FR2655245A1 - Method for manufacturing an article of footwear, of the mule or sandal type, as well as article of footwear obtained by implementing this method - Google Patents

Abstract

a) Method for manufacturing an article of footwear, particularly a mule or sandal, from a mounting (assembly) insole obtained by associating a relatively rigid sock and a flexible sock lining, the dimensions of which are slightly greater than those of the sock, from an upper and from a bottom stock, b) method characterised in that: - the sock (1) is positioned, particularly by bonding, on the central part of the sock lining (20), - the lower ends (7) of the upper (6) which are intended to be contiguous with the bottom stock (11) are fastened on the corresponding lateral edges (23) of the face of the sock lining (20) not bearing the sock (1), - the lateral edges (23) thus equipped of the sock lining (20) are folded down against the sock (1), the contour of the latter acting as a guide during this operation, - and the upper/insole assembly (14) is fastened on a bottom stock S (11).

Description

 present application relates to a method of manufacturing an article of footwear, in particular a mule or a sandal, from a first assembly obtained by the association of a relatively rigid first interior, and of a first of flexible cleanliness whose dimensions are greater than those of the first interior, a tize and a sole.

Footwear of this type is traditionally mounted on a wooden, plastic or metal form, representing the volume of the
Foot.

This traditional manufacturing method involves the implementation of a relatively long series of operations, given that, in the case of so-called "welded" manufacturing, it is necessary, after having had to make the first assembly by gluing and coating the first interior on the first of cleanliness, to fix said first on the form, by means notably of seeds or staples, before positioning the rod and of mounting it manually or with the machine. It is then necessary to remove the fasteners from the first mounting to the form before fixing the sole
Regarding the so-called "injected" manufacturing, it is normally necessary to assemble the rod on a rigid First by a seam of the "Strobel" type and to cap the whole on a metallic shape exactly adapted to the injection mold of the sole.
Cleared having injected the sole and unmolded the shoe, it is necessary to trim the surplus materials and to pose. after gluing, cleanliness sconces.

 In all cases, these operations are both long and costly, and which also have the disadvantage of requiring fairly specialized work.

 These conventional processes, if they can be supported for heavy manufacturing, are particularly expensive for the manufacture of simplified articles such as mules or sandals, of which they increase the prices appreciably, penalizing manufacturing and limiting sales.

However, no process has hitherto been proposed for the simplified manufacture of footwear such as mules or sandals
A present invention aims to fill this gap by a process for manufacturing footwear such as mules or sandals of high quality, quickly and inexpensively, without having to use a skilled workforce.

According to the invention, this new process is characterized in that - the first is positioned, in particular by gluing
interior on the central part of the first
cleanliness - we fix the lower ends of the rod
designed to be contiguous to the sole assembly at the edges
corresponding sides of the face of the first
cleanliness not wearing the first interior, - fold the side edges thus equipped with the
first cleanliness against. the first interior,
the periphery of the latter serving as
guide member during this operation, - finally fixing the sole assembly to the assembly thus consti
kill
This process has, above all, the advantage of making it possible to reduce, to a large extent, all investments; as regards the so-called "welded" assembly, its implementation requires neither shapes nor staples, and as regards the so-called "injected" assembly it allows the use of simple molds with soles instead of traditional injection molds shape + sole
Experience has shown, moreover, that it allows, for the "welded" assembly, a time saving of approximately 3Njo compared to the traditional process, while leading to an article of a much higher quality because assembled with greater precision.

The attachment of the rod to the first cleanliness can, of course, be carried out by any means without thereby departing from the scope of the invention; in most cases, a simple puncture operation is used, but HP welding or bonding can also be used
As already indicated, the invention applies more particularly to footwear whose upper is reduced to a slap or is integral with the sole assembly at this level. The duality of the footwear article finally obtained is essentially dependent on the precision with which the operation of fixing the upper on the first sock is carried out.

