EP0075635A1 - Method for the preparation of soles, and sole obtained by this method - Google Patents

Abstract

Method for the preparation of soles and, in particular, of first soles for sandles which consists in cutting out the sole (6) in a suitable material using a cutting-out tool (10) having the shape of the outer contour of the sole on a high-precision press, characterised in that, simultaneously, work is performed on the surface of the sole using presser members (12 - 16 - 19) integral with the tool which shape the material used. Tool for implementing the above method consisting of a blade (10) having the shape of the outer contour of the sole to be produced, characterised in that it is provided, inside the blade, with presser members (12 - 16 - 19) whose active face, on the cutting side of the tool, is located at a distance from the cutting edge which is smaller than the depth of penetration of the latter. The invention is used in the footwear industry. <IMAGE>

Description

The invention relates to a method for the preparation of soles and in particular of sole soles for sandals, which consists in cutting the sole from a suitable material using a cutting tool having the shape of the outer contour of the sole on a high press. precision.

It is known that this process is commonly used for the preparation of soles. In general, two tools are mounted head to tail to cut a pair of soles so as to save the material constituting the soles, which runs in a continuous strip under the tools. These are mounted on a tool holder which can be a wooden tray and presses are used with such precision that the cutting block is no longer a flexible material which lets the blade penetrate, but a steel tray soaked. Despite this constitution of the block, the tools deteriorate less quickly than on the old presses which used a block of flexible material, this thanks to the possibility that we now have to adjust to the hundredth of a millimeter the descent of the tool holder plate.

We also know that after this cutting operation, it is necessary to practice on the sole a whole series of manual, semi-manual or automatic operations which are particularly expensive, because they represent a considerable working time, and which can only give results. mediocre and imprecise. For example, you must first draw a line to indicate the location where the ends of the straps of the sandals will be housed. It is also necessary to provide in the thickness of the sole of the housings for the embedding of these ends of flanges, failing which one would end up with an unsightly overthickness and at the limit painful for the user. These housings, even produced with the intervention of a machine using rotary milling cutters, cannot have a clean edge because the milling cutter works by rotation.

Finally, it may be necessary to wear a certain number of marks and marks on the sole, if only to indicate the size of the shoe.

The object of the invention is to completely remove, after cutting the sole, all manual, semi-manual or automatic interventions and to make available to users, even during the cutting operation, a sole ready to be mounted, of which all the housings, marks and other marks are produced with superior precision, without rounding and without burrs.

To do this, the method according to the invention is characterized in that, at the same time that the sole is cut, its surface is worked using pressing members integral with the tool, which shape the material used.

The invention also relates to a tool for the implementation of this method, consisting of a blade having the shape of the outer contour of the sole to be produced, tool, which is characterized in that it is provided inside of the blade of pressing members whose active face, cutting edge of the tool, is located at a distance from the cutting edge smaller than the penetration depth of the latter.

It is understood that thanks to this process and this tool, it is possible to shape the material of the sole, whether it be leather or a synthetic material among those now commonly used in the manufacturing industry. shoe with remarkable precision since the pressing members are integral with the tool which traces the outline of the sole and whose stroke is known with extreme rigor.

In addition, the housing and other markers or brands are in all dimensions, perfectly defined and perfectly constant. Their size, their depth, their projection, their shape can be determined with the greatest rigor and are found identically on the whole series of soles cut afterwards by the press.

In / end, thanks to the invention, any burrs, rounded or other imperfections inevitably resulting from manual or semi-automatic operations are eliminated.

According to a first embodiment of the invention, the pressing members form a common part with the blade. This embodiment proves to be advantageous, for example, in making a rounding on the edge of the underside of the sole which will facilitate its positioning.
In such a case, the pressing members may consist of an extra thickness of the blade ending in a hollow round in the vicinity of the cutting edge.

According to another embodiment of the invention, the gold pressure ganes are studs mounted on the blade thanks to securing means allowing height adjustment and interchangeability.
This embodiment proves to be particularly advantageous for forming the housings in which the ends of the flanges will be fixed later. Such studs form by compression housings with perfectly sharp edges, without rounding, of any desired size, positioned extremely precisely and always of desired depth, since they can be adjusted in height.

According to a perfectbnnement, the active faces of the studs receive markings in relief drawn in negative. These signs will be printed in positive in the bottom of the dwellings. They can simply indicate the number of the flange to be fixed in a given housing and thus greatly facilitate the work of the worker who assembles the flanges.

According to yet another embodiment of the invention, the pressing members are studs connected to the blade by a trigger guard, which can be constituted by the tool holder, studs whose active face receives identification signs in relief, drawn in positive. Such studs allow imprinting under the sole of the identification signs which, by deformation of the material, will appear on the sole in positive and which can indicate for example the size of the future shoe.

• - la figure 1 est une vue schématique à petite échelle d'un porte-outil sur lequel sont montés deux outils conformes à l'invention,
• - la figure 2 est une vue en coupe selon la ligne II - II de la figure 1,
• - la figure 3 représente à plus grande échelle une semelle réalisée grâce à l'un des outils selon les figures 1 et 2, vue de dessous.
• - la figure 4 représente la même semelle, vue de dessus.
• - la figure 5 est une vue en coupe à échelle encore agrandie selon la ligne V-V de la figure 3,
• - la figure 6 est une vue de dessus de l'outil qui a servi à réaliser la semelle selon les figures 4 et 5,
• - la figure 7 est une vue de dessous du même outil,
• - la figure 8 est une coupe à échelle agrandie selon la ligne VIII - VIII de la figure 6 et
• - la figure 9 est une coupe semblable selon la ligne IX - IX'de la figure 6.

