DE102011075827A1 - Method for sewing sewing material together - Google Patents

Abstract

The invention relates to a method for sewing together a first (102) and a second (104) sewing material with the following steps: - Sewing the first and second sewing material together by means of a sewing thread (104), a seam stub (304) being formed by the sewing together, Thermal flattening of the seam stub (304) by exerting a force on the seam stub (304) and simultaneous heating of the seam stub (304), the temperature of the heating being selected so that the sewing thread (100) is softened below its melting temperature.

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, to be sewn together using a sewing thread. This is especially the case with, for example, artificial leather blanks with polyester barking. 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 stub is kept as short as possible in the area of the sewing thread. 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, the shows DE 103 36 600 B3 a device for sewing and cutting a sewing material. Another device is from the US 2009/0090285 A1 known. Methods for sewing together sewing material are further from the WO 2006/013029 A1 and the US 2003/0221765 A1 known.

In contrast, the invention has for its object to provide an improved method of sewing a first and a second fabric and an improved apparatus for sewing a first and second fabric together.

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.

• – Zusammennähen des ersten und zweiten Nähguts mittels eines Nähfadens, wobei durch das Zusammennähen ein Nahtstummel entsteht,
• – thermisches Verflachen des Nahtstummels durch Ausübung einer Kraft auf dem Nahtstummel und gleichzeitige Erwärmung des Nahtstummels, wobei die Temperatur der Erwärmung so gewählt wird, dass der Nähfaden unterhalb seiner Schmelztemperatur erreicht wird

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 chosen 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 stump on the fabric after drawing a trim part with the fabric is not distinguished, while still ensuring that a high pull-out strength of the seam stub is. 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 seam stub. 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 become noticeable from the sewing material.

The thermal flattening of the seam stub and simultaneous heating of the seam stub or sewing thread makes it possible on the one hand for the sewing thread to be thermally deformed under the action of force on the seam stub so that a flattened seam stub 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. Preferably, this is done during or immediately after the sewing of the first and second fabric, which can be brought about by the shortening of the seam stub such a length that just prevents 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 butt to take a minimal form under the action of force, without, however, losing the mass necessary to prevent the suture stub from tearing when force is applied.

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.

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 lies the seam butt opposite side in the extended state of the fabric at a second stop, wherein above the first and the second stop Force is exerted on the seam stub. Preferably, the second stop 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 is a sign of the seam stub after disguise, d. H. Laminating a part with the sewing material optimally prevented. 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.

In a further aspect, the invention relates to a device for sewing together first and second material, the device comprising means for sewing together the first and second material by means of a sewing thread, wherein the stitching results in a seam stump, wherein the device further comprises means for thermal flattening 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 cowling, wherein the cowling 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 are explained in more detail with reference to the drawings. Show it:

1 different views of seam stubs,

2 a device for sewing and shortening a seam stub,

3 a cross-sectional view of a seam stub,

4 a cross-sectional view of a flattened seam stub,

5 a device for the thermal flattening of a seam stub.

Hereinafter, similar elements will be denoted by the same reference numerals.

The 1 shows seam stubs in different views. In the 1 If a side view is selected, in which only a first fabric 102 is visible. A second material is in this case directly below the first fabric 102 and is with the first sewing material 102 by means of a sewing thread 100 sewn together. Sewing together produces a protruding edge 304 , which is referred to as "seam stub".

In the 1b is the first sewing material 102 and a second fabric 104 which over the sewing thread 100 sewn together, shown in the extended, ie shirred state. Clearly visible is the cutting edge, along which the sewing thread 100 runs. Is now the seam stub 304 chosen too short, this leads to the fact that when laminating the first and second fabric 102 and 104 the suture stub 100 tears, ie a puncture resistance is no longer guaranteed. Such a ripping is for example in the 1c shown as an example.

For this reason, as already mentioned above, it is important that the suture stub 304 has a correspondingly large size, so that a tearing along the cutting edge in shirring of the first and second Nähguts 102 and 104 is avoided.

The 2 shows a device, which usually for sewing together the first and second fabric 102 and 104 is used. The sewing material 102 respectively. 104 (in 2 is only the sewing material 102 visible - the sewing material 104 is located directly below the sewing material 102 ) is going in the direction 200 guided. This is done by means of a needle 108 a sewing thread 100 sewn while using a knife 110 a shortening of the seam stub, ie a cutting of a part 106 of the projecting seam stub is made. The cut off part 106 finds no further use in the present invention.

The 3 shows the result of in 2 described sewing, namely the stitched together first and second fabric 102 respectively. 104 which over the sewing thread 100 held together. This cohesion takes place in the area 304 , ie in the area of the seam stub, instead. Will now from above and below by means of a first stop 300 and a second stop 302 a force on the seam stub 304 exercised while a thermal heating of the suture 100 brought about, this results in a softening of the suture 100 and optional softening of the first and second fabric in the region of the stub 304 , By applying the pressure, the area of the seam stub becomes at the same time 304 compressed in a direction perpendicular to the extension direction of the sewing material.

