CN117845403A - Rapier weft insertion method for weaving and forming three-dimensional curved woven fabric and implementation device - Google Patents
Rapier weft insertion method for weaving and forming three-dimensional curved woven fabric and implementation device Download PDFInfo
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- CN117845403A CN117845403A CN202410179159.8A CN202410179159A CN117845403A CN 117845403 A CN117845403 A CN 117845403A CN 202410179159 A CN202410179159 A CN 202410179159A CN 117845403 A CN117845403 A CN 117845403A
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- 238000009941 weaving Methods 0.000 title claims abstract description 45
- 238000012966 insertion method Methods 0.000 title claims abstract description 24
- 239000002759 woven fabric Substances 0.000 title claims abstract description 24
- 230000007246 mechanism Effects 0.000 claims abstract description 38
- 238000000034 method Methods 0.000 claims abstract description 31
- 235000014676 Phragmites communis Nutrition 0.000 claims abstract description 29
- 230000008569 process Effects 0.000 claims abstract description 25
- 238000003780 insertion Methods 0.000 claims abstract description 20
- 230000037431 insertion Effects 0.000 claims abstract description 20
- 238000003860 storage Methods 0.000 claims abstract description 5
- 230000014759 maintenance of location Effects 0.000 claims abstract description 3
- 239000004744 fabric Substances 0.000 claims description 19
- 238000010009 beating Methods 0.000 claims description 9
- 239000004753 textile Substances 0.000 abstract description 2
- 238000010008 shearing Methods 0.000 abstract 1
- 230000008859 change Effects 0.000 description 5
- 235000013351 cheese Nutrition 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 5
- 238000009826 distribution Methods 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 238000007493 shaping process Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 206010020112 Hirsutism Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009986 fabric formation Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 210000003127 knee Anatomy 0.000 description 1
- 238000009940 knitting Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Classifications
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
- D03D47/27—Drive or guide mechanisms for weft inserting
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D25/00—Woven fabrics not otherwise provided for
- D03D25/005—Three-dimensional woven fabrics
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
- D03D47/34—Handling the weft between bulk storage and weft-inserting means
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D49/00—Details or constructional features not specially adapted for looms of a particular type
- D03D49/60—Construction or operation of slay
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
Abstract
The invention belongs to the technical field of textile, and relates to a rapier weft insertion method and a realization device for weaving and forming a three-dimensional curved woven fabric, wherein the rapier weft insertion method comprises the following steps: continuously feeding weft from the beginning of weft insertion to the end of beating-up so that the length of weft yarn after entering a shed dynamically changes along with the beating-up process; the device comprises a weft feeding mechanism, a reed, a sley, a rapier and a rapier head, wherein the weft feeding mechanism comprises weft storages, weft clamping devices and weft scissors which are sequentially arranged at intervals, and the device also comprises a weft fixing device positioned between the weft scissors and the rapier; the weft fixing device and the weft clamping device are positioned at two sides of the reed; the weft fixer is used for fixing one end of the weft yarn section entering the shed, and the weft yarn clamping device is used for clamping and holding the other end of the weft yarn section entering the shed; the weft feeding mechanism, the reed and the weft fixing device are all rigidly connected with the sley. The invention prolongs the continuous yarn feeding time, solves the problem of large number of warp yarns falling off due to insufficient weft yarn length in the three-dimensional curved surface forming stage, and avoids the possibility of weft yarn falling off from the weft selector after weft shearing.
Description
Technical Field
The invention belongs to the technical field of spinning, and relates to a rapier weft insertion method and a realization device for weaving and forming a three-dimensional curved woven fabric.
Background
Curved woven fabrics are commonly woven by a rapier loom and have wide application in the rapid production and processing of profiling textile products such as knees and toe caps.
Conventional shuttleless looms, such as rapier looms, have the weft yarn once pulled under tension straightened into the shed, the length of the weft yarn entering the shed remaining almost unchanged during the fabric formation process, due to the relatively fixed position of the weft feeder, scissor or weft receiver.
