DE1510002A1 - Method and device for gluing together a shoe upper from its components - Google Patents

Description

Pats nla n world

Karl A-Brose

Mflmhaii-PuHach 1510002

2.-T.I.Müt> ch »n 790570

B / kü Münohen-Pullach, the 2 4 ο-63Ct whether he

-SOTISOTEEL INYBSTMENTS LIMITED, Morley Road, Bristol, Gloucesters hire, England

Text drive and device for gluing together a shoe upper from its components

The invention “relates to a method and a device for joining the components of shoe uppers _{0 together}

With the usual manufacturing processes for sole uppers this is Putter, which can be made of fabric or leather, is attached to the material forming the upper leather with the help of an adhesive it is also possible to coat the lining with an adhesive, which softens when exposed to heat. In this case the lining is then ironed onto the material making up the upper leather. This iron-on or hot-pressing is the first Machining process represents. A toe cap is after the previous Method also glued on in a further process Then the upper edge of the upper in the finished shoe wixd, edged by gluing a band of fabric or the material of the shaft is turned inwards at the upper edge · The edge of the glued-on tape or the folded fold is then with Covered with the help of a piece of tacked or sewn material * lies thus takes place in a third work step.

The purpose of the present invention is to provide a method of the initially to create the type mentioned, in which the number of individual work processes is reduced and cheaper than the previous one Procedure is to be carried out.

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The inventive method allows the use of unskilled Assistants in simplifying the work and in reducing it the number of devices required, in the usual manual work arises despite the attachment of practiced and trained Workers always run the risk of rejects due to processing errors. By reducing through human Failure due to influence, it is possible with the invention to significantly reduce or reduce the incidence of rejects ™ can be ruled out entirely. This also simplifies the control of the finished product. Overall, therefore, a considerable saving is achieved when using the method according to the invention Cost, time, space and equipment achieved while obtaining a simultaneously improved end product.

The device further proposed by the invention is made possible it is to use semi-skilled workers for a manufacturing process that previously required skilled workers.

In the previous process, both the usual side seams as well as the seams when joining different colored leather types to create a certain look on the shoe can be sewn by machine. This was a time-consuming process that could only be carried out by trained specialists and with the help of expensive machines could be carried out * According to the invention, such Connections made by semi-skilled workers and without special devices. Neither will there be any additional time except for those that are used to join the upper part of the shoe anyway is required, consumed. The assembly is made even more economical and convenient by attaching centering pins designed.

The seams produced by the method according to the invention are cleaner than those made by sewing, they are beyond

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watertight and stronger because the material is not punctured by needles weakened and no thread is used in the ear smoke loses its strength.

The method according to the invention for gluing together a shoe upper from its components consists, according to the invention, in that, at the same time as the components are pressed together, an adhesive is activated with the aid of electromagnetic vibrations. The vibrations can be high-frequency oscillations that cause a dielectric heating effect. In this case, the arrangement is brought into a high frequency field, so that heat is generated in the arrangement itself through dielectric losses. However, it is also possible to activate the adhesive by microwave heating using electromagnetic oscillations with a frequency in the range of about 5000 to 30000 MHz. Due to the better use of energy in these sequences, smaller generators can be used to achieve the same effect in this way the installation costs can be reduced compared to high-frequency heating ₀

At least the greater part of the pressure to be exerted can be used as a separate processing stage immediately after activation of the adhesive are applied. The pressure can be created with the help of cooled elements «

The use of assembly aids or holders is common in many Industries common but never considered in the shoe industry. This is due to the fact that the one another The components to be united have irregular shapes and are relatively thin and flexible »The ones to be joined However, parts can according to another proposal of the invention temporarily held together in a holder (jig) and with help a conveyor are brought to a heater, whereafter

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the components are then subjected to the action of pressure. Of the Conveyor can consist of an endless belt of fiberglass cloth that is labeled with P.T.F.E. is impregnated "

The parts to be joined may be temporarily fixed to each other wej with the aid of pressure-responsive adhesive at spaced apart locations? _E It is also possible to versohweissen the materials locally punctiform each other _o

The heating device can consist of one serving as a waveguide Box exist, the electromagnetic oscillations in the range of about 3000 to 30 »000 19Hz are supplied and in the box form a standing wave, with the box facing each other Has side openings through which the conveyor ' tape goes through.

When carrying out the method according to the invention, a separate bracing can be used with the rest of the arrangement is united between the flat plates of a press. It is also possible to use a one-piece bracing part of the to use the usual form, as described below becomes β

In both cases, the ingredients can be used in an expedient manner holes must be provided before assembly through which dowel pins will pass when the pressure is applied

Ornaments on the outside of the shaft, such as decorative stitching, Embossings or perforations can also be made on the external material when gluing.

