JP2013060686A - Weft insertion device for air jet loom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a weft insertion device for an air jet loom, which enables high-speed weft insertion.SOLUTION: A first tandem nozzle 3A is fixedly arranged on the upstream side of a weft insertion nozzle 2A provided on a slay 6, and a second tandem nozzle 4A is fixedly arranged on the upstream side of the first tandem nozzle 3A at an interval. A weft braking device 7A is arranged between the first tandem nozzle 3A and the second tandem nozzle 4A. The first tandem nozzle 3A, the weft braking device 7A, and the second tandem nozzle 4A are integrally configured. An acceleration tube 23 of the first tandem nozzle 3A is formed to have a length longer than that of an acceleration tube 41 of the weft insertion nozzle 2A. An acceleration tube 27 of the second tandem nozzle 4A is formed to have a length shorter than that of the acceleration tube 41 of the weft insertion nozzle 2A. Thus, the weft driving force of the second tandem nozzle 4A is set to be smaller than that of the first tandem nozzle 3A, thereby enabling high-speed weft insertion in a fluid jet loom while suppressing increase in fluid consumption and increase in the installation area of a weft insertion device.

Description

  The present invention relates to a weft insertion device for an air jet loom that performs weft insertion using air.

  Patent Document 1 describes the weft insertion of an air-jet loom intended to stabilize the flying state of the weft yarn without changing the weft insertion condition of the main nozzle and to set the pressure lower than that of a single nozzle. An apparatus is disclosed. Specifically, an auxiliary nozzle is provided between the length measuring storage device and the main nozzle for weft insertion, and the air injection pressure and the injection period on the auxiliary nozzle side are changed according to the actual flying state of the weft yarn. . Thus, the weft conveying force can be indirectly and automatically adjusted while fixing the weft insertion condition of the main nozzle.

JP-A-1-280047

  In recent years, in the air jet looms, in order to increase productivity, there is a demand for looms capable of operating at a higher speed than before, for example, about 1000 revolutions (rpm). In general, the weft insertion speed can be increased by increasing the air pressure supplied to the main nozzle and auxiliary nozzle. However, if the air pressure is too high, the weft may be cut and the air consumption will increase. This causes problems such as increased costs. For this reason, in the weft insertion device provided with the main nozzle and the auxiliary nozzle as in the air jet loom disclosed in Patent Document 1, there is a limit in high-speed weft insertion, and it cannot sufficiently cope with it.

  In Patent Document 1, for the purpose of speeding up, for example, it may be possible to simply add the same auxiliary nozzle, but as it is, the air consumption increases or the installation area of the auxiliary nozzle increases, which is put into practical use. Problems arise. Further, in the air jet loom, a relatively large amount of threading work to the auxiliary nozzle occurs, but there are problems that the operability of the threading work is deteriorated due to an increase in the number of auxiliary nozzles. In addition, if the flow rate adjustment between the existing auxiliary nozzle and the additional auxiliary nozzle is not properly performed, the weft is loosened between the two auxiliary nozzles, which causes a problem that the weft is cut or damaged.

  The present invention provides a weft insertion device for an air jet loom that enables high-speed weft insertion.

  According to a first aspect of the present invention, there is provided a weft insertion device for an air-jet loom in which the weft drawn from the yarn supply unit and stored in the weft storage device is inserted by a weft insertion nozzle disposed on the sley. The first tandem nozzle is disposed upstream of the first tandem nozzle, and the second tandem nozzle is disposed upstream of the first tandem nozzle. The length of the accelerating tube of the second tandem nozzle is set to the length of the first tandem nozzle. It is characterized by being formed shorter than the length of the acceleration tube.

  According to the first aspect, it is possible to perform high-speed weft insertion of the air jet loom while suppressing an increase in air consumption and an increase in the installation area of the weft insertion device.