However, for a three-dimensional curved fabric, if a traditional rapier or other shuttleless weft insertion system is adopted, weft yarns keep a straightened state to pass through a shed under tension, weft yarns entering the shed can be separated from a weft feeding mechanism before beating up, the straightened state of the weft yarns in a plane when entering the shed is gradually converted into a curved buckling state in the three-dimensional curved fabric during beating up, at the moment, the distribution density of the warp yarns in the width direction and the reed-passing width are kept unchanged theoretically, and selvedge warp yarns are subjected to weft shedding due to the change of the weft yarn form; if the shuttle is adopted for weft insertion, the weft yarn is wound and stored on a pirn tube, and when the weft yarn is gradually from a plane straightening state to a curved buckling state during the weft insertion, although the weft yarn can be continuously pulled out from the shuttle for weft feeding to a certain extent due to the friction holding force between the weft yarn entering the shuttle and the warp yarn, the warp yarn has a tendency of keeping the warp direction position unchanged under the tensioning state, and the weft yarn is pulled to cause severe friction between the warp and the weft yarn and the movement of the selvedge warp yarn to the center of the cloth, thereby causing the problems of yarn hairiness, even breakage and poor shaping of the selvedge warp higher than the cloth body.
In the prior art, a profiling curved surface auxiliary is adopted for weaving and shaping curved surface fabrics, namely, an auxiliary modeling weaving principle is adopted, the profiling curved surface auxiliary restrains warp yarns at a weaving port to realize three-dimensional curved surface distribution, and a reed pushes weft yarns entering a shed to the weaving port in parallel to realize warp and weft yarn interweaving and shaping. For example, patent application CN112680863a discloses a 3D fabric and a preparation method thereof, and proposes a warp-direction profiling sheet auxiliary forming technology of a three-dimensional curved fabric and a warp let-off amount adjusting method in the weaving process; patent application CN116657311A discloses an in-situ net forming weaving method of a three-dimensional curved woven fabric, and provides a weft profiling sheet auxiliary forming technology of the three-dimensional curved woven fabric and a warp let-off amount adjusting method. However, the technical solutions described in these two patent applications still use the conventional weft insertion method, and when the weft yarn entering the shed changes from the initial straightened state to the bent state, the warp yarn is stripped or the width is unstable and even the weft yarn is broken during the beating-up process because the length of the weft yarn is generally unchanged.
Therefore, the presently disclosed forming method of the three-dimensional curved fabric seriously reduces the continuous weaving forming feasibility and the structural integrity of the three-dimensional curved fabric due to the defects of selvedge warp yarn weft removal, high yarn abrasion or uneven warp density distribution and the like caused by the fact that the dynamic change of weft feeding length cannot be satisfied in the beating-up process.
Therefore, there is still a need to develop a weft insertion method and a device for implementing the weft insertion method that satisfies the dynamic change of weft feeding length in the process of beating up for weaving and forming a three-dimensional curved woven fabric, so as to adapt to the weaving principle of auxiliary modeling.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a rapier weft insertion method and a realization device for weaving and forming a three-dimensional curved woven fabric.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a three-dimensional curved woven fabric weaves the rapier weft insertion method formed, the continuous weft supply from weft insertion beginning to beat-up ending, in order to make the weft yarn length change dynamically with beat-up process after entering the shed; in the prior art, the weft yarn length is kept unchanged after entering the shed only from the beginning of weft insertion to the beginning of beating-up, so that the problem that a large number of warp yarns are stripped due to insufficient weft yarn length in the three-dimensional curved surface forming stage is caused.
As a preferable technical scheme:
the rapier weft insertion method for weaving and forming the three-dimensional curved woven fabric comprises the following specific processes: after weft yarns are fed into a shed, weft yarns are fixed on the weft receiving side by a weft fixing device, the weft yarns entering the shed are kept in a connection state with a weft feeding mechanism for beating-up, the weft feeding mechanism and the weft fixing device translate synchronously along with a sley to a plane where a weaving port is located in the beating-up process, and after beating-up is finished, the weft yarns are disconnected from the weft feeding mechanism and the weft fixing device; unlike the present invention, the prior art weft insertion does not fix the weft yarn on the weft receiving side after feeding the weft yarn into the shed, and breaks the connection of the weft yarn of the shed to the weft feeder before beating up, so that the weft yarn length remains unchanged after entering the shed.
