Patent Application
20200208310
The invention relates to an apparatus for drawing-off a web-shaped product from a weaving machine.
Apparatuses for drawing-off web-shaped products from weaving machines are known. They are always utilized when web-shaped products, especially woven webs, are produced continuously or section-wise, whereby the produced web-shaped products after being drawn-off from the weaving machine are wound-up or rolled-up, in order to supply them to a further processing or treatment process.
An apparatus for producing and for drawing-off a web-shaped product is known from DE 10 2015 222 142 B3. Two clamp carriers with clamps serve for drawing-off the web-shaped product from the weaving machine, wherein moreover drive means are provided, by which the clamp carriers are driven back and forth in the drawing-off direction of the web-shaped product. Drawing-off the web-shaped product is achieved through the back and forth motion of the clamp carriers in connection with the controlled opening and closing of the clamps, wherein a tensile stress or tensioning is applied to the web-shaped product with the clamps through an actuation of the drive means for the clamp carriers. According to this known apparatus, the web-shaped product is produced with main sections and auxiliary sections. The auxiliary sections serve so that the clamps grasp the web-shaped product at these sections, that is to say an opening and a closing of the clamps are carried out only in the time segments of producing the web-shaped product in which an auxiliary section for holding the web-shaped product is being produced.
The object underlying the invention is now directed to producing an apparatus for drawing-off a web-shaped product from a weaving machine, which is utilizable for thick wares, especially for so-called 3D-wares for example for multi-layered woven webs or fabrics, whereby by means of this apparatus a sagging of the finished produced section of the web-shaped product shall be minimized or entirely avoided.
This object is achieved by an apparatus for drawing-off a web-shaped product from a weaving machine with the features according to claim 1. Advantageous further developments are defined in the dependent claims.
The apparatus according to the invention for drawing-off a web-shaped product from a weaving machine comprises at least one clamp carrier, which comprises clamps for the web-shaped product, a carrier frame apparatus, on which the clamp carrier is guided, and a drive means through which the clamp carrier is drivable back and forth in a motion range in the drawing-off direction of the web-shaped product from the weaving machine. In that regard, the drawing-off preferably is achieved horizontally. In the scope of this invention, the term “web-shaped product” is to be understood as covering especially three-dimensionally embodied web-shaped products, which preferably involve multi-layered woven webs or fabrics. According to the invention, the clamp carrier is embodied so that it can clampingly hold the web-shaped product within the motion range of the clamp carrier. According to the invention, a support system for the web-shaped product is provided at least between an apparatus side that faces toward the weaving machine, and the clamp carrier within the carrier frame apparatus. Therewith, an impermissibly large sagging between the apparatus side and the clamp carrier is avoided. The web-shaped product is graspable by the clamp carrier on the weaving machine, and is guidable in its drawing-off direction essentially at the production speed. Above all, the support system serves to be able to draw-off thick yet to some extent flexible web-shaped products from the weaving machine, without allowing its sagging in the apparatus for drawing-off the web-shaped product. Namely, for three-dimensional, for example multi-layered, embodied web-shaped products, the danger exists that due to the self-weight an impermissibly large sagging arises, through which the inner structures of the three-dimensional embodied web-shaped product are deformed, which results in a loss of quality.
By the support system, the web-shaped product is supported so that in any case only a small sagging of the product is present. Here, products with a thickness of approximately 6 to 20 mm or as the case may be even in the range from 40 to 100 mm or more are referred to as very thick or also multi-layered web-shaped products. Such three-dimensionally embodied web-shaped products can no longer be wound or wrapped up on a cloth beam or a winding take-up roller. Thereby this three-dimensionally embodied web-shaped product would be damaged and deformed in its inner structure. Therefore, very thick web-shaped products generally must be drawn-off horizontally out of the weaving machine, namely in the warp direction, so that the individual layers or the individual threads forming the three-dimensional structure are not shifted or deformed. Depending on the application or utilization, the product sections to be held and to be supported within the apparatus can be relatively long, so that the avoidance of the sagging is of utmost importance.
The possibly arising sagging of the web-shaped product section is dependent on the width of the apparatus, that is to say on the width of the carrier frame apparatus, on the tensile stress of the clamp carrier, which pulls-in the product section from the weaving machine into the apparatus for the drawing-off, on the length of the produced section, and on the weight per unit area of the web-shaped product. It has now been shown that the product section can be held, by the support system according to the invention, in such a planar manner in the apparatus so that the woven web quality in the width direction and the longitudinal direction is not impaired by an impermissibly large sagging.
Preferably still a second clamp carrier is provided between the side of the apparatus that faces away from the weaving machine, and the first clamp carrier. The web-shaped product is held in a clamped manner at least temporarily by the first and by the second clamp carrier. That means that the web-shaped product is clampingly held at its leading end, and is at least temporarily similarly clampingly held at its trailing end which faces toward the apparatus side of the weaving machine.