The pressure plates can be equipped with curved surfaces, so that the front part and the side parts of the shaft when

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Glues can be brought into their shape. The outer material may be composed of two or more pieces of mutually different materials, for example, of leather and nylon of mög-.licherweise contrasting colors "Even such parts united miteiander can weafen when gluing _o

The invention is explained in more detail below with reference to the drawing It shows:

Figo 1 is a diagrammatic perspective view of a "

Press with flat plates when joining the

Shoe upper parts,

Fig. 2. A plan view of a shoe upper after Adhere,

3 shows a view of the inside of the shoe sole Figure 3,

4 shows a diagrammatic representation of a microwave heating device and

Figo 5 is a perspective view of the device according to Figure 4 *

Like FIGS. 1 to 3 of the drawing using an exemplary embodiment show the invention, a separate bracing is used, so that the assembly can be assembled in a conventional press equipped with flat plates 10 and 11 · The upper one flat plate 11 is covered with a relatively thick rubber coating 12 or a covering made of other suitable material. the Plates 10 and 11 simultaneously represent high-frequency electrodes. On the lower plate 10 are a number of spring-loaded alignment pins 13 arranged, which protrude in the normal position upwards over the surface of the plate, aher pushed back into a position in which their end with the panel surface ■ * lies in one plane · The pins 13 are both in terms of their

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Attachment as well as their number so arranged that those to be joined Parts are secured against unwanted displacement. For this purpose, the parts of the shoe upper to be united are on Provided suitable places with holes 14 through which the pins 13 reach and thereby for a displacement-free fastening on the lower plate 10.

The edge 15 (see Mgur 3) lying at the top of the finished shoe is turned inward on the outer material 16. The material 16 is then placed on the lower plate 10, with no outer side 16a resting on the plate. A toe cap 17 and a further bracing consisting of two halves 18 and 19 are then placed on the piece of material 16. Each of the aforementioned parts is held in the required position by one or two dowel pins. One or both of the abutting surfaces is coated with a suitable adhesive. The chuck 20 is then placed on the assembly produced up to now, with adhesive again being provided. The upper plate 11 of the press is then moved downwards and the assembly is subjected to pressure. It has "been found that a suitable pressure is about 150 pounds per square inch" The assembly is then exposed to the action of a high frequency field, the strength and duration of the action being tailored to the particular material used of the adhesive are connected to one another, so that the puddles which are coated with adhesive adhere firmly to one another <>

When applying radio frequency energy is essentially generates heat in the components of the arrangement, which have large dielectric losses. Because of this, the adhesive decreases • A high temperature as well as that made of plastic, for example

such as polyvinylchloride existing components ^ while leather does not

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becomes very warm and therefore does not suffer any damage.

The heat comes on to the leather and other materials for carrying out the inventive method for acting, has a favorable effect on the shape retention of the finished shoe of _r because the shoe better maintain its shape and presentable is · B is the fact that all sewing * e and visible hems and connections are very clean.

Plasticized polyvinyl acetate with or without the addition of modifying substances is a suitable adhesive for the process according to the invention know be used without cross-links producing additives and jbhermoplastische substances, such as polyvinyl chlorides _o or elastomers such as polychloroprene ·

The material of the outer surface of the forming shoe upper may be made of different materials from one another-such as from Uylon and leather, consist · i

In another embodiment of the invention, a one-piece stiffener is used. This will result in an uneven shape used, with measures being taken to prevent the lining sticks to the material of the shoe upper, during the Shank is machined in the press · This can either be achieved by the fact that the one "pocket" forms the bracing The surface is not coated with a heat-softening adhesive, or by having the two components kept separate from one another in the area in question, for example with the aid of a sheet of paper

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will. The sheet of paper can be treated in such a way that the Adhesive does not stick to it.

If an uneven press plate is used, this is placed on the lower press plate and then forms the lower high-frequency electrode. The plate is accordingly made of conductive material or provided with a conductive layer at a suitable point. A particularly thick, flexible cushion is placed on the upper pressure plate as a covering. In this cushion, which can be made of foam rubber or rubber-like material, a deformable, electrically conductive layer is embedded relatively close to its bottom surface, which can consist of a thin wire mesh, for example. This conductive layer represents the upper high frequency electrode ₀

The bonded assembly is usually removed from the high frequency press while it is still hot. As a result, the adhesive is still soft and the workpiece is sensitive until it cools down and the adhesive hardens. To avoid the possibility of damaging the just manufactured workpieces, the inventive method can be modified to the extent ₀ The final pressing together is that the high frequency energy is applied to the arrangement for exposure without or while only little pressure is applied by the press danaoh between cooled plates or correspondingly shaped pressure elements carried out, wherein the workpiece left this processing stage has a firm 'adhesive bond, which withstands all mechanical stresses which are exerted on it in the next processing stage.

