DE202011002021U1 - ladder cord - Google Patents

Abstract

Ladder cord (11) for a Venetian blind (1) or a Venetian blind consisting of a first, front, in particular woven, crocheted or braided, longitudinal band (2) and one, arranged at a horizontal distance therefrom and connected thereto via a plurality of transverse webs (4) second, rear, in particular woven, crocheted or braided, longitudinal strip (3), wherein the transverse webs (4) in the direction of the longitudinal strips (2, 3) are arranged at a vertical distance from each other and each consist of two transverse bands (5, 6), each branching at least approximately at the same level in pairs from the longitudinal strips (2, 3), characterized in that a vertical distance (12) between each two transverse webs (4) on the first, front longitudinal strip (2) is permanently larger than a vertical distance (13) between each two transverse webs (4) on the second, rear longitudinal band (3).

Description

The invention relates to a ladder cord for a Venetian blind or Venetian blind consisting of a first, front, in particular woven, crocheted or braided, longitudinal band and one, arranged in a horizontal distance therefrom and connected to it via a plurality of transverse webs, second, rear, in particular woven, crocheted or braided, longitudinal band, wherein the transverse webs are arranged in the direction of the longitudinal strips at a vertical distance from each other and consist of two transverse bands, each branching at least approximately at the same level in pairs from the longitudinal bands, a Venetian blinds or blinds, comprising a plurality of Lichtlenklamellen which are arranged on straps, a method for producing a ladder cord for a venetian blind or a blind, after which from individual yarns a first, front, in particular woven, crocheted or braided, longitudinal band and, arranged at a horizontal distance therefrom s and with this over several transverse webs connected, second, rear, in particular woven, crocheted or braided, longitudinal band, are produced, wherein the transverse webs are arranged in the direction of the longitudinal strips at a vertical distance from each other and each consist of two transverse bands, each at least approximately branch off on the same level in pairs from the longitudinal strips, wherein optionally the finished ladder cord is rolled on a spool or a roll, and an apparatus for producing such a ladder cord, wherein the device a plurality of holding means for yarn packages and downstream in the production direction at least one coil or a Roller comprises, on which the finished ladder cord is wound up.

Venetian blinds or blinds are not only used as privacy screens, but also as glare protection against incident sunlight. Conventional, simple external blinds or Venetian blinds consist of a plurality of individual slats, which are either attached via hooks on so-called loop cords, or are threaded between two transverse bands of a so-called ladder cord. The distance between the loops or the transverse bands is normally the same for the front longitudinal band as for the rear longitudinal band. Related to this is that all slats are arranged in each position at the same angle to each other or against the horizontal. For energetic reasons, as well as for reasons of well-being, it is desirable that in daylight, although the glare protection is given, however, so much daylight is let into the room that an artificial lighting is not required. For this purpose, so-called Lichtlenklamellen from the prior art, for example, the DE 102 60 711 A1 , known. The slats are differently inclined over the course of the height of the blind with increasing transparency from bottom to top.

From the US 6,227,279 B a Venetian blind is known in which the number of slats is divided into two segments, each segment has its own turning mechanism for the slats, so so for example to avoid the incidence of light, the lower slats of the blind can be pivoted to the closed position and the upper Slats can be placed in a position that allows light to enter the room. A similar system describes the EP 1 508 664 A1 , in which the curtain of a slat blind is divided into an upper curtain and a lower curtain. In this case, the lower curtain has no direct connection with the outer turning tapes of the upper curtain. The bottom slat of the upper curtain and the top slat of the lower curtain are connected by straps and the inner turning tapes. It is thus achieved in turn that the slats of the lower curtain and the slats of the upper curtain can be adjusted independently of each other in inclination. These types of external blinds are structurally relatively complex and therefore expensive.

A similar, but structurally simpler system describes the US 2002/038694 A1 , It will be normal, curved lamellar sheets used, so no Lichtlenklamellen, in turn, the Venetian blinds is divided into an upper curtain and a lower curtain and the lamellar leaves are arranged in the upper curtain such that the light is reflected in the interior, whereas in the lower curtain these lamellae are oriented exactly in reverse, so that the light is reflected against the arc. However, with this system, the lamellae are again arranged at the same distance from each other, the glare of the incident sunlight can not be completely excluded.

From the EP 0 609 541 A1 It is known to keep the lamellae with lowered Lamellenbehang by at least two standing with a rocker in operative connection, vertical pairs of strands at a mutual distance. In order to achieve optimum incidence of the outside light in a darkened room, it is provided that the distance between the outer lamellar edges is greater than the distance of the respective inner lamellar edges between all lamellas. Again, this is a structurally complex design of Rafflamellenstore given by the use of the two rockers.

