MXPA98009402A - Assembly template for assembling shoes, assembled shoe on template and preparation method - Google Patents

Abstract

The present invention relates to an assembly jig for the assembly of shoes, of the type in which an upper part is folded and fixed below said jig, said jig being characterized in that it comprises: a support base that is covered, in the bottom part, with a layer of hot melt adhesive material in an amount of less than 300 g / m2 and preferably of less than 180 g / m2, so that said upper part can adhere to said template by heating, wherein said adhesive It is a powder adhesive included in said base of sopor

Description

ASSEMBLY TEMPLATE TO ASSEMBLE SHOES. ASSEMBLED SHOE ON TEMPLATE AND PREPARATION METHOD DESCRIPTIVE MEMORY The invention relates to an assembly jig for assembling shoes of the type in which an upper part is folded and fixed below the jig. The invention also relates to the shoe assembled on the template. The types of shoe assemblies in which the upper part is folded and fixed below the template are exemplified by, for example, the Good-year types "Blackr San Crispino and Ago. In the types of shoe mentioned above" the upper part is fixed to the template by virtue of the hot melt adhesive material that is inserted at the time of assembly in the region of the lower part of the assembly jig and the top bent, so that it is possible to assemble the upper part of the shoe in one operation Then »according to known methods» the upper part is folded over the lower part of the insole and is supported in order to obtain a flat surface on which the sole finally adheres in order to obtain a finished shoe. On the back »the template generally includes» under a support base »a metal flange and a reinforcing member which is arranged below the metal flange. The flange is generally fixed to the reinforcing member. The foregoing is the main field of the industrial application of the invention but is not a limitation "since the invention can be applied in equivalent fields as expressed in claim 1. Some examples of templates according to the above field of industrial application are disclosed by EP 525 324. US 3906 570 and US 2 259 5B6. Suitable adhesive materials for assembling shoes are disclosed, for example, in GB l 601372 »GB 2 081279» US 4125522 and US 3362036. Assembly methods are described in US 2 259586 »US 3 533117, US 3 483 582, US 3 362 036 and US 3271 799. The aforementioned known systems, however, are not free from drawbacks. First of all »the injection of a hot melt adhesive material during the assembly of the shoe causes localized accumulations of adhesive material which encumbers the shoe. This stiffening has a severe negative effect on both the comfort of the wearer of the shoe and the health of the foot, which is prevented from performing its natural movement. This occurs in any case when a localized accumulation of adhesive material is used, even if the adhesive material is not injected during assembly of the shoe as described in US 3 271 799. Further »from the standpoint of maintenance and productivity of the plant »the known system that uses the injection of the hot melt adhesive material has problems because the adhesive materials tend, over time» to obstruct certain parts of the systems »for example the nozzles. This is generally due to the fact that the high temperature at which the molten thermoplastic adhesive material is maintained prior to injection causes the adhesive material to experience cracking within the machine over time. In practice »deposits are formed that block the ducts and must be eliminated by paralyzing the plant» with obvious costs in terms of loss of both maintenance and productivity. Finally, only certain types of adhesive materials are able to withstand the long-term thermal stress caused by staying for a long time at a high temperature. These adhesive materials tend to be inherently rigid after cooling and thus worsen the aforementioned problems in relation to a high stiffness of the resulting shoe. The object of the present invention is therefore to solve the above drawbacks with an assembly template for assembling shoes, of the type in which an upper and fixed part is folded below the stencil, and further characterized in that the stencil comprises a support base which is covered »on the underside, with a layer of hot melt adhesive material in a amount of less than 300 g / m and preferably less than 180 g / m »» in such a way that said upper part can adhere to said jig by heating. In other words, the template comprises a support base which includes hot melt adhesive material on the underside so that the upper part can adhere to said template by heating. Preferably the template carries an amount of adhesive material of between 50 and 300 g / m58 and preferably between SO and 180 g / m2. Preferably, the adhesive material has a melting point of between 40 and 180 ° C, preferably between 45 and 120 ° C, as measured by the DSC method. with a gradient of 10 ° C / min. Preferably, the adhesive material includes a polymer selected from: polyesters, copolyesters, polyesters, copolyes, polyolefins, polyurethanes, ethylvinyl acetates, asrylic resins, polyvinyl acetates, vinyl polymers. More preferably, the adhesive material is chosen from: polyesters, copolyesters, polyurethanes, ethylvinyl acetate, polyamides and copolyamides. More preferably still, the adhesive material is formed with a mixture of polyurethane and polycaprolactone. Preferably the adhesive material is included in the lower part of the support base by depositing adhesive powder. Furthermore, in the context of extensive industrial production it is feasible to use a film adhesive material on top of the bottom of the support base. The support base can be formed »for example with a canvas impregnated» with a fabric »with a non-woven fabric, with an impregnated non-woven fabric, with an extruded component, with a co-extruded component» with bonded fibers or with recovered leather . In the case of a co-extruded component »the support base can be coextruded together with an adhesive film» in order to automatically assemble the two parts described above. The reinforcement can be formed by agglomerating fibers, for example cellulose fibers impregnated with a latex. The support base may be provided with micro-perforations in order to allow moisture to perspire. The invention further relates to a method for preparing a template as described above, wherein the icroperforation is preferably performed with heated needles. The invention further relates to a shoe that is assembled on an assembly jig as described above, in which the adhesive material disposed between the bottom part of the support base and the top part is preferably present in an amount of less than 30Og / m and more preferably less than 180 g / m2. The present invention will become apparent with reference to the accompanying drawings, in which: FIG. 1 is an exploded bottom view of the insole according to the invention.; Figure 2 is a perspective view of a -second embodiment of the template according to the invention "in which a microperforation is provided; Figure 3 is a bottom perspective view of the template of Figure 1 »to which an upper part has been applied; Figure 4 is a top perspective view of the template of Figure 1; Figure 5 is a side sectional view of a shoe assembled on the template of Figure i; Figure 6 is a side sectional view of a shoe according to the third embodiment of the insole according to the invention; Figure 7 is a bottom perspective view of a finished shoe according to the invention; Figure 8 is an exploded bottom view of the template according to the embodiment shown in Figure 6; and Figure 9 is a top perspective view of the template of Figure B.

