DE19732331A1 - Artificial grass seaming - Google Patents

Abstract

To stitch together large-surface webs of materials, especially artificial grass, the yarn(s) or yarn loop(s) passed through the stitching channel from one side are held at the other and pref. under side by a block. Also claimed is a sewing machine assembly with a needle plate (7) under the materials (1,2). A yarn catch (16), under the needle plate (7), moves across the seam (3), with two moving return units. The yarn catch (16) delivers and guides the lower yarn (18).

Description

The invention relates to a method and a sewing machine for Sewing together two large material webs, in particular Artificial turf lanes, the fabric lanes in the connection area Lying together side by side and by a thread from which one side, for example through the top of the web Thread stitches are connected to each other. Furthermore concerns the invention of an artificial turf pitch, which consists of a variety of individual artificial turf lanes and after the be procedures or using the machine described is made.  

The sewing together of large areas of material such as tarpaulins, Carpets or artificial turf is from the state of the Technology is a very arduous task. It is known, the two webs with their respective tops on each other put the sewing machine to the longitudinal to be connected run along the sides, with the two webs through a so-called overlock seam are sewn together.

Because in this sewing process the two goods to be sewn sheets lie on top of each other, they must then be unfolded and be folded down. Now the webs are with this Processes are sewn, for example, as artificial turf lanes trained which are up to 70 meters long, 4.5 meters wide and approx Are 2 tons. It is clear that for a change of one such a web a large number of people are required and repairs, for example, bringing in too additional seams on installed, not hinged goods tracks are simply impossible.

From DE-OS 44 19 455.2 is a method for sewing together of two large webs of goods, in which the material to be sewn next to each other, lying side by side and by a top thread in a zigzag seam with each other get connected. Through this object the overcome the handling problems described at the beginning, however, the seam is not reliable because of a damaged area the upper thread can cause the entire seam to dissolve.

It is therefore an object of the present invention to provide a method as described in the introduction to improve that a a safe and reliable seam is created. At the same time the known advantages should be maintained, namely the Material webs should be processable butt to butt.

To achieve this object, the invention is based on one  Procedure as described at the beginning and suggests that the from one side through the stitch channel in the web passed thread or thread loop on the other side the material web, for example the underside by a blockage element is held. Now, for example, the upper thread injured, for example because it is torn, then come loose some knots and loops of the upper thread, and the Upper thread may protrude from the web, but will another pulling out of the upper thread through the blocking element reliably prevented. Avoids the blocking element making sure that the upper thread is pulled through the stitch channel and so the seam continues to open. The blocking element is here either on one side or on a web or on two webs worked into the seam. Usually the blocking element is placed on the underside of the web orders, but it is also possible in the same way that Blocking element for example on the top, for example page visible to the user. By a appropriate color of the blocking element but this falls not on.

In a preferred embodiment of the invention is provided see that as a blocking element a piece of thread or a thread loop serves. The piece of thread or the thread loop can Example inserted as a bobbin thread in the sewing process are working and serve as a blocking element.

It is also possible to use a proportionate blocking element to use inelastic element. Here is for example on a small section thought, for example of art fabric or metal and is made in the from above stuck thread loop or thread loop is inserted and prevents the upper thread from being pulled back.

Advantageously, on both undersides of the web  sewn an adhesive layer in the connection area brings. This adhesive layer causes the incorporated Glue threads together and thus an improved connection surrender. The adhesive layer is also from the Sewing machine or the device for performing the method used up. The sewing machine has guide runners that the two Reach under and merge the webs of material. Before that Arriving in the area of the sewing needle is a front direction provided, the adhesive separates and the sub sides of the webs wetted accordingly.

Furthermore, it is also advantageous if the two webs below this a thread protection tape is laid. This thread protection tape can, for example, be a through Fabric or plastic tape reinforced by other means be, which in particular with rough pads, such as Example tar or concrete provide additional protection for the Sewing connection results. The thread protection tape works favorably together with the adhesive layer and causes sticking to the Side areas of the webs. This will make an additional one Hold and protection for the thread is achieved, favorably the thread protection tape can then not slip. The thread Protective tape is also from the device for Sewing held in reserve and, for example, in the still open Seam is inserted before the corresponding underside of the web Adhesive is spread. When integrating the insert of the thread protection tape and the application of the adhesive layer in The sewing machine does all of this in one processing step done with the sewing, making a considerable amount of work saving is achieved.