The invention also provides a device for realizing the rapier weft insertion method for weaving and forming the three-dimensional curved surface woven fabric, which comprises a weft feeding mechanism, a reed, a sley, a rapier and a rapier head, wherein the weft feeding mechanism comprises weft storages, weft clamping devices and weft scissors which are sequentially arranged at intervals, and the device also comprises weft fixing devices (Adideas electromagnetic valves 4V210-08+SMC JCMbZ20 or Qingzes 4V 210-08+cable emperor CDJ2B 10-15) positioned between the weft scissors and the rapier;
the weft fixing device and the weft clamping device are positioned at two sides of the reed; the weft fixer is used for fixing one end of the weft yarn section entering the shed, and the weft yarn clamping device is used for clamping and holding the other end of the weft yarn section entering the shed;
the weft feeding mechanism, the reed and the weft fixing device are all rigidly connected with the sley and keep consistent with the motion state of the sley;
because the weft yarn on the weft receiving side is fixed by the weft fixer, and the weft feeding mechanism and the weft fixer synchronously move along with the sley, the weft feeding mechanism continuously supplies the weft yarn in the process of pushing the weft yarn from the shed to the weaving shed; in the prior art, a weft fixing device is not arranged at the weft insertion side, a weft feeding mechanism is arranged separately from a sley, the weft feeding mechanism is kept motionless in the beating-up process, and continuous weft feeding from the beginning of weft insertion to the end of beating-up cannot be realized.
As a preferable technical scheme:
the device is characterized in that the weft accumulator is a yarn disc, the central shaft of the yarn disc is perpendicular to the arrangement direction of the reed and the length direction of the reed, and the yarn disc is used for winding and storing weft yarns, so that negative weft feeding is realized; the component with the function equivalent to that of the yarn disc of the invention in the prior art is a cheese or a bobbin, the cheese or the bobbin is axially unwound for weft feeding, and the weft yarn is added with one twist every time of winding.
The device comprises a weft clamping device and a weft holding device, wherein the weft clamping device consists of a pneumatic weft clamping device and a weft holding device, the weft holding device is positioned between the pneumatic weft clamping device and a weft scissors, the pneumatic weft clamping device is used for clamping the other end of a weft section entering a shed, and the weft holding device is used for holding the other end of the weft section entering the shed; the component with the function equivalent to that of the weft yarn clamping device is a weft selector, weft yarns pass through the yarn guide holes at the tail ends of the weft selector, the weft yarns are clamped by friction between the weft yarns and the yarn guide holes, the weft yarns can fall off the weft selector after weft cutting, and the weft yarn clamping device can eliminate the possibility that the weft yarns fall off the weft selector after weft cutting.
The device comprises a weft feeding mechanism, a weft feeding mechanism and a weft feeding mechanism, wherein the weft feeding mechanism further comprises a tension adjusting and weft breaking sensor (such as a Saimei broken yarn automatic stop sold by a filling knitting fitting and a weft sensor of Taiwan Dauhua technology Co., ltd.) which is positioned between a weft accumulator and a weft clamping device, the tension adjusting and weft breaking sensor is used for monitoring the tension of weft, adjusting and controlling the tension fluctuation in the weft insertion process and detecting whether the weft breaks; in the prior art, the cheese or the bobbin is adopted for weft feeding, and the weft pre-storage function of the weft accumulator is combined, namely, a cylinder of the weft accumulator is pre-wound with yarns with a certain length, so that weft tension fluctuation caused by different unwinding heights or unwinding circumferences of each circle of weft is eliminated when the weft is directly unwound from different positions of the cheese or the bobbin, and the effects of synergetic weft storage and weft tension adjustment are realized.