  According to a second aspect of the present invention, the inner diameter of the acceleration pipe of the second tandem nozzle is set smaller than the inner diameter of the acceleration pipe of the first tandem nozzle. According to the second aspect, by reducing the length and the inner diameter of the accelerating tube, the weft propulsion force of the second tandem nozzle can be further reduced, and the suppression of air consumption can be further increased. Moreover, the tension state of the weft yarn between the first tandem nozzle and the second tandem nozzle can be appropriately maintained, and weft loosening can be prevented.

  According to a third aspect of the present invention, a weft braking device is disposed between the first tandem nozzle and the second tandem nozzle, and the weft paths of the first tandem nozzle, the weft braking device, and the second tandem nozzle are on the same axis. It is characterized by being arranged on a line. According to the third aspect, since the weft tension at the installation position of the weft braking device is properly maintained, the flying weft can be reliably braked. Further, the threading of the weft thread from the second tandem nozzle to the weft braking device and the first tandem nozzle can be performed by a single operation, and the operability in the threading operation can be improved.

  According to a fourth aspect of the present invention, the weft braking device is fixed to the first tandem nozzle, and the weft introduction port of the first tandem nozzle and the weft injection port of the second tandem nozzle serve as the weft guide in the weft braking device. It is characterized by that. According to the fourth aspect, since the weft guide member of the weft braking device can be omitted, the weft braking device can be simplified and the weft threading operation is easy. In addition, the distance between the first tandem nozzle and the second tandem nozzle can be minimized to reduce the installation area of the weft insertion device.

  According to a fifth aspect of the present invention, the first tandem nozzle and the second tandem nozzle are connected by a connecting member and integrated. According to the fifth aspect, the first tandem nozzle and the second tandem nozzle can be unitized, and the installation operation of the weft insertion device can be facilitated. Further, in the configuration in which the weft braking device is fixed to the first tandem nozzle, the first tandem nozzle, the weft braking device and the second tandem nozzle can be set at the same time, so that the installation work of the weft insertion device can be performed more easily. it can.

  The present invention can realize the high-speed weft insertion of the weft insertion device, and can sufficiently cope with the high-speed operation of the air jet loom.

It is a conceptual diagram of the weft insertion apparatus explaining 1st Embodiment. It is a schematic plan view which shows a multicolor weft insertion apparatus. It is a top view which shows the 1st and 2nd tandem nozzle. It is a front view which shows the 1st and 2nd tandem nozzle. It is the schematic which shows the relationship between the weft insertion nozzle and the 1st and 2nd tandem nozzle. The operation of the weft braking device is shown, (A) is a schematic side view, (B) is a schematic front view. It is a schematic plan view which shows the weft braking device in 2nd Embodiment.

(First embodiment)
A first embodiment will be described with reference to FIGS. In the present specification, for the sake of convenience, the side opposite to the weft insertion direction of the weft will be described as upstream and the weft insertion direction as downstream. In FIG. 1, a weft insertion device 1 includes, as main parts, a weft insertion nozzle 2, a first tandem nozzle 3 disposed on the upstream side of the weft insertion nozzle 2, and an upstream side of the first tandem nozzle 3. The second tandem nozzle 4 and the auxiliary nozzle group 5 disposed on the downstream side of the weft insertion nozzle 2 are configured.

  The weft insertion nozzle 2 and the auxiliary nozzle group 5 are disposed on a slay 6 (see FIG. 2) and reciprocally swing in the front-rear direction of an air jet loom (air jet loom). The 1st tandem nozzle 3 and the 2nd tandem nozzle 4 are arrange | positioned in the state fixed to the bracket etc. which were attached to the flame | frame (not shown) or the floor (not shown) of an air jet loom. A weft braking device 7 is disposed between the first tandem nozzle 3 and the second tandem nozzle 4 to brake the weft Y to be inserted at a set timing.

