JPH05229011A - Method and device for covering object with soft film and article thus obtained - Google Patents

Abstract

PURPOSE: To improve a covering method to cover surface of an object with a covering material then to fix the material by shrinking on the surface in order to widely expand its application range. CONSTITUTION: This method consists of the following steps: to cut out a piece 16 of a flexible material in the shape corresponding to the surface to be covered of an object 15 with an additional edge part 16a, to pierce an auxiliary thread which forms a stitch-doubling part for forming a passage on the edge of the edge part 16a, to dispose a combined thread 1 containing an electroconductive thread and a thermoadhesive material 3 covering this in the passage of this stitch-doubling part, to cover the surface of the object 15 by the piece 16 and fold back the edge part 16a of this at the edge part 16a of the object 15, to shrink the edge part 16a folded back by giving a tension between both ends of the combined thread 1 in the passage, to heat it up by energizing the electroconductive thread 2, and to seal the whole circumference of the edge part 16a on a support 15a by welding the thermoadhesive material 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for coating an object such as an accessory of a seat, which constitutes a seat back, a seat or an armrest, with a flexible cover. The invention also extends to the products obtainable by the above method and the apparatus contemplated for use in carrying out the method.

[0002]

Seat accessories generally consist of a suitably shaped rigid support and an elastic layer, in particular a foam, which is retained on the front of the support by a cover. This rigid support is typically made of wood or plastic (or similar material), but can also be made of metal.

Such coverings are nowadays made from textile pieces which are cut out in the shape of an accessory with a very large edge around them. This edge makes it possible to grip the respective covering at its edge, folds around the fitting and provides a pulling force which ensures that the covering is placed around the fitting. And then the edge is fixed to the rigid support on or around its back. In the case of wood supports, this fixing method is usually ensured by the attachment of the fabric to the supports by means of hooks, fasteners or the like. In the case of metal supports, this fixing method is ensured by a liteau attached to the edge of the accessory to pierce the edge of the fabric.

Such coating methods have great drawbacks. First of all, this method requires a great deal of manual work to carry out the manual operation of placing the coating in place by subsequent pulling forces and the operation of fixing the coating by gripping or a collar. In the case of metal supports, such manipulations are not only lengthy, they must be precise and require great skill. In addition, the large width of the edges required around each piece of fabric gives a significant loss of material compared to the exact width required to cover the accessory, and often these edges. The part must be cut large to remove the floating strips of fabric, and such an operation increases the cost of manual work and detracts from the delicate features of the product. There is a risk of kicking.

[0005] Such drawbacks have been solved by the technique described in the applicant's European patent EP 223.312, which covers the surface of the object and which surrounds or is opposite the surface of the object. Comprising forming a covering having a shape having an edge folded back to, and then holding this covering by a pulling thread held by an auxiliary thread sewn along said edge, The pulling thread is adapted to be tensioned and fixed so that the edge portion has a fold and is contracted on the periphery of the object or toward the rear surface.

[0006]

SUMMARY OF THE INVENTION The present invention is an improved method for coating an object that was developed from the techniques described above, which provides similar advantages to the techniques described above and which can broaden the scope of application of such techniques. It is intended to be provided.

[0007]

To achieve the above object, the present invention provides a method for coating an object with a flexible covering, which method comprises: Cut out a piece of flexible material that is correspondingly shaped and shaped to have an edge that is additional to this profile, piercing this edge with an auxiliary thread and cutting the edge of this piece. Forming an interlocking portion including a piercing line in the material and an outer mating line, with a passage extending between the two parts along the edge; In the passage of the combination thread arranged so as to be able to sew a length that extends inside along the passage and beyond both ends of the passage, in which case the combination thread is A temperature lower than the melting temperature of the auxiliary yarn and the soft material. A conductive thread surrounded by a heat-adhesive material that is rendered adhesive by the heat of the composite thread, such that the edge provided with the combination thread extends beyond the contour of the object. The front surface of the object is covered with the piece, the edge portion is folded back at the edge portion of the object, and a pulling force in opposite directions is applied to both ends of the combined yarn so that the combined yarn is restrained in the passage. , The conductive thread is connected to a power source to heat and melt the thermoadhesive material and seal the rim around the perimeter to the support. It is characterized by a combination of steps.

It is noted that according to French Patent No. 1.049.710 it is known to use electrical threads to combine two elements. However, the method described in this patent is far from the technical field of the present invention. Furthermore, this patent contemplates the combination of thermoplastic elements, i.e., according to this method, contrary to the present invention, the yarn ensures that the elements are brazed. It simply constitutes an improper heating element.