To facilitate this operation, and according to a preferred characteristic of the invention, a first cleanliness is used comprising two projecting flanges situated, on either side, at its periphery to allow the fixing of the flap or of the rod to this level
To be able to assemble the article under satisfactory conditions, it is necessary, according to another characteristic of the invention, to glue the periphery of the first interior as well as the contiguous lateral edges of the first of cleanliness before folding them down.

 This process eliminates the operation of gluing the rod aui had to be performed during the implementation of the traditional method.

 According to another particularly advantageous characteristic of the invention, and with regard to the welded mounting ", a cut sheet of hot-melt adhesive is positioned on the sole to be welded and the rod is welded after re-humor.

 This characteristic has the advantage of being extremely fast, of avoiding any gluing operation and of eliminating any cleaning caused by an excess of glue on one or the other part to be welded.

The invention also relates to an article of footwear, in particular a mule or sandal, obtained by implementing the above-mentioned method
the characteristics of the process as well as of the footwear which are the subject of the invention will be described in more detail with reference to the accompanying drawings, in which
FIGS. 1 to 14, 15 to 22 are diagrams representing the implementation of the traditional methods of manufacturing footwear,
- figs. 23 to 27, 28 to 36 represent the implementation of the process according to the invention
In accordance with FIGS. 1 and 2, the first step of the traditional method consists in positioning, by gluing, a relatively rigid first interior 1 on a flexible first cleanliness 2 whose dimensions are slightly greater.
The first interior can be of any material, for example, synderme, cardboard, agglomerated textile, cardboard, etc.,
Once the first interior 1 has been positioned, the peripheral parts of the first two are glued, as shown schematically in hatched, and the edges 3 of the first cleanliness 2 are folded against the first mounting 5 along line 4 shown in dotted, and shown schematically by the arrows A
A first assembly 5 is thus obtained, the non-folded face of which is shown in FIG. 3 '
According to Figure 4, we glue the periphery of this face of the first mounting 5, as shown in hatched.

 According to Figure 5, glue ézal = - ~ <t the lower ends 7 of a rod 6 destuned to be in contact with the sole assembly of the finished ltartffleS in the particular case of a mule or urea sandal, these ends 7 correspond to the lower part of the slap.

 According to FIG. &, The first mounting 5 is then fixed on a form 8 corresponding to the foot of the user by means of seeds (nails) or staples 9, by its non-glued face.

According to FIG. 7, the rod 6 is then positioned on the form 8. By folding the glued ends 7 against the corresponding glued part of the first assembly 5, the actual assembly of the rod 6 is carried out on the first 5, this operation, according to FIG. 8, being able to be carried out by hand or by hand. machine
According to Figure 9, we then remove the seeds or staples 9 with a tool 10, then, as shown schematically in Figure 10, we glue the underside of the first mounting 5 and the rod 6, as well as the upper face 12 of a sole assembly 11 (FIG. 11) before positioning these two elements relative to each other and assembling them in particular by welding as shown in FIG. 12,
I1 no longer remains to remove form 8, as shown in FIG. 13, to obtain the finished footwear 13 shown in FIG. 14
According to FIGS. 15 to 22 of the traditional so-called "injected" method, the assembly process is described with reference to the appended drawings, representing the implementation of the methods commonly used in the manufacture of footwear.
According to Figure 17 the rod 27 is stitched on a first this assembly 26 by means of a seam of type "Ströbe
According to me 18, the rod 27 and the first mounting 26 forming an assembly are positioned on a metallic form 28, then locked in the position provided by means of a protrusion from the first mounting 26, attached to a device. 28 b located at the back of the metallic form 28
According to FIG. 19 w the form 28 supporting the assembly is lowered into the hollow part of the injection mold 29, according to desired settings of sole thicknesses, necessary centering, etc. then the sole 30 is injected by any which injection machine.

According to FIG. 20, the sole 30 and the adjoining assembly are removed from the mold, left at the instants so that the injected material can cool slightly, then positioned on storage benches for their finishing
According to Figure 21; surplus materials 31 (overshoots during first assembly, injection burrs, etc.) must be trimmed very precisely with a tool 32
According to FIG. 22, the traces of deburring thus produced are then hidden by cleanliness appliques (toe and heel piece) previously coated with glue and positioned at the front and at the rear of the footwear.
According to FIGS. 23 and 24, in accordance with the invention, and as in the traditional method, the first step is by bonding a first relatively rigid upper I on a clean first 20 of a flexible material of slightly larger dimensions.

