JP6256350B2 - Loom and woven fabric manufacturing method - Google Patents

Description

  The present invention relates to an ear gripping device for a loom. More specifically, when weaving a high-density fabric, an ear gripping device for a loom for effectively suppressing the occurrence of ear sag in the vicinity of the ear, a loom equipped with the loom, and a method of manufacturing a fabric using the same About.

  Conventionally, many high-density fabrics using synthetic fiber multifilaments such as polyester and nylon have been proposed, mainly for sports clothing and industrial use. Due to the diversification of applications, there is a demand for fabrics that are further thinned and have increased strength accordingly.

  In general, when weaving a high-density fabric, the larger the cover factor, the greater the amount by which the weaving port before weaving moves to the warp feed side from the advance position of the reed. This causes the following inconvenience.

(Note that the cover factor means that the total warp fineness is D1 (dtex), the warp density is N1 (line / 2.54 cm), the total weft fineness is D2 (dtex), and the weft density is N2 (line / 2.54 cm). Then, (D1 × 0.9) ^1/2 × N1 + (D2 × 0.9) ^1/2 × N2.
(A) The fabric in the vicinity of the weave causes a bumping phenomenon, and it becomes difficult to obtain a fabric having a desired weft density.
(B) The warp induces fluff and cannot be woven stably.
(C) When the rotational speed of the loom is increased, a phenomenon in which the amount by which the weaving port of the ear moves to the warp feeding side from the advance position of the reed becomes more remarkable. The warp looseness of the ear part causes a difference in the length of the cloth between the ear part and the center part, and the wavy phenomenon of the ear part, so-called ear sagging (also called “ear slack” or “ear fluttering” in Japanese) appears. To do. The woven fabric is formed into a desired product by cutting and sewing, but is usually used close to the end of the woven fabric in order to make maximum use of the woven fabric for the intended purpose. Since the edge of the cut product is easily frayed, if there is an ear slack in the vicinity of the ear, cutting failure occurs, and the shape as a product cannot be ensured or the function is not exhibited.
(D) Ear sagging in a living machine not only interferes with the processing passability of the roll winding process, the scouring process, and the setting process, but also causes wrinkles in the resulting fabric.
As a technique for suppressing the occurrence of sagging in the ear, a method of increasing the weaving density of the ear part to the weaving is higher than the weaving density of the main part of the fabric (Patent Document 1), and a method of driving the yarn further into the ear part composed of the ground yarn and the entangled yarn. (Patent Document 2), a method of using a modified cross-section yarn for a part of a plurality of yarns outside the fabric (Patent Document 3), a method of flattening the cross-sectional shape of the warp of the ear (Patent Document 4) ) Is known, but it cannot always be said that it can sufficiently prevent the occurrence of ear sag.

  Separately from the above technology, in the air jet loom or water jet loom, a pair of gripping rollers are provided at the reach of the flying weft yarn, and the weft yarn is given a restraining tension for a predetermined time until the warp tightening is completed. There are known a method of pressing the spring back (Patent Document 5) and a method of driving and controlling a weft tensioning device provided at the weft arrival portion (Patent Document 6).

JP-A-9-302549 Japanese Patent Laid-Open No. 9-302550 JP 2001-355143 A JP 2003-221749 A Japanese Patent Laid-Open No. 10-46445 Japanese Patent Laid-Open No. 10-298850

  However, each of the above prior arts has a problem that it requires complicated control in order to grip the flying weft, leading to an increase in the cost of manufacturing the fabric.

  In view of the drawbacks of the above-described prior art, the present invention provides an ear gripping device for a loom capable of effectively suppressing the retreat of the ear weaving mouth and the occurrence of sagging ears when weaving a high-density fabric at high speed, It is an object of the present invention to provide a loom and a method for manufacturing a woven fabric.

