WO2012156188A1

WO2012156188A1 - Method for sewing up material to be sewn

Info

Publication number: WO2012156188A1
Application number: PCT/EP2012/057569
Authority: WO
Inventors: Behrang YAZDANI; Roland FETT
Original assignee: Faurecia Innenraum Systeme Gmbh
Priority date: 2011-05-13
Filing date: 2012-04-25
Publication date: 2012-11-22
Also published as: DE102011075827A1; EP2707531B1; EP2707531A1; DE102011075827B4

Abstract

The invention relates to a method for sewing up a first (102) and a second (104) material to be sewn, comprising the following steps: sewing up the first and the second material to be sewn by means of a yarn (104), wherein a seam bulge (304) is created by the sewing; thermally flattening the seam bulge (304) by exerting a force on the seam bulge (304) and simultaneously heating the seam bulge (304), wherein the temperature of the heating is selected in such a manner that the yarn (100) is softened below the fusion temperature thereof.

Description

Method for sewing sewing material together

description

The invention relates to a method for sewing together a first and a second material and a device for sewing together a first and a second material.

In particular, in the manufacture of interior trim of motor vehicles, it is often necessary that the blanks necessary for this purpose must be made individually, then sewn together using a sewing thread to become. This is especially the case! for example, artificial leather blanks with polyester bake. In order for the parts to be clad with artificial leather to have a high-quality visual appearance, it is necessary that the resulting suture stump be kept as short as possible in the region of the suture. Namely, if later sewn together sewing material and thereby pulled apart, makes itself too big seam stump noticeable as a bulge on the part clad with fabric.

For example, DE 103 36 600 B3 shows a device for sewing and cutting a sewing material. Another device is from the

US 2009/0090285 A1. Methods for sewing sewing material are also known from WO 2006/013029 A1 and US 2003/0221765 A1.

In contrast, the object of the invention is to provide an improved method for sewing together a first and a second sewing material and an improved device for sewing together a first and second sewing material.

The objects underlying the invention are achieved by the features of the independent claims. Preferred embodiments of the invention are indicated in the dependent claims.

A method of sewing a first and second fabric together is described, the method comprising the steps of:

Sewing the first and second fabric together by means of a sewing thread, whereby sewing creates a seam stub,

thermally flattening the seam stub by exerting a force on the seam stub and simultaneously heating the seam stub, the temperature of the heating being selected to reach the sewing thread below its melting temperature Embodiments of the invention have the advantage that sewing material can be sewn together in an optimum manner without having to shorten the seam stub unnecessarily severely. Thus, the seam stub on the fabric is not distinguished after having obtained a covering part with the sewing material, whereby nevertheless it is ensured that a high tear-out strength of the seam stub exists. Namely, if the seam stub chosen too short, this would mean that the sewing thread used binds the first and second fabric together on an insufficiently large contact surface. The consequence would be that the lamination of the sewing material increases the likelihood of tearing at the suture stump. If, on the other side, the seam stub chosen to be larger, this would indeed increase the pull-out strength, but the seam stub would undesirably emerge from the sewing material.

The thermal flattening of the suture tip and simultaneous heating of the suture stub or suture makes it possible on the one hand for the suture thread to be thermally deformed under the action of force on the suture stub in such a way that a flattened suture stump can result. On the other hand, however, the sewing thread remains in its basic molecular and physical structure so that no loss of quality in terms of tear resistance of the suture are to be feared.

According to one embodiment of the invention, the first and second fabric are pulled apart before the thermal flattening. This has the advantage that in an optimal way the seam stub is squeezed together with the sewing thread in its desired final shape. Thus, the shape of the seam stub can be optimally defined.

According to a further embodiment of the invention, the seam stub is shortened before the thermal flattening. This preferably takes place during or immediately after the sewing together of the first and second sewing material, whereby the length of the seam stub can be shortened to such a length which just prevented a tearing of the seam stub under force on the first and second fabric.

According to a further embodiment of the invention, the temperature of the heating is further selected so that the first and second material is softened below its melting temperature exclusively in the region of the seam stub. This additionally allows the seam mute! under the action of force takes a minimal form, but without losing the mass which is necessary to prevent tearing of the seam stub under force.

According to a further embodiment of the invention, the heating of the seam stub takes place via a hot wedge welding process. Such a method has the advantage that it can be realized in a technically simple manner. Alternatively, it is possible to perform the heating of the seam stub by means of a laser.

According to a further embodiment of the invention lies in the exploded state of the first and second fabric of the suture stub at a first stop and also the opposite side of the seam stump is in the extended state of the fabric at a second stop, wherein the first and the second stop the Force is exerted on the seam stub. In this case, the second stop preferably has a recess for at least partially receiving and guiding the seam stub. For example, the shape of the recess gives the final shape of the thermally flattened seam stub. Thus, such a shape of the seam stub can be selected, which optimally prevents marking of the seam stub after covering, ie lamination of a part with the sewing material. The guide of the seam stub helps in the movement of the seam stump to be flattened in the direction of the first and second stop. It is also possible that the second stop in addition to the function as a counter-stop in the Verfiachung the seam stub also serves as a counter-stop for the hot wedge. This could be realized by the second stop being a waist or roll. In a first In the second part of the roll, the material to be sewn is pressed through the heating wedge and in a second region of the roll the material to be sewn is pressed through the first stop.