  A switching valve 8 is connected to the weft insertion nozzle 2, a switching valve 9 is connected to the first tandem nozzle 3, and a switching valve 10 is connected to the second tandem nozzle 4 by a pipe 11. In the present specification, all other pipes connected to supply compressed air are also denoted by reference numeral 11 in other mechanisms. The switching valves 8 to 10 are connected to the main tank 12 by a common pipe 11. Moreover, each switching valve 8-10 can control the injection timing of the compressed air in the weft insertion nozzle 2, the first tandem nozzle 3, and the second tandem nozzle 4. The main tank 12 is connected by a pipe 11 with a filter 13, a pressure gauge 14, and a pressure adjustment valve 15 connected to a common air supply source (not shown) configured by a compressor or the like installed in the fabric factory. Store the supplied compressed air. The switching valves 8 to 10 are turned on and off according to the timing at the start of weft insertion and the timing at the end of weft insertion to supply and stop compressed air.

  On the other hand, the auxiliary nozzle group 5 has a plurality of switching valves 16 provided for each of a plurality of auxiliary nozzles, and each auxiliary nozzle is connected to each switching valve 16 by a pipe 11. Each switching valve 16 is connected to a common sub tank 17 by a pipe 11. The sub tank 17 is connected to the pipe 11 between the pressure adjusting valve 15 on the weft insertion nozzle 2 side and the pressure gauge 14 via the pressure adjusting valve 18 by the pipe 11 and supplied from an air supply source (not shown). Stores compressed air. Each switching valve 16 is relayed ON and OFF at a predetermined timing during weft insertion, and compressed air can be relay-injected from the auxiliary nozzle group 5.

  FIG. 2 shows a specific arrangement of the multi-color weft inserting devices 1A and 1B for alternately or randomly inserting two wefts Y1, Y2 of different types or the same type. Both the insertion devices 1A and 1B have the same configuration as the weft insertion device 1 shown in FIG. Since the weft insertion devices 1A and 1B have the same configuration, only the weft insertion device 1A is described in detail in FIGS. 3 to 6, and the description of the weft insertion device 1B is omitted.

  In FIG. 2, the weft insertion nozzle 2A of the weft insertion device 1A and the weft insertion nozzle 2B of the weft insertion device 1B are held in a form aligned in the front-rear direction of the air jet loom on one holder 19 mounted on the sley 6. ing. Further, the first tandem nozzle 3A, the weft thread braking device 7A and the second tandem nozzle 4A of the weft insertion device 1A provided in a state fixed to a stud (not shown) provided on the floor, and the weft insertion device 1B. The first tandem nozzle 3B, the weft yarn braking device 7B, and the second tandem nozzle 4B are arranged with their downstream end portions facing the weft insertion nozzles 2A and 2B.

  On the upstream side of the second tandem nozzle 4A, a weft supply portion 20A for the weft Y1, a weft storage device 21A, and a weft guide 22A are arranged in this order. Similarly, on the upstream side of the second tandem nozzle 4B, a weft supply portion 20B for the weft Y2, a weft storage device 21B, and a weft guide 22B are arranged in this order. Accordingly, the wefts Y1 and Y2 are drawn out from the yarn supplying units 20A and 20B, respectively, and stored in the weft storage devices 21A and 21B. The wefts Y1 and Y2 stored in the weft storage devices 21A and 21B are respectively introduced into the second tandem nozzles 4A and 4B through the weft guides 22A and 22B, and further through the weft brake devices 7A and 7B. 3A and 3B are introduced into the weft insertion nozzles 2A and 2B. The weft insertion nozzles 2A and 2B insert the wefts Y1 and Y2 into a warp opening (not shown) at set timings.