In order to solve the above problems, the present invention comprises the following means.
The present invention as the first invention,
(1) An ear gripping device attached to a loom,
The ear part gripping device has an ear part passage space through which an ear part formed by entanglement of a yarn and a weft thread can pass in the feeding direction of the fabric, and a weft movement gap through which the weft thread can pass. Even when cut by a weft cutter of a loom, the lobe ear gripping device has means for maintaining the entangled state of the ear.
The first embodiment is
(2) In the loom ear gripping device, the means for maintaining the entangled state of the ear portion is an elastic ear pinching member in the ear portion passage space.
The second embodiment is
(3) The ear gripping device for a loom according to claim 2, wherein the ear elastic clamping member is a plate spring or a member made of an elastic member and a plate material.
As another invention of the first invention ,
(4) The loom ear gripping device for a loom is a loom that is an ear of a fabric and is present at a position of a weft cut by a weft cutter.
And, as yet another aspect of the first invention,
(5) A method for producing a woven fabric in which a predetermined number of warp yarns are aligned, the additional yarns are aligned outside the aligned warp yarns, and the weft yarns are supplied to the warp yarns and the additional yarns. The weft is used to cut the weft yarns. In this case, the loom is gripped by the loom ear gripping device existing in the loom.
As an embodiment thereof,
(6) The method for producing a woven fabric, comprising a step of gradually releasing the yarn from the ears discharged from the ear part holding device for a loom.
In addition, as an invention of another method for producing a fabric,
(7) A method for manufacturing a woven fabric in which a predetermined number of warps are aligned, the additional yarns are aligned outside the aligned warps, and the wefts are supplied to the warps and the additional yarns. A method for producing a woven fabric characterized by grasping an ear portion when cutting a weft after being struck.
And as a second invention,
(8) A loom including a weft nozzle, a weft cutter, and an ear gripping device,
(A) The ear gripping device includes: (a) an ear part passage space in which an ear part formed by entanglement of a weft yarn and a weft thread can pass in the feeding direction of the fabric; a weft movement gap through which the weft thread can pass; Means for maintaining the entangled state of the ear even when the weft is cut with a weft cutter of a loom, and (b) the weft nozzle side of the fabric or the weft nozzle side of the fabric It is arranged on the opposite side to the weft nozzle,
(B) When the ear gripping device is disposed on the weft nozzle side, a weft cutter is disposed between the weft nozzle and the ear gripping device, and the ear gripping device is connected to the weft nozzle. Is arranged on the opposite side, the ear gripping device is arranged between another weft cutter arranged on the side opposite to the weft nozzle and the fabric.
It is a loom.
As the embodiment,
(9) The loom, wherein the means for maintaining the entangled state of the ears is an elastic ear pinching member in the ear part passage space,
(10) The loom according to (9), wherein the ear pinching member is a plate spring or a member made of an elastic member and a plate material.
As another invention of the second invention,
(11) A method for producing a woven fabric in which a predetermined number of warp yarns are aligned, the additional yarns are aligned outside the aligned warp yarns, and weft yarns are supplied to the warp yarns and the additional yarns. 10) A method for producing a fabric using the loom according to any one of the above, wherein the ear is gripped by the ear gripping device existing in the loom when the weft is cut.
As the embodiment,
(12) The method for manufacturing a woven fabric, comprising a step of gradually releasing the yarn from the ears discharged from the ear part holding device.
As still another invention of the second invention,
(13) A method for producing a woven fabric in which a predetermined number of warps are aligned, the additional yarns are aligned outside the aligned warps, and wefts are supplied to the warps and the additional yarns,
When wefts are cut after wefts are supplied and beaten into the fabric, the weaves are gripped by the entanglement of the increased yarn and the wefts, and the wefts are cut and the entangled state of the ears is maintained. And the ear part are moved, and then the yarn is removed from the weft.

  When weaving using the ear part gripping device for a loom according to the invention (1), the ear part is in the ear part gripping device and is maintained so as to maintain the entangled state, thereby preventing the occurrence of weft crimps. It is possible to prevent loosening of the warp and effectively suppress the sagging of the ear. Similarly, if a job is made by using the loom ear gripping device according to the embodiment (2), the ear portion in the ear gripping device is elastically held by the ear elastic holding member. The ears are fed more smoothly and the entangled state between the increased yarns and the wefts is more reliably maintained, so that weft crimps can be prevented and warp slack can be prevented and ear sagging can be effectively suppressed. can do.

  Further, if the job is made using the loom ear gripping device according to the invention (3), the ear elastic pinching member is composed of a plate spring or a member made of an elastic member and a plate material, so that the structure is simple. In addition, the ears are fed more smoothly and the entangled state of the increased yarns and wefts is more reliably maintained, so that the weaving at the end of the ears and the occurrence of sagging of the ears are further reduced. Effective and inexpensive deterrence.

  If weaving is performed using the loom according to the invention (4), weaving can be performed while effectively suppressing the retreat of the weave at the end of the ear and the occurrence of ear sagging.

  Further, according to the weaving method according to the invention (5), the ear part is in the ear part gripping device and is configured to maintain the entangled state, so that weft crimping can be prevented and warp loosening can be prevented. It is possible to obtain a woven fabric that is prevented and effectively prevents ear sag.

  According to the embodiment (6), the yarn is removed from the ear portion discharged from the ear gripping device as the fabric moves, so that the cutting operation of the ear portion is not required, and the additional yarn is wound up separately. And it can be reused.

  Furthermore, according to the weaving method according to the invention (7), the ear portion is configured to maintain its entangled state, so that it is possible to prevent the occurrence of weft crimps, to prevent warp loosening, and to effectively reduce the ear sagging. Deterred fabrics can be obtained.

  In the invention of the weaving method, in particular, weaving with a fluid jet loom such as a water jet loom, the ear gripping device for the loom is installed on the side of the weft nozzle that is the nozzle for launching the weft, and the weft is used for the weft nozzle and the loom Even when it is cut with a weft cutter between the ear gripping devices, the ear portion is in the ear gripping device and is configured to maintain the entangled state. In addition to preventing warp loosening, it is possible to effectively suppress ear sagging.