According to one embodiment of the invention, a hot wedge used for the hot wedge welding process is applied directly to the seam stub in front of the first stop. "Immediately before the stop" means a maximum distance of 0.5-1 cm from the first stop have the advantage that already held by the first and second stop the Nahtstummei and is thereby pressed against the hot wedge so it eliminates a relation to the hot wedge to be attached counter-attack to the hot wedge on the running between this counter-stop and the Heizkeil Nahtstummei against the Heizkeii The optimum heat transfer is realized by the positive guidance through the first and second stop and pressing on of the suture stub on the heating element located immediately before the first stop

Furthermore, this could have the advantage that immediately after the heating of the softened Nahtstummei the attacks for flattening is supplied immediately. There is virtually a heating "directly on site", without, however, the need for heating of the attacks themselves exists.This can be chosen for the attacks in particular a material such as plastic such Siiikon, which can deform on the one hand, the softened material On the other hand, it has enough elasticity to easily give way to the shape of the suture, which increases the material quality of the flattened suture stub, since it was not simply pressed by force, but could adapt itself optimally to the contour of the stops , It should be noted that it is sufficient if one of the stops consists of said plastic material. The other stop can be made of metal. According to one embodiment of the invention, the stops are in the form of rotating rollers. This minimizes friction due to the rotational capability of the stops between the stops and the suture die. In principle, the heating of the seam stub takes place before it is fed to the stops for flattening. In a further aspect, the invention relates to an apparatus for sewing together first and second fabric, the apparatus comprising means for sewing the first and second fabric together by means of a sewing thread, wherein sewing creates a seam die, the apparatus further comprising means for thermally flattening the fabric Seam stub by exerting a force on the seam butt and simultaneous heating of the seam stub, wherein the means for thermal flattening for selecting a temperature of the heating are formed so that the thread is softened below its melting temperature. In a further aspect, the invention relates to a trim panel, wherein the trim panel is laminated with a first and a second fabric, wherein the first and second fabric is sewn together by the method described above. In the following, preferred embodiments of the invention will be explained in more detail with reference to the drawings. Show it:

1 shows various views of seam stubs, FIG. 2 shows a device for sewing and shortening a seam stub,

FIG. 3 is a cross-sectional view of a seam stub;

FIG. 4 is a cross-sectional view of a flattened seam stub;

5 shows a device for the thermal flattening of a seam stub. Hereinafter, similar elements will be denoted by the same reference numerals.

FIG. 1 shows seam stubs in different views. In FIG. 1, a side view is selected in which only a first material 102 is visible. A second fabric is in this case directly below the first

Sewing material 102 and is sewn together with the first fabric 102 by means of a sewing thread 100. By stitching results in a supernatant

Edge 304, which is referred to as "seam stool".

In FIG. 1 b, the first fabric 102 and a second fabric 104, which are sewn together over the sewing thread 100, are in an exploded, i. shirred state shown. Clearly visible is the cutting edge along which the sewing thread 00 runs. If the seam stub 304 is set too short, this results in the seam stub 100 being torn out during lamination of the first and second fabric 102 and 104, i. a puncture resistance is no longer guaranteed. Such a tearing is shown by way of example in FIG. 1c.

For this reason, it is important, as already mentioned above, that the seam flute 304 has a correspondingly large enough size so that tearing along the cutting edge when shirring the first and second sewing material 102 and 104 is avoided.

FIG. 2 shows a device which is usually used for sewing the first and second fabric 102 and 104 together. The sewing material 102 or 104 (in FIG. 2, only the sewing material 102 is visible - the sewing material 104 is located directly below the sewing material 102) is guided in the direction 200. In this case, a sewing thread 100 is sewn in by means of a needle 108, wherein at the same time using a knife 1 10 a shortening of the seam stub, ie a cutting of a portion 106 of the projecting seam stub is made. The cut portion 106 finds no further use in the present invention. FIG. 3 shows the result of the sewing process described in FIG. 2, namely the stitched together first and second sewing material 02 and 104, which are held together above the sewing thread 100. This cohesion takes place in the area 304, ie in the area of the seam stub. If a force is exerted on the seam stub 304 from above and below by means of a first stop 300 and a second stop 302 and at the same time brings about thermal heating of the sewing thread 100, this results in a softening of the sewing thread 100 and an optional softening of the first and second Sewing material in the region of the stub 304. By the application of pressure at the same time the area of the seam stub 304 is compressed in a direction perpendicular to the extension direction of the sewing material.