From the DE 295 12 108 U1 or the DE 202 17 300 U1 Fittings are known for shortening ladder cords in blinds. By shortening the ladder cords, it is possible to be able to set at least partial areas of a blind differently. These clamps are mounted during assembly to the ladder cords and to achieve a horizontal slat position in the upper blind area and a largely closed slat position in the lower Behangteil. The disadvantage here, however, that this shortening must be made by hand, whereby the assembly costs increases.

It is further known from the prior art, as already stated above, to use so-called loop cords, as this example, generally in the DE 21 11 237 C are described in which protrude at regular intervals from the strap loops. For the suspension of the slats, a front strap and a rear strap must be used, but they are separated. This makes it relatively easy to produce the two straps separately and thus also each different distances between the loops, that is to provide in particular with larger distances in the front strap and shorter distances in the rear strap. The disadvantage here is that with such loop cords slats are used, which are crimped on the slats longitudinal edges in order to use in the region of this flanging the corresponding hooks with which the slats are then secured in the loop cords. Again, the effort in the production of these slats is increased.

Based on this prior art, it is the object of the invention to provide a simple way by which the slats of a Venetian blinds or blinds can be adjusted so that on the one hand a reduced glare and on the other hand optimal light can be achieved simultaneously.

This object of the invention is achieved in each case independently by the above-mentioned ladder cord, venetian blinds, the method for producing a ladder cord and the device for producing a ladder cord, wherein the ladder cord a vertical distance between two transverse webs on the first, front longitudinal band lasting, d. H. permanently, is greater than a vertical distance between each two transverse webs on the second, rear longitudinal band, the Venetian blind or blind comprises the ladder cord according to the invention, in which method the front and / or the rear longitudinal band and optionally the transverse bands made of at least two different threads or yarns be different in thermal shrinkage, wherein the number of threads or yarns with the greater thermal shrinkage in the two longitudinal bands is different and in which after the production of the longitudinal strips they are subjected to a thermal treatment, according to an embodiment of the method is provided that a vertical distance between each two transverse webs on the first, front longitudinal belt is made larger than a vertical distance between each two transverse webs on the second, rear longitudinal belt and that as a coil or roller at least a two-part coil or Roller is used, with a first part coil or sub-roll for the front longitudinal belt and a second sub-reel or sub-roller for the rear longitudinal belt, wherein the two sub-coils or sub-rollers are driven at a different speed and / or have a different diameter, and wherein the inventive An at least two-part spool or roller is used with a first partial coil or partial roller for the front longitudinal belt and a second partial coil or partial roller for the rear longitudinal belt, wherein the two partial coils or partial rollers are drivable at a different speed and / or have a different diameter.

Due to the inventive design of the conductor cord, it is possible to achieve the already known from the prior art advantages, namely shading in the lower curtain area with simultaneous light control in the upper curtain area, a blind or a Venetian blind with simplistic, especially not necessarily a crimp carrying out the advantage of the fact that these slats need only be inserted between the two transverse bands of the transverse webs and not previously a hook element for hooking into a loop cord must be mounted. Although the production of the ladder cord is somewhat more complicated compared to the loop cords known from the prior art, the manufacture can be fully automated by machine, so that the advantage in the final assembly of the external blinds or blinds outweighs this disadvantage. Such an embodiment of venetian blinds or blinds with light-guiding function was not obvious to the person skilled in the art, since the two longitudinal strips are connected to one another in a fixed manner via the two transverse webs, whereby the different distances between the transverse webs on the front and on the rear longitudinal strip with a conventional device to produce a ladder cord without separate measures are not feasible, unlike loop cords in which the individual strands can be made separately. For the production of the ladder cord, it proves to be an advantage if yarns of threads are used, the at least partially have a different thermal shrinkage, so that adjusts the different distance between the transverse webs on the front longitudinal band and the rear longitudinal band by the subsequent thermal treatment of the conductor cord due to the different thermal shrinkage. On the other hand, it is also advantageous if the conductor cord is wound on a two-part spool or roller, wherein the two sub-coils or sub-rollers are operated at different speeds or they have a different diameter, so as to better the difference in length between the front and the rear longitudinal belt to be able to compensate. This procedure has the advantage that the ladder cord can be produced per se from yarns customarily used for this purpose, so that it is therefore not absolutely necessary to use, for example, yarns with different thermal shrinkage.