The schematic plan view which shows the principal part of the loom including the ear | edge part holding | gripping apparatus for looms. The schematic perspective view which shows the ear | edge part holding | gripping apparatus for looms. The schematic cross section of the ear | edge part holding | gripping apparatus for looms using a pair of leaf | plate spring as an ear | edge part elastic clamping member. The schematic cross section of the ear | edge part holding | gripping apparatus for looms using a pair of leaf | plate spring as an ear | edge part elastic clamping member. The figure which shows the evaluation method of an earloose.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  The ear part gripping device for a loom according to the present invention includes an ear part passage space in which an ear part formed by entanglement of a yarn and a weft thread can pass in the feeding direction of the fabric, and a weft movement in which the weft can move in the feeding direction of the fabric. The loom ear gripping device has a gap and has means for maintaining the entangled state of the ear even when the weft is cut by a weft cutter.

  In addition, an auricle is a weft thread that has been cut from the weft nozzle and then protruded from the fabric. Thickening is a thread that is inserted in the warp direction outside the fabric to entangle the auricle separately from the fabric yarn. Like the warp, wefts are inserted between the yarns to form a state where the yarns and the wefts cross each other at different positions, that is, entangled. The ear part is a part where the auricle and the yarn are entangled.

  FIG. 1 is a schematic plan view showing an outline of weaving when the ear part gripping device for a loom of the present invention is installed on the weft nozzle side. 1 is a warp, 2 is a yarn, 3 is a kite, 4 is a weft nozzle. Reference numeral 5 is a weft, 6 is a weft cutter, 7 is an ear gripping device for a loom, 8 is an auricle, and 9 is a bran wing. In the weaving, there are a plurality of warps on the right side of FIG. 1, and wefts 5 and heels 3 are further extended, but are not shown.

  The weft 5 supplied from the weft nozzle 4 is inserted between the wefts 2 supplied from the yarn supply device (not shown) and between the warps 1 supplied from the warp supply device (not shown). The The weft 5 inserted between the warps 1 is driven by the reed 3 and the reed wing 9 to form the fabric 10 and the ear part 11. The tip of the driven weft 5 is usually entangled by a catch cord (not shown) or the like, and the weft tension is maintained for a predetermined time. Thereafter, the anti-nozzle side weft cutter (not shown) is interposed between the fabric 10 and the catch cord. ) And the catch cord is collected.

  The ear portion 11 in which the yarn 2 and the weft yarn 5 are entangled is supplied to the loom ear gripping device 7 without being beaten, and moves in the ear gripping device in synchronization with the movement of the fabric 10 and the ear chamber 8. To do. At this time, the weft 5 is cut by the weft cutter 6 immediately after beating, but the ear 11 after the weft cut is in the ear gripping device and the entangled state is maintained, so that weft crimp is generated. And warp loosening can be prevented.

The ear part 11 from which the weft has been cut is directly discharged from the ear part holding device and moves together with the fabric 10. However, the entangled state between the increased yarn 2 and the auricle 8 is not maintained when the ear 11 is ejected from the loom ear gripping device. The auricle 8 gradually moves away from the yarn increase 2. Reinforcement yarn 2 moves alone. The fabric 10 and the ear chamber 8 move together. The increased yarn 2 is collected through a guide (not shown) on the same route as the catch cord on the side opposite to the weft nozzle (not the weft nozzle) or by another winding device.
With such a mechanism, weft crimping and warp loosening after weft cutting do not occur, and the retreat of the weave at the end of the ear and the occurrence of ear sagging are effectively suppressed.

  In order to prevent weft crimps and warp loosening, the length of gripping the ears (that is, the length in the longitudinal direction of the fabric where the means for maintaining the entangled state of the fabric ears presses the ears. The part gripping length is preferably 2 to 15 mm, and more preferably 3 to 10 mm. By setting it within this range, high tension can be maintained even if the weft is cut after beating, and the fabric structure can be stabilized.

  The width for gripping the ear part (that is, the length in the direction perpendicular to the longitudinal direction of the fabric in which the ear part gripping device for a loom grips the ear part (the direction in which the yarns forming the ear part are arranged). It is preferably a width that can grip the entire ear portion. However, the present invention is not limited to the above as long as the width can maintain a high tension in order to stabilize the woven fabric structure even if the weft is cut after beating.

  In addition, although the ear | edge part holding | grip apparatus for looms is distribute | arranged only to the weft nozzle side of the fabric 10, you may distribute | arrange also to the anti-weft nozzle side. When the loom ear gripping device is disposed on the side of the anti-weft nozzle, it is preferably provided between the fabric and the weft cutter on the side of the anti-weft nozzle. In this case, as with the weft nozzle side, the yarns are aligned on the anti-weft nozzle side of the fabric, forming an ear portion entangled with the driven weft yarn, and the ear portion gripping device for the loom in the vicinity of the ear portion before weaving Is preferably arranged. More preferably, the loom ear gripping device on the weft nozzle side and the loom ear gripping device on the anti-weft nozzle side face each other through the warp of the fabric so that the weft tension is most maintained.