In a further embodiment of the method, that sheets of fabric abutting against each other in an arc to be sewn. The proposed method is not suitable only for sewing straight webs together  pieces, but also of web pieces that are arched bump into each other. Especially with these web pieces failed the previously known sewing processes, in which the sewing material webs were laid on top of each other and afterwards had to be folded down. Because of the different Curvature of an arch can be a sewing process in which the to sewing pieces are arranged one on the other, not attached be applied.

In the same way it is still possible, for example Repairs in the finished artificial turf or others Incorporate webs, these repairs or Processing also no longer folds down the web allow. The advantage of the proposed method is especially in that the webs according to their later position and no longer crazy, handled or otherwise moved.

Furthermore, the invention proposes a sewing machine that a needle arranged on the top side, which can be guided through the material web has, wherein a throat plate is provided on the Bottom of the web is guided, and that below the Stitch plate a thread catcher and movable across the seam at least one retractor that can be moved parallel to the seam is provided is seen and the thread catcher promotes and guides the lower thread. The upper thread is worked in through the needle and gripped on the underside by the thread catcher and into a Noose pulled up.

Further advantageous embodiments of the invention are in the Subclaims described.

The invention is shown schematically in the drawing. It demonstrate:  

Fig. 1a, 1b- Fig. 12a, 12b a sequence of steps of the inventive method, where index a is a plan view of the needle plate of the sewing machine according to the invention with the corresponding elements and index b indicates a vertical section, which indicates the application of method according to the invention, for example when sewing together an artificial turf track,

Fig. 13 in a plan view of the sewing machine according to the invention on an artificial turf according to the invention and

Fig. 14 is a side view of Fig. 13. The basic application and the area of application of the invention is shown in Fig. 13, 14, but Fig. 1a, b to Fig. 12a, b show the different process steps of the inventive method.

In Fig. 13 the two webs 1 , 2 are indicated, which are to be connected by the seam 3 . The sewing machine 4 moves along the seam 3 between the web 1 arranged on the left and the web 2 arranged on the right. The direction of movement of the sewing machine is marked with 40 net.

The fabric web 1 , 2 is an artificial turf web that is connected by the seam 3 .

The upper thread 5 is worked by the needle 6 through a stitch channel 60 generated by the needle 6 into the material web 1 , 2 .

With 7 the stitch plate is marked, which is located below the web 1 , 2 and is part of the sewing machine 4 . In the throat plate 7 , an elongated hole 8 is provided, which is arranged below the range of movement of the needle 6 , transversely to the seam 3 . The elongated hole 8 has a width which corresponds to the thickness of the needle 6 , the distance between the punctures of the needle 6 determining the length of the elongated hole 8 . Brackets 9 , 10 are provided on the left and right of the elongated hole 8 . These are arranged in the direction of movement 40 behind the elongated hole 8 . Within half of the counterholder 9 , 10 return devices 11 , 12 are provided, which are arranged essentially parallel to the direction of movement 40 of the sewing machine or perpendicular to the direction of movement (arrow 61 ) of the needle 6 . The return devices 11 , 12 have a hook 13 , 14 at their front end, which serves to take a thread and take it with it.

The two webs 1 , 2 , such as artificial turf, lie side by side in the connection area 15 . They lie abutting one another in such a way that the abutting edges or surfaces form the seam 3 .

The needle 6 penetrates the two webs 1 , 2 , a movement drive being provided for the alternating movement, which moves the needle in accordance with the double arrow 61 . At the same time, the needle is also able to perform an up and down movement (arrow 62 ) perpendicular to the direction of movement 61 . The movement of the needle 6 thus takes place in a plane that is perpendicular to the direction of movement 40 of the sewing machine. The sewing machine 4 (arrow 40 ) is driven, for example, intermittently or continuously by corresponding drives. Corresponding guide rollers are provided for this purpose, which guide the sewing machine to a new position after a completed stitching process or accordingly hold the material webs.

Below the needle plate 7 , a thread catcher 16 is provided parallel to the movement of the needle 6 (movement arrow 61 ) between the two webs 1 , 2 . The thread catcher 16 has a substantially horizontal bore 17 through which the lower thread 18 is guided and conveyed.

The lower thread 18 output by the thread catcher 16 is gripped by a catch hook 19 . This catch hook 19 is arranged on the left, for example, with respect to the elongated hole 8 outside of the counter holder 9 .

With the help of Fig. 1a, b through FIG. 12a, b which an individual process steps for the inventive stitching will now be described. The numbering of the steps, the corresponding figures and the steps in the claims is the same.