By the term permanent or permanently larger in terms of the different distances of the transverse webs at the front and at the rear longitudinal band of the ladder cord is meant that although minor, weather-related changes in the distances are possible, for example in the amount of up to 10% based on the initial length of the distances However, the changes are not so great that the difference in the size of the distances compensates.

The vertical distances between in each case two transverse webs on the first, front longitudinal band and on the second, rear longitudinal band are preferably constant over a conductor cord length in each case. It is thus not only a simpler, more mechanical production of the ladder cord allows, but the bifunctionality of external venetian blinds or blinds are better met by namely when the slats in the lower part of the venetian blind or blinds closed the slats in the upper part of a larger cross section for the deflection of the incident light in the interior, ie in the direction of the ceiling of a room, allow.

By the term "constant" it is meant in the sense of the invention that slight deviations between the distances of the transverse webs, which are machine-related, are tolerated to an extent of 10%.

As already stated above, according to a preferred embodiment of the ladder cord is provided that the second, rear longitudinal band comprises at least two different threads or yarns, which differ in the thermal shrinkage, or that the second, rear longitudinal band of threads or yarns is formed, which have a greater thermal shrinkage than the threads or yarns which are used to make the front, first longitudinal band. In the event that threads or yarns with different thermal shrinkage are also used in the front, first longitudinal band, it is provided according to a further embodiment that the number of threads with the greater thermal shrinkage in the second, rear longitudinal band is greater than in the first, front longitudinal ligament. It is thus possible by simply heating or heating after production, that is in particular the weave, crochet or braiding the ladder cord to adjust the different distances between the transverse webs on the first, front and on the second, rear longitudinal belt. With this embodiment, existing systems for the production of conductor cords can continue to be used, since up to the thermal aftertreatment does not have to take into account the different distances.

In addition, it should be mentioned at this point that the ladder cords are usually made from yarns that have been formed from the corresponding threads.

According to another embodiment variant of the ladder cord, it is provided that the thread or the threads or the yarn or the yarns with the greater thermal shrinkage form or form the weft threads of the fabric. In principle, the embodiment in which these threads or yarns with the greater thermal shrinkage than warp threads are used, although possible, but with the embodiment in which these threads form the weft threads, the advantage that after the shrinkage substantially in the transverse direction to the longitudinal extent of the longitudinal strips takes place, in particular the constant distance between the transverse webs can be better adjusted.

It is also possible that the thread or the yarns or the yarn or yarns with the greater thermal shrinkage in the core of the longitudinal strips or are arranged so that these threads or yarns are outside at least partially surrounded by threads with a lower thermal shrinkage, which is characterized by the thermal Aftertreatment and the resulting shrinking setting a better bond between the individual threads or yarns and thus the ladder cord receives a higher mechanical stability.

According to another embodiment of the ladder cord is provided that the thread or the threads or the yarn or yarns with the greater thermal shrinkage of at least one of the conductor strips have at least 15% greater thermal shrinkage than the thread or threads or the yarn or yarns with the lower thermal shrinkage, whereby the difference in length between the transverse webs can also be adjusted more easily. In particular, however, it is also achieved that the temperature of the thermal aftertreatment can be lower than in variants with less difference in the thermal shrinkage between the threads or yarns, whereby the thermal load on the threads is reduced and thus the conductor cord can have a longer service life.

In particular, the difference in thermal shrinkage may be at least 25%, preferably at least 40%.

For the same reasons, it is advantageous if the thread or the threads or the yarn or the yarns with the greater thermal shrinkage has or have a value for the thermal shrinkage of at least 6%.

In particular, this value is at least 10%, preferably at least 18%.

In the course of testing the invention, it has been found that it is advantageous for adjusting the length difference between two transverse webs on the front and on the rear longitudinal band, when the longitudinal bands consist of a fabric of polyester threads and threads of a, in particular aromatic, polyamide, wherein instead of a fabric, the conductor strips can also be crocheted or braided from these two different threads or yarns.

At least the first, front longitudinal band may be at least partially made of threads or yarns made of a UV-resistant material or with a UV-resistant equipment, so that by the UV load, which occurs reinforced in the front longitudinal band compared to the rear longitudinal band, no Influencing the difference in length between the transverse webs on the front and on the rear longitudinal band over the life of the ladder cord occurs. It is thus achieved that the ladder cord has essentially the same properties over its lifetime.

On the other hand, according to embodiments, there is the possibility that the second, rear longitudinal band is made of at least two threads or yarns having a different cross section or that the first, front longitudinal band is made of threads or yarns which are one of the threads or yarns of the the second, rear longitudinal band comprises threads or yarns which have a greater dtex value than the threads or yarns of the first, front longitudinal band or the second, rear longitudinal band comprises threads or yarns which have a smaller diameter Have elasticity, as the threads or yarns of the first, front longitudinal band. By these embodiments, the mechanical behavior and the thermal behavior of the threads is also influenced, which in turn makes it easier to control the production of the differences in length between the transverse webs on the first, front longitudinal band and the second, rear longitudinal band.