The method according to the invention first of all offers the same advantages as the technique described in European patent EP 223.312. Furthermore, according to this method, the edges of the covering are fixed to the support on its entire circumference, and thus are adapted to the shape of the support. The scope of application of such a method is extremely wide.

In practice, first of all, this method advantageously uses a combination of yarns, where the heat-adhesive enclosing material is made of metal, plastic, porous material (paper, carton, leather, wood, etc.). It is made of a synthetic resin or a mixture of synthetic resins having adhesiveness to a large number of such materials, which makes it possible to coat the coating on a great variety of supports having different properties.

Many other embodiments may be contemplated to provide a variety of different coating and assembly possibilities.

Thus, according to a first embodiment, which envisages the coating of an object with a rear surface opposite the front surface,
The combination yarns are arranged so as to face the rear face after the folding of the edges, the rear face constituting a support for sealing the edges of the flexible piece.

According to this embodiment, the profile of the covering is sealed to the rear surface of the object around the entire circumference. in this case,
An advantageous aspect of the invention is that the elastic layer of the seat accessory is coated directly on the elastic layer of the seat accessory which is covered without the need to line the rigid support at its rear surface. It is noted that it can be glued. The only requirement given is that it is necessary to use a thermoadhesive material which has adhesive properties for the elastic layer.

Furthermore, the fact that the covering is sealed to the rear surface of the object all around its circumference allows for the coating of non-planar objects, ie objects having concave and convex front and rear surfaces. Eggplant. Such a coating is practically advantageous in that the pressing force on the periphery of the edge of the piece is maintained during the thermal bonding operation of the edge of the piece to the rear surface of the object.

In addition, the method according to the invention likewise makes it possible to coat objects whose rear surface is non-linear, in particular having a concavely contoured part.

Advantageously, in order to carry out such a coating, a piece having a projection on its edge with respect to the rear surface is arranged at right angles to the curved area of each part of the concave profile. For each of these concave contoured sections, perforating a buttonhole arranged at the edge of the piece to be positioned perpendicular to the passage before making the interlocking part; The edge portion is folded back at the edge portion of the article, and one piece body is built in each button hole so that the combined yarn is supported inside the piece body.

Furthermore, the second embodiment of the invention makes it possible to coat an object provided with a rear surface with a covering and at the same time to fix this rear surface on the second support. To that end, by positioning the combination yarn on the edge of the edge on the edge of the piece, by bonding the second support to the rear surface of the object, by heating the thermoadhesive material. Sealing the perimeter of the edge of the flexible piece to the back surface of the object and the second support,
Do it like this.

According to the third embodiment, similarly, in the first step, the object is coated with the cover, and finally the object is fixed on the support portion. For this purpose: -positioning the combination yarn on the side of the edge facing the rear face after folding the edge-fixing it after pulling on both ends of the combination yarn-supporting the object Placed on the part and connecting the conductive thread to the power supply to bond the object to this support.

Finally, the method according to the invention makes it possible to coat an object having a perimeter which is provided with a friculum groove around the rear surface. For that purpose, the combination thread is arranged so as to face the hiccup groove after the fold-back of the edge, so that the combination thread is inserted into this hiking groove under the action of a pulling force.

As long as the device makes it possible to carry out the method, the invention consists of: a core composed of electrically conductive threads surrounded by a thermoadhesive material, and an activation temperature of the surrounding material. A sheath body made of a knit of fibers of a thermoadhesive material which is activated at a near temperature, and is expanded into a combination yarn.

The invention likewise likewise provides the elastic layer, as obtained by the method according to the invention, with the surface which covers the front surface of the accessory of the seat, on its circumference or on the rear surface behind this front surface. Expanded to a seat accessory that includes a flexible covering that includes a sewn edge toward the surface, where the covering includes a seam on the edge of the edge. Heat comprising a conductive thread surrounded by auxiliary threads that are pierced to form and along which the conductive thread makes an adhesive connection between the edge of the edge and the perimeter of the front or back surface. It is characterized in that it is held by a band of adhesive fibrous material.

[0022]

Other features, objects and advantages of the invention include:
BRIEF DESCRIPTION OF THE DRAWINGS The detailed description is set forth below with reference to the accompanying figures, which are provided by way of example of preferred embodiments without limitation.

