JP2015151640A - Weft insertion method and weft running accelerator fitting device in air-jet loom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make weaving possible even if monofilament yarn or metallic fiber is used as weft in an air-jet loom.SOLUTION: Weft insertion is performed in a state that a running accelerator 41 in which a surface area per unit weight is larger than that of weft Y is fitted to the tip of the weft Y with respect to the weft Y before weft insertion. The running accelerator 41 has a tape-like form. The running accelerator 41 is fitted to the tip of the weft Y by heat welding while surrounding the weft Y.

Description

  The present invention relates to a weft insertion method and a weft flying promotion body mounting apparatus in an air jet loom.

In recent years, many air jet looms have been used for the purpose of increasing the weaving speed and improving the weaving efficiency.
Air jet looms are weaving machines in which wefts are conveyed by a high-pressure nozzle jet, and weft paths are used when monofilament yarns or metal fibers with very low air friction resistance are used as weft yarns. It was impossible to weave because it was not possible to fly inside the weaving width. In addition, when flat yarns or strong twisted yarns made of multifilament yarns with low air friction resistance or hemp yarns with high fiber rigidity are used as wefts, compared to spun yarns made by twisting thin short fibers together Has the disadvantages that the weft does not fly at a sufficient speed, the loom stops frequently, and the air consumption increases remarkably.

  A weft insertion apparatus and a weft insertion method for removing these defects have been proposed (see, for example, Patent Document 1 and Patent Document 2). In Patent Document 1, before injecting the fluid (air or water) for the weft, a spherical solid substance having a dozen times the weft diameter is adhered to the weft, and the weft is inserted by injecting the fluid to the solid. Weft insertion devices have been proposed. In Patent Document 2, in a weaving machine in which wefts are put on a jet fluid, the weft ends of the wefts that are within the length of the abandoned ears are deformed, such as bent, from the front ends of the wefts before weft insertion. There has been proposed a weft insertion method for increasing the propulsive force received from the jet fluid.

JP-A-51-92352 JP 58-163758 A

  However, as in Patent Document 1, when a spherical solid having ten times the weft diameter is bonded to the weft, the portion to which the spherical solid is bonded per unit length compared to other portions of the weft to be inserted. This increases the weight of the machine and hinders the weft from flying straight. In the case of Patent Document 2, it is possible to increase the yarn propulsion force at the time of weft flight compared to a straight weft by deforming the tip of the weft. However, monofilament yarns with extremely low air friction resistance, yarns such as metal fibers, or flat yarns with low air friction resistance compared to span yarns or strong twisted yarns, etc., can secure the yarn propulsion force when wefts fly. It is difficult to reduce the required air consumption.

  The present invention has been made in view of the above problems, and its purpose is to be able to weave even when monofilament yarn, metal fiber or the like is used as a weft, such as flat yarn, high twist yarn or hemp yarn. An object is to provide a weft insertion method and a weft flying promotion body mounting device in an air jet loom capable of reducing the air consumption even when weaving.

  The method of weft insertion in an air jet loom that solves the above-mentioned problem is that weft insertion is performed in a state in which a flying promoting body having a surface area per unit weight larger than that of the weft is attached to the front end of the weft before the weft. I do.

  According to this configuration, since the weft is inserted in a state in which the travel promoting body having a larger surface area per unit weight than that of the weft is attached to the tip portion, the weft is compared to Patent Document 1 and Patent Document 2. The yarn propulsion force applied to the weft yarn through the promotion body is increased. Therefore, weaving is possible even when monofilament yarn, metal fiber, or the like is used for the weft, and even flat yarn, high twist yarn or hemp yarn can be woven with reduced air consumption.

  An apparatus for attaching a weft flying acceleration body in an air jet loom that solves the above problems attaches a traveling acceleration body having a surface area per unit weight larger than that of the weft yarn to the front end portion of the weft yarn before weft insertion. . According to this configuration, the weft can be woven even when monofilament yarn or metal fiber is used for the weft, the flying propulsion force is increased via the flying accelerator during weft insertion, Even flat yarn, strong twisted yarn or hemp yarn can be woven with reduced air consumption.

  The flight promoting body is preferably in the form of a tape. Here, the “tape shape” means a flat state whose width is several tens of times larger than the thickness. According to this configuration, it is possible to easily obtain a flight promoting body having a surface area per unit weight larger than that of the weft. Further, for example, if the flight promoting body wound around the reel is intermittently paid out from the reel and cut into a predetermined length and used, the flight promoting body can be easily stored and handled.