For the same reason it can also be provided that the number of threads or yarns of the first, front longitudinal band is different from the number of the second, rear longitudinal band, in particular in the rear longitudinal band a smaller number of threads is used, so that the thermal fixation of the longitudinal strips, which is usually carried out in conventional ladder cords, on the first, front longitudinal band causes a lower effect than the second, rear longitudinal band.

According to one embodiment variant of the method, it is provided that the front longitudinal belt is thermally treated at a lower temperature than the rear longitudinal belt. Also by this measure, the adjustment of the different distances between the transverse webs on the front longitudinal band and the rear longitudinal band is easier to carry out.

For a better understanding of the invention, this will be explained in more detail with reference to the following figures.

Each shows in a highly schematically simplified representation:

1 : a detail of a Venetian blind with Lichtlenklamellen in side view;

2 A device for producing a conductor cord according to the invention.

By way of introduction, it should be noted that in the differently described embodiments, the same parts are provided with the same reference numerals or the same component names, wherein the disclosures contained in the entire description can be mutatis mutandis to the same parts with the same reference numerals or component names. Also, the location selected in the description, such as. B. top, bottom, side, etc. related to the immediately described and illustrated figure and are mutatis mutandis to transfer to a new position on a change in position. Furthermore, individual features or combinations of features from the shown and described different Exemplary embodiments represent independent solutions according to the invention.

In 1 is an external blind 1 partially shown in side view. This external blind comprises a first, front, vertical longitudinal band 2 and a second, rear, vertical longitudinal band spaced therefrom in a horizontal direction therefrom 3 , The two longitudinal bands 2 . 3 are over a plurality of vertically arranged one above the other and spaced apart transverse webs 4 connected to each other, wherein each crosspiece an upper transverse band 5 and a bottom cross band 6 having. The two transverse bands 5 . 6 a crossbar 4 branch in pairs at least approximately at the same level from the front longitudinal band 2 or rear longitudinal band 3 from, where by "at least approximately" is meant that the two transverse bands 5 . 6 may be slightly spaced apart due to the material thickness. Usually, these transverse bands 5 . 6 from the yarns of the front longitudinal band 3 or rear longitudinal band 3 formed as known in the art. In addition, this includes external venetian blinds 1 or the blind, as is also known from the prior art, a head rail and a foot rail, wherein the foot rail is connected to an elevator belt to the external blinds 1 or lower or raise the blind.

Through the two transverse bands 5 . 6 loops are formed, in which by inserting lamellae, in particular Lichtlenklamellen 7 , to be ordered. Such Lichtlenklamellen are also already known from the prior art, for example from the above DE 102 60 711 A1 so that a further discussion of the same at this point is unnecessary. It should be noted, however, that these Lichtlenklamellen 7 usually in the slat sheet a Kantung 8th have, so that incident light from the front leaf blade part 9 , the front longitudinal band 2 is assigned, is reflected in the closed position of the fins to the outside, whereas light from a rear lamellar sheet part 10 , the rear longitudinal band 3 is reflected towards a ceiling of a room. There are in the prior art most different embodiment of such Lichtlenklamellen 7 known with or without coating, wherein for the invention all of these types of Lichtlenklamellen 7 can be used. In principle, it is also possible, normal lamellar leaves without edging 8th in a ladder cord according to the invention 11 passing through the longitudinal bands 2 . 3 and the crossbars 4 is formed to use.

Depending on the height of the window or the door height, the external blinds are included 1 or Venetian blind a corresponding number of Lichtlenklamellen 7 on top of each other and are accordingly in the ladder cord 11 a number of transverse webs adapted to this number 4 educated.

The crossbars 4 are spaced apart in the vertical direction, as is also known from the prior art. According to the invention, however, it is provided that a distance 12 between two directly superimposed transverse webs 4 at the front, vertical longitudinal band 2 (in 1 denoted by A) is greater than a distance 13 between these two directly superimposed transverse webs 4 at the rear, vertical longitudinal band 3 (in 1 B denotes). It is thus achieved that the Lichtlenklamellen 7 or generally the lamellar leaves over a height of the external blinds 1 are differently inclined in the vertical direction with respect to the horizontal, wherein the respective lower blade leaf, that is, the respective lower Lichtlenklamelle 7 , which has the largest inclination and the upper leaf or the uppermost Lichtlenklamelle 7 includes an angle with the horizontal that is the lowest of all Lichtlenklamellen 7 ,

The difference of the distances 12 and 13 between two directly superimposed transverse webs 4 can be between 0.5 mm and 5 mm, which means that the distance 13 0.5 mm to 5 mm smaller than the distance 12 , For example, a difference of at least approximately 2 mm per field is set.