1st step ( Fig. 1a, b)

The needle 6 pierces the left web 1 and thus forms a stitch channel 60 . For this purpose, the needle 6 moves vertically downwards (arrow 62 ). The thread catcher 16 is in a left position, outside the elongated hole 8 and to the left of a piercing needle 6 .

The needle 6 is hollow and guides the upper thread 5 on the inside, the needle having a recess 63 in the lower region into which the thread catcher 16 can engage and take the upper thread 5 .

The thread catcher 16 in turn promotes the lower thread 18 in such a way that it will hold loop-like ge by a catch hook 19 .

2nd step ( Fig. 2a, b)

The thread catcher 16 moves from its initial position under the first material web 1 in the direction of the second material web 2 and catches the thread 5 introduced by the needle and draws up an essentially vertical triangle (or loop) 20 . The movement of the thread catcher 16 is identified here with 21 . The moving thread catcher 16 promotes the lower thread 18 . As shown in FIG. 2a, the lower thread 18 is guided through the triangle 20 . The lower thread 18 still hangs on the catch hook 19 .

In order to make it easier to grasp the introduced thread, the thread catcher 16 has a waist 33 which serves on both sides, that is to say for both movements of the thread catcher 16 .

For a better differentiation of the upper thread 5 and the lower thread 18 , the lower thread is drawn with a thinner line, the upper thread 5 is drawn with a thick continuous line.

As can be seen in FIG. 2 a, the cable loop 24 of the lower thread 18 is guided into the drawn thread loop 20 of the upper thread 5 by the movement of the thread catcher 16 . The two loops are placed one inside the other. This is brought about by the fact that the point of exit of the thread from the thread catcher 16 lies behind the upper thread 5 and the effective point of application of the thread hook 19 lies in front of the upper thread 5 . Since the stretched thread loop 24 is held by the hook 19 , the two loops or loops penetrate as described.

3rd step ( Fig. 3a, 3b)

The under the second web 2 (right web) arranged return 12 moves out of the retracted, rear position (movement arrow 22 ) to take the thread 5 used by the thread catcher 16 . Here, the retractor 12 grips the lower leg 23 of the triangle 20 with the hook 14 .

The catch hook 19 continues to hold the rope loop 24 formed by the lower thread 18 .

4th step ( Fig. 4a, b)

The retractor 12 grips the thread 23 and pulls the triangle 20 into an oblique position. The triangle 20 has an angled flank 23 which is now divided into two by the gripping by the hook 14 . In this respect, the term "Drei eck 20 " is not entirely correct. The retraction movement of the return fetch 12 is marked with 25 . The catch hook 19 continues to hold the lower thread 18 or the rope loop 24 formed therefrom.

5th step ( Fig. 5a, b)

The needle 6 inserted into the first web of material 1 is withdrawn ( 64 ), the slanted triangle 20 is placed essentially horizontally. The thread catcher 16 has an indentation 26 on both sides for optimal guiding and holding of the upper thread 5 , so that the thread 5 is guided securely by the thread catcher 16 . After the needle 6 is pulled out of the first web 1 , the triangle 20 is oriented essentially horizontally, the different horizontal position of the thread exit point from the web 1 and the position of the thread catcher 16 leading to a certain oblique position.

The catch hook 19 continues to hold the thread 18 .

6th step ( Fig. 6a, b)

The needle 6 is displaced essentially at right angles to the seam 3 to the right over the second web 2 (arrow 65 ). The catch hook 19 continues to hold the lower thread 18 in a rope loop 24 .

7th step ( Fig. 7a, b)

The needle 6 pierces the second web 2 , the one guided needle 6 piercing the spanned triangle 20 . The downward movement of the needle 6 is marked with the arrow 66 . The upper thread 5 now lies closely above the web 1 , 2 (based on the direction in which the needle 6 pierces). The thread loop formed by the lower thread 18 is released by the catch hook 19 . To do this, the catch hook 19 swivels counterclockwise (arrow 27 ).

Step 8 ( Fig. 8a, b)

The return device 12 arranged under the second web 2 moves forward, as a result of which the open thread triangle 20 is reduced. It should be noted here that the needle 6 with the upper thread 18 has already been passed through this thread triangle.

The lower thread 18 is either in front of or behind the needle 6 pierced by the second web 2 . By advancing the retractor 12 (indicated by the arrow 28 ), the opening through which the thread loop 24 of the lower thread 18 projects is reduced, the loop formed by the triangle 20 is reduced and closed.