Also has the second stop 302 a recess 306 for shaping the seam stub 304 On, by the combination of pressure and warming is the seam stub 304 imposed a given form. For example, it is the recess used for this purpose 306 around a V-shape or a U-shape. The recess 306 also serves to guide the seam stub 304 towards the attacks 300 and 302 ,

The 4 shows the result of the exercise of force with simultaneous heating of the suture 100 , The seam stub 304 is shortened in a substantial way, so when relation of a part to be covered 402 the suture stub 304 not or only slightly insignificant. Nonetheless, when the first and second fabric are laminated, tearing occurs near the seam stub 304 prevented because the basic structure (physical and chemical) was not changed in the area of the seam stub. The first and second fabric, which protrudes in the area of the seam stub, was together with the sewing thread 100 merely separated and deformed, but this does not affect the given 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 have changed.

Overall, therefore, while maintaining the mechanical pull-out strength of the seam stub 304 a sign of the seam stub on the trim part 402 avoided. As a further consequence, this means that, for example, a seam trench on the cowling 402 To avoid a sign of the seam stub is not necessary, which is a cost-effective alternative to elaborate demolding of a trench, especially when hard-laminated components, or if no demoulding is possible.

The 5 shows a device for thermal flattening of the seam stub 304 , The two attacks 300 and 302 are formed in this case by rollers, again preferably the role 302 a recess for at least partial warming and guidance of the seam stub 304 having. So while the first and second fabric 102 and 104 pulled apart and in the direction 500 towards the roles 300 and 302 be moved, at the same time finds a heating of the seam stub 304 by means of a heating wedge 400 instead of. By this heating by means of the hot wedge 400 finds z. B. a softening of the suture stub itself, so that due to the subsequent force by the squeezing of the suture 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 also the possibility exists, the role 302 so to apply a temperature that at the contact of the suture stub 304 with the role 302 the softening process of sewing thread and, alternatively, seam stub to a desired temperature below the melting temperature of the sewing thread and below the melting temperature of the seam stub takes place. The role 302 thus additionally assumes the function of the hot wedge 400 ,

LIST OF REFERENCE NUMBERS

100

sewing thread

102

workpiece

104

workpiece

106

clippings

108

needle

110

knife

200

direction

300

first stop

302

second stop

304

seam stub

306

recess

400

wedge

402

cowling

500

direction

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10336600 B3 [0003]
• US 2009/0090285 A1 [0003]
• WO 2006/013029 A1 [0003]
• US 2003/0221765 A1 [0003]

Claims (10)

Method for sewing a first ( 102 ) and a second ( 104 ) Sewing material with the following steps: - sewing together of the first and second material by means of a sewing thread ( 104 ), whereby sewing together a seam stub ( 304 ), - thermal flattening of the seam stub ( 304 ) by applying a force to the suture stub ( 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. Method according to claim 1, wherein before the thermal flattening the first ( 102 ) and second ( 104 ) Fabric is pulled apart and laminated. Method according to claim 1, wherein prior to the thermal flattening of the seam stub ( 304 ) is shortened. Method according to claim 1, wherein the temperature of the heating is chosen such that the first ( 102 ) and second ( 104 ) Material below its melting temperature exclusively in the area of the seam stub ( 304 ) is softened. Method according to claim 1, wherein the heating of the seam stub ( 304 ) takes place via a hot wedge welding process. The method of claim 2, wherein in the exploded state of the first ( 102 ) and second ( 104 ) Sewing material of the seam stub ( 304 ) at a first stop ( 300 ) and the seam stub ( 304 ) opposite side to a second stop ( 304 ), with the first ( 302 ) and second ( 304 ) Stop the force on the seam stub ( 304 ) is exercised. Method according to claim 6, wherein the second stop ( 304 ) a recess ( 306 ) for at least partially receiving and guiding the seam stub ( 304 ) having. Method according to claim 7, wherein the shape of the recess ( 306 ) the shape of the thermally flattened seam stub ( 304 ) pretends. Device for sewing a first ( 102 ) and a second ( 104 ) Material, the device comprising: - means ( 108 ) for sewing together the first and second material by means of a sewing thread, wherein sewing together a seam stub ( 304 ), - means ( 300 ; 302 ; 400 ) for thermal flattening of the seam stub ( 304 ) by applying a force to the suture stub ( 304 ) and simultaneous heating of the seam stub ( 304 ), wherein the means for thermal flattening for selecting a temperature of the heating are formed so that the sewing thread ( 100 ) is softened below its melting temperature. Cowling ( 402 ), wherein the trim part with a first ( 102 ) and a second ( 104 ) Sewing material is laminated, wherein the first ( 102 ) and second ( 104 ) Sewing material is sewn together by a method according to any one of the preceding claims 1 to 8.

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