  The flight promoting body is preferably a splitting yarn. According to this configuration, the surface area per unit weight is larger than that of the tape-like flying promoting body, and the yarn propulsion force required when the weft is flying can be ensured with a small amount of air consumption.

  It is preferable that the flying promotion body is attached to the front end of the weft by heat welding in a state where the weft is wrapped. According to this configuration, the travel promoting bodies are welded in a state where they are entangled with each other in the weft, and the travel promoting bodies are not separated from the weft during the weft insertion, so that stable weft insertion is possible.

  It is preferable that the flying promoting body is attached to the weft between the main nozzle of the air jet loom and the weft cutter. It is also possible to attach the flying promotion body to the weft in a state before the weft is supplied to the main nozzle. However, in this case, the length of the weft serving as a discarding ear is at least the length of the main nozzle. . However, the length of the weft serving as a waste ear can be reduced by mounting the flying promotion body on the weft between the main nozzle and the weft cutter.

  It is preferable that the flying promoting body is attached to the weft yarn between a tandem nozzle and a main nozzle of an air jet loom. According to this configuration, there is no weft swing when attaching the travel promoting body to the weft, compared to the case where the travel promoting body is attached to the weft on the weft insertion side from the tip of the main nozzle. In addition, since the weft rest time is long, it is possible to take a long time to attach the flying promotion body to the weft during one rotation of the loom, and it is possible to cope with the high speed of the loom.

  According to the present invention, weaving is possible even when monofilament yarn, metal fiber, or the like is used for weft, and weaving can be performed with reduced air consumption even with flat yarn, strong twisted yarn or hemp yarn. .

The schematic perspective view of the air jet loom explaining 1st Embodiment. The sectional side view which shows the positional relationship of a wing and a sub nozzle. Schematic which shows the supply path | route of the compressed air to each nozzle. The schematic perspective view of the weft in which the flying promotion body was welded to the front-end | tip part. The partially broken schematic front view which shows the structure of a weft flying promotion body mounting apparatus. The partially broken schematic front view which shows the effect | action of a weft flying promotion body mounting apparatus. The partially broken schematic front view which shows the effect | action of a weft flying promotion body mounting apparatus. The schematic front view which shows the state of the weft and the flying promotion body at the time of the weft insertion start. The schematic perspective view explaining the weft travel promoting body mounting apparatus of 2nd Embodiment. Schematic explaining a weft flying promotion body mounting apparatus. Schematic of the weft in which the flying promoting body is welded to the tip. The figure which shows the relationship between the surface area of a flying promotion body, and the weft propulsion force by the sub nozzle in a deformation hook path. The figure which shows the relationship between the weight of a flight promotion body, and the ease of flying of a weft. The schematic perspective view explaining the weft flying promoting body mounting apparatus of 3rd Embodiment.

(First embodiment)
A first embodiment of the present invention will be described below with reference to FIGS.
As shown in FIG. 1, the air jet loom includes two sets of main nozzles 11A and 11B for weft insertion as weft insertion devices, and tandem nozzles 12A and 12B disposed on the upstream side of the main nozzles 11A and 11B. And a plurality of weft insertion sub-nozzles 13 disposed downstream of the main nozzles 11A and 11B. The tandem nozzles 12A and 12B are disposed in a state of being fixed to a frame or a bracket attached to the floor surface of the air jet loom.

  The main nozzles 11A and 11B and the sub-nozzle 13 are disposed on a slay 15 that is fixed to a swing shaft 14 and reciprocally swings in the front-rear direction of the air jet loom. A deformation rod 16 is fixed on the sley 15. The deformed kite 16 is configured by arranging a plurality of kites 17 in the weft insertion direction. As shown in FIG. 2, a guide inner passage 18 serving as a weft insertion route for the weft Y is formed by the guide recesses 17 a of the plurality of guide wings 17. The sub nozzle 13 is disposed along the weft insertion path in a state where the tip portion faces the guide concave portion 17 a of the wing 17. In FIG. 1, a part of the wing 17 is omitted.