Illustrated with reference to FIGS. 1 to 7, a shoe assembly jig 9 'of the type in which an upper part 12 is folded at 13 and fixed below the jig 9. A jig 9 is formed with a support base 10 including a hot melt adhesive material in its lower part; or an enfranque 14 »that has a stiffening function; and with a reinforcement that is available over the enfranque. The reinforcement 15 is fixed on top of the support base in order to form a single body »using for example neoprene adhesive material. The enfranque is fixed, in the preferred metallic mode, to the support base by riveting. The reinforcement 15 covers the back of the support base 10. On the back, it is provided in the support 15 and the support base 10 in size. In other words, in this rear part, a dimension of the support base 10 and a dimension of the reinforcement 15 are identical. With particular reference to the modality of the figure 6 »the assembly jig 9 includes a lower layer 16 which is disposed below and at the rear of the support base 10. The lower layer 16 has a dimension that is substantially less than a dimension of the support base »in order to free a perimeter region 17 of the support base 10. The perimeter region 17 allows the adhesion of the upper part 12 to the support base IO despite the presence of the lower layer 16, which does not have in itself adhesive characteristics. The lower layer 16 is preferably used »if it is necessary to further strengthen the shoe» for example in the case of shoes that require application of a high heel. It has been observed that the invention allows to overcome all the known drawbacks and achieve the following advantages: It is no longer necessary to apply any adhesive material during the assembly of the upper part, considerably simplifying this assembly step, reducing costs and maintenance costs . In particular, the complete absence of any device for transferring a liquid adhesive material at high temperature simplifies the entire assembly operation in a drastically drastic manner. All periods of stoppage that were dedicated to clean the plant »the nozzles, etc. , they are also eliminated more clearly in full. It has also been noted that, despite using a highly automated method, it is possible to create shoes with a flexibility that could only be achieved with old manual assembly methods, but which was not quite within the capabilities of modern, currently active plants. In particular, it is possible to obtain much more flexible shoes with obvious advantages. Surprisingly »it is possible to use the same machines that were used for known methods, without having to make particular modifications. This is a great advantage from the industrial point of view, since the important advantages expressed above can be immediately provided, without having to sustain the high investment costs to modify the machines required to assemble the shoes. The invention is susceptible to numerous modifications, which are within the scope of the same inventive concept.