  FIG. 2 is an enlarged schematic perspective view of the loom ear gripping device 7 according to the present invention installed on the weft nozzle 4 side. 1 is a warp yarn, 2 is a warp yarn, 4 is a weft nozzle, 5 is a weft yarn, 8 is an auricle, 10 is a fabric, and 11 is an ear. The fabric 10 is fed from the upper right side of the drawing to the lower left side of the drawing. Further, there are a plurality of warps in the lower right part of the drawing, and the wefts 5 further extend, but are not shown.

  The loom ear gripping device 7 is preferably provided at least on the weft nozzle side of the fabric 10, but in addition to this, it is preferably provided on the anti-weft nozzle side.

  The ear gripping device 7 for a loom according to the present invention has an ear outlet 71B from an ear passage space through which an ear 11 formed by entanglement of the yarn 2 and the weft 5 can pass in the direction of feeding the fabric, An ear entrance 71 </ b> A (not shown) to the ear passage space formed on the upstream side of the yarn increase 2 of the ear gripping device 7 for the loom is provided. The exit 72B of the ear part is a fabric side weft moving gap for allowing the auricle 8 to move parallel to the delivery direction of the fabric 10, and the weft nozzle side weft (not shown) is provided on the weft nozzle side of the loom ear gripping device 7. A moving gap 72A is formed.

  The ear part 11 enters the ear part passing space part from the entrance 71A of the ear part passing space along the feeding direction of the fabric 10, and the ear chamber 8 is located between the nozzle side weft moving gap 72A and the fabric side ear moving gap part 72B. The weft 5 is cut by the weft cutter between the weft nozzle 4 and the loom ear gripping device 7 in the ear portion passage space. Even in such a case, the confounding state of the ear is maintained.

As a means of maintaining a confounding state of the ear portion 11 In the loom lugs gripping the device, in the ear portion passage space, the sliding member that does not interfere with the movement of the ears and the like. A method of appropriately setting the ear passage space size according to the ear portion dimension so that the ear portion 11 can be gripped can be adopted, but the ear portion is placed in the ear passage space of the loom ear gripping device. The method of arranging the ear elastic holding member that holds elastically is simpler and more reliable.

  In this case, as the ear elastic pinching member, a rubber plate or a resin plate provided in the ear portion passage space, or a member made of an elastic member such as a coil spring or rubber and a plate material such as metal can be used. Further, it is advantageous in terms of structure and simplicity, that is, cost, to use a leaf spring fixed in the ear passage space. The contact portion with the ear portion preferably has a bottom friction surface.

  FIG. 3 is a schematic cross-sectional view of a loom ear gripping device using a pair of leaf springs 74A and 74B as the ear elastic pinching member. In FIG. 2, when cutting at a surface perpendicular to the weft 5 in FIG. Equivalent to.

  In weaving, since the woven fabric is forcibly taken up by the winding roll, the ear portion 11 is in an entangled state with the additional yarn 2 and the weft yarn 5 from the right side to the left side of the drawing, that is, the entrance to the ear portion passage space. It moves from 71A to the exit 71B from the ear part passage space. 74A and 74B are a pair of holding members such as a pair of carbon steel leaf springs in the ear part passage space part, and are fixed to the upper and lower wall surfaces of the ear part passage space part by two bolts 73, respectively. Therefore, the elastic ear member holds the ear portion 11 in the ear portion passing space portion from the upper and lower surfaces to the leaf springs 74A and 74B. Even when the weft thread 5 is cut between the weft nozzle 4 and the loom ear gripping device 7, the cut weft thread 5 is prevented from coming out or loosening from the ear section 11, The part 11 is in the lobe ear gripping device 7 and maintains its entangled state. When the ear part 11 moves in the ear part passage space part, is discharged from the ear part gripping device 7 for looms, and the fabric 10 moves together with the auricle 8, the entangled state between the yarn 2 and the cut auricle 8 is loosened, As described above, the cut ear chamber 8 is gradually separated from the yarn 2 and the yarn 2 is singly separated from the fabric 10 and the ear chamber 8.

  The elastic ear pinching members are not necessarily configured as a pair, and may be an upper (or lower) wall surface in the ear passage section and a single leaf spring disposed below (or above) the same. Various types of leaf spring shapes can be adopted, but in order to hold the ear portion with a uniform stress over a certain length, as shown in FIG. It is preferable to use a pair of leaf springs 74A and 74B provided. The length and width of the plate-shaped portion and the thickness of the leaf spring material are determined from the ear gripping device 7 for a loom, taking into account the number and thickness of the yarns constituting the ear, the thickness of the ear, etc. What is necessary is just to set suitably so that the entangled state of an ear | edge part may be maintained in the discharged ear | edge part so that the weft crimp and warp looseness after cutting a weft may not arise. Further, the material is not limited to carbon steel, and stainless steel, phosphor bronze, beryllium copper, resin, and the like can also be employed.