Step 9 ( Fig. 9a, b)

The thread catcher 16 moves in the direction of the first goods web 1 , with a new, second vertical triangle being drawn up. The retractor 12 is disengaged from the thread 23 , so it releases it. The upper thread loop 20 thus released slides upward on the inserted needle 6 . The free thread section 23 now forms a connection between the two webs on the underside of the web 1 , 2 .

The thread loop 24 of the lower thread 18 is fixed and held in place by the now gradually closing loop or thread triangle 20 .

10th step ( Fig. 10a, b)

The retractor 11 of the first web 1 runs out of the retracted position, gripping the drip from the filament 16 brought up yarn 29 and pulls the second triangle 30 wrong. This is comparable to the procedure described in 4. Again, the lower leg of the triangle 30 , here marked with the thread section 29 , is gripped by the hook 13 on the retractor 11 and pulled backwards, as a result of which the triangle is deformed a little and is pulled obliquely. Furthermore, the lower thread loop 24 lies in the first thread triangle 20 of the upper thread 5 .

The back and forth movement of the return 11 is marked 31 .

11th step ( Fig. 11a, b)

The needle 6 is pulled upwards out of the second web 2 , the first loop 20 formed in step 9 being released, which slides on the last thread loop 30 and pulls it against the webs 1 , 2 to be sewn.

The moving needle 6 naturally tensions the introduced upper thread 5 and thus causes the two webs to contract at the seam 3 . This also leads to the knots reaching through knots 20 , 30 being pulled against the material web 1 , 2 and binding them firmly together. In the first upper web loop 20 there is the lower thread loop 24 , which acts here as a blocking element and effectively prevents it from being pulled out, in particular of the upper thread. The blocking element is then present on the channel 60 and prevents the upper thread 5 from being withdrawn through this channel 60 .

The thread loop 24 introduced by the lower thread is still in the first thread loop 20 and is now held there by the tightening loops. If the upper thread is now separated, the following usually happens that the loops 20 , 30 no longer hold each other and the entire seam opens. The thread loop 24, however, has such a configuration that it secures the rope loops 20 , 30 against one another, it being advantageous if this is also arranged within the second rope loop 30 . But it is also possible to arrange this outside the rope loop. Here is the position of the rope loop 24 depending on how the needle 6 is inserted through the second web 2 with respect to the rope loop.

Step 12 ( Fig. 12a, b)

The needle 6 is placed back on the first web 1 and a relative movement 40 between the needle 6 and the webs 1 , 2 is carried out, which corresponds to the normal translation of the sewing machine on the webs 1 , 2 to be sewn. The moving needle 6 tensions the upper thread 5 and pulls the loops 20 , 30 formed accordingly. As a result, the rope loop 24 formed by the lower thread 14 is pressed against the underside of the web and is bound there. The rope loop 24 has a length sufficient that it cannot be pulled through the stitch channels 40 , even if the upper thread 5 is severed.

The process steps described above describe both the Movement of the lower thread and the upper thread, the ge described processes relatively simultaneously or in same time segment.

It is also favorable here that the sewing, for example the underside of the web already coated with adhesive takes place through the additional fastening of the rope loop with each other or with respect to the underside of the web is possible.

The claims now filed with the application and later are attempts to formulate without prejudice to achieve further protection.

The backward relationships mentioned in the dependent claims point to the further training of the subject of the main claim by the features of the respective sub-claim there. However, these are not considered a waiver of achievement an independent, objective protection for the characteristics to understand the related subclaims.

Features previously only disclosed in the description can in the course of the process as of essential to the invention Significance, for example to differentiate it from the prior art be claimed.

Claims (17)

1. A method for sewing together two large-area goods webs, in particular artificial turf lanes, the goods webs lying side by side in the connection area and by a thread from one side, for. B. the top, the web by thread stitches mitei nander, characterized in that the / from one side through the stitch channel, carried out in the web thread or thread loop on the other side of the web, for example the bottom side, is held by a blocking element. 2. The method according to claim 1, characterized in that as a blocking element, a piece of thread or a thread loop fe serves. 3. Method according to one or both of the preceding An sayings, characterized in that as a blocking element serves a relatively inelastic element. 4. Method according to one or more of the preceding Claims, characterized in that as blocking elements  ment serves a bobbin thread, and an upper thread from the other side through the needle into the web is being processed. 5. The method according to one or more of the preceding claims, characterized by the sequence of the subsequent processing steps of the upper thread:

