensions of which correspond to the dimensions of the intermediate plate to be molded.

FIG. 2 is a side view of FIG. 1, and the same components are designated by the same reference numerals. In this case, the pressure table of the shell-shaped bottom pressure table 1 is designated by 10.

FIG. 3 schematically shows the molding form of the ground and shaft soles, the plane of the drawing being shown in the plane of contact between the side mold parts occupying the closed position. Of these side mold parts, only the side mold part located at the back of the drawing plane is shown by reference numeral 11.

The template 2 is supported by the edge 6 on the one hand on the undercut 12 of the side mold part and on the other hand on the edge 3 of the shell-shaped bottom pressure table 1.

In this case, the injection holes 13 and 14 are opened,
The injection holes 13 and 14 are opened in the mold chamber 15 for the ground shoe sole or the mold chamber 16 for the shaft shoe sole.

The mold chamber for the shaft shoe sole is sealed by the shoe shaft covered with the wooden mold 17 in the range of the undercut portion.

As is apparent from FIG. 3, the template 2 is formed from a plate which has a suitable contour in the area of the edge 6 in the direction towards the mold chamber 15 for the ground shoe sole and the shaft shoe. In the direction towards the mold chamber 16 for the sole, there is a material build-up part 19 made of a material for the grounded shoe sole, which material build-up part 19 forms the area of the template 2 which is surrounded by the edge 6. It is shaped to have the dimensions of the midsole that should be.

After molding the grounded sole and at the same time after molding the shaft sole that is integrally molded to the shoe shaft,
Since the template 2 is taken out by hand or using a gripper,
The filling hole 20 for the material of the middle shoe sole is opened (according to FIG. 4) (shell-shaped bottom pressure table position in FIG. 4), in which case an enlarged mold chamber is formed.

After injection of the material for the intermediate shoe sole, the shell-shaped bottom pressure table 1 is moved upward until it comes into contact with the undercut portion 12 of the side mold portion, so that the mold chamber 21 has a volume of the intermediate plate. And the injection hole 20 is blocked. After the sole material has reacted, the shoe is unmolded in a manner known per se.

[Brief description of drawings]

FIG. 1 is a perspective view of a bottom pressure table and a template.

FIG. 2 is a side view of the bottom pressure table and the template of FIG.

FIG. 3 is a view showing a molding form of a ground sole and a shaft sole of a shoe shaft, the drawing plane being shown in a plane of contact between the side mold parts occupying the closed position.

FIG. 4 is a view corresponding to FIG. 3, showing a molding method of an intermediate plate.

[Explanation of symbols]

 1 shell type bottom pressure table 2 mold plate 3,6 edge 4 surface 5,7,8 support surface 9 range 10 pressure table 11 side mold part 12 undercut part 13,14,20 injection hole 15,16, 19,21 type chamber 17 wooden type 18 shoe shaft

Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display area // B29L 31:50 4F

Claims (5)

[Claims] 1. A method for integrally molding a sole with a shoe shaft, the method comprising: a sole having a ground sole, a shaft sole, and an intermediate sole connecting the ground sole and the shaft sole. Two side mold parts, a shell-shaped bottom pressure table, a shoe shaft-covered wooden mold mounted on the side mold part occupying the closed position, and two side mold part openings. A grounding shoe sole and a shaft shoe sole are formed using an insertable mold plate that divides into a mold cavity, and after taking out the mold plate, an intermediate shoe sole and a grounding shoe are simultaneously obtained in a second method step. A method for integrally molding a shoe sole on a shoe shaft, characterized by molding while integrally molding a sole and a shaft sole. 2. A device having two side mold parts, a bottom pressure table and at least one wooden mold, the opening of the side mold part (11), wherein the device additionally occupies a closed position. Is divided into a mold chamber (16) for the shaft shoe sole and a mold chamber (15) for the grounded shoe sole, which can be mounted on the edge (3) of the shell-shaped bottom pressure table (1) ( Device for carrying out the method according to claim 1, characterized in that it comprises 2). 3. The template (2) has an annular edge (6) which is supported on the edge of the bottom pressure table and on the undercut of the side mold part (11). 3. A template for a device according to claim 2, characterized in that the dimensions of the template area (9) surrounded by the parts match the dimensions of the midsole. 4. The template has a layer of suitable surface contour made of a material deformable by a tool for predefining the dimensions of the molding chamber for the midsole. The template according to claim 3. 5. A template material is produced in the first work step,
5. Finishing and precision machining of the contour for limiting the mold chamber for the ground sole, and then applying a layer with a tool to the material having a contour for limiting the mold chamber for the shaft sole. The template described is manufactured.