  As shown in FIG. 3, the main nozzle 11A has a switching valve 19A, the main nozzle 11B has a switching valve 19B, the tandem nozzle 12A has a switching valve 20A, and the tandem nozzle 12B has a switching valve 20B. It is connected. Each switching valve 19A, 19B, 20A, 20B is connected to the main tank 23 by a common pipe 22. Each switching valve 19A, 19B, 20A, 20B is controlled by a control device (not shown), and the injection timing of the compressed air from the main nozzles 11A, 11B and the tandem nozzles 12A, 12B is controlled. In this embodiment, each switching valve 19A, 19B, 20A, 20B is controlled so that the weft insertion by the main nozzle 11A and the tandem nozzle 12A and the weft insertion by the main nozzle 11B and the tandem nozzle 12B are alternately performed. It is like that.

  A switching valve 24 is connected to each sub nozzle 13 by a pipe 25a, and each switching valve 24 is connected to a sub tank 26 by a common pipe 25b. Each switching valve 24 is controlled by a control device (not shown), and is controlled to open and close like a relay at a predetermined timing during weft insertion so that compressed air is relay-injected from the sub nozzle 13.

  As shown in FIG. 1, drum-type weft storage devices 27A and 27B are disposed upstream of the tandem nozzles 12A and 12B. Each of the weft storage devices 27A and 27B includes a weft winding pipe 28, and winds and stores the weft Y supplied to the weft winding pipe 28 from a yarn supply unit (not shown) around a length measuring drum 29. Each weft storage device 27 </ b> A, 27 </ b> B has a locking pin 30 that can be separated from and connected to the length measuring drum 29. The locking pin 30 is actuated from the state of being locked to the measuring drum 29 at the start of weft unwinding to the separated state, and the weft Y wound around the measuring drum 29 is an amount corresponding to the weft insertion yarn length. When unwound, the locking pin 30 that is in a separated state with respect to the length measuring drum 29 is locked with the length measuring drum 29 and is prevented from being unwound.

  A weft brake 31 is provided between the tandem nozzles 12A and 12B and the weft storage devices 27A and 27B. The weft brake 31 extends between the weft guide 32 that guides the weft Y supplied from the weft storage devices 27A and 27B to the tandem nozzles 12A and 12B, and the weft introduction port 33 of the tandem nozzles 12A and 12B. A pair of locking bars 34a, 34b that can be locked to the weft Y are provided. The locking bars 34 a and 34 b are moved to a movement allowable position that allows the movement of the weft Y and a restriction position that restricts the movement of the weft Y.

  On the weft insertion side before weaving of the air jet loom, a weft cutter 36 is provided for cutting the weft Y that has been inserted and beaten by the deformed kite 16 on the side closer to the main nozzles 11A and 11B of the woven fabric W. . Between the main nozzles 11 </ b> A and 11 </ b> B and the weft cutter 36, a weft run promoting body mounting device 40 is provided. The weft travel promoting body mounting device 40 mounts a travel promoting body 41 having a larger surface area per unit weight than the weft Y to the front end of the weft Y before the weft Y before weft insertion.

  As shown in FIG. 4, in this embodiment, the flight promoting body 41 has a tape shape, and for example, a flat yarn 42 made of a nonwoven fabric and having minute unevenness on the surface is used. The tape shape means a flat state whose width is several tens of times larger than the thickness. The flying promotion body 41 is thermally welded to the distal end portion of the weft Y in a state where the two flat yarns 42 sandwich the weft Y and the base end side is the weld portion 43. That is, the flying promotion body 41 is attached to the tip of the weft Y by heat welding in a state where the weft Y is wrapped. The flat yarn 42 is formed of a thermoplastic resin having a relatively low melting temperature.

  As shown in FIG. 5, the weft travel promoting body mounting device 40 includes a travel facilitator guide member 44a disposed so as to face the top and bottom in a state of sandwiching the travel path of the weft Y inserted from the main nozzles 11A and 11B. , 44b. Both flying promotion body guide members 44a and 44b are provided such that the distance between the opposing surfaces is substantially the same as the outer diameter of the acceleration pipe 35 of the main nozzles 11A and 11B. In addition, as shown in FIG. 1, the flight promoting body guide members 44a and 44b constitute a part of one member having a U-shaped cross section.

  Above the flying promotion body guide member 44a arranged on the upper side, a flat yarn supply part 45a and a guide base 46a for guiding the flat yarn 42 supplied from the flat yarn supply part 45a to the traveling promotion body guide member 44a. And a feed roller 47a. Near the weft cutter 36 of the flying promotion body guide member 44a, a guide groove for guiding the flat yarn 42 supplied from the flat yarn supply section 45a to the opposite weft cutter side of the clearance between the flying promotion body guide members 44a and 44b. 48a is formed.