  FIG. 4 is a schematic cross-sectional view of the loom ear gripping device 7 shown in FIG. 3 cut along a plane orthogonal to the feeding direction of the yarn 2. In this figure, 72A is a weft movement gap for moving the weft (before and after cutting) on the weft nozzle side together with the ear part, and 72B is for moving the weft 5 inserted in the weft 10 feeding direction. The weft movement gap. These weft movement gaps 72A and 72B can adjust the gap so that the entangled portion (that is, the ear portion) between the weft passing through the weft thread but in the entangled state and the weft thread does not pass through. Even when cut, the entangled state is maintained, so that weft crimps are not generated by the disconnected or loosened wefts, and the atrial settling due to warp looseness does not occur. Therefore, the height of the weft movement gap is preferably smaller than the height of the entrance and exit of the ear portion passage space.

  The fabric woven using the loom ear gripping device according to the present invention is particularly useful when weaving a high-density fabric typically used in sports clothing and industrial materials, but is not limited thereto. It is not a thing.

  The warp and weft yarns used for weaving are not particularly limited, and chemical fibers, natural fibers, and the like can be used. Examples of chemical fibers include polyamide fibers, polyester fibers, aramid fibers, rayon fibers, polysulfone fibers, ultrahigh molecular weight polyethylene fibers, and natural fibers such as cotton, hemp, silk, and wool. However, when weaving a high-density fabric, chemical fibers are preferable, and polyamide fibers and polyester fibers excellent in mass productivity and economy are preferable. Polyamide fibers are preferable from the viewpoint of heat resistance and fluff products. More preferred are fibers.

  Examples of polyamide fibers include nylon 6, nylon 66, nylon 12, nylon 46, copolymer polyamide of nylon 6 and nylon 66, and copolymer obtained by copolymerizing nylon 6 with polyalkylene glycol, dicarboxylic acid, amine, and the like. Mention may be made of fibers made of polyamide or the like. Examples of the polyester fiber include fibers made of polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, and the like. It may be a fiber obtained by copolymerizing polyethylene terephthalate or polybutylene terephthalate with isophthalic acid or 5-sodium sulfoisophthalic acid as an aromatic dicarboxylic acid component, or a fiber obtained by copolymerizing an aliphatic dicarboxylic acid such as adipic acid.

  In addition, these synthetic fibers have a heat stabilizer, an antioxidant, a light stabilizer, a smoothing agent, an antistatic agent, a plasticizer, in order to improve productivity in spinning / drawing process and processing process, or characteristics. Additives such as thickeners, pigments, and flame retardants may be included.

  Moreover, as a form of the fiber, a multifilament yarn is preferably used in that the effect of the present invention is remarkably exhibited.

  Furthermore, the single yarn cross-sectional shape is not limited to a round shape, and may be any shape. For example, a left-right asymmetric type such as a flat shape, a rectangular shape, a rhombus shape, and a saddle shape, a left-right asymmetric type, or a combination type thereof may be used. Furthermore, there may be protrusions, irregularities, and hollow fibers.

  The fabric produced by using the loom ear gripping device according to the present invention can use a plain structure, a twill structure, a satin structure, a deformed structure thereof, and the like, but is not particularly limited thereto.

  A woven fabric manufactured using the ear gripping device for a loom according to the present invention is woven using warps, wefts, and reinforcing yarns as basic yarns. The term “multiplying” is used to prevent the wefts from loosening by sandwiching the wefts by utilizing the rigidity thereof, and forms the ear portion by entanglement with the wefts.

  A predetermined number of warps are aligned, and additional yarns are aligned on the outside of the aligned warps, wefts are supplied and driven, and weaving of the fabric is performed. After maintaining the entangled state of the supplied weft yarn and the increased yarn by the gripping device, the fabric is discharged from the ear portion gripping device for the loom of the fabric. In other words, the ear gripped by the loom ear gripping device in the vicinity of the ear portion before weaving moves in the loom ear gripping device in synchronization with the movement of the fabric, and is then discharged.

The discharged ear portion moves with the movement of the fabric, but as described above, the yarn is gradually removed from the weft cut portion of the ear portion, so that the finished fabric does not include the yarn. That is, the warp yarn is supplied by a feeding device different from the warp yarn , but the warp yarn is passed through the heald and the heel, whereas the warp yarn does not pass through the heel and is entangled by the opening movement similar to the warp yarn. At the same time, an ear portion is formed and passed through the loom ear gripping device. The thickening is supplied from the vicinity of the warp beam, applied with a spring-type tensor, and passed through the opening heald. The weft is made to fly with high-pressure water or air, and after the warp and weft are driven with a scissors, the weft is cut with a weft cutter. Here, since the ear part gripping device for a loom according to the present invention grips so as to maintain the entangled state of the ear part, the cut weft is prevented from coming off or loosening from the ear part. Thereby, compared with the case where the fiber ear | edge part holding | gripping apparatus is not installed, the weft crimp of an ear | edge part becomes small and the crimp of a warp becomes large. As a result, the warp tension is increased, the gripping force of the weft is increased, and the weaving of the ear is reduced. Therefore, since the fabric length difference between the ear end portion and the center portion of the fabric is reduced, the amount of arc shape is reduced, and the ear sagging can be improved.