In the preferred embodiment, the ladder cord is over the entire height 11 the distances 12 between two transverse webs on the front longitudinal band 2 each the same size, as well as the distances 13 at the rear longitudinal band 3 So, so the respective distances 12 . 13 about the height of the external venetian blind 1 or the ladder cord 11 are constant. The size of the distances 12 or the distances 13 also depends on the width of the Lichtlenklamellen 7 as is common practice.

2 shows a device 14 for the production of the ladder cord 11 in a very schematically simplified representation. With the exception of a two-part roller 15 or spindle corresponds to the device shown 14 over a wide range of the prior art for the production of a ladder cord. This device 14 essentially comprises a plurality of holding devices 16 for bobbins, one of which is yarn 17 unwound and a weaving facility 18 (or a crochet device or a braiding device), which in 2 is indicated only schematically, are supplied, wherein a plurality of yarns 17 the ladder cord 11 woven (or crocheted or braided) becomes. After leaving the weaving device 18 becomes the ladder cord 11 a roller mill 19 fed to the several rollers 20 having. These are in 2 only two pairs of rollers shown, of course, this roller chair 19 also more pairs of rollers or rollers 20 as shown. With this roller chair 19 Among other things, it also achieves that on the ladder cord 11 is constantly applied under tension to produce distortions and uncontrolled distortions in the longitudinal straps 2 . 3 the ladder cord 11 to avoid.

In the direction of production of the ladder cord 11 the roller chair 19 downstream is a fixing device 21 for thermal fixation of the ladder cord 11 , wherein this fixing device 21 is designed for the emission of radiation or heat or for the delivery of hot air. It is also possible to carry out the thermal fixation by means of contact fixation. In this case, the fixing device 21 can account for at least one of the rollers 20 of the roll mill 19 be kept at the elevated fixing temperature.

The finished ladder cord 11 will eventually be on the roller 15 wound. According to the invention, it is provided that this roller 15 or spindle is at least two parts, with a first part roller 22 for the front, first longitudinal band 2 the ladder cord 11 and a second sub-roller 23 or partial spindle for the second, rear longitudinal band 3 , These two sub-rollers 22 . 23 can be arranged in each case on their own waves or a common shaft, these two sub-rollers 22 . 23 operated at different speeds and / or these have a different diameter 24 . 25 in order to ensure uniform winding of the conductor cord 11 despite different distances 12 . 13 between two transverse webs 4 on the front longitudinal band 2 or at the rear longitudinal band 3 to reach.

It is with this device 14 possible, the ladder cord 11 from the same yarns 17 so that no different materials must be used.

According to another variant for the production of the ladder cord 11 is provided that for the front, vertical longitudinal band 2 and the rear, vertical longitudinal band 3 the ladder cord 11 each different threads or yarns 17 be used, these threads or yarns 17 differ in their thermal shrinkage. The thermal shrinkage is defined as hot air shrinkage according to DIN 53866-3 (160 ° C, 15 min.).

There is the possibility that the rear longitudinal band 3 entirely from yarns 17 produced, which have a greater thermal shrinkage than the front longitudinal belt 2 , In an alternative embodiment, there is the possibility that only a part of the yarns 17 for the rear and possibly the front longitudinal band 2 . 3 through yarns 17 replaced, which have a greater thermal shrinkage, so so the two longitudinal bands 2 . 3 consist of a mix of materials. If also in the front longitudinal band 2 yarns 17 are used, which have the greater thermal shrinkage is provided according to the invention that the number of threads or yarns 17 in the rear longitudinal band 3 , which have the greater thermal shrinkage, is greater than in the front longitudinal band 2 so that, despite the use of yarns 17 different thermal shrinkage in the front and rear longitudinal band 2 . 3 the distances 12 . 13 are different after the thermal fixation, ie the distance 13 at the rear longitudinal band 3 between two transverse webs is smaller than the distance 12 between two transverse webs on the front longitudinal band 2 ,

There is also the possibility that, although for the front longitudinal band 2 also threads or yarns 17 be used with a different thermal shrinkage behavior, however, the threads or yarns 17 with the larger thermal shrinkage in the front longitudinal band 2 have a lower thermal shrinkage than those threads or yarns 17 with the greater thermal shrinkage in the rear longitudinal band 3 so that essentially three different yarns with different thermal shrinkage behavior are processed.