  Below the travel promoting body guide member 44b disposed on the lower side, a flat yarn supply unit 45b and a guide base for guiding the flat yarn 42 supplied from the flat yarn supply unit 45b to the travel promotion body guide member 44b. 46b and a feed roller 47b are provided. The flat yarn supply units 45a and 45b are configured such that the flat yarn 42 is wound around a reel. Near the weft cutter 36 of the flying promotion body guide member 44a, a guide groove for guiding the flat yarn 42 supplied from the flat yarn supply section 45a to the opposite weft cutter side of the clearance between the flying promotion body guide members 44a and 44b. 48b is formed.

  A cutter 49a for cutting the flat yarn 42 guided by the guide groove 48a is provided at a position close to the upper surface of the flying promotion body guide member 44a. The cutter 49a heat-cuts the flat yarn 42. A cutter 49b for cutting the flat yarn 42 guided by the guide groove 48b is provided at a position close to the lower surface of the flying promotion body guide member 44b. The cutter 49b heat-cuts the flat yarn 42.

  A heater 50 is provided on the anti-weft cutter side of the travel promoting body guide member 44b disposed on the lower side so that a part thereof is exposed on the upper surface of the travel promotion body guide member 44b. The flight facilitator guide member 44 a disposed on the upper side is cut away at a portion facing the heater 50. Above the flight promoting body guide member 44a, the air cylinder 51 extends in the vertical direction, and is provided at a position where the tip surface of the piston rod 51a presses the upper surface of the heater 50 when the piston rod 51a protrudes. . The front end surface of the piston rod 51 a is formed in a shape capable of pressing the entire width direction of both flat yarns 42 arranged with the weft Y sandwiched between the upper surface of the heater 50.

Next, the operation of the weft flying promotion body mounting device 40 configured as described above and the weft insertion operation of the air jet loom will be described.
Both flat yarns 42 supplied from the flat yarn supply parts 45a and 45b are in a standby state in which the tip faces the ends of the guide grooves 48a and 48b. The weft travel promoting body mounting device 40 is configured so that the feed rollers 47a and 47b are driven and the flat yarns 42 from the flat yarn supply portions 45a and 45b in a state where the weft Y is not between the travel promoting body guide members 44a and 44b. 5 is arranged in a state shown in FIG. 5 in which the leading end passes through the guide grooves 48a and 48b and becomes the end portion on the side opposite to the weft cutter of the flying promotion body guide members 44a and 44b. In this state, the tip portions of both flat yarns 42 are in a state corresponding to the heater 50. The tip of the flat yarn 42 on the flying facilitator guide member 44a side is held so as not to hang down by a suction device (not shown).

  In this state, when the previous weft insertion is completed and the main nozzle 11A and the deformed scissors 16 swing with the sley 15 and move to the scissor point, as shown in FIG. It will be in the state pinched | interposed into both the flat yarns 42 between the driving | running | working promotion body guide members 44a and 44b. At this time, as shown in FIG. 6, the air cylinder 51 is driven, the piston rod 51a is lowered, and the weft Y is sandwiched between the two upper and lower flat yarns 42. After being melted, the flying promotion body 41 is attached to the tip of the weft Y by heat welding in a state where the weft Y is wrapped. Further, when both the cutters 49a, 49b are heated, the cutters 49a, 49b are moved to positions where they come into contact with the flat yarns 42 in the vicinity of the inlets of the guide grooves 48a, 48b of the flying promotion body guide members 44a, 44b. , 49b are each melt cut (heat cut) to a predetermined length.

  Thereafter, the air cylinder 51 is driven, and the piston rod 51a returns to the original standby position as shown in FIG. Further, the weft Y having the travel promoting body 41 attached to the tip is pulled back by the weft brake 31 on the upstream side of the tandem nozzle 12A, and the travel promoting body 41 is temporarily inserted into the acceleration pipe 35 of the main nozzle 11A. Is done. In this state, the system waits until the next weft insertion timing by the main nozzle 11A and the tandem nozzle 12A.

  When one weft insertion by the main nozzle 11A and the tandem nozzle 12A is completed, the weft insertion by the main nozzle 11B and the tandem nozzle 12B is performed. The weft storage device 27A for the main nozzle 11A and the tandem nozzle 12A stores the weft Y having a length necessary for the next weft insertion while the weft insertion by the main nozzle 11B and the tandem nozzle 12B is performed.