  When weaving by a conventional method, the weave before weaving is represented by the distance from the temple tip to the weave. When wefts are caused to fly by high-pressure water or compressed air, high tension is applied to the wefts. When the weft is cut with a cutter after the weft has been driven by the scissors, the free end of the weft returns to the ground side. A decrease in the weft tension at the ear portion of the woven fabric results in a larger crimp of the weft yarn, and conversely, a smaller warp crimp at the ear portion, resulting in a lower warp tension at the ear portion. As a result, there is no gripping force of the weft by the warp, and the retreat of the weave becomes large. And the amount of the arc shape of the fabric increases, leading to the generation of sag and deterioration of the physical properties of the fabric. However, weaving using the loom ear gripping device according to the present invention solves the above problems.

  The weaving using the weaving ear gripping device according to the present invention is usually performed from a triangular cone or a paper tube without using a planetary device or a bobbin. In particular, it is preferable to use a spring washer in order to manage the tension during supply.

  It is preferable that the yarn is a multifilament or a crimped yarn because a variation in the tension of the yarn during weaving is small by giving an appropriate crimp. The material of the yarn addition is not particularly limited, but is preferably selected so that polyester or nylon is generally easily available and the yarn characteristics with the warp are close.

  The total fineness of the yarn addition is preferably larger than the total fineness of the weft. This is because the entanglement strength between the weft and the weft at the ear is kept larger than the entanglement strength between the warp and the weft, and the weft after cutting is prevented from falling off or loosening from the ear.

  The number of yarns is preferably 4 to 8 from the viewpoint that the effects of the present invention can be maximized.

  The fabric using the loom ear gripping device according to the present invention is preferably woven in a jet loom because it can be operated at high speed. In particular, the water jet loom is preferable in that the effect of the present invention is remarkably exhibited. In the water jet loom, the weft yarn is caused to fly by high-pressure water, and after the weft yarn is driven, the weft yarn is cut at the weft nozzle side. For this reason, water jet looms tend to have higher weft flying tension than air jet looms and rapier looms, and further improvement in the weft gripping force of the ears is required. This is because the effects of the use of the additional yarn (multiplier yarn) and the ear part gripping device for a loom of the present invention are remarkable.

  When weaving a high-density fabric using the ear gripping device for a loom according to the present invention, after weaving in a water jet loom, scouring is performed to remove the oil agent attached to the raw yarn and / or to remove wrinkles. -Set processing is preferable.

  Although the width of the woven fabric is not particularly limited, it is particularly useful in a woven fabric having a warp yarn area of 140 cm or more, particularly 180 cm or more, since the larger the width, the more likely the ear sag occurs. The upper limit is preferably 280 cm or less from the viewpoint of production.

  Next, a method for weaving using the loom ear gripping device according to the present invention will be described.

  The yarn is used as a warp, an additional yarn, and a weft, warps and an additional yarn having a fineness according to the fabric design are warped and applied to a loom, and the weft is similarly prepared. Thickening is usually thicker than warp. As the loom, it is preferable to use a water jet loom from the viewpoint of reducing the generation of warp and improving productivity.

  The tension of the warp and the additional yarn is preferably 10 to 250 cN / line, more preferably 20 to 200 cN / line. By setting it within such a range, voids between single fibers in a yarn bundle of yarns constituting the fabric can be reduced, and a dense fabric can be obtained. In addition, after weft insertion, the warped yarns that have been tensioned above push and bend the weft to increase the fabric binding force in the weft direction, improve the fabric's pile misalignment, and strengthen the seam portion of the sewn product. can do. When the warp tension is small, the contact area between the warp and the weft in the woven fabric cannot be increased, and it is difficult to obtain a sliding resistance force to a desired position, and the effect of reducing the gap between the single fibers is small. When the warp tension is too high, the warp tends to be fluffed by friction with heald mail.

  Specific methods for adjusting the warp tension within the above range include adjusting the weft feeding speed of the loom and adjusting the weft driving speed. Whether or not the warp tension is actually within the above range during weaving can be confirmed, for example, by measuring the tension applied per warp in the middle of the weaving machine between the warp beam and the back roller. . Moreover, it is preferable to make a difference between the upper thread sheet tension and the lower thread sheet tension at the warp opening.