  3 to 6, the detailed configuration of the weft insertion device 1A excluding the weft insertion nozzle 2A will be described. As shown in FIGS. 3 and 4, the first tandem nozzle 3 </ b> A has an acceleration tube 23 on the downstream side and a weft introduction port 24 on the upstream side, and is held by a holder 25. The weft injection port 26 and the weft introduction port 24 provided at the tip of the acceleration tube 23 are made of ceramics in order to prevent wear due to contact with the weft Y. The second tandem nozzle 4 </ b> A provided at a certain distance upstream from the first tandem nozzle 3 </ b> A has an acceleration pipe 27 on the downstream side and a weft introduction port 28 on the upstream side, and is held by a holder 29. Further, the weft introduction port 28 and the weft injection port 30 of the acceleration tube 27 are made of ceramics as in the case of the first tandem nozzle 3A.

  A bracket 31 is fixed to the holder 25 of the first tandem nozzle 3 </ b> A by a bolt 32. The bracket 31 is provided with a weft guide 33 and a stepping motor 34 constituting the weft braking device 7A. The weft guide 33 is disposed substantially at the center between the weft introduction port 24 of the first tandem nozzle 3A and the weft injection port 30 of the acceleration pipe 27 of the second tandem nozzle 4A. The positional relationship among the first tandem nozzle 3A, the second tandem nozzle 4A and the weft guide 33 is arranged so as to be on the same axis X, and the weft path of the weft Y1 (see FIG. 2) is configured to be a straight line. ing.

  A rotation holder 37 having a brake lever 36 formed in a U shape is fixed to the motor shaft 35 of the stepping motor 34. The U-shaped portion of the brake lever 36 is disposed between the weft introduction port 24 and the weft guide 33 and between the weft injection port 30 and the weft guide 33. A stopper 43 attached to the bracket 31 is disposed above the brake lever 36. The stepping motor 34 rotates the rotary holder 37 and rotates the brake lever 36 in the vertical direction. Therefore, the brake lever 36 is always in the standby position (see the solid line position in FIG. 6) in contact with the stopper 43, and is actuated position rotated in the direction orthogonal to the same axis X when the stepping motor 34 is driven (see FIG. 6). 6). In addition, the weft introduction port 24 and the weft injection port 30 are configured to serve as both the upstream and downstream weft guides in the weft braking device 7A, and minimize the space required for installing the weft braking device 7A. Can do.

  The holder 25 of the first tandem nozzle 3 </ b> A and the holder 29 of the second tandem nozzle 4 </ b> A are connected and integrated by coupling members 38 and 39 arranged in two vertical directions (see FIG. 4). By the coupling members 38 and 39, the first tandem nozzle 3A, the weft guide 33 of the weft braking device 7A, and the second tandem nozzle 4A can be accurately arranged on the same axis X. Since the first tandem nozzle 3A, the weft yarn braking device 7A and the second tandem nozzle 4A can be unitized, the weft insertion device 1A can be easily and accurately installed on the air jet loom.

  In FIG. 5, the difference in structure between the weft insertion nozzle 2A, the first tandem nozzle 3A, and the second tandem nozzle 4A will be described. The weft insertion nozzle 2A includes a weft introduction port 40 and an acceleration tube 41, and the weft introduction port 40 and the weft injection port 42 at the tip of the acceleration tube 41 are similar to the first tandem nozzle 3A and the second tandem nozzle 4A. It is made of ceramics.

  The length L1 of the acceleration pipe 41 in the weft insertion nozzle 2A and the length L2 of the acceleration pipe 23 in the first tandem nozzle 3A are formed so that L1 <L2, and the length L1 of the acceleration pipe 41 in the weft insertion nozzle 2A. The length L3 of the acceleration tube 27 in the second tandem nozzle 4A is formed so that L1> L3. As a result, the length L3 of the acceleration tube 27 in the second tandem nozzle 4A is the first tandem nozzle 4A. It is shorter than the length L2 of the acceleration tube 23 in 3A. By forming the length L3 of the accelerating tube 27 in the second tandem nozzle 4A to be short, even in the case of compressed air supplied from the same main tank 12 (see FIG. 1), the weft driving force in the second tandem nozzle 4A Can be made smaller than the weft insertion nozzle 2A and the first tandem nozzle 3A. The length L2 of the acceleration tube 23 in the first tandem nozzle 3A may be equal to or shorter than the length L1 of the acceleration tube 41 in the weft insertion nozzle 2A.