  In this state, when the next weft insertion start timing is reached, the locking pin 30 of the weft storage device 27A is actuated from the locked state to the measuring drum 29, and the weft brake 31 is moved to the weft Y. The compressed air is ejected from the main nozzle 11A and the tandem nozzle 12A at the same time. Then, as shown in FIG. 8, the weft Y having the travel promoting body 41 attached to the tip portion travels on the jet air flow into the inner passage 18 of the deformed kite 16 and travels from the sub nozzle 13 to the relay. It is conveyed to the end of the woven fabric W on the side opposite to the weft insertion side by the jetted compressed air. The portion of the weft Y on which the travel promoting body 41 is mounted is cut off from the woven fabric W as a waste ear (not shown).

  In the case where the weft insertion by the main nozzle 11B and the tandem nozzle 12B is completed, the flying promotion body 41 is attached to the tip of the weft Y in the same manner as the weft insertion by the main nozzle 11A and the tandem nozzle 12A. The weft Y is pulled back, and the flying promotion body 41 is temporarily inserted into the acceleration pipe 35 of the main nozzle 11B.

  In the same manner, the weft insertion by the main nozzle 11A and the tandem nozzle 12A and the attachment of the travel promoting body 41 to the tip of the weft Y, and the weft insertion by the main nozzle 11B and the tandem nozzle 12B and the weft of the travel promotion body 41 are performed. The woven fabric W is woven by alternately repeating the attachment of Y to the tip.

  Before starting the operation of the air jet loom, the front end of the weft Y inserted by the main nozzle 11A and the tandem nozzle 12A and the front end of the weft Y inserted by the main nozzle 11B and the tandem nozzle 12B The worker carries out the mounting work of the flying promotion body 41.

According to this embodiment, the following effects can be obtained.
(1) The weft insertion method in the air jet loom is that weft insertion is performed in a state in which the flying acceleration body 41 having a larger surface area per unit weight than the weft Y is attached to the front end of the weft Y with respect to the weft Y before weft insertion. I do. Therefore, as compared with Patent Document 1 and Patent Document 2, the yarn propulsion force applied to the weft Y via the flying promotion body 41 is increased. As a result, weaving is possible even when monofilament yarn, metal fiber, or the like is used for the weft Y, and even flat yarn, strong twist yarn or hemp yarn can be woven with reduced air consumption.

  (2) The weft flying acceleration body attaching device 40 in the air jet loom attaches the flying acceleration body 41 having a larger surface area per unit weight to the weft Y before weft insertion than the weft Y at the tip of the weft Y. To do. According to this configuration, the weft Y has a flying propulsion force increased via the flying accelerator 41 during weft insertion, and can be woven even when monofilament yarn, metal fiber, or the like is used for the weft. Therefore, even flat yarn, strong twisted yarn or hemp yarn can be woven with reduced air consumption.

  (3) The flight promoting body 41 has a tape shape. According to this structure, the flying promotion body 41 whose surface area per unit weight is larger than the weft Y can be obtained easily. Further, if the travel promoting body 41 wound around the reel is intermittently paid out from the reel and cut into a predetermined length and used, the travel promoting body 41 can be easily stored and handled.

  (4) The flying promotion body 41 is attached to the tip of the weft Y by thermal welding in a state where the weft Y is wrapped. According to this configuration, unlike the case where one flat yarn 42 is thermally welded from one side of the weft Y, the flying promotion bodies 41 are welded in a state where they are entangled with the weft Y, and fly in the middle of weft insertion. Stable weft insertion is possible without the travel promoting body 41 separating from the weft Y.

  (5) The weft travel promoting body mounting device 40 intermittently unwinds the flat yarn 42 wound around the reel constituting the flat yarn supply portions 45a and 45b from the reel, and makes the cutter 49a and 49b have a predetermined length. Cut and use. Therefore, storage and handling of the flying promotion body 41 are facilitated.

  (6) The weft travel promoting body mounting device 40 mounts the travel promoting body 41 on the weft Y between the main nozzles 11A and 11B of the air jet loom and the weft cutter 36. Therefore, the length of the weft Y that becomes a waste ear can be reduced as compared with the case where the flying promotion body 41 is attached to the weft Y before the weft Y is supplied to the main nozzles 11A and 11B.