As shown in Figures 4 and 5, it is also possible to

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In accordance with the procedure described above, a heating device operating with microwaves can be used, in which energy in the form of electromagnetic oscillations with a frequency in the range from about 3000 to 30,000 MHz are passed through a suitably designed waveguide 21 to an elongated box 22, which so is proportioned that a standing wave is formed in it in the longitudinal direction. The box 22 is elongated rectangular and is made of metal. The box lies horizontally with the waveguide 21 attached at one end. Two horizontally lying slots 23 on the two sides 24 represent the passage opening for an endless conveyor belt 25, which can consist of a glass fiber fabric which is impregnated with PeToFoEo. When the workpiece is treated in this device, it is preferably removed from the auxiliary device for assembly. The various components are temporarily attached to one another, for example with the help of adhesive applied in dots or by spot welding. Immediately after the workpiece has passed through the heating device, the individual components are finally connected by the application of pressure, as described above. i

The heating effect is in the area of the nodes of the standing Wave stronger than in the other areas. This effect can be neutralized in that the endless conveyor belt 25 with the workpiece lying on it not at right angles to the longitudinal axis through the heating device but at an angle of about 30 ° up to 45 °, as shown in FIG. 4. The workpiece is heated evenly in this way.

The heating method described last is more effective than heating with lower frequencies. This means that high working speeds can be achieved with lower system costs can.

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Although a press is commonly used to compress the components of the heated assembly, it is also possible to achieve the same effect by using two back rollers 26 and 2? to achieve, of which at least one with a resilient covering
is provided.

All details described and shown are essential to the invention

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Claims (1)

Claims '(I J method for gluing together a shoe upper from its components, characterized in that simultaneously with the Pressing the components together an adhesive is activated with the help of electromagnetic vibrations. | 2. The method according to spoke 1, characterized in that the Adhesive is activated by high frequency heating, 3. Method according to claim 1, characterized in that the Adhesive is activated by microwave heating 4. Method according to the preceding claims, characterized in that the dielectric losses of the adhesive are just as great as those of the workpieces to be glued. 5. The method according to the preceding claims, characterized in that at least a larger part of the pressure is exerted ( as a separate processing step after activating the adhesive » 6. The method according to claim 5, characterized in that the Pressure is applied between cooled pressure elements 7 · The method according to claim 5 * characterized in that the Components temporarily assembled in a holder (jig) and fastened together, then with the help of a conveyor «duroh • ine heating device out and closing xu pressure elements to be brought" · 6 * Yerfehren naoh Anspruoh 7 # daduroh marked, Amnm mis 909824/0164 BAD OFHGlNAL Conveyor a fiberglass belt is used, which is impregnated with P.T.P.E. 9. The method according to claim 7 »characterized in that the Components in distant places ¥ ovtiveraging be connected to one another by a pressure-sensitive adhesive. 10. The method according to claim 7 »characterized in that the Components temporarily through spot welds to one another be attached. 11 · The method according to claim 1 »characterized by the use of a separate bracing, wherein the shank parts be joined together between flat plates. 12. The method according to claim 1, characterized in that a One-piece bracing used and the Sohuhsohaftteile on one Lines are joined together. 13. The method according to the preceding claims, characterized in that the soleplate adhesive parts are provided with holes before being joined, through which dowel pins pass. 14. The method according to the preceding claims, characterized in that when gluing together external decorations are attached to the outer material of the shaft. 15. Device for performing the method according to claims 1 to 14t daduroh characterized in that the · heating device consists of a box designed as a Ifellenleiter, the electromagnetic oscillations of about 3000 to 30,000 MHz are fed to form a standing wave, whereby there are openings in the opposite sides of the box through which the conveyor passes 909824/0164 BAD ORJGfNAl. 16. The device according to claim 15 »characterized in that the conveyor through the box at an angle of about 30 ° 45 ° is guided to the longitudinal axis. 17. Device according to claims 15 and 16, characterized in that that two pressure rollers are provided, at least one of which has a flexible covering. 18 · Device according to claims 15 to 17ι thereby marked f shows that the panels have uneven surfaces that give the front part and the side parts of the shoe shaft their shape to lend. 19. Device according to claims 15 to 18, characterized by that it forms the outer side of the sole Material consists of two or more pieces of different material that are joined together when gluing BADOFHGiNAL
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