An embodiment of the invention will now be described by way of non-limiting example, with reference to the accompanying drawings in which:

• FIG. 1 is a diagrammatic view on a small scale of a tool holder on which two tools according to the invention are mounted,
• FIG. 2 is a sectional view along line II - II of FIG. 1,
• - Figure 3 shows on a larger scale a sole made with one of the tools according to Figures 1 and 2, seen from below.
• - Figure 4 shows the same sole, seen from above.
• FIG. 5 is a sectional view on a scale further enlarged along the line VV of FIG. 3,
• - Figure 6 is a top view of the tool that served to make the sole according to FIGS. 4 and 5,
• FIG. 7 is a bottom view of the same tool,
• FIG. 8 is a section on an enlarged scale along line VIII - VIII of FIG. 6 and
• - Figure 9 is a similar section along line IX - IX 'of Figure 6.

We see in Figure 1, a tool holder 1 consisting of a rectangular plate, in which are embedded two tools 2 and 3, corresponding to a pair of flanges, tools mounted head to tail, conventionally, to save as much as possible strip material used.

We see from Figure l, the four studs 16, connected directly to the blade and the stud 19 mounted on a trigger guard, all as will be described in more detail below. Usually, a layer of foam covers the tool holder 1, both outside 4 and inside 5 of the tools. This layer of foam ensures after cutting the ejection of the two soles and the separation of the tools with respect to the strip of material which runs on the press.

We know that in fact such tool holders are mounted on conventional high precision presses which drive them with an alternating movement, most generally vertical, facing a steel block. A strip of material which is nowadays most often synthetic, but which can also be leather, runs between the block and the tool holder. Each time the tool holder is lowered, a pair of soles of a given size and shape is cut and ejected.

As can now be seen with reference to FIGS. 3, 4 and 5, a sole 6 produced on such a press, comprises, in the example shown, four cutouts 7 for the passage of the flanges.

Facing each of the cutouts 7, the sole has a housing 8 of determined depth, of rectangular shape and with sharp edges.

On the bottom of two of these housings, the marking 1 has been engraved which signifies that they will receive the ends of the first flange.

On the bottom of the two other changes, the marking 2 is engraved which signifies that they will receive the second strap.

At the heel, size 38 appears in negative and hollow on the underside and in positive and in relief on the upper face.

Finally, around the entire circumference of the underside of the sole, a rounding 9 has been made.

Until now, such a sole was manufactured by cutting, then by a whole series of operations intended to constitute the housings using for example strawberries and to reveal in one way or another the signs of marking for the housings and the identification signs, such as the size, for the sole.
According to the invention, the tool shown in FIGS. 6 to 9 is used to obtain the finished sole in a single operation.

The tool firstly comprises a blade 10 which has the general shape necessary to obtain the sole 6 with its four cutouts 7. Unlike conventional blades and as can be seen very clearly in FIGS. 8 and 9, the blade 10, above its edge 11, forms a rounded 12 so that beyond, it is of a thickness much greater than the blades class ^q ues.

At each of the reentrant parts 1 3 which form the cutouts 7, the blade receives two vertical eyelets 14 serving for the passage of two screws 15 whose height position can therefore be adjusted, screws which in turn ensure the fixing of a pad 16 of rectangular shape.

The underside of the four studs in turn receives raised location signs drawn in negative, which - in this case, are the numbers 1 and 2.

Finally, at the rear of the tool, at the heel, the two branches of the blade are connected by a bridge 18 which can be welded and under which is also mounted by welding a stud 19 whose active face 20 receives a identification sign constituted here by the size 38 and which is in relief and drawn in positive.

It is understood that during the cutting operation and simultaneously with the cutting, the rounding 12 located under the excess thickness of the blade will constitute all around the sole the rounding 9 clearly visible in Figure 5. The four studs 1 6 whose height could be adjusted extremely precisely, will practice in the material of the sole the four housings 1 3. They will also engrave at the bottom of these housings the numbers 1 and 2 which will be legible in positive on the lower part of the sole, since they are drawn in negative under the studs.

Finally, the stud 1 9, on which the number 38 is in more pronounced relief, will engrave this number in negative on the lower face of the sole sufficiently deep so that it appears in positive on the upper face. Thus we obtain the sole 6 completely finished in a single operation as fast as the conventional operation limited to cutting. In addition, this finished sole 6 is provided with housings, markers and identification signs in a perfectly precise and repetitive manner, without burrs and without harmful rounding.

Claims (7)

1. Process for the preparation of soles and in particular of raw soles for sandals which consists in cutting the sole (6) from a suitable material using a cutting tool (10) having the shape of the outer contour of the sole on a press high precision, characterized in that, simultaneously, the surface of the sole is worked by pressing members (12 - 1 6 - 19) integral with the tool which shape the material used. 2. Tool for implementing the method according to claim 1, consisting of a blade (10) having the shape of the outer contour of the sole to be produced, characterized in that it is provided inside the blade d pressure members (12 - 16 - 19) whose active face, cutting edge of the tool, is located at a distance from the cutting edge smaller than the penetration depth of the latter. 3. Tool according to claim 2, characterized in that the pressing members (12) form a common part with the blade (10). 4. Tool according to claim 3, characterized in that the pressing members are constituted by an extra thickness of the blade ending in a hollowed-out round (12) in the vicinity of the cutting edge. 5. Tool according to claim 2, characterized in that the pressing members are studs (16) mounted on the blade (1 0) by means (15) of attachment allowing the height adjustment and interchangeability. 6. Tool according to claim 5, characterized in that the active faces of the studs receive locating signs (17) in relief drawn in negative. 7. Tool according to claim 2, characterized in that the pressing members are studs (19) connected to the blade by a bridge (18) which may be constituted by the tool holder, studs whose active face (20) receives raised identification signs, drawn in positive.

Images