(7) The cutters 49a and 49b heat-cut each flat yarn 42. Therefore, compared with the structure cut | disconnected with a cutter, it can cut reliably at high speed with a simple structure.
(8) After the flying acceleration body 41 is attached to the tip of the weft Y, the weft Y is pulled back by the weft brake 31, and the flying acceleration body 41 is temporarily inserted into the acceleration pipe 35 of the main nozzles 11A and 11B. Therefore, the weft propulsion force at the time of compressed air injection from the main nozzles 11A and 11B is greatly increased by the effect of the air gun, and high-speed weft insertion is possible.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIGS. This embodiment is different from the first embodiment in that a flying accelerating body 41 that is obtained by dividing a processed yarn composed of a plurality of filaments is used. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 9, the weft run promoting body mounting device 40 includes a yarn bobbin 56 around which a work yarn 55 made of a plurality of filaments is wound and a work yarn 55 supplied from the yarn bobbin 56. The separating device 57 is provided on both upper and lower sides in a state of sandwiching the travel path of the weft Y inserted from the main nozzles 11A and 11B. In FIG. 9, the illustration of the yarn bobbin 56 and the electrostatic separation device 57 located on the upper side across the flying path of the weft Y is omitted.

  A block body 58 is provided below the travel path of the weft Y between the main nozzles 11A, 11B and the weft cutter 36, and the heater 50 is provided on the block body 58 so as to be exposed on the upper surface thereof. . Between the electrostatic separation device 57 and the block body 58 arranged on the lower side, a guide base 60b and a feed roller for guiding the divided yarn 59 separated by the electrostatic separation device 57 to the upper surface of the block body 58 61b is provided. The block body 58 is formed so that the guide base 60b side is longer than the exposed surface of the heater 50, and the split fiber 59 having a necessary length constituting the flying promotion body 41 can be placed on the upper surface of the block body 58. Yes. The block body 58, the guide base 60b, the feed roller 61b, and the electrostatic separating device 57 are arranged such that the separating yarn 59 extends obliquely with respect to the weft Y. Further, the processed yarn 55 is supplied to the electrostatic separating device 57 from an oblique direction with respect to the extending direction of the separating yarn 59 so that the yarn bobbin 56 does not interfere with the woven fabric W.

  Above the block body 58, an electromagnetic solenoid 62 is provided in a state where the push rod 62 a extends in the vertical direction, and a position where the tip end surface of the push rod 62 a presses the upper surface of the heater 50 when the push rod 62 a protrudes. Yes. The front end surface of the push rod 62 a is formed in a shape capable of pressing the entire width direction on the front end side of both split yarns 59 arranged with the weft Y sandwiched between the upper surface of the heater 50.

  A split yarn cutter 64 is fixed to the push rod 62a via a support member 63. The split yarn cutter 64 is a guide base for the split yarn 59 from the block body 58 in a state where the split yarn 59 with the weft Y sandwiched between the block body 58 is pressed against the block body 58 by the push rod 62a. Heat cut on the 60b side.

  Between the electrostatic separation device 57 and the block body 58 arranged on the upper side, a guide base 60a and a feed roller 61a for guiding the separation yarn 59 separated by the electrostatic separation device 57 to above the block body 58. Is provided. As shown in FIG. 10, the guide base 60a and the feed roller 61a are provided in parallel with the guide base 60b and the feed roller 61b, and the upper split yarn 59 and the lower split yarn 59 are jointed to the guide base 60a. Thus, a guide member 65 is provided for guiding the weft Y to the state where it is sandwiched.

  In the weft run promoting body mounting device 40 of this embodiment, the processed yarn 55 supplied from the yarn bobbin 56 is separated by the electrostatic separation device 57 by the action of static electricity and spreads in a fluffy cotton shape containing a large amount of air layer. In this state, the splitting yarn 59 is obtained. Both split yarns 59 are fed onto the block body 58 by the feed rollers 61a and 61b, and the tip of the split yarn 59 is set in a state corresponding to the back side of the heater 50. Note that the tip of the upper splitting yarn 59 is held by a suction device (not shown) so as not to hang down.