The invention also provides a rapier weft insertion method for weaving and forming the three-dimensional curved woven fabric by adopting the device, which comprises the following steps of:
the first step: leading out weft yarns from the weft accumulator, and sequentially passing through a tension adjusting and weft breaking sensor, a pneumatic weft gripper and a weft gripper, wherein the weft gripper grips the weft yarns, and the weft gripper grips the weft yarns so as to facilitate the weft yarns to be gripped by a follow-up rapier head;
and a second step of: the rapier stretches out and passes through the weft fixing device, after the rapier clamps the weft yarn stretching out from the weft holding device, the pneumatic weft clamping device releases the weft yarn, and the rapier resets;
and a third step of: the weft fixer fixes the weft yarn, and the rapier head releases the weft yarn;
fourth step: the reed pushes the weft yarn to the weaving port, and the weft feeding mechanism and the weft fixing device synchronously move at the moment;
fifth step: interweaving once, namely exchanging the upper layer warp yarn and the lower layer warp yarn once, and holding the current weft yarn;
sixth step: the weft fixing device releases the weft yarns, the weft yarns are sheared off by the weft yarns, and the pneumatic weft clamping device clamps the weft yarns;
seventh step: the weft feeding mechanism, the reed, the weft fixing device and the sley are retracted to the initial position together, so that one weft insertion weaving is completed;
and repeating the steps circularly until the fabric is woven.
Before the rapier releases the weft yarn, the weft yarn is fixed by a weft fixing device; the prior art does not fix the weft yarn before the rapier releases the weft yarn; the weft yarn cutting time at the weft feeding side and the weft yarn releasing time are the weft yarn warp beating-up process and are pushed to the weaving port for interweaving; the existing weft yarn cutting time at the weft feeding side is before the rapier pulls the weft yarn to pass through the shed and the beating-up starts; therefore, the weft yarn entering the shed is a continuous weft yarn in a control state, the front end is fixed by the weft fixing device, the rear end is still wound on the yarn disc, the continuous dynamic weft supply in the subsequent beating-up and interweaving process is ensured, the weft yarn entering the shed in the prior art is a section of weft yarn which is separated from the weft supplying device, the two ends of the weft yarn are in a non-control state, and the length of the weft yarn is kept unchanged in the subsequent beating-up and interweaving process.
As a preferable technical scheme:
in the rapier weft insertion method for weaving and forming the three-dimensional curved woven fabric, in the second step, the length of the weft yarn extending from the weft gripper is 0.8-1.2 cm, depending on the bending length of the weft yarn and the weft yarn scissors installation position.
The beneficial effects are that:
(1) The device of the rapier weft insertion method for weaving and forming the three-dimensional curved woven fabric comprises a weft feeding mechanism and a weft fixing device, wherein the weft feeding mechanism and the weft fixing device synchronously move along with a sley, so that the weft feeding mechanism continuously supplies weft yarns in the process of pushing the weft yarns from a shed to a weaving shed; meanwhile, the yarn disc is used as a weft accumulator, so that the phenomenon that the weft yarns are fluffed due to twisting of the weft yarns and friction between the yarns at the unwinding section and cop in the unwinding process is avoided, and the weft yarn clamping device can eliminate the possibility that the weft yarns fall off from the weft selector after weft cutting.
(2) The rapier weft insertion method for weaving and forming the three-dimensional curved woven fabric prolongs the continuous yarn feeding time and solves the problem that a large number of warp yarns are weft-removed due to insufficient weft yarn length in the three-dimensional curved forming stage.