In addition, if the second stopper 302 has a recess 306 for shaping the seam stub 304, the seam stub 304 is forced into a predetermined shape by the combination of pressure and heating. For example, the recess 306 used for this purpose is a V-shape or a U-shape. The recess 306 also serves to guide the seam stub 304 in the direction of the stops 300 and 302. Figure 4 shows the result of the application of force with simultaneous heating of the suture 100. The seam stub 304 is shortened in a substantial way, so that in relation to a part to be covered 402, the seam stump 304 is not or only slightly insignificant. Nevertheless, when laminating the first and second fabric, tearing in the region of the seam stub 304 is prevented, since the basic structure (physical and chemical) in the area of the seam stub has not been changed. The first and second fabric, which protrudes in the area of the seam stub, has come together with the sewing thread 100 merely separated and deformed, whereby this has not changed the predetermined mass and mechanical strength and the relative position of the protruding parts of the first and second fabric in the region of the seam stub 304 and thread 100. Overall, while retaining the mechanical pull-out strength of the seam stub 304, a marking of the seam stub on the lining part 402 is avoided. As a further consequence, this means, for example, that a suture trench on the lining part 402 is not necessary to avoid signing the seam stump, which represents a cost-effective alternative to the complex demolding of a trench, in particular for hard-laminated components, or if no demoulding is possible ,

FIG. 5 shows a device for thermally flattening the seam die 304. The two stops 300 and 302 are formed in this case by rollers, wherein again preferably the roller 302 has a recess for at least partial heating and guidance of the seam stub 304. Thus, while the first and second fabric 102 and 104 are pulled apart and moved in the direction 500 toward the rollers 300 and 302, heating of the seam stub 304 by means of a heating wedge 400 takes place simultaneously. By this heating by means of the heating wedge 400, e.g. a softening of the seam stub itself takes place, so that due to the subsequent application of force by the squeezing of the seam stub between the rollers 300 and 302, a thermal flattening of the seam stub 304 takes place.

It should be noted, however, that instead of a separate hot wedge 400, it is also possible to pressurize the roller 302 with a temperature such that upon contact of the suture stub 304 with the roller 302, the softening process of suture and, alternatively, suture butt to a desired temperature below that Melting temperature of the suture and below the melting temperature of the suture stub takes place. The roller 302 thus assumes the additional function of the heating wedge 400. Reference number list

100 sewing thread

102 sewing material

104 sewing material

106 clippings

108 needle

1 10 knives

200 direction

300 second stop

302 first stop

304 suture num

306 recess

400 heating wedge

402 cowling

500 direction

Claims

claims

A method of sewing first (102) and second (104) workpieces together, comprising the steps of:

Sewing the first and second fabric together by means of a sewing thread (104), whereby sewing together forms a seam stub (304),

- Thermal flattening of the suture stub (304) by exerting a force on the suture midge! (304) and simultaneous heating of the seam stub (304), wherein the temperature of the heating is selected so that the sewing thread (100) is softened below its melting temperature.

2. The method of claim 1, wherein prior to the thermal flattening of the seam stub (304) is shortened.

3. The method according to any one of the preceding claims, wherein the temperature of the heating is selected so that the first (102) and second (104) sewing material is softened below its melting temperature exclusively in the region of the seam stub (304).

4. The method according to any one of the preceding claims, wherein the heating of the seam stub (304) takes place via a hot wedge welding method.

5. The method according to any one of the preceding claims 1-3, wherein the heating of the Nahtstummeis (304) by means of a laser.

6. The method according to any one of the preceding claims, wherein before the thermal flattening, the first (102) and second (104) sewing material is pulled apart, wherein in the extended state of the first (102) and second (104) sewing material of the seam stub (304) on a abuts first stop (300) and the seam stub (304) opposite side of a second stop (304) is applied, wherein on the first (302) and second (304) stop the force is exerted on the seam stub (304).

7. The method of claim 6, wherein a used for the Heizkeilschwei ßverfahrens hot wedge is applied directly to the seam stub in front of the first stop (300).

8. An apparatus for sewing together first (102) and second (104) workpieces, the apparatus comprising:

Means (108) for stitching together the first and second fabric by means of a sewing thread, wherein the stitching creates a seam stub (304),

- means (300; 302; 400) for thermally flattening the seam stub (304) by exerting a force on the seam stub (304) and simultaneously heating the seam stub (304), the thermal flattening means being adapted to select a temperature of heating in that the sewing thread (00) is softened below its melting temperature.

9. The apparatus of claim 8, wherein the second stopper (304) has a recess (306) for at least partially receiving and guiding the suture stub (304).

10. Apparatus according to claim 8, wherein the shape of the recess (306) the

Form of thermally flattened seam stub (304) pretends.

1 . Covering part (402), wherein the trim part is laminated with a first (102) and a second (104) sewing material, wherein the first (102) and second (104) sewing material is sewn together by a method according to one of the preceding claims 1 to 7.