Claims (16)

NOVELTY OF THE INVENTION CLAIMS

1. - Assembly jig (9) for the assembly of the shoes (11), of the type in which the upper part (12) is folded and fixed below said jig (9), further characterized in that said jig (9) comprises a support base (10) which is covered »at the bottom, with a layer of hot melt adhesive material in an amount of less than 300 g / m and preferably less than 180 g / m53, so that upper part (12) can adhere to said jig (9) by heating.

2. Template according to claim 1, preferably comprising a metal jacket (14) that is fixed on top of said support base (10. Template of compliance with at least one of the preceding claims »comprising the reinforcement (15) that is fixed on top of said support base (10) and on top of said cover (14), said support base (10) being suitable for covering an entire insole of said shoe (11), said reinforcement (15) to cover a back of a template of said shoe (11) 4.- Template according to claim 3, further characterized in that the rear part has a dimension of said support base (10) and a dimension of 5. The reinforcement template (at least one of the preceding claims) comprising a lower layer (16) which is disposed below »and in the rear region» of said support base (10). ) »Yt It has a dimension that is substantially smaller than a dimension of said support base (10) in order to free a perimeter region (17) of said support base »said perimeter region allowing said adhesion of said upper part (12) to said support base (10). 6. Template of compliance with at least one of the preceding claims, further characterized in that said support base (10) is provided with an isroperforation in order to allow adequate transpiration. 7. Template of compliance with at least one of the preceding claims "further characterized in that said adhesive material can be included in said support base (IO) by depositing a powder adhesive material or a film. 8. Template of compliance with at least one of the preceding claims, further characterized in that said adhesive material is present in an amount of between 50 and 300 g / m, preferably between 50 and IBO g / m58. 9. Template of conformity at least one of the preceding claims »further characterized in that said adhesive material has a melting point of between 40 and 180 ° C, preferably between 45 and 120 ° C, measured by the DSC method, with a gradient of 10 ° C / minute. 10. Template according to at least one of the preceding claims, further characterized in that said adhesive material comprises a polymer chosen from: polyesters, copolyesters, polyamides, copolyamides, polyolefins, polyurethanes, ethylvinyl acetates, acrylic resins, polyvinyl acetates. »Vinyl polymers and preferably chosen from: polyesters» copolyesters »polyurethanes» ethylvinyl acetates »polyamides and copolyamides. 11. Template of compliance with at least one of the preceding claims, further characterized in that said adhesive material comprises a mixture of polyurethanes and polycarprolactones. 12.- Template of compliance with at least one of the preceding claims "further characterized in that said template (9) comprises a support base (10) that includes, in the lower part, a hot melt adhesive material» so that said upper part (12) can be added to said jig (9) by heating. 13.-Shoe assembled on an assembly template in accordance with at least one of the present claims. 14. Shoe according to claim 13, further characterized in that said adhesive material disposed between the lower part of said support base (10) and said upper part (12) is present in an amount of less than 300 g / m5 * and preferably of less than BO g / m. 15. Method for preparing a template according to at least one of the present claims further characterized in that said microperforation is preferably carried out with heated needles. 16.- Any new feature with a new combination of features described or illustrated in the ismas.