  Therefore, air consumption is suppressed and excessive supply of the weft Y1 to the weft introduction port 24 of the first tandem nozzle 3A is suppressed. Suppressing the excessive supply of the weft Y1 can prevent the weft Y1 from loosening between the first tandem nozzle 3A and the second tandem nozzle 4A, and can maintain a proper tension state of the weft Y1 for smooth conveyance. Enable. The second tandem nozzle 4A has a function of withdrawing the weft Y1 from the weft storage device 21A. In order to eliminate the resistance to drawing out the weft Y1 in the weft storage device 21A, the load on the first tandem nozzle 3A and the weft insertion nozzle 2A It can reduce and it can contribute to suppression of air consumption. Further, the shortening of the acceleration pipe 27 in the second tandem nozzle 4A can suppress an increase in the installation area of the weft insertion device 1A.

  Further, the inner diameter D1 of the acceleration pipe 41 in the weft insertion nozzle 2A and the inner diameter D2 of the acceleration pipe 23 in the first tandem nozzle 3A are formed to have the same diameter or an approximate diameter, and the inner diameter D2 of the acceleration pipe 23 in the first tandem nozzle 3A. The inner diameter D3 of the acceleration tube 27 in the second tandem nozzle 4A is formed so as to satisfy D2> D3. The reduction in the inner diameter D3 of the accelerating tube 27 makes it easy to set the weft propulsion force in the second tandem nozzle 4A to a smaller optimum value in combination with the shortening of the accelerating tube 27.

  In FIG. 6, the details of the operation of the weft braking device 7A will be described. When the brake lever 36 is not operated, the brake lever 36 stands by in a state where it is in contact with the stopper 43 at a position indicated by a solid line in FIGS. When the stepping motor 34 (see FIG. 3) is driven at the set timing during weft insertion, the brake lever 36 rotates to the virtual line position, and the weft introduction port 24 of the first tandem nozzle 3A and the second tandem. The weft Y1 between the nozzle 4A and the weft injection port 30 is pushed down. For this reason, the flying weft Y1 is bent in a W shape between the weft guide 33 and the weft introduction port 24 and between the weft guide 33 and the weft injection port 30 as indicated by phantom lines ( (See FIG. 6 (B)).

In the first embodiment configured as described above, weft insertion is performed as follows.
When weft insertion of the weft Y1 is selected during the weaving operation of the air jet loom, the weft insertion nozzle 2A, the first tandem nozzle 3A and the second tandem nozzle 4A are set by the operation of each switching valve 8-10. At the timing, injection of compressed air is started. In the weft storage device 21A, when a weft locking pin (not shown) releases the weft Y1, the stored weft Y1 is drawn out by the second tandem nozzle 4A. The second tandem nozzle 4A is responsible for most of the load related to the pull-out resistance of the weft Y1 in the weft storage device 21A, and the transport force of the weft Y1 is smaller than that of the first tandem nozzle 3A.

  Since the first tandem nozzle 3A does not need to counter the pull-out resistance of the weft Y1 in the weft storage device 21A, most of the weft propulsion force can be spent on conveying the weft Y1. Accordingly, the weft Y1 drawn by the second tandem nozzle 4A is conveyed to the weft insertion nozzle 2A by the large propulsive force of the compressed air focused by the acceleration pipe 23 of the first tandem nozzle 3A. The weft Y1 ejected from the first tandem nozzle 3A is further inserted into a warp opening (not shown) by the weft propulsion force of the weft insertion nozzle 2A. Accordingly, since the weft propulsion force of the first tandem nozzle 3A and the weft insertion nozzle 2A is jointly spent for transporting the weft Y1, it is possible to enable high-speed weft insertion in the air jet loom.