Drawings
FIG. 1 is a schematic diagram of an implementation device of a rapier weft insertion method for weaving and forming a three-dimensional curved woven fabric;
FIG. 2 is a schematic view of a weft gripping device of the present invention;
FIG. 3 is a schematic view of the weft fastener of the present invention;
FIG. 4 is a schematic view of the yarn and the state of the components in preparation for weft insertion according to the present invention;
FIG. 5 is a schematic view of the invention drawing a weft yarn into a shed for rapier extension;
FIG. 6 is a schematic view of the invention showing the rapier releasing the yarn end after a weft yarn passes through the shed and the weft holder holding the weft yarn;
FIG. 7 is a schematic representation of the invention ready for beating up after a weft yarn is located in the shed;
FIG. 8 is a schematic illustration of the present invention showing weft yarn being beaten up to the fell;
FIG. 9 is a schematic illustration of the upper and lower warp yarn positions of the present invention exchanged once to complete interweaving with the weft yarns;
FIG. 10 is a schematic view of a weft cut-off, a gripper gripping a weft, and a holder releasing a weft after interweaving in accordance with the present invention;
FIG. 11 is a schematic view of the weft feeder-holder-sley linkage of the present invention retracted to the weft insertion position;
FIG. 12 is a schematic view of a prior art single sided rapier weft insertion device;
wherein, 1-yarn dish, 1 '-woof, 2-tension adjustment and broken weft inductor, 3-pneumatic type clamp, 3' -hold the weft ware, 4-woof is cut, 5-reed, 6-sley, 7-weft fixer, 8-rapier, 9-rapier head, 10-cheese, 11-weft selector.
Detailed Description
The invention is further described below in conjunction with the detailed description. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. Further, it is understood that various changes and modifications may be made by those skilled in the art after reading the teachings of the present invention, and such equivalents are intended to fall within the scope of the claims appended hereto.
A rapier weft insertion method for weaving and forming a three-dimensional curved woven fabric continuously supplies weft from weft insertion start to weft beating end, so that the length of weft yarn after entering a shed dynamically changes along with the weft beating process, and the method comprises the following specific processes: after weft is fed into the shed, weft is fixed on the weft receiving side by adopting a weft fixing device, the weft entering the shed and the weft feeding mechanism are kept in a connected state for beating-up, in the beating-up process, the weft feeding mechanism and the weft fixing device translate synchronously along with a sley to the plane where the weaving shed is located, and after beating-up is finished, the weft is disconnected from the weft feeding mechanism and the weft fixing device.
The implementation device of the rapier weft insertion method for weaving and forming the three-dimensional curved woven fabric comprises a weft feeding mechanism, a reed 5, a sley 6, a weft fixer 7, a rapier 8 and a rapier head 9 as shown in fig. 1 and 2;
the weft feeding mechanism, the reed 5 and the weft fixing device 7 are all rigidly connected with the sley 6;
the weft feeding mechanism comprises yarn trays 1 (the central axis of the yarn trays 1 is simultaneously perpendicular to the arrangement direction of the reed and the length direction of the reed), tension adjusting and weft breaking sensors 2, pneumatic weft grippers 3, weft grippers 3', and weft scissors 4 which are arranged at intervals in sequence;
as shown in fig. 3, the weft holder 7 is located between the weft scissors 4 and the rapier 8;
the weft fixing device 7 is located at one side of the reed 5, the weft fixing device 7 is used for fixing one end of a weft yarn section entering the shed, the pneumatic weft clamping device 3 and the weft holding device 3 'are located at the other side of the reed 5, the pneumatic weft clamping device 3 is used for clamping the other end of the weft yarn section entering the shed, and the weft holding device 3' is used for holding the other end of the weft yarn section entering the shed.