As threads or yarns 17 with the greater thermal shrinkage can threads or yarns 17 of polyamide, in particular an aromatic polyamide, for example a mixture of m-aramid and p-aramid fibers, wherein the p-aramid fiber content predominates, or p-aramid fibers, polyethylene, polypropylene, polyvinyl alcohol. Be used. In particular, these threads or yarns 17 a thermal shrinkage value of at least 6%. The yarns 17 or threads with the lower thermal shrinkage can be selected from a group comprising polyester threads, polyparaphenylene-terephthalamide copolymer threads, polyamide threads, phenol-aldehyde resin threads, polyimide threads, polyether etherketone threads. According to a preferred embodiment, the ladder cord 11 from a fabric of polyester threads or polyester yarns and threads or yarns 17 made of one, in particular aromatic, polyamide.

It is preferred that the values of thermal shrinkage between the yarns 17 with the greater thermal shrinkage and those with the lower thermal shrinkage by at least 15%, preferably at least 25%, in particular at least 40%.

In principle, there is the possibility that those threads or yarns 17 with the greater thermal shrinkage both as warp threads and as weft threads or only as warp threads or only as weft threads, the latter variant being the preferred one.

There is also the possibility that the fabric or the crochet or the braid is designed such that the thread or the threads or the yarn 17 or the yarns 17 with the greater thermal shrinkage in the core of the longitudinal strip (s) 2 . 3 is arranged or are, so of threads or yarns 17 are surrounded at least partially with lower thermal shrinkage.

As already stated above, it can further be provided that at least the first, front longitudinal band at least partially made of threads or yarns 17 made of a UV-resistant material or are UV-resistant equipped. For example, these threads or yarns 17 be made of a technical acrylic.

To a different shrinkage behavior between the front longitudinal band 2 and the rear longitudinal band 3 to achieve during the thermal fixation and not only when threads or yarns 17 are used with different thermal shrinkage, it is within the scope of the invention, the possibility that the rear longitudinal band 3 from threads or yarns 17 is made, which have a different cross-section, in particular a larger diameter and / or a different cross-sectional shape, than the threads or yarns 17 , which for the front longitudinal band 2 be used. Of course, in this embodiment, there is the possibility that both for the front longitudinal band 2 as well as the rear longitudinal band 3 Threads or yarns 17 be used, which differ in their cross-section, that is, in their cross-sectional shape or their diameter, in which case, in turn, the number of these threads or yarns 17 in the two longitudinal bands 2 . 3 is different, especially in the second, rear longitudinal band 3 a higher number of such threads or yarns 17 is included compared to the number of these threads or yarns 17 in the first, front longitudinal band 2 ,

Furthermore, there is the possibility of threads or yarns for the same reason 17 to use, which differ in their dtex value, preferably yarns 17 with higher dtex value for the rear longitudinal band 3 be used. Again, there is the possibility of a mixture, that is, both for the front longitudinal band 2 as well as for the rear longitudinal band 3 Threads or yarns 17 be used with different dtex value, wherein the proportion of threads or yarns 17 on the front longitudinal band 2 with the higher dtex value is smaller than that in the rear longitudinal band 3 ,

There is also the possibility that threads or yarns 17 be processed with different elasticity, especially for the rear longitudinal band 3 Threads or yarns 17 used, which have a lower elasticity than the threads or yarns 17 for the front longitudinal band 2 , In particular, this elasticity may differ by an amount of 20%. Again, mixed forms, as described above, are possible.

Finally, there is still the possibility that in general the number of the front longitudinal band 2 and the rear longitudinal band 3 used yarns 17 or threads is different, especially for the front longitudinal band 2 a higher number of threads or yarns 17 is used, which also has a different thermal shrinkage behavior between the two longitudinal bands 2 . 3 can be achieved during the thermal fixation, even if the threads or yarns used 17 have no different, thermal shrinkage behavior. For example, for the front longitudinal band 2 a number of 6 and for the rear longitudinal band 3 a number of 8 yarns 17 be used.

It should be mentioned at this point that in the context of the invention, mixed forms are possible, so that yarns 17 or threads are used, which differ both in terms of their thermal shrinkage and / or in terms of their cross-section and / or in terms of their dtex value or subsequently, a combination can be used with a different number of threads for the front longitudinal band 2 and the rear longitudinal band 3 in connection with a different cross section and / or dtex value and / or a different, thermal shrinkage and / or a different elasticity.

