摘要:
A leno cloth is prepared, which comprises at least ground warp threads 1, leno warp threads 3 and weft threads 2, and in which the weft threads 2 and the ground warp threads 1 are arranged essentially interspace free. The weft threads are bound-off by means of the leno warp threads 3, which comprise a clearly lower titer relative to the ground warp threads 1, with such a lower tension relative to the ground warp threads, so that the crossings of the leno warp threads 3 with the ground warp threads 1 that are present due to the binding are arranged in a plane parallel to the plane of the maximum thickness of the weft threads. The leno warp threads 3 comprise a higher working-in or take-up into the woven cloth than the ground warp threads 1. According to a further aspect of the invention, a method for the production of a leno cloth as well as a loom for the carrying out of the method for the production of a leno cloth are described.
摘要:
A leno cloth is prepared, which comprises at least ground warp threads 1, leno warp threads 3 and weft threads 2, and in which the weft threads 2 and the ground warp threads 1 are arranged essentially interspace free. The weft threads are bound-off by means of the leno warp threads 3, which comprise a clearly lower titer relative to the ground warp threads 1, with such a lower tension relative to the ground warp threads, so that the crossings of the leno warp threads 3 with the ground warp threads 1 that are present due to the binding are arranged in a plane parallel to the plane of the maximum thickness of the weft threads. The leno warp threads 3 comprise a higher working-in or take-up into the woven cloth than the ground warp threads 1. According to a further aspect of the invention, a method for the production of a leno cloth as well as a loom for the carrying out of the method for the production of a leno cloth are described.
摘要:
A pile warp tension control method uses a pile warp tension control device capable of adjusting the tension of pile warp yarns according to a weave on a pile fabric loom. The pile warp tension control method involves setting a first pile warp tension amount for a pile weave section weaving mode for use in weaving a pile weave section, and setting second pile warp tension amounts for ground weave section weaving modes, respectively, for use in weaving ground weave sections, where the second pile warp tension amounts are higher than the first pile warp tension amounts. The control method further involves gradually increasing the tension of the pile warp yams from the first pile warp tension amount toward a selected one of the second pile warp tension amounts in a predetermined period after the change of the operating mode of the pile fabric loom from the pile weave section weaving mode to the ground weave section weaving mode. The control method next involves adjusting the tension of the pile warp yarns to the selected second pile warp tension amount after the end of the predetermined period.
摘要:
An arrangement for driving a warp beam employs a stepless adjustable drive (7) whose coupling element (8) is displaced by a setting member (11). The setting member (11) is controlled-by a computer (10) which provides an input arrangement (17) for the take-up of data of a predetermined thread provision (F); as well as data on the machine, the stepless adjustable drive (7) and the beam (3). The data includes a wind variable size (actual wind number w.sub.a), and data characterizing the actual wind circumference (U.sub.a). The computer has a calculating segment (18) and an output (19). With such an arrangement, the coupling element (8) can be brought into the correct target position, even before the start of the machine. The computing means can also serve as part of the control arrangement during the running of the machine.
摘要:
A take-up rate and a let-off rate in warp feed on a loom are controlled while a displacement (.DELTA.L) of a cloth fell position C is taken into account. The system comprises a cloth fell position compensation circuit (2, 16, 21) which outputs a cloth fell compensation signal (.DELTA..omega..sub.c) to compenate a displacement (.DELTA.L) of the cloth fell position (C) when a weaving condition such as a target weft density (D*), a target warp tension (T*) or the kinds of weft and warp yarns is changed. The cloth fell compensation signal is added to a basic warp feed rate (.omega..sub.f) obtained from D*, so that the displacement motion of the cloth fell is completed in a shorter time. According to this compensation, a weft density of a resultant fabric rapidly coincides with the target weft density.
摘要:
A constant tension regulator for controlling the tension of positively unwound flexible material, particularly warp threads in a weaving machine. Means are operatively mounted on the frame of the regulator for sensing changes in tension in the unwinding flexible material. These sensing means output a control movement in accordance with sensed tension in the unwinding flexible material which is translated to a mechanical integrating unit and a proportional adjusting unit, arranged in parallel, which jointly transmit a control variable adjustment to the driving means of the warp beam thereby adjusting its rotary speed in accordance with the sensed tension.
摘要:
A quasi-isotropic three-dimensional preform and a method of making thereof are disclosed. The preform includes a plurality of woven elements that are braided with each other. The woven elements have one or more integrally woven stiffeners or walls in a direction perpendicular to the plane of the woven element. The preform may be used in forming a fiber reinforced composite.
摘要:
Novel woven materials, producible by a new weaving method, are described that comprise single or doubled warps and wefts in the form of tapes that are preferably partially stabilized type of fibrous tape. These fibres are caused to occur in a non-linear arrangement during the weaving process. The non-linear fibres can be subsequently straightened by pulling the tape longitudinally. The doubled warps and wefts comprise disconnected tapes. Such separateness of constituent tapes of doubled warp and weft tapes enables them to be slid/slipped relative to each other by pulling longitudinally and laterally without causing any alteration in the woven structure. These novel fabrics solve the problem of uneven fibre distribution and orientation arising from crumples/wrinkles due to compression and stretches due to extension, at the inner and outer sides respectively, when tape-woven fabrics are curved into shapes. Further, by using doubled warps and wefts fabrics with relatively flat/planar sections and thicker/raised wide rib sections can be also created that resemble a bit like a profiled material in its cross-section. Other fabrics like those comprising slant/oblique weft tapes, shaped warp and weft tapes, formed shape within its body are also producible.
摘要:
A novel method of weaving is described wherein warp and weft are supplied in the form of tapes, and not yarns. In at least one embodiment, the method, which is preferably carried out in vertical format, essentially includes feeding positively flat tensionless warp for shedding and taking-up; selecting, feeding positively and inserting weft tapes of different widths and thickness by gripping in its fore end in flat condition; depositing inserted weft at fabric-fell in a flat condition without beating-up; and taking-up the woven material that comprises either same or different widths of flat wefts. The warps and wefts, preferably of partially stabilized type of fibrous tapes, can be overfed in a tensionless, positive and controlled manner when required to make the fibres of constituent fibrous tapes occur non-linearly in the form of wave/texture during weaving. Extra warps and wefts can be also fed in tandem whereby the warps and wefts become composed of two or more unconnected, mutually slipping, flat tapes in a stacked arrangement. These doubled warps and wefts function effectively as a unit warp and weft during weaving and in the fabric. In at least one embodiment, the method also makes possible to produce other materials such as those with slant weft tapes in relation to warp, having a shape within the body of the fabric and warp and weft tapes of shaped edges. A variety of fibrous and non-fibrous materials are equally well processed.