The steps of the rapier weft insertion method for weaving and forming the three-dimensional curved woven fabric by adopting the realizing device are as follows:
(1) As shown in fig. 4, a weft yarn 1' is led out from a yarn disc 1, and sequentially passes through a tension adjusting and weft breaking sensor 2, a pneumatic weft gripper 3 and a weft gripper 3', wherein the weft yarn is gripped by the pneumatic weft gripper 3, and the weft gripper 3' grips the weft yarn; wherein the length of the weft yarn extending from the weft gripper 3' is 0.8-1.2 cm;
(2) As shown in fig. 5, the rapier 8 extends out, passes through the weft fixing device 7, and after the rapier head 9 on the rapier 8 clamps the weft yarn extending out from the weft holding device 3', the pneumatic weft clamping device 3 releases the weft yarn, and the rapier 8 resets;
(3) As shown in fig. 6, the weft holder 7 holds the weft yarn and the rapier 9 releases the weft yarn;
(4) Reed 5 pushes weft yarn to fell as shown in fig. 7 and 8;
(5) Interweaving once, i.e. exchanging the upper and lower warp yarns once, holding the current weft yarn as shown in fig. 9;
(6) The weft holder 7 releases the weft yarn, the weft yarn scissors 4 cut off the weft yarn, and the pneumatic weft gripper 3 grips the weft yarn, as shown in fig. 10;
(7) The weft feeding mechanism, the reed 5, the weft fixer 7 and the sley 6 are retracted to the initial position together, so that one weft insertion weaving is completed, as shown in fig. 11;
(8) And (5) circularly repeating the steps (1) - (7) until the fabric is woven.
In order to prove that the invention can avoid the defects of selvedge warp yarn weft shedding, high yarn abrasion or uneven warp density distribution caused by the fact that the dynamic change of weft feeding length cannot be satisfied in the beating-up process, and simultaneously adopts the realization device and the single-side rapier weft insertion device in the prior art to weave the semi-cylindrical three-dimensional curved fabric with the weft curved surface radius of 15 cm;
weaving by adopting a single-side rapier weft insertion device in the prior art (as shown in fig. 12, wherein a component with the function equivalent to that of a yarn disc 1 of the invention is a cheese 10, a component with the function equivalent to that of a pneumatic weft gripper 3 and a weft gripper 3' of the invention is a weft selector 11), designing the weaving reed threading width according to the plane projection width of a three-dimensional curved fabric when weaving, wherein the curved surface width (namely, the half perimeter of a cylinder curved surface) of the fabric to be woven is 47.25cm, and the plane projection weft width (namely, the width) is 30cm; since the lower draw-down rate is 2%, the upper reed width is 30.61cm, the length of the weft yarn section inserted into the shed is 30.61cm at the time of weft insertion, and the missing weft yarn length is 17.60cm when the weft yarn is pushed to the weaving shed to form a curved surface (the upper curved surface width is 48.21cm after considering the lower draw-down rate of 2%).
When the realization device is adopted for weaving, the weaving reed penetrating width is designed according to the plane projection width of the three-dimensional curved fabric during weaving, the curved surface width (namely, the half perimeter of the curved surface of the cylinder) of the fabric to be woven is 47.25cm, and the plane projection weft width (namely, the width) is 30cm; in the process of pushing the weft yarn from the shed to the weaving shed, as the weft yarn end on the rapier side is fixed, the weft yarn on the yarn disc end is only in a holding state, the yarn disc continuously supplies weft yarn, and if the distance from the edge warp yarn to the rapier head and the weft yarn scissors is considered to be 5cm, the weft yarn is cut by the weft yarn scissors after the length of the weft yarn reaches 58.21 cm. For a shuttle loom, in order to continuously supply 17.6cm of weft, yarns stored in a static shuttle at one side of the loom are pulled out under the action of weft tension in a shed, and the weft tension is derived from the last weft which is held by interweaving and folds around selvedge warp, so that according to the basic principle of the shuttle loom, the interweaved weft and warp are subjected to relative sliding under the action of the weft tension to increase abrasion, and simultaneously the selvedge warp supporting the folding of the weft is sequentially subjected to bending sliding to different degrees towards the central area of a cloth body under the action of the weft tension, so that the situation that the center of the cloth edge warp density Xiang Bu body is changed from large to small is formed.
Claims (8)
1. A rapier weft insertion method for weaving and forming a three-dimensional curved woven fabric is characterized in that weft is continuously fed from weft insertion start to weft beating end, so that the length of weft yarn after entering a shed dynamically changes along with the weft beating process.