Preferably the support system is embodied in the form of tension cables or stiff-backed chains, or tension cables and stiff-backed chains in combination. In that regard, the support system is movable in the drawing-off direction at a speed corresponding to the production speed of the web-shaped product. In that the support system is movable at a speed corresponding to the production speed of the product section, it is ensured that undesired friction that possibly could damage the product does not arise on the support system.
According to a further development of the invention, the first or as the case may be, the second clamp carrier drives the tension cables and/or the stiff-backed chains, whereby preferably the tension cables are windable into a cable winder or the stiff-backed chains are slidable into a chain storage unit, or can be pulled out of these. The cable winder and/or the chain storage unit serve to wind up the support system during the back and forth motion of the clamp carrier or carriers, or to unwind it from such a storage unit. The advantage of working with a winding-up or unwinding storage unit exists in that, among other things, the working length of the apparatus is easily adaptable to changed desired lengths of a product section.
The term “stiff-backed chains” or also so-called thrust chains is understood to cover such chains that consist of several chain links arranged one after another and connected by chain pins or bolts, which are embodied so that a bending or kinking of the chain links about the axis of the chain pins is possible in one direction, but in the other direction a kinking beyond a straight arrangement of the chain links is blocked. Example embodiments of such chains can be seen e.g. in the EP 1744079 A1, the DE 20209957 U1 or DE 10137939 A1. Thus, these chains can be pushed in the production direction as a support under the product, without departing from their support plane serving for the support of the product sections.
Preferably the tension cables or the stiff-backed chains are movable in the longitudinal direction of the product section and parallel to one another. That means, that over the width of the carrier frame apparatus, within which the product section is guided by means of the clamp carriers, the tension side and/or the stiff-backed chains are arranged next to one another in such a manner so that a support or contact surface plane is formed, namely the support plane, which guarantees a uniform supporting of the product section, so that this is guidable within the apparatus largely free of sagging, and namely free of sagging especially in the longitudinal direction which corresponds to the drawing-off direction.
The support system with at least two stiff-backed chains, of which the motion is synchronized among one another, is provided preferably in the area between the apparatus side that faces toward the weaving machine, and the first or—if present—the second clamp carrier. The provision of only two stiff-backed chains is above all expedient or suitable when on the one hand the cost, effort or complexity for the support system is to be maintained within limits, but on the other hand, the product section comprises a certain self-stiffness, so that the product section does not or at least does not significantly sag between the two stiff-backed chains in which a direct support of the woven web section is not given.
Preferably each clamp carrier is provided with respectively one upper and one lower clamp bar as a clamp, which are mounted on clamp bar bodies within the clamp carrier, whereby the tension cables and/or the stiff-backed chains or the thrust chains are guided through openings in the respective lower clamp bar bodies. In that regard it is expedient or suitable that the openings comprise such a size that a necessary clamp stroke or travel of the respective lower clamp bar for a clamping of the product section can be carried out without the tension cables and/or the stiff-backed chains being deflected out of their support plane.
Instead of clamp bars, in principle hook- or needle-shaped elements can be utilized in order to fix the web-shaped product on the clamp carriers. Thus, for example, bars with hook-shaped elements mounted thereon or with needles can be mounted on the upper and/or lower clamp carriers. When carrying out the vertical clamping stroke, the hooks or needles submerge or penetrate into the web-shaped product. In order to avoid damaging the ground material, in these cases it is necessary to provide the web-shaped product with auxiliary sections at certain spacing distances, which auxiliary sections are later cut off.
According to a further example embodiment, the tension cables and/or the stiff-backed chains are embodied as endless elements. In such a case, the previously mentioned winding-up devices or unwinding devices are omitted. Instead, deflecting elements—for example cable rollers or chain wheels—are provided, in order to deflect the tension cables or chains out of the drawing-off direction into the opposite direction within the apparatus. This leads to a structurally simplified embodiment, which can be expedient or suitable for an always constant length of the product sections to be produced.
Further preferably, the tension cables and/or stiff-backed chains are able to be wound-up and unwound are with the motion of the first or, as the case may be, the second clamp carrier in the a drawing-off direction of the web-shaped product. For that, a winding-up or unwinding unit is integrated in the respective clamp carrier, so that this or the entire apparatus can be embodied in a compact manner.
Further preferably the support system comprises a lifting table arranged within the carrier frame apparatus, which is transportable from a retracted position into a support position that supports the product section on its underside and essentially avoids its sagging. A lifting table system consisting of several lifting tables can also be provided.