The method according to the invention has the purpose of covering an object, such as a seat accessory, with a flexible covering, which at its edges binds the combination threads which longitudinally sew the overlocking section. .. This flexible covering and its method of manufacture are described in the already mentioned European patent 0.223.312 which is shown in more detail below.

As shown in FIG. 1, the combination yarn 1 constrained in the interlocking portion is constituted by the heat-adhesive material 3 and the conductive yarn 2 surrounded by the knitted sheath body 4.

First of all, the conductive thread 2 is a metal thread of diameter varying between 4/10 ° mm and 6/10 ° mm. This thread is also enameled to make it electrically insulating.

The heat-adhesive enclosing material 3 itself has adhesive properties on the one hand to many materials, such as metals, plastics, porous materials (paper, cartons, leather, wood etc.) and, on the other hand, Then, it has an activation temperature in the range of 60 to 75 ° C., which is lower than the melting temperature of the overhanging portion (an example of a resin satisfying these criteria is “Termemelt” (T
HERMELT refers to what is marketed, the characteristics of which are technical cards (fiche).
chnique) “122 Ib 84 JJN”. )

The knitted sheath body 4, into which the core constituted by the electrically conductive yarn 2 and its surrounding material 3 has been introduced, is made of a knitted fiber of polyethylene and / or polypropylene base. This braided sheath has a melting temperature of the thermoadhesive material, ie of the order of between about 60 ° C and 75 ° C. The function of the braided sheath body 4 on the one hand facilitates the sewing of the combined thread 1 in the channel of the interlocking part, and on the other hand it has a contoured shape, for example the concave part of the edge of the flexible piece. Also restrains the conductive thread 2. Furthermore, the sheath reinforces the strip of thermoadhesive material which forms the adhesive connection of the covering on the support.

The method of coating an object with a piece of textile provided with a combination yarn is explained below in the scope of an application for the coating of seat accessories.

This coating is carried out by means of a press as shown schematically in FIG. This press is of the type shown in Figures 8 and 9 of the already mentioned European patent 0.223.312. This press comprises the device as generally described in the aforementioned patent, namely the frame 5,
A compression mechanism 6 constituted by a plate or a cross, a jack 7 supporting the compression mechanism 6 to enable the compression mechanism 6 to be moved vertically, a plate 8 positioned vertically to the mechanism 6 and a rear part of an accessory. It includes a gripping device 9 for ensuring that a tensile force is applied to both ends of the combined yarn 1 (see the above patent for details of these mechanisms and their operation).

The difference between the press according to the invention and the above-mentioned press lies in the structure of the gripping device 9. In fact, according to the invention, these gripping devices are constituted by crocodile-shaped clamping parts 9, each connected to one of the terminals of a power supply 11 via an electric wire 10. By way of example, this power supply 11 comprises an electronic transformer supplying a very low voltage (24V or 48V) strong current.

In contrast to the press of the aforementioned European patent, the press according to the invention further comprises an opposed mold 12 of an annulus of a shape and size which matches the perimeter of the rear face of the accessory to be coated, once the textile piece. When the edge portion of the fabric piece is folded back on the rear surface, a pressing force is applied to the edge portion of the fabric piece. Further, the opposed mold 12 is supported by a jack 13 which can move the opposed mold 12 vertically.

3 to 7 show an operating method by the above-mentioned coating press device.

A holding mold 14 is arranged in the center of the plate 8 and has a raised edge 14a whose shape is adapted to the shape of the accessory 15 to be coated. It is noted that instead of this type it is also possible to use a peripheral wall which is also filled with a bed of particles as described in European patent application 0.350.979.

The accessory 15 comprises a rigid support portion 15a and an elastic layer 15b of foam. The covering indicated at 16 is formed by a fabric piece which is precut out in the shape of an accessory so as to have an additional edge 16a and which is provided on the edge of the edge with the combination thread 1.

The fabric piece 16, the foam layer 15b and the rigid support 15a are superimposed in the mold 14 as shown in FIG. 3 and the edge 16a of the fabric piece is lifted by the mold edge 14a.

Next, the plate 6 is lowered by the operation of the jack 7 until the elastic layer 15b is compressed (FIG. 4).

The holding portions 9 are moved so as to approach each other (FIG. 5), and an operator crosses both ends of the combined yarn 1 to hook each end on the holding portion 9 on the opposite side. ..