  Then, when the last weft insertion is completed and the main nozzle 11A and the deformed scissors 16 swing with the sley 15 and move to the striking point, as shown in FIG. The state is sandwiched between the threads 59. At this time, the electromagnetic solenoid 62 is driven, the push rod 62a and the split yarn cutter 64 are simultaneously lowered, and the tip of the split yarn 59 is the heater while the weft Y is sandwiched between the upper and lower split yarns 59. 50, and further heat-cut to a predetermined length by the split yarn cutter 64 on the guide base 60b side from the block body 58. As a result, as shown in FIG. 11, the flying promotion body 41 is attached to the tip of the weft Y by thermal welding in a state where the weft Y is wrapped.

  Thereafter, the push rod 62a and the split yarn cutter 64 return upward. In addition, the weft Y having the travel promoting body 41 attached to the tip is pulled back by the weft brake 31 on the upstream side of the tandem nozzle 12A, and the travel promoting body 41 is inserted into the acceleration pipe 35 of the main nozzle 11A. The The split yarn 59 is not welded to the weft Y in a state extending parallel to the longitudinal direction of the weft Y. However, since the split yarn 59 has low fiber rigidity, the flying promotion body 41 has the weld portion 43. Is inserted in the accelerating tube 35 of the main nozzle 11 </ b> A so as to face the weft traveling direction so that the opposite side is the front end side of the weft Y.

  Next, when the weft insertion start timing is reached, the locking pin 30 of the weft storage device 27A is actuated from the locked state to the measuring drum 29, and the weft brake 31 moves the weft Y. At the same time, the compressed air is injected from the main nozzle 11A and the tandem nozzle 12A. The weft Y having the flying promotion body 41 attached to the tip portion travels in the yarn flying path of the deformed kite 16 by the jet air flow and is woven by the compressed air that is relay-injected from the sub nozzle 13. The cloth W is conveyed to the opposite end of the weft insertion side.

  Thereafter, the woven fabric W is woven in the same manner by repeating from the attachment of the flying promotion body 41 to the tip of the weft Y to the weft insertion.

  With respect to various wefts, the relationship between the surface area and the propulsive force by the sub nozzle 13 in the rod inner passage 18 when the flying promoters of the first embodiment and the second embodiment having different shapes and materials were mounted was examined. . The results are shown in FIG. In addition, the relationship between the weight of the flying accelerator and the ease of weft flying in the deformed kite passage was investigated. The results are shown in FIG.

  Table 1 shows the shape, material, weight, surface area, and surface area per weight of the flying accelerator used. Types of weft (material, thickness), weight per 1800 mm of yarn length, surface area, surface area per weight, apparent The diameter is shown in Table 2.

As shown in FIG. 12, it can be seen that the propulsive force acting on the weft Y increases in proportion to the surface area A of the flying accelerator 41. In addition, it has been clarified through experiments that the surface area required for use as the flying accelerator 41 is preferably 100 mm ² or more. When the surface area of the flying promotion body 41 is smaller than 100 mm ² , the surface area is too small and the effect of improving the yarn driving force is small, the weaving property is lowered, and the effect of reducing the air consumption is reduced.

  As shown in FIG. 13, it can be seen that the ease of flying of the weft Y is easier to fly as the weight of the flying promotion body 41 is lighter. Moreover, it became clear by experiment that the weight required when using as the flight promoting body 41 is preferably 20 mg or less. When the weight of the flying promotion body 41 is heavier than 20 mg, the weight of the tip of the weft Y is too heavy, and the flying speed of the tip of the weft Y is slower than the flying speed of the weft Y behind the tip. There is, and the effect by having mounted the traveling promotion body 41 cannot fully be demonstrated.

According to this embodiment, in addition to the effects similar to the effects described in (1), (2), (4) to (8) of the first embodiment, the following effects can be obtained.
(9) The flying promotion body 41 is constituted by a split yarn 59 obtained by splitting the processed yarn 55. According to this configuration, the surface area per unit weight is greater than that of the tape-like travel promoting body 41, and the yarn propulsion force required when the weft Y travels can be ensured with less air consumption.

(Third embodiment)
Next, a third embodiment will be described with reference to FIG. This embodiment is different from the first embodiment in that the flying promotion body 41 is attached to the weft Y between the tandem nozzles 12A and 12B and the main nozzles 11A and 11B. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 14, the weft travel promoting body mounting device 40 is provided at the tip of each tandem nozzle 12A, 12B. The main nozzles 11A and 11B have a shorter overall length than that of the first embodiment by shortening the accelerating tube 35, and the inner diameter of the thread guide 37 is increased so as not to hinder the traveling of the flying accelerator 41. To do.