2. The rapier weft insertion method for weaving and forming the three-dimensional curved woven fabric according to claim 1, which is characterized by comprising the following specific processes: after weft is fed into a shed, weft is fixed on the weft receiving side by adopting a weft fixing device (7), the weft entering the shed and the weft feeding mechanism are kept in a connected state for beating-up, the weft feeding mechanism and the weft fixing device (7) translate to the plane of a weaving port along with a sley (6) synchronously in the beating-up process, and after beating-up is finished, the weft is disconnected from the weft feeding mechanism and the weft fixing device (7) simultaneously.
3. A device for realizing the rapier weft insertion method for weaving and forming the three-dimensional curved woven fabric according to claim 2, which comprises a weft feeding mechanism, a reed (5), a sley (6), a rapier (8) and a rapier head (9), wherein the weft feeding mechanism comprises weft storages, weft clamping devices and weft scissors (4) which are sequentially arranged at intervals, and is characterized in that the device also comprises weft fixing devices (7) positioned between the weft scissors (4) and the rapier (8);
the weft fixing device (7) and the weft clamping device are positioned at two sides of the reed (5); the weft fixer (7) is used for fixing one end of the weft yarn section entering the shed, and the weft yarn clamping device is used for clamping and holding the other end of the weft yarn section entering the shed;
the weft feeding mechanism, the reed (5) and the weft fixing device (7) are all rigidly connected with the sley (6).
4. A device according to claim 3, characterized in that the weft accumulator is a yarn disc (1), the central axis of the yarn disc (1) being perpendicular to both the reed arrangement direction and the reed length direction.
5. Device according to claim 3 or 4, characterized in that the weft thread gripping means consist of a pneumatic gripper (3) and a gripper (3 '), the gripper (3 ') being located between the pneumatic gripper (3) and the weft thread shears (4), the pneumatic gripper (3) being intended to grip the other end of the weft thread segment entering the shed, the gripper (3 ') being intended to grip the other end of the weft thread segment entering the shed.
6. Device according to claim 5, characterized in that the weft feeding mechanism further comprises a tension adjustment and weft break sensor (2) between the weft accumulator and the weft gripping device.
7. A rapier weft insertion method for weaving and forming a three-dimensional curved woven fabric by using the device according to claim 6, comprising the steps of:
the first step: leading out weft yarns from the weft accumulator, sequentially passing through a tension adjusting and weft breaking sensor (2), a pneumatic weft gripper (3) and a weft gripper (3 '), wherein the weft yarns are gripped by the pneumatic weft gripper (3) and the weft gripper (3');
and a second step of: the rapier (8) stretches out, passes through the weft fixing device (7), and after the rapier head (9) on the rapier (8) clamps the weft yarn stretching out of the weft holding device (3'), the pneumatic weft clamping device (3) releases the weft yarn, and the rapier (8) resets;
and a third step of: weft fixing devices (7) fix weft yarns, and rapier heads (9) release the weft yarns;
fourth step: the reed (5) pushes the weft yarn to the fell;
fifth step: interweaving once, namely exchanging the upper layer warp yarn and the lower layer warp yarn once, and holding the current weft yarn;
sixth step: weft yarn is released by the weft fixer (7), the weft yarn is cut off by the weft yarn scissors (4), and the weft yarn is clamped by the pneumatic weft clamper (3);
seventh step: the weft feeding mechanism, the reed (5), the weft fixer (7) and the sley (6) are retracted to the initial position together;
and repeating the steps circularly until the fabric is woven.
8. The method for inserting rapier loom woven with three-dimensional curved surface according to claim 7, characterized in that, in the second step, the length of the weft yarn protruding from the gripper (3') is 0.8-1.2 cm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410179159.8A CN117845403A (en) | 2024-02-18 | 2024-02-18 | Rapier weft insertion method for weaving and forming three-dimensional curved woven fabric and implementation device |
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| CN202410179159.8A CN117845403A (en) | 2024-02-18 | 2024-02-18 | Rapier weft insertion method for weaving and forming three-dimensional curved woven fabric and implementation device |
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