In a further embodiment of the invention, the support system, which supports the web-shaped product on its underside between the first or if applicable the second clamp carrier and the weaving machine, comprises a scissors rod linkage system with e.g. carrier rolls, slide rails, slide sheets, tension cables. The advantage of such a scissors rod linkage system exists above all in that the support length for the product section to be supported in the apparatus is relatively easily adaptable to different lengths of the product section.
The carrier rolls, slide rails, slide sheets or tension cables are arranged in the scissors rod linkage system in such a manner so that their respective surfaces that face in the direction toward the product section to be supported form the support plane. The scissors rod linkage system is transportable from its extended, stretched condition into its retracted “crushed or compressed” condition in a length ratio of preferably approximately 3:1. With a length of the apparatus of preferably 6 m, the crushed or compressed length amounts to approximately 2 m. In order to keep the woven web waste small, therefore it can further be provided that the scissors rod linkage system is transportable downwardly into an area below the clamp carrier, which is especially realizable by means of a guide rail in the manner of a sliding block guide.
Further advantages, embodiments and details of the present invention will now be described in connection with the figures according to several example embodiments.
In the drawings, it is shown by:
In a side view in a principle or schematic illustration,
A perspective view of a first embodiment of the apparatus according to the invention is illustrated in
A chain storage unit 9 is allocated to the second clamp carrier 2, and the clamp carriers are provided to grasp and to clamp the web-shaped product and to move it at the production speed within the apparatus to its drawing-off. The supporting length of the support system 5 corresponds to the length of the produced web-shaped product up to the second clamp carrier 2; the rest of the support system is in the storage unit, in the embodiment illustrated here it is wound up as a stiff-backed chain 7 in the chain storage unit 9 Thereby, the rear portion of the apparatus, in
When the web-shaped product 20 is produced by the weaving machine, the second clamp carrier 2 grasps or clamps the front leading edge of the web-shaped product and moves the same in a clamping manner at the production speed for the web-shaped product over the desired length of the section to be produced. During the drawing-off, the produced web-shaped product 20 is supported essentially free of sagging on the stiff-backed chains 7. After the produced length of a first section of the web-shaped product 20 is reached, the first clamp carrier 1 grasps the forward edge of the next produced web-shaped product section and maintains the tension between the drawing-off apparatus and the weaving machine. After grasping the web-shaped product section by the first clamp carrier, the clamp of the second clamp carrier 2 can be opened. Next, the second clamp carrier 2 moves back out of the rear region of the drawing-off apparatus, and the produced web-shaped product section can be removed out of the apparatus by the operator. The stiff-backed chains 7 are guided through openings 13 in the clamp carrier 1 and 2. They are again wound up in the chain storage units 9 when the second clamp carrier moves out of the rear region or area of the drawing-off apparatus according to the invention in the direction toward the weaving machine.
As soon as the opened second clamp carrier 2, on its way counter to the drawing-off direction 8, has reached the first clamp carrier 1, the product section grasped by the first clamp carrier is transferred to the second clamp carrier by corresponding control of the clamps and of the drives, and the above described process begins anew.
A perspective detail view of an upper clamp bar 10 and a lower clamp bar 11, respectively for the first clamp carrier 1 and the second clamp carrier 2, is shown in
A principle or schematic view in the direction of the take-down or drawing-off, that is to say in the longitudinal direction of the apparatus for drawing-off the web-shaped product, is illustrated in
A further detail view of the clamp region or area of the first clamp carrier 1 and the second clamp carrier 2 is illustrated in a perspective illustration in
A further example embodiment is illustrated in
A further example embodiment according to the invention is illustrated in
The example embodiment according to
The thrust chains and respectively two carrier rolls 21 are shown in a once-again enlarged illustration in
These thrust chains form a corresponding support region for the produced web-shaped product 20. At one end, these stiff-backed chains 7 are guidable into their respective allocated chain storage unit 9. Upon shortening the required support length, the stiff-backed chain 7 is transported or fed into the chain storage unit 9 and wound-up or rolled-up there. In contrast, upon lengthening the required support region, the chain is unwound out of the chain storage unit 9. If the web-shaped product is to be produced in a larger length, it is certainly expedient or suitable to provide the stiff-backed chains 7 as the support system with a slight curvature or camber toward the top, so that under loading with resting contact of the web-shaped product thereon, the stiff-backed chains is deformed into an essentially planar so-called null position.
Still a further example embodiment is illustrated in
The apparatus for drawing-off a web-shaped product of three-dimensional type is illustrated in
In
The first clamp carrier 1, which comprises an upper clamp bar 10 divided into individual segments and a lower clamp bar 11 similarly divided into individual segments, is shown in
The same side view of the apparatus according to the invention as in
In
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2017 213 255.8 | Aug 2017 | DE | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2018/068756 | 7/11/2018 | WO | 00 |