According to the configuration of this embodiment, the following effects can be obtained in addition to the effects similar to the effects described in (1) to (5) and (7) to (8) of the first embodiment.
(10) Compared to the case where the travel promoting body 41 is attached to the weft Y on the weft insertion side with respect to the front ends of the main nozzles 11A and 11B, the weft Y is attached to the weft Y when the travel promoting body 41 is attached. There is no rocking and the weft rest time is long. Therefore, it is possible to take a longer time to attach the flying promotion body 41 to the weft Y during one rotation of the loom, and it is possible to cope with a higher speed of the loom.

The embodiment is not limited to the above, and may be embodied as follows, for example.
In the first and second embodiments, after the travel promoting body 41 is attached to the tip of the weft Y, the weft Y is pulled back and the travel promoting body 41 is inserted into the acceleration pipe 35 of the main nozzles 11A and 11B. Instead, the compressed air may be injected from the main nozzles 11A and 11B. However, when the flying promotion body 41 is inserted into the acceleration pipe 35 of the main nozzles 11A and 11B, the weft propulsion force at the time of compressed air injection of the main nozzles 11A and 11B is greatly increased due to the effect of the air gun. Reduction of compressed air consumption and high-speed weft insertion are possible.

  The two sets of main nozzles 11A and 11B and the tandem nozzles 12A and 12B do not alternately weft the same type of weft Y, but may alternately weft different types of weft Y. Further, different types or the same type of weft Y may be randomly inserted.

  The air jet loom is not limited to a configuration including two sets of main nozzles 11A and 11B and tandem nozzles 12A and 12B, and may be configured to include a set of main nozzles 11A and tandem nozzles 12A.

The cutters 49a and 49b and the split yarn cutter 64 are not limited to the configuration in which the flat yarn 42 and the split yarn 59 are cut by heat cutting, but may be cut by a blade.
○ As in the second embodiment, instead of attaching the processed yarn 55 composed of a plurality of filaments to the weft Y by using the electrostatic separating device 57 to separate the processed yarn 55 by electrostatic force, the processed yarn 55 is processed in advance. A split yarn 59 in a state where the yarn 55 is split may be used. In this case, it is not necessary to provide the electrostatic separation device 57 in the weft flying promotion body mounting device 40.

  ○ In order to configure the flying promotion body 41, the flying promotion body 41 is made of the weft Y by using the flat yarn 42 and the processed yarn 55 having a length corresponding to a plurality of the flying promotion bodies 41 having a predetermined length. Instead of cutting to a predetermined length after being attached to the distal end, a flight promoting body 41 that has been cut to a predetermined length in advance may be used. In this case, the cutters 49a and 49b and the split yarn cutter 64 are not necessary.

The flying promotion body 41 may be welded in a state in which the tip of the weft Y is sandwiched between the flat yarn 42 and the split yarn 59.
O The mounting method of the flying promotion body 41 to the tip of the weft Y is not limited to heat welding, and an appropriate method such as a mechanical method can be adopted.

  Y ... Weft, 11A, 11B ... Main nozzle, 12A, 12B ... Tandem nozzle, 36 ... Weft cutter, 41 ... Flying promoter, 59 ... Splitting yarn.

Claims (7)

  A weft insertion method in an air jet loom, characterized in that the weft insertion is performed in a state in which a travel promoting body having a surface area per unit weight larger than that of the weft is attached to the front end of the weft before the weft insertion. .   An apparatus for attaching a weft run promoting body in an air jet loom, wherein a run promoting body having a surface area per unit weight larger than that of the weft is attached to a front end portion of the weft before weft insertion.   The apparatus for mounting a weft flying promoting body in an air jet loom according to claim 2, wherein the flying promoting body is in a tape shape.   The apparatus for mounting a weft flying promoting body in an air jet loom according to claim 2, wherein the flying promoting body is a split yarn.   5. The weft travel promoting body in an air jet loom according to claim 2, wherein the flying accelerating body is attached to a front end portion of the weft by thermal welding in a state where the weft is wrapped. Mounting device.   The installation of the weft travel promoting body in the air jet loom according to any one of claims 2 to 5, wherein the travel promoting body is attached to the weft yarn between a main nozzle and a weft cutter of the air jet loom. apparatus.   The installation of the weft travel promoting body in the air jet loom according to any one of claims 2 to 5, wherein the travel promoting body is attached to the weft between the tandem nozzle and the main nozzle of the air jet loom. apparatus.