Subsequently, the sandwiching portions 9 are separated from each other (FIG. 6). In the middle of this movement, the sandwiching portions apply a pulling force for contracting the edge portions 16a to both ends of the combination yarn 1 so that the edge portions are rigidly supported. It comes into contact with the rear surface of the part and is folded.

Once the edge 16a is folded, the opposed type 1
2 is lowered by the operation of the jack 13 so as to apply a pressing force to this edge portion (FIG. 7). Next, the sandwiching portion 9 is electrically energized for several seconds to raise the temperature of the conductive yarn 2 and cause the surrounding resin material 3 and the braided sheath body 4 to melt. The melted material spreads across the interlocking portions, thus forming a band which provides an adhesive fastening between the edge 16a of the fabric piece 16 and the rigid support 15a, the connection of which is of opposite type. It is increased by the pressing force provided by 12.

During this operation, a gutter (not shown) is further placed below the end portion of the combined yarn 1 to prevent the molten material from falling onto the accessory. It is done.

The method described above makes it possible to obtain an attachment as shown in FIG. 8 as a backrest, such an attachment, in particular with its edges completely fixed around its entire circumference on a rigid support. Therefore, it has a remarkably good finish quality.

[0042]

Since the present invention is constructed as described above, a covering body which covers the surface of an object and has an edge portion which is folded around the surface or on the opposite side is provided along the edge portion. Thus, by holding a fold on the edge portion by a pulling thread held by the covering body, the advantages of the conventional coating method of shrinking and fixing the peripheral edge or the rear surface of the object are held, and An improved method of coating an object is provided which can greatly extend the range of applications.

[Brief description of drawings]

1 is an enlarged perspective view of a combination yarn used to carry out the method according to the invention.

FIG. 2 is a schematic vertical cross-section of a coating press enabling the method according to the invention to be carried out.

FIG. 3 is a side view showing a schematic partial cross section showing an operation step of the coating method according to the present invention.

FIG. 4 is a schematic partial cross-sectional side view showing the next operation step of FIG. 3 of the coating method according to the present invention.

FIG. 5 is a schematic partial cross-sectional side view showing the next operation step of FIG. 4 of the coating method according to the present invention.

FIG. 6 is a schematic partial cross-sectional side view showing the next operation step of FIG. 5 of the coating method according to the present invention.

FIG. 7 is a schematic partial sectional side view showing the next operation step of FIG. 6 of the coating method according to the present invention.

FIG. 8 is a perspective view of a seat accessory obtained by the method according to the invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Combined yarn 2 Conductive yarn 3 Enclosing material 4 Sheath body 5 Press frame 6 Compression mechanism 7 Jack 8 Plate 9 Gripping device, that is, clamping part 10 Electric wire 11 Power source 12 Opposing type 13 Jack 14 Holding type 14a Raised edge part 15 Accessories 15a Rigid support of accessory 15b 15b Elastic layer of accessory 15 16 Cover of flexible fabric piece 16a Additional edge of flexible cover 16

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁵ Identification number Internal reference number FI Technical indication location B29L 31:58 4F (72) Inventor Jean Sonnier France 82350 Albias Toure (No address)

Claims (19)