  As an adjustment method, for example, there is a method in which the back roller height is set at a position higher by, for example, 10 to 30 mm from the horizontal position, and the running line length of the upper thread and the lower thread is made different. As another method for providing the difference between the upper thread tension and the lower thread tension, for example, a cam drive system is adopted in the opening device, and the dwell angle on one side of the upper thread / lower thread is set to be 100 degrees or more larger than the other. There is also a method, and the tension increases when the dwell angle is increased.

  Next, if necessary, processing such as scouring and heat setting is performed after the weaving process.

  The fabric woven using the ear gripping device for a loom according to the present invention can effectively suppress the receding of the fold of the ear and the occurrence of sagging ears even when weaving at high speed. For example, even when the loom is operated at a high speed of about 400 to 900 rpm, the occurrence of ear slack is extremely suppressed, so that it can be cut into a shape as designed and sewing is easy. In addition, since the occurrence of ear sag is suppressed, it is advantageous in terms of cost with less fabric disposal.

  Hereinafter, the configuration and effects of the present invention will be described in detail with reference to examples.

[Measuring method]
(1) Total fineness According to JIS L 1013: 2010 8.3.1 A method, the positive fineness was measured at a predetermined load of 0.045 cN / dtex to obtain the total fineness.

(2) Number of single fibers Calculated by the method of JIS L 1013: 2010 8.4.

(3) Single fiber fineness Calculated by dividing the total fineness by the number of single fibers.

(4) Weft density of warp and weft yarns Measured based on JIS L 1096: 2010 8.6.1.
The sample was placed on a flat table, and the number of warp yarns and weft yarns between 2.54 cm was counted at five different locations, excluding unnatural wrinkles and tension, and the average value was calculated.

(5) Strength / Elongation Measured under the constant speed elongation condition shown in JIS L 1013: 2010 8.5.1 standard time test. The sample was “TENSILON” UCT-100 manufactured by Orientec Co., Ltd., and the gripping interval was 25 cm and the pulling speed was 30 cm / min. In addition, elongation was calculated | required from elongation of the point which showed the maximum strength in a SS curve.

(6) Warp tension during weaving Using “Check Master” (registered trademark) (model: CM-200FR) manufactured by Kanai Koki Co., Ltd., one warp in the middle of the warp beam and the back roller during operation of the loom The tension applied to the hit was measured.

(7) Evaluation of Ear Slack As shown in FIG. 5, two marks (102A, 102B) are attached to the center of the fabric 10 in the width direction at intervals of 500 mm, and the marks 102A, 102B of each fabric center are attached. Two lines (103A, 103B) are drawn along the weft in the direction from the weft nozzle side end 101A of the woven fabric, which is at both ends in the width direction, to the direction opposite to the weft nozzle side end 102B of the woven fabric. In this case, since the entangled state of the fabric 10 tends to be loosened on both sides compared to the center, the two lines are curved toward the front side of the fabric on both sides as shown in FIG. , That is, the distance between the lines 103A and 103B in the weft direction shows that the peripheral part tends to be wider than the central part. Accordingly, the distance between the two weft-direction lines 103A and 103B is 500 mm at the center of the fabric, but when the ear slack increases, both ends of the fabric weft nozzle side 101A are not on the fabric weft nozzle side. The distance between the two lines 103A and 103B in the weft direction becomes wider toward the end 101B side.

  Next, between the two weft direction lines 103A and 103B, a line in the warp direction at intervals of 20 mm from the weft nozzle side end 101A of the woven fabric, which is both ends of the woven fabric, and the anti-weft nozzle side end 101B of the woven fabric, That is, the warp direction lines 104A and 104B are drawn and cut along the weft direction lines 103A and 103B and the warp direction 104A and 104B to obtain strips having a shape close to two rectangles formed at the ends of the fabric. The length of the strip in the warp direction (that is, the length direction) was measured to evaluate the ear sag.

[Example]
(Warp and weft)
A multifilament made of polyester, having a circular cross-sectional shape, having a single fiber fineness of 2.33 dtex, a filament count of 36, a total fineness of 84 dtex, no twist, a strength of 4.21 cN / dtex, and an elongation of 40% was prepared.

(Weaving)
In the water jet loom using the above-mentioned yarns for warp and weft and provided with a weaving ear gripping device to be described later, the warp tension during weaving is 20 cN / piece, the loom rotation speed is 500 rpm, the warp density is 133 pieces / 2.54 cm A plain woven fabric having a weft density of 133 pieces / 2.54 cm and a width (width of a portion where warp is present) of 200 cm was woven.

  In addition, the warp yarn is made of polyester, has a circular cross-sectional shape, and uses three twisted yarns having a single fiber fineness of 3.44 dtex, a filament count of 96 f, and a total fineness of 330 dtex, and a predetermined number of warps. The four yarns were supplied to both the outer sides of the yarns and aligned, and the yarn tension was set at 130 cN / piece. A gap of 5 mm was provided between the warp and the yarn for the auricle. The ejected ear part was gradually removed from the thread in the ear chamber, and the thread was recovered through the guide along the same route as the catch cord on the side of the counter weft nozzle.