  In the air jet loom, when the weft Y1 is cut or when a new fabric is set, the weft Y1 needs to be threaded into the weft insertion device 1A. In the present embodiment, the weft paths in the first tandem nozzle 3A, the weft braking device 7A, and the second tandem nozzle 4A are arranged on the same axis X. Therefore, if the operator brings the end of the weft Y1 close to the weft introduction port 28 of the second tandem nozzle 4A and supplies compressed air to the second tandem nozzle 4A, the weft Y1 passes through the straight weft path, It reaches the weft injection port 26 of the tandem nozzle 3A. Accordingly, the threading operation from the second tandem nozzle 4A to the first tandem nozzle 3A can be performed by a single operation, and the operability of the threading operation can be improved. For the weft Y1 that has reached the weft injection port 26 of the first tandem nozzle 3A, the operator brings the weft Y1 close to the weft introduction port 40 of the weft insertion nozzle 2A and supplies compressed air to the weft insertion nozzle 2A. The weft insertion nozzle 2A can be threaded, and the entire thread insertion device 1A is threaded.

(Second Embodiment)
In the second embodiment shown in FIG. 7, the arrangement position of the weft braking device 7A in the first embodiment is changed, and the same components as those in the first embodiment are denoted by the same reference numerals. Detailed description is omitted. In the second embodiment, a weft braking device 44A is installed on the upstream side of the second tandem nozzle 4A. A bracket 45 serving as a support member of the weft braking device 44A is fixed to the holder 29 of the second tandem nozzle 4A by a bolt 46, and an L-shaped bracket 47 is fixed to the bracket 45 by a bolt 48. A bracket is formed.

  A stepping motor 49 constituting a weft braking device 44A is fixed to the bracket 45 by means such as a bolt (not shown), a stopper 50 is fixed by a bolt 51, and a weft disposed upstream of the second tandem nozzle 4A. The guide 52 is fixed via a support member (not shown). A rotation holder 55 having a U-shaped brake lever 54 is fixed to the motor shaft 53 of the stepping motor 49. The stepping motor 49 is driven at a set timing during weft insertion, and the brake lever 54 is rotated from the upper standby position regulated by the stopper 50 to the lower operation position across the weft guide 52 and the weft Y is moved. Braking.

  A threading nozzle 56 is fixed to the L-shaped bracket 47 so as to be located upstream of the weft guide 52. The threading nozzle 56 includes a downstream air injection port 57 and an upstream weft introduction port 58, and both the air injection port 57 and the weft introduction port 58 are made of ceramic. Further, the piping 11 is connected to the threading nozzle 56, and compressed air can be supplied from the main tank 12 shown in FIG. 1 via a switching valve (not shown).

  The weft paths in the second tandem nozzle 4A, the weft braking device 44A and the threading nozzle 56 are arranged on the same axis X. Therefore, if the weft Y1 is brought close to the weft introduction port 58 of the threading nozzle 56 and compressed air is supplied from the pipe 11 to the threading nozzle 56, the weft braking device 44A and the second tandem nozzle 4A can be easily threaded. Can do. Further, since the weft introduction port 58 of the second tandem nozzle 4A and the air injection port 57 of the threading nozzle 56 are used as weft guides necessary on the upstream side and the downstream side of the weft brake device 44A, the weft brake device 44A. The installation area can be minimized. Further, since the second tandem nozzle 4A, the weft braking device 44A and the threading nozzle 56 are integrated by the bracket 45 and the L-shaped bracket 47, the centering and installation work on the same axis X is easy. .

  If the first tandem nozzle 3A not shown in FIG. 7 is arranged on the same axis X, the threading of the weft insertion device excluding the weft insertion nozzle 2A (see FIG. 2) is completed by one operation. be able to. In the second embodiment, the weft braking device 44A and the threading nozzle 56 can be separated from the second tandem nozzle 4A and installed independently.