[Claims] 1. A method for coating an object having a front surface covered by a flexible covering (16), the shape of which corresponds to the shape of the front surface of the object, and additionally on its outer contour. A piece (16) of flexible material having a flat edge (16a) is cut out, -a thread is pierced on said edge (16a) and a piercing line of said material and the outside on the edge of this piece. Forming an interlocking portion including a mating line, forming a passage extending between the two lines along the edge, and within the passage of the interlocking portion, inside and along the passage. A heat-adhesive material (3) which is made to be tacky by heating at a temperature lower than the melting temperature of the auxiliary thread and the soft material of the interlocking portion and arranged so that the length exceeding both ends thereof can be sewn. A combination including a conductive thread (2) coated with Arrangement of warp threads (1),-the edge (16) provided with the combination thread (1) by covering the front surface of the object with the piece (16).
a) so as to extend beyond the contour of the object, the edges (16a) being folded back at the edges of the object and both ends of the combination thread (1) engaging the passage. To reduce the length of the combined yarn (1) by applying a pulling force in the opposite direction to the conductive yarn (2) connected to a power source (11) to heat the thermoadhesive material (3). And then sealing the edge of the edge (16a) around the support (15a), which is a combination of steps. 2. A clamping part (9) electrically connected to a power source (11) for applying the tensile force to both ends of the combined yarn (1), and the clamping after applying the tensile force. Method according to claim 1, characterized in that electricity is supplied to the part (9). 3. The thermal adhesive coating material (3) is a metal,
It is possible to use a combination yarn (1) composed of a synthetic resin or a mixture of a large number of synthetic resins having the property of adhering to many materials such as plastics, porous materials (paper, carton, leather, wood etc.). Method according to any one of claims 1 or 2 characterized. 4. A combination yarn (1) comprising a braided sheath (4) made of a knit of thermo-adhesive fibers which are made adhesive at a temperature close to the activation temperature of the coating material (3). ) Is used. 5. Covering material (3) and knitted sheath (4)
5. A method according to claim 4, characterized in that a combination yarn (1) containing C is used, the activation temperature being in the range of approximately 60 to 75 ° C. 6. A combination yarn (1) according to any one of the preceding claims, characterized in that the conductive yarn (2) uses a combination yarn (1) coated with a layer of an insulating material such as enamel. How was done. 7. The method according to claim 1, wherein the combination yarn (1) is for coating an object having a rear surface opposite to the front surface. A method characterized in that it is arranged so as to face the rear surface after the edge (16a) is folded back. 8. The pressing force is maintained against the entire circumference of the edge of the piece during the work of adhering the edge onto the rear surface of the object. How 9. The method according to claim 7, wherein the rear surface has a non-linear contour, in particular a concave contour portion, at the edge of the rear surface. The projecting pieces are arranged at right angles to the curved areas of the respective parts of the concave profile, and--for the respective parts of the concave profile, the edges of the pieces are lapped together. A buttonhole arranged to be positioned perpendicular to the passage before forming the part, -folding the edge at the edge of the object, each buttonhole having one piece 8. A method according to claim 7, characterized in that the combination yarn (1) is built in and is supported inside the piece. 10. The combination yarn (1) is located at the edge of the piece above the edge (16a), and the second support is connected to the rear surface of the object. The heating of the heat-adhesive material (3) seals the perimeter of the edge of the flexible piece against the rear surface of the object and the second support. The method described in 7. 11. A method of coating an object having a rear surface facing a front surface, comprising: -folding the edge portion so as to face the rear surface, and then arranging the combination yarn (1) on the surface of the edge portion. -The object is arranged on a support, the conductive thread (2) is connected to a power supply (11), and the object is connected to the support. 7. The method according to any one of 7. 12. The method according to any one of claims 1 to 6, wherein an object having a peripheral portion provided with a hiccup groove around the front surface is covered, the combination yarn ( 1) is arranged so as to face the hiccup groove after the folding of the edge, such that the thread is inserted into the hiker groove when a tensile force acts. 13. An elastic layer (15b), comprising a flexible covering (16) covering the front surface of the accessory and including an edge (16a) which is folded back towards the surrounding or opposite surface, ie the rear surface. A seat accessory obtained by the method according to any one of claims 1 to 12, wherein the covering body forms an interlocking portion at an edge of the edge portion (16a). A conductive thread (2) held by an auxiliary stab thread, and located along the conductive thread (2),
Seat accessory, characterized in that it is held by a band of thermo-adhesive material (3, 4) which makes an adhesive connection between the rim (16a) and the perimeter of the front or rear surface. 14. A core composed of electrically conductive threads (2) coated with a thermoadhesive coating material (3) and heat activated at a temperature close to the activation temperature of the coating material (3). Coupling enabling a method according to any one of claims 1 to 12, characterized in that it comprises a sheath body (4) constituted by a knit of fibers of an adhesive material. yarn. 15. The coating material (3) is made of a synthetic resin or a mixture of synthetic resins which provides adhesive properties to a number of materials such as metals, plastics, porous materials (paper, cartons, leather etc.). The combination yarn according to claim 14, wherein the combination yarn is provided. 16. The coating material (3) and the braided sheath body (4) have an activation temperature in the range of approximately 60 to 75 ° C. 14.
The combined yarn according to any one of 1. 17. A combination according to any one of claims 14 to 16, characterized in that the braided sheath (4) is made of polyethylene and / or polypropylene based fibers. yarn. 18. The conductive thread (2) is 4 mm of 1 mm.
18. A wire according to any one of claims 14 to 17, characterized in that it is a metal wire with a diameter varying between 0 and 6/10.
The combination yarn described in the item. 19. The combined yarn according to claim 14, wherein the conductive yarn (2) is enamel-coated.