(Ear gripping device for weaving)
The ear portion includes an ear portion passage space portion in which an ear portion formed by entanglement of a yarn and a weft yarn can pass in the fabric feeding direction, and a weft movement gap portion in which the weft yarn can move in the fabric feeding direction. The two weaving ear gripping devices shown in FIG. 3 provided with a pair of leaf springs arranged in the passage space are installed at the respective ends of the weft nozzle side and the counter-weft nozzle side in the vicinity of the weaving machine before weaving.

  The main body of the weaving ear gripping device 7 has a rectangular parallelepiped shape (width 6 mm, height 30 mm, length 25 mm) made of stainless steel. As shown in FIG. 3, the weaving ear gripping device 7 includes an inlet 71 </ b> A to the ear part passage space having a width of 4 mm and a height of 10 mm and an outlet 72 </ b> A from the ear part passage space. And two elastic ear | edge part clamping members are provided in the ear | edge part passage space from the upper and lower sides. The two elastic lug clamping members are made of stainless steel having a thickness of 0.3 mm, and each of the plate springs 74A and 74B is composed of leaf springs 74A and 74B and leaf spring supports 75A and 75B, and has a length of 20 mm. An arc portion is provided at both ends of the flat plate portion, and is fixed to the leaf spring supports 75A and 75B by bolts. As a result, the ear gripping length was 20 mm, and the ear gripping width was 4 mm. The ear portion is sandwiched between the flat plate portions of the pair of leaf springs so that the ear portion passes in synchronization with the flow of the fabric. Further, as shown in FIG. 4, weft nozzle side weft movement gaps 72 </ b> A and fabric side ear movement gaps 72 </ b> B are formed on both sides of the weaving ear part gripping device 7. The width of the gap is slightly larger than the diameter of the weft, but is smaller than the thickness of the ear portion where the weft and the yarn are entangled. As a result, the wefts move in parallel along the flow of the fabric, but even after the wefts are cut by the weft cutter, the ears do not come out from the weft movement gap to the fabric side.

[Comparative example]
Weaving was carried out in the same manner as in the example except that the weaving ear gripping device and the yarn increase were not used.

[Evaluation of ear sagging]
Below, the woven fabric obtained by the Example and the comparative example was evaluated by the evaluation method of the above-mentioned ear sagging. Indicates the length of the strip. As is clear from this, the fabric woven using the weaving ear gripping device according to the present invention has reduced the retreat of the weave at the ear end and the occurrence of sagging ears.
[Example]
L side: 510.5mm
R side: 512.5mm
[Compared ears]
L side: 518.0 mm
R side: 520.0mm

DESCRIPTION OF SYMBOLS 1 Warp 2 Reinforcement 3 筬 4 Weft nozzle 5 Weft 6 Weft cutter 7 Weaving machine ear part gripping device 8 Ear chamber 9 筬 Master feather 10 Fabric 11 Ear part 71A Ear part passage space part inlet 71B Ear part passage space part outlet 72A Weft thread side weft movement gap,
72B Fabric side weft moving gap 73 Bolts 74A, 74B Leaf springs 75A, 75B Leaf spring support 101A Fabric weft nozzle side end 101B Fabric non-weft nozzle side end 102A, 102B Fabric center mark 103A, 103B Lines 104A and 104B along the weft Lines L and R along the warp Strip X X Weft direction Y Warp direction

Claims (5)

A loom equipped with a weft nozzle, a weft cutter and an ear gripping device,
(A) The ear gripping device includes: (a) an ear part passage space in which an ear part formed by entanglement of a weft yarn and a weft thread can pass in the feeding direction of the fabric; a weft movement gap through which the weft thread can pass; Means for maintaining the entangled state of the ear even when the weft is cut with a weft cutter of a loom, and (b) the weft nozzle side of the fabric or the weft nozzle side of the fabric It is arranged on the opposite side to the weft nozzle,
(B) When the ear gripping device is disposed on the weft nozzle side, a weft cutter is disposed between the weft nozzle and the ear gripping device, and the ear gripping device is connected to the weft nozzle. Is arranged on the opposite side, a loom in which the ear gripping device is arranged between another weft cutter and a fabric arranged on the opposite side to the weft nozzle.   The loom according to claim 1, wherein the means for maintaining the entangled state of the ears is an elastic ear pinching member in the ear part passage space.   The loom according to claim 2, wherein the ear pinching member is a plate spring or a member made of an elastic member and a plate material.   A method for producing a woven fabric in which a predetermined number of warps are aligned, the additional yarns are aligned outside the aligned warps, and wefts are supplied to the warps and the additional yarns. A method for producing a woven fabric in which an ear portion is gripped by the ear portion gripping device existing in the loom when the weft is cut. The method for producing a woven fabric according to claim 4, further comprising a step of gradually releasing the yarn from the ears discharged from the ear part gripping device .

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