 According to Figure 24, the first cleanliness 20 comprises, at the level of the slap, two protruding flange 21 & 21 'located on either side at its periphery.

 This association makes it possible to obtain the assembly 5, called the first assembly.

 According to FIG. 25, the lower ends 7 of the rod 6 are fixed, in particular by stitching, on the projecting edges 21 & 21 ′ of the first cleanliness 20, as shown by the lines in broad dotted lines 22, then, according to the FIG. 26, the side edges 23 are cut down in their entirety on the first interior 1, the outline of the latter acting as a guide during this operation.

According to FIG. 27, it then suffices to position, on the sole intended for another welded, a cut sheet of hot-melt glue, to put this glue back in the mood using an infrared lamp or any other heat source, and display the assembly 14 of FIG. 26 on the sole assembly 11, then weld the assembly, so as to obtain the footwear 13 shown in FIG. 14
According to the invention, the process is identical for the case of the so-called "injected" assembly. Figures 28, 29, 30, 31 correspond to Figures 23, 24, 25 26 of the description of the invention, but, for an injected sole assembly. , the sequence of operations is different after making the set 31
Indeed, according to Figure 34, we position,
inside the assembly represented in 3 o, a metal plate 35 very exactly adapted to the sole mold 36
According to FIG. 35, the sole is injected, with any type of machine for injecting, or for molding the soles.

According to FIG. 36, the shoe is then removed from the mold, and requires no finishing, no deburring, no positioning of cleanliness appliques, since the first cleanliness is actually the first of assembly 5
I1 it should be noted that, to avoid repatriation
of the material injected during the pro --- ent injection
said, the metal plate 35 has notches
35 a and 35 b to exactly match the contour of the rod 6, in particular at the location of the extra thicknesses this characteristic being inherent in the invention

Claims (5)

REVEN1) ICATI0NS 10 - Method of manufacturing an article of footwear, in particular mule or sandal, from a first assembly obtained by the association of a relatively rigid first interior and a first of flexible cleanliness whose dimensions are slightly higher than those of the first interior, of a rod and a sole assembly, process characterized in that - the first interior (1) is positioned, in particular by gluing, at the central part of the first cleanliness (20 ) - the lower ends (7) of the rod (6-) are fixed) intended for other continuous sowing (12) on the edges = a- 7aus (23) corresponding to the face of the prem- - = of cleanliness ( 20) not carrying the first interior (1) - the lateral edges (23) thus ejected from the first cleanliness are folded over the first interior (1), the periphery of the latter acting as a guide member during this operation , and, - the sole assembly (11) is fixed to the first mounting (5)  20 - Method according to claim 1, characterized in that one pricks the lower ends (7) of the rod (6) on the lateral flanges (23) of the first cleanliness (20)  30 - Method according to any one of claims 1 and 2, characterized in that one uses a first cleanliness (20) having two projecting flanges (21 & 21 ') located, on either side, to its periphery to allow the attachment of the flap or the rod (6) at this level  40 - Method according to any one of claims 1 to 3, characterized in that one sticks by any manual or mechanical means, the periphery of the first interior (1) and the contiguous lateral edges of the first cleanliness (20 ) in order to fold them down, whether the operation is done together or separately  50 - Method according to any one of claims 1 to 4, characterized in that the folding down of the lateral edges (23) of the first mounting (5), constituted by the first interior assembly (1) increased by the first of cleanliness (20) and the rod (6), can be carried out by any means, manual or mechanical  60- Method according to any one of claims 1 to 5, characterized in that, after having folded down the first cleanliness (20), positioning a sheet of hot melt adhesive (24) on the soleplate, and that the the assembly (14) is welded to said sole assembly (11)  70 - Chaussart article. in particular mule or sardale, characterized in that it is obtained by the implementation of the method according to any one of claims 1 to 6