Furthermore, there is the possibility during the thermal fixation of the conductor cord 11 apply two different temperatures, for example, for the thermal fixation of the front longitudinal band 2 a temperature which is at least 30% lower than the temperature with which the rear longitudinal band 3 thermally fixed. In this case, it is possible, if not hot air for thermal fixation or heat radiation is used, but the thermal Fixation by contact fixing by means of at least one roller 20 done that at least one roller 20 at least divided into two parts and these two parts of the roll are kept at a different temperature level.

With at least two parts within the scope of the invention concerning the rolls 15 . 20 is meant that a higher pitch is also possible, if on a roller 15 . 20 several conductor bands 11 be processed side by side.

There are also other production possibilities of the conductor cord according to the invention 11 , For example, the first, front longitudinal band 2 compared to the second, rear longitudinal band 3 be exposed during production to a greater tensile load, so that between the transverse webs 4 on the first, front longitudinal band 2 a greater distance 12 is achieved compared to the distance 13 between two transverse webs 4 at the second, rear longitudinal band 3 , By a final thermal fixation of the fabric of the ladder cord 11 or the crocheted or braided ladder cord 11 This state can be "frozen". It is also possible here with at least two-part rolls 20 to work to enable the different pulling forces.

The embodiments show possible embodiments of external venetian blinds 1 or the ladder cord 11 or the device 14 , It should be noted at this point that the invention is not limited to the specifically illustrated embodiments thereof, but rather also various combinations of the individual embodiments are possible with each other and this possibility of variation due to the teaching of technical action by objective invention in the ability of this on this technical Area professional. Thus, within the scope of the claims, embodiments are also included, which are possible by combinations of individual details of the illustrated and described embodiments.

For the sake of order, it should be pointed out that for a better understanding of the structure of the external blinds 1 or the ladder cord 11 or the device 14 these or their components have been partially displayed off-scale and / or enlarged and / or reduced.

LIST OF REFERENCE NUMBERS

1

External Blinds

2

longitudinal ligament

3

longitudinal ligament

4

crosspiece

5

transverse

6

transverse

7

Light louver

8th

Tilting

9

Fin blade part

10

Fin blade part

11

ladder cord

12

distance

13

distance

14

contraption

15

roller

16

holder

17

yarn

18

weaving means

19

roll mill

20

roller

21

fixing

22

partial roll

23

partial roll

24

diameter

25

diameter

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 10260711 A1 [0002, 0033]
• US 6227279 B [0003]
• EP 1508664 A1 [0003]
• US 2002/038694 A1 [0004]
• EP 0609541 A1 [0005]
• DE 29512108 U1 [0006]
• DE 20217300 U1 [0006]
• DE 2111237 C [0007]

Cited non-patent literature

• DIN 53866-3 [0042]

Claims (18)