  The present invention is not limited to the configuration of each of the embodiments described above, and various modifications are possible within the scope of the gist of the present invention, and can be implemented as follows.

(1) In the first embodiment, the weft braking devices 7, 7A, 7B are separated from the first tandem nozzles 3, 3A, 3B, and the first tandem nozzles 3, 3A, 3B and the second tandem nozzles 4, 4A, You may comprise so that it may install independently between 4B. In addition to the first tandem nozzles 3, 3A, 3B and the second tandem nozzles 4, 4A, 4B, dedicated weft guides may be provided upstream and downstream of the weft braking devices 7, 7A, 7B.
(2) The weft paths in the first tandem nozzles 3, 3A, 3B, the weft braking devices 7, 7A, 7B and the second tandem nozzles 4, 4A, 4B are not necessarily arranged on the same axis X, and the weft paths May be arranged in a bent state.

(3) In the first embodiment, the acceleration pipe 41 of the weft insertion nozzles 2, 2A, 2B and the acceleration pipe 23 of the first tandem nozzles 3, 3A, 3B use straight pipes each having a constant inner diameter. Alternatively, either one or both of the acceleration tube 41 and the acceleration tube 23 may be a trumpet tube whose inner diameter increases toward the downstream side so that the weft propulsion force of the compressed air is further increased.
(4) In the first embodiment, each switching valve 8-10 shown in FIG. 1 is changed to one switching valve, and weft insertion nozzles 2, 2A, 2B, first tandem nozzles 3, 3A, 3B, and The injection of compressed air in the second tandem nozzles 4, 4A, 4B may be controlled at the same timing.

(5) The stepping motors 34 and 49 shown in the first and second embodiments can be replaced with servo motors or other motors capable of rotation control.

1, 1A, 1B Weft insertion device 2, 2A, 2B Weft insertion nozzle 3, 3A, 3B First tandem nozzle 4, 4A, 4B Second tandem nozzle 5 Auxiliary nozzle groups 7, 7A, 7B, 44A Weft braking device 20A, 20B Yarn supply section 21A, 21B Weft storage device 23, 27, 41 Acceleration pipes 24, 28, 40, 58 Weft introduction port 26, 30, 42 Weft injection port 33, 52 Weft guide 34, 49 Stepping motor 36, 54 Brake lever 38, 39 Connecting member 43, 50 Stopper 56 Threading nozzle 57 Air injection port D1, D2, D3 Accelerating pipe inner diameter L1, L2, L3 Accelerating pipe length X Coaxial axis Y, Y1, Y2 Weft

Claims (5)

In the weft insertion device of the air-jet loom, in which the wefts drawn out from the yarn supply unit and stored in the weft storage device are inserted by a weft insertion nozzle disposed on the sley,
A first tandem nozzle is disposed upstream of the weft insertion nozzle, a second tandem nozzle is disposed upstream of the first tandem nozzle, and the length of the acceleration pipe of the second tandem nozzle is set to the first tandem nozzle. A weft insertion device for an air-jet loom characterized by being formed shorter than the length of an acceleration pipe of one tandem nozzle.   The weft insertion device for an air-jet loom according to claim 1, wherein an inner diameter of the acceleration pipe of the second tandem nozzle is set smaller than an inner diameter of the acceleration pipe of the first tandem nozzle.   A weft braking device is disposed between the first tandem nozzle and the second tandem nozzle, and the weft paths of the first tandem nozzle, the weft braking device, and the second tandem nozzle are disposed on the same axis. The weft insertion device for an air-jet loom according to claim 1 or 2.   The weft braking device is fixed to the first tandem nozzle, and the weft introduction port of the first tandem nozzle and the weft injection port of the second tandem nozzle are used as a weft guide in the weft braking device. The weft insertion device for an air jet loom according to claim 3.   The weft insertion device for an air-jet loom according to any one of claims 1 to 4, wherein the first tandem nozzle and the second tandem nozzle are connected and integrated by a coupling member.

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