• 1.) The needle pierces the first web.
• 2.) The thread catcher arranged outside of the piercing needle (below half of the first web) moves in the direction of the second web and catches the thread introduced by the needle, and draws up a substantially vertical triangle. The thread catcher then remains below the second web.
• 3.) The retriever arranged under the second web moves forward from the retracted rear position in order to take the thread pulled by the thread catcher.
• 4.) The retractor pulls the thread, moves back and pulls the triangle into an oblique position.
• 5.) The needle inserted into the first web is withdrawn. The slanted triangle of threads is placed essentially horizontally.
• 6.) The needle moves above the two webs from a position above the first web to a position above the second web.
• 7.) The needle pierces the second web, the inserted needle piercing the first thread triangle.
• 8.) The retriever located under the second web moves forward, which reduces the width of the first triangle.
• 9.) The thread catcher moves in the direction of the first web of material, releasing the first thread loop and pulling a new, second vertical triangle open, whereby the retractor comes out of engagement with the thread. The retriever is then withdrawn. The released first thread loop slides upwards on the inserted needle.
• 10.) The retractor under the first web moves forward from the retracted position, grabs the thread brought up by the thread catcher, and pulls the second triangle askew.
• 11.) The needle is pulled upwards out of the second web, whereby the first loop (triangle) is released, which slides onto the last loop of yarn (second triangle) and pulls it against the webs.
• 12.) The needle is placed back on the first web, and a relative movement between the needle and the webs is carried out.

6. The method according to one or more of the preceding claims, characterized by the sequence of the subsequent processing steps of the lower thread:

• 1.) The lower thread is given by the thread catcher, which is arranged under the first web, and by a catch hook, which is also arranged under the first web, he gripped and held.
• 2.) The thread catcher moves in the direction of the second web and pulls the lower thread, which is guided over the catch hook, to a lower thread loop. The lower thread loop lies in the first thread triangle (loop) of the upper thread.
• 3.) The catch hook does not move.
• 4., 5., 6.) The catch hook begins to pull back and release the thread again.
• 7.) The thread loop formed by the lower thread is released by the catch hook.
• 8.) The lower thread emitted by the thread catcher lies behind or in front of the needle pierced by the second web.
• 9., 10.) The thread catcher moves from the position under the second web back under the first web. The lower thread loop lies in the first thread triangle of the upper thread and is pulled against the material web by the first loop, which slides on the needle against the material web.
• 11., 12.) The rope loop formed by the lower thread lies in the first thread loop in front of the second thread loop guided through it. The pulling thread loops press the lower thread loop against the web.

7. The method according to one or more of the preceding An sayings, characterized in that the respective, by the same numbering of the process steps ge denotes process steps of the upper or lower thread at the same time or in the same time segment gene. 8. The method according to one or more of the preceding An sayings, characterized in that on both goods undersides of the membrane before sewing in the connection area an adhesive layer is applied. 9. The method according to one or more of the preceding An sayings, characterized in that in the connection rich of the two webs below this one thread protective tape is inserted. 10. The method according to one or more of the preceding An sayings, characterized in that arc-shaped the impacting material webs are sewn together. 11. Sewing machine for carrying out the method according to one or more of the preceding claims, with a needle arranged on the top, which can be guided through the web, characterized in that a needle plate ( 7 ) is provided which is guided on the underside of the web ( 1 , 2 ) and that below the stitch plate ( 7 ) there is a thread catcher ( 16 ) which can be moved transversely to the seam ( 3 ) and at least one retractor ( 11 , 12 ) movable parallel to the seam ( 3 ) and the thread catcher ( 16 ) the lower thread ( 18 ) encourages and leads. 12. Sewing machine according to claim 11, characterized in that two retractors ( 11 , 12 ) are provided, which are arranged at a distance from one another and in the position of use, each under a web ( 1 , 2 ). 13. Sewing machine according to one or both of the preceding claims 11 to 12, characterized in that the thread gripper ( 16 ) has a constriction ( 33 ) for gripping the thread ( 5 ). 14. Sewing machine according to one or more of the preceding claims 11 to 13, characterized in that the needle ( 6 ) in a plane which is movable transversely to the seam ( 3 ) or transversely to the feed movement ( 40 ). 15. Sewing machine according to one or more of the preceding claims 11 to 14, characterized in that a catch hook ( 19 ) is provided for the lower thread ( 18 ). 16. Sewing machine according to one or more of the preceding claims 11 to 15, characterized in that the catch gerhaken ( 19 ) next to the return device ( 11 ), on the side facing away from the center of the sewing machine in the use position above the seam ( 3 ), is arranged . 17. Artificial turf pitch, which consists of a large number of individual Artificial turf lanes exist, which is based on a process and / or with a sewing machine according to one or more of the preceding claims is producible.