Ladder cord ( 11 ) for a venetian blind ( 1 ) or a Venetian blind consisting of a first, front, in particular woven, crocheted or braided, longitudinal band ( 2 ) and one, arranged in a horizontal distance therefrom and with this over a plurality of transverse webs ( 4 ), second, rear, in particular woven, crocheted or braided, longitudinal band ( 3 ), wherein the transverse webs ( 4 ) in the direction of the longitudinal bands ( 2 . 3 ) are arranged at a vertical distance from each other and from two transverse bands ( 5 . 6 ), each in pairs at least approximately at the same level of the longitudinal bands ( 2 . 3 ), characterized in that a vertical distance ( 12 ) between each two transverse webs ( 4 ) at the first, front longitudinal band ( 2 ) is permanently greater than a vertical distance ( 13 ) between each two transverse webs ( 4 ) on the second, rear longitudinal band ( 3 ). Ladder cord ( 11 ) according to claim 1, characterized in that the vertical distances ( 12 . 13 ) between each 2 transverse webs ( 4 ) at the first, front longitudinal band ( 2 ) and at the second, rear longitudinal band ( 3 ) are constant over a conductor cord length. Ladder cord ( 11 ) according to claim 1 or 2, characterized in that the second, rear longitudinal band ( 3 ) at least two different threads or yarns ( 17 ), which differ in the thermal shrinkage, or that the second, rear longitudinal band ( 3 ) of threads or yarns ( 17 ), which have a greater thermal shrinkage than the threads or yarns ( 17 ) from which the first, front longitudinal band ( 2 ) is made. Ladder cord ( 11 ) according to claim 3, characterized in that the first, front longitudinal band ( 2 ) also at least two different threads or yarns ( 17 ), which differ in thermal shrinkage, the number of threads or yarns ( 17 ) with the greater thermal shrinkage in the second, rear longitudinal band ( 3 ) is larger than in the first, front longitudinal band ( 2 ). Ladder cord ( 11 ) according to claim 3 or 4, characterized in that the thread or the threads or the yarn ( 17 ) or the yarns ( 17 ) form the weft threads of the fabric with the greater thermal shrinkage. Ladder cord ( 11 ) according to one of claims 3 to 5, characterized in that the thread (s) or yarn (s) ( 17 ) or the yarns ( 17 ) is arranged with the greater thermal shrinkage in the core of the longitudinal bands or are. Ladder cord ( 11 ) according to one of claims 3 to 6, characterized in that the thread or the threads or the yarn ( 17 ) or the yarns ( 17 ) with the greater thermal shrinkage of at least one of the conductor strips ( 2 . 3 ) have at least 15% greater thermal shrinkage than the thread or threads or yarn ( 17 ) or the yarns ( 17 ) with the lower thermal shrinkage. Ladder cord ( 11 ) according to one of claims 3 to 7, characterized in that the thread or the threads or the yarn ( 17 ) or the yarns ( 17 ) having or having a thermal shrinkage value of at least 6% with the greater thermal shrinkage. Ladder cord ( 11 ) according to one of claims 3 to 8, characterized in that the longitudinal strips ( 2 . 3 ) are made of a fabric of polyester threads and threads of one, in particular aromatic, polyamide or are made. Ladder cord ( 11 ) according to one of claims 1 to 9, characterized in that at least the first, front longitudinal band ( 2 ) at least partially made of threads or yarns ( 17 ) are made of a UV-resistant material or with a UV-resistant equipment. Ladder cord ( 11 ) according to one of claims 1 to 10, characterized in that the second, rear longitudinal band ( 3 ) of at least two threads or yarns ( 17 ), which have a different cross-section or that the first, front longitudinal band ( 2 ) of threads or yarns ( 17 ) which is one of the threads or yarns ( 17 ) of the rear, second longitudinal band ( 3 ) have different cross-section. Ladder cord ( 11 ) according to one of claims 1 to 11, characterized in that the second, rear longitudinal band ( 3 ) Threads or yarns ( 17 ), which have a greater dtex value than the threads or yarns ( 17 ) of the first, front longitudinal band ( 2 ). Ladder cord ( 11 ) according to one of claims 1 to 12, characterized in that the second, rear longitudinal band ( 3 ) Threads or yarns ( 17 ), which have a lower elasticity than the threads or yarns ( 17 ) of the first, front longitudinal band ( 2 ). Ladder cord ( 11 ) according to one of claims 1 to 13, characterized in that the number of threads or yarns ( 17 ) of the first, front longitudinal band ( 2 ) is different from the number of threads or yarns ( 17 ) of the second, rear longitudinal band ( 3 ). Ladder cord ( 11 ) according to one of claims 3 to 14, characterized in that the longitudinal strips ( 2 . 3 ) are thermally treated. Ladder cord ( 11 ) Claim 15, characterized in that the first, front longitudinal band ( 2 ) is thermally treated at a lower temperature than the second, rear longitudinal band ( 3 ). External blinds ( 1 ) or Venetian blind comprising a plurality of Lichtlenklamellen ( 7 ) which are arranged on straps, characterized in that the straps by ladder cords ( 11 ) are formed according to one of claims 1 to 16. Contraption ( 14 ) for producing a ladder cord ( 11 ) for an external venetian blind ( 1 ) or a Venetian blind, whereby the ladder cord ( 11 ) from a first, front, in particular woven, longitudinal band ( 2 ) and one, arranged in a horizontal distance therefrom and with this over a plurality of transverse webs ( 4 ) connected second, rear, in particular woven, longitudinal band ( 3 ), wherein the transverse webs ( 4 ) in the direction of the longitudinal bands ( 2 . 3 ) are arranged at a vertical distance from each other and from two transverse bands ( 5 . 6 ), each in pairs at least approximately at the same level of the longitudinal bands ( 2 . 3 ), the device ( 14 ) several holder devices ( 16 ) for yarn packages and in the production direction these at least one spool or a roller ( 15 ) on which the finished ladder cord ( 11 ) is wound, characterized in that the coil or roller ( 15 ) is at least two parts, with a first part coil or part roller ( 22 ) for the first, front longitudinal band ( 2 ) and a second sub-coil or sub-roll ( 23 ) for the second, rear longitudinal band ( 3 ), wherein the two partial coils or partial rollers ( 22 . 23 ) are drivable at a different speed and / or have a different diameter.

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